:root {
    --dark-gold: #D4AF37;
    --light-gold: #FBF0B2;
    --background-color: #1a1a1a;
    --text-color: #f0f0f0;
    --surface-color: #2c2c2c;
    --border-color: #444;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

header {
    background-color: var(--surface-color);
    padding: 1rem;
    border-bottom: 2px solid var(--dark-gold);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.logo {
    font-size: 2.5rem;
    font-weight: bold;
    letter-spacing: 3px;
    background: linear-gradient(to bottom, var(--light-gold), var(--dark-gold));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
    text-shadow: 0px 2px 4px rgba(0, 0, 0, 0.5);
}

h1 {
    margin: 0;
}

main {
    padding: 1rem;
}

.topic-section {
    margin-bottom: 3rem; /* Space between categories */
}

.leaderboard-container {
    background-color: var(--surface-color);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1rem;
    overflow-x: auto; /* Allows horizontal scrolling on small screens */
}

h2, h3 {
    color: var(--dark-gold); /* Fallback for older browsers */
    background: linear-gradient(to bottom, var(--light-gold), var(--dark-gold));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-fill-color: transparent;
    text-shadow: 0px 1px 3px rgba(0, 0, 0, 0.3);
}

.leaderboard {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.leaderboard th, .leaderboard td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.leaderboard thead {
    background-color: #333;
}

.leaderboard th {
    font-weight: bold;
}

.sortable {
    cursor: pointer;
}

footer {
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
    font-size: 0.9rem;
    color: #888;
}