:root {
  --fg: #0f172a;
  --muted: #64748b;
  --bg: #ffffff;
  --surface: #f8fafc;
  --border: #e2e8f0;
  --primary: #0ea5e9;
  --primary-fg: #ffffff;
  --max-width: 960px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; color: var(--fg); background: var(--bg); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

header {
  border-bottom: 1px solid var(--border);
  background: #fff;
}
header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}
header .brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--fg);
}
header .spacer { flex: 1; }
header nav a.current { color: var(--fg); font-weight: 600; }

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--fg);
}
.btn.primary { background: var(--primary); color: var(--primary-fg); border-color: var(--primary); }
.btn:hover { text-decoration: none; filter: brightness(0.98); }

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.hero { text-align: center; padding: 64px 24px; }
.hero h1 { font-size: 44px; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero p  { font-size: 18px; color: var(--muted); max-width: 560px; margin: 0 auto 32px; line-height: 1.5; }
.hero .cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 32px 0;
}
@media (max-width: 720px) { .features { grid-template-columns: 1fr; } }
.feature { padding: 24px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); }
.feature h3 { margin: 0 0 8px; }
.feature p  { margin: 0; color: var(--muted); line-height: 1.5; }

.pricing {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 32px 0;
}
@media (max-width: 720px) { .pricing { grid-template-columns: 1fr; } }
.tier { padding: 24px; border: 1px solid var(--border); border-radius: 12px; background: #fff; display: flex; flex-direction: column; }
.tier h3 { margin: 0 0 4px; }
.tier .price { font-size: 28px; font-weight: 700; margin: 12px 0; }
.tier ul { padding-left: 18px; margin: 0 0 24px; line-height: 1.6; color: var(--muted); }
.tier.featured { border-color: var(--primary); box-shadow: 0 0 0 3px #0ea5e922; }
.tier .btn { margin-top: auto; text-align: center; }

.docs-layout { display: grid; grid-template-columns: 240px 1fr; gap: 32px; }
@media (max-width: 720px) { .docs-layout { grid-template-columns: 1fr; } }
.docs-nav { position: sticky; top: 24px; align-self: start; }
.docs-nav h4 { margin: 0 0 8px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
.docs-nav ul { list-style: none; padding: 0; margin: 0 0 24px; }
.docs-nav li { margin: 4px 0; }
.docs-content h2 { margin-top: 32px; }
.docs-content pre {
  background: #0f172a; color: #e2e8f0; padding: 14px; border-radius: 8px; overflow: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px;
}
.docs-content code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }

footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
  margin-top: 64px;
}
footer .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
footer .spacer { flex: 1; }