:root {
  --color-primary: #0a0a0a;
  --color-on-primary: #ffffff;
  --color-brand-green: #00d4a4;
  --color-brand-green-deep: #00b48a;
  --color-brand-green-soft: #7cebcb;
  --color-brand-tag: #3772cf;
  --color-brand-warn: #c37d0d;
  --color-brand-annotate: #1ba673;
  --color-brand-error: #d45656;
  --color-hero-sky-from: #87a8c8;
  --color-hero-sky-to: #f5e9d8;
  --color-hero-dark-from: #1a3d4a;
  --color-hero-dark-to: #2d5a4f;
  --color-testimonial-orange: #f55a3c;
  --color-canvas: #ffffff;
  --color-canvas-dark: #0a0a0a;
  --color-surface: #f7f7f7;
  --color-surface-soft: #fafafa;
  --color-surface-code: #1c1c1e;
  --color-hairline: #e5e5e5;
  --color-hairline-soft: #ededed;
  --color-hairline-dark: #1f1f1f;
  --color-ink: #0a0a0a;
  --color-charcoal: #1c1c1e;
  --color-slate: #3a3a3c;
  --color-steel: #5a5a5c;
  --color-stone: #888888;
  --color-muted: #a8a8aa;
  --color-on-dark: #ffffff;
  --color-on-dark-muted: #b3b3b3;
  --rounded-xs: 4px;
  --rounded-sm: 6px;
  --rounded-md: 8px;
  --rounded-lg: 12px;
  --rounded-xl: 16px;
  --rounded-xxl: 24px;
  --rounded-full: 9999px;
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 20px;
  --space-xl: 24px;
  --space-xxl: 32px;
  --space-xxxl: 40px;
  --space-section: 64px;
  --space-section-lg: 96px;
  --space-hero: 120px;
  --font: Inter, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--color-ink);
  background: var(--color-canvas);
  font-size: 16px;
  line-height: 1.5;
}
a { color: var(--color-ink); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1280px; margin: 0 auto; padding: 0 32px; }

.promo {
  background: var(--color-canvas-dark);
  color: var(--color-on-dark);
  text-align: center;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 500;
}

.header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--color-canvas);
  border-bottom: 1px solid var(--color-hairline-soft);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 64px;
  flex-wrap: wrap;
}
.logo { font-weight: 600; color: var(--color-ink); font-size: 16px; }
.logo:hover { text-decoration: none; }
.nav { display: flex; flex-wrap: wrap; gap: 4px 20px; flex: 1; }
.nav a { color: var(--color-slate); font-size: 14px; font-weight: 500; }
.nav a.on { color: var(--color-ink); }
.back { margin-left: auto; font-size: 13px; color: var(--color-steel); }

.hero {
  background: linear-gradient(180deg, var(--color-hero-sky-from) 0%, var(--color-hero-sky-to) 100%);
  padding: var(--space-hero) 0 80px;
  text-align: center;
}
.hero h1 {
  font-size: 72px;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -2px;
  margin: 0 0 16px;
  color: var(--color-ink);
}
.hero p {
  margin: 0 auto 28px;
  color: var(--color-slate);
  font-size: 18px;
  max-width: 40em;
}
.hero-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-bottom: 40px; }

.mockup {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline-soft);
  border-radius: var(--rounded-lg);
  box-shadow: rgba(0, 0, 0, 0.12) 0px 24px 48px -8px;
  max-width: 920px;
  margin: 0 auto;
  overflow: hidden;
  text-align: left;
}
.docs-chrome {
  display: grid;
  grid-template-columns: 200px 1fr 160px;
  min-height: 280px;
}
.docs-side {
  background: var(--color-surface-soft);
  border-right: 1px solid var(--color-hairline);
  padding: 16px;
  font-size: 13px;
  color: var(--color-steel);
}
.docs-side .sec {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin: 12px 0 6px;
}
.docs-side a {
  display: block;
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--color-steel);
}
.docs-side a.on { background: var(--color-surface); color: var(--color-ink); font-weight: 500; }
.docs-body { padding: 24px; }
.docs-body h3 { margin: 0 0 8px; font-size: 22px; }
.docs-toc { padding: 16px; border-left: 1px solid var(--color-hairline); font-size: 13px; color: var(--color-steel); }
.docs-toc .on { color: var(--color-ink); font-weight: 500; border-left: 2px solid var(--color-brand-green); padding-left: 8px; }

