:root {
  --bg: #ffffff;
  --panel: #f6f8fb;
  --text: #0f1b2d;
  --muted: #56657a;
  --line: #e1e6ee;
  --primary: #115388;
  --teal: #0ba297;
  --code-bg: #0f1b2d;
  --code-text: #e6edf7;
  --inline-code: #eef3f9;
  --callout: #eef7f6;
  --warn: #fff6e5;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg: #0b1320;
    --panel: #0f1a2b;
    --text: #e6edf7;
    --muted: #9badc4;
    --line: #1f2d44;
    --primary: #6cb2ee;
    --teal: #2ccfc1;
    --code-bg: #060c16;
    --code-text: #dce6f3;
    --inline-code: #18263b;
    --callout: #0e2626;
    --warn: #2a2312;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { scroll-padding-top: 72px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif; }
a { color: var(--primary); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--teal); outline-offset: 2px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 8px; z-index: 50; background: var(--bg); padding: 8px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.topbar { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 16px; height: 60px; padding: 0 16px; background: var(--bg); border-bottom: 1px solid var(--line); }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); text-decoration: none; }
.logo span:not(.mark) { color: var(--muted); font-weight: 500; }
.mark { width: 26px; height: 26px; border-radius: 7px; background: linear-gradient(135deg, #115388, #0ba297); }
.top-links { margin-inline-start: auto; display: flex; gap: 18px; font-size: 0.92rem; }
.top-links a { color: var(--muted); text-decoration: none; }
.top-links a:hover { color: var(--text); }
.menu { display: none; background: none; border: 1px solid var(--line); border-radius: 8px; color: var(--text); font-size: 1.1rem; padding: 4px 10px; }
.shell { display: grid; grid-template-columns: 250px minmax(0, 1fr); max-width: 1240px; margin: 0 auto; }
.shell.wide { max-width: none; }
.sidebar { position: sticky; top: 60px; align-self: start; height: calc(100vh - 60px); overflow-y: auto; padding: 20px 16px 40px; border-inline-end: 1px solid var(--line); font-size: 0.94rem; }
.sidebar ul { list-style: none; margin: 0 0 12px; padding: 0; }
.sidebar a { display: block; padding: 5px 10px; border-radius: 8px; color: var(--muted); text-decoration: none; }
.sidebar a:hover { color: var(--text); background: var(--panel); }
.sidebar a[aria-current='page'] { color: var(--primary); background: var(--panel); font-weight: 600; }
.nav-section { margin: 14px 10px 6px; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); font-weight: 700; }
.content { min-width: 0; padding: 32px 48px 80px; max-width: 860px; }
.shell.wide .content { max-width: none; padding: 16px 0 0; }
h1 { font-size: 2.1rem; line-height: 1.2; margin: 0 0 16px; }
h2 { font-size: 1.45rem; margin: 40px 0 12px; padding-top: 8px; border-top: 1px solid var(--line); }
h3 { font-size: 1.12rem; margin: 28px 0 8px; }
h2, h3, h4 { position: relative; }
.anchor { position: absolute; inset-inline-start: -1em; color: var(--muted); text-decoration: none; opacity: 0; }
h2:hover .anchor, h3:hover .anchor { opacity: 1; }
blockquote { margin: 16px 0; padding: 12px 16px; background: var(--callout); border-inline-start: 4px solid var(--teal); border-radius: 8px; }
blockquote p { margin: 0; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.88em; background: var(--inline-code); padding: 1px 6px; border-radius: 5px; }
pre { position: relative; background: var(--code-bg); color: var(--code-text); padding: 16px; border-radius: 10px; overflow-x: auto; font-size: 0.86rem; line-height: 1.55; }
pre code { background: none; padding: 0; color: inherit; font-size: inherit; }
.copy { position: absolute; top: 8px; inset-inline-end: 8px; font: 600 0.75rem system-ui; color: var(--code-text); background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.18); border-radius: 6px; padding: 3px 8px; cursor: pointer; }
table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 0.93rem; display: block; overflow-x: auto; }
th, td { text-align: start; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--panel); }
img { max-width: 100%; }
.pager { display: flex; justify-content: space-between; gap: 16px; margin-top: 56px; }
.pager a { flex: 1; max-width: 48%; padding: 12px 16px; border: 1px solid var(--line); border-radius: 10px; text-decoration: none; color: var(--text); font-weight: 600; }
.pager a span { display: block; font-size: 0.78rem; color: var(--muted); font-weight: 500; }
.pager-next { text-align: end; margin-inline-start: auto; }
.ref-note { margin: 0 16px 8px; font-size: 0.9rem; color: var(--muted); }
li input[type='checkbox'] { margin-inline-end: 6px; }
@media (max-width: 860px) {
  .menu { display: inline-block; }
  .top-links { display: none; }
  .shell { grid-template-columns: minmax(0, 1fr); }
  .sidebar { display: none; position: fixed; inset: 60px 0 0 0; height: auto; background: var(--bg); z-index: 15; border: 0; }
  body.nav-open .sidebar { display: block; }
  .content { padding: 24px 16px 64px; }
  h1 { font-size: 1.7rem; }
  .anchor { display: none; }
}