:root {
    --primary: #6366f1;
    --secondary: #a855f7;
    --background: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
    --accent-up: #22c55e;
    --accent-down: #ef4444;
}

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

body {
    font-family: 'Outfit', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.6;
    background-image: radial-gradient(circle at top left, rgba(99, 102, 241, 0.18), transparent),
                      radial-gradient(circle at bottom right, rgba(168, 85, 247, 0.18), transparent);
    background-attachment: fixed;
    min-height: 100vh;
    scroll-behavior: smooth;
}

.highlight {
    color: var(--primary);
    position: relative;
    display: inline-block;
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 0;
    width: 100%;
    height: 8px;
    background: var(--primary);
    opacity: 0.2;
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

header {
    text-align: center;
    margin-bottom: 50px;
}

header h1 {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(to right, #fff, var(--text-dim));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 15px;
    letter-spacing: -1px;
}

.subtitle {
    color: var(--text-dim);
    font-size: 1.2rem;
    letter-spacing: 1px;
}

.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 25px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.stat-card h3 {
    font-size: 0.9rem;
    color: var(--text-dim);
    text-transform: uppercase;
    margin-bottom: 10px;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-change {
    font-size: 0.9rem;
    font-weight: 500;
}

.stat-change.up { color: var(--accent-up); }
.stat-change.down { color: var(--accent-down); }

.charts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.chart-container {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 30px;
}

.chart-container.wide {
    grid-column: span 2;
}

.chart-container h2 {
    font-size: 1.2rem;
    margin-bottom: 25px;
    color: var(--text-main);
    border-left: 4px solid var(--primary);
    padding-left: 15px;
}

footer {
    text-align: center;
    margin-top: 60px;
    color: var(--text-dim);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }
    .chart-container.wide {
        grid-column: span 1;
    }
    header h1 {
        font-size: 2rem;
    }
}