:root {
  color-scheme: light dark;
  --ink: #122a2d;
  --muted: #526367;
  --ocean: #218b91;
  --paper: #f8f3e9;
  --card: #ffffff;
  --line: #d9dfdc;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

main {
  width: min(760px, calc(100% - 40px));
  margin: 0 auto;
  padding: 56px 0 72px;
}

header { margin-bottom: 36px; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-size: 22px;
  font-weight: 750;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-icon {
  display: block;
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

h1 {
  margin: 26px 0 12px;
  max-width: 660px;
  font-size: clamp(38px, 8vw, 58px);
  line-height: 1.03;
  letter-spacing: -0.045em;
}

h2 {
  margin: 36px 0 10px;
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

p, li { color: var(--muted); }
a { color: var(--ocean); }

.lead {
  max-width: 650px;
  margin: 0 0 30px;
  font-size: 20px;
}

.card {
  margin: 20px 0;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
}

.card h2 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }

.button {
  display: inline-block;
  margin-top: 8px;
  padding: 11px 17px;
  border-radius: 999px;
  background: var(--ocean);
  color: white;
  font-weight: 650;
  text-decoration: none;
}

footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 15px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #edf6f4;
    --muted: #bac8c7;
    --paper: #091215;
    --card: #111e21;
    --line: #2b3b3e;
    --ocean: #65c8cc;
  }
}