/* 添加缺失的样式定义 */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 3rem 0 1.5rem;
}

.section-title-text {
  font-size: 2rem;
  font-weight: 800;
  color: var(--dark);
  margin: 0;
  position: relative;
  padding-bottom: 10px;
}

.section-title-text::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
}

.view-all-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  padding: 5px 10px;
  border-radius: 20px;
  background: var(--gray-100);
}

.view-all-link:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* Category Navigation */
.category-navigation {
  margin: 3rem 0;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 20px;
  margin-top: 1.5rem;
}

.category-card {
  background: white;
  border-radius: var(--border-radius);
  padding: 20px;
  text-align: center;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.category-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--box-shadow-lg);
}

.category-icon {
  font-size: 2rem;
  margin-bottom: 15px;
}

.category-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  margin: 0;
}

/* Featured Carousel */
.featured-carousel {
  position: relative;
  margin: 2rem 0 4rem;
}

.carousel-container {
  overflow: hidden;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow-lg);
}

.carousel-wrapper {
  display: flex;
  transition: transform 0.5s ease-in-out;
}

.carousel-slide {
  min-width: 100%;
}

/* 添加卡片链接样式 */
.featured-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.featured-card {
  display: flex;
  background: white;
  min-height: 400px;
}

.card-image {
  flex: 1;
  background-size: cover;
  background-position: center;
}

.card-content {
  flex: 1;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.card-category {
  display: inline-block;
  padding: 5px 12px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  font-size: 0.8rem;
  border-radius: 20px;
  margin-bottom: 15px;
  align-self: flex-start;
  font-weight: 600;
}

.card-title {
  font-size: 1.8rem;
  font-weight: 800;
  margin: 0 0 15px 0;
  color: var(--dark);
  line-height: 1.3;
}

.card-excerpt {
  color: var(--gray-600);
  line-height: 1.6;
  flex-grow: 1;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

.card-date {
  color: var(--gray-500);
  font-size: 0.9rem;
}

.read-more-btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border: none;
  border-radius: 30px;
  padding: 10px 20px;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  display: inline-block;
}

.read-more-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--box-shadow);
}

.carousel-controls {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 0 20px;
  pointer-events: none;
}

.carousel-btn {
  background: white;
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: bold;
  cursor: pointer;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  pointer-events: auto;
}

.carousel-btn:hover {
  background: var(--primary);
  color: white;
  transform: scale(1.1);
}

.carousel-indicators {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 20px;
}

.indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gray-300);
  cursor: pointer;
  transition: var(--transition);
}

.indicator.active {
  background: var(--primary);
  transform: scale(1.2);
}

/* 添加移动端优化样式 */
@media (max-width: 1200px) {
  .featured-card {
    flex-direction: column;
  }

  .card-image {
    height: 300px;
  }

  .card-content {
    flex: none;
    padding: 1.5rem;
  }

  .card-title {
    font-size: 1.5rem;
  }

  .category-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
}

@media (max-width: 992px) {
  .section-title-text {
    font-size: 1.6rem;
  }

  .category-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 15px;
  }

  .popular-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
  }

  .timeline-line {
    left: 30px;
  }

  .timeline-item,
  .timeline-item.right {
    left: 0;
    padding: 0 0 0 60px;
  }

  .timeline-item.right .timeline-dot,
  .timeline-item:not(.right) .timeline-dot {
    left: 20px;
    right: auto;
  }

  .newsletter-form {
    flex-direction: column;
  }

  .newsletter-input,
  .newsletter-btn {
    width: 100%;
  }

  .card-image {
    height: 250px;
  }
}

@media (max-width: 768px) {
  .stat-number {
    font-size: 1.5rem;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin: 2rem 0 1rem;
  }

  .view-all-link {
    align-self: flex-end;
  }

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

  .newsletter-title {
    font-size: 1.5rem;
  }

  .newsletter-description {
    font-size: 1.1rem;
  }

  .timeline-container {
    padding: 1rem 0;
  }

  .timeline-item,
  .timeline-item.right {
    width: calc(100% - 60px);
    padding: 0 0 0 50px;
  }

