:root {
  --bg: #f7fbfc;
  --surface: #ffffff;
  --surface-alt: #eef7f8;
  --text: #16313a;
  --muted: #54707a;
  --primary: #0f766e;
  --primary-dark: #0b5d57;
  --line: #d9e7ea;
  --accent: #dff5f2;
  --code-bg: #10272e;
  --max: 1240px;
  --radius: 14px;
  --shadow: 0 8px 24px rgba(13, 35, 41, 0.06);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--primary-dark); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--primary); }
a:focus-visible, summary:focus-visible { outline: 3px solid #f2b544; outline-offset: 3px; }
.wrap { width: min(100% - 32px, var(--max)); margin: 0 auto; }
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 16px; top: 16px; z-index: 1000; padding: 10px 14px; color: var(--text); background: #fff; border-radius: 10px; }

.site-header { position: sticky; top: 0; z-index: 40; border-bottom: 1px solid var(--line); background: rgba(247, 251, 252, 0.97); backdrop-filter: blur(6px); }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 14px 0; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; letter-spacing: .1px; text-decoration: none; }
.brand-mark { width: 38px; height: 38px; flex: 0 0 auto; border-radius: 10px; background: linear-gradient(135deg, var(--primary), #39b7a7); }
.site-nav ul { display: flex; flex-wrap: wrap; gap: 16px; margin: 0; padding: 0; list-style: none; }
.site-nav a { color: var(--text); font-size: .97rem; text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--primary-dark); font-weight: 700; }

.breadcrumb { padding: 18px 0 10px; font-size: .9rem; color: var(--muted); }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.breadcrumb li:not(:last-child)::after { margin-left: 8px; content: "/"; color: #81979f; }
.breadcrumb [aria-current="page"] { color: var(--text); }

.docs-shell { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 36px; align-items: start; padding: 18px 0 60px; }
.docs-shell > div { min-width: 0; }
.docs-sidebar { position: sticky; top: 86px; max-height: calc(100vh - 110px); overflow-y: auto; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.docs-sidebar h2 { margin: 0 0 14px; font-size: 1rem; }
.docs-sidebar h3 { margin: 18px 0 6px; font-size: .84rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.docs-sidebar ul { margin: 0; padding: 0; list-style: none; }
.docs-sidebar li { margin: 3px 0; }
.docs-sidebar a { display: block; padding: 5px 7px; border-radius: 7px; color: var(--text); font-size: .9rem; line-height: 1.35; text-decoration: none; }
.docs-sidebar a:hover { background: var(--surface-alt); }
.docs-sidebar a[aria-current="page"] { color: var(--primary-dark); background: var(--accent); font-weight: 700; }
.mobile-doc-nav { display: none; }

.doc-article { min-width: 0; padding: clamp(24px, 4vw, 48px); border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.doc-article h1, .doc-article h2, .doc-article h3 { line-height: 1.25; letter-spacing: -.02em; scroll-margin-top: 96px; }
.doc-article h1 { margin: 0 0 14px; font-size: clamp(2rem, 4vw, 3rem); }
.doc-article h2 { margin: 2.2rem 0 .8rem; padding-top: .2rem; font-size: clamp(1.45rem, 2.5vw, 2rem); }
.doc-article h3 { margin: 1.7rem 0 .6rem; font-size: 1.22rem; }
.doc-article p { margin: 0 0 1rem; }
.doc-article li + li { margin-top: .35rem; }
.doc-article code { padding: .1em .3em; border-radius: 5px; background: var(--surface-alt); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .92em; }
.doc-article pre { overflow-x: auto; margin: 1rem 0 1.4rem; padding: 18px; border-radius: 11px; color: #e8f4f3; background: var(--code-bg); line-height: 1.5; }
.doc-article pre code { padding: 0; color: inherit; background: transparent; }
.doc-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 0 0 26px; padding: 13px 16px; border-left: 4px solid var(--primary); background: var(--surface-alt); color: var(--muted); font-size: .88rem; }
.doc-meta .source-link { flex-basis: 100%; width: fit-content; margin-top: 3px; font-size: .92rem; }
.doc-byline { font-size: .95rem; color: var(--muted); }
.table-wrap { overflow-x: auto; margin: 1rem 0 1.5rem; }
table { width: 100%; border-collapse: collapse; font-size: .94rem; }
th, td { padding: 10px 12px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--surface-alt); }
.page-toc { margin: 24px 0; padding: 18px 22px; border: 1px solid var(--line); border-radius: 10px; background: #fbfdfd; }
.page-toc h2 { margin: 0 0 8px; padding: 0; font-size: 1rem; }
.page-toc ul { margin: 0; padding-left: 20px; columns: 2; }
.doc-pagination { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 42px; padding-top: 24px; border-top: 1px solid var(--line); }
.doc-pagination a { display: block; padding: 14px; border: 1px solid var(--line); border-radius: 10px; text-decoration: none; }
.doc-pagination .next { text-align: right; }
.pagination-label { display: block; color: var(--muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; }

.hub-intro { color: var(--muted); font-size: 1.08rem; }
.hub-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin-top: 24px; }
.hub-card { padding: 20px; border: 1px solid var(--line); border-radius: 12px; background: #fbfdfd; }
.hub-card h2 { margin: 0 0 10px; padding: 0; font-size: 1.25rem; }
.hub-card ul { margin-bottom: 0; padding-left: 20px; }

.site-footer { padding: 38px 0; border-top: 1px solid var(--line); background: #eef7f8; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 24px; }
.site-footer h2 { margin: 0 0 10px; font-size: 1rem; }
.site-footer p, .site-footer li { font-size: .9rem; }
.footer-links { margin: 0; padding-left: 18px; }

@media (max-width: 900px) {
  .topbar { align-items: flex-start; flex-direction: column; }
  .site-header { position: static; }
  .docs-shell { grid-template-columns: 1fr; gap: 16px; }
  .docs-sidebar { display: none; }
  .mobile-doc-nav { display: block; margin-bottom: 16px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface-alt); }
  .mobile-doc-nav summary { cursor: pointer; padding: 12px 14px; font-weight: 700; }
  .mobile-doc-nav .docs-sidebar { position: static; display: block; max-height: none; margin: 0 12px 12px; box-shadow: none; }
  .footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .wrap { width: min(100% - 22px, var(--max)); }
  .site-nav ul { gap: 10px 14px; }
  .doc-article { padding: 22px 18px; }
  .page-toc ul { columns: 1; }
  .hub-grid, .doc-pagination { grid-template-columns: 1fr; }
  .doc-pagination .next { text-align: left; }
}

@media print {
  .site-header, .docs-sidebar, .mobile-doc-nav, .site-footer, .doc-pagination { display: none; }
  body { background: #fff; }
  .docs-shell { display: block; padding: 0; }
  .doc-article { padding: 0; border: 0; box-shadow: none; }
}