/*
 * Neural Core AI — Premium Design System
 * Inspired by Claude & ChatGPT aesthetics
 * Version 2.0
 */

/* ═══════════════════════════════════════
   1. CSS VARIABLES & DESIGN TOKENS
   ═══════════════════════════════════════ */

:root {
    /* Colors - Light Theme */
    --bg-primary: #F8F7F4;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F0EFEC;
    --bg-sidebar: rgba(255, 255, 255, 0.78);
    --bg-input: rgba(255, 255, 255, 0.9);
    --bg-hover: rgba(0, 0, 0, 0.04);
    --bg-active: rgba(0, 0, 0, 0.06);
    --bg-user-msg: linear-gradient(135deg, #D97757, #E8956A);
    --bg-bot-msg: #FFFFFF;

    --text-primary: #1A1A1A;
    --text-secondary: #6B6B6B;
    --text-tertiary: #9CA3AF;
    --text-on-accent: #FFFFFF;

    --accent: #D97757;
    --accent-light: #E8956A;
    --accent-gradient: linear-gradient(135deg, #D97757 0%, #E8956A 100%);
    --accent-color: var(--accent);
    --accent-glow: rgba(217, 119, 87, 0.25);
    --accent-subtle: rgba(217, 119, 87, 0.08);

    --border-color: rgba(0, 0, 0, 0.06);
    --border-strong: rgba(0, 0, 0, 0.12);

    --shadow-xs: 0 1px 2px rgba(0,0,0,0.03);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.02);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.05), 0 1px 4px rgba(0,0,0,0.03);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.07), 0 2px 8px rgba(0,0,0,0.03);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.1), 0 4px 16px rgba(0,0,0,0.04);
    --shadow-glow: 0 0 20px rgba(217, 119, 87, 0.15);
    --shadow-input: 0 2px 12px rgba(0,0,0,0.06), 0 0 0 1px rgba(0,0,0,0.04);

    --radius-xs: 6px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;

    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --transition-fast: 150ms var(--ease);
    --transition-normal: 250ms var(--ease);
    --transition-slow: 400ms var(--ease);

    --sidebar-width: 280px;
    --sidebar-collapsed: 68px;
    --header-height: 56px;
    --input-max-width: 920px;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    --font-display: 'Outfit', var(--font-sans);
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'SF Mono', monospace;

    /* Code block (Light Theme) */
    --code-bg: #FFFFFF;
    --code-header-bg: #F3F4F6;
    --code-text: #24292E;
    --code-dot-red: #ED6A5E;
    --code-dot-yellow: #F5BF4F;
    --code-dot-green: #61C554;

    --hljs-keyword: #D73A49;
    --hljs-string: #032F62;
    --hljs-number: #005CC5;
    --hljs-comment: #6A737D;
    --hljs-function: #6F42C1;
    --hljs-built_in: #005CC5;
    --hljs-type: #D73A49;
    --hljs-attr: #005CC5;
    --hljs-meta: #E36209;
    --hljs-punctuation: #24292E;

    /* Persona active color */
    --active-persona-color: var(--accent);
}

/* ═══════════════════════════════════════
   2. DARK THEME
   ═══════════════════════════════════════ */

[data-theme="dark"] {
    --bg-primary: #0D0D0D;
    --bg-secondary: #1A1A1A;
    --bg-tertiary: #252525;
    --bg-sidebar: rgba(20, 20, 20, 0.85);
    --bg-input: rgba(30, 30, 30, 0.9);
    --bg-hover: rgba(255, 255, 255, 0.06);
    --bg-active: rgba(255, 255, 255, 0.08);
    --bg-user-msg: linear-gradient(135deg, #C66B4D, #D97757);
    --bg-bot-msg: #1A1A1A;

    --text-primary: #F5F5F5;
    --text-secondary: #A1A1A1;
    --text-tertiary: #6B6B6B;
    --text-on-accent: #FFFFFF;

    --accent-glow: rgba(217, 119, 87, 0.3);
    --accent-subtle: rgba(217, 119, 87, 0.12);

    --border-color: rgba(255, 255, 255, 0.07);
    --border-strong: rgba(255, 255, 255, 0.12);

    --shadow-xs: 0 1px 2px rgba(0,0,0,0.15);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.25);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.35);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 30px rgba(217, 119, 87, 0.2);
    --shadow-input: 0 2px 12px rgba(0,0,0,0.2), 0 0 0 1px rgba(255,255,255,0.06);

    /* Code block (Catppuccin Mocha) */
    --code-bg: #1E1E2E;
    --code-header-bg: #181825;
    --code-text: #CDD6F4;
    --code-dot-red: #F38BA8;
    --code-dot-yellow: #F9E2AF;
    --code-dot-green: #A6E3A1;

    --hljs-keyword: #CBA6F7;
    --hljs-string: #A6E3A1;
    --hljs-number: #FAB387;
    --hljs-comment: #6C7086;
    --hljs-function: #89B4FA;
    --hljs-built_in: #F38BA8;
    --hljs-type: #F9E2AF;
    --hljs-attr: #89DCEB;
    --hljs-meta: #F5E0DC;
    --hljs-punctuation: #9399B2;
}

/* ═══════════════════════════════════════
   3. RESET & BASE
   ═══════════════════════════════════════ */

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ═══════════════════════════════════════
   4. KEYFRAME ANIMATIONS
   ═══════════════════════════════════════ */

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

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

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-12px); }
    to   { opacity: 1; transform: translateX(0); }
}

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

@keyframes glow-pulse {
    0%, 100% { filter: drop-shadow(0 0 10px rgba(217, 119, 87, 0.3)) drop-shadow(0 0 20px rgba(217, 119, 87, 0.15)); }
    50%      { filter: drop-shadow(0 0 15px rgba(217, 119, 87, 0.5)) drop-shadow(0 0 30px rgba(217, 119, 87, 0.25)); }
}

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

@keyframes shimmer {
    0%   { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes spin-anim {
    to { transform: rotate(360deg); }
}

@keyframes breathe {
    0%, 100% { opacity: 0.5; }
    50%      { opacity: 1; }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.92); }
    to   { opacity: 1; transform: scale(1); }
}

@keyframes gradientShift {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes dotPulse {
    0%, 80%, 100% { transform: scale(0); opacity: 0.5; }
    40% { transform: scale(1); opacity: 1; }
}

/* ═══════════════════════════════════════
   5. PAGE CONTAINER
   ═══════════════════════════════════════ */

.chat-page-container {
    display: flex;
    width: 100vw;
    height: 100vh;
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    z-index: 999999;
}

/* ═══════════════════════════════════════
   6. SIDEBAR
   ═══════════════════════════════════════ */

.chat-sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--bg-sidebar);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--border-color);
    padding: 12px;
    transition: all var(--transition-slow);
    overflow: visible;
    position: relative;
    z-index: 10;
}

.chat-sidebar.collapsed {
    width: var(--sidebar-collapsed);
    min-width: var(--sidebar-collapsed);
    padding: 12px 8px;
}

.chat-sidebar.collapsed .chat-logo-text,
.chat-sidebar.collapsed .btn-text,
.chat-sidebar.collapsed .chat-mode-tabs,
.chat-sidebar.collapsed .user-name,
.chat-sidebar.collapsed .user-plan {
    display: none;
}

.chat-sidebar.collapsed .chat-sidebar-header { align-items: center; }
.chat-sidebar.collapsed .chat-new-btn { padding: 10px; justify-content: center; }
.chat-sidebar.collapsed .chat-new-btn i { margin: 0; }
.chat-sidebar.collapsed .chat-session-item span { display: none; }
.chat-sidebar.collapsed .chat-session-item { justify-content: center; padding: 10px; }
.chat-sidebar.collapsed .session-delete-btn { display: none; }
.chat-sidebar.collapsed .chat-sidebar-user { justify-content: center; }
.chat-sidebar.collapsed .chat-home-btn { display: none; }
.chat-sidebar.collapsed .chat-sidebar-top-row { justify-content: center; }

.chat-sidebar-header {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-bottom: 12px;
}

.chat-sidebar-top-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chat-home-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: opacity var(--transition-fast);
}
.chat-home-btn:hover { opacity: 0.8; text-decoration: none; }

.chat-logo-img {
    width: 32px;
    height: 32px;
}

.chat-logo-text {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 16px;
    letter-spacing: -0.02em;
    white-space: nowrap;
}

/* Mode Tabs */
.chat-mode-tabs {
    display: flex;
    gap: 2px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding: 3px;
}

.chat-mode-tab {
    flex: 1;
    padding: 6px 0;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 500;
    font-family: var(--font-sans);
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.chat-mode-tab:hover { color: var(--text-primary); background: var(--bg-hover); }
.chat-mode-tab.active {
    background: var(--bg-secondary);
    color: var(--text-primary);
    box-shadow: var(--shadow-xs);
    font-weight: 600;
}

