/**
 * ╔══════════════════════════════════════════════════════════════════════════════╗
 * ║                     ROX AI - STYLESHEET                                       ║
 * ║                     Version 3.9.2                                             ║
 * ╠══════════════════════════════════════════════════════════════════════════════╣
 * ║                                                                               ║
 * ║                            TABLE OF CONTENTS                                  ║
 * ║                                                                               ║
 * ║  SECTION                                              LINE (approx)          ║
 * ║  ───────────────────────────────────────────────────────────────────────     ║
 * ║                                                                               ║
 * ║  1. PERFORMANCE & BASE STYLES .......................... ~100                 ║
 * ║     - Performance optimizations                                               ║
 * ║     - Source protection (user-select)                                         ║
 * ║     - GPU acceleration hints                                                  ║
 * ║     - Reduced motion support                                                  ║
 * ║     - Text selection styles                                                   ║
 * ║                                                                               ║
 * ║  2. CSS VARIABLES & THEMES ............................. ~150                 ║
 * ║     - :root variables (dark theme default)                                    ║
 * ║     - Light theme media query                                                 ║
 * ║     - [data-theme="dark"] overrides                                           ║
 * ║     - [data-theme="light"] overrides                                          ║
 * ║                                                                               ║
 * ║  3. LIGHT THEME ENHANCEMENTS ........................... ~250                 ║
 * ║     - Component-specific light theme styles                                   ║
 * ║     - Gradients and shadows for light mode                                    ║
 * ║                                                                               ║
 * ║  4. SCROLLBAR STYLES ................................... ~500                 ║
 * ║     - Webkit scrollbar                                                        ║
 * ║     - Firefox scrollbar                                                       ║
 * ║                                                                               ║
 * ║  5. LOADING SCREEN ..................................... ~550                 ║
 * ║     - Loading screen styles                                                   ║
 * ║     - Mobile loading screen                                                   ║
 * ║                                                                               ║
 * ║  6. APP LAYOUT ......................................... ~600                 ║
 * ║     - .app container                                                          ║
 * ║     - Flexbox layout                                                          ║
 * ║                                                                               ║
 * ║  7. SIDEBAR ............................................ ~620                 ║
 * ║     - Sidebar container                                                       ║
 * ║     - Sidebar header                                                          ║
 * ║     - New chat button                                                         ║
 * ║     - Chat list                                                               ║
 * ║     - Chat items                                                              ║
 * ║     - Sidebar footer                                                          ║
 * ║     - Version display                                                         ║
 * ║     - User menu                                                               ║
 * ║                                                                               ║
 * ║  7a. UPDATE DIALOG ..................................... ~850                 ║
 * ║     - Update dialog overlay                                                   ║
 * ║     - Version badges (current/new)                                            ║
 * ║     - Update dialog buttons                                                   ║
 * ║     - Update animations                                                       ║
 * ║                                                                               ║
 * ║  8. MAIN CONTENT AREA .................................. ~1000                ║
 * ║     - Main container                                                          ║
 * ║     - Header                                                                  ║
 * ║     - Header actions                                                          ║
 * ║     - Download/Install button                                                 ║
 * ║                                                                               ║
 * ║  9. CHAT CONTAINER ..................................... ~1150                ║
 * ║     - Chat container scrolling                                                ║
 * ║     - Welcome screen                                                          ║
 * ║     - Logo animations                                                         ║
 * ║     - Suggestion cards                                                        ║
 * ║                                                                               ║
 * ║  10. MESSAGES .......................................... ~1300                ║
 * ║      - Message container                                                      ║
 * ║      - Message bubbles                                                        ║
 * ║      - Message avatars                                                        ║
 * ║      - AI logo avatar                                                         ║
 * ║      - Model indicator                                                        ║
 * ║      - Message actions (copy, regenerate, etc.)                               ║
 * ║      - Listen aloud button                                                    ║
 * ║      - Edit button                                                            ║
 * ║                                                                               ║
 * ║  11. MESSAGE CONTENT TYPOGRAPHY ........................ ~1600                ║
 * ║      - Paragraphs, headings                                                   ║
 * ║      - Lists (ordered, unordered)                                             ║
 * ║      - Blockquotes                                                            ║
 * ║      - Inline code                                                            ║
 * ║      - Links                                                                  ║
 * ║      - Math blocks                                                            ║
 * ║                                                                               ║
 * ║  12. INPUT AREA ........................................ ~2600                ║
 * ║      - Input container                                                        ║
 * ║      - Textarea                                                               ║
 * ║      - Attach button                                                          ║
 * ║      - Send button                                                            ║
 * ║      - Attachments preview                                                    ║
 * ║                                                                               ║
 * ║  13. MICRO-INTERACTIONS ................................ ~2900                ║
 * ║      - Button active states                                                   ║
 * ║      - Hover effects                                                          ║
 * ║                                                                               ║
 * ║  14. MOBILE RESPONSIVE (ChatGPT-Style) ................. ~3200                ║
 * ║      - Mobile breakpoint styles                                               ║
 * ║      - Touch-friendly sizing                                                  ║
 * ║      - Mobile sidebar                                                         ║
 * ║      - Mobile input area                                                      ║
 * ║                                                                               ║
 * ║  15. CODE BLOCKS ....................................... ~4000                ║
 * ║      - Code block container                                                   ║
 * ║      - Code header                                                            ║
 * ║      - Copy button                                                            ║
 * ║      - Syntax highlighting                                                    ║
 * ║      - Streaming code blocks                                                  ║
 * ║                                                                               ║
 * ║  16. DIALOGS & MODALS .................................. ~4200                ║
 * ║      - Custom dialog overlay                                                  ║
 * ║      - Dialog content                                                         ║
 * ║      - Dialog buttons                                                         ║
 * ║      - Dialog animations                                                      ║
 * ║                                                                               ║
 * ║  17. TOAST NOTIFICATIONS ............................... ~4350                ║
 * ║      - Toast container                                                        ║
 * ║      - Toast types (success, error, warning, info)                            ║
 * ║      - Toast animations                                                       ║
 * ║                                                                               ║
 * ║  18. ANIMATIONS ........................................ ~4400                ║
 * ║      - Keyframe animations                                                    ║
 * ║      - fadeInUp, scaleIn, scaleOut                                            ║
 * ║      - bounceIn, slideIn                                                      ║
 * ║                                                                               ║
 * ║  19. MODEL SELECTOR DROPDOWN ........................... ~4650                ║
 * ║      - Dropdown button                                                        ║
 * ║      - Dropdown menu                                                          ║
 * ║      - Model options                                                          ║
 * ║                                                                               ║
 * ║  20. VERSION NAVIGATION ................................ ~4900                ║
 * ║      - Version nav container                                                  ║
 * ║      - Version buttons                                                        ║
 * ║                                                                               ║
 * ║  21. EDIT MODAL ........................................ ~4950                ║
 * ║      - Edit modal styles                                                      ║
 * ║      - Mobile responsive                                                      ║
 * ║                                                                               ║
 * ║  22. PWA & MOBILE NAVIGATION ........................... ~4900                ║
 * ║      - PWA standalone mode                                                    ║
 * ║      - Native-like gestures                                                   ║
 * ║      - Android back button support                                            ║
 * ║      - iOS swipe navigation                                                   ║
 * ║      - Pull-to-refresh prevention                                             ║
 * ║      - Safe area insets                                                       ║
 * ║      - Home indicator area                                                    ║
 * ║                                                                               ║
 * ║  23. MOBILE ACTION SHEET ............................... ~5150                ║
 * ║      - iOS-style action sheet                                                 ║
 * ║      - Action sheet items                                                     ║
 * ║      - Long-press feedback                                                    ║
 * ║                                                                               ║
 * ║  24. NAVIGATION TRANSITIONS ............................ ~5300                ║
 * ║      - Page transitions                                                       ║
 * ║      - Slide animations                                                       ║
 * ║                                                                               ║
 * ║  25. TOUCH & SCROLL OPTIMIZATIONS ...................... ~5400                ║
 * ║      - Rubber band scrolling                                                  ║
 * ║      - Touch highlight removal                                                ║
 * ║      - Momentum scrolling                                                     ║
 * ║      - Keyboard handling                                                      ║
 * ║                                                                               ║
 * ║  26. DEVICE-SPECIFIC STYLES ............................ ~5450                ║
 * ║      - Notch/Dynamic Island support                                           ║
 * ║      - Android Material ripple                                                ║
 * ║      - Status bar styles                                                      ║
 * ║                                                                               ║
 * ║  27. ACCESSIBILITY ..................................... ~5650                ║
 * ║      - Focus visible                                                          ║
 * ║      - Reduced motion                                                         ║
 * ║      - Text selection                                                         ║
 * ║                                                                               ║
 * ║  28. STREAMING STYLES .................................. ~5700                ║
 * ║      - Streaming code blocks                                                  ║
 * ║      - Streaming indicators                                                   ║
 * ║      - Cursor animations                                                      ║
 * ║                                                                               ║
 * ║  29. TABLES ............................................ ~5900                ║
 * ║      - Markdown tables                                                        ║
 * ║      - Table wrapper                                                          ║
 * ║      - Streaming tables                                                       ║
 * ║                                                                               ║
 * ║  30. CHARTS ............................................ ~6000                ║
 * ║      - Chart containers                                                       ║
 * ║      - Bar charts, pie charts                                                 ║
 * ║      - Streaming charts                                                       ║
 * ║                                                                               ║
 * ║  31. DOCUMENTATION MODAL ............................... ~6200                ║
 * ║      - Docs modal overlay                                                     ║
 * ║      - Docs content                                                           ║
 * ║      - Model cards                                                            ║
 * ║                                                                               ║
 * ║  32. CONTEXT MENU ...................................... ~6400                ║
 * ║      - Context menu styles                                                    ║
 * ║      - Menu items                                                             ║
 * ║                                                                               ║
 * ╚══════════════════════════════════════════════════════════════════════════════╝
 * 
 * USAGE: Use Ctrl+F (Cmd+F on Mac) to search for section headers like:
 *        "/* ===== MESSAGES =====" 
 *        to jump directly to that section.
 */

/* ===== PERFORMANCE & BASE STYLES ===== */

/* Performance Optimizations */
html {
    scroll-behavior: auto; /* Disable smooth scroll globally for better performance */
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Source Protection - Disable selection on UI elements */
.sidebar,
.header,
.sidebar-header,
.sidebar-footer,
.btn-new-chat,
.chat-item,
.model-selector,
.welcome,
.suggestion-card,
.input-area,
.logo-container {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Allow selection only in message content and input */
.message-content,
.message-input,
textarea,
input[type="text"] {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
}

/* GPU acceleration hints for animated elements */
.sidebar,
.message,
.toast,
.custom-dialog,
.model-dropdown,
.context-menu,
.modal {
    will-change: transform, opacity;
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Custom Text Selection - Professional Dark Style */
::selection {
    background: rgba(62, 180, 137, 0.3);
    color: inherit;
}

::-moz-selection {
    background: rgba(62, 180, 137, 0.3);
    color: inherit;
}

/* Code block selection */
.code-block ::selection {
    background: rgba(255, 255, 255, 0.2);
    color: inherit;
}

.code-block ::-moz-selection {
    background: rgba(255, 255, 255, 0.2);
    color: inherit;
}

/* Variables - Dark Theme (Default) */
:root {
    --bg-primary: #0f1a24;
    --bg-secondary: #152232;
    --bg-tertiary: #1a2b3c;
    --bg-elevated: #1e3347;
    --bg-hover: #243d52;
    --text-primary: #ffffff;
    --text-secondary: #a0b4c4;
    --text-tertiary: #6b8599;
    --border: #2a3f52;
    --accent: #3eb489;
    --accent-hover: #35a07a;
    --accent-secondary: #d97bb3;
    --user-bubble: #3d4f5f;
    --user-avatar: #d97bb3;
    --ai-avatar: #3eb489;
    --success: #3eb489;
    --error: #ef4444;
    --warning: #f59e0b;
    --sidebar-width: 260px;
    --header-height: 56px;
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme */
@media (prefers-color-scheme: light) {
    :root {
        --bg-primary: #f8fafc;
        --bg-secondary: #ffffff;
        --bg-tertiary: #f1f5f9;
        --bg-elevated: #ffffff;
        --bg-hover: #e2e8f0;
        --text-primary: #0f172a;
        --text-secondary: #475569;
        --text-tertiary: #94a3b8;
        --border: #e2e8f0;
        --accent: #10b981;
        --accent-hover: #059669;
        --accent-secondary: #ec4899;
        --user-bubble: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        --user-bubble-solid: #667eea;
        --user-avatar: #ec4899;
        --ai-avatar: #10b981;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    }
}

/* Manual theme toggle classes */
[data-theme="dark"] {
    --bg-primary: #0f1a24;
    --bg-secondary: #152232;
    --bg-tertiary: #1a2b3c;
    --bg-elevated: #1e3347;
    --bg-hover: #243d52;
    --text-primary: #ffffff;
    --text-secondary: #a0b4c4;
    --text-tertiary: #6b8599;
    --border: #2a3f52;
    --accent: #3eb489;
    --accent-hover: #35a07a;
    --accent-secondary: #d97bb3;
    --user-bubble: #3d4f5f;
    --user-bubble-solid: #3d4f5f;
    --user-avatar: #d97bb3;
    --ai-avatar: #3eb489;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-elevated: #ffffff;
    --bg-hover: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border: #e2e8f0;
    --accent: #10b981;
    --accent-hover: #059669;
    --accent-secondary: #ec4899;
    --user-bubble: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --user-bubble-solid: #667eea;
    --user-avatar: #ec4899;
    --ai-avatar: #10b981;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ===== Light Theme Specific Enhancements ===== */
[data-theme="light"] body {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

[data-theme="light"] .sidebar {
    background: #ffffff;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .header {
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    position: relative;
    z-index: 100;
}

[data-theme="light"] .btn-new-chat {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    border: none;
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

[data-theme="light"] .btn-new-chat:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
    transform: translateY(-1px);
}

[data-theme="light"] .chat-item {
    border-radius: 12px;
    transition: all 0.2s ease;
}

[data-theme="light"] .chat-item:hover {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
}

[data-theme="light"] .chat-item.active {
    background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
    border: 1px solid #10b981;
}

[data-theme="light"] .message.user .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 14px rgba(102, 126, 234, 0.3);
}

[data-theme="light"] .message.user .message-avatar {
    background: linear-gradient(135deg, #ec4899 0%, #db2777 100%);
    box-shadow: 0 4px 14px rgba(236, 72, 153, 0.3);
}

[data-theme="light"] .message.assistant .message-avatar {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

[data-theme="light"] .input-container {
    background: #ffffff;
    border: 2px solid #e2e8f0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .input-container:focus-within {
    border-color: #10b981;
    box-shadow: 0 4px 20px rgba(16, 185, 129, 0.15), 0 0 0 4px rgba(16, 185, 129, 0.1);
}

[data-theme="light"] .btn-send {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

[data-theme="light"] .btn-send:hover:not(:disabled) {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

[data-theme="light"] .btn-send.generating {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    box-shadow: 0 4px 14px rgba(239, 68, 68, 0.3);
}

[data-theme="light"] .btn-send.generating:hover {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

[data-theme="light"] .code-block {
    background: #1e293b;
    border: 1px solid #334155;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .code-header {
    background: #0f172a;
}

[data-theme="light"] .model-selector {
    position: relative;
    z-index: 1000;
}

/* Light theme model selector styles are now consolidated in the main model selector section */

[data-theme="light"] .toast {
    background: #ffffff;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .custom-dialog {
    background: #ffffff;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .dialog-btn-primary {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

[data-theme="light"] .dialog-btn-primary:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

[data-theme="light"] .msg-action-btn {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .msg-action-btn:hover {
    background: #f1f5f9;
    border-color: #10b981;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.15);
}

[data-theme="light"] .msg-edit-btn {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .msg-edit-btn:hover {
    background: #f1f5f9;
    border-color: #667eea;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
}

[data-theme="light"] .version-nav {
    background: transparent;
    border: none;
    border-top: 1px solid #e2e8f0;
    box-shadow: none;
}

[data-theme="light"] .version-btn {
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
    color: #475569;
}

[data-theme="light"] .version-btn:hover:not(:disabled) {
    background: #10b981;
    border-color: #10b981;
    color: white;
}

[data-theme="light"] .attachment-item {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .attachment-preview {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .welcome h2 {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

[data-theme="light"] .btn-icon {
    color: #475569;
}

[data-theme="light"] .btn-icon:hover {
    background: #f1f5f9;
    color: #0f172a;
}

[data-theme="light"] ::selection {
    background: rgba(16, 185, 129, 0.3);
    color: inherit;
}

[data-theme="light"] ::-moz-selection {
    background: rgba(16, 185, 129, 0.3);
    color: inherit;
}

[data-theme="light"] .message.assistant .message-content :not(pre) > code {
    background: #f1f5f9;
    color: #475569;
    border: 1px solid #e2e8f0;
}

[data-theme="light"] .chat-container {
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
}

[data-theme="light"] .sidebar-footer {
    background: linear-gradient(180deg, transparent 0%, rgba(241, 245, 249, 0.8) 100%);
}

[data-theme="light"] .user-menu {
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
}

[data-theme="light"] .user-menu:hover {
    background: #e2e8f0;
}

/* ===== Custom Scrollbar Styles ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

[data-theme="light"] ::-webkit-scrollbar-thumb {
    background: #cbd5e1;
}

[data-theme="light"] ::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* Firefox scrollbar */
html {
    scrollbar-width: thin;
    scrollbar-color: var(--text-tertiary) transparent;
}

[data-theme="light"] html {
    scrollbar-color: #cbd5e1 transparent;
}

/* ===== Light Theme Loading Screen ===== */
[data-theme="light"] #loading-screen {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

[data-theme="light"] .loading-spinner {
    border-color: rgba(16, 185, 129, 0.2);
    border-top-color: #10b981;
}

/* ===== Mobile Loading Screen ===== */
@media (max-width: 768px) {
    #loading-screen {
        padding: env(safe-area-inset-top, 0) env(safe-area-inset-right, 0) env(safe-area-inset-bottom, 0) env(safe-area-inset-left, 0);
    }
    
