:root {
  /* enterprise minimal palette */
  --bg: #ffffff;
  --bg-subtle: #f8fafc;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-dim: #475569;
  --text-faint: #94a3b8;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-soft: #eff6ff;
  --green: #15803d;
  --green-soft: #f0fdf4;
  --amber: #b45309;
  --amber-soft: #fffbeb;
  --red: #b91c1c;
  --red-soft: #fef2f2;
  --code-bg: #f6f8fa;
  --code-border: #e2e8f0;
  --term-bg: #0b1220;
  --term-text: #dbe4f0;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --radius: 10px;
  --radius-sm: 6px;
  --container: 1160px;
  --header-h: 60px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.07);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.65;
  min-height: 100vh;
  display: flex; flex-direction: column;
  -webkit-font-smoothing: antialiased;
}
.main { flex: 1; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }
.container { max-width: var(--container); margin: 0 auto; padding: 0 28px; }
::selection { background: rgba(37, 99, 235, 0.15); }

/* ============ header ============ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); }
.brand-name { font-size: 17px; font-weight: 700; letter-spacing: -0.01em; }
.brand-logo { display: inline-flex; }
.main-nav { display: flex; align-items: center; gap: 2px; }
.nav-link {
  color: var(--text-dim); padding: 7px 12px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500; transition: color .12s, background .12s;
}
.nav-link:hover { color: var(--text); background: var(--surface-2); }
.nav-link.active { color: var(--text); font-weight: 600; }
.nav-cta {
  color: var(--text); border: 1px solid var(--border-strong); background: var(--surface);
  margin-left: 10px; font-weight: 600;
}
.nav-cta:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 20px; height: 2px; background: var(--text); border-radius: 1px; }

/* ============ hero ============ */
.hero {
  position: relative;
  padding: 88px 0 72px;
  background:
    radial-gradient(800px 360px at 12% -20%, rgba(37, 99, 235, 0.06), transparent 60%),
    var(--bg);
  border-bottom: 1px solid var(--border);
}
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.hero h1 {
  font-size: clamp(32px, 4.6vw, 46px);
  line-height: 1.15; letter-spacing: -0.025em; font-weight: 800; margin-bottom: 18px;
  color: var(--text);
}
.hero-sub { font-size: 18px; color: var(--text-dim); max-width: 540px; margin-bottom: 30px; }
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-meta { margin-top: 30px; display: flex; gap: 24px; color: var(--text-faint); font-size: 13.5px; flex-wrap: wrap; }
.hero-meta b { color: var(--text-dim); font-weight: 600; }

/* terminal (dark accent on light site, like Vercel/Stripe heroes) */
.terminal {
  background: var(--term-bg); border: 1px solid #1e293b; border-radius: 12px;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.18);
  overflow: hidden;
}
.terminal-bar {
  display: flex; align-items: center; gap: 7px; padding: 11px 16px;
  background: #0f1a2e; border-bottom: 1px solid #1e293b;
}
.terminal-bar .dot { width: 10px; height: 10px; border-radius: 50%; }
.terminal-bar .title { margin-left: 8px; font-family: var(--mono); font-size: 12px; color: #64748b; }
.terminal pre { padding: 18px 20px; font-size: 13px; line-height: 1.75; overflow-x: auto; color: var(--term-text); }
.terminal .cmd { color: #7dd3fc; }
.terminal .out { color: #94a3b8; }
.terminal .cmt { color: #475569; }
.cursor { display: inline-block; width: 7px; height: 14px; background: #7dd3fc; vertical-align: text-bottom; animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cursor { animation: none; }
}

/* ============ sections ============ */
.section { padding: 72px 0; }
.section-subtle { background: var(--bg-subtle); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { max-width: 720px; margin-bottom: 42px; }
.section-head .kicker {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.09em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 10px; font-weight: 600;
}
.section-head h2 { font-size: clamp(24px, 3vw, 32px); letter-spacing: -0.02em; margin-bottom: 12px; color: var(--text); }
.section-head p { color: var(--text-dim); font-size: 16px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; transition: border-color .15s, box-shadow .15s, transform .15s;
}
.card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card .fico { color: var(--accent); margin-bottom: 14px; display: block; }
.card h3 { font-size: 16px; margin-bottom: 8px; color: var(--text); }
.card p { color: var(--text-dim); font-size: 14px; }
.card a.card-link { font-size: 13.5px; font-weight: 600; margin-top: 12px; display: inline-block; }

/* badges */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 11.5px; color: var(--text-dim);
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 999px; padding: 4px 11px;
}
.badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.badge.green .dot { background: var(--green); }

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: var(--radius-sm); font-size: 14.5px; font-weight: 600;
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text);
  cursor: pointer; transition: background .12s, border-color .12s, color .12s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); color: #fff; }
.btn-ghost { background: transparent; border-color: transparent; }
.btn-lg { padding: 12px 22px; font-size: 15px; }