  .timeline-image {
    height: 150px;
  }

  .timeline-content {
    padding: 15px;
  }

  .timeline-title {
    font-size: 1.1rem;
  }

  /* 修复移动端分类导航显示问题 */
  .category-navigation {
    margin: 1.5rem 0;
  }

  /* 优化移动端分类导航 - 横向滚动 */
  .category-grid {
    display: flex;
    overflow-x: auto;
    gap: 15px;
    padding: 10px 0;
    scrollbar-width: none;
    -ms-overflow-style: none;
    margin-top: 1rem;
  }

  .category-grid::-webkit-scrollbar {
    display: none;
  }

  .category-card {
    min-width: 120px;
    padding: 15px 10px;
    flex: 0 0 auto;
  }

  .category-icon {
    font-size: 1.5rem;
    margin-bottom: 10px;
  }

  .category-name {
    font-size: 0.9rem;
  }

  /* 优化移动端精选文章区域 */
  .featured-card {
    flex-direction: column;
    min-height: 350px;
  }

  .card-content {
    padding: 1rem;
  }

  .card-title {
    font-size: 1.2rem;
  }

  .card-excerpt {
    font-size: 0.9rem;
    overflow: hidden;
  }

  .card-meta {
    align-items: flex-start;
    gap: 8px;
  }

  .read-more-btn {
    align-self: flex-start;
  }
}

@media (max-width: 576px) {
  .section-title-text {
    font-size: 1.4rem;
  }

  .carousel-btn {
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }

  .popular-image {
    height: 180px;
  }

  .popular-title {
    font-size: 1rem;
  }

  .timeline-item,
  .timeline-item.right {
    width: calc(100% - 50px);
    padding: 0 0 0 40px;
  }

  .timeline-dot {
    width: 16px;
    height: 16px;
    top: 15px;
  }

  .timeline-image {
    height: 130px;
  }

  .timeline-title {
    font-size: 1rem;
  }

  .newsletter-title {
    font-size: 1.3rem;
  }

  .newsletter-description {
    font-size: 0.9rem;
  }

  .newsletter-input {
    padding: 12px 15px;
    font-size: 0.9rem;
  }

  .newsletter-btn {
    padding: 12px;
    font-size: 0.9rem;
  }

  /* 进一步优化移动端分类导航 */
  .category-grid {
    gap: 10px;
  }

  .category-card {
    min-width: 90px;
    padding: 10px 6px;
  }

  .category-icon {
    font-size: 1.2rem;
    margin-bottom: 6px;
  }

  .category-name {
    font-size: 0.75rem;
  }

  /* 进一步优化移动端精选文章区域 */
  .featured-card {
    min-height: 300px;
  }

  .card-image {
    flex: 0 0 auto;
    height: 160px;
  }

  .card-content {
    padding: 0.8rem;
  }

  .card-title {
    font-size: 1rem;
  }

  .card-category {
    padding: 3px 10px;
    font-size: 0.7rem;
    margin-bottom: 8px;
  }

  .card-excerpt {
    font-size: 0.8rem;
    line-height: 1.5;
  }

  .card-date {
    font-size: 0.8rem;
  }

  .read-more-btn {
    padding: 8px 16px;
    font-size: 0.8rem;
  }
}

/* Popular Grid */
.popular-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 25px;
  margin-bottom: 40px;
}

.popular-card {
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  animation: fadeInUp 0.5s ease-out forwards;
  opacity: 0;
}

.popular-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--box-shadow-lg);
}

.popular-image {
  width: 100%;
  height: 200px;
  background-size: cover;
  background-position: center;
}

.popular-content {
  padding: 20px;
}

.popular-category {
  display: inline-block;
  padding: 4px 10px;
  background: linear-gradient(135deg, var(--accent), #ff9a3d);
  color: var(--dark);
  font-size: 0.7rem;
  border-radius: 15px;
  margin-bottom: 12px;
  font-weight: 600;
}

