/* ===================================================================
   Interactive 3D E-School - Design System & Modern Glassmorphism CSS
   Hacktoberfest Rwanda x Build54 Africa Hackathon Entry
   =================================================================== */

:root {
    /* Color Palette */
    --bg-main: #090c15;
    --bg-surface: #0f1524;
    --bg-card: rgba(18, 25, 42, 0.75);
    --bg-card-hover: rgba(26, 36, 60, 0.85);
    --bg-glass: rgba(15, 21, 36, 0.65);
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-bright: rgba(255, 255, 255, 0.18);
    --border-glow: rgba(56, 189, 248, 0.35);

    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-inverse: #090c15;

    /* Theme Accents */
    --accent-cyan: #38bdf8;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --accent-rose: #f43f5e;

    /* Subject specific highlights */
    --subject-bio: #10b981;
    --subject-phys: #38bdf8;
    --subject-chem: #ec4899;

    /* UI Measurements & Shadows */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 24px rgba(56, 189, 248, 0.25);
    --shadow-glow-emerald: 0 0 20px rgba(16, 185, 129, 0.25);

    /* Fonts */
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition-fast: 0.15s ease;
    --transition-norm: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    overflow: hidden;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Main App Shell Layout */
.app-layout {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    background: radial-gradient(circle at 15% 15%, rgba(30, 58, 138, 0.12) 0%, transparent 45%),
                radial-gradient(circle at 85% 85%, rgba(139, 92, 246, 0.08) 0%, transparent 45%),
                var(--bg-main);
}

/* ===================================================================
   Header & Navigation
   =================================================================== */
.app-header {
    height: 64px;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 50;
    flex-shrink: 0;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo-glow {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 16px rgba(56, 189, 248, 0.4);
    color: #fff;
}

.brand-icon {
    width: 22px;
    height: 22px;
}

.brand-titles {
    display: flex;
    flex-direction: column;
}

.brand-title-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-name {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(90deg, #ffffff 40%, #93c5fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hackathon-tag {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.brand-subtitle {
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* Subject Tabs */
.subject-nav {
    display: flex;
    align-items: center;
    background: rgba(18, 25, 42, 0.6);
    border: 1px solid var(--border-subtle);
    padding: 4px;
    border-radius: var(--radius-full);
    gap: 4px;
}

.nav-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-size: 0.88rem;
    font-weight: 500;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-tab.active {
    color: #fff;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.25), rgba(139, 92, 246, 0.25));
    border: 1px solid rgba(56, 189, 248, 0.4);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.tab-emoji {
    font-size: 1rem;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ai-status-pill {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.25);
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    color: #34d399;
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #10b981;
    box-shadow: 0 0 8px #10b981;
    animation: statusPulse 2s infinite ease-in-out;
}

@keyframes statusPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.85); }
}

.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--border-bright);
}

.icon-btn svg {
    width: 18px;
    height: 18px;
}

/* ===================================================================
   Main Workspace Grid Layout
   =================================================================== */
.workspace-grid {
    display: grid;
    grid-template-columns: 1fr 420px;
    height: calc(100vh - 64px);
    width: 100vw;
    overflow: hidden;
}

@media (max-width: 1024px) {
    .workspace-grid {
        grid-template-columns: 1fr;
        grid-template-rows: 55% 45%;
    }
}

/* ===================================================================
   3D Viewport Area
   =================================================================== */
.viewport-section {
    position: relative;
    width: 100%;
    height: 100%;
    background: #040711;
    overflow: hidden;
}

.canvas-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
}

#three-canvas {
    width: 100%;
    height: 100%;
    display: block;
    outline: none;
}

/* Top Viewport HUD */
.viewport-hud-top {
    position: absolute;
    top: 16px;
    left: 16px;
    right: 16px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    pointer-events: none;
    z-index: 10;
}

.scene-badge {
    pointer-events: auto;
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(15, 21, 38, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-subtle);
    padding: 10px 16px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.scene-badge-icon {
    font-size: 1.5rem;
}

.scene-badge-title {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    line-height: 1.2;
}

.scene-badge-desc {
    font-size: 0.74rem;
    color: var(--text-muted);
}

/* Quick Tools Bar */
.viewport-quick-tools {
    pointer-events: auto;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* HERO SNAP BUTTON */
.snap-ai-pill-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(56, 189, 248, 0.6);
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.3), rgba(99, 102, 241, 0.35));
    color: #fff;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 0 16px rgba(56, 189, 248, 0.35);
    transition: all var(--transition-fast);
    backdrop-filter: blur(8px);
}

.snap-ai-pill-btn:hover {
    transform: translateY(-1px);
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.5), rgba(99, 102, 241, 0.55));
    box-shadow: 0 0 24px rgba(56, 189, 248, 0.6);
    border-color: #38bdf8;
}

