:root {
  --bg: #fafafa;
  --card-bg: #ffffff;
  --text-main: #222;
  --text-sub: #666;
  --accent: #ff4f8b; /* ← アプリアイコンに合わせて調整OK */
  --border: #eaeaea;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
  color: var(--text-main);
  line-height: 1.8;
}

header {
  text-align: center;
  padding: 48px 16px 32px;
}

header h1 {
  margin: 0;
  font-size: 2.2rem;
  letter-spacing: 0.02em;
}

header .tagline {
  margin-top: 8px;
  color: var(--text-sub);
  font-size: 1rem;
}

main {
  max-width: 720px;
  margin: auto;
  padding: 0 16px 64px;
}

section {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 32px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.04);
}

h2 {
  margin-top: 0;
  font-size: 1.2rem;
  border-left: 4px solid var(--accent);
  padding-left: 12px;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul, ol {
  padding-left: 1.2em;
}

footer {
  text-align: center;
  padding: 32px 16px;
  font-size: 0.85rem;
  color: var(--text-sub);
}