:root {
  --bg: #ffffff;
  --bg-soft: #f3f8fd;
  --ink: #1a2433;
  --ink-soft: #4a5668;
  --line: #dde5ef;
  --primary: #1565c0;
  --primary-ink: #ffffff;
  --tint: #e8fbfd;
  --tint-ink: #0b6a78;
  --ok: #0f7a55;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1722;
    --bg-soft: #151f2d;
    --ink: #e8eef6;
    --ink-soft: #a9b6c7;
    --line: #26354a;
    --primary: #4a9bf0;
    --primary-ink: #0b1220;
    --tint: #10303a;
    --tint-ink: #7fdcec;
    --ok: #4cc79a;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: none; opacity: 0.8; }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }

header.site {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; gap: 16px; flex-wrap: wrap;
}
.brand { display: inline-flex; align-items: center; }
.brand img { height: 36px; width: auto; display: block; }
nav.main { display: flex; gap: 20px; flex-wrap: wrap; }
nav.main a { color: var(--ink-soft); font-weight: 500; }
nav.main a:hover { color: var(--ink); opacity: 1; }

.hero { background: var(--bg-soft); padding: 64px 0 56px; border-bottom: 1px solid var(--line); }
.hero h1 { font-size: clamp(32px, 6vw, 52px); line-height: 1.1; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero p.lead { font-size: 19px; color: var(--ink-soft); max-width: 640px; margin: 0 0 28px; }

.btn {
  display: inline-block; padding: 12px 22px; border-radius: 10px;
  font-weight: 600; border: 1px solid var(--primary);
  background: var(--primary); color: var(--primary-ink);
}
.btn:hover { opacity: 0.9; }
.btn.secondary { background: var(--tint); color: var(--tint-ink); border-color: var(--tint-ink); }

section { padding: 56px 0; }
section h2 { font-size: 30px; margin: 0 0 8px; letter-spacing: -0.01em; }
section p.sub { color: var(--ink-soft); margin: 0 0 32px; max-width: 640px; }

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr)); }
.grid > *, .plans > * { min-width: 0; }
.card {
  border: 1px solid var(--line); border-radius: 14px; padding: 20px;
  background: var(--bg);
}
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--ink-soft); }

.plans { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); }
.plan { border: 1px solid var(--line); border-radius: 16px; padding: 24px; }
.plan.featured { border: 2px solid var(--primary); }
.plan h3 { margin: 0; font-size: 22px; }
.plan .price { font-size: 40px; font-weight: 800; margin: 8px 0 0; letter-spacing: -0.02em; }
.plan .price small { font-size: 15px; font-weight: 500; color: var(--ink-soft); }
.plan .meta { color: var(--ink-soft); margin: 0 0 16px; }
.plan ul { padding-left: 0; list-style: none; margin: 16px 0 0; }
.plan li { padding-left: 24px; position: relative; margin-bottom: 8px; color: var(--ink-soft); }
.plan li::before { content: "\2713"; position: absolute; left: 0; color: var(--ok); font-weight: 700; }
.plan .btn { display: block; text-align: center; margin-top: 16px; }

.notice {
  background: var(--tint); color: var(--tint-ink); border-radius: 12px;
  padding: 14px 18px; margin-bottom: 24px;
}

.doc { padding: 48px 0 64px; max-width: 780px; }
.doc h1 { font-size: 36px; margin: 0 0 4px; letter-spacing: -0.02em; }
.doc .updated { color: var(--ink-soft); margin: 0 0 32px; }
.doc h2 { font-size: 22px; margin: 32px 0 8px; }
.doc p, .doc li { color: var(--ink); }
.doc ul { padding-left: 22px; }

footer.site { border-top: 1px solid var(--line); background: var(--bg-soft); padding: 32px 0; color: var(--ink-soft); font-size: 14px; }
footer.site .cols { display: grid; gap: 24px; grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr)); }
body { overflow-x: hidden; }
.hero .btn { margin-bottom: 8px; }
.doc, .wrap { overflow-wrap: anywhere; }
footer.site strong { color: var(--ink); }
footer.site a { color: var(--ink-soft); }
footer.site a:hover { color: var(--ink); opacity: 1; }
footer.site address { font-style: normal; }

@media (max-width: 520px) {
  .hero { padding: 40px 0; }
  section { padding: 40px 0; }
}