.snap-ai-pill-btn .btn-icon {
    width: 16px;
    height: 16px;
    color: #38bdf8;
}

.hotkey-badge {
    font-size: 0.8rem;
}

.hud-icon-btn {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    background: rgba(15, 21, 38, 0.75);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.hud-icon-btn:hover {
    color: #fff;
    background: rgba(25, 35, 60, 0.9);
    border-color: var(--border-bright);
}

.hud-icon-btn svg {
    width: 18px;
    height: 18px;
}

/* Bottom Viewport HUD (Controls) */
.viewport-hud-bottom {
    position: absolute;
    bottom: 16px;
    left: 16px;
    right: 16px;
    z-index: 10;
    pointer-events: none;
}

.subject-controls {
    pointer-events: auto;
    background: rgba(12, 17, 32, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 14px 18px;
    box-shadow: var(--shadow-md);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.control-group label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.control-group label svg {
    width: 14px;
    height: 14px;
}

.btn-pill-group {
    display: flex;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-full);
    padding: 2px;
    gap: 2px;
}

.pill-option {
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 500;
    padding: 5px 12px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pill-option:hover {
    color: #fff;
}

.pill-option.active {
    background: var(--accent-emerald);
    color: #042f1f;
    font-weight: 700;
}

.action-btn-sm {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.action-btn-sm:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--border-bright);
}

.action-btn-sm svg {
    width: 14px;
    height: 14px;
}

/* Physics Slider Grid */
.control-slider-grid {
    display: flex;
    gap: 16px;
    flex: 1;
    min-width: 320px;
}

.slider-box {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.slider-label-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.76rem;
    color: var(--text-secondary);
}

.slider-label-row b {
    color: var(--accent-cyan);
    font-family: var(--font-mono);
}

.slider-box input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 5px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.15);
    outline: none;
}

.slider-box input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-cyan);
    cursor: pointer;
    box-shadow: 0 0 8px var(--accent-cyan);
    transition: transform var(--transition-fast);
}

.slider-box input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.hud-select, .hud-select-wide {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-subtle);
    color: #fff;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
    font-family: var(--font-sans);
    outline: none;
}

.hud-select-wide {
    min-width: 280px;
    padding: 6px 10px;
}

.physics-action-row, .chemistry-action-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.action-btn-primary {
    display: flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, #0284c7, #2563eb);
    color: #fff;
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-size: 0.84rem;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    box-shadow: 0 0 14px rgba(37, 99, 235, 0.4);
    transition: all var(--transition-fast);
}

.action-btn-primary:hover {
    background: linear-gradient(135deg, #0ea5e9, #3b82f6);
    transform: translateY(-1px);
}

.action-btn-secondary {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
    padding: 8px 14px;
    border-radius: var(--radius-md);
    font-size: 0.84rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.action-btn-secondary:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.14);
}

.telemetry-readout, .chem-telemetry {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 4px 12px;
    background: rgba(0, 0, 0, 0.35);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.telemetry-item {
    font-size: 0.74rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
}

.telemetry-item span {
    color: #38bdf8;
    font-weight: 700;
}

/* Chemistry buttons */
.chem-btn {
    border-color: rgba(236, 72, 153, 0.3);
}

.chem-btn:hover {
    background: rgba(236, 72, 153, 0.15);
    border-color: #ec4899;
}

/* Chemistry Manual Substance Selection Grid */
.substance-selector-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
}

.substance-pickers-row {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    flex-wrap: wrap;
    width: 100%;
}

.substance-select-box {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
    min-width: 170px;
}

.substance-select-box label {
    font-size: 0.74rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.substance-select-box label svg {
    width: 13px;
    height: 13px;
    color: #ec4899;
}

.substance-select-box select {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #fff;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-family: var(--font-sans);
    outline: none;
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.substance-select-box select:focus {
    border-color: #ec4899;
}

.substance-select-box select option {
    background: #0f172a;
    color: #fff;
}

.btn-chem-react-hero {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, #ec4899, #f59e0b);
    color: #fff;
    border: none;
    padding: 7px 18px;
    border-radius: var(--radius-md);
    font-size: 0.84rem;
    font-weight: 700;
    font-family: var(--font-sans);
    cursor: pointer;
    box-shadow: 0 0 16px rgba(236, 72, 153, 0.4);
    transition: all var(--transition-fast);
    white-space: nowrap;
    height: 34px;
}

.btn-chem-react-hero:hover {
    transform: translateY(-1px);
    box-shadow: 0 0 24px rgba(245, 158, 11, 0.6);
}

.btn-chem-react-hero svg {
    width: 15px;
    height: 15px;
}

/* 3D Raycasting Tooltip */
.canvas-3d-tooltip {
    position: absolute;
    bottom: 110px;
    left: 24px;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(14px);
    border: 1px solid rgba(16, 185, 129, 0.4);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.25);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    max-width: 280px;
    z-index: 20;
    pointer-events: auto;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.tooltip-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.tooltip-header strong {
    font-size: 0.92rem;
    color: #34d399;
}

