/* ============================================================
   styles.css — Design System for 3D Traffic Safety Simulation
   ============================================================ */

/* --- IMPORTS --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

/* --- CSS VARIABLES --- */
:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: rgba(255,255,255,0.06);
    --bg-glass: rgba(255,255,255,0.08);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-blue: #0ea5e9;
    --accent-purple: #8b5cf6;
    --accent-cyan: #06b6d4;
    --danger: #ef4444;
    --warning: #f59e0b;
    --success: #10b981;
    --info: #3b82f6;
    --border: rgba(255,255,255,0.1);
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 8px 32px rgba(0,0,0,0.4);
    --font: 'Inter', -apple-system, sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- RESET --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* --- VIEWS --- */
.view { display: none; position: absolute; inset: 0; opacity: 0; transition: opacity 0.4s ease; }
.view.active { display: block; opacity: 1; z-index: 1; }
.view.exiting { opacity: 0; }

/* ============================================================
   LOADER
   ============================================================ */
#loader {
    position: fixed; inset: 0; z-index: 9999;
    background: var(--bg-primary);
    display: flex; flex-direction: column;
    align-items: center; justify-content: center; gap: 20px;
    transition: opacity 0.6s ease;
}
#loader.fade-out { opacity: 0; pointer-events: none; }
.loader-spinner {
    width: 48px; height: 48px;
    border: 3px solid var(--border);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
.loader-text { color: var(--text-secondary); font-size: 15px; font-weight: 600; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   LANDING PAGE
   ============================================================ */
#view-landing { overflow-y: auto; }
.landing-overlay {
    position: relative; z-index: 2;
    min-height: 100vh; padding: 40px 24px 60px;
    background: linear-gradient(180deg, rgba(15,23,42,0.6) 0%, var(--bg-primary) 30%);
}

/* Header */
.landing-header { text-align: center; padding: 30px 0 40px; }
.header-badge {
    display: inline-block; padding: 6px 18px; border-radius: 24px;
    background: rgba(14,165,233,0.15); color: var(--accent-blue);
    font-size: 13px; font-weight: 700; letter-spacing: 0.5px;
    border: 1px solid rgba(14,165,233,0.3); margin-bottom: 20px;
}
.hero-title {
    font-size: clamp(28px, 5vw, 52px); font-weight: 900;
    line-height: 1.2; margin-bottom: 12px;
    background: linear-gradient(135deg, #f1f5f9 0%, #94a3b8 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-accent {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle { color: var(--text-secondary); font-size: 15px; font-weight: 500; margin-bottom: 16px; }
.hero-meta { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.meta-item {
    padding: 6px 14px; border-radius: 20px;
    background: var(--bg-glass); color: var(--text-secondary);
    font-size: 13px; font-weight: 600; border: 1px solid var(--border);
}

/* Progress */
.progress-section {
    max-width: 600px; margin: 0 auto 30px; padding: 20px;
    background: var(--bg-glass); border-radius: var(--radius);
    border: 1px solid var(--border); backdrop-filter: blur(10px);
}
.progress-header { display: flex; justify-content: space-between; margin-bottom: 10px; }
.progress-label { font-size: 14px; font-weight: 600; color: var(--text-secondary); }
.progress-percent { font-size: 14px; font-weight: 800; color: var(--accent-blue); }
.progress-track {
    height: 8px; background: rgba(255,255,255,0.1); border-radius: 4px; overflow: hidden;
}
.progress-fill {
    height: 100%; border-radius: 4px; transition: width 0.8s ease;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
}
.progress-stats {
    display: flex; gap: 12px; margin-top: 12px; align-items: center; flex-wrap: wrap;
    font-size: 13px; color: var(--text-muted);
}
.btn-summary {
    padding: 6px 14px; border-radius: 8px; border: none; cursor: pointer;
    background: var(--accent-blue); color: white; font-weight: 700; font-size: 12px;
    font-family: var(--font); transition: var(--transition);
}
.btn-summary:hover { background: #0284c7; transform: translateY(-1px); }
.btn-reset {
    margin-top: 10px; padding: 6px 14px; border-radius: 8px;
    border: 1px solid var(--border); background: transparent;
    color: var(--text-muted); cursor: pointer; font-size: 12px;
    font-family: var(--font); transition: var(--transition);
}
.btn-reset:hover { border-color: var(--danger); color: var(--danger); }

