/* ベースリセット */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Helvetica Neue', Arial, 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', sans-serif;
  background-color: #f9f9f9;
  color: #333;
  line-height: 1.8;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ヒーローセクション */
.hero {
  text-align: center;
  padding: 3rem 0 2rem;
  border-bottom: 2px solid #eee;
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.hero .tagline {
  font-size: 1rem;
  color: #666;
}

/* セクション共通 */
section {
  margin-bottom: 2.5rem;
}

h2 {
  font-size: 1.4rem;
  font-weight: 700;
  border-left: 4px solid #333;
  padding-left: 0.75rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 1rem;
  margin-bottom: 0.4rem;
  color: #555;
}

p {
  margin-bottom: 0.75rem;
}

ul {
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
}

li {
  margin-bottom: 0.3rem;
}

/* スキルグループ */
.skill-group {
  margin-top: 1rem;
}

strong {
  font-weight: 600;
}