/* New Chat Button */
.chat-new-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border: 1px dashed var(--border-strong);
    background: transparent;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    font-family: var(--font-sans);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}
.chat-new-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-subtle);
}
.chat-new-btn i { width: 16px; height: 16px; }

/* Session List */
.chat-session-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 4px 0;
    margin-top: 4px;
}

.chat-session-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    position: relative;
    animation: fadeIn 0.3s var(--ease);
    gap: 8px;
}
.chat-session-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.chat-session-item.active {
    background: var(--bg-active);
    color: var(--text-primary);
    font-weight: 500;
}
.chat-session-item span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.session-delete-btn {
    opacity: 0;
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-xs);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    flex-shrink: 0;
}
.chat-session-item:hover .session-delete-btn { opacity: 1; }
.session-delete-btn:hover { color: #ef4444; background: rgba(239, 68, 68, 0.1); }

/* Sidebar Footer */
.chat-sidebar-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
    margin-top: 8px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.chat-sidebar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    width: 100%;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
    cursor: pointer;
    font-family: inherit;
    color: inherit;
}
.chat-sidebar-user:hover {
    background: var(--bg-hover);
}

.chat-sidebar-user-wrapper {
    position: relative;
    width: 100%;
}

.user-menu-popup {
    position: absolute;
    bottom: 100%;
    left: 0;
    width: 220px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 6px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-fast);
    z-index: 100;
}

.user-menu-popup.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: none;
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: background var(--transition-fast);
}

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

.user-menu-item i {
    width: 16px;
    height: 16px;
    color: var(--text-secondary);
}

.user-menu-theme {
    justify-content: space-between;
    cursor: default;
}

.user-menu-theme:hover {
    background: transparent;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background: var(--accent-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 13px;
    flex-shrink: 0;
}

.user-name {
    font-weight: 600;
    font-size: 13px;
    color: var(--text-primary);
    line-height: 1.2;
}

.user-plan {
    font-size: 11px;
    color: var(--text-tertiary);
    line-height: 1.2;
}

/* Theme Toggle */
.theme-toggle-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 4px;
}

.theme-toggle-label {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
}

.theme-toggle-btn {
    width: 36px;
    height: 20px;
    border-radius: var(--radius-full);
    border: none;
    background: var(--bg-tertiary);
    cursor: pointer;
    position: relative;
    transition: background var(--transition-fast);
    flex-shrink: 0;
}
.theme-toggle-btn::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    border-radius: var(--radius-full);
    background: white;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast);
}
[data-theme="dark"] .theme-toggle-btn { background: var(--accent); }
[data-theme="dark"] .theme-toggle-btn::after { transform: translateX(16px); }

/* ═══════════════════════════════════════
   7. MAIN CHAT AREA
   ═══════════════════════════════════════ */

.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    position: relative;
    background: var(--bg-primary);
}

/* Header */
.chat-main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    height: var(--header-height);
    min-height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-sidebar);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 5;
}

.chat-current-title {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chat-header-controls {
    display: flex;
    align-items: center;
    gap: 4px;
}

.chat-header-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.chat-header-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.chat-header-btn i { width: 18px; height: 18px; }

/* Model Select */
.chat-model-select-wrap { display: flex; align-items: center; }

.chat-model-select {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font-sans);
    padding: 4px 22px 4px 8px;
    border-radius: 6px;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888888' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 4px center;
    transition: all var(--transition-fast);
    outline: none;
}
.chat-model-select:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}
.chat-model-select:hover { border-color: var(--border-strong); }
.chat-model-select:focus { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-subtle); }

/* ═══════════════════════════════════════
   8. CHAT LOG
   ═══════════════════════════════════════ */

.chat-log-full {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    padding: 24px 0;
    scroll-behavior: smooth;
}

/* ═══════════════════════════════════════
   9. WELCOME SCREEN
   ═══════════════════════════════════════ */

.chat-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    padding: 50px 24px;
    text-align: center;
    animation: fadeIn 0.4s var(--ease);
}

.chat-welcome-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    position: relative;
}

.chat-welcome-logo svg {
    filter: drop-shadow(0 4px 12px rgba(217, 119, 87, 0.15));
}

.chat-welcome h2 {
    font-family: var(--font-sans);
    font-size: 26px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.chat-welcome p {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 400;
    margin-bottom: 32px;
    max-width: 440px;
    line-height: 1.5;
}

.chat-welcome-suggestions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 10px;
    max-width: 720px;
    width: 100%;
}

.chat-suggestion-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    text-align: left;
    line-height: 1.4;
}
.chat-suggestion-item:hover {
    border-color: var(--border-strong);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-xs);
}
.chat-suggestion-item i {
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
    flex-shrink: 0;
    transition: color var(--transition-fast);
}
.chat-suggestion-item:hover i {
    color: var(--accent);
}

/* ═══════════════════════════════════════
   10. CHAT MESSAGES
   ═══════════════════════════════════════ */

.ai-msg {
    padding: 4px 24px;
    animation: fadeInUp 0.35s var(--ease) both;
    max-width: var(--input-max-width);
    width: 100%;
    margin: 0 auto;
    line-height: 1.7;
    font-size: 15px;
}

.ai-msg.user {
    display: flex;
    justify-content: flex-end;
    padding-top: 16px;
    padding-bottom: 8px;
}

.ai-msg.user > div,
.ai-msg.user > span,
.ai-msg.user > p {
    background: var(--bg-user-msg);
    color: var(--text-on-accent);
    padding: 10px 16px;
    border-radius: var(--radius-lg) var(--radius-lg) var(--radius-xs) var(--radius-lg);
    max-width: 70%;
    word-wrap: break-word;
    font-size: 14px;
    line-height: 1.6;
    box-shadow: var(--shadow-sm);
}

.ai-msg.user img {
    border-radius: var(--radius-md);
    margin-top: 8px;
    max-width: 200px;
}

.ai-msg.bot {
    display: flex;
    gap: 10px;
    padding-top: 12px;
    padding-bottom: 16px;
}

.bot-avatar {
    width: 24px;
    height: 24px;
    min-width: 24px;
    border-radius: var(--radius-xs);
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 3px;
    overflow: hidden;
}
.bot-avatar img, .bot-avatar svg {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-xs);
    opacity: 1;
}

.bot-content {
    flex: 1;
    min-width: 0;
    color: var(--text-primary);
}

/* HTML Widget - direct child of chat-log, no parent constraint */
.generated-html-widget {
    width: calc(100% - 48px);
    max-width: 1200px;
    margin: 8px auto 16px auto;
    height: 320px;
    border: 1px solid var(--border-light);
    border-radius: 12px;
    overflow: hidden;
    background: var(--bg-secondary);
    box-shadow: 0 4px 24px rgba(0,0,0,0.08);
    transition: box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    resize: vertical;
    animation: fadeInUp 0.35s var(--ease) both;
}
.generated-html-widget:hover {
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
}
.generated-html-widget iframe {
    flex: 1;
    width: 100%;
    border: none;
}

/* Live preview header bar */
.live-preview-header {
    background: linear-gradient(135deg, #1e293b, #334155);
    padding: 6px 14px;
    font-size: 12px;
    color: #94a3b8;
    font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    flex-shrink: 0;
}
.live-preview-header .dot {
    width: 8px; height: 8px; border-radius: 50%;
}
.live-preview-header .dot-red { background: #ef4444; }
.live-preview-header .dot-yellow { background: #eab308; }
.live-preview-header .dot-green { background: #22c55e; }
.live-preview-header .status-text {
    color: #60a5fa;
    font-weight: 600;
    margin-left: auto;
    animation: livePulse 1.5s ease-in-out infinite;
}

@keyframes livePulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Upload preview container - hidden by default, shown by JS */
#chat-image-preview-container {
    display: none;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    padding: 10px 14px;
    background: var(--bg-primary);
}

/* AI Cursor */
.ai-cursor {
    display: inline-block;
    width: 2px;
    height: 1.1em;
    background: var(--accent);
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: blink 0.8s infinite;
    border-radius: 1px;
}

/* ═══════════════════════════════════════
   11. THINKING BLOCK
   ═══════════════════════════════════════ */

.ai-thinking-block {
    margin: 0 0 12px 0;
    width: fit-content;
    border: none;
    border-left: 2px solid var(--border-strong);
    border-radius: var(--radius-xs);
    overflow: hidden;
    font-size: 13px;
    background: transparent;
    animation: fadeIn 0.3s var(--ease);
    padding: 0 0 0 0;
}