/* Route label */
.route-label {
    display: flex; align-items: center; justify-content: center; gap: 8px;
    margin-bottom: 24px; color: var(--text-muted); font-size: 14px; font-weight: 600;
}
.route-icon { font-size: 20px; }

/* Scenario Grid */
.scenario-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px; max-width: 1000px; margin: 0 auto;
}
.scenario-card {
    position: relative; padding: 24px; border-radius: var(--radius);
    background: var(--bg-card); border: 1px solid var(--border);
    cursor: pointer; transition: all 0.35s ease;
    overflow: hidden; opacity: 0; transform: translateY(20px);
}
.scenario-card.visible { opacity: 1; transform: translateY(0); }
.scenario-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: var(--card-color, var(--accent-blue));
    opacity: 0.7; transition: height 0.3s;
}
.scenario-card:hover {
    transform: translateY(-4px); border-color: var(--card-color, var(--accent-blue));
    box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}
.scenario-card:hover::before { height: 4px; opacity: 1; }
.scenario-card.completed { border-color: rgba(255,255,255,0.15); }
.scenario-card.severity-safe { border-color: rgba(16,185,129,0.4); }
.scenario-card.severity-critical { border-color: rgba(239,68,68,0.3); }
.card-number {
    position: absolute; top: 16px; right: 16px;
    font-size: 32px; font-weight: 900; color: rgba(255,255,255,0.06);
    line-height: 1;
}
.card-icon { font-size: 32px; margin-bottom: 10px; }
.card-title { font-size: 16px; font-weight: 700; margin-bottom: 4px; line-height: 1.3; }
.card-subtitle { font-size: 13px; color: var(--text-muted); margin-bottom: 12px; }
.card-status {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: 11px; font-weight: 700; padding: 4px 10px;
    border-radius: 6px; text-transform: uppercase;
}
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.status-critical { color: var(--danger); background: rgba(239,68,68,0.15); }
.status-high { color: var(--warning); background: rgba(245,158,11,0.15); }
.status-medium { color: var(--info); background: rgba(59,130,246,0.15); }
.status-safe { color: var(--success); background: rgba(16,185,129,0.15); }
.card-arrow {
    position: absolute; bottom: 16px; right: 16px;
    font-size: 18px; color: var(--text-muted); transition: var(--transition);
}
.scenario-card:hover .card-arrow { color: var(--accent-blue); transform: translateX(4px); }

/* Footer */
.landing-footer { text-align: center; margin-top: 60px; color: var(--text-muted); font-size: 13px; }

/* ============================================================
   SCENARIO VIEW
   ============================================================ */
#view-scenario { background: #000; }
.scene-loader {
    position: absolute; inset: 0; z-index: 5;
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px;
    background: var(--bg-primary);
    transition: opacity 0.4s;
}
.scenario-canvas {
    position: absolute; inset: 0; z-index: 1;
    width: 100%; height: 100%;
}
.scenario-canvas canvas {
    display: block; width: 100% !important; height: 100% !important;
}
.scenario-ui { position: absolute; inset: 0; z-index: 10; pointer-events: none; }
.scenario-ui > * { pointer-events: auto; }

/* Top bar */
.sc-topbar {
    display: flex; align-items: center; gap: 12px;
    padding: 12px 16px;
    background: rgba(15,23,42,0.7); backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}
.btn-back {
    padding: 8px 14px; border-radius: 8px; border: 1px solid var(--border);
    background: rgba(255,255,255,0.08); color: var(--text-primary);
    font-family: var(--font); font-size: 13px; font-weight: 600;
    cursor: pointer; transition: var(--transition);
}
.btn-back:hover { background: rgba(255,255,255,0.15); }
.sc-location { display: flex; align-items: center; gap: 8px; }
.sc-num {
    padding: 3px 8px; border-radius: 6px;
    background: var(--accent-blue); color: white;
    font-size: 11px; font-weight: 800;
}
.sc-name { font-size: 14px; font-weight: 700; }

