.courses-section {
  
}
/*padding: var(--spacing-xl) 0;margin-bottom: var(--spacing-xxl);*/
.section-block {
  
}

.section-block:last-child {
  margin-bottom: 0;
}

.section-block-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-xl);
  font-weight: 600;
  color: var(--black);
  margin-bottom: var(--spacing-xs);
}

.section-block-desc {
  font-size: var(--font-md);
  color: var(--gray);
  margin-bottom: var(--spacing-lg);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.course-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.course-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.course-image {
  position: relative;
  width: 100%;
  height: 300px;
  overflow: hidden;
}

.course-image img {
  width: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.course-card:hover .course-image img {
  transform: scale(1.05);
}

.course-badge {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
  color: var(--white);
  font-size: var(--font-xs);
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  z-index: 1;
}

.course-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(26, 35, 126, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.course-card:hover .course-overlay {
  opacity: 1;
}

.view-detail {
  color: var(--white);
  font-size: var(--font-md);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--white);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.view-detail:hover {
  background: var(--white);
  color: var(--primary-blue);
}

.course-info {
  padding: var(--spacing-md);
}

.course-date {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--gray);
  font-size: var(--font-sm);
  margin-bottom: var(--spacing-sm);
}

.course-date svg {
  fill: var(--secondary-blue);
}

.course-title {
  font-size: var(--font-xl);
  font-weight: 600;
  color: var(--black);
  margin-bottom: var(--spacing-xs);
}

.course-desc {
  font-size: var(--font-sm);
  color: var(--dark-gray);
  line-height: 1.6;
}

.image-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
}

.image-modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.9);
}

.modal-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.modal-close {
  position: absolute;
  top: -40px;
  right: 0;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  transition: transform var(--transition-fast);
}

.modal-close:hover {
  transform: scale(1.1);
}

.modal-image {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.modal-info {
  color: var(--white);
  text-align: center;
  padding: var(--spacing-md);
  font-size: var(--font-md);
}

@media (max-width: 768px) {
  .section-block-title {
    font-size: var(--font-lg);
  }

  .courses-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .course-image {
    height: 180px;
  }

  .course-title {
    font-size: var(--font-lg);
  }

  .modal-content {
    max-width: 95vw;
  }

  .modal-image {
    max-height: 70vh;
  }
}

/* 错误信息和无课程提示 */
.error-message,
.no-courses {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-size: var(--font-md);
}

.error-message {
  background: rgba(220, 53, 69, 0.1);
  color: #dc3545;
  border: 1px solid rgba(220, 53, 69, 0.3);
}

.no-courses {
  background: rgba(108, 117, 125, 0.1);
  color: #6c757d;
  border: 1px solid rgba(108, 117, 125, 0.3);
}