.ai-thinking-block summary {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    cursor: pointer;
    color: var(--text-tertiary);
    font-size: 12px;
    font-weight: 500;
    user-select: none;
    transition: color var(--transition-fast);
    list-style: none;
    border-radius: var(--radius-xs);
}
.ai-thinking-block summary::-webkit-details-marker { display: none; }
.ai-thinking-block summary:hover { color: var(--text-secondary); }

.think-spinner {
    width: 12px;
    height: 12px;
    border: 1.5px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin-anim 0.8s linear infinite;
    flex-shrink: 0;
}

.think-label { flex: 1; }

.think-arrow {
    transition: transform var(--transition-fast);
    font-size: 10px;
    color: var(--text-tertiary);
}

details[open] .think-arrow { transform: rotate(180deg); }

.think-content {
    padding: 4px 10px 8px;
    color: var(--text-tertiary);
    font-size: 11px;
    line-height: 1.6;
    border-top: none;
    max-height: 200px;
    overflow-y: auto;
}

.think-line {
    padding: 3px 0;
    display: flex;
    align-items: center;
    gap: 6px;
    animation: fadeIn 0.3s var(--ease);
}
.think-icon-bullet {
    width: 14px;
    height: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.think-icon-bullet svg {
    width: 14px;
    height: 14px;
}
.think-text-span {
    flex: 1;
    word-break: break-all;
    font-size: 11.5px;
}

/* Dynamic URL Action Card & Suggestion Action Chips */
.url-action-card {
    margin: 14px 0;
    padding: 16px 20px;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.1), rgba(99, 102, 241, 0.1));
    border: 1px solid rgba(56, 189, 248, 0.3);
    border-radius: 12px;
    font-family: var(--font-sans);
}
.open-url-btn {
    padding: 8px 16px;
    background: var(--accent, #0284c7);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-size: 12.5px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(2, 132, 199, 0.25);
}
.open-url-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(2, 132, 199, 0.4);
    filter: brightness(1.1);
}
.url-suggest-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}
.url-suggest-chip {
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    font-size: 11.5px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}
.url-suggest-chip:hover {
    background: rgba(56, 189, 248, 0.2);
    border-color: rgba(56, 189, 248, 0.5);
    color: #38bdf8;
    transform: translateY(-1px);
}

/* ═══════════════════════════════════════
   12. CODE BLOCKS
   ═══════════════════════════════════════ */

pre {
    margin: 16px 0;
    border-radius: var(--radius-md);
    overflow: visible;
    background: var(--code-bg);
    position: relative;
}

code {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.65;
}

/* Inline code */
:not(pre) > code:not(.hljs) {
    background: var(--bg-tertiary);
    color: var(--accent);
    padding: 2px 7px;
    border-radius: var(--radius-xs);
    font-size: 0.88em;
    border: 1px solid var(--border-color);
}

/* Code block header - macOS terminal style */
.code-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--code-header-bg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    position: sticky;
    top: -24px;
    z-index: 2;
}

.code-block-header::before {
    content: '';
    display: flex;
    gap: 6px;
    width: 52px;
    height: 12px;
    background: radial-gradient(circle at 6px 6px, var(--code-dot-red) 4px, transparent 4px),
                radial-gradient(circle at 24px 6px, var(--code-dot-yellow) 4px, transparent 4px),
                radial-gradient(circle at 42px 6px, var(--code-dot-green) 4px, transparent 4px);
    flex-shrink: 0;
}

.code-block-header span {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.code-actions {
    display: flex;
    gap: 2px;
}

.code-icon-btn,
.code-download-btn,
.code-copy-btn,
.code-fold-btn {
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 4px 6px;
    border-radius: var(--radius-xs);
    font-size: 12px;
    font-family: var(--font-mono);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 4px;
}
.code-icon-btn:hover,
.code-download-btn:hover,
.code-copy-btn:hover,
.code-fold-btn:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}
.code-copy-btn.copied { color: var(--code-dot-green); }

.code-content-wrapper {
    overflow-x: auto;
    padding: 16px;
}

/* Custom scrollbar for code blocks */
.code-content-wrapper::-webkit-scrollbar {
    height: 8px;
}
.code-content-wrapper::-webkit-scrollbar-track {
    background: transparent;
    border-radius: var(--radius-full);
}
.code-content-wrapper::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: var(--radius-full);
    border: 2px solid var(--code-bg);
}
.code-content-wrapper::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

.code-content-wrapper pre {
    margin: 0;
    border-radius: 0;
}

.code-content-wrapper code {
    white-space: pre !important;
    word-wrap: normal !important;
    word-break: normal !important;
}

/* Syntax Highlighting theme (Adaptive Light/Dark) */
pre code.hljs { display: block; padding: 0; background: transparent; color: var(--code-text); }
.hljs-keyword  { color: var(--hljs-keyword); }
.hljs-string   { color: var(--hljs-string); }
.hljs-number   { color: var(--hljs-number); }
.hljs-comment  { color: var(--hljs-comment); font-style: italic; }
.hljs-function,
.hljs-title    { color: var(--hljs-function); }
.hljs-built_in { color: var(--hljs-built_in); }
.hljs-type     { color: var(--hljs-type); }
.hljs-variable { color: var(--code-text); }
.hljs-attr     { color: var(--hljs-attr); }
.hljs-params   { color: var(--hljs-attr); }
.hljs-meta     { color: var(--hljs-meta); }
.hljs-literal  { color: var(--hljs-number); }
.hljs-operator { color: var(--hljs-attr); }
.hljs-punctuation { color: var(--hljs-punctuation); }
.hljs-property { color: var(--hljs-attr); }
.hljs-regexp   { color: var(--hljs-built_in); }
.hljs-selector-class { color: var(--hljs-string); }
.hljs-selector-id    { color: var(--hljs-type); }
.hljs-selector-tag   { color: var(--hljs-keyword); }

/* Sticky code header in messages */
.ai-msg pre { overflow: visible; }
.ai-msg .code-block-header {
    position: sticky;
    top: -32px;
    z-index: 2;
}

/* ═══════════════════════════════════════
   13. INPUT AREA
   ═══════════════════════════════════════ */

.chat-input-wrapper-full {
    padding: 0 24px 20px;
    max-width: calc(var(--input-max-width) + 48px);
    margin: 0 auto;
    width: 100%;
}

.chat-input-box {
    background: var(--bg-input);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 10px 14px !important;
    box-shadow: var(--shadow-input);
    transition: all var(--transition-normal);
    --active-persona-color: var(--accent);
}

.chat-input-box:focus-within {
    border-color: var(--accent);
    box-shadow: var(--shadow-input), 0 0 0 3px var(--accent-subtle);
}

#chat-input {
    width: 100%;
    border: none;
    outline: none;
    resize: none;
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background: transparent;
    max-height: 200px;
    padding: 2px 0;
}
#chat-input::placeholder { color: var(--text-tertiary); }

/* Action Buttons */
.chat-input-actions {
    display: flex;
    gap: 2px;
    align-items: center;
}

.chat-input-action-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}
.chat-input-action-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.chat-input-action-btn.active {
    color: var(--accent);
    background: var(--accent-subtle);
}
.chat-input-action-btn i { width: 16px; height: 16px; }

/* Send Button */
.chat-send-btn {
    width: 36px;
    height: 36px;
    min-width: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: var(--accent-gradient);
    color: white;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    align-self: flex-end;
    box-shadow: var(--shadow-sm);
}
.chat-send-btn:hover {
    transform: scale(1.08);
    box-shadow: var(--shadow-glow);
}
.chat-send-btn:active { transform: scale(0.95); }
.chat-send-btn i { width: 16px; height: 16px; }

/* Input Footer */
.chat-input-footer {
    text-align: center;
    font-size: 11px;
    color: var(--text-tertiary);
    padding: 8px 0 0;
    letter-spacing: 0.01em;
}

/* Format Dropdown */
#chat-format-dropdown {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 4px;
    animation: scaleIn 0.15s var(--ease);
}

.format-option {
    width: 32px;
    height: 32px;
}

/* ═══════════════════════════════════════
   14. PERSONAS & PRESETS
   ═══════════════════════════════════════ */

.personas-presets {
    display: flex;
    gap: 4px;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none; /* Firefox */
}
.personas-presets::-webkit-scrollbar {
    display: none; /* Chrome, Safari and Opera */
}

.preset-btn-icon,
.preset-btn-text {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 5px 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 500;
    font-family: var(--font-sans);
    border-radius: var(--radius-full);
    cursor: pointer;
    white-space: nowrap;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}
.preset-btn-icon:hover,
.preset-btn-text:hover {
    border-color: var(--border-strong);
    background: var(--bg-hover);
    color: var(--text-primary);
}
.preset-btn-icon i,
.preset-btn-text i { width: 13px; height: 13px; }

