#section {
  height: auto !important; /* 既存の height: 100vh を上書き */
  min-height: 100vh;
  z-index: 9;
}
/* フッターの固定を解除 */
body.achieve-page .footer {
  position: relative !important;
}
#section {
  font-family: 'Hiragino Sans', 'ヒラギノ角ゴシック', 'Yu Gothic', '游ゴシック', 'Meiryo', 'メイリオ', sans-serif;
  line-height: 1.6;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 40px 0;
}

#section .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

#section header {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  padding: 30px;
  margin-bottom: 40px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

#section h1 {
  color: white;
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 10px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

#section .subtitle {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.1rem;
  font-weight: 300;
}

#section .achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

#section .achievement-card {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 16px;
  padding: 25px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.3);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

#section .achievement-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

#section .achievement-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, #667eea, #764ba2);
}

#section .period {
  display: inline-block;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 15px;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

#section .project-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #2d3748;
  line-height: 1.5;
  margin-bottom: 10px;
}

#section .project-category {
  display: inline-block;
  background: #e2e8f0;
  color: #4a5568;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 500;
}

#section .stats {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  padding: 30px;
  margin-top: 40px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

#section .stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

#section .stat-item {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

#section .stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: white;
  display: block;
  margin-bottom: 5px;
}

#section .stat-label {
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.9rem;
}

#section .filter-buttons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 30px 0;
}

#section .filter-btn {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 25px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 500;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

#section .filter-btn:hover,
#section .filter-btn.active {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

#statistics {
  color: white;
  margin-bottom: 20px;
  font-size: 1.8rem;
  text-align: center;
}

@media (max-width: 768px) {
  #section .container {
    padding: 0 15px;
  }

  #section h1 {
    font-size: 2rem;
  }

  #section .achievements-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  #section .achievement-card {
    padding: 20px;
  }

  #section .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
  }

  #section .filter-buttons {
    margin: 20px 0;
  }
}

@media (max-width: 480px) {
  #section .stats-grid {
    grid-template-columns: 1fr;
  }
  
  #section .filter-btn {
    padding: 8px 16px;
    font-size: 0.9rem;
  }
}

#section .fade-in {
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
  transform: translateY(30px);
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}