/* ========================================
   AI基础认知页专用样式文件
   版本: 2.0
   最后更新: 2026-05-13
======================================== */

/* ========== 知识层级卡片 ========== */
.level-card {
  border-top: 4px solid var(--primary-color);
}

/* ========== 知识点详情 ========== */
details summary {
  outline: none;
  font-weight: 600;
  color: var(--primary-color);
  cursor: pointer;
}

details summary:hover {
  text-decoration: underline;
}

/* ========== 折叠面板 ========== */
.accordion {
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.accordion-item {
  border-bottom: 1px solid var(--border-color);
}

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

.accordion-header {
  padding: var(--spacing-base) var(--spacing-lg);
  background: var(--bg-card);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  transition: background-color 0.3s ease;
}

.accordion-header:hover {
  background: var(--gray-light);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 var(--spacing-lg);
}

.accordion-content.active {
  max-height: 500px;
  padding: var(--spacing-lg);
}

.accordion-icon {
  transition: transform 0.3s ease;
}

.accordion-icon.rotate {
  transform: rotate(180deg);
}

/* ========== 移动端适配 ========== */
@media (max-width: 768px) {
  /* 页面标题区优化 */
  section.section[style*="linear-gradient"] {
    padding: var(--spacing-xl) 0 !important;
  }
  
  section.section[style*="linear-gradient"] h1 {
    font-size: var(--font-size-xl) !important;
    margin-bottom: var(--spacing-sm) !important;
  }
  
  section.section[style*="linear-gradient"] p {
    font-size: var(--font-size-base) !important;
  }
  
  /* 知识层级卡片优化 */
  .level-card {
    padding: var(--spacing-base);
  }
  
  /* details/summary 优化 */
  details summary {
    font-size: 14px;
    padding: 10px 0;
  }
  
  /* 折叠面板优化 */
  .accordion-header {
    padding: 12px 14px;
    font-size: 14px;
  }
  
  .accordion-content {
    padding: 0 14px;
  }
  
  .accordion-content.active {
    padding: 12px 14px;
    font-size: 13px;
    line-height: 1.6;
  }
  
  .accordion-icon {
    font-size: 14px;
  }
  
  /* Section 间距优化 */
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  .section-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
  }
  
  .section-subtitle {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  /* 页面标题区超小屏优化 */
  section.section[style*="linear-gradient"] {
    padding: var(--spacing-lg) 0 !important;
  }
  
  section.section[style*="linear-gradient"] h1 {
    font-size: var(--font-size-lg) !important;
  }
  
  section.section[style*="linear-gradient"] p {
    font-size: var(--font-size-sm) !important;
  }
  
  /* 知识层级卡片优化 */
  .level-card {
    padding: var(--spacing-sm);
  }
  
  /* details/summary 优化 */
  details summary {
    font-size: 13px;
    padding: 8px 0;
  }
  
  /* 折叠面板优化 */
  .accordion-header {
    padding: 10px 12px;
    font-size: 13px;
  }
  
  .accordion-content.active {
    padding: 10px 12px;
    font-size: 12px;
  }
  
  /* Section 间距优化 */
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  .section-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-base);
  }
  
  .section-subtitle {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-base);
  }
}

/* ========== 筛选和搜索工具栏 ========== */
.knowledge-toolbar {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-base);
  padding: var(--spacing-lg);
  background: var(--bg-card);
  border-radius: var(--border-radius);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  margin-bottom: var(--spacing-lg);
}

.filter-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.filter-label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--font-size-base);
  margin-right: var(--spacing-xs);
}

.filter-btn {
  padding: 8px 18px;
  border: 2px solid var(--border-color);
  background: white;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  min-width: 80px;
}

.filter-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(102, 126, 234, 0.2);
}

.filter-btn.active {
  background: linear-gradient(135deg, var(--primary-color), #764ba2);
  border-color: var(--primary-color);
  color: white;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.search-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

.search-group input {
  flex: 1;
  max-width: none;
  padding: 10px 16px;
  border: 2px solid var(--border-color);
  border-radius: 25px;
  font-size: var(--font-size-base);
  transition: all 0.3s ease;
}

.search-group input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
  outline: none;
}

.search-group .btn {
  padding: 10px 24px;
  border-radius: 25px;
  font-weight: 600;
  white-space: nowrap;
}

/* ========== 学习进度统计 ========== */
.progress-stats {
  transition: all 0.3s ease;
}

.progress-stats:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.stat-item {
  text-align: center;
  min-width: 80px;
}

/* ========== 已读知识点高亮 ========== */
.read-knowledge {
  border-left: 4px solid var(--success-color);
  background: linear-gradient(to right, rgba(16, 185, 129, 0.05), transparent);
}

/* ========== 搜索结果高亮 ========== */
.search-highlight {
  background: yellow;
  color: black;
  padding: 2px 4px;
  border-radius: 3px;
}

/* ========== 移动端适配 ========== */
@media (max-width: 768px) {
  .knowledge-toolbar {
    padding: var(--spacing-base);
  }
  
  .filter-group {
    gap: var(--spacing-xs);
  }
  
  .filter-label {
    font-size: var(--font-size-sm);
    width: 100%;
    text-align: center;
    margin-bottom: var(--spacing-xs);
  }
  
  .filter-btn {
    padding: 6px 14px;
    font-size: 13px;
    min-width: 70px;
  }
  
  .search-group {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .search-group input {
    width: 100%;
  }
  
  .search-group .btn {
    width: 100%;
  }
  
  .progress-stats > div:first-child {
    flex-direction: column;
    text-align: center;
  }
  
  .progress-stats > div:last-child {
    justify-content: center;
  }
  
  .stat-item {
    min-width: 60px;
  }
  
  .stat-item span:first-child {
    font-size: var(--font-size-xl) !important;
  }
}

@media (max-width: 480px) {
  .filter-btn {
    padding: 5px 12px;
    font-size: 12px;
    min-width: 65px;
  }
  
  .stat-item {
    min-width: 50px;
  }
  
  .stat-item span:first-child {
    font-size: var(--font-size-lg) !important;
  }
}

/* ========== 分页控件 ========== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg) 0;
  flex-wrap: wrap;
}

.pagination-btn {
  padding: var(--spacing-sm) var(--spacing-base);
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-main);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: var(--font-size-base);
  font-weight: 500;
  min-width: 40px;
}

.pagination-btn:hover:not(:disabled) {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(102, 126, 234, 0.2);
}

.pagination-btn.active {
  background: linear-gradient(135deg, var(--primary-color), #764ba2);
  color: white;
  border-color: var(--primary-color);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.pagination-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.pagination-ellipsis {
  color: var(--text-light);
  font-size: var(--font-size-lg);
  padding: 0 var(--spacing-xs);
}

/* 移动端分页适配 */
@media (max-width: 768px) {
  .pagination {
    gap: var(--spacing-xs);
  }
  
  .pagination-btn {
    padding: 6px 12px;
    font-size: 13px;
    min-width: 35px;
  }
}

@media (max-width: 480px) {
  .pagination-btn {
    padding: 5px 10px;
    font-size: 12px;
    min-width: 32px;
  }
}