:root {
  color-scheme: light dark;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --bg: #f5f5f7;
  --card: #ffffff;
  --accent: #007aff;
  --border: #e5e5ea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --bg: #000000;
    --card: #1c1c1e;
    --border: #38383a;
  }
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.55;
  margin: 0;
  background: var(--bg);
  color: var(--text);
}
header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 1.5rem;
}
header h1 { margin: 0 0 0.25rem; font-size: 1.5rem; }
header p { margin: 0; color: var(--muted); font-size: 0.95rem; }
nav {
  margin-top: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.9rem;
}
nav a { color: var(--accent); text-decoration: none; }
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 1.5rem;
}
article {
  background: var(--card);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--border);
}
h2 { font-size: 1.15rem; margin: 1.5rem 0 0.5rem; }
h2:first-child { margin-top: 0; }
p, li { font-size: 0.95rem; }
ul { padding-left: 1.25rem; }
footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 2rem 1rem;
}
.lang-note {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  color: var(--muted);
}