/* About页面样式 */

.about-section {
  min-height: 100vh;
  padding: 100px 20px 60px;
  background-color: var(--bg-color);
}

/* 页面标题 */
.page-header {
  text-align: center;
  margin-bottom: 60px;
}

.page-header h1 {
  font-size: clamp(36px, 6vw, 48px);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  line-height: 1.2;
}

.page-subtitle {
  font-size: clamp(18px, 3vw, 22px);
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.5;
}

/* 内容卡片 */
.content-card {
  background: white;
  border-radius: 16px;
  padding: 40px;
  box-shadow: var(--shadow-md);
  margin-bottom: 30px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.content-card h2 {
  font-size: 28px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  line-height: 1.3;
}

.content-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 12px;
}

.content-card h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.content-card p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: 20px;
}

/* 症状网格 */
.symptoms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 30px;
}

.symptom-item {
  background: #f8fafc;
  padding: 24px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.symptom-item h3 {
  color: var(--primary-color);
  margin-bottom: 16px;
}

.symptom-item ul {
  list-style: none;
  padding: 0;
}

.symptom-item li {
  padding: 8px 0;
  position: relative;
  padding-left: 24px;
  color: var(--text-secondary);
}

.symptom-item li::before {
  content: '•';
  position: absolute;
  left: 8px;
  color: var(--primary-color);
  font-weight: bold;
}

/* 维度列表 */
.dimensions-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.dimension-item {
  background: #f0f9ff;
  padding: 20px;
  border-radius: 12px;
  border: 1px solid #bfdbfe;
}

.dimension-item h4 {
  color: #1e40af;
  margin-bottom: 10px;
  font-size: 16px;
}

.dimension-item p {
  font-size: 14px;
  margin-bottom: 0;
  color: var(--text-secondary);
}

/* 好处网格 */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 30px;
}

.benefit-item {
  text-align: center;
  padding: 30px 20px;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border-radius: 12px;
  transition: transform 0.3s ease;
}

.benefit-item:hover {
  transform: translateY(-5px);
}

.benefit-item h3 {
  color: #0369a1;
  margin-bottom: 12px;
  font-size: 18px;
}

.benefit-item p {
  color: #0c4a6e;
  font-size: 15px;
  margin-bottom: 0;
}

/* 免责声明 */
.disclaimer {
  background: #fffbeb;
  border: 1px solid #fed7aa;
}

.disclaimer h2 {
  color: #92400e;
}

.disclaimer p {
  color: #78350f;
  font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .content-card {
    padding: 30px 20px;
  }

  .symptoms-grid {
    grid-template-columns: 1fr;
  }

  .dimensions-list {
    grid-template-columns: 1fr;
  }

  .benefits-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .benefit-item {
    padding: 24px 16px;
  }
}

@media (max-width: 640px) {
  .about-section {
    padding: 100px 15px 40px;
  }

  .page-header {
    margin-bottom: 40px;
  }

  .content-card {
    padding: 24px 16px;
    margin-bottom: 20px;
  }

  .content-card h2 {
    font-size: 24px;
  }
}

/* 动画 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.content-card {
  animation: fadeIn 0.6s ease forwards;
  opacity: 0;
}

.content-card:nth-child(1) { animation-delay: 0.1s; }
.content-card:nth-child(2) { animation-delay: 0.2s; }
.content-card:nth-child(3) { animation-delay: 0.3s; }
.content-card:nth-child(4) { animation-delay: 0.4s; }
.content-card:nth-child(5) { animation-delay: 0.5s; }
.content-card:nth-child(6) { animation-delay: 0.6s; }