:root {
    color-scheme: light dark;
    --bg: #f5f5f7;
    --surface: #ffffff;
    --text: #1c1c1e;
    --text-secondary: #6e6e73;
    --accent: #2f6df3;
    --border: rgba(0, 0, 0, 0.08);
    --radius: 14px;
    --max-width: 720px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #000000;
        --surface: #1c1c1e;
        --text: #f2f2f7;
        --text-secondary: #98989f;
        --accent: #6e9aff;
        --border: rgba(255, 255, 255, 0.10);
    }
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -webkit-text-size-adjust: 100%;
}

.wrap {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 32px 20px 64px;
}

header {
    margin-bottom: 28px;
}

.eyebrow {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin: 0 0 8px;
}

h1 {
    font-size: 32px;
    font-weight: 700;
    margin: 0 0 8px;
    letter-spacing: -0.4px;
}

.subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin: 0;
}

.card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 22px 24px;
    margin: 16px 0;
    border: 1px solid var(--border);
}

h2 {
    font-size: 20px;
    font-weight: 600;
    margin: 28px 0 10px;
    letter-spacing: -0.2px;
}

h2:first-child {
    margin-top: 0;
}

h3 {
    font-size: 16px;
    font-weight: 600;
    margin: 18px 0 6px;
}

p, li {
    font-size: 15px;
    color: var(--text);
}

p {
    margin: 0 0 12px;
}

ul, ol {
    padding-left: 22px;
    margin: 0 0 12px;
}

li {
    margin-bottom: 6px;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.muted {
    color: var(--text-secondary);
    font-size: 13px;
}

.divider {
    height: 1px;
    background: var(--border);
    margin: 20px 0;
    border: 0;
}

nav.top {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 24px;
    font-size: 14px;
}

nav.top a {
    color: var(--text-secondary);
}

nav.top a.active {
    color: var(--text);
    font-weight: 600;
}

.tiles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin: 20px 0 0;
}

.tile {
    display: block;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 18px 20px;
    color: var(--text);
    transition: transform 0.12s ease, border-color 0.12s ease;
}

.tile:hover {
    text-decoration: none;
    border-color: var(--accent);
    transform: translateY(-1px);
}

.tile .tile-title {
    font-weight: 600;
    font-size: 15px;
    margin: 0 0 4px;
}

.tile .tile-detail {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0;
}

footer {
    margin-top: 48px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 12px;
}

footer a {
    color: var(--text-secondary);
}