:root {
    --bg: #f7f9fb;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --accent: #7c9cff;
    --radius: 16px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f172a;
        --card: #111827;
        --text: #f9fafb;
        --muted: #9ca3af;
        --accent: #9fb4ff;
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 48px 20px;
}

header {
    text-align: center;
    margin-bottom: 60px;
}

h1 {
    font-size: 3rem;
    margin-bottom: 12px;
}

h2 {
    font-size: 1.6rem;
    margin-bottom: 12px;
}

p {
    color: var(--muted);
    font-size: 1.05rem;
}

.hero {
    margin-bottom: 64px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.04);
}

footer {
    text-align: center;
    padding: 48px 20px;
    font-size: 0.9rem;
}

nav a {
    color: var(--accent);
    margin: 0 10px;
    text-decoration: none;
    font-weight: 500;
}

    nav a:hover {
        text-decoration: underline;
    }