:root {
  --bg: #F8FAFC; --surface: #FFFFFF; --ink: #0F172A; --muted: #64748B; --line: #E2E8F0;
  --dark: #0B1729; --dark-2: #111F36; --on-dark: #F1F5F9; --on-dark-muted: #94A3B8;
  --blue: #1D4ED8; --sky: #38BDF8; --sky-soft: #E0F2FE;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0B1220; --surface: #111B2E; --ink: #E2E8F0; --muted: #94A3B8; --line: #1E293B; --blue: #60A5FA; --sky-soft: #0C2A3F; }
}
html { color-scheme: light dark; scroll-behavior: smooth; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: "Manrope", "Segoe UI", system-ui, sans-serif; font-size: 17px; line-height: 1.65; -webkit-font-smoothing: antialiased; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1080px; margin: 0 auto; padding-inline: 24px; }

/* nav */
.nav { background: var(--dark); color: var(--on-dark); position: sticky; top: 0; z-index: 10; }
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--on-dark); font-weight: 800; font-size: 19px; letter-spacing: -0.01em; }
.logo:hover { text-decoration: none; }
.logo svg { width: 28px; height: 28px; color: #fff; }
.nav-links { display: flex; gap: 28px; font-size: 15px; font-weight: 600; }
.nav-links a { color: var(--on-dark-muted); }
.nav-links a:hover, .nav-links a[aria-current] { color: #fff; text-decoration: none; }

/* hero */
.hero { background: var(--dark); color: var(--on-dark); padding-block: 88px 96px; position: relative; overflow: hidden; }
.hero::after { content: ""; position: absolute; inset: auto -20% -60% auto; width: 60%; aspect-ratio: 1; border-radius: 50%; background: radial-gradient(closest-side, rgba(56,189,248,0.25), transparent); pointer-events: none; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--sky); margin-bottom: 20px; }
.hero h1 { font-size: clamp(38px, 6vw, 64px); line-height: 1.05; letter-spacing: -0.03em; font-weight: 800; margin: 0 0 20px; max-width: 14ch; text-wrap: balance; }
.hero p { font-size: 20px; color: var(--on-dark-muted); max-width: 52ch; margin: 0 0 36px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-flex; align-items: center; height: 48px; padding-inline: 22px; border-radius: 10px; font-weight: 700; font-size: 15px; }
.btn-primary { background: var(--sky); color: #06202F; }
.btn-primary:hover { background: #7DD3FC; text-decoration: none; }
.btn-ghost { color: #fff; border: 1px solid rgba(255,255,255,0.25); }
.btn-ghost:hover { border-color: #fff; text-decoration: none; }

/* features */
.features { padding-block: 80px; }
.features h2 { font-size: 30px; letter-spacing: -0.02em; margin: 0 0 8px; }
.features > .wrap > p { color: var(--muted); margin: 0 0 40px; max-width: 60ch; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 28px; }
.card .ic { width: 40px; height: 40px; border-radius: 10px; background: var(--sky-soft); color: var(--blue); display: grid; place-items: center; margin-bottom: 18px; }
.card h3 { margin: 0 0 8px; font-size: 18px; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.trust { border-top: 1px solid var(--line); padding-block: 56px; }
.trust .wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.trust h2 { font-size: 26px; letter-spacing: -0.02em; margin: 0 0 12px; }
.trust p { color: var(--muted); margin: 0; }
.trust ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.trust li { display: flex; gap: 12px; align-items: flex-start; font-size: 15px; }
.trust li::before { content: "✓"; color: var(--blue); font-weight: 800; flex: none; }

/* doc page */
.doc-head { background: var(--dark); color: var(--on-dark); padding-block: 64px 56px; }
.doc-head h1 { font-size: clamp(34px, 5vw, 52px); line-height: 1.08; letter-spacing: -0.03em; font-weight: 800; margin: 0 0 12px; }
.doc-head p { color: var(--on-dark-muted); margin: 0; font-size: 16px; }
.doc { display: grid; grid-template-columns: 240px 1fr; gap: 56px; padding-block: 56px 96px; }
.toc { position: sticky; top: 88px; align-self: start; font-size: 14px; }
.toc strong { display: block; font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 12px; }
.toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.toc a { color: var(--muted); font-weight: 600; }
.toc a:hover { color: var(--ink); text-decoration: none; }
.prose { max-width: 68ch; }
.prose h2 { font-size: 24px; letter-spacing: -0.02em; margin: 48px 0 12px; scroll-margin-top: 88px; }
.prose h2:first-child { margin-top: 0; }
.prose p, .prose ul { margin: 0 0 16px; }
.prose ul { padding-left: 22px; }
.prose li { margin-bottom: 6px; }
.prose code { font-family: "JetBrains Mono", Menlo, monospace; font-size: 0.86em; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 2px 6px; }
.summary { background: var(--sky-soft); border-radius: 14px; padding: 22px 26px; margin: 0 0 40px; font-size: 17px; }
.summary strong { display: block; font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--blue); margin-bottom: 8px; }
.scroll { overflow-x: auto; margin: 0 0 16px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 12px 14px; border-bottom: 1px solid var(--line); }
th { font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.contact { display: inline-flex; align-items: center; gap: 10px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; font-weight: 700; }

footer { border-top: 1px solid var(--line); padding-block: 28px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }

@media (max-width: 860px) {
  .grid { grid-template-columns: 1fr; }
  .trust .wrap { grid-template-columns: 1fr; }
  .doc { grid-template-columns: 1fr; gap: 32px; }
  .toc { position: static; }
  .nav-links { gap: 18px; }
}