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

/* Accessibility: skip link */
.skip-link {
    position: absolute;
    left: 16px;
    top: -60px;
    background: var(--primary-blue);
    color: #ffffff;
    padding: 10px 18px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.9rem;
    text-decoration: none;
    z-index: 3000;
    transition: top 0.15s ease;
}

.skip-link:focus {
    top: 12px;
    color: #ffffff;
}

/* Accessibility: visible keyboard focus indicator */
:focus-visible {
    outline: 3px solid var(--primary-blue);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Accessibility: screen-reader-only text */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Accessibility: respect reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:root {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #ffffff;
    --bg-input: #ffffff;
    
    --primary-blue: #2563eb;
    --primary-cyan: #0284c7;
    --accent-emerald: #059669;
    --accent-purple: #7c3aed;
    --accent-orange: #ea580c;
    --accent-rose: #e11d48;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b; /* darkened from #94a3b8 for 4.76:1 contrast on white (WCAG AA) */
    
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    
    --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
    --glow-shadow: 0 20px 35px -10px rgba(37, 99, 235, 0.12);
    
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(circle at 10% 10%, rgba(56, 189, 248, 0.08) 0%, transparent 45%),
        radial-gradient(circle at 90% 90%, rgba(124, 58, 237, 0.06) 0%, transparent 45%),
        radial-gradient(circle at 50% 50%, rgba(16, 185, 129, 0.05) 0%, transparent 60%);
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    padding: 30px 20px 60px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1350px;
    margin: 0 auto;
}

/* Header Styles */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 30px 20px 10px;
    position: relative;
}

.header-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(37, 99, 235, 0.08);
    border: 1px solid rgba(37, 99, 235, 0.2);
    color: var(--primary-blue);
    padding: 6px 16px;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.live-dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent-emerald);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent-emerald);
    animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
    0% { transform: scale(0.95); opacity: 0.8; }
    50% { transform: scale(1.3); opacity: 1; }
    100% { transform: scale(0.95); opacity: 0.8; }
}

header h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, var(--primary-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 12px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto;
    font-weight: 400;
}

/* Featured Hero Banner */
.featured-hero-container {
    margin-bottom: 40px;
    background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 24px 30px;
    box-shadow: var(--card-shadow), var(--glow-shadow);
}

.hero-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.hero-title-badge {
    font-size: 0.8rem;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--primary-blue);
    letter-spacing: 0.8px;
}

.randomize-btn {
    background: #ffffff;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 700;
    font-family: var(--font-sans);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
    transition: all 0.2s ease;
}

.randomize-btn:hover {
    background: var(--primary-blue);
    color: #ffffff;
    border-color: var(--primary-blue);
    transform: rotate(-1deg) scale(1.02);
}

.hero-card {
    display: block;
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s ease;
}

.hero-card:hover {
    transform: translateY(-2px);
}

.hero-badge-row {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.tag-badge.outline {
    background: transparent;
    border-color: #cbd5e1;
    color: var(--text-muted);
}

.hero-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
    margin-bottom: 16px;
}

.hero-text h2 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.hero-text p {
    font-size: 1rem;
    color: var(--text-secondary);
}

.hero-progress-group {
    min-width: 280px;
    text-align: right;
}

.hero-percentage {
    font-family: var(--font-mono);
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary-blue);
    margin-bottom: 6px;
}

.hero-progress-bar {
    width: 100%;
    height: 16px;
    background: #e2e8f0;
    border-radius: 30px;
    overflow: hidden;
}

.hero-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-blue), var(--primary-cyan));
    border-radius: 30px;
    transition: width 1.2s cubic-bezier(0.25, 1, 0.5, 1);
}

.hero-footer {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-blue);
    border-top: 1px dashed var(--border-color);
    padding-top: 12px;
}

/* Filter & Search Bar */
.controls-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    margin-bottom: 40px;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
    padding: 14px 20px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.03);
}

.filter-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 18px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-sans);
}

.filter-btn:hover {
    color: var(--text-primary);
    border-color: #cbd5e1;
    background: #f1f5f9;
}

.filter-btn.active {
    background: var(--primary-blue);
    color: #ffffff;
    border-color: var(--primary-blue);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    font-weight: 700;
}

.filter-btn.action-btn {
    border-color: #cbd5e1;
    background: #ffffff;
    color: var(--text-primary);
}

.filter-btn.action-btn:hover {
    background: var(--accent-purple);
    color: #ffffff;
    border-color: var(--accent-purple);
}

.controls-right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.quiz-toggle-btn {
    background: linear-gradient(135deg, #f5f3ff, #ede9fe);
    border: 1px solid #c4b5fd;
    color: var(--accent-purple);
    padding: 8px 16px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: var(--font-sans);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.quiz-toggle-btn:hover {
    background: var(--accent-purple);
    color: #ffffff;
    border-color: var(--accent-purple);
    box-shadow: 0 4px 12px rgba(124, 58, 237, 0.25);
    transform: translateY(-1px);
}

.quiz-toggle-btn.active {
    background: var(--accent-purple);
    color: #ffffff;
    border-color: var(--accent-purple);
    box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
}

.live-dot-sm {
    display: inline-block;
    width: 6px;
    height: 6px;
    background-color: var(--accent-emerald);
    border-radius: 50%;
    margin-right: 4px;
    box-shadow: 0 0 6px var(--accent-emerald);
    animation: pulseDot 1.5s infinite;
}

/* Quiz Controls inside Cards */
.quiz-box {
    margin-top: 14px;
    padding: 12px;
    background: #f8fafc;
    border: 1px dashed #cbd5e1;
    border-radius: 12px;
    display: none;
}

body.quiz-mode-on .quiz-box {
    display: block;
}

body.quiz-mode-on .stat-card:not([data-category="realtime"]) .percentage {
    opacity: 0.15;
    filter: blur(4px);
    transition: all 0.3s ease;
}

body.quiz-mode-on .stat-card.revealed .percentage {
    opacity: 1;
    filter: none;
}

