/* ==========================================================================
   网际快车内容站 - 文章页样式（评测 / 教程 / 知识库 / 对比）
   ========================================================================== */

.article-header {
  padding: 40px 0 8px;
}

.article-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.article-header h1 {
  margin-bottom: 16px;
}

.article-excerpt {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: var(--content-width);
  margin-bottom: 20px;
}

.article-info {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 13.5px;
  color: var(--text-muted);
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 32px;
}

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

.article-info svg {
  width: 16px;
  height: 16px;
}

/* ---------- Layout: content + TOC sidebar ---------- */
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 48px;
  align-items: start;
  padding-bottom: 64px;
}

.article-main {
  min-width: 0;
  max-width: var(--content-width);
}

.article-aside {
  position: sticky;
  top: calc(var(--header-height) + 20px);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.toc-box {
  background: var(--card-background);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
}

.toc-box .block-label {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.toc-list {
  display: grid;
  gap: 4px;
  max-height: 50vh;
  overflow-y: auto;
}

.toc-list a {
  display: block;
  padding: 7px 10px;
  border-left: 2px solid transparent;
  font-size: 13.5px;
  color: var(--text-secondary);
  border-radius: 0 6px 6px 0;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.toc-list a.toc-h3 {
  padding-left: 22px;
  font-size: 13px;
  color: var(--text-muted);
}

.toc-list a:hover {
  color: var(--brand-primary);
  background: var(--brand-primary-bg);
}

.toc-list a.is-active {
  color: var(--brand-primary);
  border-left-color: var(--brand-primary);
  background: var(--brand-primary-bg);
  font-weight: 600;
}

.aside-box {
  background: var(--card-background);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
}

.aside-box .block-label {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.aside-box ul {
  display: grid;
  gap: 10px;
}

.aside-box a {
  font-size: 13.5px;
  color: var(--text-secondary);
  font-weight: 600;
  display: block;
}

.aside-box a:hover {
  color: var(--brand-primary);
}

.aside-cta {
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-primary-dark));
  border-radius: var(--radius-lg);
  padding: 22px;
  color: #fff;
}

.aside-cta .block-label {
  color: #fff;
  font-size: 15px;
  margin-bottom: 8px;
}

.aside-cta p {
  color: #dbeafe;
  font-size: 13px;
  margin-bottom: 14px;
}

.copy-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--page-background);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  width: 100%;
  justify-content: center;
}

.copy-link-btn svg {
  width: 15px;
  height: 15px;
}

.copy-link-btn.is-copied {
  color: var(--success-color);
  border-color: #bbf7d0;
  background: var(--success-bg);
}

/* ---------- Prose ---------- */
.prose {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.85;
}

.prose > * + * {
  margin-top: 20px;
}

.prose h2 {
  margin-top: 44px;
  padding-top: 6px;
  scroll-margin-top: calc(var(--header-height) + 16px);
}

.prose h3 {
  margin-top: 28px;
  scroll-margin-top: calc(var(--header-height) + 16px);
}

.prose p {
  color: var(--text-secondary);
}

.prose ul,
.prose ol {
  display: grid;
  gap: 10px;
  padding-left: 4px;
}

.prose ul li,
.prose ol li {
  padding-left: 22px;
  position: relative;
  color: var(--text-secondary);
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand-primary);
}

.prose ol {
  counter-reset: item;
}

.prose ol li {
  counter-increment: item;
}

.prose ol li::before {
  content: counter(item);
  position: absolute;
  left: 0;
  top: 0;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--brand-primary-bg);
  color: var(--brand-primary);
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.prose strong {
  color: var(--text-primary);
}

.prose .table-wrap {
  margin: 8px 0;
}

.prose blockquote {
  margin: 0;
  padding: 16px 20px;
  border-left: 3px solid var(--brand-primary);
  background: var(--brand-primary-bg);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-primary);
  font-size: 14.5px;
}

.key-takeaway {
  background: var(--success-bg);
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-lg);
  padding: 24px 26px;
}

.key-takeaway h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--success-color);
  margin-bottom: 10px;
}

.key-takeaway svg {
  width: 20px;
  height: 20px;
}

/* ---------- Related / pagination ---------- */
.related-reading {
  margin-top: 48px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.related-card {
  background: var(--card-background);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.related-card:hover {
  border-color: var(--brand-primary);
  transform: translateY(-2px);
}

.related-card .badge {
  margin-bottom: 10px;
}

.related-card .block-label {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.5;
}

.article-pagination {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 40px;
}

.pagination-link {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  background: var(--card-background);
}

.pagination-link .direction {
  font-size: 12px;
  color: var(--text-muted);
  display: block;
  margin-bottom: 6px;
}

.pagination-link .title {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text-primary);
}

.pagination-link:hover .title {
  color: var(--brand-primary);
}

.pagination-link.next {
  text-align: right;
}

/* ---------- Mobile TOC toggle ---------- */
.toc-mobile-toggle {
  display: none;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  background: var(--card-background);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 13px 16px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.toc-mobile-toggle svg {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-fast);
}

.toc-mobile-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

/* ---------- List/archive pages (tutorials, knowledge index) ---------- */
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.filter-pill {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  background: var(--card-background);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-secondary);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-aside {
    position: static;
    order: -1;
  }

  .toc-box {
    display: none;
  }

  .toc-mobile-toggle {
    display: flex;
  }

  .toc-box.is-open {
    display: block;
  }

  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .related-grid {
    grid-template-columns: 1fr;
  }

  .article-pagination {
    grid-template-columns: 1fr;
  }

  .pagination-link.next {
    text-align: left;
  }

  .article-info {
    gap: 10px 16px;
  }
}