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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: #4f46e5;
}

.nav-brand i {
    font-size: 2rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #374151;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #4f46e5;
}

/* Hero Section */
.hero {
    padding: 120px 2rem 80px;
    text-align: center;
    color: white;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 3rem;
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: #fbbf24;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Sections */
section {
    margin-bottom: 0;
}

/* Ensure in-page anchor targets are visible beneath fixed header */
section[id] {
    scroll-margin-top: 100px;
}

.leaderboard, .metrics, .about {
    background: white;
    padding: 80px 0;
}

.leaderboard {
    background: #f8fafc;
}

.about {
    background: #f1f5f9;
}

h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #1f2937;
}


/* Filters */
.filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.filters select {
    padding: 0.75rem 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    background: white;
    font-size: 1rem;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.filters select:focus {
    outline: none;
    border-color: #4f46e5;
}

/* Leaderboard Table */
.leaderboard-table {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

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

thead {
    background: #4f46e5;
    color: white;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #e5e7eb;
}

th {
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

tbody tr:hover {
    background: #f9fafb;
}

.table-play-btn {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.table-play-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px -2px rgba(16, 185, 129, 0.3);
}

.rank-1 {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    font-weight: 700;
}

.rank-2 {
    background: linear-gradient(135deg, #c0c0c0, #e5e5e5);
    font-weight: 600;
}

.rank-3 {
    background: linear-gradient(135deg, #cd7f32, #daa520);
    font-weight: 600;
}

/* Metrics Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.metric-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.metric-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px -3px rgba(0, 0, 0, 0.15);
}

.metric-card h3 {
    color: #4f46e5;
    margin-bottom: 1rem;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.metric-card h3 i {
    font-size: 1.5rem;
}

.metric-card p {
    color: #6b7280;
    margin-bottom: 1rem;
}

.metric-card ul {
    list-style: none;
}

.metric-card li {
    padding: 0.25rem 0;
    color: #374151;
}

.metric-card li:before {
    content: "✓";
    color: #10b981;
    font-weight: bold;
    margin-right: 0.5rem;
}

/* About Section */
.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-section {
    margin-bottom: 3rem;
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.about-section h3 {
    color: #1f2937;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    border-bottom: 2px solid #4f46e5;
    padding-bottom: 0.5rem;
}

.about-section p {
    color: #374151;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.process-steps {
    margin-top: 2rem;
}

.process-step {
    display: flex;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: #f8fafc;
    border-radius: 8px;
    border-left: 4px solid #4f46e5;
}

.step-number {
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    color: white;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    margin-right: 1.5rem;
    flex-shrink: 0;
}

.step-content h4 {
    color: #1f2937;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.step-content p {
    color: #6b7280;
    margin: 0;
    font-size: 0.95rem;
}

/* Footer */
.footer {
    background: #1f2937;
    color: white;
    text-align: center;
    padding: 2rem 0;
}

.footer a {
    color: #60a5fa;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: #93c5fd;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-stats {
        gap: 1.5rem;
    }


    .filters {
        flex-direction: column;
        align-items: center;
    }

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

    table {
        min-width: 600px;
    }
}

@media (max-width: 480px) {
    h2 {
        font-size: 1.75rem;
    }

    .nav-brand {
        font-size: 1.25rem;
    }

    .nav-brand i {
        font-size: 1.5rem;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }

    th, td {
        padding: 0.5rem;
        font-size: 0.9rem;
    }
}