/* =============================================================================
   NFL Officiating Observatory - Main Styles v2
   With carousel, tooltips, and explainer modals
   ============================================================================= */

/* -----------------------------------------------------------------------------
   CSS Variables
   ----------------------------------------------------------------------------- */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: rgba(20, 20, 30, 0.7);
    --bg-glass: rgba(255, 255, 255, 0.03);
    
    --text-primary: #f0f0f5;
    --text-secondary: rgba(255, 255, 255, 0.6);
    --text-muted: rgba(255, 255, 255, 0.4);
    
    --accent-cyan: #00f0ff;
    --accent-purple: #a855f7;
    --accent-orange: #ff6b35;
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --accent-yellow: #fbbf24;
    --accent-gold: #FFD700;
    
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(0, 240, 255, 0.3);
    
    --font-display: 'Space Grotesk', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    --section-padding: clamp(3rem, 8vw, 6rem);
    --card-padding: 1.5rem;
    --gap-sm: 0.75rem;
    --gap-md: 1.5rem;
    --gap-lg: 2.5rem;
    
    --blur-glass: 12px;
    --shadow-glow: 0 0 40px rgba(0, 240, 255, 0.15);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: -1;
}

a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover { color: var(--accent-purple); }

/* -----------------------------------------------------------------------------
   Typography
   ----------------------------------------------------------------------------- */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

/* -----------------------------------------------------------------------------
   Layout
   ----------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 clamp(1rem, 4vw, 2rem);
}

section {
    padding: var(--section-padding) 0;
}

/* -----------------------------------------------------------------------------
   Navigation
   ----------------------------------------------------------------------------- */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 2rem;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(var(--blur-glass));
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-links a:hover { color: var(--accent-cyan); }

/* -----------------------------------------------------------------------------
   Hero Section
   ----------------------------------------------------------------------------- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 6rem 2rem 4rem;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--accent-cyan);
    margin-bottom: 1.5rem;
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.hero h1 {
    margin-bottom: 1rem;
    max-width: 900px;
}

.hero h1 span {
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-orange));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 700px;
    margin-bottom: 3rem;
}

.hero-disclaimer {
    margin-top: 2rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--gap-md);
    width: 100%;
    max-width: 900px;
}

.stat-card {
    background: var(--bg-card);
    backdrop-filter: blur(var(--blur-glass));
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: var(--card-padding);
    transition: all var(--transition-base);
}

.stat-card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}

.stat-value {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

/* -----------------------------------------------------------------------------
   Crew Chief Explainer Banner
   ----------------------------------------------------------------------------- */
.explainer-banner {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.1), rgba(0, 240, 255, 0.1));
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
    padding: 1.5rem 0;
}

.explainer-banner.hidden {
    display: none;
}

.explainer-content {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
}

.explainer-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.explainer-text h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--accent-cyan);
}

.explainer-text p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.explainer-text em {
    color: var(--text-primary);
    font-style: italic;
}

.explainer-text strong {
    color: var(--accent-cyan);
}

.explainer-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    margin-left: auto;
    transition: color var(--transition-base);
}

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

/* -----------------------------------------------------------------------------
   Info Triggers (? buttons)
   ----------------------------------------------------------------------------- */
.info-trigger {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 100px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-base);
}

.info-trigger:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

.info-trigger-inline {
    background: none;
    border: none;
    color: var(--accent-cyan);
    font-size: inherit;
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.info-trigger-small,
.th-info {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    color: var(--text-muted);
    width: 20px;
    height: 20px;
    border-radius: 50%;
    font-size: 0.7rem;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-left: 0.5rem;
    vertical-align: middle;
}

.info-trigger-small:hover,
.th-info:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

/* -----------------------------------------------------------------------------
   Section Headers
   ----------------------------------------------------------------------------- */
.section-header {
    text-align: center;
    margin-bottom: var(--gap-lg);
}

.section-number {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-cyan);
    letter-spacing: 0.1em;
    margin-bottom: 0.75rem;
}

.section-title {
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* -----------------------------------------------------------------------------
   Carousel
   ----------------------------------------------------------------------------- */
.carousel-container {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 3rem;
}

.carousel-track {
    display: flex;
    gap: 1.5rem;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding: 1rem 0;
}

.carousel-track::-webkit-scrollbar {
    display: none;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-base);
    z-index: 10;
}

.carousel-btn:hover {
    background: var(--accent-cyan);
    color: var(--bg-primary);
    border-color: var(--accent-cyan);
}

.carousel-prev { left: 0; }
.carousel-next { right: 0; }

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border-subtle);
    cursor: pointer;
    transition: all var(--transition-base);
}

.carousel-dot.active {
    background: var(--accent-cyan);
    transform: scale(1.3);
}

/* Insight Cards (in carousel) */
.insight-card {
    flex: 0 0 350px;
    scroll-snap-align: start;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
}

.insight-card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

.insight-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
}

.insight-card.positive::before {
    background: linear-gradient(90deg, var(--accent-green), var(--accent-cyan));
}

.insight-card.negative::before {
    background: linear-gradient(90deg, var(--accent-red), var(--accent-orange));
}

.insight-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.insight-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.insight-value {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    line-height: 1;
}

.insight-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.insight-explainer {
    background: var(--bg-glass);
    border-radius: 12px;
    padding: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-left: 3px solid var(--accent-purple);
}

.insight-explainer strong {
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.25rem;
}

/* -----------------------------------------------------------------------------
   Referee Cards
   ----------------------------------------------------------------------------- */
.referee-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--gap-md);
}

.referee-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: var(--card-padding);
    cursor: pointer;
    transition: all var(--transition-base);
}

