:root{--q-bg:#f5f6f8;--q-panel:#fff;--q-border:#d7dce3;--q-ink:#1f2937;--q-muted:#64748b;--q-blue:#2563eb;--q-blue-soft:#eff6ff;--q-dark:#111827}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--q-bg);color:var(--q-ink);font-family:Arial,Helvetica,sans-serif;line-height:1.55}.site-header{background:#fff;border-bottom:1px solid var(--q-border);position:sticky;top:0;z-index:30}.site-header-inner{max-width:1480px;margin:0 auto;padding:10px 18px;display:flex;align-items:center;justify-content:space-between;gap:16px}.site-title{font-weight:700;color:#0f172a}.site-title small{display:block;font-weight:400;color:var(--q-muted);font-size:12px}.site-tabs{display:flex;gap:8px;flex-wrap:wrap}.site-tabs a{color:#1d4ed8;text-decoration:none;border:1px solid var(--q-border);background:#fff;border-radius:6px;padding:6px 10px;font-size:13px}.site-layout{max-width:1480px;margin:0 auto;display:grid;grid-template-columns:280px minmax(0,1fr);gap:18px;padding:18px}.site-sidebar{position:sticky;top:62px;align-self:start;background:#fff;border:1px solid var(--q-border);border-radius:8px;max-height:calc(100vh - 82px);overflow:auto;padding:12px}.site-sidebar h2{font-size:14px;margin:14px 0 6px;color:#111827}.site-search{width:100%;border:1px solid var(--q-border);border-radius:6px;padding:9px;margin-bottom:10px}.site-nav-link{display:block;text-decoration:none;color:#334155;font-size:13px;padding:6px 7px;border-radius:5px;margin:1px 0}.site-nav-link:hover,.site-nav-link.active{background:var(--q-blue-soft);color:#1d4ed8}.site-main{min-width:0}.site-home-hero,.site-unit-hero{background:#fff;border:1px solid var(--q-border);border-radius:8px;padding:20px;margin-bottom:16px}.site-home-hero h1,.site-unit-hero h1{margin:0 0 8px}.site-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:12px}.site-index-link{display:block;background:#fff;border:1px solid var(--q-border);border-radius:8px;padding:14px;text-decoration:none;color:#1f2937}.site-index-link:hover{border-color:#93c5fd;background:#f8fbff}.site-page-actions{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:12px}.site-page-actions a{background:#fff;border:1px solid var(--q-border);border-radius:6px;color:#1d4ed8;text-decoration:none;padding:7px 10px;font-size:13px}.site-qlearn-frame{background:#fff;border:1px solid var(--q-border);border-radius:8px;padding:0;overflow:hidden}.site-qlearn-content{max-width:1120px;margin:0 auto;padding:20px 18px 40px}.site-qlearn-content img{max-width:100%;height:auto}.site-qlearn-content table{max-width:100%;border-collapse:collapse}.site-qlearn-content pre{white-space:pre-wrap;overflow-x:auto}.site-footer{max-width:1480px;margin:0 auto;padding:0 18px 24px;color:#94a3b8;font-size:12px}@media(max-width:900px){.site-layout{grid-template-columns:1fr}.site-sidebar{position:relative;top:auto;max-height:none}.site-header-inner{align-items:flex-start;flex-direction:column}}


/* Logical navigation structure */
.site-unit-home{display:block;text-decoration:none;color:#0f172a;font-weight:700;border-bottom:1px solid var(--q-border);padding:6px 7px 10px;margin-bottom:8px}
.site-sidebar h2{font-size:13px;margin:18px 0 8px;color:#0f172a;text-transform:none;border-top:1px solid var(--q-border);padding-top:12px}
.site-sidebar h2:first-of-type{margin-top:10px}
.site-sidebar h2 a{color:#0f172a;text-decoration:none}
.site-nav-group{margin:0 0 10px 0;padding:0 0 2px 0}
.site-nav-group h3{font-size:11px;line-height:1.25;text-transform:uppercase;letter-spacing:.04em;color:#64748b;margin:10px 0 4px;padding:0 7px;font-weight:700}
.site-nav-group .site-nav-link{padding-left:14px;border-left:2px solid transparent}
.site-nav-group .site-nav-link:hover,.site-nav-group .site-nav-link.active{border-left-color:#2563eb}
.site-index-section{background:#fff;border:1px solid var(--q-border);border-radius:8px;margin:0 0 16px;padding:16px}
.site-index-section h2{margin:0 0 10px;font-size:18px;color:#0f172a}
.site-index-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:8px 12px}
.site-index-row{display:block;text-decoration:none;color:#1f2937;border:1px solid var(--q-border);border-radius:6px;padding:9px 10px;background:#fff}
.site-index-row:hover{border-color:#93c5fd;background:#f8fbff;color:#1d4ed8}
.site-home-units{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:14px}
.site-home-unit{display:block;background:#fff;border:1px solid var(--q-border);border-radius:8px;padding:18px;text-decoration:none;color:#1f2937}
.site-home-unit strong{display:block;font-size:20px;margin-bottom:8px;color:#0f172a}
.site-home-unit span{display:block;color:#64748b}
.site-home-unit:hover{border-color:#93c5fd;background:#f8fbff}