/* Tin STEM — bổ sung trên design system chung (style.css) */

.tin-stem-page .section {
  padding-top: 32px;
  padding-bottom: 48px;
}

.tin-stem-page .page-title {
  margin-bottom: 28px;
}

.tin-stem-page .page-title h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 900;
  color: var(--text);
  margin-bottom: 8px;
}

.tin-stem-page .page-title p {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 640px;
}

.tin-stem-page .level-breadcrumb {
  margin-bottom: 20px;
}

/* Breadcrumb 1 dòng — tiêu đề dài cắt ... */
.tin-breadcrumb {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  overflow: hidden;
  white-space: nowrap;
}

.tin-breadcrumb a,
.tin-breadcrumb__sep {
  flex-shrink: 0;
}

.tin-breadcrumb__current {
  flex: 1 1 0;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
  font-weight: 700;
}

.tin-container--article {
  max-width: 880px;
}

/* Khối nội dung */
.tin-block {
  margin-bottom: 36px;
}

.tin-block__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.tin-block__title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 14px;
}

.tin-block__head .tin-block__title {
  margin-bottom: 0;
}

/* Bộ lọc chuyên mục / hashtag */
.tin-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tin-filter {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  border: 2px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 700;
  transition: all var(--transition);
}

.tin-filter:hover {
  border-color: var(--primary-light);
  color: var(--primary);
}

.tin-filter.is-active {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.tin-filter--tag {
  font-size: 0.875rem;
  padding: 6px 14px;
}

/* Thẻ bài viết */
.tin-post-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 2px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition), transform var(--transition);
}

.tin-post-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.tin-post-card__media {
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.08), rgba(34, 197, 94, 0.08));
}

.tin-post-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.tin-post-card:hover .tin-post-card__media img {
  transform: scale(1.04);
}

.tin-post-card__placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  min-height: 140px;
  font-size: 2.25rem;
}

.tin-post-card__body {
  padding: 18px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.tin-post-card__title {
  font-size: 1.0625rem;
  font-weight: 800;
  line-height: 1.35;
  margin: 0;
}

.tin-post-card__title a {
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tin-post-card__title a:hover {
  color: var(--primary);
}

.tin-post-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.875rem;
}

.tin-post-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.tin-post-card__tags .badge {
  font-size: 0.75rem;
  padding: 4px 10px;
}

/* Nút xem thêm */
.tin-load-more {
  text-align: center;
  margin-top: 28px;
}

/* Trống */
.tin-empty {
  text-align: center;
  padding: 40px 24px;
}

.tin-empty__icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

/* Chi tiết bài viết */
.tin-article {
  padding: 28px 32px;
  margin-bottom: 32px;
}

.tin-article__header h1 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 900;
  color: var(--text);
  line-height: 1.3;
  margin-bottom: 12px;
}

.tin-article__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.9375rem;
  margin-bottom: 20px;
}

.tin-article__figure {
  margin: 0 0 24px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.tin-article__figure img {
  width: 100%;
  max-height: 440px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.tin-article__summary {
  font-size: 1.0625rem;
  line-height: 1.6;
  margin-bottom: 20px;
  padding-left: 16px;
  border-left: 4px solid var(--primary-light);
}

.tin-article__content {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text);
}

.tin-article__content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  margin: 16px 0;
}

.tin-article__content p {
  margin-bottom: 1em;
}

.tin-article__content h2,
.tin-article__content h3 {
  margin: 1.25em 0 0.5em;
  font-weight: 800;
  color: var(--text);
}

.tin-article__content ul,
.tin-article__content ol {
  list-style: disc;
  margin: 0 0 1em 1.5em;
}

.tin-article__content ol {
  list-style: decimal;
}

.tin-article__tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 2px solid var(--border);
}

.tin-back {
  margin-bottom: 8px;
}

@media (max-width: 768px) {
  .tin-stem-page .section {
    padding-top: 24px;
    padding-bottom: 36px;
  }

  .tin-article {
    padding: 20px 18px;
  }

  .tin-stem-page .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) and (max-width: 992px) {
  .tin-stem-page .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}