:root {
  --primary: #004DFF;
  --bg: #f7f7f8;
  --card: #ffffff;
  --text: #222;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 40px 16px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, "Noto Sans JP", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  max-width: 720px;
  margin: 0 auto;
  background: var(--card);
  padding: 32px;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

h1 {
  text-align: center;
  margin-bottom: 32px;
}

h2 {
  border-left: 4px solid var(--primary);
  padding-left: 12px;
  margin-top: 32px;
}

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

a:hover {
  text-decoration: underline;
}

footer {
  margin-top: 48px;
  text-align: center;
  font-size: 0.85rem;
  color: #666;
}