.preset-btn-icon.active-preset,
.preset-btn-text.active-preset {
    border-color: var(--active-persona-color);
    background: color-mix(in srgb, var(--active-persona-color) 8%, transparent);
    color: var(--active-persona-color);
}

.personas-row-show {
    max-height: 60px !important;
    opacity: 1 !important;
    padding-top: 4px !important;
    padding-bottom: 4px !important;
}

/* Skills Dropdown */
#more-skills-dropdown {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 4px;
    max-height: 280px;
    overflow-y: auto;
    animation: scaleIn 0.15s var(--ease);
}

.skill-dropdown-item {
    padding: 8px 14px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 8px;
}
.skill-dropdown-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.skill-dropdown-item.loading { opacity: 0.5; pointer-events: none; }

.spin-icon {
    display: inline-block;
    animation: spin-anim 0.8s linear infinite;
}

/* ═══════════════════════════════════════
   15. SETTINGS MODAL
   ═══════════════════════════════════════ */

.ai-settings-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.2s var(--ease);
}

.ai-settings-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    width: 480px;
    max-width: 92vw;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: scaleIn 0.25s var(--ease-spring);
}

.ai-settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px 16px;
    border-bottom: 1px solid var(--border-color);
}

.ai-settings-header h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 600;
    font-family: var(--font-display);
    color: var(--text-primary);
}
.ai-settings-header h3 i { width: 18px; height: 18px; color: var(--accent); }

.ai-settings-body {
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.setting-group textarea,
.setting-group select {
    font-family: var(--font-sans);
    font-size: 13px;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition-fast);
    resize: vertical;
}
.setting-group textarea:focus,
.setting-group select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-subtle);
}

.setting-group input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    outline: none;
}
.setting-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    background: var(--accent);
    cursor: pointer;
    box-shadow: var(--shadow-sm), 0 0 0 3px var(--accent-subtle);
    transition: transform var(--transition-fast);
}
.setting-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.setting-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
}

.ai-settings-footer {
    padding: 16px 24px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
}

.ai-settings-footer .chat-new-btn {
    border: none;
    background: var(--accent-gradient);
    color: white;
    font-weight: 600;
    padding: 10px 24px;
    box-shadow: var(--shadow-sm);
}
.ai-settings-footer .chat-new-btn:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

/* Preset buttons in settings modal */
.ai-settings-body .preset-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 500;
    font-family: var(--font-sans);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.ai-settings-body .preset-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}
.ai-settings-body .preset-btn.active {
    border-color: var(--accent);
    background: var(--accent-subtle);
    color: var(--accent);
}

/* ═══════════════════════════════════════
   16. MESSAGE CONTENT TYPOGRAPHY
   ═══════════════════════════════════════ */

.ai-msg.bot strong,
.bot-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.ai-msg.bot h1,
.bot-content h1 {
    font-size: 1.6em;
    font-weight: 700;
    margin: 24px 0 12px;
    color: var(--text-primary);
    font-family: var(--font-display);
    letter-spacing: -0.02em;
}

.ai-msg.bot h2,
.bot-content h2 {
    font-size: 1.35em;
    font-weight: 700;
    margin: 20px 0 10px;
    color: var(--text-primary);
    font-family: var(--font-display);
    letter-spacing: -0.01em;
}

.ai-msg.bot h3,
.bot-content h3 {
    font-size: 1.15em;
    font-weight: 600;
    margin: 16px 0 8px;
    color: var(--text-primary);
}

.ai-msg.bot h4,
.bot-content h4 {
    font-size: 1em;
    font-weight: 600;
    margin: 14px 0 6px;
    color: var(--text-primary);
}

.ai-msg.bot ul,
.ai-msg.bot ol,
.bot-content ul,
.bot-content ol {
    margin: 10px 0;
    padding-left: 24px;
}

.ai-msg.bot li,
.bot-content li {
    margin: 4px 0;
    line-height: 1.7;
}

.ai-msg.bot blockquote,
.bot-content blockquote {
    border-left: 3px solid var(--accent);
    padding: 8px 16px;
    margin: 12px 0;
    color: var(--text-secondary);
    background: var(--accent-subtle);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic;
}

.ai-msg.bot a,
.bot-content a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 2px;
    transition: opacity var(--transition-fast);
}
.ai-msg.bot a:hover,
.bot-content a:hover { opacity: 0.8; }

/* Tables */
.ai-msg.bot table,
.bot-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 13px;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.ai-msg.bot th,
.bot-content th {
    background: var(--bg-tertiary);
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-strong);
}

.ai-msg.bot td,
.bot-content td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.ai-msg.bot tr:hover td,
.bot-content tr:hover td {
    background: var(--bg-hover);
}

/* ═══════════════════════════════════════
   17. IMAGE PREVIEW
   ═══════════════════════════════════════ */

#chat-image-preview-container {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    padding: 8px 12px !important;
}

/* ═══════════════════════════════════════
   18. RESPONSIVE DESIGN
   ═══════════════════════════════════════ */

@media (max-width: 768px) {
    .chat-sidebar {
        position: absolute;
        left: 0;
        top: 0;
        z-index: 100;
        transform: translateX(-100%);
        box-shadow: var(--shadow-xl);
        width: 280px;
    }
    .chat-sidebar:not(.collapsed) {
        transform: translateX(0);
    }
    .chat-sidebar.collapsed {
        transform: translateX(-100%);
        width: 280px;
    }

    .chat-main-header { padding: 0 12px; }
    .chat-input-wrapper-full { padding: 0 12px 12px; }
    .ai-msg { padding-left: 12px; padding-right: 12px; }

    .chat-welcome h2 { font-size: 22px; }
    .chat-welcome p { font-size: 14px; }
    .chat-welcome-suggestions { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .ai-msg.user > div,
    .ai-msg.user > span,
    .ai-msg.user > p {
        max-width: 88%;
    }
    .chat-suggestion-item { font-size: 12px; padding: 12px 14px; }
}

/* ═══════════════════════════════════════
   DARK MODE OVERRIDES
   ═══════════════════════════════════════ */

[data-theme="dark"] {
    --bg-primary: #121212;
    --bg-secondary: #1E1E1E;
    --bg-tertiary: #2A2A2A;
    --bg-sidebar: rgba(25, 25, 25, 0.85);
    --bg-input: rgba(40, 40, 40, 0.95);
    --bg-hover: rgba(255, 255, 255, 0.06);
    --bg-active: rgba(255, 255, 255, 0.1);
    --bg-user-msg: linear-gradient(135deg, #E06C47, #F28C5B);
    --bg-bot-msg: #242424;

    --text-primary: #EDEDED;
    --text-secondary: #A0A0A0;
    --text-tertiary: #6B6B6B;
    --text-on-accent: #FFFFFF;

    --accent: #E06C47;
    --accent-light: #F28C5B;
    --accent-gradient: linear-gradient(135deg, #E06C47 0%, #F28C5B 100%);
    --accent-glow: rgba(224, 108, 71, 0.25);
    --accent-subtle: rgba(224, 108, 71, 0.15);

    --border-color: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.18);

    --shadow-xs: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.5), 0 1px 4px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.6), 0 2px 8px rgba(0,0,0,0.3);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.7), 0 4px 16px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 20px rgba(224, 108, 71, 0.2);
    --shadow-input: 0 2px 12px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,255,255,0.08);
}

/* —————— CANVAS RESIZER SPLITTER —————— */
.canvas-resizer {
    display: none;
    width: 6px;
    height: 100vh;
    background: var(--border-color);
    cursor: col-resize;
    position: relative;
    z-index: 99;
    flex-shrink: 0;
    transition: background 0.2s ease, box-shadow 0.2s ease;
    user-select: none;
    touch-action: none;
}

.canvas-resizer::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 4px;
    height: 36px;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.35);
    transition: background 0.2s ease, height 0.2s ease;
}

.canvas-resizer:hover,
.canvas-resizer.dragging {
    background: var(--accent, #fb8c00);
    box-shadow: 0 0 12px var(--accent-subtle, rgba(251, 140, 0, 0.4));
}

.canvas-resizer:hover::after,
.canvas-resizer.dragging::after {
    background: #ffffff;
    height: 48px;
}

/* —————— CANVAS PANE —————— */
.canvas-pane {
    display: none;
    flex: 1;
    flex-direction: column;
    background: var(--bg-primary);
    border-left: 1px solid var(--border-color);
    position: relative;
    z-index: 10;
    overflow: hidden;
}

[data-theme="dark"] .canvas-pane {
    background: rgba(30, 30, 32, 0.5);
}

.canvas-pane.open {
    display: flex;
    animation: slideInRight 0.3s ease-out forwards;
}

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

.canvas-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    height: var(--header-height);
    min-height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-sidebar);
}