/* ============ page head (standalone pages) ============ */
.page-head { padding: 56px 0 26px; border-bottom: 1px solid var(--border); background: var(--bg-subtle); }
.page-head .kicker { font-family: var(--mono); font-size: 12px; letter-spacing: .09em; text-transform: uppercase; color: var(--accent); margin-bottom: 8px; font-weight: 600; }
.page-head h1 { font-size: clamp(28px, 3.6vw, 38px); letter-spacing: -0.02em; margin-bottom: 10px; }
.page-head p { color: var(--text-dim); font-size: 16.5px; max-width: 720px; }
.page-body { padding: 44px 28px 76px; }
.prose { max-width: 780px; }
.prose h2 { font-size: 24px; margin: 42px 0 14px; letter-spacing: -0.015em; color: var(--text); }
.prose h3 { font-size: 18.5px; margin: 30px 0 10px; color: var(--text); }
.prose p { margin-bottom: 16px; color: var(--text-dim); }
.prose ul, .prose ol { margin: 0 0 18px 22px; color: var(--text-dim); }
.prose li { margin-bottom: 6px; }
.prose li::marker { color: var(--text-faint); }
.prose strong { color: var(--text); font-weight: 600; }
.prose code {
  font-family: var(--mono); font-size: 0.85em; background: var(--code-bg);
  border: 1px solid var(--code-border); border-radius: 5px; padding: 1.5px 6px; color: #1d39c4;
}
.prose a.src-link code { text-decoration: underline; text-underline-offset: 3px; }
.prose a.src-link:hover code { background: #eef2ff; }
.prose pre {
  background: var(--code-bg); border: 1px solid var(--code-border); border-radius: var(--radius);
  padding: 18px 20px; overflow-x: auto; margin: 18px 0 22px; position: relative;
}
.prose pre code { background: none; border: 0; padding: 0; color: #24292f; font-size: 13px; line-height: 1.7; }
.prose table { display: block; width: 100%; border-collapse: collapse; margin: 18px 0 24px; font-size: 14px; overflow-x: auto; }
.prose th { text-align: left; font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-faint); padding: 9px 12px; border-bottom: 1px solid var(--border-strong); }
.prose td { padding: 9px 12px; border-bottom: 1px solid var(--border); color: var(--text-dim); vertical-align: top; }
.prose tr:hover td { background: var(--bg-subtle); }
.prose blockquote { border-left: 3px solid var(--accent); padding: 4px 18px; margin: 18px 0; color: var(--text-dim); background: var(--accent-soft); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.prose img { max-width: 100%; border-radius: var(--radius); border: 1px solid var(--border); }
.prose .diagram { margin: 22px 0; }
.doc-lede { font-size: 17px; color: var(--text-dim); margin-bottom: 24px; }

/* callouts */
.callout { display: flex; gap: 12px; border-radius: var(--radius); padding: 14px 16px; margin: 20px 0; border: 1px solid var(--border); border-left-width: 3px; }
.callout p { margin: 0; font-size: 14px; }
.callout .co-title { font-weight: 600; font-size: 13px; text-transform: uppercase; letter-spacing: .04em; margin-bottom: 2px; display: block; }
.callout.info { background: var(--accent-soft); border-color: #bfdbfe; border-left-color: var(--accent); }
.callout.info .co-title { color: var(--accent-strong); }
.callout.note { background: var(--bg-subtle); border-color: var(--border-strong); border-left-color: var(--text-faint); }
.callout.note .co-title { color: var(--text-dim); }
.callout.warn { background: var(--red-soft); border-color: #fecaca; border-left-color: var(--red); }
.callout.warn .co-title { color: var(--red); }
.callout.success { background: var(--green-soft); border-color: #bbf7d0; border-left-color: var(--green); }
.callout.success .co-title { color: var(--green); }

/* ============ docs layout ============ */
.docs-body { display: grid; grid-template-columns: 236px minmax(0, 1fr) 190px; gap: 40px; padding: 40px 28px 80px; }
.docs-sidebar { position: sticky; top: calc(var(--header-h) + 20px); align-self: start; max-height: calc(100vh - var(--header-h) - 40px); overflow-y: auto; padding-right: 8px; }
.docs-sidebar .docs-group-label { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--text-faint); margin: 20px 0 6px; font-weight: 600; }
.docs-sidebar .docs-group-label:first-child { margin-top: 0; }
.docs-sidebar a { display: block; color: var(--text-dim); font-size: 13.5px; padding: 5px 10px; border-radius: 6px; border-left: 2px solid transparent; }
.docs-sidebar a:hover { color: var(--text); background: var(--surface-2); }
.docs-sidebar a.active { color: var(--text); background: var(--surface-2); border-left-color: var(--accent); font-weight: 600; }
.docs-content { min-width: 0; }
.docs-content .prose { max-width: 760px; }
.breadcrumb { font-family: var(--mono); font-size: 12px; color: var(--text-faint); margin-bottom: 10px; }
.breadcrumb a { color: var(--text-faint); }
.breadcrumb a:hover { color: var(--accent); }
.docs-toc { position: sticky; top: calc(var(--header-h) + 20px); align-self: start; font-size: 13px; }
.docs-toc .toc-label { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--text-faint); font-weight: 600; margin-bottom: 8px; }
.docs-toc nav ul { list-style: none; border-left: 1px solid var(--border); }
.docs-toc nav li { margin: 0; }
.docs-toc nav a { display: block; color: var(--text-faint); padding: 3px 0 3px 14px; border-left: 1px solid transparent; margin-left: -1px; }
.docs-toc nav a:hover { color: var(--accent); }
.docs-toc nav ul ul a { padding-left: 26px; font-size: 12.5px; }
.doc-meta { margin-top: 44px; padding-top: 16px; border-top: 1px solid var(--border); font-size: 13px; color: var(--text-faint); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.doc-pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 36px; }
.doc-pager a { display: block; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 13px 16px; color: var(--text); }
.doc-pager a:hover { border-color: var(--accent); box-shadow: var(--shadow-sm); }
.doc-pager .dir { font-size: 11.5px; color: var(--text-faint); text-transform: uppercase; letter-spacing: .06em; }
.doc-pager .pg { font-weight: 600; font-size: 14px; }
.doc-pager .next { text-align: right; }

