:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #666;
  --border: #e5e5e5;
  --accent: #ff7a00;
  --accent-soft: #fff1e0;
  --code-bg: #f4f4f4;
  --link: #c45000;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f10;
    --fg: #ececec;
    --muted: #9a9a9a;
    --border: #2a2a2a;
    --accent: #ff8a1a;
    --accent-soft: #2a1c0c;
    --code-bg: #1a1a1c;
    --link: #ffb15a;
  }
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
body {
  max-width: 880px;
  margin: 0 auto;
  padding: 32px 28px 96px;
}
header.site {
  border-bottom: 1px solid var(--border);
  padding-bottom: 18px;
  margin-bottom: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
header.site .brand {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
}
header.site .brand a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
}
header.site nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 16px;
  font-size: 14px;
}
header.site nav a:hover { color: var(--accent); }

h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.3;
  margin: 1.6em 0 0.6em;
}
h1 { font-size: 2em; margin-top: 0.2em; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
h2 { font-size: 1.45em; padding-bottom: 6px; border-bottom: 1px dashed var(--border); }
h3 { font-size: 1.15em; }
h4 { font-size: 1.02em; }
p { margin: 0.9em 0; }
a { color: var(--link); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color .15s; }
a:hover { border-bottom-color: var(--link); }
strong { color: var(--fg); font-weight: 700; }
em { color: var(--fg); }
hr { border: 0; border-top: 1px solid var(--border); margin: 2.4em 0; }
ul, ol { padding-left: 1.4em; }
li { margin: 0.32em 0; }
blockquote {
  margin: 1.2em 0;
  padding: 0.4em 1.1em;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  color: var(--fg);
  border-radius: 0 6px 6px 0;
}
blockquote p { margin: 0.4em 0; }
code {
  background: var(--code-bg);
  padding: 0.12em 0.4em;
  border-radius: 4px;
  font-size: 0.92em;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}
pre {
  background: var(--code-bg);
  padding: 14px 16px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.9em;
  line-height: 1.55;
}
pre code { background: transparent; padding: 0; }
table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.2em 0;
  font-size: 0.95em;
}
table th, table td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}
table th {
  background: var(--accent-soft);
  font-weight: 600;
}
table tr:nth-child(even) td { background: rgba(127,127,127,0.04); }

.meta {
  color: var(--muted);
  font-size: 13px;
  margin-top: -8px;
  margin-bottom: 32px;
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
  margin: 24px 0;
}
.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  background: var(--bg);
  transition: transform .12s, border-color .15s;
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.card a {
  color: var(--fg);
  border-bottom: 0;
}
.card .title {
  font-weight: 700;
  font-size: 17px;
  margin-bottom: 6px;
}
.card .desc {
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.55;
}
.card .tag {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 11px;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 999px;
  margin-bottom: 8px;
  font-weight: 600;
}
.hero {
  margin: 8px 0 24px;
  padding: 20px 22px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  background: var(--accent-soft);
}
.hero h1 { border: 0; padding: 0; margin: 0 0 6px; font-size: 1.5em; }
.hero p { margin: 0.3em 0; }
footer.site {
  margin-top: 80px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
footer.site a { color: var(--muted); }
.docnav {
  display: flex;
  justify-content: space-between;
  margin: 36px 0 12px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  gap: 12px;
}
.docnav a {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--fg);
  border-bottom: 1px solid var(--border);
}
.docnav a:hover { border-color: var(--accent); }
.docnav .label { display: block; font-size: 12px; color: var(--muted); }
.docnav .next { text-align: right; }
@media (max-width: 640px) {
  body { padding: 22px 18px 80px; font-size: 16px; }
  h1 { font-size: 1.6em; }
  table { font-size: 0.86em; }
  .cards { grid-template-columns: 1fr; }
}