    .loading-logo svg {
        width: 64px;
        height: 64px;
    }
    
    .loading-text {
        font-size: 13px;
        letter-spacing: 1.5px;
    }
}

/* ===== APP LAYOUT ===== */

.app {
    display: flex;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    position: relative;
}

/* ===== SIDEBAR ===== */

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: transform 0.25s ease-out, margin-left 0.25s ease-out;
    flex-shrink: 0;
}

.sidebar.collapsed {
    margin-left: calc(-1 * var(--sidebar-width));
}

.sidebar-header {
    padding: 12px;
    border-bottom: 1px solid var(--border);
}

.btn-new-chat {
    width: 100%;
    padding: 10px 12px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s var(--ease-in-out);
}

.btn-new-chat:hover {
    background: var(--bg-hover);
}

.btn-new-chat:active {
    transform: scale(0.98);
}

.chat-list {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 8px;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    scroll-behavior: smooth;
}

.chat-item {
    padding: 10px 12px;
    margin-bottom: 4px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    transition: all 0.1s ease;
    position: relative;
    -webkit-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.chat-item:active {
    transform: scale(0.98);
    background: var(--bg-hover);
}

.chat-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.chat-item.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.chat-item-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chat-item-menu {
    opacity: 0;
    padding: 4px;
    border-radius: 4px;
    transition: opacity 0.15s;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-item:hover .chat-item-menu {
    opacity: 1;
}

.chat-item-menu:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--border);
}

/* ==================== VERSION DISPLAY ==================== */
.app-version-display {
    padding: 8px 12px;
    font-size: 11px;
    color: var(--text-tertiary);
    text-align: center;
    border-bottom: 1px solid var(--border);
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    letter-spacing: 0.5px;
    cursor: default;
    -webkit-user-select: none;
    user-select: none;
    transition: color 0.2s ease;
}

.app-version-display:hover {
    color: var(--text-secondary);
}

/* ==================== UPDATE DIALOG ==================== */
.update-dialog-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100000;
    animation: updateFadeIn 0.2s ease-out;
}

.update-dialog {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 32px;
    max-width: 420px;
    width: 90%;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: updateSlideUp 0.3s ease-out;
}

.update-dialog-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.update-dialog-title {
    color: var(--text-primary);
    font-size: 20px;
    font-weight: 600;
    margin: 0 0 16px;
}

.update-dialog-version {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin: 0 0 16px;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: 12px;
}

.version-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 8px 16px;
    border-radius: 8px;
    min-width: 80px;
}

.version-badge.current {
    background: rgba(148, 163, 184, 0.1);
    border: 1px solid rgba(148, 163, 184, 0.2);
}

.version-badge.new {
    background: rgba(102, 126, 234, 0.15);
    border: 1px solid rgba(102, 126, 234, 0.3);
}

.version-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
}

.version-badge.new .version-label {
    color: #667eea;
}

.version-number {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

.version-badge.new .version-number {
    color: #667eea;
}

.version-arrow {
    color: var(--text-tertiary);
    animation: versionArrowPulse 1.5s ease-in-out infinite;
}

.update-dialog-message {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    margin: 0 0 24px;
}

.update-dialog-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.update-dialog-btn {
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.update-dialog-btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.update-dialog-btn-secondary:hover {
    background: var(--bg-hover);
}

.update-dialog-btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.update-dialog-btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

@keyframes updateFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes updateSlideUp {
    from { opacity: 0; transform: translateY(20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes versionArrowPulse {
    0%, 100% { opacity: 0.5; transform: translateX(0); }
    50% { opacity: 1; transform: translateX(3px); }
}

@keyframes updateSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.user-menu {
    width: 100%;
    padding: 8px 10px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.2s var(--ease-in-out);
}

.user-menu:hover {
    background: var(--bg-hover);
    border-color: var(--border);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--user-avatar);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 13px;
    color: white;
}

.user-name {
    flex: 1;
    font-weight: 500;
}

/* ===== MAIN CONTENT AREA ===== */

/* Main Content */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.header {
    height: var(--header-height);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 12px;
    position: relative;
    z-index: 100;
}

.btn-toggle-sidebar {
    padding: 8px;
    background: transparent;
    border: none;
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-toggle-sidebar:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-toggle-sidebar:active {
    background: var(--bg-hover);
    transform: scale(0.95);
}

.header-title {
    flex: 1;
}

.header-title h1 {
    font-size: 16px;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

/* Install App / Download Button */
.btn-download {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.btn-download:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    background: linear-gradient(135deg, #5a6fd6 0%, #6a4190 100%);
}

.btn-download:active {
    transform: translateY(0);
}

.btn-download svg {
    width: 16px;
    height: 16px;
}

.btn-download .download-text {
    white-space: nowrap;
}

/* Hide install button on mobile/tablet - only show on desktop */
@media (max-width: 768px) {
    .btn-download {
        display: none !important;
    }
}

[data-theme="light"] .btn-download {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

[data-theme="light"] .btn-download:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.btn-icon {
    padding: 8px;
    background: transparent;
    border: none;
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
}

.btn-icon:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Get API Button - Special styling */
.btn-get-api {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-radius: 50px;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-get-api:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-get-api svg {
    flex-shrink: 0;
}

[data-theme="light"] .btn-get-api {
    background: #ffffff;
    border-color: #e2e8f0;
}

[data-theme="light"] .btn-get-api:hover {
    background: #f8fafc;
    border-color: #10b981;
    color: #10b981;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.15);
}

/* Hide API button on mobile devices - Desktop only feature */
@media (max-width: 1023px), (hover: none) and (pointer: coarse) {
    .btn-get-api {
        display: none !important;
    }
}

/* ===== CHAT CONTAINER & WELCOME SCREEN ===== */

/* Chat Container - ULTRA SMOOTH SCROLLING */
.chat-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
    contain: layout style;
    scroll-behavior: auto;
}

/* Welcome Screen */
.welcome {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100%;
    padding: 40px 20px;
}

.welcome-content {
    max-width: 800px;
    width: 100%;
    text-align: center;
}

.logo-container {
    position: relative;
    display: inline-block;
    margin-bottom: 32px;
}

.logo-glow {
    position: absolute;
    inset: -20px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.3), transparent 70%);
    animation: pulse 4s ease-in-out infinite;
    will-change: opacity;
}

@keyframes pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}

.logo {
    position: relative;
    animation: float 5s ease-in-out infinite;
    will-change: transform;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.welcome-title {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 48px;
    letter-spacing: -0.02em;
}

.suggestions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 12px;
}

.suggestion-card {
    padding: 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    text-align: left;
    transition: all 0.3s var(--ease-out-expo);
    color: inherit;
    font-family: inherit;
    font-size: inherit;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.suggestion-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(62, 180, 137, 0.1));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.suggestion-card:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

.suggestion-card:hover::before {
    opacity: 1;
}

.suggestion-card:active {
    transform: translateY(-2px) scale(1);
}

.suggestion-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.suggestion-card:hover .suggestion-icon {
    transform: scale(1.1) rotate(5deg);
}

.suggestion-text {
    flex: 1;
}

.suggestion-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.suggestion-desc {
    font-size: 12px;
    color: var(--text-secondary);
}

/* ===== MESSAGES ===== */

/* Messages - Optimized for smooth scrolling */
.messages {
    padding: 24px;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
    contain: content;
}

.message {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    animation: slideIn 0.25s ease-out;
    max-width: 85%;
    contain: layout style paint;
}

.message.user {
    flex-direction: row-reverse;
    align-self: flex-end;
}

.message.assistant {
    align-self: flex-start;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    .message,
    .suggestion-card,
    .code-block,
    .logo,
    .logo-glow,
    .ai-logo-hex,
    .ai-logo-core {
        animation: none !important;
        transition: opacity 0.15s ease !important;
    }
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
    position: relative;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s ease;
}

.message-avatar::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 50%;
    background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.2));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.message:hover .message-avatar::before {
    opacity: 1;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--user-avatar), var(--accent-secondary));
    color: white;
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, var(--ai-avatar), var(--accent));
    color: white;
}

/* AI Logo Avatar Styles */
.message-avatar.ai-avatar-logo {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    padding: 0;
    overflow: visible;
}

[data-theme="light"] .message-avatar.ai-avatar-logo {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.ai-logo {
    width: 24px;
    height: 24px;
}

.ai-logo-hex {
    animation: hexRotate 12s linear infinite;
    transform-origin: center;
    will-change: transform;
}

.ai-logo-core {
    animation: corePulse 3s ease-in-out infinite;
    transform-origin: center;
    will-change: transform, opacity;
}

/* Typing avatar animation */
.typing-avatar .ai-logo-hex {
    animation: hexRotate 3s linear infinite;
}

.typing-avatar .ai-logo-core {
    animation: corePulse 1s ease-in-out infinite;
}

@keyframes hexRotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes corePulse {
    0%, 100% { 
        transform: scale(1);
        opacity: 1;
    }
    50% { 
        transform: scale(1.15);
        opacity: 0.85;
    }
}

.message:hover .ai-avatar-logo {
    transform: scale(1.05);
}

.message:hover .ai-avatar-logo .ai-logo-hex {
    animation-duration: 4s;
}

.message:hover .ai-avatar-logo .ai-logo-core {
    animation-duration: 1.2s;
}

.message-bubble {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
    max-width: 100%;
}

.message.user .message-bubble {
    align-items: flex-end;
}

.message.assistant .message-bubble {
    align-items: flex-start;
    position: relative;
    width: 100%;
    overflow: visible;
}

/* ===== Message Indicators Container ===== */
.message-indicators {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-bottom: 8px;
}

/* ===== Model Indicator ===== */
.model-indicator {
    display: inline-flex;
    align-items: center;
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    background: rgba(62, 180, 137, 0.1);
    padding: 3px 8px;
    border-radius: 10px;
    letter-spacing: 0.3px;
    border: 1px solid rgba(62, 180, 137, 0.2);
}

[data-theme="light"] .model-indicator {
    background: rgba(16, 185, 129, 0.1);
    color: #059669;
    border-color: rgba(16, 185, 129, 0.2);
}

/* ===== Internet Indicator ===== */
.internet-indicator {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 10px;
    font-weight: 500;
    color: #3b82f6;
    background: rgba(59, 130, 246, 0.1);
    padding: 3px 8px;
    border-radius: 10px;
    letter-spacing: 0.2px;
    border: 1px solid rgba(59, 130, 246, 0.2);
    cursor: help;
    animation: internetPulse 2s ease-in-out;
}

.internet-indicator svg {
    width: 12px;
    height: 12px;
    stroke: #3b82f6;
    flex-shrink: 0;
}

.internet-indicator span {
    white-space: nowrap;
}

[data-theme="light"] .internet-indicator {
    background: rgba(59, 130, 246, 0.08);
    color: #2563eb;
    border-color: rgba(59, 130, 246, 0.15);
}

[data-theme="light"] .internet-indicator svg {
    stroke: #2563eb;
}

@keyframes internetPulse {
    0% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.4);
    }
    50% {
        box-shadow: 0 0 0 4px rgba(59, 130, 246, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0);
    }
}

/* ===== Message Action Buttons (Copy & Regenerate) ===== */
.msg-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    opacity: 0;
    transform: translateY(5px);
    transition: all 0.2s ease;
}

.message.assistant:hover .msg-actions {
    opacity: 1;
    transform: translateY(0);
}

.msg-action-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-tertiary);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.msg-action-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--accent);
}

.msg-action-btn:active {
    transform: scale(0.95);
}

.msg-action-btn svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.msg-action-btn.copied {
    color: var(--success);
    border-color: var(--success);
}

.msg-action-btn.regenerate-btn:hover {
    color: var(--accent);
}

.msg-action-btn.regenerate-btn:hover svg {
    animation: spin 0.5s ease;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* PDF Export Button */
.msg-action-btn.pdf-export-btn {
    transition: all 0.2s ease;
}

.msg-action-btn.pdf-export-btn:hover {
    color: #ef4444;
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.msg-action-btn.pdf-export-btn:hover svg {
    animation: pdfBounce 0.4s ease;
}

@keyframes pdfBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

[data-theme="light"] .msg-action-btn.pdf-export-btn:hover {
    color: #dc2626;
    border-color: #dc2626;
    background: rgba(220, 38, 38, 0.1);
}

/* ===== Listen Aloud Button ===== */
.msg-action-btn.listen-aloud-btn {
    transition: all 0.2s ease;
}

.msg-action-btn.listen-aloud-btn .stop-icon {
    display: none;
}

.msg-action-btn.listen-aloud-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.msg-action-btn.listen-aloud-btn:hover .listen-icon {
    animation: soundWave 0.6s ease infinite;
}

@keyframes soundWave {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.msg-action-btn.listen-aloud-btn.playing {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    animation: pulse-glow 1.5s ease-in-out infinite;
}

.msg-action-btn.listen-aloud-btn.playing:hover {
    background: var(--accent-hover);
    color: white;
}

.msg-action-btn.listen-aloud-btn .stop-text {
    display: none;
}

.msg-action-btn.listen-aloud-btn.playing .listen-icon,
.msg-action-btn.listen-aloud-btn.playing .listen-text {
    display: none;
}

.msg-action-btn.listen-aloud-btn.playing .stop-icon,
.msg-action-btn.listen-aloud-btn.playing .stop-text {
    display: block;
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(62, 180, 137, 0.4);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(62, 180, 137, 0);
    }
}

/* Light theme adjustments */
[data-theme="light"] .msg-action-btn.listen-aloud-btn:hover {
    color: #10b981;
    border-color: #10b981;
    background: rgba(16, 185, 129, 0.1);
}

[data-theme="light"] .msg-action-btn.listen-aloud-btn.playing {
    background: #10b981;
    border-color: #10b981;
}

/* ===== Message Edit Button ===== */
.msg-edit-btn {
    position: absolute;
    top: 8px;
    right: -40px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 6px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-tertiary);
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s ease;
}

.message.user:hover .msg-edit-btn {
    opacity: 1;
}

.msg-edit-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--accent);
}

.msg-edit-btn:active {
    transform: scale(0.95);
}

.msg-edit-btn svg {
    width: 16px;
    height: 16px;
}

/* Position adjustment for user messages */
.message.user .message-bubble {
    position: relative;
}

.message-content {
    padding: 14px 18px;
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-primary);
    border-radius: 18px;
    max-width: 100%;
    word-wrap: break-word;
}

.message.user .message-content {
    background: var(--user-bubble);
    border-bottom-right-radius: 4px;
    padding: 20px 24px;
}

.message.assistant .message-content {
    background: transparent;
    padding: 0;
    border-bottom-left-radius: 4px;
    font-size: 15px;
    line-height: 1.75;
    width: 100%;
    max-width: 100%;
    overflow: visible;
}

/* ===== Assistant Message Typography (ChatGPT/Claude Style) ===== */
.message.assistant .message-content p {
    margin: 0 0 16px 0;
    color: var(--text-primary);
    line-height: 1.75;
}

.message.assistant .message-content p:last-child {
    margin-bottom: 0;
}

/* First paragraph after heading - tighter spacing */
.message.assistant .message-content h1 + p,
.message.assistant .message-content h2 + p,
.message.assistant .message-content h3 + p,
.message.assistant .message-content h4 + p {
    margin-top: 8px;
}

/* Headings */
.message.assistant .message-content h1,
.message.assistant .message-content h2,
.message.assistant .message-content h3,
.message.assistant .message-content h4,
.message.assistant .message-content h5,
.message.assistant .message-content h6 {
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.4;
    margin: 28px 0 14px 0;
    position: relative;
}

.message.assistant .message-content h1:first-child,
.message.assistant .message-content h2:first-child,
.message.assistant .message-content h3:first-child,
.message.assistant .message-content h4:first-child,
.message.assistant .message-content h5:first-child,
.message.assistant .message-content h6:first-child {
    margin-top: 0;
}

.message.assistant .message-content h1 {
    font-size: 1.6em;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--accent);
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--accent), #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.message.assistant .message-content h2 {
    font-size: 1.4em;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 16px;
}

.message.assistant .message-content h3 {
    font-size: 1.2em;
    color: var(--accent);
    margin-bottom: 12px;
    padding-left: 14px;
    border-left: 3px solid var(--accent);
}

.message.assistant .message-content h4 {
    font-size: 1.1em;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.message.assistant .message-content h5 {
    font-size: 1.05em;
    margin-bottom: 8px;
    font-weight: 500;
}

.message.assistant .message-content h6 {
    font-size: 0.95em;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

/* Lists */
.message.assistant .message-content ul {
    margin: 16px 0 20px 0;
    padding-left: 28px;
    list-style-position: outside;
    list-style-type: none;
}

.message.assistant .message-content ul > li {
    position: relative;
}

.message.assistant .message-content ul > li::before {
    content: '';
    position: absolute;
    left: -20px;
    top: 11px;
    width: 7px;
    height: 7px;
    background: linear-gradient(135deg, var(--accent), #764ba2);
    border-radius: 50%;
    box-shadow: 0 0 6px rgba(102, 126, 234, 0.4);
}

.message.assistant .message-content li {
    margin: 12px 0;
    line-height: 1.8;
    color: var(--text-primary);
    padding-left: 4px;
}

.message.assistant .message-content li > ul,
.message.assistant .message-content li > ol {
    margin: 12px 0 12px 0;
}

/* Nested list styling */
.message.assistant .message-content ul ul > li::before {
    width: 5px;
    height: 5px;
    background: var(--accent);
    opacity: 0.7;
    box-shadow: none;
}

.message.assistant .message-content ul ul ul > li::before {
    width: 4px;
    height: 4px;
    border-radius: 1px;
    background: var(--text-secondary);
}

/* Ordered list - simple numbered style */
.message.assistant .message-content ol {
    list-style: decimal;
    padding-left: 24px;
    margin: 16px 0;
    list-style-position: outside;
}

.message.assistant .message-content ol > li {
    margin: 10px 0;
    padding-left: 8px;
}

.message.assistant .message-content ol > li::marker {
    color: var(--accent);
    font-weight: 600;
}

