:root {
  --bg: #f6f8fc;
  --card: #ffffff;
  --text: #16203a;
  --muted: #5a6784;
  --brand: #1b5fd6;
  --note: #fff6e0;
  --note-border: #f5c25a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1426;
    --card: #13203a;
    --text: #e6ecf8;
    --muted: #9aa8c4;
    --brand: #7fa8f5;
    --note: #2a2410;
    --note-border: #8a6a1c;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, "Segoe UI", Roboto, Inter, sans-serif;
}
header {
  position: sticky;
  top: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: linear-gradient(135deg, #1b5fd6, #0b3c91);
  color: #fff;
}
.brand { font-weight: 800; font-size: 20px; }
.langs { display: flex; gap: 6px; }
.langs a {
  color: #fff;
  text-decoration: none;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  font-size: 14px;
}
.langs a.on { background: #fff; color: #0b3c91; }
main { max-width: 760px; margin: 0 auto; padding: 16px; }
section {
  background: var(--card);
  border-radius: 16px;
  padding: 8px 20px 20px;
  margin-bottom: 16px;
}
h1 { font-size: 26px; margin: 16px 0 4px; }
h2 { font-size: 18px; margin: 22px 0 6px; }
.meta { color: var(--muted); margin-top: 0; }
.note {
  background: var(--note);
  border-left: 4px solid var(--note-border);
  padding: 10px 12px;
  border-radius: 8px;
}
a { color: var(--brand); }
code { font-size: 14px; }
ul { padding-left: 20px; }
li { margin: 6px 0; }