/* Qiita風・シンプル＆スマートなデザイン */

body {
  font-family: "Hiragino Sans", sans-serif;
  margin: 0;
  padding: 0;
  background: #F9FAFB;
  color: #222;
  line-height: 1.8;
}

header {
  background: #E4E7EB;
  color: #333;
  text-align: center;
  padding: 24px;
}

header h1 {
  font-size: 26px;
  margin: 0;
}

.logo {
  width: 120px;
}

main {
  max-width: 900px;
  margin: 2.5rem auto;
  padding: 1.5rem;
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 2px 12px rgba(44, 182, 150, 0.08);
}

.block {
  margin-bottom: 2.5rem;
}

.block h2 {
  margin: 0 0 32px;
  color: #333;
  font-size: 1.3rem;
  text-align: center;
  font-weight: 600;
}

.block h2:not(:first-of-type) {
  margin-top: 48px;
}

.block-item {
  background: #f9f9f9;
  border: 1px solid #eee;
  border-radius: 8px;
  margin-bottom: 16px;
  padding: 1rem 1.2rem;
}

.block-img {
  height: 48px;
  width: auto;
  display: block;
  margin-bottom: 12px;
}

.block-item h3 {
  margin: 0 0 8px;
  color: #3D9FFA;
  font-size: 14px;
  font-weight: 600;
}

.block-item p {
  margin: 0;
  color: #444;
  font-size: 14px;
}

footer {
  background: #333;
  text-align: center;
  padding: 1.2rem;
  font-size: 0.95rem;
  color: #fff;
  margin-top: 2rem;
}