:root {
  --bg: #F6F8FA;
  --surface: #FFFFFF;
  --ink: #1F2937;
  --muted: #5B6573;
  --line: #DDE3EA;
  --navy: #0B1B2E;
  --accent: #12B886;
  --accent-ink: #0B7A5A;
  --danger: #C0392B;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0B1220;
    --surface: #111A2B;
    --ink: #E5E9F0;
    --muted: #9AA6B6;
    --line: #22304A;
    --navy: #060D18;
    --accent: #2BD49F;
    --accent-ink: #2BD49F;
    --danger: #FF6B5E;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--accent-ink); }
header.site {
  background: var(--navy);
  color: #fff;
  padding: 20px 16px;
  border-bottom: 4px solid var(--accent);
}
header.site .wrap { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
header.site a.brand { color: #fff; text-decoration: none; font-weight: 700; font-size: 1.25rem; }
header.site p { margin: 2px 0 0; color: #CFE9DF; font-size: .95rem; }
.wrap { max-width: 820px; margin: 0 auto; }
main { max-width: 820px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 1.7rem; line-height: 1.25; margin: 8px 0 12px; }
h2 { font-size: 1.15rem; margin-top: 28px; }
.muted, small { color: var(--muted); }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  margin: 14px 0;
}
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid .card { margin: 0; }
.card h2 { margin-top: 0; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #062A1E;
  font-weight: 700;
  border-radius: 10px;
  padding: 10px 16px;
  text-decoration: none;
  margin: 6px 8px 0 0;
}
.btn.secondary { background: transparent; color: var(--accent-ink); border: 1px solid var(--line); }
ul.features { padding-left: 1.2rem; }
label { display: block; font-weight: 600; margin-top: 12px; }
input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--bg);
  color: var(--ink);
}
button.danger {
  margin-top: 16px;
  background: var(--danger);
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: 12px 18px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
footer.site {
  border-top: 1px solid var(--line);
  padding: 20px 16px 32px;
  color: var(--muted);
  font-size: .9rem;
}
footer.site .wrap a { margin-right: 14px; }