:root { --bg: #f4f6fa; --text: #111827; --muted: #5b6474; --card: #ffffff; --accent: #d9481c; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #0c1220; --text: #eef1f6; --muted: #9aa4b5; --card: #151d2e; --accent: #ff8a4c; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
       font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
header img { width: 56px; height: 56px; border-radius: 13px; }
header a { color: inherit; text-decoration: none; font-weight: 700; font-size: 22px; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 20px; 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: 18px 20px; margin: 16px 0; }
ul { padding-left: 22px; }
footer { margin-top: 48px; color: var(--muted); font-size: 15px; }
footer a { margin-right: 16px; }