/**
 * 尘渊文化 - SEO增强样式
 * SEO Enhancements - FAQ, Breadcrumbs, Structured Content
 * @version 1.0.0
 */

/* ========== FAQ样式 ========== */
.faq-section {
  padding: 80px 0;
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(144, 202, 249, 0.3);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.faq-question {
  padding: 24px 32px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--md-sys-color-on-surface);
  transition: color 0.3s ease;
}

.faq-question:hover {
  color: var(--md-sys-color-primary);
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--md-sys-color-primary);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 32px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  padding: 0 32px 24px;
  max-height: 500px;
}

/* ========== 面包屑导航 ========== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 0.875rem;
  color: var(--md-sys-color-on-surface-variant);
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--md-sys-color-on-surface-variant);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumb a:hover {
  color: var(--md-sys-color-primary);
}

.breadcrumb-separator {
  color: var(--md-sys-color-outline);
}

.breadcrumb-current {
  color: var(--md-sys-color-on-surface);
  font-weight: 500;
}

/* ========== 文章样式优化 ========== */
.article-content {
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.8;
}

.article-content h1 {
  font-size: 2.5rem;
  margin-bottom: 24px;
  line-height: 1.3;
}

.article-content h2 {
  font-size: 1.75rem;
  margin-top: 48px;
  margin-bottom: 20px;
  color: var(--md-sys-color-primary);
}

.article-content h3 {
  font-size: 1.375rem;
  margin-top: 32px;
  margin-bottom: 16px;
}

.article-content p {
  margin-bottom: 20px;
  color: var(--md-sys-color-on-surface-variant);
}

.article-content ul,
.article-content ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-content li {
  margin-bottom: 8px;
}

.article-content blockquote {
  border-left: 4px solid var(--md-sys-color-primary);
  padding-left: 24px;
  margin: 32px 0;
  font-style: italic;
  color: var(--md-sys-color-on-surface-variant);
}

.article-content code {
  background: var(--md-sys-color-surface-container-high);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.9em;
}

.article-content pre {
  background: var(--md-sys-color-surface-container-high);
  padding: 24px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 24px 0;
}

.article-content pre code {
  background: none;
  padding: 0;
}

/* ========== 目录导航 ========== */
.toc {
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 32px 0;
}

.toc-title {
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--md-sys-color-on-surface);
}

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

.toc li {
  margin: 8px 0;
}

.toc a {
  color: var(--md-sys-color-on-surface-variant);
  text-decoration: none;
  transition: color 0.2s ease;
  display: block;
  padding: 4px 0;
}

.toc a:hover {
  color: var(--md-sys-color-primary);
}

.toc .toc-h2 {
  padding-left: 0;
}

.toc .toc-h3 {
  padding-left: 20px;
  font-size: 0.9em;
}

/* ========== 阅读进度条 ========== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, #90caf9, #64b5f6, #42a5f5);
  z-index: 10000;
  transition: width 0.1s ease;
}

/* ========== 作者信息卡片 ========== */
.author-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px;
  background: var(--md-sys-color-surface-container);
  border-radius: var(--radius-lg);
  margin: 48px 0;
  border: 1px solid var(--md-sys-color-outline-variant);
}

.author-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--md-sys-color-primary), var(--md-sys-color-tertiary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: white;
  font-weight: 700;
}

.author-info h4 {
  margin: 0 0 4px 0;
  font-size: 1.125rem;
}

.author-info p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--md-sys-color-on-surface-variant);
}

/* ========== 相关文章推荐 ========== */
.related-articles {
  margin-top: 64px;
  padding-top: 48px;
  border-top: 1px solid var(--md-sys-color-outline-variant);
}

.related-articles h3 {
  margin-bottom: 24px;
  font-size: 1.5rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.related-card {
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
}

.related-card:hover {
  transform: translateY(-4px);
  border-color: var(--md-sys-color-primary);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.related-card h4 {
  margin: 0 0 12px 0;
  font-size: 1.125rem;
  color: var(--md-sys-color-on-surface);
}

.related-card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.6;
}

/* ========== 标签云 ========== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background: rgba(144, 202, 249, 0.1);
  border: 1px solid rgba(144, 202, 249, 0.2);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--md-sys-color-primary);
  text-decoration: none;
  transition: all 0.2s ease;
}

.tag-item:hover {
  background: rgba(144, 202, 249, 0.2);
  border-color: rgba(144, 202, 249, 0.4);
  transform: translateY(-2px);
}

/* ========== 分享按钮 ========== */
.share-section {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 48px 0;
  padding: 24px 0;
  border-top: 1px solid var(--md-sys-color-outline-variant);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}

.share-title {
  font-weight: 600;
  color: var(--md-sys-color-on-surface);
}

.share-buttons {
  display: flex;
  gap: 12px;
}

.share-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 1.125rem;
}

.share-btn:hover {
  background: var(--md-sys-color-primary);
  border-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  transform: translateY(-2px);
}

/* ========== 搜索高亮 ========== */
.search-highlight {
  background: rgba(144, 202, 249, 0.3);
  padding: 2px 4px;
  border-radius: 4px;
}

/* ========== 打印优化 ========== */
@media print {
  .breadcrumb,
  .share-section,
  .reading-progress,
  .toc {
    display: none;
  }
  
  .article-content {
    max-width: 100%;
  }
  
  body {
    background: white;
    color: black;
  }
}

/* ========== 移动端优化 ========== */
@media (max-width: 768px) {
  .faq-question {
    padding: 20px 24px;
    font-size: 1rem;
  }
  
  .faq-answer {
    padding: 0 24px;
  }
  
  .faq-item.active .faq-answer {
    padding: 0 24px 20px;
  }
  
  .breadcrumb {
    font-size: 0.8125rem;
    padding: 12px 0;
  }
  
  .article-content h1 {
    font-size: 1.875rem;
  }
  
  .article-content h2 {
    font-size: 1.375rem;
  }
  
  .author-card {
    flex-direction: column;
    text-align: center;
  }
  
  .related-grid {
    grid-template-columns: 1fr;
  }
}