:root {
  --bg: #ffffff; --text: #111820; --muted: #68737d; --line: #e7ecf0; --surface: #f1f5f8; --accent: #1d5c8a;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1113; --text: #eceef0; --muted: #8d959c; --line: #23272b; --surface: #1b1e21; --accent: #7fb6e0; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 48px 20px 64px; }
a { color: var(--accent); }
h1 { font-size: 34px; letter-spacing: -0.02em; margin: 0 0 8px; line-height: 1.15; }
h2 { font-size: 20px; margin: 32px 0 6px; }
p, li { margin: 0 0 12px; }
.lead { font-size: 19px; color: var(--muted); margin-bottom: 24px; }
.icon { width: 112px; height: 112px; border-radius: 25px; display: block; margin-bottom: 24px; }
.note { background: var(--surface); border-radius: 12px; padding: 14px 16px; font-size: 15px; color: var(--muted); }
nav { display: flex; gap: 18px; flex-wrap: wrap; border-top: 1px solid var(--line); margin-top: 48px; padding-top: 16px; font-size: 15px; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--text); }