/* ==========================================================================
   Tanz Cloud 飞毯加速 - Article, Hub & Support Page Styles (Pure CSS)
   ========================================================================== */

.article-shell {
  padding: 44px 0 80px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: var(--cyan);
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 32px;
  align-items: start;
}

.article-paper {
  padding: 36px 38px;
  border-radius: var(--radius-lg);
  background: var(--bg-surface-strong);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
}

.article-kicker {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.article-h1 {
  margin: 0 0 16px;
  font-size: clamp(1.65rem, 3vw, 2.25rem);
  font-weight: 800;
  line-height: 1.3;
}

.article-byline {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.86rem;
  color: var(--text-muted);
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-content {
  font-size: 1.02rem;
  line-height: 1.88;
  color: var(--text-secondary);
}

.article-content h2 {
  margin: 30px 0 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  padding-left: 12px;
  border-left: 4px solid var(--cyan);
}

.article-content h3 {
  margin: 22px 0 10px;
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text-primary);
}

.article-content p {
  margin: 0 0 16px;
}

.article-content ul,
.article-content ol {
  margin: 0 0 18px;
  padding-left: 22px;
}

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

.article-content a {
  color: var(--cyan);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-content a:hover {
  color: var(--gold);
}

.article-content a.btn {
  text-decoration: none;
}

.article-callout {
  margin: 22px 0;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.28);
  color: var(--text-primary);
  font-size: 0.95rem;
}

.article-cta-box {
  margin: 28px 0;
  padding: 24px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(16, 33, 60, 0.92), rgba(10, 22, 42, 0.92));
  border: 1px solid var(--border-gold);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.article-cta-box h3 {
  margin: 0 0 4px;
  font-size: 1.15rem;
}

.article-cta-box p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.article-nav-row {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.article-nav-card {
  padding: 16px;
  border-radius: var(--radius-md);
  background: rgba(7, 12, 24, 0.72);
  border: 1px solid var(--border-subtle);
  display: block;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.article-nav-card:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.article-nav-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.article-nav-title {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Sidebar */
.article-sidebar {
  display: grid;
  gap: 20px;
  position: sticky;
  top: 94px;
}

.sidebar-box {
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-strong);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
}

.sidebar-box h3 {
  margin: 0 0 12px;
  font-size: 1.05rem;
  font-weight: 800;
}

.sidebar-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.sidebar-list a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: block;
  padding: 7px 10px;
  border-radius: 8px;
  background: rgba(7, 12, 24, 0.55);
  border: 1px solid rgba(148, 163, 184, 0.1);
  transition: border-color 0.18s ease, color 0.18s ease;
}

.sidebar-list a:hover {
  color: var(--cyan);
  border-color: var(--border-glow);
}

/* Hub & Sitemap Lists */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.sitemap-box {
  padding: 24px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-strong);
  border: 1px solid var(--border-subtle);
}

.sitemap-box h2 {
  margin: 0 0 14px;
  font-size: 1.15rem;
  color: var(--cyan);
}

.sitemap-box ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 9px;
}

.sitemap-box a {
  color: var(--text-secondary);
}

.sitemap-box a:hover {
  color: var(--cyan);
  text-decoration: underline;
}

@media (max-width: 980px) {
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    position: static;
  }
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .article-paper {
    padding: 24px 18px;
  }
  .article-nav-row,
  .hub-grid {
    grid-template-columns: 1fr;
  }
}