body {
  margin: 0;
  font-family: "Segoe UI", "Noto Sans JP", sans-serif;
  background: #ffffff;
  color: #222;
  line-height: 1.8;
}

.header {
  padding: 20px;
  border-bottom: 1px solid #eee;
}

.logo {
  margin: 0;
  letter-spacing: 0.2em;
}

.sub {
  margin: 4px 0 0;
  color: #666;
  font-size: 13px;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px;
}

.hero {
  margin: 40px 0;
}

.hero h2 {
  font-size: 28px;
}

.card {
  border: 1px solid #eee;
  padding: 20px;
  margin: 20px 0;
}

.footer {
  border-top: 1px solid #eee;
  padding: 20px;
  text-align: center;
  color: #666;
}

.small {
  font-size: 12px;
}