/* 基础样式重置 */
* {
  box-sizing: border-box;
}

/* 搜索框容器样式 */
.search-container {
  margin-bottom: 30px;
  padding: 20px 0;
}

/* 搜索框样式 */
.search-box {
  display: flex;
  max-width: 500px;
  border: 2px solid var(--border-color);
  border-radius: 5px;
  overflow: hidden;
  background: var(--bg-color);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.search-input {
  flex: 1;
  padding: 12px 16px;
  border: none;
  outline: none;
  font-size: 14px;
  color: var(--text-color);
  background: transparent;
}

.search-input::placeholder {
  color: var(--text-light);
  font-size: 14px;
}

.search-btn {
  padding: 12px 20px;
  background: var(--danger-color);
  color: var(--text-white);
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background-color 0.3s ease;
  border-radius: 0 5px 5px 0;
}

.search-btn:hover {
  background: var(--danger-hover);
}

.search-btn:disabled,
.search-btn.disabled {
  background-color: #ccc;
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.6;
}

.search-btn:disabled:hover,
.search-btn.disabled:hover {
  background-color: #ccc;
  transform: none;
}

.clear-btn {
  padding: 12px 16px;
  background: #f7fafc;
  color: var(--text-muted);
  border: none;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background-color 0.3s ease;
}

.clear-btn:hover {
  background: #edf2f7;
}

.clear-icon {
  font-size: 14px;
}

/* 筛选下拉菜单样式 */
.filter-dropdown {
  border-left: 1px solid var(--border-color);
  background: var(--bg-color);
}

.price-filter {
  padding: 12px 16px;
  border: none;
  outline: none;
  font-size: 14px;
  color: var(--text-color);
  background: transparent;
  cursor: pointer;
  min-width: 120px;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 8px center;
  background-size: 16px;
  padding-right: 32px;
}

.price-filter:hover {
  background-color: #f8f9fa;
}

.price-filter:focus {
  background-color: #f8f9fa;
}

/* 下拉菜单选项样式 */
.price-filter option {
  padding: 8px 12px;
  font-size: 14px;
  color: var(--text-color);
  background: var(--bg-color);
}

.price-filter option:hover {
  background: var(--danger-color);
  color: var(--text-white);
}

/* 课程列表样式 */
.course-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 20px;
  justify-content: flex-start;
}

.course-item {
  background: var(--bg-color);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  z-index: 1;
}

.course-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  z-index: 2;
}

/* 课程缩略图样式 */
.course-thumbnail {
  height: 160px;
}

.course-thumbnail img {
  height: 100%;
}

/* 课程内容区域 */
.course-content {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.course-name {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 10px 0;
  color: var(--text-color);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  height: auto;
  min-height: 44px;
}

.course-description {
  font-size: 14px;
  color: var(--text-muted);
  margin: 0 0 15px 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}

.course-metadata {
  margin-top: auto;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

.sidebar-title {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 20px 0;
  color: var(--text-color);
}

/* 课程链接样式 */
.course-link {
  flex: 0 0 calc(33.333% - 14px);
  min-width: 250px;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: transform 0.2s ease;
}

.course-link:hover {
  text-decoration: none;
  color: inherit;
  transform: translateY(-2px);
}

.course-link:hover .course-item {
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* 标签搜索样式 */
.label-search-container {
  margin-bottom: 30px;
  padding: 16px;
  background: var(--bg-color);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.label-search-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.label-search-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-color);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.label-search-controls {
  display: flex;
  gap: 10px;
  align-items: center;
}

.label-control-btn {
  padding: 8px 16px;
  border: 1px solid var(--border-color);
  border-radius: 5px;
  background: var(--bg-color);
  color: var(--text-color);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

.label-control-btn:hover {
  background: #f8f9fa;
  border-color: var(--primary-color);
}

.label-control-btn.primary {
  background: var(--danger-color);
  color: var(--text-white);
  border-color: var(--danger-color);
}

.label-control-btn.primary:hover {
  background: var(--danger-hover);
  border-color: var(--danger-hover);
}

.label-control-btn.secondary {
  background: #f7fafc;
  color: var(--text-muted);
  border-color: #e2e8f0;
}

