:root {
  color-scheme: light;
  --ink: #10251f;
  --muted: #52645e;
  --paper: #f7faf7;
  --surface: #ffffff;
  --brand: #1b6b4a;
  --accent: #c0e812;
  --border: #dbe7df;
  --danger: #a93636;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at top right, rgba(192, 232, 18, 0.18), transparent 30rem),
    var(--paper);
  color: var(--ink);
  line-height: 1.6;
}

header, main, footer {
  width: min(760px, calc(100% - 40px));
  margin-inline: auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 24px;
}

.brand {
  color: var(--ink);
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.badge {
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 5px 10px;
}

main {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: 0 24px 70px rgba(16, 37, 31, 0.08);
  padding: clamp(28px, 6vw, 56px);
}

h1, h2 {
  line-height: 1.15;
  letter-spacing: -0.035em;
}

h1 {
  font-size: clamp(2.2rem, 8vw, 4rem);
  margin: 0 0 16px;
}

h2 {
  font-size: 1.35rem;
  margin: 36px 0 10px;
}

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

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

.lede {
  font-size: 1.12rem;
  margin-bottom: 28px;
}

.callout {
  background: rgba(192, 232, 18, 0.13);
  border: 1px solid rgba(27, 107, 74, 0.18);
  border-radius: 18px;
  margin-block: 24px;
  padding: 18px;
}

.action {
  display: inline-block;
  background: var(--brand);
  border-radius: 999px;
  color: white;
  font-weight: 750;
  margin-top: 10px;
  padding: 12px 18px;
  text-decoration: none;
}

.danger { color: var(--danger); }

footer {
  color: var(--muted);
  font-size: 0.82rem;
  padding-block: 24px 40px;
  text-align: center;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --ink: #eef7f1;
    --muted: #b5c5bd;
    --paper: #07110e;
    --surface: #0e1c17;
    --brand: #bddd42;
    --border: #263b32;
  }
}