.code {
  background: var(--color-surface-code);
  color: var(--color-on-dark);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  border-radius: var(--rounded-md);
  padding: 16px;
  overflow: auto;
}
.code .head {
  color: var(--color-on-dark-muted);
  font-size: 12px;
  border-bottom: 1px solid var(--color-hairline-dark);
  margin: -16px -16px 12px;
  padding: 8px 16px;
}
.inline-code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: 4px;
  padding: 2px 6px;
}

.btn, form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 20px;
  border: 0;
  border-radius: var(--rounded-full);
  cursor: pointer;
}
.btn:hover, form button:hover { text-decoration: none; background: var(--color-charcoal); color: #fff; }
.btn-green {
  background: var(--color-brand-green);
  color: var(--color-primary);
}
.btn-green:hover { background: var(--color-brand-green-deep); color: var(--color-primary); }
.btn-secondary {
  background: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-hairline);
}
.btn-secondary:hover { background: var(--color-surface); color: var(--color-ink); }
.btn-on-dark {
  background: var(--color-on-dark);
  color: var(--color-primary);
}

.section { padding: var(--space-section-lg) 0; }
.section h2 {
  font-size: 36px;
  font-weight: 600;
  letter-spacing: -0.5px;
  line-height: 1.2;
  margin: 0 0 32px;
}
.muted { color: var(--color-steel); max-width: 46em; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

.card {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-lg);
  padding: 24px;
}
.card h3 { margin: 0 0 8px; font-size: 18px; font-weight: 600; }
.card p { margin: 0; color: var(--color-steel); font-size: 14px; }
.card.featured {
  border: 2px solid var(--color-brand-green);
  box-shadow: rgba(0, 212, 164, 0.08) 0px 8px 24px;
}
.card.stat h3 { font-size: 28px; }
.check { color: var(--color-brand-green); font-weight: 600; margin-right: 6px; }

.logos {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
  color: var(--color-steel);
  font-weight: 500;
  padding: 24px 0;
}

.quote {
  background: var(--color-testimonial-orange);
  color: var(--color-on-dark);
  border-radius: var(--rounded-lg);
  padding: 64px;
}
.quote h3 { margin: 0 0 12px; font-size: 28px; color: #fff; }
.quote p { color: rgba(255,255,255,0.9); }

.ph {
  background: var(--color-surface);
  color: var(--color-stone);
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  margin-bottom: 12px;
  border-radius: var(--rounded-md);
}

.list { list-style: none; margin: 0; padding: 0; }
.list li { border-bottom: 1px solid var(--color-hairline-soft); padding: 16px 0; font-weight: 500; }
.list .date { color: var(--color-steel); font-size: 13px; font-weight: 400; margin-right: 12px; }

.prop {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-hairline-soft);
  font-size: 14px;
}
.badge-req {
  background: var(--color-brand-error);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  padding: 2px 6px;
  border-radius: 6px;
  margin-left: 8px;
}
.badge-type {
  background: var(--color-surface);
  color: var(--color-steel);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 2px 6px;
  border-radius: 6px;
}

form label { display: block; margin: 0 0 4px; font-size: 14px; font-weight: 500; }
form input, form textarea {
  width: 100%;
  max-width: 480px;
  height: 40px;
  padding: 12px 16px;
  border: 1px solid var(--color-hairline);
  background: var(--color-canvas);
  color: var(--color-ink);
  font: inherit;
  margin-bottom: 12px;
  border-radius: var(--rounded-md);
}
form textarea { height: auto; min-height: 110px; }
form input:focus, form textarea:focus {
  outline: none;
  border: 2px solid var(--color-brand-green);
}

.footer {
  border-top: 1px solid var(--color-hairline);
  padding: 64px 0 40px;
  color: var(--color-steel);
  font-size: 14px;
}
.footer-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.footer h4 { margin: 0 0 12px; color: var(--color-ink); font-size: 14px; font-weight: 500; }
.footer a { color: var(--color-steel); display: block; padding: 4px 0; }

@media (max-width: 1024px) {
  .hero h1 { font-size: 44px; }
  .docs-chrome { grid-template-columns: 1fr; }
  .docs-side, .docs-toc { display: none; }
}
@media (max-width: 720px) {
  .wrap { padding: 0 16px; }
  .hero h1 { font-size: 36px; letter-spacing: -1px; }
  .grid, .grid-2, .grid-4, .footer-grid { grid-template-columns: 1fr; }
  .quote { padding: 32px; }
}

.ph { overflow: hidden; }
.ph img { width: 100%; height: 100%; object-fit: cover; display: block; }