.label-control-btn.secondary:hover {
  background: #edf2f7;
  color: var(--text-color);
}

.label-search-content {
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
}

.label-loading {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 40px 20px;
  color: var(--text-muted);
  font-size: 16px;
}

.label-loading::after {
  content: "";
  width: 20px;
  height: 20px;
  margin-left: 10px;
  border: 2px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: course-spin 1s linear infinite;
}

.label-categories {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.label-category {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 6px;
  padding: 16px;
}

.label-category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  cursor: pointer;
  user-select: none;
  min-width: 0; /* 允许flex子项缩小 */
  gap: 12px; /* 标题和切换按钮之间的间距 */
}

.label-category-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-color);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1; /* 占据可用空间 */
  min-width: 0; /* 允许缩小 */
}

/* 分类名称文字部分 */
.category-name {
  overflow: hidden; /* 隐藏超出内容 */
  white-space: nowrap; /* 单行显示 */
  text-overflow: ellipsis; /* 显示省略号 */
  flex: 1; /* 占据剩余空间 */
  min-width: 0; /* 允许缩小 */
}

.label-category-toggle {
  font-size: 14px;
  color: var(--text-muted);
  transition: transform 0.3s ease;
  flex-shrink: 0; /* 防止折叠箭头被压缩 */
}

.label-category.collapsed .label-category-toggle {
  transform: rotate(-90deg);
}

.label-category-count {
  font-size: 12px;
  color: var(--text-muted);
  background: #e9ecef;
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: 8px;
  flex-shrink: 0; /* 防止数字被压缩 */
}

.label-items {
  display: grid;
  grid-template-columns: repeat(2, 1fr); /* 改为2列以适应英文标签 */
  gap: 6px;
  transition: all 0.3s ease;
}

.label-category.collapsed .label-items {
  display: none;
}

.label-item {
  display: flex;
  align-items: center;
  padding: 10px 12px; /* 增加padding为英文文本提供更多空间 */
  background: var(--bg-color);
  border: 1px solid #e9ecef;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
  min-height: 40px; /* 增加高度以容纳英文文本 */
  /* 确保flex容器不会溢出 */
  overflow: hidden;
  min-width: 0; /* 允许flex子元素缩小 */
}

.label-item:hover {
  background: #f1f3f4;
  border-color: var(--primary-color);
}

.label-item.selected {
  background: #e3f2fd;
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.label-checkbox {
  display: flex;
  align-items: center;
  margin-right: 6px;
  cursor: pointer;
}

.label-checkbox input[type="checkbox"] {
  margin: 0;
  cursor: pointer;
  vertical-align: middle;
}

.label-text {
  font-size: 13px;
  line-height: 1.4; /* 增加行高以适应英文文本 */
  flex: 1;
  cursor: pointer;
  /* 文本溢出处理 - 关键修复 */
  overflow: hidden; /* 隐藏超出内容 */
  white-space: nowrap; /* 单行显示 */
  text-overflow: ellipsis; /* 显示省略号 */
  min-width: 0; /* 允许缩小 - 这是关键！ */
  max-width: 100%; /* 确保不超过父容器 */
}

.label-search-summary {
  margin-top: 20px;
  padding: 12px 16px;
  background: #f1f3f4;
  border-radius: 5px;
  border-left: 4px solid var(--primary-color);
}

.selected-count {
  font-size: 14px;
  color: var(--text-color);
  font-weight: 500;
}

/* 选中标签显示区域 */
.selected-tags-display {
  margin-bottom: 16px;
  padding: 12px;
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 6px;
  border-left: 3px solid var(--primary-color);
}

.selected-tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.selected-tag-item {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  background: var(--primary-color);
  color: var(--text-white);
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  gap: 4px;
  transition: all 0.3s ease;
}

.selected-tag-item:hover {
  background: var(--danger-color);
  transform: scale(1.05);
}

.selected-tag-text {
  line-height: 1;
}

.selected-tag-close {
  cursor: pointer;
  font-size: 14px;
  font-weight: bold;
  line-height: 1;
  opacity: 0.8;
  transition: opacity 0.3s ease;
}

