:root { --bg: #f7f8fb; --card: #fff; --text: #1d2433; --muted: #5d6779; --accent: #2f6fe0; --border: #e3e7ef; }
@media (prefers-color-scheme: dark) { :root { --bg: #0f1216; --card: #161b22; --text: #e6edf3; --muted: #8b97a6; --accent: #6ea0ff; --border: #2a323d; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 "Segoe UI", system-ui, -apple-system, sans-serif; }
header, main, footer { max-width: 820px; margin: 0 auto; padding: 0 16px; }
header { display: flex; align-items: center; gap: 12px; padding-top: 28px; flex-wrap: wrap; }
header .logo { font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; }
header nav { margin-left: auto; display: flex; gap: 16px; flex-wrap: wrap; }
a { color: var(--accent); }
main { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 24px 28px; margin-top: 20px; }
h1 { margin-top: 0; font-size: 28px; line-height: 1.25; }
h2 { font-size: 20px; margin-top: 28px; }
.muted { color: var(--muted); }
.lang { border-top: 1px solid var(--border); margin-top: 32px; padding-top: 8px; }
footer { color: var(--muted); font-size: 14px; padding: 20px 16px 40px; }
@media (max-width: 600px) { main { padding: 18px; } h1 { font-size: 24px; } }