:root {
  color-scheme: light;
  --green: #0a3d2d;
  --leaf: #1f6d47;
  --dirt: #ad5c2b;
  --cream: #f7f3e8;
  --ink: #14231d;
  --muted: #5f6d66;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.8;
}
a { color: var(--leaf); }
header {
  background: var(--green);
  color: white;
  padding: 28px 20px;
}
header div, main, footer { max-width: 820px; margin: 0 auto; }
header h1 { margin: 0; font-size: clamp(1.6rem, 5vw, 2.3rem); }
header p { margin: 4px 0 0; opacity: .82; }
nav { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 12px; }
nav a { color: white; }
main { padding: 44px 20px 64px; }
h2 { color: var(--green); border-bottom: 2px solid #d7e4db; padding-bottom: 6px; }
h3 { color: var(--green); }
.hero {
  background: white;
  border-radius: 22px;
  padding: 30px;
  box-shadow: 0 12px 35px rgba(10, 61, 45, .09);
}
.notice { border-left: 5px solid var(--dirt); padding: 12px 16px; background: #fff8ef; }
.button {
  display: inline-block;
  margin-top: 12px;
  padding: 11px 18px;
  border-radius: 999px;
  background: var(--leaf);
  color: white;
  text-decoration: none;
  font-weight: 700;
}
footer { padding: 26px 20px 42px; color: var(--muted); font-size: .9rem; }
@media (max-width: 540px) { .hero { padding: 22px; } }