.popular-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 15px 0;
  color: var(--dark);
  line-height: 1.4;
}

.popular-meta {
  display: flex;
  justify-content: space-between;
  color: var(--gray-500);
  font-size: 0.85rem;
  padding-top: 15px;
  border-top: 1px solid var(--gray-200);
}

/* Timeline */
.timeline-container {
  position: relative;
  padding: 2rem 0;
  margin: 2rem 0 4rem;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(to bottom, var(--primary), var(--accent));
  transform: translateX(-50%);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  margin-bottom: 50px;
  width: 50%;
  padding: 0 40px;
  box-sizing: border-box;
}

.timeline-item.right {
  left: 50%;
  padding-left: 40px;
  padding-right: 0;
}

.timeline-dot {
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: white;
  border: 4px solid var(--primary);
  top: 20px;
  box-shadow: var(--box-shadow);
  z-index: 2;
}

.timeline-item:not(.right) .timeline-dot {
  right: -10px;
}

.timeline-item.right .timeline-dot {
  left: -10px;
}

.timeline-card {
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  display: block;
  text-decoration: none;
}

.timeline-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--box-shadow-lg);
}

.timeline-image {
  width: 100%;
  height: 180px;
  background-size: cover;
  background-position: center;
}

.timeline-content {
  padding: 20px;
}

.timeline-category {
  display: inline-block;
  padding: 4px 10px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  font-size: 0.7rem;
  border-radius: 15px;
  margin-bottom: 12px;
  font-weight: 600;
}

.timeline-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0 0 15px 0;
  color: var(--dark);
  line-height: 1.4;
}

.timeline-excerpt {
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: 20px;
}

.timeline-meta {
  display: flex;
  justify-content: space-between;
  color: var(--gray-500);
  font-size: 0.85rem;
  padding-top: 15px;
  border-top: 1px solid var(--gray-200);
}

/* 优化时间线在移动端的展示 */
@media (max-width: 992px) {
  .timeline-line {
    left: 30px;
  }

  .timeline-item,
  .timeline-item.right {
    width: 100%;
    left: 0;
    padding: 0 0 0 60px;
  }

  .timeline-item.right .timeline-dot,
  .timeline-item:not(.right) .timeline-dot {
    left: 20px;
    right: auto;
  }
}

@media (max-width: 768px) {
  .timeline-container {
    padding: 1rem 0;
  }

  .timeline-item,
  .timeline-item.right {
    padding: 0 0 0 50px;
  }

  .timeline-image {
    height: 150px;
  }

  .timeline-content {
    padding: 15px;
  }

  .timeline-title {
    font-size: 1.1rem;
  }
}

@media (max-width: 576px) {
  .timeline-item,
  .timeline-item.right {
    padding: 0 0 0 40px;
  }

  .timeline-dot {
    width: 16px;
    height: 16px;
    top: 15px;
  }

  .timeline-image {
    height: 130px;
  }

  .timeline-title {
    font-size: 1rem;
  }
}

/* Newsletter Section */
.newsletter-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: var(--border-radius);
  padding: 3rem 2rem;
  margin: 0.2rem 0;
  text-align: center;
  color: white;
}

.newsletter-content {
  max-width: 600px;
  margin: 0 auto;
}

.newsletter-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.newsletter-description {
  font-size: 1.1rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.newsletter-form {
  display: flex;
  gap: 10px;
  max-width: 500px;
  margin: 0 auto;
}

.newsletter-input {
  flex: 1;
  padding: 15px 20px;
  border: none;
  border-radius: 30px;
  font-size: 1rem;
  outline: none;
  color: #333;
}

.newsletter-btn {
  background: var(--accent);
  color: var(--dark);
  border: none;
  border-radius: 30px;
  padding: 0 25px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.newsletter-btn:hover {
  background: #ffc14d;
  transform: translateY(-2px);
}

/* Home Page Specific Responsive Design */