:root{
  --indigo:#4f46e5; --indigo-dark:#4338ca; --ink:#0f172a; --body:#334155;
  --muted:#64748b; --faint:#94a3b8; --line:#e2e8f0; --hair:#f1f5f9;
  --bg:#ffffff; --panel:#f8fafc; --code-bg:#0f172a;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  color:var(--body);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--indigo);text-decoration:none}
a:hover{text-decoration:underline}

/* top nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line)}
.nav-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;gap:24px;
  padding:0 24px;height:62px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink);font-size:17px}
.brand .logo{width:28px;height:28px;border-radius:8px;
  background:linear-gradient(135deg,var(--indigo),#7c3aed);display:flex;align-items:center;
  justify-content:center;color:#fff;font-size:15px;font-weight:800}
.nav-links{display:flex;gap:4px;margin-left:auto;align-items:center}
.nav-links a{padding:7px 13px;border-radius:8px;color:var(--muted);font-size:14px;font-weight:500}
.nav-links a:hover{background:var(--hair);color:var(--ink);text-decoration:none}
.nav-links a.active{background:#eef2ff;color:var(--indigo)}
.nav .ver{font-size:12px;color:var(--faint);border:1px solid var(--line);
  padding:3px 9px;border-radius:999px}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--line);
  border-radius:8px;padding:6px 10px;cursor:pointer;font-size:18px}

/* layout */
.layout{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:250px 1fr;
  gap:48px;padding:0 24px}
.side{position:sticky;top:62px;align-self:start;height:calc(100vh - 62px);overflow-y:auto;
  padding:28px 0 60px}
.side h4{font-size:11px;text-transform:uppercase;letter-spacing:.07em;color:var(--faint);
  margin:0 0 12px}
.side ul{list-style:none;margin:0;padding:0}
.side a{display:block;padding:5px 12px;border-left:2px solid transparent;color:var(--muted);
  font-size:13.5px;border-radius:0 6px 6px 0}
.side a:hover{color:var(--ink);text-decoration:none;background:var(--hair)}
.side a.h3{padding-left:24px;font-size:13px}
.side a.active{color:var(--indigo);border-left-color:var(--indigo);background:#eef2ff;font-weight:500}

/* content */
.content{min-width:0;padding:40px 0 80px;max-width:820px}
.doc-actions{display:flex;justify-content:flex-end;margin:0 0 -8px}
.dl{display:inline-flex;align-items:center;gap:7px;background:#eef2ff;color:var(--indigo);
  font-weight:600;font-size:13px;padding:8px 15px;border-radius:9px}
.dl:hover{background:#e0e7ff;text-decoration:none}
.doc-title{font-size:34px;line-height:1.15;color:var(--ink);font-weight:800;margin:0 0 10px;
  letter-spacing:-.02em}
.doc-lead{font-size:17px;color:var(--muted);margin:0 0 36px;line-height:1.6}
.content h2{font-size:23px;color:var(--ink);font-weight:700;margin:48px 0 14px;
  padding-top:14px;letter-spacing:-.01em}
.content h3{font-size:17px;color:var(--ink);font-weight:650;margin:30px 0 10px}
.content p{margin:0 0 16px}
.content ul,.content ol{margin:0 0 16px;padding-left:22px}
.content li{margin:6px 0}
.content ul.cols{columns:2;column-gap:32px}
.content code{background:#eef2ff;color:#4338ca;padding:1.5px 6px;border-radius:5px;
  font-family:'JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;font-size:.86em}
.content pre{background:var(--code-bg);border-radius:12px;padding:18px 20px;overflow-x:auto;
  margin:0 0 20px;border:1px solid #1e293b}
.content pre code{background:none;color:#e2e8f0;padding:0;font-size:13px;line-height:1.65}
.content table{width:100%;border-collapse:collapse;margin:0 0 22px;font-size:14.5px}
.content th{text-align:left;background:var(--panel);color:var(--ink);font-weight:600;
  padding:10px 14px;border-bottom:2px solid var(--line)}
.content td{padding:10px 14px;border-bottom:1px solid var(--hair);vertical-align:top}
.content tr:last-child td{border-bottom:none}
ol.steps{counter-reset:step;list-style:none;padding-left:0}
ol.steps>li{position:relative;padding-left:42px;margin:14px 0;min-height:28px}
ol.steps>li::before{counter-increment:step;content:counter(step);position:absolute;left:0;top:-2px;
  width:28px;height:28px;border-radius:8px;background:#eef2ff;color:var(--indigo);font-weight:700;
  font-size:14px;display:flex;align-items:center;justify-content:center}
.callout{border-radius:10px;padding:14px 16px 14px 18px;margin:0 0 20px;font-size:14.5px;
  border-left:4px solid;line-height:1.6}
.callout strong{font-weight:650}
.callout.info{background:#eef2ff;border-color:var(--indigo);color:#3730a3}
.callout.warn{background:#fffbeb;border-color:#f59e0b;color:#92400e}
.callout.success{background:#ecfdf5;border-color:#10b981;color:#065f46}
.callout.danger{background:#fef2f2;border-color:#ef4444;color:#991b1b}
.callout code{background:rgba(255,255,255,.6)}

