:root{--bg:#f8fafc;--panel:#fff;--text:#0f172a;--muted:#64748b;--line:#e2e8f0;--accent:#2563eb;--accent2:#1d4ed8;--code:#f1f5f9;--shadow:0 1px 3px rgba(15,23,42,.06),0 8px 24px rgba(15,23,42,.04)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.75 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif}.topbar{height:68px;position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 28px;gap:24px}.brand{display:flex;align-items:baseline;min-width:240px}.brand a{text-decoration:none;font-weight:800;font-size:24px;letter-spacing:-.5px}.brand-nb{color:#2563eb}.brand-net{color:#0f172a}.brand-sub{color:var(--muted);font-size:13px;margin-left:8px}.topnav{display:flex;gap:4px;flex:1}.topnav a{padding:8px 12px;border-radius:8px;color:#475569;text-decoration:none}.topnav a:hover,.topnav a.active{background:#eff6ff;color:var(--accent)}.search-wrap{width:230px}.search-wrap input{width:100%;padding:9px 12px;border:1px solid var(--line);border-radius:9px;background:#f8fafc;outline:none}.search-wrap input:focus{border-color:#93c5fd;background:#fff}.search-results{position:fixed;right:28px;top:62px;z-index:30;width:420px;max-height:480px;overflow:auto;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);display:none}.search-results.open{display:block}.search-result{display:block;padding:12px 14px;border-bottom:1px solid #f1f5f9;text-decoration:none;color:inherit}.search-result:last-child{border-bottom:0}.search-result strong{display:block;color:#0f172a}.search-result small{display:block;color:var(--muted);margin-top:2px}.layout{display:grid;grid-template-columns:280px minmax(0,900px);max-width:1260px;margin:0 auto;gap:42px;padding:28px 28px 60px}aside{position:sticky;top:92px;align-self:start;max-height:calc(100vh - 120px);overflow:auto;padding-right:10px}.side-section{margin-bottom:22px}.side-title{font-weight:700;font-size:13px;color:#334155;margin:0 0 8px}.side-link{display:block;padding:7px 10px;margin:1px 0;border-radius:7px;text-decoration:none;color:#64748b}.side-link:hover{background:#f1f5f9;color:#0f172a}.side-link.active{background:#eff6ff;color:var(--accent);font-weight:600}main{min-width:0}.breadcrumbs{font-size:13px;color:var(--muted);margin:8px 0 22px}.breadcrumbs a{color:var(--muted);text-decoration:none}.breadcrumbs span{margin:0 6px;color:#94a3b8}article{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:38px 44px;box-shadow:var(--shadow)}article h1{font-size:32px;line-height:1.25;letter-spacing:-.6px;margin:0 0 25px}article h2{font-size:22px;margin:34px 0 12px;border-bottom:1px solid #f1f5f9;padding-bottom:8px}article h3{font-size:17px;margin:25px 0 8px}article p,article ul,article ol{margin:12px 0}article a{color:var(--accent);text-decoration:none}article a:hover{text-decoration:underline}article blockquote{margin:18px 0;padding:10px 16px;border-left:4px solid #93c5fd;background:#eff6ff;color:#334155;border-radius:0 8px 8px 0}article code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--code);padding:2px 5px;border-radius:5px;font-size:.92em}article pre{overflow:auto;background:#0f172a;color:#e2e8f0;padding:16px;border-radius:10px}article pre code{background:transparent;padding:0;color:inherit}article table{width:100%;border-collapse:collapse;margin:18px 0}article th,article td{text-align:left;border:1px solid var(--line);padding:9px 11px;vertical-align:top}article th{background:#f8fafc;font-weight:650}article hr{border:0;border-top:1px solid var(--line);margin:28px 0}.feedback{margin-top:18px;padding:16px 18px;border:1px solid var(--line);background:#fff;border-radius:12px;color:#64748b}.feedback a{color:var(--accent)}footer{text-align:center;color:#94a3b8;border-top:1px solid var(--line);padding:24px 16px 36px;font-size:13px}@media(max-width:980px){.topbar{padding:0 16px}.brand{min-width:auto}.brand-sub,.topnav{display:none}.search-wrap{margin-left:auto;width:min(260px,55vw)}.layout{grid-template-columns:1fr;padding:18px 16px 42px}aside{position:static;max-height:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;padding:0}.side-section{margin:0}.side-title{margin-bottom:5px}article{padding:28px 22px}.search-results{right:16px;width:calc(100vw - 32px)}}@media(max-width:560px){aside{display:block}.topbar{height:62px}.search-wrap{width:52vw}.brand a{font-size:21px}.layout{padding-top:12px}article h1{font-size:28px}}