.sc-signal-strip {
    position: absolute; top: 62px; left: 16px; right: 16px;
    display: flex; gap: 8px; flex-wrap: wrap;
    pointer-events: none;
}
.scene-chip {
    padding: 7px 10px; border-radius: 8px;
    background: rgba(15,23,42,0.72);
    border: 1px solid rgba(255,255,255,0.14);
    color: var(--text-primary); font-size: 12px; font-weight: 700;
    backdrop-filter: blur(10px);
}

/* Street View Panel */
.sc-streetview-toggle {
    position: absolute; top: 62px; right: 16px;
    z-index: 20;
}
.btn-streetview {
    padding: 8px 14px; border-radius: 8px;
    border: 1px solid rgba(16, 185, 129, 0.4);
    background: rgba(16, 185, 129, 0.15);
    color: #10b981; font-size: 13px; font-weight: 600;
    cursor: pointer; transition: var(--transition);
    backdrop-filter: blur(10px);
}
.btn-streetview:hover {
    background: rgba(16, 185, 129, 0.3);
    border-color: rgba(16, 185, 129, 0.6);
}
.sc-streetview-panel {
    position: absolute; top: 100px; right: 16px;
    width: 420px; max-width: calc(100% - 32px);
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(16px);
    border-radius: var(--radius);
    border: 1px solid rgba(16, 185, 129, 0.3);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
    z-index: 25;
    overflow: hidden;
    transition: opacity 0.3s ease, transform 0.3s ease;
    opacity: 0; transform: translateY(-10px);
}
.sc-streetview-panel.show {
    opacity: 1; transform: translateY(0);
}
.sc-streetview-panel.hidden {
    display: none;
}
.streetview-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}
.streetview-title {
    font-size: 13px; font-weight: 600; color: var(--text-primary);
}
.btn-close-sv {
    width: 28px; height: 28px; border-radius: 6px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-secondary); font-size: 14px;
    cursor: pointer; transition: var(--transition);
    display: flex; align-items: center; justify-content: center;
}
.btn-close-sv:hover {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-primary);
}
.streetview-iframe {
    width: 100%; height: 280px; border: none; display: block;
}

/* Context panel */
.sc-context-panel {
    position: absolute; bottom: 20px; left: 20px; right: 20px;
    max-width: 500px; padding: 24px;
    background: rgba(15,23,42,0.88); backdrop-filter: blur(16px);
    border-radius: var(--radius); border: 1px solid var(--border);
    box-shadow: var(--shadow);
    animation: slideUp 0.5s ease forwards;
}
.sc-context-panel.hidden { display: none; }
.context-badge {
    display: inline-block; padding: 5px 12px; border-radius: 8px;
    color: white; font-size: 12px; font-weight: 700; margin-bottom: 10px;
}
.context-title { font-size: 20px; font-weight: 800; margin-bottom: 4px; }
.context-subtitle { color: var(--text-secondary); font-size: 14px; margin-bottom: 12px; }
.context-divider { height: 1px; background: var(--border); margin: 12px 0; }
.context-label { font-size: 12px; font-weight: 700; color: var(--accent-blue); text-transform: uppercase; margin-bottom: 6px; }
.context-text { font-size: 14px; line-height: 1.7; color: var(--text-secondary); }
.btn-start-choose {
    display: flex; align-items: center; justify-content: center; gap: 8px;
    width: 100%; padding: 14px; margin-top: 16px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    border: none; border-radius: var(--radius-sm);
    color: white; font-family: var(--font); font-size: 15px; font-weight: 700;
    cursor: pointer; transition: var(--transition);
}
.btn-start-choose:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(14,165,233,0.4); }
.btn-arrow { transition: transform 0.3s; }
.btn-start-choose:hover .btn-arrow { transform: translateX(4px); }

