:root {
  --bg: #fdfcfa;
  --text: #33302c;
  --muted: #6f6a63;
  --accent: #3a7d6a;
  --card: #f4f1ec;
  --border: #e4dfd7;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1d1c1a;
    --text: #ece9e4;
    --muted: #a39d94;
    --accent: #7fc0ac;
    --card: #262523;
    --border: #3a3835;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI",
    "Noto Sans JP", sans-serif;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

h1 {
  font-size: 2rem;
  margin: 0;
  letter-spacing: 0.06em;
}

h2 {
  font-size: 1.15rem;
  margin: 2.5rem 0 0.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

p,
ul {
  margin: 0.75rem 0;
}

ul {
  padding-left: 1.4rem;
}

li {
  margin: 0.5rem 0;
}

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

.tagline {
  color: var(--muted);
  margin-top: 0.5rem;
  font-size: 1.05rem;
}

.note {
  background: var(--card);
  border-radius: 0.6rem;
  padding: 0.8rem 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.button {
  display: inline-block;
  background: var(--accent);
  color: var(--bg);
  text-decoration: none;
  border-radius: 0.6rem;
  padding: 0.6rem 1.4rem;
  font-weight: 600;
}

footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}

footer p {
  margin: 0.25rem 0;
}