/* Nested ordered lists */
.message.assistant .message-content ol ol {
    list-style: decimal;
    padding-left: 24px;
    margin-top: 8px;
}

.message.assistant .message-content ol ol > li {
    margin: 8px 0;
    padding-left: 8px;
}

.message.assistant .message-content ol ol > li::marker {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Strong/Bold - ensure it doesn't look like a heading */
.message.assistant .message-content strong,
.message.assistant .message-content b {
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    font-size: inherit; /* Prevent font-size inheritance issues */
    display: inline; /* Ensure inline display */
}

/* Prevent bold text at start of paragraph from looking like heading */
.message.assistant .message-content p > strong:first-child,
.message.assistant .message-content p > b:first-child {
    font-size: inherit;
    display: inline;
}

/* Emphasis/Italic */
.message.assistant .message-content em,
.message.assistant .message-content i {
    font-style: italic;
    color: var(--text-secondary);
}

/* Underline */
.message.assistant .message-content u {
    text-decoration: underline;
    text-decoration-color: var(--accent);
    text-underline-offset: 4px;
    text-decoration-thickness: 2px;
}

/* Inline Code - Clean & Readable */
.message.assistant .message-content :not(pre) > code {
    background: rgba(30, 41, 59, 0.8);
    color: #e2e8f0;
    padding: 2px 7px;
    border-radius: 5px;
    font-family: 'SF Mono', 'Fira Code', 'JetBrains Mono', Monaco, Consolas, monospace;
    font-size: 0.9em;
    font-weight: 500;
    border: 1px solid rgba(71, 85, 105, 0.5);
    white-space: pre-wrap;
    word-break: break-word;
    display: inline;
    line-height: 1.6;
    vertical-align: baseline;
}

/* Light theme inline code */
[data-theme="light"] .message.assistant .message-content :not(pre) > code {
    background: #f1f5f9;
    color: #475569;
    border-color: #e2e8f0;
}

/* Code Blocks */
.message.assistant .message-content pre {
    background: #1a1b26;
    border: 1px solid var(--border);
    border-radius: 12px;
    margin: 16px 0;
    overflow: hidden;
    position: relative;
}

.message.assistant .message-content pre code {
    display: block;
    padding: 16px 20px;
    overflow-x: auto;
    font-family: 'SF Mono', 'Fira Code', 'JetBrains Mono', Monaco, Consolas, monospace;
    font-size: 13px;
    line-height: 1.6;
    color: #a9b1d6;
    background: transparent;
    border: none;
    white-space: pre-wrap;
    word-wrap: break-word;
    word-break: break-word;
}

/* Blockquotes */
.message.assistant .message-content blockquote {
    margin: 24px 0;
    padding: 20px 28px;
    border-left: 4px solid var(--accent);
    background: linear-gradient(90deg, rgba(102, 126, 234, 0.08) 0%, transparent 100%);
    border-radius: 0 12px 12px 0;
    color: var(--text-secondary);
    font-style: italic;
    position: relative;
    box-shadow: 0 2px 12px rgba(102, 126, 234, 0.08);
}

.message.assistant .message-content blockquote::before {
    content: '"';
    position: absolute;
    top: -8px;
    left: 14px;
    font-size: 3.5em;
    color: var(--accent);
    opacity: 0.25;
    font-family: Georgia, serif;
    line-height: 1;
}

.message.assistant .message-content blockquote p {
    margin: 0;
    padding-left: 24px;
    line-height: 1.8;
}

/* Horizontal Rule */
.message.assistant .message-content hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, var(--accent) 20%, var(--accent) 80%, transparent 100%);
    margin: 32px 0;
    opacity: 0.4;
    border-radius: 1px;
}

/* Math Rendering Styles */
.message.assistant .message-content .math-block {
    display: block;
    margin: 20px 0;
    padding: 20px 24px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.08) 0%, rgba(118, 75, 162, 0.08) 100%);
    border-radius: 12px;
    border-left: 4px solid var(--accent);
    overflow-x: auto;
    text-align: center;
}

.message.assistant .message-content .math-block .katex-display {
    margin: 0;
    padding: 0;
}

.message.assistant .message-content .math-inline {
    display: inline;
    padding: 2px 6px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 4px;
    vertical-align: middle;
}

.message.assistant .message-content .math-fallback {
    font-family: 'Times New Roman', 'Cambria Math', Georgia, serif;
    font-style: italic;
    letter-spacing: 0.5px;
}

.message.assistant .message-content .math-block.math-fallback {
    font-size: 1.15em;
    line-height: 1.8;
}

/* KaTeX overrides for better appearance */
.message.assistant .message-content .katex {
    font-size: 1.1em;
    color: var(--text-primary);
}

.message.assistant .message-content .math-block .katex {
    font-size: 1.25em;
}

.message.assistant .message-content .katex-display > .katex {
    display: inline-block;
    text-align: center;
}

/* Light theme math adjustments */
[data-theme="light"] .message.assistant .message-content .math-block {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.12) 0%, rgba(118, 75, 162, 0.12) 100%);
}

[data-theme="light"] .message.assistant .message-content .math-inline {
    background: rgba(102, 126, 234, 0.15);
}

/* Auto-formatted math expressions (superscripts, subscripts, scientific notation) */
.message.assistant .message-content .math-expr {
    font-family: 'Times New Roman', 'Cambria Math', Georgia, serif;
    font-style: italic;
    letter-spacing: 0.3px;
}

/* Styled Unicode math symbols */
.message.assistant .message-content .math-symbol {
    font-family: 'Times New Roman', 'Cambria Math', Georgia, serif;
    color: var(--accent);
    font-weight: 500;
    font-size: 1.05em;
    padding: 0 1px;
}

/* Greek letters styling */
.message.assistant .message-content .math-symbol:is([data-symbol="α"], [data-symbol="β"], [data-symbol="γ"], [data-symbol="δ"], [data-symbol="π"], [data-symbol="θ"], [data-symbol="λ"], [data-symbol="σ"], [data-symbol="ω"]) {
    font-style: italic;
}

/* Streaming math cursor */
.message.assistant .message-content .math-cursor {
    animation: blink 1s step-end infinite;
    color: var(--accent);
    font-weight: bold;
}

.message.assistant .message-content .streaming-math {
    opacity: 0.9;
    border-right: 2px solid var(--accent);
    animation: pulse-streaming 1.5s ease-in-out infinite;
}

@keyframes pulse-streaming {
    0%, 100% { opacity: 0.9; }
    50% { opacity: 1; }
}

/* Links */
.message.assistant .message-content a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.2s ease;
    font-weight: 500;
}

.message.assistant .message-content a:hover {
    border-bottom-color: var(--accent);
    color: var(--accent-hover);
}

.message.assistant .message-content a::after {
    content: '↗';
    font-size: 0.75em;
    margin-left: 2px;
    opacity: 0.6;
    vertical-align: super;
}

/* Tables */
.message.assistant .message-content table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 20px 0;
    font-size: 14px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border);
}

.message.assistant .message-content th,
.message.assistant .message-content td {
    padding: 14px 18px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.message.assistant .message-content th {
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-elevated) 100%);
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.5px;
}

.message.assistant .message-content tr:last-child td {
    border-bottom: none;
}

.message.assistant .message-content tr:nth-child(even) {
    background: rgba(102, 126, 234, 0.03);
}

.message.assistant .message-content tr:hover {
    background: rgba(102, 126, 234, 0.06);
}

/* User message content */
.message-content p {
    margin-bottom: 12px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content pre {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin: 12px 0;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message-content code {
    font-family: 'SF Mono', 'Fira Code', 'JetBrains Mono', Monaco, Consolas, monospace;
    font-size: 0.9em;
    line-height: 1.5;
}

.message-content :not(pre) > code {
    background: rgba(30, 41, 59, 0.8);
    color: #e2e8f0;
    padding: 2px 7px;
    border-radius: 5px;
    border: 1px solid rgba(71, 85, 105, 0.5);
    white-space: pre-wrap;
    word-break: break-word;
    display: inline;
}

[data-theme="light"] .message-content :not(pre) > code {
    background: #f1f5f9;
    color: #475569;
    border-color: #e2e8f0;
}

/* Code block styles are defined in the "Code Block - Modern Sleek Design" section below */

.message-attachments {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 8px;
}

.attachment-item {
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Image attachment styles */
.attachment-item.attachment-image {
    flex-direction: column;
    padding: 8px;
    max-width: 280px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.attachment-item.attachment-image:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.attachment-image-preview {
    max-width: 100%;
    max-height: 200px;
    width: auto;
    height: auto;
    border-radius: 6px;
    object-fit: contain;
    background: var(--bg-secondary);
}

.attachment-image-name {
    font-size: 11px;
    color: var(--text-secondary);
    text-align: center;
    word-break: break-word;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-top: 4px;
}

.attachment-icon {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    background: var(--bg-elevated);
    display: flex;
    align-items: center;
    justify-content: center;
}

.attachment-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px;
}

.typing-indicator {
    display: flex;
    gap: 10px;
    padding: 12px 0;
    align-items: center;
}

.typing-dots {
    display: flex;
    gap: 6px;
    align-items: center;
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #764ba2);
    animation: typing 1.4s infinite;
    box-shadow: 0 0 8px rgba(102, 126, 234, 0.4);
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

.typing-text {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    opacity: 0;
    max-width: 0;
    overflow: hidden;
    white-space: nowrap;
    transition: opacity 0.3s ease, max-width 0.3s ease;
}

.typing-text:not(:empty) {
    opacity: 1;
    max-width: 300px;
}

.typing-status {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 8px;
    opacity: 0.8;
    animation: fadeInStatus 0.3s ease-out;
}

@keyframes fadeInStatus {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 0.8; transform: translateY(0); }
}

/* Mobile typing indicator */
@media (max-width: 768px) {
    .typing-indicator {
        gap: 8px;
        padding: 10px 0;
    }
    
    .typing-dots {
        gap: 5px;
    }
    
    .typing-dot {
        width: 7px;
        height: 7px;
    }
    
    .typing-text {
        font-size: 12px;
        max-width: 200px;
    }
    
    .typing-text:not(:empty) {
        max-width: 200px;
    }
}

/* Small mobile */
@media (max-width: 480px) {
    .typing-indicator {
        gap: 6px;
        padding: 8px 0;
    }
    
    .typing-dots {
        gap: 4px;
    }
    
    .typing-dot {
        width: 6px;
        height: 6px;
    }
    
    .typing-text {
        font-size: 11px;
        max-width: 150px;
    }
    
    .typing-text:not(:empty) {
        max-width: 150px;
    }
}

@keyframes typing {
    0%, 60%, 100% { opacity: 0.4; transform: scale(0.85); }
    30% { opacity: 1; transform: scale(1.1); }
}

/* Regenerating indicator styles */
.message.regenerating {
    position: relative;
}

.message.regenerating .message-bubble {
    opacity: 0.9;
}

.regenerating-indicator {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 0;
    color: var(--text-secondary);
}

.regenerating-spinner {
    display: flex;  
    align-items: center;
    justify-content: center;
    animation: regenerate-spin 1.2s linear infinite;
}

.regenerating-spinner svg {
    color: var(--accent);
}

.regenerating-text {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    animation: regenerate-pulse 1.5s ease-in-out infinite;
}

@keyframes regenerate-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes regenerate-pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* Mobile regenerating indicator */
@media (max-width: 768px) {
    .regenerating-indicator {
        gap: 10px;
        padding: 12px 0;
    }
    
    .regenerating-spinner svg {
        width: 18px;
        height: 18px;
    }
    
    .regenerating-text {
        font-size: 13px;
    }
}

/* Streaming message styles - GPU optimized for smooth rendering */
.message.streaming {
    contain: content;
}

.message.streaming .streaming-content {
    min-height: 24px;
}

.message.streaming .streaming-content::after {
    content: '▋';
    display: inline-block;
    animation: modern-cursor-blink 1s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    color: var(--accent);
    margin-left: 2px;
    will-change: opacity;
}

/* Modern cursor blink - smooth fade instead of harsh step */
@keyframes modern-cursor-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.2; }
}

/* Legacy blink for compatibility */
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.2; }
}

/* Note: Unused animations removed for production optimization */

/* ===== INPUT AREA ===== */

/* Input Area */
.input-area {
    padding: 12px 16px;
    background: var(--bg-primary);
    /* Ensure input area is always visible and properly positioned */
    flex-shrink: 0;
    position: relative;
    z-index: 50;
    /* Smooth transitions for keyboard open/close on touch devices */
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1),
                bottom 0.25s cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow 0.2s ease;
    will-change: transform, bottom;
}

.attachments-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.attachment-preview {
    position: relative;
    padding: 6px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 11px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.attachment-preview .attachment-thumbnail {
    width: 32px;
    height: 32px;
    object-fit: cover;
    border-radius: 4px;
    flex-shrink: 0;
}

.attachment-preview-remove {
    padding: 2px;
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.15s;
}

.attachment-preview-remove:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.input-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 8px 12px;
    transition: all 0.2s;
}

.input-container:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(62, 180, 137, 0.12);
}

.btn-attach {
    padding: 6px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 50%;
    transition: all 0.15s;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-attach:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn-attach:active {
    transform: scale(0.95);
}

.input-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
}

#messageInput {
    width: 100%;
    max-height: 120px;
    padding: 4px 0;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    resize: none;
    outline: none;
    line-height: 1.4;
}

#messageInput::placeholder {
    color: var(--text-tertiary);
}

.btn-send {
    width: 32px;
    height: 32px;
    padding: 0;
    background: var(--accent);
    border: none;
    color: white;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s var(--ease-out-expo);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: visible;
}

.btn-send:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: scale(1.05);
    box-shadow: 0 0 12px rgba(62, 180, 137, 0.35);
}

.btn-send:active:not(:disabled) {
    transform: scale(0.95);
}

.btn-send:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    background: var(--text-tertiary);
}

.btn-send.loading {
    opacity: 0.6;
    pointer-events: none;
}

.btn-send.loading svg {
    animation: pulse-send 1s ease-in-out infinite;
}

/* Generating state - stop button */
.btn-send.generating {
    background: #ef4444;
    opacity: 1;
    pointer-events: auto;
    cursor: pointer;
}

.btn-send.generating:hover {
    background: #dc2626;
    transform: scale(1.05);
    box-shadow: 0 0 12px rgba(239, 68, 68, 0.4);
}

.btn-send.generating:active {
    transform: scale(0.95);
}

.btn-send.generating svg {
    animation: pulse-stop 1s ease-in-out infinite;
}

@keyframes pulse-stop {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(0.9); }
}

@keyframes pulse-send {
    0%, 100% { opacity: 1; transform: translateY(0); }
    50% { opacity: 0.5; transform: translateY(-1px); }
}

.btn-send svg {
    transition: transform 0.2s ease;
}

.btn-send:hover:not(:disabled) svg {
    transform: translateY(-2px);
}

.input-footer {
    max-width: 800px;
    margin: 8px auto 0;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.input-hint {
    font-size: 11px;
    color: var(--text-tertiary);
}

.offline-indicator {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
    padding: 2px 8px;
    border-radius: 10px;
    animation: pulse-offline 2s ease-in-out infinite;
}

.offline-indicator svg {
    stroke: #ef4444;
}

@keyframes pulse-offline {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* Connection quality indicator for weak internet feedback */
.connection-quality-indicator {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.connection-quality-indicator.excellent {
    color: #22c55e;
    background: rgba(34, 197, 94, 0.1);
}

.connection-quality-indicator.good {
    color: #3b82f6;
    background: rgba(59, 130, 246, 0.1);
}

.connection-quality-indicator.fair {
    color: #f59e0b;
    background: rgba(245, 158, 11, 0.1);
}

.connection-quality-indicator.poor {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
    animation: pulse-offline 1.5s ease-in-out infinite;
}

.docs-link {
    color: var(--accent);
    text-decoration: none;
    cursor: pointer;
    transition: color 0.2s ease;
}

.docs-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* API Code Modal */
.api-code-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.2s ease-out;
}

.api-code-modal-overlay.active {
    display: flex;
}

.api-code-modal {
    background: var(--bg-secondary);
    border-radius: 16px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    width: 90%;
    max-width: 900px;
    max-height: 85vh;
    overflow: hidden;
    animation: scaleIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
}

.api-code-modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.api-code-modal-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.api-code-modal-title svg {
    color: var(--accent);
}

.api-code-modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.api-code-modal-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.api-code-modal-content {
    padding: 28px;
    overflow-y: auto;
    flex: 1;
    background: var(--bg-secondary);
}

.api-model-selector {
    margin-bottom: 24px;
}

.api-model-selector h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 16px 0;
}

.api-model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.api-model-option {
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.api-model-option:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
    transform: translateY(-2px);
}

.api-model-option.selected {
    background: var(--accent) !important;
    border-color: var(--accent) !important;
}

.api-model-option.selected .api-model-option-name,
.api-model-option.selected .api-model-option-endpoint {
    color: white !important;
    opacity: 1 !important;
}

.api-model-option-name {
    font-size: 15px;
    font-weight: 600;
    display: block;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.api-model-option-endpoint {
    font-size: 12px;
    opacity: 0.7;
    font-family: 'Courier New', monospace;
    display: block;
    color: var(--text-secondary);
}

.api-code-examples {
    display: none;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 2px solid var(--border);
    animation: slideInUp 0.3s ease-out;
}

.api-code-examples.active {
    display: block;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.api-language-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border);
    padding-bottom: 0;
}

.api-language-tab {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 600;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s ease;
}

.api-language-tab:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.api-language-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    background: transparent;
}

.api-code-block {
    display: none;
}

.api-code-block.active {
    display: block;
}

.api-code-section {
    margin-bottom: 24px;
}

.api-code-section h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 16px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.api-code-section h4::before {
    content: '';
    width: 4px;
    height: 16px;
    background: var(--accent);
    border-radius: 2px;
}

.api-code-wrapper {
    position: relative;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 16px;
}

.api-code-copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    z-index: 10;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.api-code-copy-btn:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.api-code-copy-btn:active {
    transform: translateY(0);
}

