:root {
  --bg: #ffffff; --fg: #1d1f23; --muted: #5d636d; --line: #e2e4e8; --side: #f5f6f8;
  --accent: #2f65ca; --code: #f1f2f4; --warn: #fff6e0; --warn-line: #e3b34c; --tip: #eaf3ff; --tip-line: #7aa7e8;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #1e1f22; --fg: #e4e6ea; --muted: #9aa0aa; --line: #34363b; --side: #25272b;
          --accent: #6ea8ff; --code: #2b2d31; --warn: #3a3222; --warn-line: #b8892e; --tip: #1f2b3d; --tip-line: #4c7fc4; }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 "Segoe UI", system-ui, -apple-system, sans-serif; }
nav { position: fixed; top: 0; left: 0; bottom: 0; width: 270px; overflow-y: auto; background: var(--side);
      border-right: 1px solid var(--line); padding: 20px 16px; font-size: 14.5px; }
nav .brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; margin-bottom: 4px; }
nav .brand img { width: 30px; height: 30px; }
nav .lang { font-size: 13px; margin: 0 0 14px 40px; }
nav ol { padding-left: 28px; margin: 0; }
nav li { margin: 3px 0; }
nav a { color: var(--fg); text-decoration: none; }
nav a:hover { color: var(--accent); }
main { margin-left: 270px; max-width: 1020px; padding: 28px 44px 80px; }
h1 { font-size: 30px; margin: 0 0 6px; }
h2 { font-size: 23px; margin: 46px 0 10px; padding-top: 10px; border-top: 1px solid var(--line); }
h3 { font-size: 18px; margin: 26px 0 6px; }
p, li { max-width: 820px; }
a { color: var(--accent); }
code, kbd { font-family: Consolas, "DejaVu Sans Mono", monospace; font-size: 0.92em; background: var(--code);
            padding: 1px 5px; border-radius: 4px; }
kbd { border: 1px solid var(--line); border-bottom-width: 2px; }
.ui { font-weight: 600; }
figure { margin: 16px 0 22px; }
figure img { max-width: 100%; border: 1px solid var(--line); border-radius: 6px; display: block; }
figcaption { color: var(--muted); font-size: 14px; margin-top: 6px; }
table { border-collapse: collapse; margin: 12px 0 18px; font-size: 15px; }
th, td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
th { background: var(--side); }
.note, .warn { padding: 10px 14px; border-radius: 6px; margin: 14px 0; max-width: 820px; }
.note { background: var(--tip); border-left: 4px solid var(--tip-line); }
.warn { background: var(--warn); border-left: 4px solid var(--warn-line); }
.lead { color: var(--muted); font-size: 17px; margin-top: 0; }
.steps li { margin: 6px 0; }
@media (max-width: 900px) {
  nav { position: static; width: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  main { margin-left: 0; padding: 20px 16px 60px; }
}