:root{
  --bg:#f2f5fb; --surface:#ffffff; --ink:#1c2233; --muted:#5b6474;
  --line:#e2e8f3; --chip-bg:#eef2fb; --note-bg:rgba(31,91,216,.06);
  --row-bg:#f8fafd; --code-bg:#0f172a; --brand:#1f5bd8; --brand-2:#0ea56a;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased}

/* ---------- header / nav ---------- */
.site-head{position:sticky;top:0;z-index:60;background:color-mix(in srgb, var(--surface) 88%, transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.head-inner{max-width:1300px;margin:0 auto;padding:0 20px;height:58px;display:flex;align-items:center;gap:14px}
.brand{font-weight:800;font-size:16px;color:var(--brand);text-decoration:none;letter-spacing:.2px;white-space:nowrap}
.site-nav{display:flex;gap:4px;margin-left:auto;align-items:center}
.nav-link{padding:7px 12px;border-radius:8px;color:var(--muted);text-decoration:none;font-size:14px;font-weight:600;white-space:nowrap}
.nav-link:hover{background:var(--chip-bg);color:var(--ink)}
.nav-link.active{color:var(--brand);background:var(--chip-bg)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;color:var(--ink);font-size:18px;width:38px;height:38px;cursor:pointer;margin-left:auto}

/* ---------- layout ---------- */
.layout{max-width:1300px;margin:0 auto;padding:22px 20px 36px;display:grid;grid-template-columns:248px minmax(0,1fr);gap:22px;align-items:start}
.layout.no-side{grid-template-columns:minmax(0,1fr)}
.sidebar{position:sticky;top:76px;max-height:calc(100vh - 96px);overflow:auto;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:13px 10px}
.side-title{font-size:11.5px;font-weight:800;letter-spacing:1px;color:var(--muted);margin:2px 6px 8px}
.side-nav{display:flex;flex-direction:column;gap:1px}
.toc-h2,.toc-h3{display:flex;gap:7px;align-items:baseline;text-decoration:none;color:var(--ink);padding:5px 6px;border-radius:7px;font-size:13px;line-height:1.4}
.toc-h2{font-weight:700}
.toc-h3{padding-left:20px;font-size:12.5px;color:var(--muted)}
.toc-h2:hover,.toc-h3:hover{background:var(--chip-bg);color:var(--brand)}
.toc-dot{width:5px;height:5px;border-radius:50%;background:var(--line);flex:none;margin-top:.62em}

.article{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:28px 30px;min-width:0}
.page-title{border-bottom:1px dashed var(--line);padding-bottom:14px;margin-bottom:16px}
.page-title h1{margin:0;font-size:23px;line-height:1.35}
.page-title p{margin:8px 0 0;color:var(--muted);font-size:14px}

/* ---------- doc typography ---------- */
.doc-body h2{font-size:20px;margin:34px 0 10px;padding-bottom:7px;border-bottom:1px solid var(--line);scroll-margin-top:78px}
.doc-body h3{font-size:16.5px;margin:24px 0 8px;scroll-margin-top:78px}
.doc-body h4{font-size:14.5px;margin:18px 0 6px;scroll-margin-top:78px}
.doc-body p{margin:10px 0;font-size:14.5px;line-height:1.8}
.doc-body ul,.doc-body ol{margin:10px 0;padding-left:24px}
.doc-body li{margin:5px 0;line-height:1.75;font-size:14.5px}
.doc-body li>ul,.doc-body li>ol{margin:4px 0}
.doc-body code{background:var(--chip-bg);border:1px solid var(--line);border-radius:5px;padding:1.5px 6px;font-family:ui-monospace,Consolas,"Cascadia Mono",monospace;font-size:12.8px;color:var(--brand)}
.doc-body pre{background:var(--code-bg);color:#dbe6fb;border-radius:10px;padding:14px 16px;overflow-x:auto;line-height:1.6;font-size:13px}
.doc-body pre code{background:none;border:none;padding:0;color:inherit;font-size:13px}
.tblwrap{overflow-x:auto;margin:14px 0;border:1px solid var(--line);border-radius:10px}
.doc-body table{border-collapse:collapse;width:100%;font-size:13.5px;min-width:520px;background:var(--surface)}
.doc-body th,.doc-body td{border-bottom:1px solid var(--line);border-right:1px solid var(--line);padding:8px 11px;text-align:left;vertical-align:top}
.doc-body th{background:var(--chip-bg);font-weight:700;color:var(--ink)}
.doc-body tr:last-child td{border-bottom:none}
.doc-body td:last-child,.doc-body th:last-child{border-right:none}
.doc-body tr:nth-child(even) td{background:var(--row-bg)}
.doc-body blockquote{margin:14px 0;padding:10px 14px;border-left:3px solid var(--brand);background:var(--note-bg);border-radius:0 8px 8px 0;color:var(--muted)}
.doc-body blockquote p{margin:4px 0}
.doc-body blockquote strong{color:var(--ink)}
.doc-body hr{border:none;border-top:1px solid var(--line);margin:26px 0}
.doc-body a{color:var(--brand);text-decoration:none;border-bottom:1px solid color-mix(in srgb,var(--brand) 35%, transparent)}
.doc-body a:hover{color:var(--brand);border-bottom-color:var(--brand)}
.page-foot{margin-top:28px;padding-top:14px;border-top:1px solid var(--line);font-size:12.5px;color:var(--muted)}
.site-foot{text-align:center;padding:22px 16px 30px;font-size:12.5px;color:var(--muted)}

