:root {
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #007aff;
  --line: #d2d2d7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #0a84ff;
    --line: #38383a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 16px; margin-bottom: 8px; }
header img { width: 64px; height: 64px; border-radius: 14px; }
header h1 { margin: 0; font-size: 28px; line-height: 1.2; }
nav.lang { margin: 8px 0 24px; color: var(--muted); font-size: 15px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
section { background: var(--card); border-radius: 16px; padding: 8px 24px 20px; margin-bottom: 24px; }
h2 { font-size: 22px; margin: 20px 0 4px; }
h3 { font-size: 17px; margin: 20px 0 4px; }
p, ul { margin: 6px 0; }
ul { padding-left: 22px; }
.muted { color: var(--muted); font-size: 15px; }
footer { color: var(--muted); font-size: 14px; text-align: center; }