.api-code-copy-btn.copied {
    background: var(--success);
    color: white;
    border-color: var(--success);
}

.api-code-copy-btn svg {
    flex-shrink: 0;
}

.api-code-pre {
    margin: 0;
    padding: 16px;
    padding-right: 80px;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-primary);
    white-space: pre;
    word-wrap: normal;
}

.api-code-pre code {
    font-family: 'Courier New', monospace;
    font-size: 13px;
    color: var(--text-primary);
}

.api-code-pre::-webkit-scrollbar {
    height: 8px;
}

.api-code-pre::-webkit-scrollbar-track {
    background: transparent;
}

.api-code-pre::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.api-code-pre::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

.api-code-modal-content::-webkit-scrollbar {
    width: 8px;
}

.api-code-modal-content::-webkit-scrollbar-track {
    background: transparent;
}

.api-code-modal-content::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.api-code-modal-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* API Endpoint Info Box */
.api-endpoint-info {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 20px;
}

.api-endpoint-info-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.api-endpoint-info-header strong {
    color: var(--text-primary);
}

.api-endpoint-info code {
    color: var(--accent);
    font-size: 14px;
}

/* Light theme */
[data-theme="light"] .api-code-modal-overlay {
    background: rgba(0, 0, 0, 0.5);
}

[data-theme="light"] .api-code-modal {
    background: #ffffff;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .api-code-modal-content {
    background: #ffffff;
}

[data-theme="light"] .api-model-option {
    background: #f8fafc;
}

[data-theme="light"] .api-model-option:hover {
    background: #f1f5f9;
}

[data-theme="light"] .api-model-option.selected {
    background: var(--accent);
    border-color: var(--accent);
}

[data-theme="light"] .api-model-option.selected .api-model-option-name,
[data-theme="light"] .api-model-option.selected .api-model-option-endpoint {
    color: white !important;
    opacity: 1 !important;
}

[data-theme="light"] .api-code-wrapper {
    background: #f8fafc;
}

[data-theme="light"] .api-code-copy-btn {
    background: #ffffff;
    color: #1e293b;
    border-color: #cbd5e1;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .api-code-copy-btn:hover {
    background: #10b981;
    color: white;
    border-color: #10b981;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
}

/* Documentation Modal */
.docs-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    z-index: 10000;
    display: none;
    align-items: stretch;
    justify-content: stretch;
    padding: 0;
    opacity: 0;
    transition: opacity 0.2s ease;
    will-change: opacity;
}

.docs-modal-overlay.show {
    display: flex;
    opacity: 1;
}

.docs-modal {
    background: var(--bg-secondary);
    border-radius: 0;
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    display: flex;
    flex-direction: column;
    box-shadow: none;
    border: none;
    transform: scale(0.98);
    opacity: 0;
    transition: transform 0.2s ease-out, opacity 0.2s ease-out;
}

.docs-modal-overlay.show .docs-modal {
    transform: scale(1);
    opacity: 1;
}

.docs-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.docs-modal-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.docs-modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.docs-modal-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.docs-modal-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 24px;
    scroll-behavior: smooth;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
}

.docs-modal-content::-webkit-scrollbar {
    width: 8px;
}

.docs-modal-content::-webkit-scrollbar-track {
    background: transparent;
}

.docs-modal-content::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.docs-modal-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Documentation Content Styles */
.docs-section {
    margin-bottom: 32px;
}

.docs-section:last-child {
    margin-bottom: 0;
}

.docs-section-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent);
    display: flex;
    align-items: center;
    gap: 10px;
}

.docs-section-title svg {
    color: var(--accent);
}

.docs-text {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

.docs-text:last-child {
    margin-bottom: 0;
}

.docs-highlight {
    color: var(--accent);
    font-weight: 500;
}

.docs-model-card {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
    transition: all 0.2s ease;
}

.docs-model-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.docs-model-card:last-child {
    margin-bottom: 0;
}

.docs-model-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.docs-model-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.docs-model-badge {
    font-size: 10px;
    padding: 3px 8px;
    border-radius: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.docs-model-desc {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
    line-height: 1.6;
}

.docs-model-specs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}

.docs-spec {
    background: var(--bg-secondary);
    padding: 12px;
    border-radius: 8px;
    text-align: center;
}

.docs-spec-label {
    font-size: 11px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.docs-spec-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.docs-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.docs-list li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: var(--text-secondary);
    line-height: 1.6;
}

.docs-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
}

.docs-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
}

.docs-table th,
.docs-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.docs-table th {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 600;
}

.docs-table td {
    color: var(--text-secondary);
}

.docs-table tr:hover td {
    background: var(--bg-tertiary);
}

.docs-founder-card {
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-elevated) 100%);
    border-radius: 12px;
    padding: 24px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 20px;
}

.docs-founder-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.docs-founder-info {
    flex: 1;
    min-width: 0;
}

.docs-founder-info h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.docs-founder-info p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

/* Mobile founder card - stack vertically */
@media (max-width: 480px) {
    .docs-founder-card {
        flex-direction: column;
        text-align: center;
        padding: 20px;
        gap: 16px;
    }
    
    .docs-founder-avatar {
        width: 72px;
        height: 72px;
        font-size: 28px;
    }
    
    .docs-founder-info h4 {
        font-size: 17px;
    }
    
    .docs-founder-info p {
        font-size: 13px;
    }
}

.docs-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 8px;
    padding: 16px;
    margin: 16px 0;
}

.docs-warning-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: #f59e0b;
    margin-bottom: 8px;
}

.docs-warning-text {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

/* Context Menu */
.context-menu {
    position: fixed;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 4px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    display: none;
}

.context-menu.show {
    display: block;
    animation: fadeIn 0.15s var(--ease-out-expo);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ===== Micro-interactions ===== */
.btn-new-chat:active,
.chat-item:active,
.btn-icon:active,
.btn-attach:active {
    transform: scale(0.95);
}

/* Smooth input focus */
#messageInput:focus {
    animation: inputFocus 0.3s ease;
}

@keyframes inputFocus {
    0% { transform: scale(1); }
    50% { transform: scale(1.01); }
    100% { transform: scale(1); }
}

/* Model selector - simplified */
.model-option {
    opacity: 1;
}

/* Smooth gradient backgrounds - simplified */
.logo-container::after {
    content: '';
    position: absolute;
    inset: -40px;
    background: radial-gradient(circle, rgba(62, 180, 137, 0.12), transparent 60%);
    pointer-events: none;
}

/* Code block - no animation for performance (styling in main section) */

/* Sidebar transitions */
.sidebar.open {
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.25);
}

/* Welcome screen - simplified animations */
.welcome-content {
    animation: fadeIn 0.3s ease-out;
}

.welcome-title {
    opacity: 1;
}

.suggestions {
    opacity: 1;
}

/* Smooth context menu */
.context-menu {
    transform-origin: top left;
}

.context-menu.show {
    animation: scaleIn 0.15s ease-out;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Loading states - no animation for disabled button */
.btn-send:disabled {
    opacity: 0.4;
}

/* Smooth hover transitions for interactive elements - optimized */
button, input, textarea, select {
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

a {
    transition: color 0.15s ease;
}

/* Enhanced scrollbar */
::-webkit-scrollbar-thumb {
    background: var(--border);
    transition: background 0.2s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

::-webkit-scrollbar-thumb:active {
    background: var(--accent);
}

/* Theme transitions - only on explicit toggle */
[data-theme-transitioning] {
    transition: background-color 0.2s ease, color 0.2s ease;
}

/* Enhanced input container */
.input-container {
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

/* Attachment preview - simplified */
.attachment-preview {
    position: relative;
    transition: background-color 0.15s ease;
}

.attachment-preview:hover {
    background: var(--bg-hover);
}

/* Message bubble - no transform on hover for performance */
.message-bubble {
    transition: none;
}

.context-menu-item {
    width: 100%;
    padding: 8px 12px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    border-radius: 6px;
    transition: all 0.15s;
    text-align: left;
}

.context-menu-item:hover {
    background: var(--bg-hover);
}

.context-menu-item[data-action="delete"] {
    color: var(--error);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    will-change: opacity;
}

.modal.show {
    display: flex;
    animation: fadeIn 0.15s var(--ease-out-expo);
}

.modal-content {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    max-width: 400px;
    width: 90%;
}

.modal-content h3 {
    font-size: 18px;
    margin-bottom: 16px;
}

.modal-content input {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    margin-bottom: 16px;
}

.modal-content input:focus {
    outline: none;
    border-color: var(--accent);
}

.modal-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

.btn-primary, .btn-secondary {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--bg-hover);
}

/* Scrollbar - Optimized for smooth scrolling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
    transition: background 0.15s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Hide scrollbar during fast scroll for performance */
.chat-container:active::-webkit-scrollbar-thumb {
    background: var(--accent);
}

/* Firefox scrollbar - use html selector to avoid performance issues */

/* Sidebar overlay for mobile */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 99;
    will-change: opacity;
}

/* Tablet styles */
@media (max-width: 1024px) {
    .suggestions {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .welcome-title {
        font-size: 28px;
        margin-bottom: 32px;
    }
    
    .logo-container {
        margin-bottom: 24px;
    }
    
    .logo {
        width: 56px;
        height: 56px;
    }
}

/* ===== ChatGPT-Style Mobile UI ===== */
@media (max-width: 768px) {
    :root {
        --header-height: 56px;
        --sidebar-width: 300px;
        --mobile-safe-bottom: env(safe-area-inset-bottom, 0px);
        --mobile-safe-top: env(safe-area-inset-top, 0px);
    }
    
    /* Full-screen app layout */
    .app {
        height: 100vh;
        height: 100dvh;
        overflow: hidden;
    }
    
    /* Sidebar - Full screen drawer style */
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        height: 100dvh;
        width: var(--sidebar-width);
        max-width: 85vw;
        z-index: 1000;
        transform: translateX(-100%);
        box-shadow: none;
        margin-left: 0 !important;
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        padding-top: var(--mobile-safe-top);
        background: var(--bg-secondary);
    }
    
    .sidebar.open {
        transform: translateX(0);
        box-shadow: 0 0 40px rgba(0, 0, 0, 0.5);
    }
    
    .sidebar.collapsed {
        margin-left: 0 !important;
        transform: translateX(-100%);
    }
    
    .sidebar-overlay.show {
        display: block;
        animation: fadeIn 0.2s ease;
    }
    
    /* Sidebar header */
    .sidebar-header {
        padding: 16px;
        border-bottom: 1px solid var(--border);
    }
    
    .btn-new-chat {
        padding: 14px 16px;
        font-size: 15px;
        border-radius: 12px;
        font-weight: 600;
    }
    
    /* Chat list */
    .chat-list {
        padding: 12px;
    }
    
    .chat-item {
        padding: 14px 16px;
        margin-bottom: 4px;
        border-radius: 12px;
        font-size: 15px;
        min-height: 48px;
        display: flex;
        align-items: center;
    }
    
    .chat-item-menu {
        opacity: 1;
        padding: 8px;
        min-width: 36px;
        min-height: 36px;
    }
    
    /* Sidebar footer */
    .sidebar-footer {
        padding: 16px;
        padding-bottom: calc(16px + var(--mobile-safe-bottom));
    }
    
    .user-menu {
        padding: 12px 14px;
        border-radius: 12px;
    }
    
    .user-avatar {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }
    
    .user-name {
        font-size: 15px;
    }
    
    /* Header - ChatGPT style centered title */
    .header {
        height: var(--header-height);
        padding: 0 12px;
        padding-top: var(--mobile-safe-top);
        gap: 8px;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border);
        position: sticky;
        top: 0;
        z-index: 100;
    }
    
    .header-title {
        flex: 1;
        text-align: center;
        display: flex;
        justify-content: center;
        align-items: center;
    }
    
    .header-title h1 {
        font-size: 17px;
        font-weight: 600;
        max-width: 180px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
    
    .btn-toggle-sidebar {
        width: 40px;
        height: 40px;
        padding: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 10px;
    }
    
    .btn-toggle-sidebar svg {
        width: 22px;
        height: 22px;
    }
    
    .btn-icon {
        width: 40px;
        height: 40px;
        padding: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 10px;
    }
    
    .btn-icon svg {
        width: 20px;
        height: 20px;
    }
    
    .header-actions {
        gap: 4px;
    }
    
    /* Model selector - compact for mobile */
    .model-selector-btn {
        padding: 8px 10px;
        font-size: 15px;
        border-radius: 10px;
        min-width: auto;
    }
    
    .model-name {
        max-width: 90px;
    }
    
    .model-chevron {
        width: 14px;
        height: 14px;
    }
    
    /* Main content area */
    .main {
        display: flex;
        flex-direction: column;
        height: 100vh;
        height: 100dvh;
        overflow: hidden;
    }
    
    /* Chat container - full height scrollable */
    .chat-container {
        flex: 1;
        overflow-y: auto;
        overflow-x: hidden;
        -webkit-overflow-scrolling: touch;
        overscroll-behavior-y: contain;
        scroll-behavior: smooth;
    }
    
    /* Welcome screen - ChatGPT style */
    .welcome {
        padding: 24px 20px;
        min-height: 100%;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
    
    .welcome-content {
        max-width: 100%;
    }
    
    .logo-container {
        margin-bottom: 24px;
    }
    
    .logo {
        width: 52px;
        height: 52px;
    }
    
    .logo-glow {
        inset: -15px;
    }
    
    .welcome-title {
        font-size: 24px;
        margin-bottom: 32px;
        line-height: 1.3;
    }
    
    /* Suggestions - horizontal scroll on mobile */
    .suggestions {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    
    .suggestion-card {
        padding: 16px;
        border-radius: 16px;
        flex-shrink: 0;
        min-height: auto;
        transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    
    .suggestion-card:active {
        transform: scale(0.98);
    }
    
    .suggestion-icon {
        width: 40px;
        height: 40px;
        border-radius: 10px;
    }
    
    .suggestion-icon svg {
        width: 20px;
        height: 20px;
    }
    
    .suggestion-title {
        font-size: 15px;
        font-weight: 600;
    }
    
    .suggestion-desc {
        font-size: 13px;
        margin-top: 2px;
    }
    
    /* Messages - ChatGPT style full width */
    .messages {
        padding: 12px;
        gap: 20px;
        max-width: 100%;
    }
    
    .message {
        max-width: 100%;
        gap: 10px;
        flex-direction: row;
    }
    
    .message.user {
        flex-direction: row-reverse;
    }
    
    /* Avatar - smaller on mobile */
    .message-avatar {
        width: 28px;
        height: 28px;
        font-size: 12px;
        flex-shrink: 0;
        align-self: flex-start;
    }
    
    .message-avatar.ai-avatar-logo .ai-logo {
        width: 18px;
        height: 18px;
    }
    
    /* Message content - full width bubbles */
    .message-bubble {
        flex: 1;
        min-width: 0;
        max-width: calc(100% - 38px); /* Account for avatar + gap */
    }
    
    .message-content {
        padding: 12px 14px;
        font-size: 15px;
        line-height: 1.6;
        border-radius: 18px;
        word-break: break-word;
    }
    
    .message.user .message-content {
        border-bottom-right-radius: 6px;
        padding: 14px 16px;
    }
    
    .message.assistant .message-content {
        padding: 0;
        font-size: 15px;
        line-height: 1.7;
    }
    
    /* Assistant message takes full width */
    .message.assistant .message-bubble {
        max-width: 100%;
    }
    
    /* Code blocks on mobile */
    .message-content pre {
        padding: 14px;
        font-size: 13px;
        border-radius: 12px;
        margin: 12px 0;
    }
    
    .message-content code {
        font-size: 0.88em;
    }
    
    /* Inline code on mobile - ensure readability */
    .message-content :not(pre) > code {
        padding: 2px 6px;
        font-size: 0.88em;
        white-space: pre-wrap;
        word-break: break-word;
    }
    
    .message-content :not(pre) > code {
        padding: 2px 6px;
        font-size: 13px;
    }
    
    /* Message actions - always visible on mobile */
    .msg-actions {
        opacity: 1;
        transform: translateY(0);
        margin-top: 12px;
        flex-wrap: wrap;
    }
    
    .msg-action-btn {
        padding: 10px 14px;
        font-size: 13px;
        border-radius: 10px;
        min-height: 40px;
    }
    
    .msg-edit-btn {
        opacity: 1;
        position: relative;
        top: auto;
        right: auto;
        width: auto;
        height: 40px;
        padding: 10px 14px;
        margin-top: 8px;
        border-radius: 10px;
    }
    
    /* Input area - ChatGPT style bottom bar */
    .input-area {
        padding: 12px 16px;
        padding-bottom: calc(12px + var(--mobile-safe-bottom));
        background: var(--bg-primary);
        border-top: 1px solid var(--border);
        position: sticky;
        bottom: 0;
        z-index: 50;
    }
    
    .attachments-preview {
        margin-bottom: 10px;
        max-width: 100%;
    }
    
    .attachment-preview {
        padding: 8px 12px;
        font-size: 13px;
        border-radius: 10px;
    }
    
    .input-container {
        padding: 8px 12px;
        border-radius: 24px;
        gap: 8px;
        min-height: 48px;
        max-width: 100%;
    }
    
    .input-container:focus-within {
        box-shadow: 0 0 0 2px rgba(62, 180, 137, 0.2);
    }
    
    .btn-attach {
        width: 36px;
        height: 36px;
        padding: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
    }
    
    .btn-attach svg {
        width: 20px;
        height: 20px;
    }
    
    #messageInput {
        font-size: 16px;
        max-height: 120px;
        min-height: 24px;
        padding: 6px 0;
        line-height: 1.5;
    }
    
    #messageInput::placeholder {
        font-size: 16px;
    }
    
    .btn-send {
        width: 36px;
        height: 36px;
        border-radius: 50%;
    }
    
    .btn-send svg {
        width: 18px;
        height: 18px;
    }
    
    .input-footer {
        margin-top: 10px;
    }
    
    .input-hint {
        font-size: 12px;
    }
    
    /* Modal - full screen on mobile */
    .modal-content {
        width: 100%;
        max-width: 100%;
        margin: 16px;
        padding: 24px;
        border-radius: 20px;
    }
    