.selected-tag-close:hover {
  opacity: 1;
}

/* 响应式布局 */
@media (max-width: 1200px) {
  .course-item {
    flex: 1 1 calc(33.333% - 13.333px);
  }
}

@media (max-width: 768px) {
  .course-item {
    flex: 1 1 calc(50% - 10px);
  }

  .search-box {
    max-width: 100%;
    margin: 0;
  }

  /* 标签搜索移动端适配 */
  .label-search-container {
    padding: 15px;
    margin-bottom: 20px;
  }

  .label-search-header {
    flex-direction: column;
    align-items: stretch;
    gap: 15px;
  }

  .label-search-controls {
    justify-content: center;
    flex-wrap: wrap;
  }

  .label-control-btn {
    flex: 1;
    min-width: 80px;
    justify-content: center;
  }

  .label-items {
    grid-template-columns: repeat(2, 1fr);
  }

  .label-category {
    padding: 12px;
  }

  .label-category-title {
    font-size: 15px;
  }

  .label-item {
    padding: 10px 12px;
  }
}

@media (max-width: 576px) {
  .course-item {
    flex: 1 1 100%;
  }

  .search-box {
    flex-direction: column;
    border-radius: 15px;
    /* 移动端使用较小的圆角 */
  }

  .search-btn,
  .clear-btn {
    border-radius: 0 0 13px 13px;
    /* 移动端按钮圆角 */
  }

  /* 标签搜索小屏幕适配 */
  .label-search-container {
    padding: 12px;
    border-radius: 6px;
  }

  .label-search-title {
    font-size: 16px;
    text-align: center;
  }

  .label-search-controls {
    gap: 8px;
  }

  .label-control-btn {
    padding: 10px 12px;
    font-size: 13px;
  }

  .label-category {
    padding: 10px;
  }

  .label-category-title {
    font-size: 14px;
  }

  .label-items {
    grid-template-columns: 1fr;
  }

  .label-item {
    padding: 12px 10px;
  }

  .label-text {
    font-size: 13px;
  }

  .label-search-summary {
    padding: 10px 12px;
  }

  .selected-count {
    font-size: 13px;
  }
}

/* 过滤配置相关样式 */
.label-controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

.filter-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.filter-modal-content {
  background: white;
  border-radius: 8px;
  width: 90%;
  max-width: 600px;
  max-height: 80%;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.filter-modal-header {
  background: #f8f9fa;
  padding: 15px 20px;
  border-bottom: 1px solid #dee2e6;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.filter-modal-header h4 {
  margin: 0;
  color: #333;
}

.filter-modal-close {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: #666;
  padding: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.filter-modal-close:hover {
  background: #e9ecef;
  color: #333;
}

.filter-modal-body {
  padding: 20px;
  max-height: 400px;
  overflow-y: auto;
}

.filter-section {
  margin-bottom: 20px;
}

.filter-section h5 {
  margin: 0 0 10px 0;
  color: #495057;
  font-size: 14px;
}

.filter-item {
  display: flex;
  align-items: center;
  padding: 6px 0;
  border-bottom: 1px solid #f1f3f4;
}

.filter-item:last-child {
  border-bottom: none;
}

.filter-item input[type="checkbox"] {
  margin-right: 8px;
}

.filter-item-name {
  flex: 1;
  font-size: 13px;
  color: #333;
}

.filter-item-info {
  font-size: 11px;
  color: #666;
  margin-left: auto;
}

.filter-modal-footer {
  background: #f8f9fa;
  padding: 15px 20px;
  border-top: 1px solid #dee2e6;
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

.filter-btn {
  padding: 8px 16px;
  border: 1px solid #dee2e6;
  border-radius: 4px;
  background: white;
  color: #495057;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s;
}

.filter-btn:hover {
  background: #f8f9fa;
}

.filter-btn.primary {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.filter-btn.primary:hover {
  background: #0056b3;
  border-color: #0056b3;
}

.filter-btn.secondary {
  background: #6c757d;
  color: white;
  border-color: #6c757d;
}

.filter-btn.secondary:hover {
  background: #5a6268;
  border-color: #5a6268;
}