/* ==========================================================================
   YOU-TU (you-tu.cfd) - 文章专栏与知识库专属原生样式表
   零外部依赖 · 专注 SEO 权重传递与丝滑阅读体验
   ========================================================================== */

.article-page {
  padding-top: 40px;
  padding-bottom: 90px;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.breadcrumb-nav a {
  color: var(--text-muted);
}

.breadcrumb-nav a:hover {
  color: var(--primary-light);
}

.breadcrumb-separator {
  color: var(--text-dim);
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 48px;
  align-items: start;
}

/* 主文章容器 */
.article-main {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 44px 40px;
}

.article-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 28px;
  margin-bottom: 32px;
}

.article-post-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255, 0, 85, 0.12);
  color: #ff3377;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.article-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.5px;
  margin-bottom: 18px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--text-dim);
  font-size: 0.88rem;
  flex-wrap: wrap;
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 核心导读/TL;DR 摘要框 */
.article-summary-box {
  background: linear-gradient(135deg, rgba(255, 0, 85, 0.08) 0%, rgba(0, 229, 255, 0.05) 100%);
  border: 1px solid rgba(255, 0, 85, 0.25);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 36px;
}

.summary-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 800;
  color: #ff3377;
  margin-bottom: 10px;
}

.summary-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 文章正文排版规范 */
.article-body {
  color: #cbd5e1;
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-white);
  margin-top: 42px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h2::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 22px;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #f1f5f9;
  margin-top: 30px;
  margin-bottom: 14px;
}

.article-body p {
  margin-bottom: 20px;
}

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

.article-body ul li {
  list-style-type: disc;
  margin-bottom: 10px;
}

.article-body ol li {
  list-style-type: decimal;
  margin-bottom: 10px;
}

.article-body strong {
  color: var(--text-white);
  font-weight: 700;
}

.article-body a {
  color: #00e5ff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:hover {
  color: #ff3377;
}

.article-body blockquote {
  border-left: 4px solid #ff0055;
  background: rgba(255, 0, 85, 0.05);
  padding: 18px 22px;
  margin: 26px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text-muted);
}

/* 文章内嵌入式 CTA 促销横幅 */
.article-inline-cta {
  background: linear-gradient(135deg, rgba(255, 0, 85, 0.15) 0%, rgba(13, 19, 34, 0.95) 70%);
  border: 1.5px solid rgba(255, 0, 85, 0.4);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 38px 0;
  text-align: center;
  box-shadow: 0 8px 30px rgba(255, 0, 85, 0.2);
}

.inline-cta-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-white);
}

.inline-cta-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* 侧边栏 */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: 96px;
}

.sidebar-widget {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.sidebar-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-item a {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.45;
  display: block;
  padding: 4px 0;
}

.toc-item a:hover {
  color: #ff3377;
  padding-left: 6px;
}

.sidebar-promo-card {
  background: linear-gradient(180deg, rgba(255, 0, 85, 0.15) 0%, rgba(19, 28, 49, 0.9) 80%);
  border: 1.5px solid rgba(255, 0, 85, 0.35);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
}

.promo-badge {
  display: inline-block;
  padding: 3px 10px;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.promo-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.promo-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 18px;
  line-height: 1.5;
}

/* 底部相关文章卡片 */
.related-articles-section {
  margin-top: 50px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}

.related-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 22px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* 响应式调整 */
@media (max-width: 992px) {
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    position: static;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .article-main {
    padding: 24px 18px;
  }
  .article-title {
    font-size: 1.65rem;
  }
  .article-body {
    font-size: 1rem;
  }
}