:root {
  color: #293441;
  background: #f6f8fa;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.8;
}

* { box-sizing: border-box; }
body { margin: 0; }
.container { width: min(100% - 40px, 820px); margin-inline: auto; }
.site-header { padding: 52px 0 30px; background: #fff; border-bottom: 1px solid #e4e9ef; }
.site-label { margin: 0 0 12px; color: #657589; font-size: 12px; letter-spacing: 2px; }
h1 { margin: 0; color: #213e5c; font-size: clamp(28px, 5vw, 38px); line-height: 1.4; }
.intro { margin: 14px 0 22px; color: #657589; }
nav { display: flex; gap: 24px; }
a { color: #315b83; text-underline-offset: 4px; }
a:hover { color: #183c5e; }
a:focus-visible { outline: 2px solid #315b83; outline-offset: 5px; }
main { padding-block: 32px 40px; }
section { scroll-margin-top: 24px; }
h2 { margin: 0 0 20px; font-size: 22px; }
article { margin-bottom: 22px; padding: 26px 28px; background: #fff; border: 1px solid #e4e9ef; border-radius: 8px; }
.category { margin: 0 0 8px; color: #657589; font-size: 13px; }
h3 { margin: 0 0 14px; color: #213e5c; font-size: 20px; line-height: 1.5; }
p { margin: 12px 0; }
article > p:last-child { margin-bottom: 0; }
code { font-family: Consolas, "Liberation Mono", monospace; font-size: 0.92em; }
p code { padding: 2px 5px; border-radius: 3px; background: #f0f3f6; }
pre { margin: 18px 0; padding: 18px; overflow-x: auto; background: #f3f5f7; border: 1px solid #e4e9ef; border-radius: 5px; line-height: 1.65; }
.about { padding-top: 18px; }
.about h2 { margin-bottom: 12px; }
.site-footer { padding: 20px 0; border-top: 1px solid #e4e9ef; color: #657589; font-size: 13px; }
.site-footer p { margin: 0; }

@media (max-width: 560px) {
  .container { width: calc(100% - 32px); }
  .site-header { padding-top: 34px; }
  article { padding: 20px 18px; }
  h3 { font-size: 18px; }
  pre { padding: 14px; font-size: 13px; }
}