:root { --accent: #c8102e; --ink: #1f2328; --muted: #59636e; --line: #d8dee4; --bg: #f6f8fa; }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--ink); background: #fff; }
header { background: var(--bg); border-bottom: 1px solid var(--line); }
header .wrap { display: flex; gap: 24px; align-items: center; padding: 12px 24px; }
header a { color: var(--muted); text-decoration: none; font-size: 15px; }
header a.on { color: var(--ink); font-weight: 600; }
header .home { color: var(--accent); font-weight: 700; }
.wrap { max-width: 920px; margin: 0 auto; }
main { padding: 32px 24px 64px; }
h1 { font-size: 30px; margin: 0 0 8px; }
.lead { color: var(--muted); font-size: 18px; margin: 0 0 32px; }
h2 { font-size: 22px; margin: 48px 0 12px; padding-top: 8px; border-top: 1px solid var(--line); }
h3 { font-size: 18px; margin: 28px 0 8px; }
ol.steps { padding-left: 0; list-style: none; counter-reset: s; }
ol.steps > li { counter-increment: s; position: relative; padding-left: 44px; margin: 0 0 24px; }
ol.steps > li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 30px; height: 30px; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 700; text-align: center; line-height: 30px; font-size: 15px; }
figure { margin: 12px 0 0; }
figure img, figure svg { max-width: 100%; border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 1px 4px rgba(0,0,0,.06); display: block; }
figcaption { color: var(--muted); font-size: 14px; margin-top: 6px; }
code { background: var(--bg); border: 1px solid var(--line); border-radius: 4px; padding: 1px 6px; font-size: 14px; }
pre { background: #0d1117; color: #e6edf3; padding: 14px 16px; border-radius: 8px; overflow-x: auto; font-size: 14px; }
pre code { background: none; border: 0; padding: 0; color: inherit; }
.note { background: #fff8e6; border: 1px solid #f0d27a; border-radius: 8px; padding: 12px 16px; margin: 16px 0; }
.tip { background: #eef6ff; border: 1px solid #b6d4fb; border-radius: 8px; padding: 12px 16px; margin: 16px 0; }
table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 15px; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--bg); }
.toc { background: var(--bg); border-radius: 8px; padding: 12px 20px; }
.toc a { color: var(--accent); }