.canvas-title-area {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.canvas-tabs {
    display: flex;
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 4px;
    gap: 4px;
}

.canvas-tab {
    background: transparent;
    border: none;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.canvas-tab:hover {
    color: var(--text-primary);
}

.canvas-tab.active {
    background: var(--bg-primary);
    color: var(--text-primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

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

.canvas-divider {
    width: 1px;
    height: 16px;
    background: var(--border-color);
    margin: 0 4px;
}

.canvas-body {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.canvas-content {
    position: absolute;
    inset: 0;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    display: flex;
    flex-direction: column;
}

.canvas-content.active {
    opacity: 1;
    pointer-events: auto;
}

#canvas-code-view pre {
    flex: 1;
    margin: 0;
    padding: 16px;
    overflow: auto;
    background: transparent !important;
}

#canvas-code-view code {
    font-family: 'Fira Code', Consolas, monospace;
    font-size: 14px;
}

#canvas-iframe {
    flex: 1;
    width: 100%;
    height: 100%;
    border: none;
    background: #fff;
}

/* Canvas Editable Overlay */
#canvas-code-view {
    overflow: auto;
    background: var(--bg-primary);
}
#canvas-code-view > div {
    position: relative;
    min-height: 100%;
}
#canvas-code-textarea, #canvas-code-view pre {
    margin: 0;
    padding: 16px;
    border: 0;
    font-family: 'Fira Code', Consolas, monospace;
    font-size: 14px;
    line-height: 1.5;
    tab-size: 4;
}
#canvas-code-textarea {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    color: transparent;
    caret-color: var(--text-primary);
    z-index: 2;
    resize: none;
    outline: none;
    white-space: pre;
    overflow: hidden;
}
#canvas-code-view pre {
    margin: 0;
    z-index: 1;
    pointer-events: none;
    background: transparent !important;
}

#canvas-code-view pre code {
    font-family: 'Fira Code', Consolas, monospace !important;
    font-size: 14px !important;
    line-height: 1.5 !important;
    padding: 0 !important;
    margin: 0 !important;
    border: 0 !important;
    white-space: pre !important;
    tab-size: 4 !important;
}
#canvas-code-textarea {
    white-space: pre !important;
    word-wrap: normal !important;
    overflow-wrap: normal !important;
}
#canvas-code-textarea::selection {
    background: rgba(100, 150, 255, 0.4);
}

/* AI Timer Styles */
.ai-timer-container {
    background: var(--bg-alt);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    margin: 10px 0;
    width: 280px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    font-family: 'Inter', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow: hidden;
}
.ai-timer-header {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 500;
}
.ai-timer-time {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
    letter-spacing: -1px;
}
.ai-timer-progress-bg {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    margin-top: 12px;
    overflow: hidden;
}
.ai-timer-progress-fill {
    height: 100%;
    background: #ef4444;
    width: 100%;
    transition: width 1s linear, background-color 0.3s;
}
.ai-timer-container.finished .ai-timer-progress-fill {
    background: #10b981;
}
.ai-timer-container.finished .ai-timer-time {
    color: #10b981;
}
.ai-timer-container.finished {
    border-color: #10b981;
}

/* Cyberpunk Hacker Theme */
[data-theme="hacker"] {
  --bg-color: #050505;
  --bg-alt: #0a0a0a;
  --text-primary: #00ff00;
  --text-secondary: #00aa00;
  --border-color: #003300;
  --accent-color: #00ff00;
  --accent-hover: #00cc00;
}
[data-theme="hacker"] * {
  font-family: 'Courier New', Courier, monospace !important;
}

/* Warm / Reading Theme */
[data-theme="warm"] {
  --bg-color: #fdf6e3;
  --bg-alt: #eee8d5;
  --text-primary: #657b83;
  --text-secondary: #586e75;
  --border-color: #d33682;
  --accent-color: #b58900;
  --accent-hover: #cb4b16;
}

/* Classified Message Styles */
.classified-message-container {
    border: 2px dashed #ef4444;
    background: rgba(239, 68, 68, 0.05);
    border-radius: 8px;
    padding: 12px;
    margin: 10px 0;
    position: relative;
    overflow: hidden;
    transition: all 0.5s ease;
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.1);
}
.classified-warning {
    color: #ef4444;
    font-weight: bold;
    font-size: 12px;
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
}
.classified-content-blur {
    filter: blur(6px);
    transition: filter 0.3s;
    user-select: none;
    color: var(--text-primary);
    padding: 10px;
    background: var(--bg-color);
    border-radius: 4px;
}
.classified-message-container[data-destroyed="false"]:hover .classified-content-blur {
    filter: blur(0px);
    user-select: text;
}
.classified-message-container.burning {
    animation: burnEffect 1.8s forwards;
}
@keyframes burnEffect {
    0% { filter: brightness(1) sepia(0); opacity: 1; transform: scale(1) rotate(0deg); }
    40% { filter: brightness(1.5) sepia(1) hue-rotate(-50deg); opacity: 0.8; transform: scale(1.02) rotate(1deg); }
    80% { filter: brightness(2) sepia(1) hue-rotate(-50deg) blur(2px); opacity: 0.3; transform: scale(0.95) rotate(-1deg); }
    100% { filter: brightness(0) blur(4px); opacity: 0; transform: scale(0.9) rotate(0deg); }
}

/* Breathing Orb */
.orb-container {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: 30px; background: var(--bg-alt); border-radius: 16px; margin: 10px 0; border: 1px solid var(--border-color);
}
.breathing-orb {
    width: 100px; height: 100px; border-radius: 50%;
    background: radial-gradient(circle, #60a5fa 0%, #3b82f6 100%);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.5);
    display: flex; align-items: center; justify-content: center;
    color: white; font-weight: bold; font-size: 16px; text-align: center;
    transition: transform 4s linear, background 2s linear, box-shadow 2s linear;
}

/* Ambient Mixer */
.mixer-container {
    background: var(--bg-alt); padding: 15px; border-radius: 12px; margin: 10px 0; border: 1px solid var(--border-color);
}
.mixer-title { font-weight: bold; margin-bottom: 12px; font-size: 14px; display: flex; align-items: center; gap: 8px; }
.mixer-track { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.mixer-track span { width: 40px; font-size: 20px; text-align: center; }
.mixer-track input[type=range] { flex: 1; accent-color: var(--accent-color); cursor: pointer; }

/* Focus Tree Timer */
.tree-container {
    background: var(--bg-alt); border: 2px solid var(--border-color); border-radius: 16px; padding: 20px;
    text-align: center; margin: 10px 0; box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}
.tree-emoji { font-size: 64px; margin: 10px 0; transition: transform 0.3s; }
.tree-time { font-size: 24px; font-weight: bold; font-variant-numeric: tabular-nums; margin-bottom: 8px; }
.tree-btn {
    background: #ef4444; color: white; border: none; padding: 6px 14px; border-radius: 8px; cursor: pointer; font-weight: bold; transition: background 0.2s;
}
.tree-btn:hover { background: #dc2626; }
.tree-btn.success { background: #10b981; pointer-events: none; }

/* Decision Coin */
.coin-container { perspective: 1000px; display: flex; flex-direction: column; align-items: center; margin: 20px 0; cursor: pointer; }
.coin {
    width: 100px; height: 100px; position: relative; transform-style: preserve-3d;
    transition: transform 3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.coin-face {
    position: absolute; width: 100%; height: 100%; border-radius: 50%;
    backface-visibility: hidden; display: flex; align-items: center; justify-content: center;
    font-size: 24px; font-weight: bold; border: 4px solid #d4af37;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.2), 0 4px 10px rgba(0,0,0,0.3);
}
.coin-front { background: linear-gradient(45deg, #fef08a, #eab308); color: #854d0e; }
.coin-back { background: linear-gradient(45deg, #e2e8f0, #94a3b8); color: #334155; transform: rotateY(180deg); }
.coin-result { margin-top: 15px; font-weight: bold; font-size: 16px; min-height: 24px; opacity: 0; transition: opacity 0.5s; }

/* Math Plotter */
.math-plot-container { background: #fff; border-radius: 12px; padding: 10px; margin: 10px 0; border: 1px solid var(--border-color); }
.math-plot-title { font-weight: bold; margin-bottom: 10px; font-family: monospace; color: var(--accent-color); }

