:root {
  color-scheme: light;
  --ink: #213a42;
  --muted: #48636a;
  --accent: #216f76;
  --rule: #cbdadb;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  color: var(--ink);
  background: #f3f7f6;
  font-synthesis: none;
}
* { box-sizing: border-box; }
body { margin: 0; }
main { width: min(1120px, calc(100% - 96px)); margin: 0 auto; padding: 76px 0 36px; }
h1, h2, p { margin: 0; }
h1 { font-size: clamp(30px, 4.1vw, 48px); font-weight: 650; line-height: 1.3; letter-spacing: -.02em; }
h2 { font-size: 23px; line-height: 1.5; font-weight: 650; }
p { font-size: 16px; line-height: 1.95; }
.subtitle { margin-top: 16px; font-size: 20px; color: var(--accent); }
.lead { max-width: 760px; margin-top: 28px; font-size: 18px; color: var(--muted); }
.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 38px; margin-top: 52px; border-top: 1px solid var(--rule); padding-top: 30px; }
.features p { margin-top: 15px; color: var(--muted); }
.tutorials { margin-top: 48px; padding-top: 30px; border-top: 1px solid var(--rule); }
.tutorials p { max-width: 760px; margin-top: 15px; color: var(--muted); }
footer { margin-top: 48px; border-top: 1px solid var(--rule); padding-top: 24px; }
footer p { font-size: 14px; color: var(--muted); }
a { color: var(--accent); text-underline-offset: 4px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 2px; }
.features h2 a { color: inherit; text-decoration-color: var(--rule); }
.features h2 a:hover { color: var(--accent); }
.article-list { padding-left: 1.4em; margin: 20px 0 0; }
.article-list li { padding-left: 3px; margin: 12px 0; line-height: 1.7; }
.article-list a { font-size: 16px; }
.article-page { max-width: 850px; padding-top: 36px; }
.site-nav { padding-bottom: 24px; border-bottom: 1px solid var(--rule); }
.site-nav a { text-decoration: none; font-size: 15px; }
.article-body { padding-top: 34px; }
.article-body h1 { font-size: clamp(27px, 3.3vw, 38px); line-height: 1.5; margin-bottom: 28px; }
.article-body p { font-size: 17px; line-height: 2; margin-top: 22px; }
@media (max-width: 700px) {
  main { width: calc(100% - 40px); padding-top: 42px; padding-bottom: 24px; }
  .subtitle { font-size: 17px; }
  .lead { font-size: 16px; margin-top: 22px; }
  .features { grid-template-columns: 1fr; gap: 28px; margin-top: 32px; padding-top: 24px; }
  h2 { font-size: 21px; }
  .features p, .tutorials p { margin-top: 10px; }
  .tutorials, footer { margin-top: 32px; padding-top: 24px; }
  .article-page { padding-top: 24px; }
  .article-body { padding-top: 26px; }
  .article-body p { font-size: 16px; margin-top: 20px; }
}