:root {
  --bg: #ffffff; --bg-elev: #f6f7f9; --text: #111827; --muted: #6b7280; --border: #e5e7eb;
  --accent: #2563eb; --accent-weak: #dbeafe; --shadow: 0 1px 2px rgba(0,0,0,.06), 0 4px 12px rgba(0,0,0,.04);
  --sidebar-w: 268px; --header-h: 64px; --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  : :root { --bg:#0b0e14; --bg-elev:#121621; --text:#e5e7eb; --muted:#9ca3af; --border:#1f2937; --accent:#60a5fa; --accent-weak:#0b2942; }
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font:16px/1.5 ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue",Arial;background:var(--bg);color:var(--text)}
a{color:inherit}
.layout{
  display:grid;height:100dvh;
  grid-template-rows: var(--header-h) 1fr;
  grid-template-columns: var(--sidebar-w) minmax(0,1fr);
  grid-template-areas: "header header" "sidebar main";
}
.site-header{grid-area:header;position:sticky;top:0;z-index:50;background:var(--bg);border-bottom:1px solid var(--border);box-shadow:var(--shadow)}
.header-inner{max-width:1200px;margin:0 auto;height:100%;display:flex;align-items:center;gap:12px;padding:0 16px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700}
.brand .logo{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--accent),transparent 70%),var(--accent-weak);border:1px solid var(--border)}
.sidebar-toggle{display:none;border:1px solid var(--border);background:var(--bg);padding:8px 10px;border-radius:10px;cursor:pointer}
nav.top{display:flex;gap:6px;margin-left:auto;align-items:center;overflow-x:auto}
nav.top a{padding:10px 12px;border-radius:10px;border:1px solid transparent;text-decoration:none;white-space:nowrap}
nav.top a:hover{background:var(--bg-elev)}
nav.top a[aria-current="page"]{background:var(--accent-weak);border-color:var(--accent)}
.kbd{font:12px/1 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;border:1px solid var(--border);border-bottom-width:2px;border-radius:6px;padding:2px 6px;color:var(--muted)}
.sidebar{grid-area:sidebar;border-right:1px solid var(--border);background:var(--bg);padding:12px;position:relative;overflow:hidden}
.sidebar-inner{position:sticky;top:calc(var(--header-h) + 12px);max-height:calc(100dvh - var(--header-h) - 24px);overflow:auto;padding-right:6px}
.menu{display:flex;flex-direction:column;gap:6px}
.group-title{font-size:12px;text-transform:uppercase;color:var(--muted);padding:10px 10px 4px;letter-spacing:.6px}
.menu a{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit;padding:10px 12px;border-radius:10px}
.menu a:hover{background:var(--bg-elev)}
main{grid-area:main;overflow:auto;padding:24px clamp(16px,4vw,40px)}
section.anchor{scroll-margin-top:calc(var(--header-h) + 16px);padding:16px;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);box-shadow:var(--shadow);margin:0 0 24px 0}
section.anchor h2{margin:0 0 6px}
.muted{color:var(--muted)}
.site-footer{padding:24px clamp(16px,4vw,40px);border-top:1px solid var(--border);color:var(--muted)}
.overlay{position:fixed;inset:0;display:none}
.overlay.open{display:block}
.overlay .scrim{position:absolute;inset:0;background:rgba(0,0,0,.4)}
.overlay .panel{position:absolute;left:50%;top:12vh;transform:translateX(-50%);width:min(720px,92vw);background:var(--bg);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow)}
.search-input{width:100%;border:0;padding:14px 16px;outline:none;background:var(--bg);border-bottom:1px solid var(--border);border-top-left-radius:14px;border-top-right-radius:14px}
.results{max-height:60vh;overflow:auto}
.result{display:flex;align-items:center;gap:8px;padding:10px 14px;text-decoration:none;color:inherit}
.result[aria-selected="true"], .result:hover{background:var(--bg-elev)}
.overlay-footer{display:flex;justify-content:space-between;gap:8px;padding:10px 14px;border-top:1px solid var(--border)}
.img-responsive{display:block;max-width:100%;height:auto;border-radius:12px;border:1px solid var(--border);box-shadow:var(--shadow)}
@media (max-width:900px){
  .layout{grid-template-columns:1fr;grid-template-areas:"header" "main"}
  .sidebar{position:fixed;inset:var(--header-h) auto 0 0;width:min(86vw,340px);transform:translateX(-100%);transition:transform .25s ease;z-index:60;box-shadow:var(--shadow)}
  .sidebar.open{transform:translateX(0)}
  .sidebar-toggle{display:inline-flex}
  .sidebar-scrim{display:none;position:fixed;inset:var(--header-h) 0 0 0;backdrop-filter:blur(1px);background:rgba(0,0,0,.25);z-index:55}
  .sidebar-scrim.visible{display:block}
}
@media (prefers-reduced-motion: reduce){
  *{transition-duration:.001ms !important;animation-duration:.001ms !important;animation-iteration-count:1 !important;scroll-behavior:auto !important}
}