/* Regex Visualizer */
.regex-container { background: var(--bg-alt); padding: 15px; border-radius: 12px; margin: 10px 0; border: 1px solid var(--border-color); font-family: monospace; }
.regex-inputs { display: flex; gap: 10px; margin-bottom: 10px; }
.regex-input-box { flex: 1; padding: 8px; border-radius: 6px; border: 1px solid var(--border-light); background: var(--bg-color); color: var(--text-primary); }
.regex-flag-box { width: 60px; padding: 8px; border-radius: 6px; border: 1px solid var(--border-light); background: var(--bg-color); color: var(--text-primary); }
.regex-test-area { width: 100%; min-height: 80px; padding: 8px; border-radius: 6px; border: 1px solid var(--border-light); background: var(--bg-color); color: var(--text-primary); resize: vertical; margin-bottom: 10px; }
.regex-output { padding: 10px; background: #fff; border-radius: 6px; border: 1px dashed var(--border-color); min-height: 40px; white-space: pre-wrap; word-break: break-all; color: #333; }
.regex-output mark { background: #fef08a; color: #854d0e; padding: 2px 0; border-radius: 2px; font-weight: bold; }
.regex-output mark:nth-child(even) { background: #bbf7d0; color: #166534; }

/* SQL Table */
.sql-container { background: #fff; padding: 15px; border-radius: 12px; margin: 10px 0; border: 1px solid var(--border-color); overflow-x: auto; }
.sql-query-display { font-family: monospace; background: #f1f5f9; padding: 8px; border-radius: 6px; margin-bottom: 10px; color: #334155; font-size: 13px; }
.sql-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.sql-table th { background: #e2e8f0; color: #334155; font-weight: bold; padding: 8px; text-align: left; border: 1px solid #cbd5e1; }
.sql-table td { padding: 8px; border: 1px solid #cbd5e1; color: #475569; }
.sql-table tr:nth-child(even) { background: #f8fafc; }

/* Music Sequencer */
.music-container { background: var(--bg-alt); padding: 15px; border-radius: 12px; margin: 10px 0; border: 1px solid var(--border-color); text-align: center; }
.music-btn { background: var(--accent-color); color: white; border: none; padding: 10px 20px; border-radius: 8px; font-weight: bold; cursor: pointer; font-size: 16px; transition: background 0.2s; display: inline-flex; align-items: center; gap: 8px; }
.music-btn:hover { background: var(--accent-hover); }
.music-status { font-family: monospace; font-size: 14px; margin-top: 10px; color: var(--text-secondary); min-height: 20px; }

/* Interactive Map */
.map-container-wrapper { border: 1px solid var(--border-color); border-radius: 12px; overflow: hidden; margin: 10px 0; background: #eee; }

/* Logic Simulator */
.logic-container { background: #f8fafc; padding: 20px; border-radius: 12px; margin: 10px 0; border: 2px solid #e2e8f0; font-family: monospace; }
.logic-title { font-weight: bold; margin-bottom: 15px; color: #334155; font-size: 16px; border-bottom: 1px solid #cbd5e1; padding-bottom: 10px; }
.logic-switches { display: flex; flex-wrap: wrap; gap: 15px; margin-bottom: 20px; }
.logic-switch-wrapper { display: flex; align-items: center; gap: 8px; background: #fff; padding: 8px 12px; border-radius: 8px; border: 1px solid #cbd5e1; }
.logic-switch-label { font-weight: bold; color: #475569; font-size: 16px; }

/* CSS Toggle Switch */
.switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #ccc; transition: .4s; border-radius: 24px; }
.slider:before { position: absolute; content: ""; height: 16px; width: 16px; left: 4px; bottom: 4px; background-color: white; transition: .4s; border-radius: 50%; }
input:checked + .slider { background-color: #3b82f6; }
input:checked + .slider:before { transform: translateX(20px); }

.logic-result-box { display: flex; align-items: center; justify-content: center; gap: 15px; padding: 15px; background: #1e293b; border-radius: 8px; color: white; font-size: 20px; }
.logic-bulb { font-size: 40px; transition: text-shadow 0.2s, color 0.2s; color: #475569; }
.logic-bulb.on { color: #facc15; text-shadow: 0 0 20px #facc15; }

/* P2P Portal */
.p2p-container { background: #0f172a; padding: 20px; border-radius: 12px; margin: 10px 0; border: 2px solid #3b82f6; text-align: center; color: white; display: flex; flex-direction: column; align-items: center; box-shadow: 0 0 20px rgba(59, 130, 246, 0.2); }
.p2p-title { font-weight: bold; font-size: 18px; margin-bottom: 15px; color: #60a5fa; letter-spacing: 1px; }
.p2p-qr { background: white; padding: 15px; border-radius: 8px; margin-bottom: 15px; width: 200px; height: 200px; display: flex; justify-content: center; align-items: center; color: black; font-weight: bold; }
.p2p-status { font-family: monospace; font-size: 14px; color: #94a3b8; background: #1e293b; padding: 8px 15px; border-radius: 20px; }

/* AI Sandbox */
.ai-sandbox-container { background: #0f172a; padding: 20px; border-radius: 12px; margin: 10px 0; border: 2px solid #8b5cf6; color: white; display: flex; flex-direction: column; gap: 10px; box-shadow: 0 0 20px rgba(139, 92, 246, 0.2); }
.ai-sandbox-header { font-weight: bold; font-size: 16px; color: #a78bfa; margin-bottom: 5px; }
.ai-progress-wrapper { background: #1e293b; border-radius: 6px; padding: 2px; position: relative; height: 24px; overflow: hidden; }
.ai-progress-bar { background: linear-gradient(90deg, #8b5cf6, #3b82f6); width: 0%; height: 100%; border-radius: 4px; transition: width 0.2s; }
.ai-progress-text { position: absolute; top: 0; left: 0; width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; font-size: 12px; font-family: monospace; text-shadow: 1px 1px 2px black; font-weight: bold; }
.ai-sandbox-input { background: #1e293b; border: 1px solid #475569; color: white; padding: 10px; border-radius: 8px; font-family: monospace; resize: vertical; min-height: 60px; outline: none; }
.ai-sandbox-input:focus { border-color: #8b5cf6; }
.ai-sandbox-btn { background: #8b5cf6; color: white; border: none; padding: 10px; border-radius: 8px; font-weight: bold; cursor: pointer; transition: 0.2s; }
.ai-sandbox-btn:hover { background: #7c3aed; }
.ai-sandbox-btn:disabled { background: #475569; cursor: not-allowed; }
.ai-sandbox-output { background: #020617; padding: 10px; border-radius: 8px; font-family: monospace; min-height: 40px; display: flex; align-items: center; justify-content: center; border: 1px dashed #475569; }

/* WebLLM Sub-Agent */
.subagent-container { background: rgba(16, 185, 129, 0.05); padding: 20px; border-radius: 16px; margin: 15px 0; border: 1px solid rgba(16, 185, 129, 0.2); color: var(--text-color, #333); display: flex; flex-direction: column; gap: 12px; box-shadow: 0 4px 24px rgba(16, 185, 129, 0.05); backdrop-filter: blur(10px); }
.subagent-header { font-weight: 600; font-size: 16px; color: #059669; margin-bottom: 5px; display: flex; align-items: center; gap: 8px;}
.subagent-task { background: rgba(16, 185, 129, 0.1); padding: 12px 16px; border-radius: 10px; font-size: 14px; border-left: 4px solid #10b981; margin-bottom: 5px; color: var(--text-color, #444); font-weight: 500;}
.subagent-progress-wrapper { background: rgba(0,0,0,0.05); border-radius: 8px; padding: 0; position: relative; height: 16px; overflow: hidden; }
.subagent-progress-bar { background: linear-gradient(90deg, #34d399, #10b981); width: 0%; height: 100%; border-radius: 8px; transition: width 0.3s ease; }
.subagent-progress-text { position: absolute; top: 0; left: 0; width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; font-size: 11px; font-family: monospace; color: #064e3b; font-weight: 600; }
.subagent-output { background: #ffffff; padding: 18px; border-radius: 12px; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; min-height: 60px; line-height: 1.6; border: 1px solid rgba(16, 185, 129, 0.1); font-size: 15px; color: var(--text-color, #333); box-shadow: inset 0 2px 4px rgba(0,0,0,0.02); }
.subagent-cursor { display: inline-block; width: 8px; height: 16px; background-color: #10b981; animation: blink 1s step-end infinite; vertical-align: middle; }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

/* AI Mode Switcher */
.mode-menu { position: absolute; bottom: 100%; left: 0; right: auto; background: var(--bg-alt); border: 1px solid var(--border-color); border-radius: 8px; padding: 5px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); z-index: 100; margin-bottom: 10px; display: flex; flex-direction: row; gap: 4px; white-space: nowrap; }
.mode-item { display: flex; align-items: center; justify-content: flex-start; gap: 8px; padding: 6px 12px; cursor: pointer; border-radius: 8px; color: var(--text-color); transition: 0.2s; white-space: nowrap; font-size: 14px; width: 100%; box-sizing: border-box; }
.mode-item:hover { background: var(--bg-hover); }
.mode-item.active { background: var(--accent-color); color: white; font-weight:bold; }
.mode-item.active i { stroke: white !important; }

