:root {
  --bg: #0c0c0d;
  --panel: #17171a;
  --line: #2a2a2f;
  --text: #f2f2f4;
  --muted: #9a9aa3;
  --accent: #e8e8ec;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--text); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }

/* header */
header { border-bottom: 1px solid var(--line); }
nav {
  display: flex; align-items: center; gap: 22px;
  max-width: 760px; margin: 0 auto; padding: 18px 24px;
}
nav .brand { display: flex; align-items: center; gap: 10px; font-weight: 600; text-decoration: none; margin-right: auto; }
nav .brand img { width: 26px; height: 26px; border-radius: 7px; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); }

/* hero */
.hero { text-align: center; padding: 76px 0 64px; }
.hero img.icon { width: 128px; height: 128px; border-radius: 28px; }
.hero h1 { font-size: 44px; letter-spacing: -0.02em; margin: 28px 0 12px; }
.hero p.tag { color: var(--muted); font-size: 19px; margin: 0 auto 32px; max-width: 30em; }

.btn {
  display: inline-block; padding: 13px 26px; border-radius: 12px;
  background: var(--accent); color: #0c0c0d; text-decoration: none; font-weight: 600;
}
.btn:hover { opacity: .88; }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line); }
.req { color: var(--muted); font-size: 14px; margin-top: 18px; }

/* bar mock */
.mock {
  display: inline-block; margin: 8px 0 0; padding: 7px 14px;
  border: 1px solid var(--line); border-radius: 9px; background: var(--panel);
  font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 14px; color: var(--muted);
}

/* features */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; padding: 8px 0 72px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; }
.card h3 { margin: 0 0 6px; font-size: 16px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

/* docs pages */
main.doc { padding: 56px 24px 80px; }
main.doc h1 { font-size: 32px; letter-spacing: -0.02em; margin: 0 0 6px; }
main.doc h2 { font-size: 19px; margin: 40px 0 10px; }
main.doc p, main.doc li { color: #d4d4da; }
main.doc .updated { color: var(--muted); font-size: 14px; margin: 0 0 8px; }
main.doc ul { padding-left: 20px; }

footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); }
footer .row { display: flex; gap: 18px; flex-wrap: wrap; }
footer .row span { margin-right: auto; }

@media (max-width: 520px) {
  .hero { padding: 52px 0 44px; }
  .hero h1 { font-size: 34px; }
}

/* ---------- document pages ---------- */
:root { --accent-warm: #f3b64b; --accent-soft: rgba(243, 182, 75, .12); }

.page-head {
  text-align: center;
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 48px;
}
.page-head .kicker {
  display: inline-block;
  font-size: 12px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent-warm); background: var(--accent-soft);
  padding: 5px 12px; border-radius: 999px; margin: 0 0 18px;
}
.page-head h1 { font-size: 38px; letter-spacing: -0.025em; margin: 0 0 10px; }
.page-head p { color: var(--muted); margin: 0; font-size: 17px; }

.callout {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent-warm);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 0 0 44px;
}
.callout strong { color: var(--accent-warm); }
main.doc .callout p { margin: 0; }

.qa { display: grid; gap: 14px; }
.qa section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 24px;
  transition: border-color .15s ease;
}
.qa section:hover { border-color: #3a3a42; }
main.doc .qa h2 { font-size: 17px; margin: 0 0 8px; letter-spacing: -0.01em; }
main.doc .qa p, main.doc .qa li { margin: 0 0 10px; color: #c9c9d2; font-size: 15.5px; }
main.doc .qa p:last-child, main.doc .qa li:last-child { margin-bottom: 0; }
main.doc .qa ul { margin: 0 0 10px; padding-left: 20px; }
.qa code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 13px; background: #0e0e10; border: 1px solid var(--line);
  padding: 1px 6px; border-radius: 5px; color: var(--muted);
}
.qa a { color: var(--accent-warm); text-decoration: none; border-bottom: 1px solid rgba(243,182,75,.35); }
.qa a:hover { border-bottom-color: var(--accent-warm); }

.contact-card {
  margin-top: 44px; text-align: center;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 16px; padding: 34px 24px;
}
main.doc .contact-card h2 { margin: 0 0 8px; font-size: 20px; }
main.doc .contact-card p { color: var(--muted); margin: 0 0 20px; }

main.doc { padding-top: 0; padding-bottom: 80px; }
main.doc .updated { color: var(--muted); font-size: 13.5px; }

@media (min-width: 760px) { .qa.two { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .page-head { padding: 44px 0 32px; } .page-head h1 { font-size: 30px; } }