:root{--bg:#fff;--side:#fafbfc;--text:#1f2328;--muted:#6b7280;--border:#e6e8eb;
--accent:#0e8f6f;--accent-soft:#e7f6f0;--code-bg:#f6f7f9;--shadow:0 8px 28px rgba(20,30,40,.12)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:15px/1.72 -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,"PingFang SC","Helvetica Neue",Arial,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.layout{display:grid;grid-template-columns:290px minmax(0,1fr) 210px;min-height:100vh}
.sidebar{position:sticky;top:0;height:100vh;overflow-y:auto;background:var(--side);border-right:1px solid var(--border);padding:20px 14px 40px}
.brand{display:flex;align-items:center;gap:10px;padding:4px 10px 18px;font-weight:700;font-size:16px;letter-spacing:-.2px}
.brand .dot{width:26px;height:26px;border-radius:7px;background:linear-gradient(135deg,#12b886,#0e8f6f);display:inline-block;flex:none;overflow:hidden}
.brand .dot img{width:100%;height:100%;object-fit:cover;display:block}
.brand small{display:block;font-size:11px;font-weight:500;color:var(--muted);letter-spacing:.04em}
.search-wrap{position:relative;margin:0 6px 18px}
#search{width:100%;padding:9px 12px;border:1px solid var(--border);border-radius:9px;background:#fff;font-size:13px;outline:none;color:var(--text)}
#search:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
#search-results{position:absolute;z-index:30;top:44px;left:0;right:0;background:#fff;border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow);max-height:360px;overflow:auto;display:none}
#search-results.show{display:block}
.sr-item{display:block;padding:9px 12px;border-bottom:1px solid #f1f2f4;font-size:13px;color:var(--text)}
.sr-item:hover{background:var(--accent-soft);text-decoration:none}
.sr-item b{display:block;font-weight:600}
.sr-item span{color:var(--muted);font-size:11px}
.sr-snip{color:var(--muted);font-size:11px;line-height:1.45;margin-top:3px;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.sr-empty{padding:12px;color:var(--muted);font-size:13px}
.nav-section{margin-bottom:14px}
summary{list-style:none;cursor:pointer}
summary::-webkit-details-marker{display:none}
.nav-section-title{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);padding:8px 10px;display:flex;justify-content:space-between;align-items:center}
.chev{width:6px;height:6px;border-right:1.6px solid #9aa1aa;border-bottom:1.6px solid #9aa1aa;transform:rotate(45deg);transition:transform .15s;flex:none;margin-left:6px}
details[open]>summary .chev{transform:rotate(-135deg)}
.nav-root ul,.nav-section ul{list-style:none;margin:0;padding:0}
.nav-section>details>ul{padding-left:4px}
.nav-item{margin:1px 0}
.nav-link{display:block;padding:5px 10px;border-radius:7px;color:#3d444d;font-size:13.2px;line-height:1.45}
.nav-link:hover{background:#eef0f2;text-decoration:none;color:var(--text)}
.nav-link.active{background:var(--accent-soft);color:var(--accent);font-weight:600}
.nav-branch summary{display:flex;align-items:center;justify-content:space-between;padding:5px 10px;border-radius:7px}
.nav-branch summary:hover{background:#eef0f2}
.nav-branch summary .nav-link,.nav-branch summary .nav-group{flex:1;padding:0;background:none!important;font-size:13.2px}
.nav-group{font-weight:600;color:#3d444d;font-size:13.2px}
.nav-branch>details>ul{padding-left:12px;border-left:1px solid var(--border);margin-left:16px}
.side-foot{padding:18px 10px 0;font-size:11px;color:var(--muted);border-top:1px solid var(--border);margin-top:18px;line-height:1.6}
.main-wrap{min-width:0;display:flex;flex-direction:column}
.topbar{height:56px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:14px;padding:0 28px;position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);z-index:10}
.breadcrumb{font-size:12.5px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}
.breadcrumb span{margin:0 6px;color:#c2c7cd}
.origin{font-size:12px;color:var(--muted);white-space:nowrap}
#menu-btn{display:none;background:none;border:1px solid var(--border);border-radius:7px;padding:5px 9px;cursor:pointer;font-size:16px;color:var(--text)}
.content{max-width:830px;margin:0 auto;padding:38px 44px 60px;width:100%}
.content h1{font-size:32px;line-height:1.28;letter-spacing:-.6px;margin:0 0 22px;font-weight:700}
.content h2{font-size:23px;letter-spacing:-.3px;margin:38px 0 14px;padding-top:8px;font-weight:680}
.content h3{font-size:18px;margin:28px 0 12px;font-weight:650}
.content h4{font-size:15.5px;margin:22px 0 10px}
