/* =====================================================================
   SERPUPDATE: Blog (listing + single post)
   Light-mode only. Tokens: assets/serpupdate-tokens.css
   Mục tiêu chính: nội dung dán từ HTML KHÔNG được phép làm tràn trang.
   ===================================================================== */

/* ---------------------------------------------------------------------
   1. Khóa tràn ngang: nguyên nhân gốc làm vỡ header khi bài có bảng/mã
   Grid item mặc định min-width:auto nên nội dung rộng kéo giãn cả cột.
   minmax(0,1fr) + min-width:0 chặn hành vi đó.
   --------------------------------------------------------------------- */
.lv2-single-content .lv2-container {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 48px;
  align-items: start;
}
.lv2-article-body,
.lv2-sidebar { min-width: 0; }

.lv2-single-content { padding: 40px 0 80px; }

/* ---------------------------------------------------------------------
   2. Typography thân bài
   --------------------------------------------------------------------- */
.lv2-article-body {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-primary);
  overflow-wrap: break-word;
  word-break: break-word;
}
.lv2-article-body h2 {
  font-size: clamp(23px, 2.2vw, 28px);
  margin: 48px 0 20px;
  color: var(--heading-color, var(--text-primary));
  scroll-margin-top: 100px;
}
.lv2-article-body h3 {
  font-size: clamp(19px, 1.7vw, 22px);
  margin: 32px 0 16px;
  color: var(--heading-color, var(--text-primary));
  scroll-margin-top: 100px;
}
.lv2-article-body h4 { font-size: 18px; margin: 28px 0 12px; scroll-margin-top: 100px; }
.lv2-article-body p { margin-bottom: 24px; }
.lv2-article-body ul,
.lv2-article-body ol { margin-bottom: 24px; padding-left: 24px; }
.lv2-article-body li { margin-bottom: 8px; }
.lv2-article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
.lv2-article-body a:hover { color: var(--primary-hover); }

.lv2-article-body blockquote {
  margin: 32px 0;
  padding: 24px 32px;
  border-left: 0 !important;
  background: var(--primary-tint);
  border-radius: var(--radius-lg);
  font-style: italic;
  font-size: 18px;
  color: var(--primary);
}
.lv2-article-body blockquote p:last-child { margin-bottom: 0; }

/* ---------------------------------------------------------------------
   3. Media: không bao giờ rộng hơn khung
   --------------------------------------------------------------------- */
.lv2-article-body img,
.lv2-article-body svg,
.lv2-article-body video,
.lv2-article-body canvas {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 24px 0;
}
.lv2-article-body figure { margin: 24px 0; max-width: 100%; }
.lv2-article-body figure img { margin: 0; }
.lv2-article-body figcaption {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 8px;
  text-align: center;
}

/* Video / iframe nhúng: giữ tỷ lệ, không gây layout shift */
.lv2-embed {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin: 24px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--surface-3);
}
.lv2-embed > iframe,
.lv2-embed > video,
.lv2-embed > object,
.lv2-embed > embed {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  margin: 0;
}
/* iframe lọt lưới (không được bọc) vẫn phải bị chặn */
.lv2-article-body iframe { max-width: 100%; }

/* ---------------------------------------------------------------------
   4. Bảng: cuộn ngang BÊN TRONG khung, trang đứng yên
   --------------------------------------------------------------------- */
.lv2-table-scroll {
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 24px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--card-bg);
}
.lv2-article-body .lv2-table-scroll table {
  margin: 0;
  border: 0;
  min-width: 560px;
}
.lv2-article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
.lv2-article-body th,
.lv2-article-body td {
  padding: 12px 16px;
  border: 0;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}
/* Bảng dán tay hay kèm border="1", ghi đè để về đúng kiểu của site. */
.lv2-article-body table[border] { border: 0; }
.lv2-article-body table[border] th,
.lv2-article-body table[border] td { border: 0; border-bottom: 1px solid var(--border); }
.lv2-article-body thead th {
  background: var(--table-head-bg);
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}
.lv2-article-body tbody tr:last-child td { border-bottom: 0; }
.lv2-article-body tbody tr:hover { background: var(--table-hover); }

/* ---------------------------------------------------------------------
   5. