:root{
  --blue:#3964fe;
  --blue-dark:#2f57e9;
  --blue-50:#edf3fe;
  --text:#0f1115;
  --text-2:#43454a;
  --muted:#5c6370;
  --muted-2:#8a8f98;
  --border:#e1e5ee;
  --sidebar:#f9fafb;
  --surface:#fff;
  --surface-muted:#f5f6f7;
  --code-bg:#0f1115;
  --code-fg:#e9ecf2;
  --inline-bg:rgba(30,41,59,.07);
  --radius:8px;
  --radius-lg:12px;
  --nav-h:56px;
  --tabs-h:44px;
  --sidebar-w:300px;
  --toc-w:220px;
  --content-w:800px;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:120px}
body{
  margin:0;background:var(--surface);color:var(--text);
  font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased;
}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
code,kbd{font-family:var(--mono)}

/* navbar */
.navbar{
  position:sticky;top:0;z-index:60;height:var(--nav-h);background:#fff;
  border-bottom:1px solid var(--border);
}
.navbar-inner{max-width:1600px;height:100%;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:9px;color:var(--text);font-size:16px;font-weight:650;letter-spacing:-.01em}
.brand:hover{text-decoration:none}
.brand-logo{width:26px;height:26px;border-radius:7px;background:linear-gradient(135deg,#3964fe,#6ea8fe);display:grid;place-items:center;color:#fff;font-size:14px;font-weight:800}
.nav-right{display:flex;align-items:center;gap:6px}
.nav-link{color:var(--text-2);font-size:14px;padding:6px 12px;border-radius:6px}
.nav-link:hover{background:var(--surface-muted);text-decoration:none;color:var(--text)}
.nav-link.active{color:var(--blue)}
.nav-btn{background:var(--blue);color:#fff;font-size:14px;font-weight:500;padding:7px 14px;border-radius:6px;margin-left:6px}
.nav-btn:hover{background:var(--blue-dark);text-decoration:none;color:#fff}

/* section tabs */
.section-tabs{position:sticky;top:var(--nav-h);z-index:55;height:var(--tabs-h);background:#fff;border-bottom:1px solid var(--border)}
.section-tabs-inner{max-width:1600px;height:100%;margin:0 auto;padding:0 24px;display:flex;align-items:stretch;gap:28px}
.section-tab{display:flex;align-items:center;color:var(--muted);font-size:14px;border-bottom:2px solid transparent;margin-bottom:-1px}
.section-tab:hover{color:var(--text);text-decoration:none}
.section-tab.active{color:var(--blue);border-bottom-color:var(--blue)}

/* shell */
.docs-shell{display:flex;max-width:1600px;margin:0 auto;min-height:calc(100vh - var(--nav-h) - var(--tabs-h))}
.sidebar{width:var(--sidebar-w);flex:none;background:var(--sidebar);border-right:1px solid var(--border)}
.sidebar-inner{position:sticky;top:calc(var(--nav-h) + var(--tabs-h));max-height:calc(100vh - var(--nav-h) - var(--tabs-h));overflow-y:auto;padding:20px 14px 40px}
.sidebar::-webkit-scrollbar,.sidebar-inner::-webkit-scrollbar{width:6px}
.sidebar-inner::-webkit-scrollbar-thumb{background:#d8dce5;border-radius:3px}
.menu-group{font-size:12px;font-weight:600;letter-spacing:.04em;color:var(--muted-2);margin:18px 10px 6px}
.menu-group:first-child{margin-top:2px}
.menu-link{display:block;padding:6px 10px;margin:1px 0;border-radius:6px;color:var(--text-2);font-size:14px;line-height:1.45}
.menu-link:hover{background:#eef1f6;color:var(--text);text-decoration:none}
.menu-link.active{background:var(--blue-50);color:var(--blue);font-weight:500}
.menu-sub{padding-left:22px;font-size:13.5px}

.doc-main{flex:1;min-width:0;padding:36px 48px 96px}
.doc-content{max-width:var(--content-w);margin:0 auto}
.toc{width:var(--toc-w);flex:none;padding:40px 16px}
.toc-inner{position:sticky;top:calc(var(--nav-h) + var(--tabs-h) + 24px);max-height:calc(100vh - 140px);overflow:auto}
.toc-title{font-size:12px;font-weight:600;color:var(--muted-2);margin:0 0 8px 10px;letter-spacing:.04em}
.toc a{display:block;font-size:13px;color:var(--muted);border-left:2px solid transparent;padding:4px 0 4px 12px;line-height:1.5}
.toc a:hover{color:var(--text);text-decoration:none}
.toc a.active{color:var(--blue);border-left-color:var(--blue)}

/* typography */
h1{font-size:1.75rem;line-height:1.35;letter-spacing:-.02em;font-weight:700;margin:0 0 14px}
h2{font-size:1.5rem;line-height:1.4;letter-spacing:-.01em;font-weight:650;margin:44px 0 14px}
h3{font-size:1.25rem;line-height:1.45;font-weight:650;margin:30px 0 10px}
h4{font-size:1.125rem;font-weight:600;margin:24px 0 8px}
p{margin:0 0 14px;color:var(--text-2)}
ul,ol{margin:0 0 16px;padding-left:22px;color:var(--text-2)}
li{margin:5px 0}
strong{color:var(--text);font-weight:600}
hr{border:0;border-top:1px solid var(--border);margin:36px 0}
.lead{font-size:16px;color:var(--muted)}

/* inline code */
.inline-code{background:var(--inline-bg);color:#1b1b1c;border-radius:4px;padding:2px 5px;font-size:13px;font-family:var(--mono);word-break:break-word}

/* code blocks */
.code-block{border:1px solid #2c2c2e;border-radius:var(--radius);overflow:hidden;background:var(--code-bg);margin:16px 0 20px;box-shadow:0 1px 2px rgba(15,17,21,.06)}
.code-head{display:flex;align-items:center;justify-content:space-between;padding:7px 12px;border-bottom:1px solid rgba(255,255,255,.08);color:#979da6;font-size:12px}
.code-head .lang{font-family:var(--mono);letter-spacing:.02em}
.copy-btn{background:transparent;border:1px solid rgba(255,255,255,.14);color:#b6bcc7;font-size:11.5px;padding:3px 9px;border-radius:5px;cursor:pointer;transition:all .15s}
.copy-btn:hover{color:#fff;border-color:rgba(255,255,255,.35)}
.code-block pre{margin:0;padding:16px 18px;overflow-x:auto;font-size:13.5px;line-height:1.7;color:var(--code-fg)}
.code-block code{font-family:var(--mono)}
.tok-c{color:#7d8590}
.tok-k{color:#ff7b72}
.tok-s{color:#a5d6ff}
.tok-n{color:#79c0ff}
.tok-p{color:#e6edf3}

/* tabs inside code */
.tabs{display:flex;gap:2px;padding:6px 8px 0;border-bottom:1px solid rgba(255,255,255,.08);background:#14161b}
.tab{background:transparent;border:0;color:#979da6;font-size:12.5px;padding:6px 12px;border-radius:6px 6px 0 0;cursor:pointer;border-bottom:2px solid transparent}
.tab:hover{color:#d5dae2}
.tab.active{color:#fff;border-bottom-color:var(--blue);background:rgba(255,255,255,.04)}
.tab-pane{display:none}
.tab-pane.active{display:block}

/* tables */
.table-wrap{overflow-x:auto;margin:18px 0 22px;border:1px solid var(--border);border-radius:var(--radius)}
table{width:100%;border-collapse:collapse;font-size:.9375rem;min-width:520px}
th{background:var(--sidebar);color:var(--text-2);font-weight:600;font-size:13px;text-align:left;padding:9px 14px;border-bottom:1px solid var(--border);white-space:nowrap}
td{padding:9px 14px;border-bottom:1px solid var(--border);color:var(--text-2);vertical-align:top}
tr:last-child td{border-bottom:0}
td code{font-family:var(--mono);font-size:13px;color:var(--text)}
tbody tr:hover{background:#fafbfc}