    .modal-content h3 {
        font-size: 18px;
        margin-bottom: 20px;
    }
    
    .modal-content input {
        padding: 14px 16px;
        font-size: 16px;
        border-radius: 12px;
        margin-bottom: 20px;
    }
    
    .modal-actions {
        gap: 12px;
    }
    
    .btn-primary, .btn-secondary {
        padding: 14px 24px;
        font-size: 15px;
        border-radius: 12px;
        flex: 1;
        min-height: 48px;
    }
    
    /* Context menu - bottom sheet style on mobile */
    .context-menu {
        position: fixed !important;
        bottom: 0 !important;
        left: 0 !important;
        right: 0 !important;
        top: auto !important;
        border-radius: 20px 20px 0 0;
        padding: 8px 8px calc(8px + var(--mobile-safe-bottom));
        max-height: 60vh;
        animation: slideUpMobile 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .context-menu::before {
        content: '';
        display: block;
        width: 36px;
        height: 4px;
        background: var(--border);
        border-radius: 2px;
        margin: 8px auto 16px;
    }
    
    .context-menu-item {
        padding: 16px 20px;
        font-size: 16px;
        border-radius: 12px;
        min-height: 52px;
    }
    
    .context-menu-item svg {
        width: 20px;
        height: 20px;
    }
    
    /* Documentation modal - full screen */
    .docs-modal {
        border-radius: 0;
    }
    
    .docs-modal-header {
        padding: 12px 16px;
        padding-top: calc(12px + var(--mobile-safe-top));
    }
    
    .docs-modal-title {
        font-size: 16px;
    }
    
    .docs-modal-content {
        padding: 16px;
        padding-bottom: calc(16px + var(--mobile-safe-bottom));
    }
    
    /* Documentation content mobile optimizations */
    .docs-modal-content h2 {
        font-size: 18px;
        margin-top: 24px;
    }
    
    .docs-modal-content h3 {
        font-size: 16px;
    }
    
    .docs-modal-content p {
        font-size: 14px;
        line-height: 1.6;
    }
    
    .docs-modal-content ul,
    .docs-modal-content ol {
        padding-left: 20px;
    }
    
    .docs-modal-content li {
        font-size: 14px;
        margin: 8px 0;
    }
    
    /* Model cards in docs - stack on mobile */
    .docs-model-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .docs-model-card {
        padding: 14px;
    }
    
    .docs-model-card h4 {
        font-size: 15px;
    }
    
    .docs-model-card p {
        font-size: 13px;
    }
    
    /* Make table container scrollable on mobile */
    .docs-modal-content table.docs-table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        white-space: nowrap;
        font-size: 12px;
        min-width: 100%;
    }
    
    .docs-table {
        font-size: 12px;
    }
    
    .docs-table th,
    .docs-table td {
        padding: 8px 10px;
        white-space: nowrap;
    }
    
    .docs-table th:first-child,
    .docs-table td:first-child {
        position: sticky;
        left: 0;
        background: var(--bg-tertiary);
        z-index: 1;
    }
    
    .docs-table td:first-child {
        background: var(--bg-secondary);
    }
    
    /* Version navigation */
    .version-nav {
        gap: 8px;
        margin-top: 16px;
        padding-top: 12px;
    }
    
    .version-btn {
        width: 40px;
        height: 40px;
        border-radius: 10px;
    }
    
    .version-info {
        font-size: 14px;
        min-width: 60px;
    }
}

/* Small mobile styles (iPhone SE, etc.) */
@media (max-width: 480px) {
    :root {
        --header-height: 52px;
    }
    
    .header-title h1 {
        font-size: 16px;
        max-width: 140px;
    }
    
    .welcome {
        padding: 20px 16px;
    }
    
    .welcome-title {
        font-size: 22px;
        margin-bottom: 28px;
    }
    
    .logo {
        width: 48px;
        height: 48px;
    }
    
    .suggestion-card {
        padding: 14px;
    }
    
    .suggestion-icon {
        width: 36px;
        height: 36px;
    }
    
    .suggestion-title {
        font-size: 14px;
    }
    
    .suggestion-desc {
        font-size: 12px;
    }
    
    .messages {
        padding: 12px;
        gap: 20px;
    }
    
    .message-avatar {
        width: 28px;
        height: 28px;
        font-size: 12px;
    }
    
    .message-content {
        padding: 10px 14px;
        font-size: 15px;
        border-radius: 18px;
    }
    
    .input-area {
        padding: 10px 12px;
        padding-bottom: calc(10px + var(--mobile-safe-bottom));
    }
    
    .input-container {
        padding: 6px 10px;
        min-height: 44px;
    }
    
    #messageInput {
        font-size: 16px;
    }
    
    .btn-attach,
    .btn-send {
        width: 32px;
        height: 32px;
    }
    
    .btn-attach svg,
    .btn-send svg {
        width: 18px;
        height: 18px;
    }
    
    .model-selector-btn {
        padding: 6px 8px;
        font-size: 14px;
        min-width: auto;
    }
    
    .model-name {
        max-width: 70px;
    }
    
    /* Model dropdown - bottom sheet */
    .model-dropdown {
        position: fixed;
        left: 12px !important;
        right: 12px;
        bottom: calc(12px + var(--mobile-safe-bottom));
        top: auto;
        min-width: auto;
        width: auto;
        border-radius: 20px;
        padding: 12px;
        animation: slideUpMobile 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .model-option {
        padding: 14px 16px;
        border-radius: 14px;
        min-height: 56px;
    }
    
    .model-option-name {
        font-size: 15px;
    }
    
    .model-option-desc {
        font-size: 12px;
    }
    
    /* Docs table - extra compact on small screens */
    .docs-table {
        font-size: 11px;
    }
    
    .docs-table th,
    .docs-table td {
        padding: 6px 8px;
    }
}

/* Mobile animation keyframes */
@keyframes slideUpMobile {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Landscape mobile */
@media (max-width: 768px) and (orientation: landscape) {
    .welcome {
        padding: 16px 24px;
        min-height: auto;
    }
    
    .welcome-title {
        font-size: 20px;
        margin-bottom: 20px;
    }
    
    .logo-container {
        margin-bottom: 16px;
    }
    
    .logo {
        width: 40px;
        height: 40px;
    }
    
    .suggestions {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .suggestion-card {
        flex: 1 1 calc(50% - 4px);
        min-width: 200px;
        padding: 12px;
    }
    
    .messages {
        padding: 12px 24px;
    }
    
    .input-area {
        padding: 8px 24px;
        padding-bottom: calc(8px + var(--mobile-safe-bottom));
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .chat-item:hover {
        background: transparent;
    }
    
    .chat-item:active {
        background: var(--bg-hover);
    }
    
    .suggestion-card:hover {
        transform: none;
        box-shadow: none;
    }
    
    .suggestion-card:active {
        transform: scale(0.98);
        background: var(--bg-tertiary);
    }
    
    .btn-send:hover:not(:disabled) {
        transform: none;
        box-shadow: none;
    }
    
    .btn-send:active:not(:disabled) {
        transform: scale(0.95);
    }
    
    /* Larger touch targets */
    .btn-toggle-sidebar,
    .btn-icon,
    .btn-attach,
    .btn-send {
        min-width: 44px;
        min-height: 44px;
    }
    
    .chat-item {
        min-height: 52px;
    }
    
    .context-menu-item {
        min-height: 52px;
    }
}


/* ===== Code Block - Modern Sleek Design ===== */
.code-block {
    margin: 20px 0;
    border-radius: 12px;
    overflow: hidden;
    background: linear-gradient(145deg, #1a1a2e 0%, #16213e 100%);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 
        0 4px 6px -1px rgba(0, 0, 0, 0.3),
        0 2px 4px -1px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    width: 100%;
    max-width: 100%;
}

[data-theme="light"] .code-block {
    background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.5);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    gap: 12px;
    flex-wrap: nowrap;
}

[data-theme="light"] .code-header {
    background: rgba(0, 0, 0, 0.04);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.code-language {
    font-size: 13px;
    font-weight: 500;
    color: #9ca3af;
    text-transform: lowercase;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    flex-shrink: 1;
    overflow: hidden;
    text-overflow: ellipsis;
}

[data-theme="light"] .code-language {
    color: #6b7280;
}

.code-copy-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: #e2e8f0;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    flex-shrink: 0;
    white-space: nowrap;
}

.code-copy-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.2);
    color: #ffffff;
    transform: translateY(-1px);
}

[data-theme="light"] .code-copy-btn {
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.1);
    color: #475569;
}

[data-theme="light"] .code-copy-btn:hover {
    background: rgba(0, 0, 0, 0.1);
    color: #1e293b;
}

.code-copy-btn.copied {
    background: rgba(16, 185, 129, 0.2);
    border-color: rgba(16, 185, 129, 0.4);
    color: #10b981;
}

.code-copy-btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    opacity: 0.9;
}

.code-content {
    padding: 20px;
    overflow-x: hidden;
    overflow-y: hidden;
    max-width: 100%;
    font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', 'Consolas', monospace;
    font-size: 14px;
    line-height: 1.75;
    color: #e2e8f0;
    background: transparent;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

[data-theme="light"] .code-content {
    color: #334155;
}

.code-content code {
    font-family: inherit;
    background: none;
    padding: 0;
    color: inherit;
    display: block;
    white-space: pre-wrap;
    word-wrap: break-word;
    word-break: break-word;
    overflow-wrap: break-word;
    width: 100%;
    max-width: 100%;
}

/* Inline code - consistent styling */
.message-content code:not(.code-content code):not(pre code) {
    background: rgba(30, 41, 59, 0.85);
    padding: 2px 7px;
    border-radius: 5px;
    font-family: 'SF Mono', 'Fira Code', 'JetBrains Mono', Monaco, Consolas, monospace;
    font-size: 0.9em;
    color: #e2e8f0;
    border: 1px solid rgba(71, 85, 105, 0.5);
    white-space: pre-wrap;
    word-break: break-word;
    display: inline;
    line-height: 1.5;
}

[data-theme="light"] .message-content code:not(.code-content code):not(pre code) {
    background: #f1f5f9;
    color: #475569;
    border-color: #e2e8f0;
}

/* Mobile responsive code blocks */
@media (max-width: 768px) {
    .code-block {
        margin: 16px 0;
        border-radius: 14px;
    }
    
    .code-header {
        padding: 12px 16px;
    }
    
    .code-content {
        padding: 16px;
        font-size: 13px;
        line-height: 1.6;
    }
    
    .code-copy-btn {
        padding: 10px 14px;
        font-size: 13px;
        gap: 8px;
        border-radius: 10px;
        min-height: 40px;
    }
    
    .code-language {
        font-size: 13px;
    }
    
    /* Inline code */
    .message-content code:not(.code-content code) {
        padding: 3px 8px;
        font-size: 14px;
        border-radius: 8px;
    }
}

@media (max-width: 480px) {
    .code-block {
        border-radius: 12px;
    }
    
    .code-header {
        padding: 10px 14px;
    }
    
    .code-content {
        padding: 14px;
        font-size: 12px;
    }
    
    .code-copy-btn span {
        display: none;
    }
    
    .code-copy-btn {
        padding: 10px;
        min-width: 40px;
        min-height: 40px;
        justify-content: center;
    }
    
    .code-language {
        font-size: 12px;
    }
}


/* ===== Custom Dialog System ===== */
.custom-dialog-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    padding: 20px;
    will-change: opacity;
}

.custom-dialog-overlay.show {
    opacity: 1;
    visibility: visible;
}

.custom-dialog {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 28px;
    max-width: 400px;
    width: 100%;
    text-align: center;
    transform: scale(0.95) translateY(10px);
    opacity: 0;
    transition: transform 0.2s ease-out, opacity 0.2s ease-out;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.custom-dialog.show {
    transform: scale(1) translateY(0);
    opacity: 1;
}

.custom-dialog-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
}

.custom-dialog-icon svg {
    width: 28px;
    height: 28px;
}

.custom-dialog-icon.info { color: #3b82f6; background: rgba(59, 130, 246, 0.15); }
.custom-dialog-icon.success { color: #10b981; background: rgba(16, 185, 129, 0.15); }
.custom-dialog-icon.warning { color: #f59e0b; background: rgba(245, 158, 11, 0.15); }
.custom-dialog-icon.error { color: #ef4444; background: rgba(239, 68, 68, 0.15); }
.custom-dialog-icon.confirm { color: #8b5cf6; background: rgba(139, 92, 246, 0.15); }

.custom-dialog-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.custom-dialog-message {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.custom-dialog-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.dialog-btn {
    padding: 12px 24px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s ease, transform 0.15s ease;
    border: none;
    min-width: 100px;
    position: relative;
    overflow: hidden;
}

.dialog-btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.dialog-btn-secondary:hover {
    background: var(--bg-hover);
    transform: translateY(-1px);
}

.dialog-btn-primary {
    background: var(--accent);
    color: white;
}

.dialog-btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(62, 180, 137, 0.3);
}

.dialog-btn-primary.warning {
    background: #f59e0b;
}

.dialog-btn-primary.warning:hover {
    background: #d97706;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.dialog-btn-primary.error {
    background: #ef4444;
}

.dialog-btn-primary.error:hover {
    background: #dc2626;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

/* ===== Toast Notifications ===== */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 10001;
    display: flex;
    flex-direction: column;
    gap: 12px;
    pointer-events: none;
}

.toast {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    transform: translateX(100%);
    opacity: 0;
    transition: transform 0.2s ease-out, opacity 0.2s ease-out;
    pointer-events: auto;
    max-width: 360px;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-info { border-left: 4px solid #3b82f6; }
.toast-success { border-left: 4px solid #10b981; }
.toast-warning { border-left: 4px solid #f59e0b; }
.toast-error { border-left: 4px solid #ef4444; }

.toast-message {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
    line-height: 1.4;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-tertiary);
    font-size: 20px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    transition: color 0.2s;
}

.toast-close:hover {
    color: var(--text-primary);
}

/* Performance: Remove global transitions - they cause lag */
/* Individual elements have their own optimized transitions */

/* ===== Additional Smooth Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes mathGlow {
    0%, 100% {
        box-shadow: 0 0 0 rgba(102, 126, 234, 0);
    }
    50% {
        box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
    }
}

/* Math block entrance animation */
.math-block {
    animation: fadeInUp 0.4s ease-out;
}

.math-inline {
    animation: fadeIn 0.3s ease-out;
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

/* Button hover effects */
button:not(:disabled) {
    position: relative;
    overflow: hidden;
}

button:not(:disabled)::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

button:not(:disabled):active::after {
    width: 300px;
    height: 300px;
}

/* Smooth hover animations */
.btn-new-chat:hover,
.chat-item:hover,
.suggestion-card:hover,
.model-option:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-send:not(:disabled):hover {
    box-shadow: 0 0 20px rgba(62, 180, 137, 0.4);
}

/* Loading shimmer effect */
.loading-shimmer {
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* GPU Acceleration for smooth scrolling */
/* Optimized containment for scroll performance */
.chat-container,
.chat-list {
    contain: layout style;
}

.messages {
    contain: content;
}

/* Reduce paint during scroll */
.message,
.chat-item {
    contain: layout style paint;
}

/* Enhanced focus states */
*:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Smooth page transitions */
.app {
    animation: fadeIn 0.3s ease-in-out;
}

/* Chat items - no animation for performance */
.chat-item {
    opacity: 1;
}

.chat-item:nth-child(1) { animation-delay: 0.05s; }
.chat-item:nth-child(2) { animation-delay: 0.1s; }
.chat-item:nth-child(3) { animation-delay: 0.15s; }
.chat-item:nth-child(4) { animation-delay: 0.2s; }
.chat-item:nth-child(5) { animation-delay: 0.25s; }

/* Attachment items - simplified */
.attachment-item {
    opacity: 1;
}

/* ===== Mobile Toast Position ===== */
@media (max-width: 768px) {
    .toast-container {
        bottom: calc(90px + var(--mobile-safe-bottom, 0px));
        right: 16px;
        left: 16px;
    }
    
    .toast {
        max-width: 100%;
        border-radius: 16px;
        padding: 16px 20px;
    }
    
    .toast-message {
        font-size: 15px;
    }
    
    .custom-dialog-overlay {
        padding: 16px;
    }
    
    .custom-dialog {
        padding: 28px 24px;
        border-radius: 24px;
        max-width: 100%;
    }
    
    .custom-dialog-icon {
        width: 56px;
        height: 56px;
        margin-bottom: 20px;
    }
    
    .custom-dialog-icon svg {
        width: 28px;
        height: 28px;
    }
    
    .custom-dialog-title {
        font-size: 20px;
        margin-bottom: 12px;
    }
    
    .custom-dialog-message {
        font-size: 15px;
        margin-bottom: 28px;
    }
    
    .custom-dialog-actions {
        flex-direction: column-reverse;
        gap: 10px;
    }
    
    .dialog-btn {
        padding: 16px 24px;
        font-size: 16px;
        border-radius: 14px;
        width: 100%;
        min-height: 52px;
    }
}


/* ===== Model Selector Dropdown - Premium Desktop Design ===== */
.model-selector {
    position: relative;
    z-index: 1000;
}

.model-selector-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    min-width: 160px;
}

.model-selector-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    transform: translateY(-1px);
}

.model-selector.open .model-selector-btn {
    background: var(--bg-tertiary);
    border-color: var(--accent);
    box-shadow: 0 4px 20px rgba(62, 180, 137, 0.15);
}

.model-name {
    flex: 1;
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: left;
}

.model-chevron {
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0.7;
    flex-shrink: 0;
}

.model-selector.open .model-chevron {
    transform: rotate(180deg);
    opacity: 1;
}

/* Premium Dropdown Panel */
.model-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    min-width: 320px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 8px;
    box-shadow: 
        0 4px 6px rgba(0, 0, 0, 0.05),
        0 10px 20px rgba(0, 0, 0, 0.1),
        0 25px 50px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.98);
    transform-origin: top left;
    transition: 
        transform 0.2s cubic-bezier(0.4, 0, 0.2, 1),
        opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1),
        visibility 0.2s;
    z-index: 9999;
}

.model-selector.open .model-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.model-dropdown-header {
    padding: 12px 16px 10px;
    font-size: 11px;
    font-weight: 700;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 8px;
}

/* Premium Model Option Cards */
.model-option {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    margin: 4px 0;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    background: transparent;
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.model-option::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.2s ease;
    border-radius: 12px;
}

.model-option:hover {
    background: var(--bg-tertiary);
    border-color: var(--border);
    transform: translateX(4px);
}

.model-option:hover::before {
    opacity: 0.03;
}

.model-option.active {
    background: var(--bg-tertiary);
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent), inset 0 0 0 1px rgba(62, 180, 137, 0.1);
}

.model-option.active::before {
    opacity: 0.08;
}

.model-option-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: relative;
    z-index: 1;
}

.model-option-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.model-option.active .model-option-name {
    color: var(--accent);
}

.model-option-desc {
    font-size: 12px;
    color: var(--text-tertiary);
    line-height: 1.4;
}

/* Premium Checkmark */
.model-check {
    color: var(--accent);
    opacity: 0;
    transform: scale(0.5) rotate(-10deg);
    transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    z-index: 1;
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    background: rgba(62, 180, 137, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
}

.model-option.active .model-check {
    opacity: 1;
    transform: scale(1) rotate(0deg);
    background: rgba(62, 180, 137, 0.15);
}

/* Light Theme Premium Styling */
[data-theme="light"] .model-selector-btn {
    background: #ffffff;
    border-color: #e2e8f0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .model-selector-btn:hover {
    background: #f8fafc;
    border-color: #10b981;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .model-selector.open .model-selector-btn {
    background: #f8fafc;
    border-color: #10b981;
    box-shadow: 0 4px 20px rgba(16, 185, 129, 0.12);
}

[data-theme="light"] .model-dropdown {
    background: #ffffff;
    border-color: #e2e8f0;
    box-shadow: 
        0 4px 6px rgba(0, 0, 0, 0.04),
        0 10px 20px rgba(0, 0, 0, 0.06),
        0 25px 50px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .model-dropdown-header {
    border-bottom-color: #e2e8f0;
}

[data-theme="light"] .model-option:hover {
    background: #f1f5f9;
    border-color: #e2e8f0;
}

[data-theme="light"] .model-option.active {
    background: #ecfdf5;
    border-color: #10b981;
    box-shadow: 0 0 0 1px #10b981, inset 0 0 0 1px rgba(16, 185, 129, 0.1);
}

[data-theme="light"] .model-option.active .model-option-name {
    color: #059669;
}

[data-theme="light"] .model-check {
    color: #10b981;
    background: rgba(16, 185, 129, 0.1);
}

[data-theme="light"] .model-option.active .model-check {
    background: rgba(16, 185, 129, 0.15);
}

/* Mobile adjustments for model selector */
@media (max-width: 768px) {
    .model-selector-btn {
        padding: 8px 12px;
        font-size: 15px;
        border-radius: 10px;
        min-width: auto;
    }
    
    .model-name {
        max-width: 100px;
    }
    
    .model-dropdown {
        position: fixed;
        left: 16px;
        right: 16px;
        top: auto;
        bottom: calc(16px + var(--mobile-safe-bottom, 0px));
        min-width: auto;
        width: auto;
        border-radius: 20px;
        padding: 12px;
        max-height: 70vh;
        overflow-y: auto;
    }
    
    .model-dropdown-header {
        padding: 12px 16px;
        font-size: 12px;
    }
    
    .model-option {
        padding: 16px;
        border-radius: 14px;
        min-height: 60px;
    }
    
    .model-option-name {
        font-size: 16px;
    }
    
    .model-option-desc {
        font-size: 13px;
        margin-top: 2px;
    }
    
    .model-check {
        width: 24px;
        height: 24px;
    }
}

@media (max-width: 480px) {
    .model-selector-btn {
        padding: 6px 10px;
        font-size: 14px;
    }
    
    .model-name {
        max-width: 80px;
    }
    
    .model-dropdown {
        left: 12px;
        right: 12px;
        bottom: calc(12px + var(--mobile-safe-bottom, 0px));
    }
    
    .model-option {
        padding: 14px;
        min-height: 56px;
    }
    
    .model-option-name {
        font-size: 15px;
    }
}

/* ===== Message Edit Button ===== */
.msg-edit-btn {
    position: absolute;
    top: 8px;
    right: -36px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 5px;
    box-sizing: content-box;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-tertiary);
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s ease;
}

.msg-edit-btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.message.user:hover .msg-edit-btn {
    opacity: 1;
}

.msg-edit-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--accent);
}

.msg-edit-btn:active {
    transform: scale(0.95);
}

/* Position adjustment for user messages */
.message.user .message-bubble {
    position: relative;
}

/* ===== Version Navigation ===== */
.version-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}

.version-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.version-btn:hover:not(:disabled) {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
    transform: scale(1.05);
}

.version-btn:active:not(:disabled) {
    transform: scale(0.95);
}

.version-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.version-info {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    min-width: 50px;
    text-align: center;
    -webkit-user-select: none;
    user-select: none;
}

/* ===== Edit Modal ===== */
.edit-modal {
    max-width: 600px;
    width: 95%;
}

.edit-modal h3 {
    margin-bottom: 16px;
    font-size: 18px;
    font-weight: 600;
}

.edit-modal textarea {
    width: 100%;
    min-height: 120px;
    max-height: 300px;
    padding: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    line-height: 1.5;
    resize: vertical;
    margin-bottom: 16px;
}

.edit-modal textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(62, 180, 137, 0.15);
}

.edit-modal textarea::placeholder {
    color: var(--text-tertiary);
}

/* ===== Mobile Responsive - Edit & Version ===== */
@media (max-width: 768px) {
    .msg-edit-btn {
        opacity: 1;
        position: relative;
        top: auto;
        right: auto;
        width: auto;
        height: 40px;
        padding: 10px 16px;
        margin-top: 10px;
        border-radius: 12px;
        font-size: 13px;
        display: inline-flex;
    }
    
    .msg-edit-btn svg {
        width: 16px;
        height: 16px;
    }
    
    .version-nav {
        gap: 10px;
        margin-top: 16px;
        padding-top: 14px;
        justify-content: center;
    }
    
    .version-btn {
        width: 44px;
        height: 44px;
        border-radius: 12px;
    }
    
    .version-btn svg {
        width: 18px;
        height: 18px;
    }
    
    .version-info {
        font-size: 15px;
        min-width: 60px;
        font-weight: 600;
    }
    
    .edit-modal {
        padding: 24px;
        border-radius: 20px;
        max-width: 100%;
        margin: 16px;
    }
    
    .edit-modal h3 {
        font-size: 18px;
        margin-bottom: 20px;
    }
    
    .edit-modal textarea {
        min-height: 120px;
        font-size: 16px;
        padding: 14px;
        border-radius: 12px;
    }
}

/* Long press visual feedback - Enhanced */
.message.long-press-active {
    transform: scale(0.97);
    transition: transform 0.15s ease, opacity 0.15s ease;
}

.message.long-press-active .message-bubble {
    box-shadow: 0 0 0 2px var(--accent), 0 4px 20px rgba(62, 180, 137, 0.3);
    border-radius: 18px;
}

.message.long-press-active .message-content {
    box-shadow: 0 0 0 2px var(--accent);
}

/* Prevent text selection during touch on mobile */
@media (max-width: 768px) {
    .message {
        -webkit-touch-callout: none;
        -webkit-user-select: none;
        user-select: none;
    }
    
    .message .message-content {
        -webkit-touch-callout: none;
        -webkit-user-select: none;
        user-select: none;
    }
}

/* Action sheet is controlled by JS touch detection */


/* ===== PWA Mobile Navigation Support - Android & iOS ===== */

/* PWA Standalone Mode Detection */
@media all and (display-mode: standalone) {
    /* Ensure full viewport usage in standalone mode */
    html, body {
        height: 100%;
        overflow: hidden;
        position: fixed;
        width: 100%;
    }
    
    .app {
        height: 100vh;
        height: 100dvh;
        height: -webkit-fill-available;
    }
    
    /* Hide desktop download button in PWA mode - user already has the app */
    .btn-download {
        display: none !important;
    }
}

/* iOS PWA Specific Styles */
@supports (-webkit-touch-callout: none) {
    /* iOS safe area handling */
    html {
        height: -webkit-fill-available;
    }
    
    body {
        min-height: -webkit-fill-available;
        min-height: 100dvh;
    }
    
    .app {
        min-height: -webkit-fill-available;
        min-height: 100dvh;
    }
}

/* ===== Native-like Navigation Gestures ===== */

/* Prevent overscroll/bounce on iOS */
html {
    overscroll-behavior: none;
    -webkit-overflow-scrolling: touch;
}

body {
    overscroll-behavior: none;
    overscroll-behavior-y: none;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-x pan-y;
}

/* Main app container - prevent scroll bounce */
.app {
    overscroll-behavior: contain;
    touch-action: pan-y;
    -webkit-overflow-scrolling: touch;
}

/* Chat container - allow smooth scrolling with native feel */
.chat-container {
    overscroll-behavior-y: contain;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    touch-action: pan-y;
}

/* ===== Android Back Button / Gesture Support ===== */

/* Navigation state management via CSS */
.app[data-nav-state="sidebar-open"] .sidebar-overlay {
    display: block;
    opacity: 1;
}

.app[data-nav-state="modal-open"] .modal,
.app[data-nav-state="modal-open"] .custom-dialog-overlay {
    pointer-events: auto;
}

/* ===== iOS Swipe Navigation Support ===== */

/* Edge swipe gesture zones */
.swipe-edge-left,
.swipe-edge-right {
    position: fixed;
    top: 0;
    bottom: 0;
    width: 20px;
    z-index: 9999;
    touch-action: pan-x;
}

.swipe-edge-left {
    left: 0;
}

.swipe-edge-right {
    right: 0;
}

/* Sidebar swipe gesture support */
.sidebar {
    touch-action: pan-x;
}

/* ===== Pull-to-Refresh Prevention ===== */

/* Prevent pull-to-refresh on the main container */
.main {
    overscroll-behavior-y: contain;
}

/* Allow pull-to-refresh only on chat container when at top */
.chat-container {
    overscroll-behavior-y: auto;
}

/* ===== Safe Area Insets - Full Support ===== */

:root {
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-left: env(safe-area-inset-left, 0px);
    --safe-area-right: env(safe-area-inset-right, 0px);
}

/* Apply safe areas to key elements */
@media (max-width: 768px) {
    /* Header with safe area */
    .header {
        padding-top: max(12px, var(--safe-area-top));
        min-height: calc(var(--header-height) + var(--safe-area-top));
    }
    
    /* Input area with safe area */
    .input-area {
        padding-bottom: max(12px, calc(12px + var(--safe-area-bottom)));
    }
    
    /* Sidebar with safe areas */
    .sidebar {
        padding-top: var(--safe-area-top);
        padding-left: var(--safe-area-left);
    }
    
    .sidebar-footer {
        padding-bottom: max(16px, calc(16px + var(--safe-area-bottom)));
    }
    
    /* Modal safe areas */
    .modal-content {
        margin-top: var(--safe-area-top);
        margin-bottom: var(--safe-area-bottom);
    }
    
    /* Context menu (bottom sheet) safe area */
    .context-menu {
        padding-bottom: max(8px, calc(8px + var(--safe-area-bottom)));
    }
    
    /* Documentation modal safe areas */
    .docs-modal-header {
        padding-top: max(16px, calc(16px + var(--safe-area-top)));
    }
    
    .docs-modal-content {
        padding-bottom: max(20px, calc(20px + var(--safe-area-bottom)));
    }
}

/* ===== iOS Home Indicator Area ===== */

@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .input-area {
        padding-bottom: calc(12px + env(safe-area-inset-bottom));
    }
    
    .sidebar-footer {
        padding-bottom: calc(16px + env(safe-area-inset-bottom));
    }
    
    .context-menu {
        padding-bottom: calc(8px + env(safe-area-inset-bottom));
    }
    
    .model-dropdown {
        bottom: calc(12px + env(safe-area-inset-bottom));
    }
}

/* ===== Android Navigation Bar Support ===== */

/* Android 3-button navigation */
@media (max-width: 768px) {
    /* Ensure content doesn't overlap with Android nav bar */
    .app {
        padding-bottom: env(safe-area-inset-bottom, 0px);
    }
}

/* ===== Gesture Navigation Visual Feedback ===== */

/* Swipe indicator for sidebar */
.sidebar-swipe-indicator {
    position: absolute;
    right: -4px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 60px;
    background: var(--accent);
    border-radius: 2px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.sidebar.swiping .sidebar-swipe-indicator {
    opacity: 0.5;
}

/* Back gesture indicator */
.back-gesture-indicator {
    position: fixed;
    left: 0;
    top: 50%;
    transform: translateY(-50%) translateX(-100%);
    width: 40px;
    height: 40px;
    background: var(--bg-elevated);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 10000;
    opacity: 0;
    transition: transform 0.2s ease, opacity 0.2s ease;
    pointer-events: none;
}

.back-gesture-indicator.active {
    transform: translateY(-50%) translateX(20px);
    opacity: 1;
}

.back-gesture-indicator svg {
    width: 24px;
    height: 24px;
    color: var(--text-primary);
}

/* ===== Native-like Haptic Feedback Styles ===== */

/* Button press states with native feel */
.btn-new-chat:active,
.btn-send:active,
.btn-icon:active,
.btn-attach:active,
.chat-item:active,
.suggestion-card:active,
.msg-action-btn:active {
    transform: scale(0.96);
    transition: transform 0.1s ease;
}

/* ===== Mobile Action Sheet (iOS Style) ===== */

.mobile-action-sheet-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 10001;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.mobile-action-sheet-overlay.show {
    opacity: 1;
    visibility: visible;
}

.mobile-action-sheet {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-radius: 20px 20px 0 0;
    padding: 8px;
    padding-bottom: calc(8px + env(safe-area-inset-bottom, 0px));
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1);
    max-height: 70vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.mobile-action-sheet-overlay.show .mobile-action-sheet {
    transform: translateY(0);
}

.mobile-action-sheet-handle {
    width: 36px;
    height: 5px;
    background: var(--border);
    border-radius: 3px;
    margin: 8px auto 16px;
}

.mobile-action-sheet-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 8px 16px;
    text-align: center;
}

.mobile-action-sheet-content {
    padding: 8px;
}

.mobile-action-sheet-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: transparent;
    border: none;
    border-radius: 14px;
    color: var(--text-primary);
    font-size: 17px;
    font-weight: 400;
    cursor: pointer;
    width: 100%;
    text-align: left;
    transition: background 0.15s ease;
    font-family: inherit;
}

.mobile-action-sheet-item:active {
    background: var(--bg-hover);
}

.mobile-action-sheet-item svg {
    width: 24px;
    height: 24px;
    color: var(--accent);
    flex-shrink: 0;
}

.mobile-action-sheet-item.destructive {
    color: var(--error);
}

.mobile-action-sheet-item.destructive svg {
    color: var(--error);
}

.mobile-action-sheet-divider {
    height: 1px;
    background: var(--border);
    margin: 8px 16px;
}

.mobile-action-sheet-cancel {
    display: block;
    width: calc(100% - 16px);
    margin: 8px;
    padding: 16px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: 14px;
    color: var(--accent);
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    font-family: inherit;
    transition: background 0.15s ease;
}

.mobile-action-sheet-cancel:active {
    background: var(--bg-hover);
}

/* Light theme adjustments for mobile action sheet */
[data-theme="light"] .mobile-action-sheet {
    background: #ffffff;
    box-shadow: 0 -4px 30px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .mobile-action-sheet-cancel {
    background: #f1f5f9;
    color: #10b981;
}

[data-theme="light"] .mobile-action-sheet-cancel:active {
    background: #e2e8f0;
}

[data-theme="light"] .mobile-action-sheet-item svg {
    color: #10b981;
}

[data-theme="light"] .message.long-press-active .message-bubble {
    box-shadow: 0 0 0 2px #10b981, 0 4px 20px rgba(16, 185, 129, 0.3);
}

[data-theme="light"] .message.long-press-active .message-content {
    box-shadow: 0 0 0 2px #10b981;
}

/* Hide desktop action buttons on mobile - show action sheet instead */
@media (max-width: 768px) {
    .msg-actions {
        display: none !important;
    }
    
    .msg-edit-btn {
        display: none !important;
    }
}

/* ===== iOS-style Navigation Transitions ===== */

/* Page transition animations */
@keyframes slideInFromRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutToRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

@keyframes slideInFromLeft {
    from {
        transform: translateX(-30%);
        opacity: 0.5;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutToLeft {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(-30%);
        opacity: 0.5;
    }
}

/* Navigation transition classes */
.nav-transition-enter {
    animation: slideInFromRight 0.35s cubic-bezier(0.32, 0.72, 0, 1) forwards;
}

.nav-transition-exit {
    animation: slideOutToRight 0.35s cubic-bezier(0.32, 0.72, 0, 1) forwards;
}

.nav-transition-enter-back {
    animation: slideInFromLeft 0.35s cubic-bezier(0.32, 0.72, 0, 1) forwards;
}

.nav-transition-exit-back {
    animation: slideOutToLeft 0.35s cubic-bezier(0.32, 0.72, 0, 1) forwards;
}

/* ===== Rubber Band Scrolling Effect (iOS-like) ===== */

.chat-container {
    scroll-snap-type: y proximity;
}

/* ===== Touch Highlight Removal ===== */

* {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

/* Allow text selection where needed */
.message-content,
.code-content,
#messageInput {
    -webkit-touch-callout: default;
    -webkit-user-select: text;
    user-select: text;
}

/* ===== Momentum Scrolling ===== */

.chat-list,
.chat-container,
.docs-modal-content,
.mobile-action-sheet {
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
}

/* ===== Keyboard Handling ===== */

/* CSS custom property for keyboard height - set by JavaScript */
:root {
    --keyboard-height: 0px;
    --viewport-height: 100vh;
}

