:root {
  color-scheme: light dark;
  --fg: #1c1c1e;
  --muted: #6e6e73;
  --bg: #fbfbfd;
  --line: #e2e2e6;
  --accent: #2b5d8a;
}
@media (prefers-color-scheme: dark) {
  :root { --fg: #f2f2f7; --muted: #a1a1a6; --bg: #121214; --line: #2c2c2e; --accent: #8fbbe0; }
}
* { box-sizing: border-box; }
html { font-size: 17px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}
.wrap { max-width: 42rem; margin: 0 auto; padding: 3rem 1.25rem 4rem; }
.hero { margin-bottom: 2.5rem; }
.eyebrow { color: var(--muted); font-size: .9rem; letter-spacing: .04em; margin: 0 0 .5rem; }
h1 { font-size: 2rem; line-height: 1.25; margin: 0 0 .75rem; }
h2 { font-size: 1.25rem; margin: 2.25rem 0 .5rem; }
h3 { font-size: 1.05rem; margin: 1.5rem 0 .25rem; }
.lede { font-size: 1.1rem; color: var(--muted); margin: 0; }
p, li { margin: .5rem 0; }
ul { padding-left: 1.25rem; }
ul.links { list-style: none; padding: 0; }
ul.links li { padding: .6rem 0; border-top: 1px solid var(--line); }
ul.links li:last-child { border-bottom: 1px solid var(--line); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
table { border-collapse: collapse; width: 100%; font-size: .95rem; margin: .75rem 0; }
th, td { text-align: left; vertical-align: top; padding: .5rem .5rem .5rem 0; border-top: 1px solid var(--line); }
th { color: var(--muted); font-weight: 500; }
.note { color: var(--muted); font-size: .92rem; }
.todo { background: rgba(255, 196, 0, .18); padding: 0 .25rem; border-radius: .2rem; }
footer { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }
nav.crumbs { font-size: .9rem; color: var(--muted); margin-bottom: 1.5rem; }