/* ── Article page styles ── */

/* Progress bar */
.read-progress-bar {
  position: fixed; top: 0; left: 0; width: 100%; height: 3px;
  background: var(--color-border); z-index: 200;
}
.read-progress {
  height: 100%; width: 0%; background: var(--color-accent);
  transition: width 0.1s linear;
}

/* Article header */
.article-header {
  padding: clamp(2rem, 5vw, 3.5rem) var(--page-px) clamp(1.5rem, 4vw, 2rem);
  border-bottom: 0.5px solid var(--color-border);
  max-width: var(--max-w); margin: 0 auto; width: 100%;
}
.article-breadcrumb {
  display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap;
  font-size: 0.8125rem; color: var(--color-hint); margin-bottom: 1rem;
}
.article-breadcrumb a { color: var(--color-muted); transition: color 0.15s; }
.article-breadcrumb a:hover { color: var(--color-accent); }
.article-breadcrumb i { font-size: 0.75rem; }
.article-header .tag { margin-bottom: 0.85rem; }
.article-header h1 {
  font-size: clamp(1.625rem, 4vw, 2.25rem);
  font-weight: 700; letter-spacing: -0.4px; line-height: 1.2;
  margin-bottom: 1.25rem; max-width: 780px;
}
.article-meta {
  display: flex; align-items: center; gap: 1.25rem; flex-wrap: wrap;
  font-size: 0.8125rem; color: var(--color-hint);
}
.article-meta span {
  display: flex; align-items: center; gap: 5px;
}
.article-meta i { font-size: 0.875rem; }

/* Article layout: body + sidebar */
.article-wrap {
  display: grid; grid-template-columns: 1fr 260px;
  gap: 3rem; align-items: start;
  max-width: var(--max-w); margin: 0 auto; width: 100%;
  padding: clamp(2rem, 5vw, 3rem) var(--page-px);
}

/* Article body */
.article-body { min-width: 0; }
.article-intro {
  font-size: clamp(1rem, 2.5vw, 1.125rem);
  color: var(--color-text); line-height: 1.85;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 0.5px solid var(--color-border);
  font-weight: 400;
}
.article-body h2 {
  font-size: clamp(1.0625rem, 2.5vw, 1.25rem);
  font-weight: 700; margin: 2rem 0 0.75rem;
  letter-spacing: -0.2px; line-height: 1.3;
}
.article-body p {
  font-size: clamp(0.9375rem, 2vw, 1rem);
  color: var(--color-muted); line-height: 1.85;
  margin-bottom: 1rem;
}

/* Sidebar */
.article-sidebar {
  position: sticky; top: 80px;
  display: flex; flex-direction: column; gap: 1rem;
}
.sidebar-card {
  border: 0.5px solid var(--color-border);
  border-radius: var(--radius-lg); padding: 1.1rem 1.25rem;
  background: var(--color-bg-secondary);
}
.sidebar-card h4 {
  font-size: 0.75rem; letter-spacing: 1.3px;
  text-transform: uppercase; color: var(--color-hint);
  margin-bottom: 0.85rem; font-weight: 700;
}
.sidebar-back-btn {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.875rem; color: var(--color-accent);
  font-weight: 500; transition: gap 0.15s;
}
.sidebar-back-btn:hover { gap: 10px; }
.share-icons {
  display: flex; gap: 0.5rem;
}

/* Responsive */
@media (max-width: 900px) {
  .article-wrap { grid-template-columns: 1fr; gap: 2rem; }
  .article-sidebar { position: static; flex-direction: row; flex-wrap: wrap; }
  .sidebar-card { flex: 1 1 200px; }
}
@media (max-width: 600px) {
  .article-header h1 { font-size: 1.5rem; }
  .article-meta { gap: 0.75rem; }
  .article-sidebar { flex-direction: column; }
}