/* Debate UI */
.debate-container { border: 1px solid var(--border-color); border-radius: 16px; margin: 15px 0; overflow: hidden; font-size: 14.5px; line-height: 1.6; box-shadow: 0 4px 20px rgba(0,0,0,0.03); background: #fff; }
.debate-stage { padding: 20px; border-bottom: 1px solid var(--border-color); transition: background 0.3s; }
.debate-stage:last-child { border-bottom: none; }
.debate-stage-title { font-weight: 600; font-size: 15px; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.debate-main-ai { background: rgba(249, 115, 22, 0.03); border-left: 4px solid #f97316; }
.debate-main-ai .debate-stage-title { color: #c2410c; }
.debate-sub-ai { background: rgba(16, 185, 129, 0.04); border-left: 4px solid #10b981; color: var(--text-color, #333); }
.debate-sub-ai .debate-stage-title { color: #059669; }
.debate-final { background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(168, 85, 247, 0.05) 100%); border-left: 4px solid #8b5cf6; }
.debate-final .debate-stage-title { color: #6d28d9; }
.debate-loading { display: inline-block; animation: pulse 1.5s infinite; color: #888; font-style: italic; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }

#personas-reset-btn {
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-muted);
    font-weight: 500;
}
#personas-reset-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}
#personas-reset-btn.active-preset {
    border-color: transparent;
    background: var(--bg-tertiary);
    color: var(--text-primary);
}


/* Canvas Preview: ensure iframe fills the entire preview area */
.canvas-content.preview-view.active {
  display: block !important;
  height: calc(100% - 0px);
  overflow: hidden;
}

.canvas-content.preview-view {
  height: 100%;
}

/* Web project card hover */
.web-project-card:hover {
  background-color: var(--bg-tertiary, #f5f5f5);
}
.web-project-download-btn:hover {
  background-color: var(--bg-tertiary, #f0f0f0) !important;
}

/* Canvas pane responsive on smaller screens */
@media (max-width: 1100px) {
  .canvas-pane.open {
    width: 50% !important;
    min-width: 320px;
  }
}

/* ═══ Advanced Tool Widgets ═══ */

/* 1. Web Article Card */
.web-article-card {
  background: var(--bg-secondary, #1e1e2d);
  border: 1px solid var(--border-color, rgba(255,255,255,0.1));
  border-radius: 12px;
  padding: 14px 18px;
  margin: 10px 0;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.web-article-header {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary, #ffffff);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.web-article-url a {
  font-size: 12px;
  color: #3b82f6;
  text-decoration: underline;
  word-break: break-all;
}
.web-article-preview {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-secondary, #a1a1aa);
  background: rgba(0,0,0,0.2);
  padding: 10px;
  border-radius: 6px;
  border-left: 3px solid #3b82f6;
}

/* 2. Code Diff Card */
.code-diff-card {
  background: #181825;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  overflow: hidden;
  margin: 12px 0;
  font-family: 'JetBrains Mono', Consolas, monospace;
}
.diff-header {
  background: rgba(255,255,255,0.05);
  padding: 10px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.diff-title {
  font-weight: 600;
  font-size: 14px;
  color: #e4e4e7;
  display: flex;
  align-items: center;
  gap: 6px;
}
.diff-copy-btn {
  background: #3b82f6;
  color: white;
  border: none;
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
  transition: opacity 0.2s;
}
.diff-copy-btn:hover { opacity: 0.9; }
.diff-body {
  max-height: 380px;
  overflow-y: auto;
  font-size: 13px;
  line-height: 1.5;
}
.diff-line {
  display: flex;
  padding: 2px 0;
  white-space: pre-wrap;
  word-break: break-all;
}
.diff-num {
  width: 32px;
  min-width: 32px;
  text-align: right;
  padding-right: 8px;
  color: #71717a;
  user-select: none;
  font-size: 11px;
}
.diff-sign {
  width: 18px;
  min-width: 18px;
  text-align: center;
  font-weight: bold;
  user-select: none;
}
.diff-text { flex: 1; }
.diff-same { background: transparent; color: #d4d4d8; }
.diff-add { background: rgba(34, 197, 94, 0.15); color: #4ade80; }
.diff-add .diff-sign { color: #22c55e; }
.diff-del { background: rgba(239, 68, 68, 0.15); color: #f87171; }
.diff-del .diff-sign { color: #ef4444; }

/* 3. 3D Flashcard Deck */
.flashcard-deck-card {
  background: var(--bg-secondary, #1f1f2e);
  border: 1px solid var(--border-color, rgba(255,255,255,0.1));
  border-radius: 14px;
  padding: 16px;
  margin: 12px 0;
  max-width: 440px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}
.deck-title {
  font-size: 15px;
  font-weight: 700;
  color: #f4f4f5;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}
.flashcard-wrapper {
  perspective: 1000px;
  height: 180px;
  cursor: pointer;
  margin-bottom: 14px;
}
.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
  transform-style: preserve-3d;
  border-radius: 12px;
}
.flashcard-wrapper.flipped .flashcard-inner {
  transform: rotateY(180deg);
}
.flashcard-front, .flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  box-sizing: border-box;
}
.flashcard-front {
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  color: white;
}
.flashcard-back {
  background: linear-gradient(135deg, #10b981, #047857);
  color: white;
  transform: rotateY(180deg);
}
.card-badge {
  font-size: 11px;
  opacity: 0.8;
  letter-spacing: 1px;
  margin-bottom: 8px;
  text-transform: uppercase;
}
.card-content {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
}
.deck-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.deck-controls button {
  background: rgba(255,255,255,0.1);
  color: white;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: background 0.2s;
}
.deck-controls button:hover { background: rgba(255,255,255,0.2); }
.card-counter { font-size: 13px; color: #a1a1aa; font-weight: 600; }

/* 4. LaTeX Step Math Card */
.step-math-card {
  background: var(--bg-secondary, #1b1b26);
  border: 1px solid var(--border-color, rgba(255,255,255,0.12));
  border-radius: 14px;
  padding: 18px;
  margin: 12px 0;
  box-shadow: 0 6px 18px rgba(0,0,0,0.15);
}
.step-math-header {
  font-size: 16px;
  font-weight: 700;
  color: #a855f7;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 10px;
}
.step-math-item {
  background: rgba(0,0,0,0.2);
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 12px;
  border-left: 3px solid #a855f7;
}
.step-math-badge {
  font-size: 13px;
  font-weight: 600;
  color: #e4e4e7;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.step-idx {
  background: #a855f7;
  color: white;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  font-size: 11px;
}
.step-math-formula {
  overflow-x: auto;
  padding: 8px 0;
  font-size: 15px;
}
.step-math-exp {
  font-size: 12px;
  color: #a1a1aa;
  margin-top: 4px;
  line-height: 1.4;
}

/* 5. Super Math Calculator Card UI */
.math-calc-card {
  background: var(--bg-secondary, #1a1a27);
  border: 1px solid var(--border-color, rgba(255,255,255,0.12));
  border-radius: 14px;
  padding: 16px 20px;
  margin: 12px 0;
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
  font-family: system-ui, -apple-system, sans-serif;
}
.math-calc-header {
  font-size: 14px;
  font-weight: 700;
  color: #38bdf8;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 8px;
}
.math-calc-expr {
  background: rgba(0,0,0,0.25);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 12px;
  overflow-x: auto;
  font-size: 16px;
  border-left: 4px solid #38bdf8;
}
.math-calc-result-box {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.math-calc-row {
  font-size: 13px;
  color: #e4e4e7;
  display: flex;
  align-items: center;
  gap: 8px;
  word-break: break-all;
}
.math-calc-label {
  color: #a1a1aa;
  font-weight: 600;
  min-width: 120px;
}
.math-calc-val {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-weight: 600;
  color: #4ade80;
}
.compare-badge {
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
  line-height: 1.4;
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.badge-true {
  background: rgba(34, 197, 94, 0.15);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #4ade80;
}
.badge-false {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #f87171;
}
.math-calc-actions {
  margin-top: 12px;
  display: flex;
  justify-content: flex-end;
}
.math-calc-actions button {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  color: #e4e4e7;
  border-radius: 6px;
  padding: 4px 12px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.math-calc-actions button:hover {
  background: rgba(255,255,255,0.18);
}

