.site-header { position: sticky; z-index: 40; top: 0; height: var(--header-h); border-bottom: 1px solid transparent; background: rgb(251 252 250 / .78); backdrop-filter: saturate(1.4) blur(14px); -webkit-backdrop-filter: saturate(1.4) blur(14px); transition: border-color var(--duration) var(--ease-out); }
.site-header.is-scrolled { border-color: var(--border); }
.site-header__inner, .page-shell, .home-shell, .site-footer__inner { width: min(calc(100% - 48px), var(--container)); margin: 0 auto; }
.site-header__inner { display: flex; height: 100%; align-items: center; }
.brand { display: inline-flex; flex: 0 0 260px; align-items: center; gap: 9px; color: var(--text); font-size: 1.125rem; font-weight: 600; letter-spacing: -.01em; line-height: 1; text-decoration: none; }
.brand img { color: var(--text); }
.header-tabs { display: flex; align-self: stretch; align-items: center; gap: var(--space-1); }
.header-menu { position: relative; display: flex; height: 100%; align-items: center; }
.header-tab { position: relative; display: inline-flex; min-height: 40px; align-items: center; padding: 0 4px 0 10px; color: var(--text-muted); font-size: .875rem; font-weight: 500; line-height: 1; text-decoration: none; }
.header-tab:hover, .header-menu.is-active .header-tab { color: var(--accent); }
.header-menu.is-active::after { position: absolute; right: 4px; bottom: -1px; left: 10px; height: 2px; background: var(--accent); content: ""; }
.menu-toggle { display: inline-grid; width: 32px; height: 40px; place-items: center; padding: 0; border: 0; background: transparent; color: var(--text-muted); cursor: pointer; }
.menu-toggle svg { width: 12px; height: 12px; fill: none; opacity: .6; stroke: currentColor; stroke-width: 1.5; transition: transform var(--duration) var(--ease-out); }
.menu-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }
.menu-toggle:hover, .menu-toggle[aria-expanded="true"] { color: var(--text); }
.tab-menu { position: absolute; z-index: 50; top: calc(100% + 8px); left: 0; width: max-content; min-width: 280px; max-width: 340px; padding: 6px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); box-shadow: var(--shadow-pop); opacity: 0; pointer-events: none; transform: translateY(-4px) scale(.98); transform-origin: top left; transition: opacity 100ms var(--ease-out), transform 100ms var(--ease-out), visibility 100ms; visibility: hidden; }
.tab-menu::before { position: absolute; top: -10px; right: 0; left: 0; height: 10px; content: ""; }
.header-menu.is-open .tab-menu { opacity: 1; pointer-events: auto; transform: translateY(0) scale(1); transition-duration: 160ms; visibility: visible; }
.tab-menu a { position: relative; display: block; padding: 8px 12px; border-radius: var(--radius-item); color: var(--text); text-decoration: none; }
.tab-menu a:hover, .tab-menu a:focus { background: var(--tint); color: var(--accent); outline: 0; }
.tab-menu a[aria-current="page"] { background: var(--tint); color: var(--accent); }
.tab-menu a[aria-current="page"]::before { position: absolute; top: 8px; bottom: 8px; left: 0; width: 3px; border-radius: 3px; background: var(--accent); content: ""; }
.tab-menu span, .tab-menu small { display: block; }
.tab-menu span { font-size: .875rem; font-weight: 500; line-height: 1.35; }
.tab-menu small { margin-top: 2px; color: var(--text-muted); font-size: .8125rem; line-height: 1.35; }
@media (hover: hover) and (pointer: fine) { .header-menu.is-open .tab-menu { transition-duration: 160ms; } }
.header-actions { display: flex; align-items: center; gap: var(--space-2); margin-left: auto; }
.search-trigger, .github-link { display: inline-flex; min-height: 32px; align-items: center; gap: 6px; border: 0; border-radius: 999px; background: transparent; color: var(--text-muted); font-size: .875rem; text-decoration: none; }
.search-trigger { padding: 0 10px; cursor: pointer; }
.search-trigger:hover { background: var(--surface-sunken); color: var(--text); }
.search-trigger svg, .github-link svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.75; }
.github-link svg { fill: currentColor; stroke: none; }
.search-trigger kbd { padding: 1px 4px; border: 1px solid var(--border); border-radius: 4px; color: var(--text-muted); font-size: .6875rem; }
.drawer-trigger { display: none; width: 40px; height: 40px; padding: 10px; border: 0; border-radius: var(--radius-item); background: var(--tint); color: var(--accent); cursor: pointer; }
.drawer-trigger span { display: block; height: 2px; margin: 3px 0; border-radius: 2px; background: currentColor; }
.page-shell { padding: var(--space-12) 0 var(--space-16); }
.docs-grid { display: grid; grid-template-columns: 260px minmax(0, 760px) 220px; gap: clamp(24px, 3.4vw, 48px); justify-content: center; }
.docs-main { min-width: 0; }
.content-column { width: 100%; max-width: 760px; }
.docs-sidebar, .page-toc { position: sticky; top: var(--header-h); align-self: start; height: calc(100dvh - var(--header-h)); padding: 0 0 48px; overflow-y: auto; overscroll-behavior: contain; scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
