:root {
  --bg: #ffffff;
  --surface: #f4f4f8;
  --text: #111827;
  --muted: #4b5563;
  --line: #e5e7eb;
  --brand: #4f46e5;
  --brand-strong: #3730a3;
  --accent: #fbbf24;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b12;
    --surface: #16161f;
    --text: #f3f4f6;
    --muted: #a1a1aa;
    --line: #27272f;
    --brand: #818cf8;
    --brand-strong: #a5b4fc;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--brand); }
a:hover { color: var(--brand-strong); }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; }

header.site {
  border-bottom: 1px solid var(--line);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; gap: 16px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--text); text-decoration: none; font-weight: 700; font-size: 18px;
}
.brand img { width: 32px; height: 32px; border-radius: 8px; }
nav.top a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 15px; }
nav.top a:hover { color: var(--text); }

.hero { padding-top: 72px; padding-bottom: 56px; text-align: center; }
.hero img.icon { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 12px 32px rgba(79, 70, 229, .35); }
.hero h1 { font-size: clamp(34px, 6vw, 54px); line-height: 1.1; margin: 28px 0 14px; letter-spacing: -0.02em; }
.hero p.lead { font-size: clamp(18px, 2.6vw, 21px); color: var(--muted); max-width: 620px; margin: 0 auto 28px; }
.badge {
  display: inline-block; padding: 12px 22px; border-radius: 12px;
  background: var(--brand); color: #fff; font-weight: 600; text-decoration: none;
}
@media (prefers-color-scheme: dark) { .badge { background: #4f46e5; } }
.hero .note { display: block; margin-top: 12px; color: var(--muted); font-size: 14px; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr)); gap: 16px; padding-top: 8px; padding-bottom: 64px; }
.card { background: var(--surface); border-radius: 16px; padding: 22px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }

.pricing { padding-bottom: 64px; }
.pricing h2 { text-align: center; font-size: 28px; margin: 0 0 8px; }
.pricing p.sub { text-align: center; color: var(--muted); margin: 0 0 24px; }
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); gap: 16px; }
.plan { border: 1px solid var(--line); border-radius: 16px; padding: 20px; }
.plan strong { display: block; font-size: 18px; }
.plan .price { font-size: 26px; font-weight: 700; margin: 6px 0 2px; }
.plan .meta { color: var(--muted); font-size: 15px; }

.doc { padding-top: 40px; padding-bottom: 64px; }
.doc h1 { font-size: 34px; line-height: 1.2; margin: 0 0 6px; }
.doc .updated { color: var(--muted); margin: 0 0 28px; font-size: 15px; }
.doc h2 { font-size: 22px; margin: 36px 0 8px; }
.doc h3 { font-size: 18px; margin: 22px 0 6px; }
.doc p, .doc li { color: var(--text); }
.doc ul { padding-left: 22px; }
.doc li { margin: 4px 0; }
.doc .box { background: var(--surface); border-radius: 12px; padding: 16px 18px; margin: 16px 0; }

footer.site { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
footer.site .wrap { display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; }
footer.site a { color: var(--muted); text-decoration: none; margin-right: 16px; }
footer.site a:hover { color: var(--text); }

@media (max-width: 520px) {
  nav.top a { margin-left: 12px; }
  .hero { padding-top: 48px; }
}