/* Prevent body scroll when keyboard is open on mobile */
html.keyboard-open,
body.keyboard-open {
    overflow: hidden !important;
    position: fixed !important;
    width: 100% !important;
    height: 100% !important;
}

/* Base keyboard-open styles for all devices */
.app.keyboard-open {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    height: 100% !important;
    overflow: hidden !important;
}

.app.keyboard-open .main {
    display: flex;
    flex-direction: column;
    height: 100% !important;
    max-height: 100% !important;
    overflow: hidden !important;
}

.app.keyboard-open .chat-container {
    flex: 1;
    overflow-y: auto !important;
    overflow-x: hidden !important;
    -webkit-overflow-scrolling: touch;
}

.app.keyboard-open .input-area {
    position: relative !important;
    bottom: auto !important;
    top: auto !important;
    left: auto !important;
    right: auto !important;
    flex-shrink: 0 !important;
    z-index: 100;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

/* Hide welcome screen when keyboard is open to prevent overlap */
.app.keyboard-open .welcome {
    display: none !important;
}

/* Mobile-specific keyboard adjustments */
@media (max-width: 768px) {
    .app.keyboard-open .header {
        flex-shrink: 0;
    }
    
    .app.keyboard-open .messages {
        padding-bottom: 20px;
    }
}

/* Touch device optimizations */
@media (pointer: coarse) {
    .input-area .btn-attach,
    .input-area .btn-send {
        min-width: 44px;
        min-height: 44px;
    }
    
    #messageInput {
        font-size: 16px !important; /* Prevents iOS zoom on focus */
    }
    
    .input-container {
        transition: border-color 0.15s ease, box-shadow 0.15s ease;
    }
    
    .input-container:focus-within {
        border-color: var(--accent);
        box-shadow: 0 0 0 3px rgba(62, 180, 137, 0.15);
    }
    
    .chat-container {
        scroll-behavior: smooth;
        -webkit-overflow-scrolling: touch;
    }
}

/* Tablet touch optimizations */
@media (min-width: 481px) and (max-width: 1024px) and (pointer: coarse) {
    .input-container {
        min-height: 52px;
        padding: 10px 14px;
    }
    
    .btn-attach,
    .btn-send {
        min-width: 44px;
        min-height: 44px;
    }
}

/* Visual Viewport API support */
@supports (height: 100dvh) {
    .app {
        height: 100dvh;
    }
    
    .sidebar {
        height: 100dvh;
    }
    
    .main {
        height: 100dvh;
    }
}

/* ===== Enhanced Touch Device Input Handling ===== */

/* Smooth transitions for chat container during keyboard changes */
.chat-container {
    transition: padding-bottom 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: padding-bottom;
}

/* ===== Notch/Dynamic Island Support (iPhone) ===== */

@media (max-width: 768px) {
    /* Landscape with notch */
    @media (orientation: landscape) {
        .header {
            padding-left: max(12px, var(--safe-area-left));
            padding-right: max(12px, var(--safe-area-right));
        }
        
        .input-area {
            padding-left: max(16px, var(--safe-area-left));
            padding-right: max(16px, var(--safe-area-right));
        }
        
        .messages {
            padding-left: max(16px, var(--safe-area-left));
            padding-right: max(16px, var(--safe-area-right));
        }
    }
}

/* ===== Android Material You Ripple Effect ===== */

.ripple-effect {
    position: relative;
    overflow: hidden;
}

.ripple-effect::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: width 0.4s ease, height 0.4s ease, opacity 0.4s ease;
}

.ripple-effect:active::after {
    width: 200%;
    height: 200%;
    opacity: 0;
}

[data-theme="light"] .ripple-effect::after {
    background: rgba(0, 0, 0, 0.1);
}

/* ===== Smooth Scroll Snap for Chat ===== */

@media (max-width: 768px) {
    .messages {
        scroll-padding-top: 20px;
        scroll-padding-bottom: 20px;
    }
}

/* ===== PWA Install Prompt Styles ===== */

.pwa-install-prompt {
    position: fixed;
    bottom: calc(20px + env(safe-area-inset-bottom, 0px));
    left: 16px;
    right: 16px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    z-index: 9999;
    transform: translateY(150%);
    transition: transform 0.4s cubic-bezier(0.32, 0.72, 0, 1);
}

.pwa-install-prompt.show {
    transform: translateY(0);
}

.pwa-install-prompt-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.pwa-install-prompt-icon svg {
    width: 28px;
    height: 28px;
    color: white;
}

.pwa-install-prompt-content {
    flex: 1;
}

.pwa-install-prompt-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.pwa-install-prompt-desc {
    font-size: 14px;
    color: var(--text-secondary);
}

.pwa-install-prompt-actions {
    display: flex;
    gap: 8px;
}

.pwa-install-btn {
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
}

.pwa-install-btn.primary {
    background: var(--accent);
    color: white;
}

.pwa-install-btn.primary:active {
    transform: scale(0.96);
}

.pwa-install-btn.secondary {
    background: transparent;
    color: var(--text-secondary);
}

/* ===== Orientation Lock Indicator ===== */

.orientation-lock-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    z-index: 99999;
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 20px;
    padding: 40px;
    text-align: center;
}

.orientation-lock-overlay svg {
    width: 64px;
    height: 64px;
    color: var(--accent);
    animation: rotatePhone 2s ease-in-out infinite;
}

@keyframes rotatePhone {
    0%, 100% { transform: rotate(0deg); }
    50% { transform: rotate(90deg); }
}

.orientation-lock-overlay p {
    font-size: 18px;
    color: var(--text-secondary);
}

/* Show orientation lock on small screens in landscape if needed */
@media (max-height: 400px) and (orientation: landscape) {
    /* Optional: Show rotation prompt for very small landscape views */
}

/* ===== Status Bar Styles (for themed status bar) ===== */

/* iOS status bar area */
@media (max-width: 768px) {
    .header::before {
        content: '';
        position: absolute;
        top: calc(-1 * var(--safe-area-top));
        left: 0;
        right: 0;
        height: var(--safe-area-top);
        background: var(--bg-primary);
        z-index: -1;
    }
}

/* ===== Prevent Text Selection on UI Elements ===== */

.header,
.sidebar,
.input-area,
.btn-new-chat,
.btn-send,
.btn-icon,
.btn-attach,
.chat-item,
.suggestion-card,
.model-selector,
.context-menu,
.modal,
.mobile-action-sheet {
    -webkit-user-select: none;
    user-select: none;
}

/* ===== Focus Visible for Accessibility ===== */

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

button:focus:not(:focus-visible),
input:focus:not(:focus-visible),
textarea:focus:not(:focus-visible) {
    outline: none;
}

/* ===== Visually Hidden (Screen Reader Only) ===== */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===== Reduced Motion Support ===== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .chat-container {
        scroll-behavior: auto;
    }
}

/* ===== Streaming Code Block Styles ===== */

/* Streaming code block indicator */
.code-block.streaming-code {
    position: relative;
}

.code-block.streaming-code .streaming-indicator {
    color: var(--accent);
    animation: modern-pulse 1.5s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    margin-left: auto;
    font-size: 10px;
    will-change: opacity, transform;
}

/* Modern pulse - smoother with subtle scale */
@keyframes modern-pulse {
    0%, 100% { 
        opacity: 1; 
        transform: scale(1);
    }
    50% { 
        opacity: 0.4; 
        transform: scale(0.95);
    }
}

@keyframes pulse-indicator {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* Blinking cursor in streaming code - modernized */
.code-cursor {
    color: var(--accent);
    animation: modern-cursor-blink 0.8s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    font-weight: bold;
    will-change: opacity;
}

@keyframes blink-cursor {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* Streaming inline code - modernized */
.streaming-inline {
    background: var(--bg-tertiary);
    border-right: 2px solid var(--accent);
    animation: modern-cursor-blink 0.8s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    will-change: opacity;
}

/* Streaming bold text - modernized */
.streaming-bold {
    border-right: 2px solid var(--text-primary);
    animation: modern-cursor-blink 0.8s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    will-change: opacity;
}

/* Streaming math styles - modernized */
.streaming-math {
    position: relative;
}

.streaming-math::after {
    content: '';
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: modern-pulse 1.5s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    will-change: opacity, transform;
}

.math-block.streaming-math {
    border-right: 3px solid var(--accent);
    animation: modern-math-glow 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    will-change: box-shadow;
}

.math-cursor {
    color: var(--accent);
    animation: modern-cursor-blink 0.8s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    font-weight: bold;
    margin-left: 4px;
    will-change: opacity;
}

/* Modern math streaming glow - smoother transition */
@keyframes modern-math-glow {
    0%, 100% { 
        box-shadow: 0 0 0 rgba(102, 126, 234, 0);
    }
    50% { 
        box-shadow: 0 0 20px rgba(102, 126, 234, 0.25);
    }
}

@keyframes math-streaming-glow {
    0%, 100% { 
        box-shadow: 0 0 0 rgba(102, 126, 234, 0);
    }
    50% { 
        box-shadow: 0 0 15px rgba(102, 126, 234, 0.3);
    }
}

/* Streaming content - ensure proper formatting during stream */
.streaming-content h1,
.streaming-content h2,
.streaming-content h3,
.streaming-content h4,
.streaming-content h5,
.streaming-content h6 {
    margin: 16px 0 8px 0;
}

.streaming-content h1:first-child,
.streaming-content h2:first-child,
.streaming-content h3:first-child {
    margin-top: 0;
}

.streaming-content ul {
    margin: 12px 0;
    padding-left: 24px;
    list-style: none;
}

.streaming-content ul > li {
    position: relative;
    padding-left: 4px;
}

.streaming-content ul > li::before {
    content: '';
    position: absolute;
    left: -16px;
    top: 9px;
    width: 5px;
    height: 5px;
    background: var(--accent);
    border-radius: 50%;
}

.streaming-content ol {
    margin: 12px 0;
    padding-left: 24px;
    list-style: decimal;
}

.streaming-content ol > li {
    margin: 10px 0;
    padding-left: 8px;
}

.streaming-content ol > li::marker {
    color: var(--accent);
    font-weight: 600;
}

.streaming-content li {
    margin: 6px 0;
    line-height: 1.6;
}

.streaming-content blockquote {
    margin: 12px 0;
    padding: 10px 16px;
    border-left: 3px solid var(--accent);
    background: rgba(102, 126, 234, 0.05);
    border-radius: 0 8px 8px 0;
}

.streaming-content p {
    margin: 0 0 12px 0;
    line-height: 1.7;
}

.streaming-content p:last-child {
    margin-bottom: 0;
}

.streaming-content .math-block {
    margin: 16px 0;
}

.streaming-content .math-inline {
    display: inline;
}

.streaming-content hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    margin: 20px 0;
    opacity: 0.5;
}

.streaming-content strong {
    font-weight: 600;
    color: var(--text-primary);
    font-size: inherit; /* Prevent font-size inheritance issues */
    display: inline; /* Ensure inline display */
}

.streaming-content em {
    font-style: italic;
    color: var(--text-secondary);
}

.streaming-content a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.streaming-content a:hover {
    border-bottom-color: var(--accent);
}

/* Streaming content container - GPU accelerated for smooth rendering */
.streaming-content {
    min-height: 20px;
    contain: content;
    will-change: contents;
}

/* Note: Main streaming code-block styles are in "Enhanced Code Block Streaming" section below */

[data-theme="light"] .code-cursor {
    color: var(--accent);
}

[data-theme="light"] .streaming-indicator {
    color: var(--accent);
}

/* ===== Markdown Tables ===== */
.table-wrapper {
    overflow-x: auto;
    margin: 20px 0;
    border-radius: 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    box-shadow: 
        0 4px 12px rgba(0, 0, 0, 0.15),
        0 2px 4px rgba(0, 0, 0, 0.1);
}

.markdown-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    min-width: 300px;
}

.markdown-table th,
.markdown-table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

.markdown-table th {
    background: linear-gradient(135deg, var(--accent) 0%, #764ba2 100%);
    font-weight: 600;
    color: #fff;
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 1px;
    position: sticky;
    top: 0;
    z-index: 1;
}

.markdown-table th:first-child {
    border-top-left-radius: 13px;
}

.markdown-table th:last-child {
    border-top-right-radius: 13px;
}

.markdown-table td {
    color: var(--text-primary);
    background: var(--bg-secondary);
    transition: background 0.15s ease;
}

.markdown-table tbody tr:nth-child(even) td {
    background: var(--bg-tertiary);
}

.markdown-table tbody tr:hover td {
    background: rgba(102, 126, 234, 0.1);
}

.markdown-table tbody tr:last-child td {
    border-bottom: none;
}

.markdown-table tbody tr:last-child td:first-child {
    border-bottom-left-radius: 13px;
}

.markdown-table tbody tr:last-child td:last-child {
    border-bottom-right-radius: 13px;
}

/* Table cell content formatting */
.markdown-table td code {
    background: rgba(102, 126, 234, 0.15);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12px;
}

.markdown-table td strong {
    color: var(--accent);
}

[data-theme="light"] .table-wrapper {
    background: #fff;
    border-color: #e2e8f0;
    box-shadow: 
        0 4px 12px rgba(0, 0, 0, 0.08),
        0 2px 4px rgba(0, 0, 0, 0.04);
}

[data-theme="light"] .markdown-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

[data-theme="light"] .markdown-table td {
    background: #fff;
}

[data-theme="light"] .markdown-table tbody tr:nth-child(even) td {
    background: #f8fafc;
}

[data-theme="light"] .markdown-table tbody tr:hover td {
    background: rgba(102, 126, 234, 0.08);
}

/* ===== Streaming Tables ===== */
.streaming-table {
    position: relative;
}

.streaming-table.incomplete {
    opacity: 0.9;
}

.streaming-table .streaming-cell {
    text-align: center !important;
    color: var(--text-secondary);
    font-style: italic;
    padding: 20px !important;
    background: var(--bg-secondary);
}

.streaming-table .streaming-indicator {
    color: var(--accent);
    animation: pulse-indicator 1s ease-in-out infinite;
    margin-right: 8px;
}

/* ===== Streaming Charts ===== */
.streaming-chart {
    position: relative;
}

.streaming-chart .chart-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.streaming-chart .chart-loading-icon {
    margin-bottom: 16px;
    animation: spin-chart 2s linear infinite;
}

.streaming-chart .chart-loading-icon svg {
    stroke: var(--accent);
}

.streaming-chart .chart-loading-text {
    font-size: 14px;
    margin-bottom: 8px;
}

.streaming-chart .streaming-indicator {
    color: var(--accent);
    animation: pulse-indicator 1s ease-in-out infinite;
    font-size: 12px;
}

@keyframes spin-chart {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ===== Charts ===== */
.chart-container {
    margin: 20px 0;
    padding: 20px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.chart-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    text-align: center;
}

.chart-canvas {
    display: block;
    width: 100%;
}

.chart-legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.chart-legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.chart-legend-color {
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

[data-theme="light"] .chart-container {
    background: #fff;
    border-color: #e2e8f0;
}

@media (max-width: 768px) {
    .table-wrapper { margin: 12px 0; border-radius: 10px; }
    .markdown-table { font-size: 13px; min-width: 300px; }
    .markdown-table th, .markdown-table td { padding: 10px 12px; }
    .chart-container { margin: 16px 0; padding: 16px; }
    .chart-title { font-size: 14px; }
    .chart-legend { gap: 12px; }
    .chart-legend-item { font-size: 12px; }
}


/* ===== CRITICAL: Force Code Block Line Wrapping ===== */
/* This ensures all code blocks wrap text instead of horizontal scrolling */
.code-block,
.code-content,
.code-content code,
.message-content pre,
.message-content pre code,
.streaming-content .code-content,
.streaming-content .code-content code {
    white-space: pre-wrap !important;
    word-wrap: break-word !important;
    word-break: break-word !important;
    overflow-wrap: break-word !important;
    overflow-x: hidden !important;
    max-width: 100% !important;
}

.code-block {
    width: 100% !important;
    box-sizing: border-box !important;
}

.code-content {
    width: 100% !important;
    box-sizing: border-box !important;
}

.code-content code {
    width: 100% !important;
    display: block !important;
}


/* ===== Enhanced Math Rendering During Streaming ===== */

/* Math block with proper KaTeX rendering */
.streaming-content .math-block {
    display: block;
    margin: 16px 0;
    padding: 16px 20px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.08) 0%, rgba(118, 75, 162, 0.08) 100%);
    border-radius: 10px;
    border-left: 3px solid var(--accent);
    overflow-x: auto;
    text-align: center;
}

.streaming-content .math-block .katex-display {
    margin: 0;
    padding: 0;
}

.streaming-content .math-block .katex {
    font-size: 1.2em;
    color: var(--text-primary);
}

.streaming-content .math-inline {
    display: inline;
    padding: 2px 5px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 4px;
    vertical-align: middle;
}

.streaming-content .math-inline .katex {
    font-size: 1em;
}

/* Streaming math with cursor */
.streaming-content .math-block.streaming-math {
    border-right: 3px solid var(--accent);
    animation: math-pulse 1.5s ease-in-out infinite;
}

.streaming-content .math-cursor {
    color: var(--accent);
    font-weight: bold;
    animation: blink 1s step-end infinite;
}

@keyframes math-pulse {
    0%, 100% { 
        border-right-color: var(--accent);
        box-shadow: 0 0 0 rgba(102, 126, 234, 0);
    }
    50% { 
        border-right-color: #764ba2;
        box-shadow: 0 0 10px rgba(102, 126, 234, 0.3);
    }
}

/* Math fallback styling */
.streaming-content .math-fallback {
    font-family: 'Times New Roman', 'Cambria Math', Georgia, serif;
    font-style: italic;
    letter-spacing: 0.5px;
}

.streaming-content .math-block.math-fallback {
    font-size: 1.1em;
    line-height: 1.7;
}

/* Light theme math in streaming */
[data-theme="light"] .streaming-content .math-block {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.12) 0%, rgba(118, 75, 162, 0.12) 100%);
}

[data-theme="light"] .streaming-content .math-inline {
    background: rgba(102, 126, 234, 0.15);
}