/* callout */
.callout{display:flex;gap:10px;background:var(--blue-50);border-left:3px solid var(--blue);border-radius:6px;padding:12px 16px;margin:18px 0;font-size:14px;color:#243a6b}
.callout.warn{background:#fff8ec;border-left-color:#f59e0b;color:#6b4a12}
.callout .ico{flex:none;font-weight:700}

/* cards */
.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:18px 0 26px}
.card{border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;background:#fff;transition:border-color .15s,box-shadow .15s}
.card:hover{border-color:#c9d4ea;box-shadow:0 2px 8px rgba(15,17,21,.05);text-decoration:none}
.card h3{margin:0 0 6px;font-size:16px;color:var(--text)}
.card p{margin:0;font-size:14px;color:var(--muted)}

/* badges */
.badge{display:inline-block;font-size:12px;line-height:1;padding:4px 8px;border-radius:999px;background:var(--blue-50);color:var(--blue);font-weight:500;vertical-align:middle}
.badge.gray{background:var(--surface-muted);color:var(--muted)}
.badge.green{background:#e6faed;color:#15803d}
.badge.orange{background:#fff4e5;color:#b45309}

/* details faq */
details.faq{border:1px solid var(--border);border-radius:var(--radius);margin:0 0 10px;background:#fff}
details.faq summary{padding:13px 16px;cursor:pointer;font-size:14.5px;font-weight:500;color:var(--text);list-style:none;display:flex;justify-content:space-between;align-items:center}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";color:var(--muted-2);font-size:18px;font-weight:400}
details.faq[open] summary::after{content:"−"}
details.faq .faq-body{padding:0 16px 14px;color:var(--text-2);font-size:14px}
details.faq .faq-body p{margin:0 0 8px}
details.faq .faq-body p:last-child{margin:0}

/* next links */
.next-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:26px}
.next-card{display:block;border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px}
.next-card:hover{border-color:#c9d4ea;text-decoration:none}
.next-card .label{font-size:12px;color:var(--muted-2);margin-bottom:4px}
.next-card .title{font-size:15px;font-weight:600;color:var(--text)}

/* footer */
.site-footer{border-top:1px solid var(--border);background:#fff;padding:28px 0 36px;margin-top:20px}
.footer-inner{max-width:1600px;margin:0 auto;padding:0 24px;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.footer-note{color:var(--muted-2);font-size:13px}
.footer-links{display:flex;gap:22px;flex-wrap:wrap}
.footer-links a{color:var(--muted);font-size:13px}
.footer-links a:hover{color:var(--text)}

/* mobile toc */
.mobile-toc{display:none;border:1px solid var(--border);border-radius:var(--radius);padding:0 14px;margin-bottom:24px;background:#fff}
.mobile-toc summary{cursor:pointer;padding:11px 0;font-size:14px;font-weight:600;list-style:none}
.mobile-toc summary::-webkit-details-marker{display:none}
.mobile-toc .mobile-links{display:flex;flex-wrap:wrap;gap:8px;padding:0 0 12px}
.mobile-toc .mobile-links a{font-size:13px;padding:4px 10px;border:1px solid var(--border);border-radius:999px;color:var(--text-2)}

/* responsive */
@media(max-width:1280px){
  .toc{display:none}
}
@media(max-width:996px){
  .docs-shell{display:block}
  .sidebar{display:none}
  .doc-main{padding:28px 20px 64px}
  .mobile-toc{display:block}
  .section-tabs-inner{padding:0 20px;gap:18px}
  .navbar-inner{padding:0 20px}
  .nav-link{display:none}
  h1{font-size:1.6rem}
  h2{font-size:1.35rem;margin-top:36px}
  .card-grid,.next-links{grid-template-columns:1fr}
  .footer-inner{padding:0 20px}
}