/* ---------- embed pages ---------- */
body.embed-page .layout{padding-top:18px}
body.embed-page .article{background:transparent;border:none;border-radius:0;padding:0}
body.embed-page .page-title{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px 22px;margin-bottom:18px}
body.embed-page .page-title h1{font-size:20px}
.embed-host .ml-wrap,.embed-host .aeco-wrap{max-width:1180px;margin:0 auto}
body.embed-page .page-foot{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px 18px;margin-top:18px}

/* ---------- home ---------- */
.home{max-width:1080px;margin:0 auto;padding:26px 20px 40px}
.hero{padding:44px 8px 26px;text-align:center}
.hero-kicker{display:inline-block;font-size:12.5px;font-weight:700;color:var(--brand);background:var(--note-bg);border:1px solid color-mix(in srgb,var(--brand) 25%, transparent);padding:5px 14px;border-radius:999px;margin:0 0 18px}
.hero h1{margin:0 0 14px;font-size:34px;line-height:1.35;letter-spacing:.3px}
.hero-sub{margin:0 auto 24px;max-width:680px;color:var(--muted);font-size:15.5px}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:10px 20px;border-radius:10px;font-size:14.5px;font-weight:700;text-decoration:none}
.btn.primary{background:var(--brand);color:#fff}
.btn.primary:hover{filter:brightness(1.08)}
.btn.ghost{border:1px solid var(--line);color:var(--ink);background:var(--surface)}
.btn.ghost:hover{border-color:var(--brand);color:var(--brand)}
.home-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px;margin:26px 0}
.home-card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:20px 20px 18px;text-decoration:none;color:inherit;transition:.18s;box-shadow:0 1px 2px rgba(16,30,60,.04)}
.home-card:hover{transform:translateY(-3px);border-color:var(--brand);box-shadow:0 10px 24px rgba(31,91,216,.12)}
.home-card-head{display:flex;align-items:center;gap:10px}
.home-icon{font-size:26px}
.home-card-head h2{margin:0;font-size:18px;color:var(--ink)}
.home-go{margin-left:auto;color:var(--brand);font-weight:800;font-size:18px}
.home-card p{margin:10px 0 12px;color:var(--muted);font-size:13.8px;line-height:1.7}
.home-tags{display:flex;flex-wrap:wrap;gap:6px}
.home-tag{font-size:11.5px;font-weight:600;color:var(--brand);background:var(--note-bg);border:1px solid color-mix(in srgb,var(--brand) 20%, transparent);padding:2px 10px;border-radius:999px}
.home-note{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px 26px;margin-top:8px}
.home-note h2{margin:0 0 10px;font-size:18px}
.howto{margin:0;padding-left:22px}
.howto li{margin:9px 0;font-size:14.5px;color:var(--muted);line-height:1.75}
.howto b{color:var(--ink)}

/* ---------- dark theme ---------- */
body.dark{
  --bg:#0d1220; --surface:#151b2b; --surface2:#171e31; --ink:#e8ecf6; --muted:#9aa6bf;
  --line:#242e49; --chip-bg:#1d2740; --note-bg:rgba(59,130,246,.09); --row-bg:#1a2134;
  --code-bg:#0a0f1c; --brand:#6ea8fe; --brand-2:#34d399;
}
body.dark .home-tag{background:rgba(110,168,254,.1);border-color:rgba(110,168,254,.3)}
body.dark .hero h1{color:#fff}

/* ---------- responsive ---------- */
@media (max-width: 920px){
  .layout{grid-template-columns:minmax(0,1fr)}
  .sidebar{display:none}
  .article{overflow-x:hidden}
  .doc-body table{min-width:0}
  .doc-body code{word-break:break-word}
  .site-nav{display:none;position:absolute;top:58px;left:0;right:0;flex-direction:column;background:var(--surface);border-bottom:1px solid var(--line);padding:10px 16px;gap:2px;box-shadow:0 12px 20px rgba(16,30,60,.08)}
  .site-nav.open{display:flex}
  .nav-toggle{display:inline-flex;align-items:center;justify-content:center}
  .article{padding:20px 18px;border-radius:12px}
  .hero h1{font-size:26px}
  .head-inner{padding:0 16px}
  .page-title h1{font-size:19px}
}
@media (max-width: 560px){
  .brand{font-size:14px}
  .hero{padding:28px 4px 18px}
  .home{padding:16px 14px 30px}
}