/* ==========================================================================
   Article detail page (.article-page)
   Main column (article) + sticky "Bài viết mới" sidebar, related grid below.
   Reuses .news-card / .news-date / .news-box__title from news-page.css.
   ========================================================================== */
.article-page {
  padding: var(--space-2) 0 var(--space-10);
}

.article-page__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 24px;
  align-items: start;
}

/* ---------- Article ---------- */
.article-detail {
  padding: 32px 40px 40px;
  border-radius: 15px;
  background: var(--color-bg-white);
  color: #353535;
}

.article-detail__cat {
  display: inline-block;
  margin-bottom: var(--space-3);
  padding: 0 14px;
  border-radius: 50px;
  background: #e6f0fa;
  color: var(--color-brand-blue);
  font-size: 14px;
  font-weight: 700;
  line-height: 30px;
  text-decoration: none;
}

.article-detail__cat:hover {
  background: var(--color-brand-blue);
  color: #ffffff;
}

.article-detail__title {
  margin: 0 0 var(--space-3);
  color: #1a202c;
  font-size: 30px;
  font-weight: 800;
  line-height: 1.3;
}

.article-detail__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  margin-bottom: var(--space-5);
  color: #718096;
  font-size: 14px;
}

.article-detail__meta > * + *::before {
  content: "•";
  margin-right: var(--space-4);
  color: #cbd5e0;
}

.article-detail__summary {
  margin: 0 0 var(--space-5);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.6;
}

.article-detail__cover {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: var(--space-6);
  border-radius: 12px;
}

/* ---------- Rich text ---------- */
.article-detail__content {
  font-size: 17px;
  line-height: 1.75;
}

.article-detail__content > * + * {
  margin-top: var(--space-4);
}

.article-detail__content h2 {
  margin-top: var(--space-8);
  color: #1a202c;
  font-size: 22px;
  font-weight: 800;
  line-height: 1.35;
}

.article-detail__content h3 {
  margin-top: var(--space-6);
  font-size: 19px;
  font-weight: 700;
}

.article-detail__content ul,
.article-detail__content ol {
  padding-left: 22px;
}

.article-detail__content ul {
  list-style: disc;
}

.article-detail__content ol {
  list-style: decimal;
}

.article-detail__content li + li {
  margin-top: var(--space-2);
}

.article-detail__content li::marker {
  color: var(--color-brand-blue);
}

.article-detail__content a {
  color: var(--color-brand-blue);
  text-decoration: underline;
}

.article-detail__content strong {
  color: #1a202c;
}

.article-detail__content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.5;
}

.article-detail__content th,
.article-detail__content td {
  padding: 10px 14px;
  border: 1px solid #e2e8f0;
  text-align: left;
  vertical-align: top;
}

.article-detail__content th {
  background: var(--color-brand-blue);
  color: #ffffff;
  font-weight: 700;
}

.article-detail__content tbody tr:nth-child(even) {
  background: #f7fafc;
}

.article-tip {
  padding: var(--space-4) var(--space-5);
  border-left: 4px solid #fdb813;
  border-radius: 8px;
  background: #fff8e6;
  font-size: 16px;
}

/* ---------- Table of contents ---------- */
.article-toc {
  padding: var(--space-4) var(--space-5);
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  background: #f7fafc;
}

.article-toc__title {
  margin: 0 0 var(--space-2);
  color: #1a202c;
  font-size: 17px;
  font-weight: 800;
}

.article-detail__content .article-toc__list {
  margin: 0;
  padding-left: 22px;
  list-style: decimal;
  font-size: 15px;
  line-height: 1.6;
}

.article-detail__content .article-toc__list li + li {
  margin-top: 4px;
}

.article-detail__content .article-toc__list a {
  color: #2d3748;
  text-decoration: none;
}

.article-detail__content .article-toc__list a:hover {
  color: var(--color-brand-blue);
  text-decoration: underline;
}

.article-detail__content h2[id] {
  scroll-margin-top: 90px;
}

/* ---------- Inline figure ---------- */
.article-figure {
  margin: var(--space-6) 0;
  text-align: center;
}

.article-figure img {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 0 auto;
  padding: var(--space-4);
  border: 1px solid #edf2f7;
  border-radius: 12px;
  background: #ffffff;
}

.article-figure figcaption {
  margin-top: var(--space-2);
  color: #718096;
  font-size: 14px;
  font-style: italic;
  line-height: 1.5;
}

/* ---------- CTA ---------- */
.article-detail__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-top: var(--space-8);
  padding: var(--space-5) var(--space-6);
  border-radius: 12px;
  background: linear-gradient(90deg, var(--color-brand-blue), #1da7b0);
  color: #ffffff;
  font-size: 16px;
  line-height: 1.5;
}

.article-detail__cta p {
  flex: 1 1 320px;
  margin: 0;
}

.article-detail__cta-btn {
  flex-shrink: 0;
  padding: 0 22px;
  border-radius: 50px;
  background: #fdb813;
  color: #142750;
  font-weight: 800;
  line-height: 44px;
  text-decoration: none;
  transition: filter var(--transition-fast);
}

.article-detail__cta-btn:hover {
  filter: brightness(1.05);
}

/* ---------- Sidebar ---------- */
.article-side {
  position: sticky;
  top: 90px;
}

.article-side__box {
  border-radius: 15px;
  background: var(--color-bg-white);
  overflow: hidden;
}

.article-side__heading {
  margin: 0;
  padding: 0 var(--space-4);
  background: #214186;
  color: #ffffff;
  font-size: 17px;
  font-weight: 800;
  line-height: 46px;
  text-transform: uppercase;
}

.article-side__list {
  list-style: none;
  margin: 0;
  padding: var(--space-2) var(--space-3) var(--space-3);
}

.article-side__item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-2);
  border-radius: 8px;
  color: #353535;
  text-decoration: none;
  transition: background var(--transition-fast);
}

.article-side__item:hover {
  background: #f0f7ff;
}

.article-side__item img {
  flex-shrink: 0;
  width: 104px;
  height: 66px;
  border-radius: 8px;
  object-fit: cover;
}

.article-side__title {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  margin-bottom: 4px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
}

.article-side__item:hover .article-side__title {
  color: var(--color-brand-blue);
}

.article-side__item time {
  color: #a0aec0;
  font-size: 12px;
}

/* ---------- Related ---------- */
.article-related {
  margin-top: 45px;
}

.article-related__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .article-page__layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .article-side {
    position: static;
  }

  .article-related__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  .article-detail {
    padding: 20px 16px 24px;
  }

  .article-detail__title {
    font-size: 23px;
  }

  .article-detail__summary {
    font-size: 16px;
  }

  .article-detail__content {
    font-size: 16px;
  }

  .article-detail__content h2 {
    font-size: 19px;
  }

  .article-detail__content table {
    display: block;
    overflow-x: auto;
  }

  .article-detail__cta {
    padding: var(--space-4);
  }

  .article-related__grid {
    gap: var(--space-2);
  }
}