/* Choice panel */
.sc-choice-panel {
    position: absolute; bottom: 20px; left: 20px; right: 20px;
    max-width: 500px; padding: 20px;
    background: rgba(15,23,42,0.88); backdrop-filter: blur(16px);
    border-radius: var(--radius); border: 1px solid var(--border);
}
.sc-choice-panel.hidden { display: none; }
.sc-choice-panel.slide-in { animation: slideUp 0.4s ease; }
.choice-header { margin-bottom: 12px; }
.choice-question { font-size: 16px; font-weight: 800; }
.choice-list { display: flex; flex-direction: column; gap: 8px; }
.choice-btn {
    display: flex; align-items: center; gap: 10px;
    width: 100%; padding: 12px 14px; text-align: left;
    background: rgba(255,255,255,0.05); border: 1px solid var(--border);
    border-radius: var(--radius-sm); color: var(--text-primary);
    font-family: var(--font); font-size: 14px;
    cursor: pointer; transition: all 0.25s ease;
}
.choice-btn:hover:not(:disabled) { background: rgba(14,165,233,0.15); border-color: var(--accent-blue); transform: translateX(4px); }
.choice-btn:disabled { opacity: 0.5; cursor: default; }
.choice-btn.selected { background: rgba(14,165,233,0.25); border-color: var(--accent-blue); }
.choice-key {
    display: flex; align-items: center; justify-content: center;
    width: 30px; height: 30px; border-radius: 8px;
    background: rgba(255,255,255,0.1); font-weight: 800; font-size: 14px;
    flex-shrink: 0;
}
.choice-icon { font-size: 18px; flex-shrink: 0; }
.choice-text { flex: 1; line-height: 1.4; }

/* Result overlay */
.sc-result-overlay {
    position: absolute; inset: 0;
    background: rgba(0,0,0,0.54); backdrop-filter: blur(5px);
    display: flex; align-items: center; justify-content: center;
    padding: 20px; opacity: 0; transition: opacity 0.4s ease;
}
.sc-result-overlay.hidden { display: none; }
.sc-result-overlay.show { opacity: 1; }
.result-card {
    max-width: 760px; width: 100%; max-height: calc(100vh - 40px);
    overflow-y: auto; padding: 24px;
    background: rgba(30,41,59,0.95); backdrop-filter: blur(16px);
    border-radius: var(--radius); border: 2px solid var(--border);
    box-shadow: var(--shadow);
    animation: scaleIn 0.4s ease;
}
.result-topline { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
.result-severity {
    display: inline-block; padding: 5px 14px; border-radius: 8px;
    color: white; font-size: 12px; font-weight: 800;
    text-transform: uppercase; letter-spacing: 0.5px;
}
.result-choice {
    padding: 5px 12px; border-radius: 8px;
    background: rgba(255,255,255,0.08);
    border: 1px solid var(--border);
    color: var(--text-secondary); font-size: 12px; font-weight: 700;
}
.result-title { font-size: 22px; font-weight: 900; margin-bottom: 10px; line-height: 1.3; }
.result-desc { font-size: 14px; line-height: 1.7; color: var(--text-secondary); }
.result-choice-text {
    margin-top: 10px;
    padding: 10px 12px;
    border-radius: 8px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-primary);
    font-size: 13px;
    line-height: 1.5;
    font-weight: 700;
}
.result-feedback {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-top: 14px;
}
.result-feedback.hidden { display: none; }
.feedback-section {
    padding: 12px;
    border-radius: 10px;
    background: rgba(15,23,42,0.7);
    border: 1px solid rgba(255,255,255,0.12);
}
.feedback-section-metrics { grid-row: span 2; }
.feedback-message {
    background: rgba(14,165,233,0.11);
    border-color: rgba(14,165,233,0.26);
}
.feedback-label {
    margin-bottom: 7px;
    color: var(--accent-cyan);
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
}
.feedback-section p,
.feedback-metrics {
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.55;
}
.feedback-metrics {
    list-style: none;
    display: grid;
    gap: 7px;
}
.feedback-metrics li {
    position: relative;
    padding-left: 15px;
}
.feedback-metrics li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.7em;
    width: 6px;
    height: 6px;
    border-radius: 999px;
    background: var(--accent-blue);
}
.result-insight-grid {
    display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px; margin-top: 16px;
}
.result-insight {
    padding: 12px; border-radius: 10px;
    background: rgba(255,255,255,0.055);
    border: 1px solid var(--border);
}
.result-insight-label {
    margin-bottom: 6px;
    color: var(--accent-cyan);
    font-size: 11px; font-weight: 800;
    text-transform: uppercase;
}
.result-insight p {
    color: var(--text-secondary);
    font-size: 13px; line-height: 1.55;
}
.result-lesson-box { margin-top: 12px; }
.result-lesson-label {
    font-size: 13px; font-weight: 700; color: var(--accent-blue);
    text-transform: uppercase; margin-bottom: 8px;
}
.result-lesson {
    font-size: 14px; line-height: 1.7; color: var(--text-secondary);
    padding: 12px; background: rgba(14,165,233,0.08);
    border-radius: 8px; border-left: 3px solid var(--accent-blue);
    white-space: pre-line;
}
.result-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.btn-next, .btn-retry, .btn-replay, .btn-home {
    flex: 1; min-width: 120px; padding: 12px 16px;
    border: none; border-radius: var(--radius-sm);
    font-family: var(--font); font-size: 13px; font-weight: 700;
    cursor: pointer; transition: var(--transition);
}
.btn-next {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
}
.btn-next:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(14,165,233,0.4); }
.btn-retry { background: rgba(255,255,255,0.08); color: var(--text-primary); border: 1px solid var(--border); }
.btn-retry:hover { background: rgba(255,255,255,0.15); }
.btn-replay {
    background: rgba(59,130,246,0.14);
    color: #bfdbfe;
    border: 1px solid rgba(59,130,246,0.35);
}
.btn-replay:hover { background: rgba(59,130,246,0.22); }
.btn-home { background: rgba(255,255,255,0.05); color: var(--text-muted); border: 1px solid var(--border); }
.btn-home:hover { color: var(--text-primary); background: rgba(255,255,255,0.1); }