.content p{margin:0 0 15px}
.content ul,.content ol{padding-left:26px;margin:0 0 16px}
.content li{margin:4px 0}
.content li>ul,.content li>ol{margin-top:4px}
.content hr{border:0;border-top:1px solid var(--border);margin:30px 0}
.content img{max-width:100%;height:auto;border-radius:8px;border:1px solid var(--border)}
.content figure{margin:18px 0}
.content figcaption{font-size:12.5px;color:var(--muted);text-align:center;margin-top:6px}
.content table{border-collapse:collapse;width:100%;margin:18px 0;font-size:14px;display:block;overflow-x:auto}
.content th,.content td{border:1px solid var(--border);padding:9px 12px;text-align:left}
.content th{background:var(--code-bg);font-weight:650}
.content tr:nth-child(even) td{background:#fcfcfd}
.content pre{background:var(--code-bg);border:1px solid var(--border);border-radius:9px;padding:14px 16px;overflow-x:auto;font-size:13px;line-height:1.6;margin:16px 0}
.content code{font:13px/1.6 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--code-bg);padding:2px 5px;border-radius:5px}
.content pre code{background:none;padding:0;font-size:13px}
.content blockquote{border-left:3px solid var(--accent);background:#f7fbf9;margin:16px 0;padding:10px 16px;color:#3d444d;border-radius:0 8px 8px 0}
.content blockquote p:last-child{margin:0}
.content details{border:1px solid var(--border);border-radius:9px;padding:10px 14px;margin:14px 0}
.content summary{font-weight:600}
.content video,.content iframe{max-width:100%;border-radius:8px}
.hub-guide{margin:0 0 28px;padding:18px 20px;border:1px solid var(--border);border-radius:12px;background:linear-gradient(135deg,#f7fbf9,#fff)}
.hub-guide h2{font-size:19px;margin:0 0 8px;padding:0}.hub-guide p{color:#4b5563;margin-bottom:12px}
.hub-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.hub-links a{padding:9px 11px;border:1px solid var(--border);border-radius:8px;background:#fff;font-size:13px}
.hub-links a:hover{border-color:var(--accent);text-decoration:none;background:var(--accent-soft)}
.page-provenance{max-width:830px;margin:0 auto 18px;padding:12px 44px;color:var(--muted);font-size:11.5px;border-top:1px solid var(--border);line-height:1.65}
.page-provenance a{word-break:break-word}
.embed-note{font-size:12px;color:var(--muted);border:1px dashed var(--border);padding:8px 12px;border-radius:8px;display:inline-block}
.pager{max-width:830px;margin:0 auto;padding:0 44px 30px;display:flex;gap:12px;width:100%}
.pager a{flex:1;border:1px solid var(--border);border-radius:10px;padding:12px 16px;font-size:13px;color:var(--text)}
.pager a:hover{border-color:var(--accent);background:var(--accent-soft);text-decoration:none}
.pager small{display:block;color:var(--muted);font-size:11px;margin-bottom:3px}
.pager .next{text-align:right}
.page-foot{max-width:830px;margin:0 auto;padding:0 44px 60px;font-size:12px;color:var(--muted);width:100%}
.toc{position:sticky;top:0;height:100vh;overflow-y:auto;padding:70px 20px 40px;border-left:1px solid var(--border);font-size:12.5px}
.toc-title{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:10px}
.toc a{display:block;color:var(--muted);padding:4px 0;line-height:1.45}
.toc a:hover{color:var(--accent)}
.toc a.l3{padding-left:12px;font-size:12px}
@media(max-width:1180px){.layout{grid-template-columns:290px minmax(0,1fr)}.toc{display:none}}
@media(max-width:860px){.layout{grid-template-columns:1fr}.sidebar{position:fixed;left:0;top:0;width:290px;z-index:40;transform:translateX(-100%);transition:transform .2s;box-shadow:var(--shadow)}body.nav-open .sidebar{transform:translateX(0)}#menu-btn{display:block}.content,.pager,.page-foot,.page-provenance{padding-left:20px;padding-right:20px}.topbar{padding:0 16px}.hub-links{grid-template-columns:1fr}}

.trans-notice{background:#fff9e6;border-bottom:1px solid #f2e3ae;color:#6b5410;font-size:12.5px;padding:7px 24px;text-align:center}
.trans-notice a{color:inherit;text-decoration:underline}
.lang-switch select{appearance:none;-webkit-appearance:none;border:1px solid var(--border);background:#fff url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="8" height="8"><path d="M1 2l3 3 3-3" fill="none" stroke="%239aa1aa" stroke-width="1.5"/></svg>') no-repeat right 8px center;border-radius:7px;padding:5px 24px 5px 10px;font-size:12px;color:var(--text);cursor:pointer}
.lang-switch select:hover{border-color:var(--accent)}
@media(max-width:860px){.trans-notice{padding:7px 14px}}