.canvas-3d-tooltip p {
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 10px;
}

.tooltip-ask-btn {
    width: 100%;
    padding: 5px 8px;
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid rgba(16, 185, 129, 0.4);
    color: #a7f3d0;
    font-size: 0.74rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tooltip-ask-btn:hover {
    background: rgba(16, 185, 129, 0.35);
    color: #fff;
}

/* ===================================================================
   Right Column: AI Multimodal Tutor Chat Panel
   =================================================================== */
.chat-section {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--bg-surface);
    border-left: 1px solid var(--border-subtle);
    position: relative;
    overflow: hidden;
}

/* Tutor Persona Header */
.tutor-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-subtle);
    background: rgba(12, 17, 32, 0.6);
}

.tutor-profile {
    display: flex;
    align-items: center;
    gap: 12px;
}

.tutor-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(56, 189, 248, 0.2));
    border: 2px solid rgba(56, 189, 248, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.tutor-details {
    display: flex;
    flex-direction: column;
}

.tutor-name-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tutor-name {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
}

.ai-badge {
    font-size: 0.65rem;
    font-weight: 700;
    background: linear-gradient(90deg, #3b82f6, #8b5cf6);
    color: #fff;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    letter-spacing: 0.03em;
}

.tutor-specialty {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.tutor-controls {
    display: flex;
    gap: 6px;
}

.chat-icon-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chat-icon-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--border-subtle);
}

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

/* Chat Messages Stream */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    scroll-behavior: smooth;
}

/* Custom Scrollbar */
.chat-messages::-webkit-scrollbar {
    width: 6px;
}
.chat-messages::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
}
.chat-messages::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

.message {
    display: flex;
    gap: 10px;
    max-width: 92%;
    animation: messageSlideIn 0.25s ease-out;
}

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

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

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

.message-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.message.tutor .message-avatar {
    background: rgba(56, 189, 248, 0.15);
    border: 1px solid rgba(56, 189, 248, 0.3);
}

.message.user .message-avatar {
    background: rgba(139, 92, 246, 0.25);
    border: 1px solid rgba(139, 92, 246, 0.4);
}

.message-body {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.message-bubble {
    padding: 10px 14px;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    line-height: 1.5;
    position: relative;
    word-break: break-word;
}

.message.user .message-bubble {
    background: linear-gradient(135deg, #4f46e5, #6366f1);
    color: #fff;
    border-bottom-right-radius: 2px;
}

.message.tutor .message-bubble {
    background: rgba(20, 28, 48, 0.9);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    border-bottom-left-radius: 2px;
}

/* Markdown typography inside tutor bubble */
.message-bubble h1, .message-bubble h2, .message-bubble h3 {
    margin-top: 8px;
    margin-bottom: 4px;
    color: #fff;
    font-size: 0.95rem;
}

.message-bubble p {
    margin-bottom: 6px;
}

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

.message-bubble ul, .message-bubble ol {
    margin-left: 18px;
    margin-bottom: 8px;
}

.message-bubble li {
    margin-bottom: 3px;
}

.message-bubble code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background: rgba(0, 0, 0, 0.35);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    color: #38bdf8;
}

.message-bubble pre {
    background: rgba(0, 0, 0, 0.5);
    padding: 10px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 8px 0;
}

.message-bubble table {
    width: 100%;
    border-collapse: collapse;
    margin: 8px 0;
    font-size: 0.8rem;
}

.message-bubble th, .message-bubble td {
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 5px 8px;
    text-align: left;
}

.message-bubble th {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
}

.message-bubble blockquote {
    border-left: 3px solid var(--accent-cyan);
    padding-left: 8px;
    margin: 6px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.message-snapshot-img {
    max-width: 100%;
    max-height: 160px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.15);
    margin-bottom: 6px;
    display: block;
}

.message-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.tts-speak-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 3px;
    font-size: 0.7rem;
    transition: color var(--transition-fast);
}

.tts-speak-btn:hover {
    color: var(--accent-cyan);
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 10px 14px;
    background: rgba(20, 28, 48, 0.7);
    border-radius: var(--radius-md);
    width: fit-content;
    border: 1px solid var(--border-subtle);
}

.typing-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-cyan);
    animation: typingBounce 1.4s infinite ease-in-out;
}

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

@keyframes typingBounce {
    0%, 80%, 100% { transform: translateY(0); opacity: 0.4; }
    40% { transform: translateY(-5px); opacity: 1; }
}

/* Quick Inquiry Chips */
.quick-inquiry-bar {
    padding: 6px 14px;
    display: flex;
    align-items: center;
    gap: 6px;
    overflow-x: auto;
    background: rgba(10, 14, 26, 0.5);
    border-top: 1px solid var(--border-subtle);
}