/* docs cards (landing + sections) */
.doc-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr)); gap: 16px; margin-top: 10px; }
.doc-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; transition: border-color .15s, box-shadow .15s; }
.doc-card:hover { border-color: var(--accent); box-shadow: var(--shadow-sm); }
.doc-card .dc-icon { color: var(--accent); display: block; margin-bottom: 10px; }
.doc-card h2, .doc-card h3 { font-size: 15.5px; margin-bottom: 5px; }
.doc-card h2 a, .doc-card h3 a { color: var(--text); }
.doc-card h2 a:hover, .doc-card h3 a:hover { color: var(--accent); }
.doc-card p { color: var(--text-dim); font-size: 13.5px; }
.doc-card .doc-card-meta { font-family: var(--mono); font-size: 11px; color: var(--text-faint); margin-top: 8px; }

/* use case / topology cards */
.uc-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.uc-card h3 { font-size: 16.5px; margin-bottom: 8px; }
.uc-card p { color: var(--text-dim); font-size: 14px; margin-bottom: 10px; }
.topo-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.topo-card h3 { font-size: 16.5px; margin-bottom: 4px; }
.topo-card .topo-tag { font-family: var(--mono); font-size: 12px; color: var(--accent); margin-bottom: 12px; display: block; }
.topo-card p { color: var(--text-dim); font-size: 14px; }
.topo-card svg { width: 100%; height: auto; margin: 16px 0 4px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }

/* ============ footer ============ */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-subtle); margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; padding: 44px 28px 28px; }
.footer-desc { color: var(--text-faint); font-size: 13.5px; margin-top: 12px; max-width: 340px; }
.footer-col { display: flex; flex-direction: column; gap: 7px; }
.footer-col .footer-col-title { font-size: 12px; text-transform: uppercase; letter-spacing: .07em; color: var(--text-faint); margin-bottom: 4px; font-weight: 600; }
.footer-col a { color: var(--text-dim); font-size: 13.5px; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 18px 28px; border-top: 1px solid var(--border); color: var(--text-faint); font-size: 12.5px; }
.footer-note { font-size: 12px; }

/* ============ responsive ============ */
@media (max-width: 1120px) {
  .docs-body { grid-template-columns: 220px minmax(0, 1fr); }
  .docs-toc { display: none; }
}
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .docs-body { grid-template-columns: 1fr; }
  .docs-sidebar { position: static; max-height: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--surface); border-bottom: 1px solid var(--border);
    padding: 10px 16px 16px; display: none;
    box-shadow: var(--shadow-md);
  }
  .main-nav.open { display: flex; }
  .nav-toggle { display: flex; }
  .doc-pager { grid-template-columns: 1fr; }
}

/* copy button */
.copy-btn {
  position: absolute; top: 9px; right: 9px;
  font-family: var(--mono); font-size: 11px; color: var(--text-faint);
  background: var(--surface); border: 1px solid var(--border); border-radius: 5px;
  padding: 2px 8px; cursor: pointer; opacity: 0; transition: opacity .15s, color .15s;
}
.prose pre:hover .copy-btn { opacity: 1; }
.copy-btn:hover { color: var(--text); border-color: var(--border-strong); }

.hidden { display: none !important; }
.dim { color: var(--text-faint); }

/* chroma (github style) marks unlexable tokens (e.g. HTTP request lines)
   with a dark maroon error background; keep code blocks clean on the
   light theme */
.prose .highlight span[style*="background-color"] {
  background-color: transparent !important;
}

/* screenshots */
.screenshot { margin: 0; }
.screenshot img {
  width: 100%; height: auto;
  border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-md); display: block;
  transition: border-color .15s, box-shadow .15s;
}
.screenshot a:hover img { border-color: var(--accent); box-shadow: 0 8px 24px rgba(15,23,42,.12); }
.screenshot figcaption {
  margin-top: 8px; font-size: 13px; color: var(--text-faint); text-align: center;
}