:root {
  color-scheme: light;
  --green: #1f6f43;
  --green-dark: #174f32;
  --green-soft: #e8f4ec;
  --text: #1f2933;
  --muted: #52616b;
  --border: #d8e2dc;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: #f7faf8;
  line-height: 1.6;
}
header {
  background: var(--green);
  color: white;
  padding: 1rem 1.25rem;
}
header a { color: white; text-decoration: none; }
nav { margin-top: 0.5rem; display: flex; gap: 1rem; flex-wrap: wrap; }
nav a { text-decoration: underline; }
main {
  width: min(820px, calc(100% - 2rem));
  margin: 2rem auto;
  background: white;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: clamp(1.25rem, 4vw, 2.5rem);
  box-shadow: 0 8px 28px rgba(31, 41, 51, 0.07);
}
h1, h2 { color: var(--green-dark); line-height: 1.25; }
h1 { margin-top: 0; }
a { color: var(--green-dark); }
.notice {
  background: var(--green-soft);
  border-left: 4px solid var(--green);
  padding: 1rem;
  border-radius: 6px;
}
.button {
  display: inline-block;
  background: var(--green);
  color: white;
  padding: 0.7rem 1rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
}
footer {
  width: min(820px, calc(100% - 2rem));
  margin: 0 auto 2rem;
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
}