:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #13202e;
  --muted: #5a6878;
  --accent: #1f7a5c;
  --line: #e2e6ea;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1d3a;
    --surface: #12294a;
    --text: #e8eef5;
    --muted: #a7b6c6;
    --accent: #5fd3a5;
    --line: #23406a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 20px 64px; }
a { color: var(--accent); }
header.brand { display: flex; align-items: center; gap: 14px; margin-bottom: 32px; }
header.brand img { width: 56px; height: 56px; border-radius: 13px; }
header.brand a { color: inherit; text-decoration: none; font-weight: 700; font-size: 22px; }
h1 { font-size: 34px; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 20px; margin: 36px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; margin: 24px 0; }
footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); }
footer a { color: var(--muted); }
.card > :first-child { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }