:root {
  --bg: #f2f5fa; --surface: #ffffff; --text: #0f172a; --text2: #334155; --muted: #64748b;
  --border: #e2e8f0; --brand: #1352d1; --navy: #0b1f4b; --note: #eef4ff;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1324; --surface: #141b2d; --text: #e6eaf2; --text2: rgba(255,255,255,.8); --muted: rgba(255,255,255,.6);
    --border: rgba(255,255,255,.12); --brand: #6f9bff; --navy: #0d1324; --note: #1b2440;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif; }
a { color: var(--brand); }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px max(16px, calc((100% - 760px) / 2)); background: var(--navy); }
.bar a { color: #fff; text-decoration: none; }
.brand { font-weight: 700; letter-spacing: .2px; }
.bar nav { display: flex; gap: 18px; font-size: 14px; }
.bar nav a { opacity: .75; }
.bar nav a[aria-current="page"] { opacity: 1; text-decoration: underline; text-underline-offset: 4px; }
main { overflow-wrap: anywhere; max-width: 760px; margin: 24px auto; padding: 28px 32px 36px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 4px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
h3 { font-size: 15px; margin: 18px 0 4px; color: var(--text2); }
p, li { color: var(--text2); }
ul { padding-left: 22px; }
li { margin: 4px 0; }
code { font-size: 13px; background: var(--bg); border: 1px solid var(--border); border-radius: 5px; padding: 1px 5px; }
.meta { color: var(--muted); font-size: 14px; margin-top: 0; }
.note { background: var(--note); border-radius: 10px; padding: 12px 16px; color: var(--text2); font-size: 15px; }
footer { text-align: center; color: var(--muted); font-size: 13px; padding: 8px 16px 32px; }
footer a { color: var(--muted); }
@media (max-width: 640px) {
  main { margin: 0; border-radius: 0; border-left: 0; border-right: 0; padding: 22px 16px 28px; }
  h1 { font-size: 25px; }
}