.referee-card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}

.referee-name {
    font-family: var(--font-display);
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.referee-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.referee-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.referee-stat {
    text-align: center;
    padding: 0.75rem 0.5rem;
    background: var(--bg-glass);
    border-radius: 8px;
}

.referee-stat-value {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-cyan);
}

.referee-stat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* Referee Card - Top Penalty */
.referee-top-penalty {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    padding: 0.5rem;
    background: var(--bg-glass);
    border-radius: 6px;
}

.referee-top-penalty strong {
    color: var(--accent-cyan);
}

/* =============================================================================
   Penalty Types Breakdown (in Modal)
   ============================================================================= */
.penalty-types-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.penalty-type-item {
    background: var(--bg-glass);
    border-radius: 8px;
    padding: 0.75rem;
}

.penalty-type-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.penalty-type-name {
    font-size: 0.85rem;
    color: var(--text-primary);
}

.penalty-type-pct {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-cyan);
    font-weight: 600;
}

.penalty-type-bar-bg {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

.penalty-type-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 3px;
    transition: width 0.5s ease;
}

/* =============================================================================
   Quarter Distribution (in Modal)
   ============================================================================= */
.quarter-dist-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-glass);
    border-radius: 12px;
}

.quarter-dist-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.quarter-label {
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.quarter-bar-container {
    width: 40px;
    height: 80px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    display: flex;
    align-items: flex-end;
    overflow: hidden;
}

.quarter-bar {
    width: 100%;
    background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 4px 4px 0 0;
    transition: height 0.5s ease;
}

.quarter-pct {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-cyan);
    font-weight: 600;
}

/* -----------------------------------------------------------------------------
   Charts
   ----------------------------------------------------------------------------- */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--gap-md);
}

.chart-container {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: var(--card-padding);
}

.chart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.chart-title {
    font-family: var(--font-display);
    font-size: 1rem;
}

.chart-wrapper {
    height: 280px;
    position: relative;
}

/* -----------------------------------------------------------------------------
   Data Table
   ----------------------------------------------------------------------------- */
.table-container {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    overflow: hidden;
}

.table-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.table-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
}

.table-legend {
    display: flex;
    gap: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.legend-dot.high { background: var(--accent-red); }
.legend-dot.low { background: var(--accent-green); }

.table-scroll {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-subtle);
}

th {
    background: var(--bg-glass);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    white-space: nowrap;
}

td {
    font-size: 0.9rem;
}

tbody tr {
    cursor: pointer;
    transition: background var(--transition-base);
}

tbody tr:hover td {
    background: var(--bg-glass);
}

.cell-high { color: var(--accent-red); }
.cell-low { color: var(--accent-green); }

/* -----------------------------------------------------------------------------
   Modals
   ----------------------------------------------------------------------------- */
.modal-overlay,
.explainer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active,
.explainer-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 24px;
    width: 100%;
    max-width: 900px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 2rem;
    border-bottom: 1px solid var(--border-subtle);
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    z-index: 1;
}

.modal-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1.25rem;
    transition: all var(--transition-base);
}

.modal-close:hover {
    background: var(--accent-red);
    color: white;
    border-color: var(--accent-red);
}

.modal-title {
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
}

.modal-subtitle {
    color: var(--text-secondary);
}

.modal-body {
    padding: 2rem;
}

/* Modal Stats */
.modal-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.modal-stat {
    text-align: center;
    padding: 1rem;
    background: var(--bg-glass);
    border-radius: 12px;
}

.modal-stat-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-cyan);
}

.modal-stat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-top: 0.25rem;
}

/* Modal Game List */
.game-list {
    max-height: 300px;
    overflow-y: auto;
}

.game-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-subtle);
    gap: 1rem;
}

.game-teams {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
}

.team-logo {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

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

.game-info {
    text-align: right;
    font-size: 0.85rem;
}

.game-score {
    font-weight: 600;
}

.game-date {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.game-penalties {
    background: var(--bg-glass);
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    text-align: center;
    min-width: 80px;
}

.game-penalties-value {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-cyan);
}

.game-penalties-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* Explainer Modal */
.explainer-modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 2rem;
    max-width: 500px;
    position: relative;
}

.explainer-modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
}

.explainer-modal h3 {
    color: var(--accent-cyan);
    margin-bottom: 1rem;
}

.explainer-modal p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.explainer-modal p:last-child {
    margin-bottom: 0;
}

/* -----------------------------------------------------------------------------
   Footer
   ----------------------------------------------------------------------------- */
footer {
    padding: 3rem 2rem;
    border-top: 1px solid var(--border-subtle);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.footer-disclaimer {
    max-width: 600px;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.footer-disclaimer strong {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-copyright {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* -----------------------------------------------------------------------------
   Animations
   ----------------------------------------------------------------------------- */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    width: 100%;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* -----------------------------------------------------------------------------
   Responsive
   ----------------------------------------------------------------------------- */
@media (max-width: 768px) {
    nav { padding: 1rem; }
    .nav-links { display: none; }
    
    .hero { padding: 5rem 1rem 3rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    
    .explainer-content { flex-direction: column; }
    
    .carousel-container { padding: 0 1rem; }
    .carousel-btn { display: none; }
    .insight-card { flex: 0 0 85vw; }
    
    .charts-grid { grid-template-columns: 1fr; }
    .chart-wrapper { height: 220px; }
    
    .modal { margin: 1rem; max-height: calc(100vh - 2rem); }
    
    .footer-content { flex-direction: column; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .referee-stats { grid-template-columns: repeat(2, 1fr); }
    .modal-stats-grid { grid-template-columns: repeat(2, 1fr); }
}