:root { color-scheme: light dark; --bg: #fff; --fg: #1c2024; --muted: #5f6872; --line: #d9dee3; --link: #0b63c5; }
@media (prefers-color-scheme: dark) { :root { --bg: #14171a; --fg: #e8ebee; --muted: #a0a9b2; --line: #30363c; --link: #79b4f5; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 1.0625rem/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
header, main, footer { max-width: 44rem; margin: 0 auto; padding: 1.25rem 1rem; }
header { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; justify-content: space-between; border-bottom: 1px solid var(--line); }
header nav { display: flex; flex-wrap: wrap; gap: .25rem 1rem; }
a { color: var(--link); }
.logo { font-weight: 700; color: var(--fg); text-decoration: none; }
h1 { font-size: 1.9rem; line-height: 1.2; margin: .5rem 0; }
h2 { font-size: 1.15rem; margin: 2rem 0 .25rem; }
.date, footer { color: var(--muted); font-size: .9375rem; }
footer { border-top: 1px solid var(--line); }