:root { --bg: #fbf9f4; --text: #1b2a30; --muted: #5b6b70; --accent: #1a6b78; --card: #ffffff; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #0b1418; --text: #e9eef0; --muted: #9aaab0; --accent: #5fb8c4; --card: #12212a; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 2rem; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--accent); }
.card { background: var(--card); border-radius: 14px; padding: 16px 18px; margin: 16px 0; }
header { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }
header img { width: 48px; height: 48px; border-radius: 11px; }
nav a { margin-right: 16px; }