/* ============================================================
   SUMMARY VIEW
   ============================================================ */
#view-summary { overflow-y: auto; }
.summary-wrapper { max-width: 700px; margin: 0 auto; padding: 30px 20px 60px; }
.summary-header { display: flex; align-items: center; gap: 16px; margin-bottom: 30px; }
.summary-title { font-size: 24px; font-weight: 900; }

/* Score circle */
.summary-score-card {
    display: flex; align-items: center; gap: 24px;
    padding: 24px; margin-bottom: 24px;
    background: var(--bg-glass); border-radius: var(--radius);
    border: 1px solid var(--border);
}
.score-circle {
    position: relative; width: 120px; height: 120px; flex-shrink: 0;
}
.score-circle svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.score-bg { fill: none; stroke: rgba(255,255,255,0.1); stroke-width: 8; }
.score-fill {
    fill: none; stroke: var(--accent-blue); stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 1.5s ease;
}
.score-circle.animated .score-fill { stroke-dashoffset: attr(stroke-dashoffset) !important; }
.grade-excellent .score-fill { stroke: var(--success); }
.grade-good .score-fill { stroke: var(--accent-blue); }
.grade-medium .score-fill { stroke: var(--warning); }
.grade-low .score-fill { stroke: var(--danger); }
.score-value {
    position: absolute; inset: 0; display: flex; align-items: center;
    justify-content: center; font-size: 28px; font-weight: 900;
}
.score-info { flex: 1; }
.score-grade { font-size: 22px; font-weight: 800; margin-bottom: 4px; }
.score-detail { font-size: 14px; color: var(--text-muted); }

/* Summary grid */
.summary-grid { display: flex; flex-direction: column; gap: 8px; margin-bottom: 24px; }
.summary-item {
    display: flex; align-items: center; gap: 12px;
    padding: 14px 16px; border-radius: var(--radius-sm);
    background: var(--bg-card); border: 1px solid var(--border);
    border-left: 3px solid var(--item-color, var(--text-muted));
}
.si-num { font-size: 18px; font-weight: 900; color: var(--text-muted); width: 28px; text-align: center; }
.si-content { flex: 1; }
.si-title { font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.si-result { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.si-choice { font-size: 12px; color: var(--text-muted); font-weight: 600; }
.si-severity {
    padding: 2px 8px; border-radius: 4px;
    color: white; font-size: 10px; font-weight: 700; text-transform: uppercase;
}
.si-correct { font-size: 12px; font-weight: 700; color: var(--success); }
.si-correct:not(:empty):first-letter { }
.si-pending { font-size: 12px; color: var(--text-muted); font-style: italic; }

