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

body {
    background: #0d0d0d;
    color: #cccccc;
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', system-ui, sans-serif;
    padding: 20px;
}

header {
    text-align: center;
    padding: 20px 0 30px;
}

h1 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #ffffff;
    letter-spacing: -0.02em;
}

.subtitle {
    color: #666;
    font-size: 0.85rem;
    margin-top: 6px;
}

.portfolio-section {
    max-width: 1800px;
    margin: 0 auto 40px;
}

.portfolio-section h2 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid #333;
}

.portfolio-section h2 .count {
    font-weight: 400;
    color: #666;
    font-size: 0.85rem;
    margin-left: 8px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.chart-card {
    background: #1a1a1a;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #222;
    transition: border-color 0.2s;
}

.chart-card:hover {
    border-color: #444;
}

.chart-card img {
    width: 100%;
    height: auto;
    display: block;
}

footer {
    text-align: center;
    padding: 30px 0;
    color: #444;
    font-size: 0.75rem;
}

@media (max-width: 1200px) {
    .grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 700px) {
    .grid { grid-template-columns: 1fr; }
}