/* 6. Algorithmic Engines UI Cards */
/* Logic & Game Theory Engine Card */
.logic-engine-card {
  background: var(--bg-secondary, #1a1a27);
  border: 1px solid rgba(168, 85, 247, 0.3);
  border-radius: 14px;
  padding: 16px 20px;
  margin: 12px 0;
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}
.logic-engine-header {
  font-size: 14px;
  font-weight: 700;
  color: #c084fc;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 8px;
}
.logic-engine-query {
  font-size: 13px;
  color: #a1a1aa;
  margin-bottom: 12px;
}
.logic-stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}
.logic-stat-item {
  background: rgba(0,0,0,0.25);
  border-radius: 10px;
  padding: 10px 14px;
  text-align: center;
}
.stat-title {
  font-size: 12px;
  color: #a1a1aa;
  margin-bottom: 4px;
}
.stat-value {
  font-size: 20px;
  font-weight: 800;
  font-family: 'JetBrains Mono', Consolas, monospace;
}
.text-blue { color: #60a5fa; }
.text-green { color: #4ade80; }
.logic-engine-badge {
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.3);
  color: #e9d5ff;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  line-height: 1.4;
}
.bayes-formula {
  background: rgba(0,0,0,0.25);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 12px;
  font-family: monospace;
  font-size: 13px;
  color: #38bdf8;
}

/* Linter Diag Card */
.linter-diag-card {
  background: var(--bg-secondary, #1a1a27);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 14px;
  padding: 16px 20px;
  margin: 12px 0;
}
.linter-header {
  font-size: 14px;
  font-weight: 700;
  color: #60a5fa;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 8px;
}
.linter-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 12px;
  margin-bottom: 6px;
}
.linter-pass { background: rgba(34, 197, 94, 0.15); color: #4ade80; }
.linter-error { background: rgba(239, 68, 68, 0.15); color: #f87171; }
.linter-tag { font-weight: 800; font-size: 11px; padding: 2px 6px; border-radius: 4px; background: rgba(255,255,255,0.1); }

/* ToT Tree Card */
.tot-tree-card {
  background: var(--bg-secondary, #1a1a27);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: 14px;
  padding: 16px 20px;
  margin: 12px 0;
}
.tot-header {
  font-size: 14px;
  font-weight: 700;
  color: #4ade80;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 8px;
}
.tot-problem {
  font-size: 13px;
  color: #e4e4e7;
  font-weight: 600;
  margin-bottom: 12px;
}
.tot-branches {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 12px;
}
.tot-branch-item {
  background: rgba(0,0,0,0.2);
  border-radius: 8px;
  padding: 10px 14px;
  border-left: 3px solid #64748b;
}
.tot-branch-item.best-branch {
  border-left-color: #4ade80;
  background: rgba(34, 197, 94, 0.08);
}
.tot-branch-title {
  display: flex;
  justify-content: space-between;
  font-weight: 700;
  font-size: 13px;
  color: #f4f4f5;
  margin-bottom: 4px;
}
.tot-score-badge {
  background: #334155;
  color: #38bdf8;
  font-size: 11px;
  padding: 1px 8px;
  border-radius: 10px;
}
.tot-branch-hypo { font-size: 12px; color: #a1a1aa; margin-bottom: 4px; }
.tot-branch-pro { font-size: 11px; color: #4ade80; }
.tot-branch-con { font-size: 11px; color: #f87171; }
.tot-winner-badge {
  background: rgba(34, 197, 94, 0.15);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #4ade80;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Task Planner Card */
.task-planner-card {
  background: var(--bg-secondary, #1a1a27);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: 14px;
  padding: 16px 20px;
  margin: 12px 0;
}
.planner-header {
  font-size: 14px;
  font-weight: 700;
  color: #fbbf24;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 8px;
}
.planner-goal { font-size: 13px; font-weight: 600; color: #f3f4f6; margin-bottom: 12px; }
.planner-steps { display: flex; flex-direction: column; gap: 8px; }
.plan-step-item { display: flex; gap: 10px; background: rgba(0,0,0,0.2); padding: 8px 12px; border-radius: 8px; align-items: flex-start; }
.plan-step-num { background: #f59e0b; color: #000; font-weight: 800; font-size: 11px; padding: 2px 6px; border-radius: 4px; white-space: nowrap; margin-top: 2px; }
.plan-step-act { font-size: 12px; color: #e5e7eb; font-weight: 600; }
.plan-step-exp { font-size: 11px; color: #9ca3af; margin-top: 2px; }

/* ═══ ABOUT AI MODAL STYLES ═══ */
.ai-about-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    width: 620px;
    max-width: 92vw;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
    animation: scaleIn 0.25s var(--ease-spring);
    position: relative;
}

.ai-about-hero {
    position: relative;
    padding: 28px 24px 20px;
    background: linear-gradient(135deg, rgba(251, 140, 0, 0.12) 0%, rgba(139, 92, 246, 0.08) 100%);
    border-bottom: 1px solid var(--border-color);
}

.ai-about-close-btn {
    position: absolute;
    top: 16px;
    right: 16px;
}

.ai-about-brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.ai-about-logo-wrapper {
    width: 56px;
    height: 56px;
    flex-shrink: 0;
}

.ai-about-logo {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 4px 12px rgba(251, 140, 0, 0.4));
}

.ai-about-title-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ai-about-title-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ai-about-title-row h2 {
    font-size: 22px;
    font-weight: 800;
    font-family: var(--font-display);
    color: var(--text-primary);
    margin: 0;
    letter-spacing: -0.5px;
}

.ai-about-badge {
    background: linear-gradient(135deg, #fb8c00, #e65100);
    color: #ffffff;
    font-size: 11px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 20px;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 6px rgba(251, 140, 0, 0.3);
}

.ai-about-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0;
}

/* Tabs */
.ai-about-tabs {
    display: flex;
    gap: 6px;
    padding: 10px 16px;
    background: var(--bg-tertiary, rgba(0,0,0,0.03));
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
}

.ai-about-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.ai-about-tab i {
    width: 15px;
    height: 15px;
}

.ai-about-tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.06);
}

.ai-about-tab.active {
    color: var(--accent, #fb8c00);
    background: var(--bg-secondary);
    box-shadow: var(--shadow-sm);
}

/* Body & Tab Content */
.ai-about-body {
    padding: 20px 24px;
    flex: 1;
    overflow-y: auto;
    max-height: 380px;
}

.ai-about-tab-content {
    animation: fadeIn 0.2s ease;
}

/* Features Grid */
.ai-feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

@media (max-width: 540px) {
    .ai-feature-grid {
        grid-template-columns: 1fr;
    }
}

.ai-feature-card {
    display: flex;
    gap: 12px;
    padding: 14px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.ai-feature-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-subtle, rgba(251, 140, 0, 0.3));
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.ai-feature-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ai-feature-icon i {
    width: 18px;
    height: 18px;
}

.ai-feature-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ai-feature-info h4 {
    margin: 0;
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
}

.ai-feature-info p {
    margin: 0;
    font-size: 11.5px;
    color: var(--text-secondary);
    line-height: 1.45;
}

/* Models List */
.ai-models-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ai-model-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.ai-model-tag {
    font-size: 11px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 6px;
    white-space: nowrap;
    min-width: 110px;
    text-align: center;
}

.tag-primary { background: rgba(251, 140, 0, 0.15); color: #fb8c00; }
.tag-purple { background: rgba(139, 92, 246, 0.15); color: #8b5cf6; }
.tag-orange { background: rgba(245, 158, 11, 0.15); color: #f59e0b; }
.tag-green { background: rgba(16, 185, 129, 0.15); color: #10b981; }
.tag-blue { background: rgba(59, 130, 246, 0.15); color: #3b82f6; }

.ai-model-details {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.ai-model-details strong {
    font-size: 12.5px;
    color: var(--text-primary);
}

.ai-model-details span {
    font-size: 11.5px;
    color: var(--text-secondary);
}

/* Arch Specs */
.ai-arch-specs {
    display: flex;
    flex-direction: column;
    gap: 1px;
    background: var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.ai-arch-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-primary);
}

.ai-arch-label {
    font-size: 12.5px;
    font-weight: 600;
    color: var(--text-secondary);
}

.ai-arch-value {
    font-size: 12px;
    font-weight: 600;
    font-family: var(--font-mono, monospace);
    color: var(--accent, #fb8c00);
}

/* Shortcuts */
.ai-shortcuts-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ai-shortcut-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 13px;
    color: var(--text-primary);
}

.kbd-group {
    display: flex;
    align-items: center;
    gap: 4px;
}

kbd {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.2);
    border-radius: 5px;
    padding: 3px 7px;
    font-family: var(--font-mono, monospace);
    font-size: 11px;
    font-weight: 700;
    color: var(--text-primary);
}

/* About Footer */
.ai-about-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 24px;
    background: var(--bg-tertiary, rgba(0,0,0,0.03));
    border-top: 1px solid var(--border-color);
}

.ai-about-stats {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: var(--text-secondary);
}

.ai-about-stats span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.ai-about-stats i {
    width: 14px;
    height: 14px;
    color: #10b981;
}