/* Lesson box */
.summary-lesson-box {
    padding: 20px; border-radius: var(--radius);
    background: rgba(14,165,233,0.08); border: 1px solid rgba(14,165,233,0.2);
    margin-bottom: 24px;
}
.summary-lesson-box h3 { font-size: 16px; font-weight: 800; margin-bottom: 12px; }
.lesson-list { list-style: none; }
.lesson-list li {
    padding: 8px 0 8px 20px; position: relative;
    font-size: 14px; line-height: 1.6; color: var(--text-secondary);
}
.lesson-list li::before {
    content: '✦'; position: absolute; left: 0; color: var(--accent-blue);
}

/* Summary actions */
.summary-actions { display: flex; gap: 10px; }
.btn-primary, .btn-secondary {
    flex: 1; padding: 14px; border: none; border-radius: var(--radius-sm);
    font-family: var(--font); font-size: 14px; font-weight: 700;
    cursor: pointer; transition: var(--transition);
}
.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple)); color: white;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(14,165,233,0.4); }
.btn-secondary { background: var(--bg-glass); color: var(--text-primary); border: 1px solid var(--border); }
.btn-secondary:hover { background: rgba(255,255,255,0.12); }

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 640px) {
    .landing-overlay { padding: 20px 14px 40px; }
    .scenario-grid { grid-template-columns: 1fr; }
    .hero-meta { flex-direction: column; align-items: center; }
    .sc-signal-strip { top: 58px; left: 10px; right: 10px; }
    .scene-chip { font-size: 11px; padding: 6px 8px; }
    .sc-context-panel, .sc-choice-panel { left: 10px; right: 10px; bottom: 10px; padding: 18px; }
    .result-card { padding: 20px; }
    .result-feedback { grid-template-columns: 1fr; }
    .feedback-section-metrics { grid-row: auto; }
    .result-insight-grid { grid-template-columns: 1fr; }
    .result-actions { flex-direction: column; }
    .summary-score-card { flex-direction: column; text-align: center; }
    .summary-actions { flex-direction: column; }
    .sc-streetview-toggle { top: 58px; right: 10px; }
    .sc-streetview-panel { top: 92px; right: 10px; width: calc(100% - 20px); }
    .streetview-iframe { height: 220px; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ============================================================
   LIBRARY PAGE
   ============================================================ */
.library-page {
    min-height: 100vh; padding: 20px;
    background: linear-gradient(180deg, var(--bg-primary) 0%, #0c1222 100%);
    overflow-y: auto;
}
.library-header {
    display: flex; align-items: center; gap: 16px;
    margin-bottom: 24px;
}
.library-title-group { flex: 1; }
.library-title {
    font-size: 24px; font-weight: 800; color: var(--text-primary);
    margin-bottom: 4px;
}
.library-subtitle {
    font-size: 14px; color: var(--text-secondary);
}
.btn-library {
    display: inline-block; margin-top: 16px;
    padding: 12px 24px; border-radius: 10px;
    background: linear-gradient(135deg, #8b5cf6, #6d28d9);
    color: #fff; font-size: 14px; font-weight: 700;
    border: none; cursor: pointer; transition: var(--transition);
}
.btn-library:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

/* Tabs */
.library-tabs {
    display: flex; gap: 8px; margin-bottom: 24px;
    border-bottom: 1px solid var(--border); padding-bottom: 12px;
}
.lib-tab {
    padding: 10px 18px; border-radius: 8px;
    border: 1px solid var(--border);
    background: transparent; color: var(--text-secondary);
    font-size: 14px; font-weight: 600; cursor: pointer;
    transition: var(--transition);
}
.lib-tab.active {
    background: rgba(14, 165, 233, 0.15);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}
.lib-tab:hover:not(.active) {
    background: rgba(255,255,255,0.05);
}

/* Filter */
.lib-filter {
    display: flex; gap: 8px; margin-bottom: 20px; flex-wrap: wrap;
}
.filter-btn {
    padding: 6px 14px; border-radius: 20px;
    border: 1px solid var(--border);
    background: transparent; color: var(--text-secondary);
    font-size: 12px; font-weight: 600; cursor: pointer;
    transition: var(--transition);
}
.filter-btn.active {
    background: rgba(14, 165, 233, 0.15);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.lib-empty {
    text-align: center; padding: 60px 20px;
    color: var(--text-muted); font-size: 16px;
}

