:root {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --accent: #38bdf8;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
}

header {
    padding: 2rem;
    text-align: center;
    border-bottom: 1px solid #334155;
}

header h1 {
    margin: 0;
    font-size: 2.2rem;
}

header p {
    margin-top: 0.5rem;
    color: var(--muted);
}

main {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--card);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 10px 30px rgba(0,0,0,.3);
}

.card h2 {
    margin-top: 0;
    color: var(--accent);
}

ul {
    list-style: none;
    padding: 0;
}

li {
    margin: 0.6rem 0;
}

a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
}

a:hover {
    color: var(--accent);
}

footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--muted);
    font-size: 0.9rem;
}