:root {
  --ink: #1b1d21;
  --muted: #6b7078;
  --line: #e4e6ea;
  --accent: #2b5f8a;
  --bg: #ffffff;
  --code: #f4f5f7;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.site-header {
  border-bottom: 1px solid var(--line);
  padding: 26px 0;
}

.wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-header .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.brand {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.brand:hover { text-decoration: none; color: var(--accent); }

.site-nav a {
  margin-left: 22px;
  font-size: 15px;
  color: var(--muted);
}

.site-nav a:hover { color: var(--accent); text-decoration: none; }

main { padding: 56px 0 96px; }

h1 {
  font-size: 34px;
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 650;
  margin: 0 0 12px;
}

h2 {
  font-size: 21px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  font-weight: 600;
  margin: 44px 0 12px;
}

h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 30px 0 8px;
}

p { margin: 0 0 20px; }

.lede {
  font-size: 19px;
  color: var(--muted);
  margin-bottom: 40px;
}

ul, ol { margin: 0 0 20px; padding-left: 22px; }
li { margin-bottom: 8px; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14.5px;
  background: var(--code);
  padding: 2px 6px;
  border-radius: 4px;
}

pre {
  background: var(--code);
  border-radius: 8px;
  padding: 18px 20px;
  overflow-x: auto;
  margin: 0 0 24px;
  line-height: 1.6;
}

pre code { background: none; padding: 0; font-size: 14px; }

blockquote {
  margin: 0 0 24px;
  padding-left: 18px;
  border-left: 2px solid var(--line);
  color: var(--muted);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 24px;
  font-size: 15.5px;
}

th, td {
  text-align: left;
  padding: 9px 12px;
  border-bottom: 1px solid var(--line);
}

th { font-weight: 600; color: var(--muted); font-size: 14px; }

.post-list { list-style: none; padding: 0; margin: 0; }

.post-list li {
  margin: 0;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.post-list li:first-child { padding-top: 0; }

.post-list .title {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
  display: block;
  margin-bottom: 6px;
}

.post-list .title a { color: var(--ink); }
.post-list .title a:hover { color: var(--accent); text-decoration: none; }

.post-list .meta {
  font-size: 14px;
  color: var(--muted);
}

.post-meta {
  font-size: 14.5px;
  color: var(--muted);
  margin-bottom: 40px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.post-nav {
  margin-top: 56px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 44px;
  font-size: 14px;
  color: var(--muted);
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.notfound {
  padding: 80px 0 120px;
  text-align: center;
}

.notfound .code {
  font-size: 15px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 14px;
}

@media (max-width: 560px) {
  body { font-size: 16.5px; }
  h1 { font-size: 28px; }
  .lede { font-size: 17px; }
  main { padding: 40px 0 72px; }
  .site-nav a { margin-left: 0; margin-right: 18px; }
}