:root {
  --green: #2e7d32;
  --green-dark: #1b5e20;
  --text: #222;
  --muted: #666;
  --border: #eee;
  --bg: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 18px;
  color: var(--green);
  text-decoration: none;
}

nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}

nav a:hover,
nav a.active {
  color: var(--green);
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

h1 {
  font-size: 28px;
  margin-bottom: 6px;
}

.updated {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 28px;
}

h2 {
  font-size: 18px;
  margin-top: 32px;
  margin-bottom: 8px;
}

p, li {
  color: #333;
  font-size: 15px;
}

ul {
  padding-left: 20px;
}

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

.button {
  display: inline-block;
  background: var(--green);
  color: white;
  text-decoration: none;
  font-weight: 700;
  padding: 14px 22px;
  border-radius: 24px;
  margin-top: 8px;
}

.button:hover {
  background: var(--green-dark);
  color: white;
}

.note {
  background: #eef5ee;
  border: 1px solid #d5e8d5;
  border-radius: 10px;
  padding: 16px;
  font-size: 14px;
  color: #333;
  margin-top: 28px;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  padding: 30px 20px 50px;
}