:root { color-scheme: light dark; --text: #1d1d1f; --muted: #6e6e73; --bg: #fff; --line: #e5e5ea; --accent: #0071e3; }
@media (prefers-color-scheme: dark) { :root { --text: #f5f5f7; --muted: #98989f; --bg: #0d0e11; --line: #2a2b30; --accent: #2997ff; } }
* { box-sizing: border-box; }
body { margin: 0; color: var(--text); background: var(--bg); font: 17px/1.55 -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; }
a { color: var(--accent); text-decoration: none; }
.top { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 24px; max-width: 760px; margin: 0 auto; padding: 16px; border-bottom: 1px solid var(--line); }
.brand { font-size: 20px; font-weight: 700; color: var(--text); }
.top nav { display: flex; gap: 16px; font-size: 15px; }
.top nav a[aria-current] { color: var(--text); font-weight: 600; }
main { max-width: 760px; margin: 0 auto; padding: 24px 16px 40px; }
h1 { margin: 8px 0 12px; font-size: clamp(28px, 6vw, 40px); line-height: 1.15; letter-spacing: -.02em; }
h2 { margin: 36px 0 10px; font-size: 22px; line-height: 1.25; }
h3 { margin: 18px 0 4px; font-size: 17px; }
p, ol { margin: 0 0 12px; }
ol { padding-left: 22px; }
.lead { font-size: 19px; color: var(--muted); }
.go { display: inline-block; margin-top: 8px; padding: 12px 24px; border-radius: 999px; font-weight: 600; color: #fff; background: #0071e3; }
footer { display: flex; flex-wrap: wrap; gap: 8px 20px; max-width: 760px; margin: 0 auto; padding: 16px 16px 32px; border-top: 1px solid var(--line); font-size: 14px; }