.quiz-slider-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.quiz-slider {
    flex: 1;
    height: 6px;
    border-radius: 4px;
    background: #e2e8f0;
    outline: none;
    accent-color: var(--accent-purple);
    cursor: pointer;
}

.quiz-val-display {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.95rem;
    min-width: 45px;
    color: var(--accent-purple);
}

.quiz-btn-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.check-guess-btn {
    background: var(--accent-purple);
    color: #ffffff;
    border: none;
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.check-guess-btn:hover {
    background: #6d28d9;
}

.guess-feedback {
    font-size: 0.8rem;
    font-weight: 700;
    font-family: var(--font-mono);
}

.guess-feedback.accurate { color: var(--accent-emerald); }
.guess-feedback.off { color: #ea580c; }

.search-input {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 10px 16px 10px 40px;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: var(--font-sans);
    outline: none;
    transition: all 0.2s ease;
}

.search-input:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Category Sections */
.category-section {
    margin-bottom: 50px;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-color);
}

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

.category-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 24px;
}

/* Card Styling */
.stat-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 24px;
    box-shadow: var(--card-shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-blue), var(--primary-cyan));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: #cbd5e1;
    box-shadow: var(--card-shadow), var(--glow-shadow);
}

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

.card-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.tag-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: #f1f5f9;
    color: var(--text-secondary);
    border: 1px solid #e2e8f0;
}

.tag-badge.cyan { color: var(--primary-cyan); background: rgba(2, 132, 199, 0.08); border-color: rgba(2, 132, 199, 0.2); }
.tag-badge.emerald { color: var(--accent-emerald); background: rgba(5, 150, 105, 0.08); border-color: rgba(5, 150, 105, 0.2); }
.tag-badge.purple { color: var(--accent-purple); background: rgba(124, 58, 237, 0.08); border-color: rgba(124, 58, 237, 0.2); }
.tag-badge.orange { color: var(--accent-orange); background: rgba(234, 88, 12, 0.08); border-color: rgba(234, 88, 12, 0.2); }

.share-btn {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all 0.2s ease;
}

.share-btn:hover {
    background: var(--primary-blue);
    color: #ffffff;
    border-color: var(--primary-blue);
}

.stat-header h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
    line-height: 1.3;
}

.description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 22px;
    min-height: 42px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Progress Container */
.progress-container {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 18px;
}

.progress-bar {
    flex: 1;
    height: 14px;
    background: #f1f5f9;
    border-radius: 30px;
    overflow: hidden;
    position: relative;
    border: 1px solid #e2e8f0;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
}

.progress-fill {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--primary-blue), var(--primary-cyan));
    border-radius: 30px;
    width: 0%;
    transition: width 1.8s cubic-bezier(0.25, 1, 0.5, 1);
    position: relative;
}

/* Custom color fills based on dataset */
.stat-card[data-color="emerald"] .progress-fill {
    background: linear-gradient(90deg, #059669, #10b981);
}

.stat-card[data-color="purple"] .progress-fill {
    background: linear-gradient(90deg, #7c3aed, #a855f7);
}

.stat-card[data-color="orange"] .progress-fill {
    background: linear-gradient(90deg, #ea580c, #f97316);
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.45),
        transparent
    );
    animation: shimmer 2.2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.percentage {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--primary-blue);
    min-width: 65px;
    text-align: right;
    letter-spacing: -0.5px;
}

.stat-card[data-color="emerald"] .percentage { color: var(--accent-emerald); }
.stat-card[data-color="purple"] .percentage { color: var(--accent-purple); }
.stat-card[data-color="orange"] .percentage { color: var(--accent-orange); }

/* Card Footer */
.stat-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
}

.trend {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--accent-emerald);
    font-weight: 600;
}

.view-link {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s ease, transform 0.2s ease;
}

.stat-card:hover .view-link {
    color: var(--primary-blue);
    transform: translateX(3px);
}

/* Modal Overlay & Card */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

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

.modal-card {
    background: #ffffff;
    border-radius: 20px;
    width: 100%;
    max-width: 520px;
    padding: 28px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    position: relative;
    animation: modalPop 0.25s ease-out forwards;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h3 {
    font-size: 1.4rem;
    font-weight: 700;
}

.close-btn {
    background: #f1f5f9;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 1rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.stat-quote-box {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    padding: 16px;
    border-radius: 12px;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 24px;
    line-height: 1.5;
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
    transition: transform 0.15s ease, opacity 0.15s ease;
    border: none;
}

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

.primary-btn { background: var(--primary-blue); color: #ffffff; }
.twitter-btn { background: #000000; color: #ffffff; }
.reddit-btn { background: #ff4500; color: #ffffff; }
.secondary-btn { background: #e2e8f0; color: var(--text-primary); font-size: 0.85rem; padding: 8px 14px; margin-top: 8px; }

.embed-section {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

.embed-section label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.embed-input {
    width: 100%;
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background: #f8fafc;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #0f172a;
    color: #ffffff;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2000;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Footer */
footer {
    text-align: center;
    padding: 50px 20px 20px;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
}

footer p {
    margin-bottom: 10px;
}

.note {
    font-size: 0.8rem;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    header h1 { font-size: 2.4rem; }
    .hero-content { flex-direction: column; align-items: flex-start; gap: 16px; }
    .hero-progress-group { width: 100%; min-width: auto; text-align: left; }
    .controls-bar { flex-direction: column; align-items: stretch; }
    .search-box { min-width: 100%; }
    .stats-grid { grid-template-columns: 1fr; }
}