:root {
  --bg: #f7faf5;
  --surface: #ffffff;
  --text: #2f3a2f;
  --subtext: #5f6b5f;
  --accent: #7fb37b;
  --border: #d7e8d4;
  --shadow: rgba(120, 150, 120, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 48px 20px 64px;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.8;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 48px 48px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: 0 8px 28px var(--shadow);
}

.back-link,
.page-switcher a,
.contact-link {
  color: #527c4f;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.back-link {
  display: inline-block;
  margin-bottom: 24px;
  font-size: 14px;
}

h1 {
  margin: 0;
  font-size: clamp(30px, 6vw, 44px);
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.updated {
  margin: 12px 0 36px;
  color: var(--subtext);
  font-size: 14px;
}

h2 {
  margin: 42px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  font-size: 22px;
  line-height: 1.5;
}

p {
  margin: 0 0 16px;
}

ul {
  margin: 0 0 18px;
  padding-left: 1.5em;
}

li + li {
  margin-top: 6px;
}

.page-switcher {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

@media (max-width: 640px) {
  body {
    padding: 20px 12px 40px;
  }

  main {
    padding: 28px 22px 36px;
    border-radius: 22px;
  }

  h2 {
    margin-top: 34px;
    font-size: 20px;
  }
}