:root {
  --bg: #ffffff;
  --fg: #1f2937;
  --muted: #6b7280;
  --accent: #0f766e;
  --border: #e5e7eb;
  --card: #f9fafb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111827;
    --fg: #e5e7eb;
    --muted: #9ca3af;
    --accent: #2dd4bf;
    --border: #374151;
    --card: #1f2937;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header { border-bottom: 1px solid var(--border); padding-bottom: 16px; margin-bottom: 24px; }
header .brand { font-weight: 700; color: var(--accent); text-decoration: none; }
nav.lang { margin-top: 8px; font-size: 14px; }
nav.lang a, nav.links a { color: var(--accent); }
h1 { font-size: 28px; line-height: 1.25; margin: 8px 0 4px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 6px; }
p.meta { color: var(--muted); font-size: 14px; margin: 0; }
ul { padding-left: 22px; }
li { margin: 4px 0; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 12px 16px; margin: 16px 0; }
hr { border: 0; border-top: 1px solid var(--border); margin: 48px 0; }
footer { color: var(--muted); font-size: 14px; border-top: 1px solid var(--border); margin-top: 48px; padding-top: 16px; }
a { overflow-wrap: anywhere; }