.quick-inquiry-bar::-webkit-scrollbar {
    height: 3px;
}

.chips-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    white-space: nowrap;
}

.inquiry-chip {
    white-space: nowrap;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.74rem;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.inquiry-chip:hover {
    color: #fff;
    background: rgba(56, 189, 248, 0.15);
    border-color: rgba(56, 189, 248, 0.35);
}

/* Snapshot Preview Container */
.snap-preview-container {
    padding: 8px 14px;
    background: rgba(14, 20, 36, 0.9);
    border-top: 1px solid rgba(56, 189, 248, 0.3);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideUp 0.2s ease;
}

@keyframes slideUp {
    from { transform: translateY(10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.snap-thumb-wrapper {
    position: relative;
    width: 60px;
    height: 42px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--accent-cyan);
    flex-shrink: 0;
}

.snap-thumb-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.snap-remove-btn {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.75);
    border: none;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.snap-remove-btn svg {
    width: 10px;
    height: 10px;
}

.snap-meta {
    display: flex;
    flex-direction: column;
}

.snap-title {
    font-size: 0.78rem;
    font-weight: 600;
    color: #38bdf8;
    display: flex;
    align-items: center;
    gap: 4px;
}

.snap-title svg {
    width: 14px;
    height: 14px;
}

.snap-hint {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Chat Input Bar */
.chat-input-form {
    padding: 12px 14px;
    background: rgba(10, 14, 26, 0.9);
    border-top: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

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

.tool-btn-camera {
    display: flex;
    align-items: center;
    gap: 5px;
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.25);
    color: #38bdf8;
    font-family: var(--font-sans);
    font-size: 0.76rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tool-btn-camera:hover {
    background: rgba(56, 189, 248, 0.2);
    border-color: #38bdf8;
}

.tool-btn-camera svg {
    width: 14px;
    height: 14px;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 6px 10px;
    transition: border-color var(--transition-fast);
}

.input-wrapper:focus-within {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.input-wrapper textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: #fff;
    font-family: var(--font-sans);
    font-size: 0.88rem;
    resize: none;
    outline: none;
    max-height: 100px;
    line-height: 1.4;
    padding: 4px 0;
}

.input-wrapper textarea::placeholder {
    color: var(--text-muted);
}

.send-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    border: none;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.send-btn:hover {
    transform: scale(1.05);
}

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

/* ===================================================================
   Modals
   =================================================================== */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(4, 7, 15, 0.75);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 20px;
    animation: fadeIn 0.2s ease;
}

.modal-card {
    background: #0f1526;
    border: 1px solid var(--border-bright);
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 480px;
    overflow: hidden;
}

.guide-card {
    max-width: 640px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.02);
}

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

.modal-icon {
    width: 20px;
    height: 20px;
    color: var(--accent-cyan);
}

.modal-icon.accent {
    color: #f59e0b;
}

.modal-header h3 {
    font-size: 1.05rem;
    font-weight: 700;
}

.modal-close-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close-btn:hover {
    color: #fff;
}

.modal-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.modal-text {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.modal-input {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 10px 14px;
    color: #fff;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    outline: none;
}

.modal-input:focus {
    border-color: var(--accent-cyan);
}

.form-hint {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.modal-info-box {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(56, 189, 248, 0.08);
    border: 1px solid rgba(56, 189, 248, 0.2);
    padding: 8px 12px;
    border-radius: var(--radius-md);
    font-size: 0.78rem;
    color: #7dd3fc;
}

.modal-info-box a {
    color: #38bdf8;
    text-decoration: underline;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 14px 20px;
    border-top: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.02);
}

.btn-cancel {
    padding: 8px 16px;
    border-radius: var(--radius-md);
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 0.84rem;
    cursor: pointer;
}

.btn-save {
    padding: 8px 18px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    border: none;
    color: #fff;
    font-weight: 600;
    font-size: 0.84rem;
    cursor: pointer;
}

/* Guide feature grid */
.guide-feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 6px;
}

.feature-item {
    display: flex;
    gap: 10px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-subtle);
    padding: 12px;
    border-radius: var(--radius-md);
}

.feature-icon {
    font-size: 1.4rem;
}

.feature-item strong {
    font-size: 0.85rem;
    color: #fff;
    display: block;
    margin-bottom: 2px;
}

.feature-item p {
    font-size: 0.74rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.adaption-badge-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 6px;
}

.cloud-tag {
    font-size: 0.72rem;
    background: rgba(56, 189, 248, 0.12);
    color: #38bdf8;
    border: 1px solid rgba(56, 189, 248, 0.25);
    padding: 4px 10px;
    border-radius: var(--radius-full);
}

/* Utilities */
.hidden {
    display: none !important;
}