/* ===== Enhanced Code Block Streaming ===== */

/* Ensure code blocks have proper styling immediately during streaming */
.streaming-content .code-block {
    margin: 16px 0;
    border-radius: 10px;
    background: #1e293b;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.streaming-content .code-block .code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: #0f172a;
    border-bottom: 1px solid #334155;
}

.streaming-content .code-block .code-language {
    font-size: 12px;
    font-weight: 500;
    color: #94a3b8;
    text-transform: lowercase;
}

.streaming-content .code-block .code-copy-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 6px;
    color: #94a3b8;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.streaming-content .code-block .code-copy-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
}

.streaming-content .code-block .code-content {
    padding: 16px;
    overflow-x: auto;
}

.streaming-content .code-block .code-content code {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    line-height: 1.6;
    color: #e2e8f0;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Streaming code block indicator */
.streaming-content .code-block.streaming-code {
    position: relative;
}

.streaming-content .code-block.streaming-code::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), #764ba2, var(--accent));
    background-size: 200% 100%;
    animation: modern-streaming-gradient 2.5s linear infinite;
    will-change: background-position;
}

/* Modern streaming gradient - smoother flow */
@keyframes modern-streaming-gradient {
    0% { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

@keyframes streaming-gradient {
    0% { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

.streaming-content .code-block .streaming-indicator {
    color: var(--accent);
    animation: modern-pulse 1.5s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    font-size: 10px;
    will-change: opacity, transform;
}

.streaming-content .code-cursor {
    color: var(--accent);
    animation: modern-cursor-blink 0.8s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    font-weight: bold;
    will-change: opacity;
}

/* Light theme code blocks in streaming */
[data-theme="light"] .streaming-content .code-block {
    background: #f8fafc;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .streaming-content .code-block .code-header {
    background: #e2e8f0;
    border-bottom-color: #cbd5e1;
}

[data-theme="light"] .streaming-content .code-block .code-language {
    color: #64748b;
}

[data-theme="light"] .streaming-content .code-block .code-content code {
    color: #1e293b;
}

/* ===== Ensure Tables Render During Streaming ===== */

.streaming-content .table-wrapper {
    margin: 16px 0;
    overflow-x: auto;
    border-radius: 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
}

.streaming-content .markdown-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.streaming-content .markdown-table th,
.streaming-content .markdown-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

.streaming-content .markdown-table th {
    background: linear-gradient(135deg, var(--accent) 0%, #764ba2 100%);
    font-weight: 600;
    color: #fff;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.streaming-content .markdown-table td {
    background: var(--bg-secondary);
}

.streaming-content .markdown-table tbody tr:nth-child(even) td {
    background: var(--bg-tertiary);
}

/* ===== Blockquote Streaming Styles ===== */

.streaming-content blockquote {
    margin: 12px 0;
    padding: 12px 16px;
    background: rgba(102, 126, 234, 0.08);
    border-left: 4px solid var(--accent);
    border-radius: 0 8px 8px 0;
    color: var(--text-secondary);
    font-style: italic;
}

[data-theme="light"] .streaming-content blockquote {
    background: rgba(102, 126, 234, 0.1);
}

/* ===== Horizontal Rule Streaming ===== */

.streaming-content hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    margin: 20px 0;
    border-radius: 1px;
}

/* ===== Inline Code Streaming ===== */

.streaming-content code:not(.code-content code) {
    background: rgba(102, 126, 234, 0.15);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.9em;
    color: var(--accent);
}

.streaming-content code.streaming-inline {
    border-right: 2px solid var(--accent);
    animation: modern-border-blink 0.8s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    will-change: border-color;
}

/* Modern border blink - smooth fade */
@keyframes modern-border-blink {
    0%, 100% { border-right-color: var(--accent); }
    50% { border-right-color: transparent; }
}

@keyframes blink-border {
    0%, 100% { border-right-color: var(--accent); }
    50% { border-right-color: transparent; }
}

/* ===== Strong/Bold in Streaming ===== */

.streaming-content strong.streaming-bold {
    border-right: 2px solid var(--text-primary);
    animation: blink-border 1s step-end infinite;
}

/* ===== Underline in Streaming ===== */

.streaming-content u {
    text-decoration: underline;
    text-decoration-color: var(--accent);
    text-underline-offset: 2px;
}

/* ==================== IMAGE LIGHTBOX ==================== */

.image-lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.image-lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-image {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    transform: scale(0.9);
    transition: transform 0.2s ease;
}

.image-lightbox.active .lightbox-image {
    transform: scale(1);
}

.lightbox-close {
    position: absolute;
    top: -40px;
    right: -40px;
    width: 36px;
    height: 36px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease, transform 0.2s ease;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

/* Mobile lightbox adjustments */
@media (max-width: 768px) {
    .lightbox-close {
        top: 16px;
        right: 16px;
        background: rgba(0, 0, 0, 0.5);
    }
    
    .lightbox-content {
        max-width: 95vw;
    }
}

/* ===== DEEP RESEARCH FEATURE ===== */

/* DeepResearch Indicator on Messages */
.deep-research-indicator {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    background: linear-gradient(135deg, #059669 0%, #10b981 100%);
    color: white;
    border-radius: 12px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-left: 8px;
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
    animation: deepResearchPulse 2s ease-in-out infinite;
}

.deep-research-indicator svg {
    width: 12px;
    height: 12px;
}

@keyframes deepResearchPulse {
    0%, 100% {
        box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
    }
    50% {
        box-shadow: 0 2px 16px rgba(16, 185, 129, 0.5);
    }
}

/* DeepResearch Status in Typing Indicator */
.deep-research-status {
    color: #10b981 !important;
    font-weight: 500;
}

/* DeepResearch Notice Toast */
.toast.deep-research-toast {
    background: linear-gradient(135deg, #059669 0%, #10b981 100%);
    color: white;
}

.toast.deep-research-toast .toast-icon {
    background: rgba(255, 255, 255, 0.2);
}

/* DeepResearch Status Animation */
@keyframes deepResearchStatusPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* Enhanced Typing Indicator for DeepResearch */
.typing-indicator.deep-research-active {
    background: linear-gradient(135deg, rgba(5, 150, 105, 0.1) 0%, rgba(16, 185, 129, 0.1) 100%);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.typing-indicator.deep-research-active .typing-text {
    color: #10b981;
    font-weight: 500;
}

.typing-indicator.deep-research-active .typing-dots .typing-dot {
    background: #10b981;
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.4);
}

/* ===== VISION STATUS STYLES ===== */
/* Premium Vision Processing Status */
.vision-status {
    color: #8b5cf6 !important;
    font-weight: 500;
    animation: visionStatusPulse 2s ease-in-out infinite;
}

/* Vision Status Animation */
@keyframes visionStatusPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* Enhanced Typing Indicator for Vision Processing */
.typing-indicator.vision-active {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(167, 139, 250, 0.15) 100%);
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: 12px;
    padding: 12px 16px;
    position: relative;
    overflow: hidden;
}

.typing-indicator.vision-active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: var(--vision-progress, 0%);
    background: linear-gradient(90deg, rgba(139, 92, 246, 0.15) 0%, rgba(167, 139, 250, 0.2) 100%);
    transition: width 0.3s ease;
    z-index: 0;
}

.typing-indicator.vision-active .typing-text {
    color: #8b5cf6;
    font-weight: 500;
    position: relative;
    z-index: 1;
    opacity: 1;
    max-width: 300px;
}

.typing-indicator.vision-active .typing-dots {
    position: relative;
    z-index: 1;
}

.typing-indicator.vision-active .typing-dots .typing-dot {
    background: #8b5cf6;
    box-shadow: 0 0 8px rgba(139, 92, 246, 0.5);
    position: relative;
    z-index: 1;
}

/* Vision Eye Animation */
@keyframes visionEyePulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.typing-indicator.vision-active .typing-dots {
    animation: visionEyePulse 1.5s ease-in-out infinite;
}

/* Light theme adjustments */
[data-theme="light"] .vision-status {
    color: #7c3aed !important;
}

[data-theme="light"] .typing-indicator.vision-active {
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.08) 0%, rgba(139, 92, 246, 0.12) 100%);
    border-color: rgba(124, 58, 237, 0.25);
}

[data-theme="light"] .typing-indicator.vision-active::before {
    background: linear-gradient(90deg, rgba(124, 58, 237, 0.1) 0%, rgba(139, 92, 246, 0.15) 100%);
}

[data-theme="light"] .typing-indicator.vision-active .typing-text {
    color: #7c3aed;
}

[data-theme="light"] .typing-indicator.vision-active .typing-dots .typing-dot {
    background: #7c3aed;
    box-shadow: 0 0 8px rgba(124, 58, 237, 0.4);
}

/* ===== VISION STATUS RESPONSIVE STYLES ===== */
/* Tablet */
@media (max-width: 1024px) {
    .typing-indicator.vision-active {
        padding: 10px 14px;
        border-radius: 10px;
    }
    
    .typing-indicator.vision-active .typing-text {
        max-width: 250px;
        font-size: 12px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .typing-indicator.vision-active {
        padding: 8px 12px;
        border-radius: 8px;
        gap: 8px;
    }
    
    .typing-indicator.vision-active .typing-text {
        max-width: 180px;
        font-size: 11px;
    }
    
    .typing-indicator.vision-active .typing-dots .typing-dot {
        width: 6px;
        height: 6px;
    }
    
    .vision-status {
        font-size: 11px;
    }
}

/* Small mobile */
@media (max-width: 480px) {
    .typing-indicator.vision-active {
        padding: 6px 10px;
        border-radius: 6px;
        gap: 6px;
    }
    
    .typing-indicator.vision-active .typing-text {
        max-width: 130px;
        font-size: 10px;
    }
    
    .typing-indicator.vision-active .typing-dots .typing-dot {
        width: 5px;
        height: 5px;
    }
    
    .vision-status {
        font-size: 10px;
    }
}

/* ===== ATTACH MENU ===== */
.attach-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s;
}

.attach-menu.show {
    opacity: 1;
    visibility: visible;
}

.attach-menu-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.attach-menu-sheet {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-radius: 20px 20px 0 0;
    padding: 12px 16px calc(env(safe-area-inset-bottom, 16px) + 16px);
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1);
    max-height: 70vh;
    overflow-y: auto;
}

.attach-menu.show .attach-menu-sheet {
    transform: translateY(0);
}

.attach-menu-handle {
    width: 36px;
    height: 4px;
    background: var(--text-muted);
    opacity: 0.3;
    border-radius: 2px;
    margin: 0 auto 16px;
}

/* Grid Buttons */
.attach-menu-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}

.attach-grid-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.15s ease;
    color: var(--text-primary);
}

.attach-grid-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
}

.attach-grid-btn:active {
    transform: scale(0.96);
    background: var(--bg-secondary);
}

.attach-grid-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.attach-grid-icon svg {
    width: 100%;
    height: 100%;
}

.attach-grid-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

/* Menu Divider */
.attach-menu-divider {
    height: 1px;
    background: var(--border);
    margin: 8px 0;
}

/* List Items */
.attach-menu-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.attach-menu-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 12px;
    border-radius: 12px;
    cursor: pointer;
    transition: background 0.1s ease;
    color: var(--text-primary);
}

.attach-menu-item:hover {
    background: var(--bg-hover);
}

.attach-menu-item:active {
    background: var(--bg-tertiary);
}

.attach-item-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.attach-item-icon svg {
    width: 100%;
    height: 100%;
}

.attach-item-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.attach-item-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
}

.attach-item-desc {
    font-size: 13px;
    color: var(--text-muted);
}

.attach-menu-check {
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    color: var(--accent);
    transition: opacity 0.15s ease;
    flex-shrink: 0;
}

.attach-menu-check svg {
    width: 18px;
    height: 18px;
}

.attach-menu-item.active .attach-menu-check {
    opacity: 1;
}

.attach-menu-item.active .attach-item-icon {
    color: var(--accent);
}

.attach-menu-item.active .attach-item-title {
    color: var(--accent);
}

/* Attach button active state */
.btn-attach.active {
    background: var(--bg-hover);
    color: var(--accent);
}

/* Deep Research Active Indicator in Footer */
.deep-research-active-indicator {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: 16px;
    font-size: 12px;
    font-weight: 500;
    color: #10b981;
    margin-right: 8px;
}

.deep-research-active-indicator svg {
    width: 14px;
    height: 14px;
}

/* Light Theme */
[data-theme="light"] .attach-menu-overlay {
    background: rgba(0, 0, 0, 0.4);
}

[data-theme="light"] .attach-menu-sheet {
    background: #ffffff;
    box-shadow: 0 -4px 32px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .attach-grid-btn {
    background: #f8fafc;
    border-color: #e2e8f0;
}

[data-theme="light"] .attach-grid-btn:hover {
    background: #f1f5f9;
    border-color: #6366f1;
}

[data-theme="light"] .attach-grid-icon {
    color: #64748b;
}

[data-theme="light"] .attach-menu-item:hover {
    background: #f1f5f9;
}

[data-theme="light"] .attach-menu-item:active {
    background: #e2e8f0;
}

[data-theme="light"] .attach-item-icon {
    color: #64748b;
}

[data-theme="light"] .attach-menu-item.active .attach-item-icon,
[data-theme="light"] .attach-menu-item.active .attach-item-title {
    color: #059669;
}

[data-theme="light"] .attach-menu-check {
    color: #059669;
}

[data-theme="light"] .deep-research-active-indicator {
    background: rgba(5, 150, 105, 0.1);
    border-color: rgba(5, 150, 105, 0.3);
    color: #059669;
}

/* Desktop - Show as popup instead of bottom sheet */
@media (min-width: 769px) {
    .attach-menu {
        position: fixed;
    }
    
    .attach-menu-overlay {
        background: transparent;
        backdrop-filter: none;
    }
    
    .attach-menu-sheet {
        position: absolute;
        bottom: auto;
        left: auto;
        right: auto;
        top: auto;
        width: 320px;
        border-radius: 16px;
        padding: 12px;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
        border: 1px solid var(--border);
        transform: translateY(8px);
        opacity: 0;
        transition: transform 0.15s ease, opacity 0.15s ease;
    }
    
    .attach-menu.show .attach-menu-sheet {
        transform: translateY(0);
        opacity: 1;
    }
    
    .attach-menu-handle {
        display: none;
    }
    
    .attach-menu-grid {
        gap: 8px;
        margin-bottom: 12px;
    }
    
    .attach-grid-btn {
        padding: 14px 10px;
        border-radius: 12px;
    }
    
    .attach-grid-icon {
        width: 24px;
        height: 24px;
    }
    
    .attach-grid-label {
        font-size: 12px;
    }
    
    .attach-menu-item {
        padding: 12px 10px;
        border-radius: 10px;
    }
    
    .attach-item-title {
        font-size: 14px;
    }
    
    .attach-item-desc {
        font-size: 12px;
    }
}

/* PWA Standalone */
@media (display-mode: standalone) {
    .attach-menu-sheet {
        padding-bottom: calc(env(safe-area-inset-bottom, 16px) + 20px);
    }
}

/* ===== WEBCAM CAPTURE MODAL ===== */
/* Premium webcam capture for desktop devices */
.webcam-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s;
}

.webcam-modal.show {
    opacity: 1;
    visibility: visible;
}

.webcam-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.webcam-modal-content {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border);
    max-width: 640px;
    width: 90%;
    transform: scale(0.9) translateY(20px);
    transition: transform 0.3s ease;
}

.webcam-modal.show .webcam-modal-content {
    transform: scale(1) translateY(0);
}

.webcam-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-primary);
}

.webcam-header h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.webcam-close-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}

.webcam-close-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.webcam-close-btn svg {
    width: 18px;
    height: 18px;
}

.webcam-video-container {
    position: relative;
    background: #000;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.webcam-video-container video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scaleX(-1); /* Mirror for selfie view */
}

.webcam-loading {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    font-size: 14px;
}

.webcam-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: webcamSpin 1s linear infinite;
}

@keyframes webcamSpin {
    to { transform: rotate(360deg); }
}

.webcam-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    padding: 20px;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
}

.webcam-capture-btn {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    border: 4px solid var(--accent);
    background: transparent;
    cursor: pointer;
    position: relative;
    transition: all 0.15s ease;
}

.webcam-capture-btn:hover {
    transform: scale(1.05);
    border-color: #764ba2;
}

.webcam-capture-btn:active {
    transform: scale(0.95);
}

.capture-ring {
    position: absolute;
    top: 6px;
    left: 6px;
    right: 6px;
    bottom: 6px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #764ba2);
    transition: all 0.15s ease;
}

.webcam-capture-btn:hover .capture-ring {
    top: 4px;
    left: 4px;
    right: 4px;
    bottom: 4px;
}

.webcam-switch-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}

.webcam-switch-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.webcam-switch-btn svg {
    width: 22px;
    height: 22px;
}

.webcam-cancel-btn {
    padding: 12px 24px;
    border-radius: 12px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
}

.webcam-cancel-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* Light theme */
[data-theme="light"] .webcam-modal-content {
    background: #ffffff;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .webcam-header {
    background: #f8fafc;
}

[data-theme="light"] .webcam-controls {
    background: #f8fafc;
}

/* Mobile adjustments */
@media (max-width: 768px) {
    .webcam-modal-content {
        width: 95%;
        max-width: none;
        border-radius: 16px;
    }
    
    .webcam-header {
        padding: 14px 16px;
    }
    
    .webcam-header h3 {
        font-size: 15px;
    }
    
    .webcam-controls {
        padding: 16px;
        gap: 16px;
    }
    
    .webcam-capture-btn {
        width: 64px;
        height: 64px;
    }
    
    .webcam-switch-btn {
        width: 44px;
        height: 44px;
    }
    
    .webcam-cancel-btn {
        padding: 10px 20px;
        font-size: 13px;
    }
}

/* Small mobile */
@media (max-width: 480px) {
    .webcam-modal-content {
        width: 100%;
        height: 100%;
        border-radius: 0;
        max-width: none;
    }
    
    .webcam-video-container {
        aspect-ratio: auto;
        flex: 1;
    }
    
    .webcam-modal-content {
        display: flex;
        flex-direction: column;
    }
}