:root {
  --ink: #14202b;
  --mute: #5c6773;
  --line: #d3dae2;
  --paper: #eceff2;
  --well: #f3f5f7;
  --surface: #fff;
  --accent: #1f4fd8;
  color-scheme: light;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  min-height: 100dvh;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.6;
}
a { color: var(--accent); }
header {
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}
.bar {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 48px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 8px 0;
}
.brand {
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -0.03em;
}
nav { display: flex; flex-wrap: wrap; gap: 4px 12px; }
nav a { color: var(--mute); text-decoration: none; }
nav a[aria-current="page"], nav a:hover { color: var(--ink); }
main {
  width: min(760px, calc(100% - 32px));
  margin: 28px auto 64px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px 28px 32px;
}
h1 { margin: 0 0 8px; font-size: 32px; letter-spacing: -0.03em; line-height: 1.2; }
.lead { margin: 0 0 24px; color: var(--mute); }
h2 { margin: 28px 0 8px; font-size: 18px; }
ol, ul { margin: 0; padding-left: 1.2em; }
li + li { margin-top: 6px; }
code {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.92em;
  background: var(--well);
  padding: 0 4px;
  border-radius: 4px;
}
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.actions a {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 14px;
  border-radius: 8px;
  text-decoration: none;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}
.actions a.ghost { background: var(--well); color: var(--ink); }