/* ─── VIDEO GRID ─── */
.video-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}
.video-card {
    background: var(--bg-card); border-radius: var(--radius);
    border: 1px solid var(--border); overflow: hidden;
    transition: var(--transition);
}
.video-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}
.video-thumb {
    position: relative; cursor: pointer;
    aspect-ratio: 16/9; overflow: hidden;
}
.video-thumb img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 0.3s;
}
.video-thumb:hover img { transform: scale(1.05); }
.video-play {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: 48px; color: #fff;
    background: rgba(0,0,0,0.3);
    opacity: 0; transition: opacity 0.3s;
}
.video-thumb:hover .video-play { opacity: 1; }
.video-duration {
    position: absolute; bottom: 8px; right: 8px;
    padding: 2px 8px; border-radius: 4px;
    background: rgba(0,0,0,0.8); color: #fff;
    font-size: 11px; font-weight: 600;
}
.video-info { padding: 16px; }
.video-title { font-size: 15px; font-weight: 700; margin-bottom: 6px; color: var(--text-primary); }
.video-desc { font-size: 13px; color: var(--text-secondary); margin-bottom: 10px; line-height: 1.5; }
.video-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tag {
    padding: 3px 8px; border-radius: 4px;
    background: rgba(14, 165, 233, 0.1); color: var(--accent-blue);
    font-size: 11px; font-weight: 600;
}

/* Video Modal */
.video-player-modal {
    position: fixed; inset: 0; z-index: 1000;
    display: flex; align-items: center; justify-content: center;
}
.video-player-modal.hidden { display: none; }
.video-modal-backdrop {
    position: absolute; inset: 0;
    background: rgba(0,0,0,0.85);
}
.video-modal-content {
    position: relative; width: 90%; max-width: 800px;
    border-radius: var(--radius); overflow: hidden;
    background: #000;
}
.btn-close-modal {
    position: absolute; top: 10px; right: 10px; z-index: 10;
    width: 36px; height: 36px; border-radius: 50%;
    background: rgba(255,255,255,0.15); border: none;
    color: #fff; font-size: 18px; cursor: pointer;
}
.video-iframe-wrap { aspect-ratio: 16/9; }
.video-iframe-wrap iframe { width: 100%; height: 100%; border: none; }

/* ─── REGULATIONS ─── */
.reg-list { display: flex; flex-direction: column; gap: 16px; }
.reg-card {
    display: flex; gap: 16px; padding: 20px;
    background: var(--bg-card); border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}
.reg-card:hover { border-color: var(--accent-purple); }
.reg-icon { font-size: 32px; flex-shrink: 0; }
.reg-body { flex: 1; }
.reg-title { font-size: 16px; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.reg-desc { font-size: 13px; color: var(--text-secondary); margin-bottom: 10px; line-height: 1.5; }
.reg-meta {
    display: flex; gap: 16px; margin-bottom: 10px;
    font-size: 12px; color: var(--text-muted);
}
.reg-highlights { margin-bottom: 10px; }
.reg-hl-label { font-size: 12px; font-weight: 700; color: var(--accent-cyan); margin-bottom: 4px; }
.reg-highlights ul { padding-left: 18px; }
.reg-highlights li { font-size: 13px; color: var(--text-secondary); margin-bottom: 3px; }
.reg-link {
    display: inline-block; padding: 6px 12px; border-radius: 6px;
    background: rgba(139, 92, 246, 0.12); color: var(--accent-purple);
    font-size: 12px; font-weight: 600; text-decoration: none;
    transition: var(--transition);
}
.reg-link:hover { background: rgba(139, 92, 246, 0.25); }

/* ─── QUIZZES ─── */
.quiz-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}
.quiz-card {
    padding: 24px; background: var(--bg-card);
    border-radius: var(--radius); border: 1px solid var(--border);
    transition: var(--transition);
}
.quiz-card:hover { border-color: var(--warning); }
.quiz-card-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 12px;
}
.quiz-diff { font-size: 12px; font-weight: 700; }
.quiz-count { font-size: 12px; color: var(--text-muted); }
.quiz-title { font-size: 16px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.quiz-desc { font-size: 13px; color: var(--text-secondary); margin-bottom: 16px; line-height: 1.5; }
.btn-start-quiz {
    width: 100%; padding: 10px; border-radius: 8px;
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #fff; font-size: 13px; font-weight: 700;
    border: none; cursor: pointer; transition: var(--transition);
}
.btn-start-quiz:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3); }

