:root {
    --bg: #fafafa;
    --fg: #1a1a1a;
    --muted: #666;
    --accent: #2563eb;
    --card-bg: #fff;
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    --card-shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.12);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0d1117;
        --fg: #e6edf3;
        --muted: #8b949e;
        --accent: #58a6ff;
        --card-bg: #161b22;
        --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
        --card-shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.6);
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

main {
    max-width: 640px;
    margin: 0 auto;
    padding: 4rem 1.5rem;
}

header {
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    margin: 0 0 0.5rem 0;
    font-weight: 700;
    letter-spacing: -0.02em;
}

header .tag {
    color: var(--muted);
    margin: 0;
    font-size: 1.1rem;
}

.links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 4rem;
}

.card {
    display: block;
    padding: 1.25rem 1.5rem;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    text-decoration: none;
    color: inherit;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--card-shadow-hover);
}

.card h2 {
    font-size: 1.15rem;
    margin: 0 0 0.25rem 0;
    color: var(--accent);
    font-weight: 600;
}

.card p {
    margin: 0;
    color: var(--muted);
    font-size: 0.95rem;
}

footer {
    color: var(--muted);
    font-size: 0.85rem;
    text-align: center;
    margin-top: 4rem;
}

footer a {
    color: var(--muted);
    text-decoration: underline;
}

footer a:hover {
    color: var(--fg);
}

@media (max-width: 480px) {
    main { padding: 2.5rem 1rem; }
    header h1 { font-size: 2rem; }
}