:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
    --container-width: 1200px;
}

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

body {
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: var(--accent-gradient);
    padding: 60px 0;
    text-align: center;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

#last-updated {
    margin-top: 15px;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.8);
}

/* Main Layout */
main {
    padding: 40px 0;
}

.category-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

section {
    background: rgba(30, 41, 59, 0.5);
    border: 2px solid rgba(56, 189, 248, 0.3);
    border-radius: 16px;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

section h2 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--accent-color);
}

/* Grid & Cards */
.grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 400px; /* Fixed height for scrollability */
    overflow-y: auto;
    padding-right: 8px;
}

/* Custom Scrollbar */
.grid::-webkit-scrollbar {
    width: 6px;
}

.grid::-webkit-scrollbar-track {
    background: rgba(15, 23, 42, 0.1);
    border-radius: 10px;
}

.grid::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 10px;
    opacity: 0.5;
}

.grid::-webkit-scrollbar-thumb:hover {
    background: #818cf8;
}

.card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 15px;
    transition: transform 0.2s ease, background 0.2s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px -3px rgba(0, 0, 0, 0.2);
    border-color: var(--accent-color);
    background: rgba(30, 41, 59, 0.8);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
}

.rank {
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
    background: var(--accent-gradient);
    padding: 2px 6px;
    border-radius: 4px;
    white-space: nowrap;
}

.card-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--accent-color);
}

.card-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 0;
    background-color: #020617;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 900px) {
    .category-group {
        grid-template-columns: 1fr;
    }
}