/* Quiz Play */
.quiz-play { max-width: 800px; margin: 0 auto; }
.quiz-play-header {
    display: flex; align-items: center; gap: 16px;
    margin-bottom: 24px; flex-wrap: wrap;
}
.btn-back-quiz {
    padding: 8px 14px; border-radius: 8px;
    border: 1px solid var(--border);
    background: rgba(255,255,255,0.08); color: var(--text-primary);
    font-size: 13px; cursor: pointer; transition: var(--transition);
}
.btn-back-quiz:hover { background: rgba(255,255,255,0.15); }
.quiz-play-title { flex: 1; font-size: 18px; font-weight: 700; }
.quiz-progress {
    padding: 4px 12px; border-radius: 20px;
    background: rgba(14, 165, 233, 0.15); color: var(--accent-blue);
    font-size: 13px; font-weight: 700;
}

.quiz-questions { display: flex; flex-direction: column; gap: 20px; }
.quiz-question {
    padding: 20px; background: var(--bg-card);
    border-radius: var(--radius); border: 1px solid var(--border);
    transition: border-color 0.3s;
}
.quiz-question.correct { border-color: var(--success); }
.quiz-question.wrong { border-color: var(--danger); }
.qq-header { display: flex; justify-content: space-between; margin-bottom: 10px; }
.qq-num { font-size: 12px; font-weight: 700; color: var(--accent-blue); }
.qq-status { font-size: 12px; font-weight: 700; }
.quiz-question.correct .qq-status { color: var(--success); }
.quiz-question.wrong .qq-status { color: var(--danger); }
.qq-text { font-size: 15px; font-weight: 600; color: var(--text-primary); margin-bottom: 14px; line-height: 1.5; }
.qq-options { display: flex; flex-direction: column; gap: 8px; }
.qq-option {
    padding: 12px 16px; border-radius: 8px;
    border: 1px solid var(--border);
    background: rgba(255,255,255,0.04); color: var(--text-primary);
    font-size: 14px; text-align: left; cursor: pointer;
    transition: var(--transition);
}
.qq-option:hover:not([disabled]) {
    background: rgba(14, 165, 233, 0.1);
    border-color: var(--accent-blue);
}
.qq-option.correct-answer {
    background: rgba(16, 185, 129, 0.15);
    border-color: var(--success); color: var(--success);
}
.qq-option.wrong-answer {
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--danger); color: var(--danger);
}
.qq-explanation {
    margin-top: 12px; padding: 10px 14px; border-radius: 8px;
    background: rgba(6, 182, 212, 0.08); border: 1px solid rgba(6, 182, 212, 0.2);
    font-size: 13px; color: var(--accent-cyan); line-height: 1.5;
}

.quiz-result-summary {
    margin-top: 24px; padding: 20px; border-radius: var(--radius);
    background: rgba(16, 185, 129, 0.08); border: 1px solid rgba(16, 185, 129, 0.3);
    display: flex; align-items: center; justify-content: space-between;
}
.quiz-score { font-size: 18px; color: var(--success); }
.btn-retry-quiz {
    padding: 10px 20px; border-radius: 8px;
    background: rgba(255,255,255,0.1); border: 1px solid var(--border);
    color: var(--text-primary); font-size: 13px; font-weight: 600;
    cursor: pointer; transition: var(--transition);
}
.btn-retry-quiz:hover { background: rgba(255,255,255,0.15); }

/* ─── LIBRARY RESPONSIVE ─── */
@media (max-width: 640px) {
    .library-header { flex-direction: column; align-items: flex-start; }
    .library-title { font-size: 20px; }
    .library-tabs { overflow-x: auto; flex-wrap: nowrap; }
    .video-grid { grid-template-columns: 1fr; }
    .quiz-grid { grid-template-columns: 1fr; }
    .reg-card { flex-direction: column; gap: 10px; }
    .quiz-result-summary { flex-direction: column; gap: 12px; text-align: center; }
}