/* ==================== 幫助中心 V2 樣式 ==================== */

/* 页面基础设置 */
.help-page {
  margin: 0;
  padding: 0;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  /* 性能优化：限制渲染范围 */
  contain: layout style paint;
}

/* ==================== 顶部导航栏 ==================== */
.help-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.back-btn,
.refresh-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 18px;
  transition: all 0.3s;
}

.back-btn:hover,
.refresh-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.refresh-btn:active {
  transform: rotate(180deg);
}

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

.help-search {
  flex: 1;
  max-width: 500px;
  position: relative;
  display: flex;
  align-items: center;
}

.help-search i {
  position: absolute;
  left: 12px;
  color: var(--text-secondary);
  font-size: 14px;
}

.help-search input {
  width: 100%;
  padding: 10px 12px 10px 36px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 14px;
}

.help-search input:focus {
  outline: none;
  border-color: var(--primary-color);
}

.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 18px;
}

/* ==================== 主容器 ==================== */
.help-main-container {
  flex: 1;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 0;
  min-height: calc(100vh - 72px - 200px);
}

/* ==================== 左侧导航 ==================== */
.help-sidebar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 20px 0;
  /* 性能优化：启用硬件加速滚动 */
  -webkit-overflow-scrolling: touch;
  /* 性能优化：限制渲染范围 */
  contain: layout style paint;
}

.sidebar-category {
  margin-bottom: 8px;
}

.category-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
}

.category-header.active {
  color: var(--primary-color);
}

.category-header span {
  display: flex;
  align-items: center;
  gap: 10px;
}

.category-header i.fa-chevron-down {
  font-size: 12px;
  color: var(--text-secondary);
}

.category-header.active i.fa-chevron-down {
  transform: rotate(180deg);
}

.category-items {
  display: none;
  padding: 0 0 8px 0;
}

.category-items.active {
  display: block;
}

.category-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px 10px 48px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  text-align: left;
}

.category-item.active {
  background: var(--bg-tertiary);
  color: var(--primary-color);
  font-weight: 500;
}

.category-item i {
  font-size: 13px;
  width: 16px;
  text-align: center;
}

/* ==================== 内容区域 ==================== */
.help-content-area {
  padding: 24px 40px;
  overflow-y: auto;
  /* 性能优化：启用硬件加速滚动 */
  -webkit-overflow-scrolling: touch;
  /* 性能优化：限制渲染范围 */
  contain: layout style;
}

/* 面包屑导航 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--text-secondary);
}

.breadcrumb a {
  color: var(--primary-color);
  text-decoration: none;
}

.breadcrumb i {
  font-size: 10px;
}

/* FAQ 内容 */
.faq-content {
  max-width: 900px;
}

.faq-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--border-color);
}

.faq-title i {
  color: var(--primary-color);
  font-size: 26px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  /* 性能优化：优化长列表渲染 */
  content-visibility: auto;
  contain-intrinsic-size: auto 100px;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
  /* 重置button样式 */
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.2s;
}

.faq-question:hover {
  background-color: var(--bg-tertiary);
}

.faq-question span {
  flex: 1;
  padding-right: 12px;
}

.faq-question i {
  color: var(--text-secondary);
  font-size: 14px;
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding: 0 20px 20px;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-answer p {
  margin: 0 0 12px 0;
  line-height: 1.6;
  color: var(--text-secondary);
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

.faq-answer strong {
  color: var(--text-primary);
  font-weight: 600;
}

.faq-answer ul,
.faq-answer ol {
  margin: 12px 0;
  padding-left: 24px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.faq-answer li {
  margin-bottom: 8px;
}

.faq-answer li:last-child {
  margin-bottom: 0;
}

.faq-answer a {
  color: var(--primary-color);
  text-decoration: none;
}

/* 搜索结果为空 */
.no-results {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.no-results i {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.no-results p {
  font-size: 16px;
  margin: 0;
}

/* ==================== 页脚 ==================== */
.help-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 24px 24px;
  margin-top: auto;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.footer-column h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 16px 0;
}

.footer-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-column li {
  margin-bottom: 12px;
}

.footer-column a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-column a i {
  font-size: 14px;
  width: 16px;
}

.copyright {
  margin-top: 24px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* ==================== 响应式设计 ==================== */

@media (max-width: 968px) {
  .help-main-container {
    grid-template-columns: 1fr;
  }
  
  .help-sidebar {
    display: none;
  }
  
  .help-content-area {
    padding: 20px 24px;
  }
  
  .footer-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 640px) {
  .help-header {
    padding: 12px 16px;
    gap: 12px;
  }
  
  .help-title {
    font-size: 16px;
  }
  
  .help-search {
    display: none;
  }
  
  .help-content-area {
    padding: 16px;
  }
  
  .faq-title {
    font-size: 20px;
  }
  
  .faq-question {
    padding: 14px 16px;
    font-size: 14px;
  }
  
  .faq-answer {
    padding: 0 16px 16px;
    font-size: 14px;
  }
  
  .footer-container {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* ==================== 加载状态 ==================== */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.loading i {
  font-size: 36px;
  margin-bottom: 16px;
  color: var(--primary-color);
}

.loading p {
  font-size: 14px;
  margin: 0;
}

/* ==================== 错误提示 ==================== */
.error-message {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
}

.error-message i {
  font-size: 48px;
  margin-bottom: 20px;
  color: var(--error-color, #e74c3c);
}

.error-message p {
  font-size: 16px;
  color: var(--text-secondary);
  margin: 0 0 20px;
}

.error-message button {
  padding: 10px 24px;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.3s;
}

.error-message button:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* ==================== 无搜索结果 ==================== */
.no-results {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
  color: var(--text-secondary);
}

.no-results i {
  font-size: 48px;
  margin-bottom: 20px;
  opacity: 0.5;
}

.no-results p {
  font-size: 16px;
  margin: 0;
}

.no-results .hint {
  font-size: 14px;
  margin-top: 8px;
  opacity: 0.7;
}

/* ==================== 搜索信息 ==================== */
.search-info {
  padding: 16px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
  border-top: 1px solid var(--border-color);
  margin-top: 24px;
}

/* ==================== 页脚内容页 ==================== */
.footer-content {
  padding: 24px 0;
  line-height: 1.8;
}

.footer-content h3 {
  color: var(--text-primary);
  font-size: 20px;
  margin: 32px 0 16px;
}

.footer-content h3:first-child {
  margin-top: 0;
}

.footer-content p {
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.footer-content ul {
  list-style: disc;
  margin-left: 24px;
  margin-bottom: 16px;
}

.footer-content li {
  margin-bottom: 8px;
  color: var(--text-secondary);
}

/* ==================== 最后更新日期 ==================== */
.last-updated {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 12px;
  color: var(--text-tertiary);
  font-style: italic;
}

.last-updated::before {
  content: '📅 ';
  margin-right: 4px;
}

[data-theme="dark"] .last-updated {
  color: rgba(255, 255, 255, 0.4);
}

[data-theme="light"] .last-updated {
  color: rgba(0, 0, 0, 0.4);
}