:root { color-scheme: light; --ink: #1b1f24; --muted: #5b6470; --line: #e3e6ea; --accent: #2457d6; }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--ink); background: #fbfbfc; }
header, main, footer { max-width: 44rem; margin: 0 auto; padding: 1.25rem 1.5rem; }
header { display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; align-items: baseline; justify-content: space-between; border-bottom: 1px solid var(--line); }
header nav { display: flex; gap: 1rem; }
.brand { font-weight: 600; color: var(--ink); text-decoration: none; }
a { color: var(--accent); }
h1 { font-size: 1.75rem; line-height: 1.25; margin: 1rem 0; }
h2 { font-size: 1.1rem; margin: 1.75rem 0 0.5rem; }
.updated, footer { color: var(--muted); font-size: 0.9rem; }
footer { border-top: 1px solid var(--line); margin-top: 2rem; }