/* landing */
.home{max-width:1080px;margin:0 auto;padding:0 24px}
.hero{text-align:center;padding:72px 0 48px}
.hero-badge{display:inline-block;background:#eef2ff;color:var(--indigo);font-size:13px;
  font-weight:600;padding:5px 14px;border-radius:999px;margin-bottom:20px}
.hero h1{font-size:48px;line-height:1.08;color:var(--ink);font-weight:800;margin:0 0 16px;
  letter-spacing:-.03em}
.hero-sub{font-size:19px;color:var(--muted);max-width:620px;margin:0 auto 30px}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn-primary-lg{background:var(--indigo);color:#fff;padding:12px 24px;border-radius:10px;
  font-weight:600;font-size:15px}
.btn-primary-lg:hover{background:var(--indigo-dark);text-decoration:none}
.btn-ghost-lg{background:#fff;color:var(--ink);padding:12px 24px;border-radius:10px;
  font-weight:600;font-size:15px;border:1px solid var(--line)}
.btn-ghost-lg:hover{background:var(--panel);text-decoration:none}
.guide-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:24px 0 64px}
.guide-card{display:block;background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:26px;transition:.2s;color:inherit}
.guide-card:hover{text-decoration:none;box-shadow:0 12px 32px rgba(15,23,42,.08);
  transform:translateY(-3px);border-color:#c7d2fe}
.guide-icon{width:46px;height:46px;border-radius:12px;background:#eef2ff no-repeat center;
  background-size:24px;margin-bottom:16px}
.icon-user{background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%234f46e5' stroke-width='2'><path stroke-linecap='round' stroke-linejoin='round' d='M16 7a4 4 0 11-8 0 4 4 0 018 0zM12 14a7 7 0 00-7 7h14a7 7 0 00-7-7z'/></svg>")}
.icon-server{background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%234f46e5' stroke-width='2'><path stroke-linecap='round' stroke-linejoin='round' d='M5 12a2 2 0 01-2-2V6a2 2 0 012-2h14a2 2 0 012 2v4a2 2 0 01-2 2M5 12a2 2 0 00-2 2v4a2 2 0 002 2h14a2 2 0 002-2v-4a2 2 0 00-2-2M5 12h14M8 8h.01M8 16h.01'/></svg>")}
.icon-code{background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%234f46e5' stroke-width='2'><path stroke-linecap='round' stroke-linejoin='round' d='M10 20l4-16m4 4l4 4-4 4M6 16l-4-4 4-4'/></svg>")}
.guide-card h3{font-size:19px;color:var(--ink);margin:0 0 8px;font-weight:700}
.guide-card p{color:var(--muted);font-size:14.5px;margin:0 0 14px}
.guide-link{color:var(--indigo);font-weight:600;font-size:14px}
.overview{padding:0 0 72px}
.overview h2{font-size:26px;color:var(--ink);font-weight:700;margin:40px 0 16px}
.overview>p{font-size:16px;color:var(--body);max-width:760px}
.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;margin-top:8px}
.module-chip{border:1px solid var(--line);border-radius:12px;padding:14px 16px;background:#fff}
.module-chip strong{display:block;color:var(--ink);font-size:14.5px}
.module-chip span{color:var(--faint);font-size:12.5px}

footer{border-top:1px solid var(--line);margin-top:40px}
.foot-inner{max-width:1200px;margin:0 auto;padding:28px 24px;color:var(--faint);font-size:13px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

@media(max-width:880px){
  .layout{grid-template-columns:1fr;gap:0}
  .side{display:none;position:fixed;top:62px;left:0;right:0;bottom:0;height:auto;background:#fff;
    z-index:40;padding:24px;border-bottom:1px solid var(--line)}
  .side.open{display:block}
  .menu-btn{display:block}
  .nav-links{display:none}
  .guide-cards{grid-template-columns:1fr}
  .hero h1{font-size:34px}
  .content ul.cols{columns:1}
}