:root {
  --text: #172B4D;
  --text-muted: #6B778C;
  --border: #DFE1E6;
  --bg: #F4F5F7;
  --panel: #FFFFFF;
  --head-bg: #FAFBFC;
  --link: #0052CC;
  --link-hover: #003884;
  --code-bg: #F4F5F7;
  --pre-bg: #091E42;
  --pre-fg: #DEEBFF;
  --table-stripe: #FAFBFC;
  --pass: #006644;
  --fail: #BF2600;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
}
.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}
nav.sidebar {
  background: #0747A6;
  color: white;
  padding: 24px 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
nav.sidebar h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.7;
  margin: 0 0 16px;
}
nav.sidebar a {
  display: block;
  color: white;
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 14px;
  margin-bottom: 4px;
}
nav.sidebar a:hover { background: rgba(255,255,255,0.15); }
nav.sidebar a.active { background: rgba(255,255,255,0.2); font-weight: 600; }
nav.sidebar .meta {
  font-size: 12px;
  opacity: 0.6;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid rgba(255,255,255,0.2);
}
main {
  padding: 40px 56px;
  max-width: 1100px;
  width: 100%;
}
main h1 {
  font-size: 32px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--text);
}
main h2 {
  font-size: 24px;
  font-weight: 600;
  margin: 36px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
main h3 {
  font-size: 19px;
  font-weight: 600;
  margin: 28px 0 8px;
}
main h4 {
  font-size: 16px;
  font-weight: 600;
  margin: 20px 0 6px;
  color: var(--text-muted);
}
main p { margin: 8px 0 12px; }
main a { color: var(--link); text-decoration: none; }
main a:hover { color: var(--link-hover); text-decoration: underline; }
main code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 3px;
  font-family: "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 90%;
}
main pre {
  background: var(--pre-bg);
  color: var(--pre-fg);
  padding: 16px 20px;
  border-radius: 6px;
  overflow-x: auto;
  font-family: "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  line-height: 1.45;
}
main pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}
main blockquote {
  border-left: 4px solid #0052CC;
  background: #DEEBFF;
  margin: 16px 0;
  padding: 12px 16px;
  border-radius: 0 4px 4px 0;
}
main blockquote p:first-child { margin-top: 0; }
main blockquote p:last-child { margin-bottom: 0; }
main table {
  border-collapse: collapse;
  margin: 16px 0;
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  font-size: 14px;
}
main table th {
  background: var(--head-bg);
  font-weight: 600;
  text-align: left;
  padding: 10px 12px;
  border-bottom: 2px solid var(--border);
  color: var(--text);
}
main table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
main table tr:nth-child(even) td { background: var(--table-stripe); }
main table tr:last-child td { border-bottom: none; }
main ul, main ol { margin: 8px 0 12px; padding-left: 28px; }
main li { margin-bottom: 4px; }
main hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }
.banner {
  background: #DEEBFF;
  border: 1px solid #B3D4FF;
  border-radius: 4px;
  padding: 16px 20px;
  margin-bottom: 24px;
  font-size: 14px;
}
.banner strong { color: #0747A6; }
.toc-mini {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 12px 16px;
  margin: 16px 0 28px;
  font-size: 13px;
}
.toc-mini h4 { margin: 0 0 6px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); }
.toc-mini a { display: block; padding: 2px 0; }
footer {
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 12px;
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  nav.sidebar { height: auto; position: static; }
  main { padding: 24px; }
}