/* ============================================================
   奈云 NaiYun 文章页专属样式表 (article.css)
   为深度长文提供优雅的排版、清晰的目录、呼应的主题配色
   ============================================================ */

.article-header-section {
  padding: 48px 0 36px;
  background: #FFFFFF;
  border-bottom: 1px solid var(--border-light);
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.article-breadcrumb a {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.article-breadcrumb a:hover {
  color: var(--brand-blue);
}

.article-breadcrumb-sep {
  color: #CBD5E1;
}

.article-main-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.article-badge {
  background: var(--brand-blue-light);
  color: var(--brand-blue);
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
}

.article-layout-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  padding: 48px 0 80px;
  align-items: start;
}

/* 侧边悬浮目录与内链推荐 */
.article-sidebar {
  position: sticky;
  top: 96px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-card {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  box-shadow: var(--shadow-subtle);
}

.sidebar-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-list a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: block;
}

.toc-list a:hover {
  color: var(--brand-blue);
  padding-left: 4px;
}

.related-articles-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.related-articles-list a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: block;
}

.related-articles-list a:hover {
  color: var(--brand-blue);
}

/* 正文内容排版 */
.article-content {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 48px 44px;
  box-shadow: var(--shadow-subtle);
}

.article-lead {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  background: var(--bg-main);
  padding: 20px 24px;
  border-left: 4px solid var(--brand-blue);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 36px;
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 40px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
  letter-spacing: -0.01em;
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 28px 0 14px;
}

.article-content p {
  font-size: 1rem;
  line-height: 1.85;
  color: #334155;
  margin-bottom: 18px;
}

.article-content ul, .article-content ol {
  margin: 16px 0 24px 24px;
  color: #334155;
  font-size: 1rem;
  line-height: 1.8;
}

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

.article-callout {
  background: #F0FDF4;
  border: 1px solid #BBF7D0;
  border-radius: var(--radius-md);
  padding: 20px 22px;
  margin: 28px 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: #166534;
}

.article-callout.warning {
  background: #FEF3C7;
  border-color: #FDE68A;
  color: #92400E;
}

.article-callout.info {
  background: var(--brand-blue-light);
  border-color: #DDE8FF;
  color: #1E3A8A;
}

.article-table-wrapper {
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.925rem;
  text-align: left;
}

.article-table th {
  background: var(--bg-main);
  padding: 14px 18px;
  font-weight: 700;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-light);
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
}

.article-table tr:last-child td {
  border-bottom: none;
}

/* 文章底部导航与返回 */
.article-footer-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}

/* 文章底部【立即购买】行动召唤按钮 */
.article-cta-wrapper {
  margin: 36px 0 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

.article-buy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  max-width: 480px;
  padding: 15px 32px;
  background: linear-gradient(135deg, #315CF5 0%, #1E46DE 100%);
  color: #FFFFFF !important;
  font-size: 1.05rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: 10px;
  box-shadow: 0 4px 14px rgba(49, 92, 245, 0.28);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  letter-spacing: 0.02em;
}

.article-buy-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(49, 92, 245, 0.38);
  background: linear-gradient(135deg, #2850EB 0%, #183DC9 100%);
  color: #FFFFFF !important;
}

.article-buy-btn svg {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.article-buy-btn:hover svg.btn-arrow {
  transform: translateX(4px);
}

/* 响应式断点 */
@media (max-width: 1024px) {
  .article-layout-grid {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    position: static;
  }
  .article-content {
    padding: 32px 24px;
  }
}

@media (max-width: 768px) {
  .article-main-title {
    font-size: 1.75rem;
  }
  .article-content h2 {
    font-size: 1.35rem;
  }
}