.sidebar-group + .sidebar-group { margin-top: 20px; }
.sidebar-group > p { margin: 0 0 var(--space-1); color: var(--text); font-size: .75rem; font-weight: 600; line-height: 1.5; }
.sidebar-group ul, .page-toc ul { margin: 0; padding: 0; list-style: none; }
.sidebar-group a { display: block; padding: 6px 10px; border-radius: var(--radius-item); color: var(--text-muted); font-size: .875rem; line-height: 1.45; text-decoration: none; }
.sidebar-group a:hover { background: var(--surface-sunken); color: var(--text); }
.sidebar-group a[aria-current="page"] { background: var(--tint); color: var(--accent); }
.page-toc { padding-left: var(--space-3); }
.page-toc__title { margin: 0 0 var(--space-2); color: var(--text); font-size: .8125rem; font-weight: 600; }
.page-toc a { position: relative; display: block; padding: 4px 0; color: var(--text-muted); font-size: .8125rem; line-height: 1.45; text-decoration: none; }
.page-toc .toc-level-3 a { padding-left: 12px; }
.page-toc a:hover, .page-toc a.is-active { color: var(--accent); }
.page-toc a.is-active::before { position: absolute; top: 3px; bottom: 3px; left: -11px; width: 2px; border-radius: 2px; background: var(--accent); content: ""; }
.compact-toc { display: none; margin: 0 0 var(--space-6); border: 1px solid var(--border); border-radius: var(--radius-item); background: var(--surface); }
.compact-toc summary { padding: var(--space-2) var(--space-3); color: var(--accent); font-size: .875rem; font-weight: 500; cursor: pointer; }
.compact-toc ul { margin: 0; padding: 0 var(--space-3) var(--space-3); list-style: none; }
.compact-toc a { color: var(--text-muted); font-size: .875rem; text-decoration: none; }
.site-drawer[hidden] { display: none; }
.site-drawer { position: fixed; z-index: 80; inset: 0; }
.site-drawer__backdrop { position: absolute; inset: 0; background: rgb(23 39 45 / .24); }
.site-drawer__panel { position: relative; width: min(340px, 88vw); height: 100%; padding: var(--space-4); overflow: auto; background: var(--surface); box-shadow: var(--shadow-pop); transform: translateX(-100%); transition: transform var(--duration-slow) var(--ease-out); }
.site-drawer.is-open .site-drawer__panel { transform: translateX(0); }
.site-drawer__header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-5); }
.site-drawer__header p { margin: 0; color: var(--text); font-weight: 600; }
.site-drawer__header button { width: 40px; height: 40px; border: 0; border-radius: var(--radius-item); background: var(--surface-sunken); color: var(--text); font-size: 1.5rem; cursor: pointer; }
.section-label { margin: 0 0 var(--space-3); color: var(--accent); font-size: .8125rem; line-height: 1.4; }
.site-footer { border-top: 1px solid var(--border); }
.site-footer__inner { padding: var(--space-8) 0; color: var(--text-muted); font-size: .875rem; }
.footer-columns { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-8); }
.footer-columns p { margin: 0 0 var(--space-2); color: var(--text); font-size: .8125rem; font-weight: 600; }
.footer-columns ul { margin: 0; padding: 0; list-style: none; }
.footer-columns a { color: var(--text-muted); font-size: .875rem; text-decoration: none; }
.footer-columns a:hover { color: var(--accent); }
.footer-signoff { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); margin: var(--space-8) 0 0; padding-top: var(--space-4); border-top: 1px solid var(--border); }
.brand--footer { flex-basis: auto; font-size: 1rem; }
.not-found { width: min(calc(100% - 48px), 760px); min-height: calc(100vh - var(--header-h) - 10rem); margin: 0 auto; padding: var(--space-16) 0; }
@supports not (backdrop-filter: blur(1px)) { .site-header { background: var(--bg); } }
@media (prefers-reduced-transparency: reduce) { .site-header { background: var(--bg); backdrop-filter: none; -webkit-backdrop-filter: none; } }
@media (max-width: 1279px) { .docs-grid { grid-template-columns: 260px minmax(0, 760px); } .page-toc { display: none; } .compact-toc { display: block; } }
/* Seven tabs need the full desktop width; below it the drawer carries navigation. */
@media (max-width: 1279px) { .brand { flex-basis: auto; } .header-tabs { display: none; } .drawer-trigger { display: block; } }
@media (max-width: 1100px) { .brand { flex-basis: auto; } .header-tabs { display: none; } .github-link { display: none; } .search-trigger span, .search-trigger kbd { display: none; } .search-trigger { width: 40px; justify-content: center; padding: 0; } .drawer-trigger { display: block; } .docs-grid { display: block; } .docs-sidebar { display: none; } .content-column { max-width: 760px; margin: 0 auto; } }
@media (max-width: 640px) { .site-header__inner, .page-shell, .home-shell, .site-footer__inner { width: min(calc(100% - 32px), var(--container)); } .footer-columns { gap: var(--space-6); } .footer-signoff { align-items: flex-start; flex-direction: column; } }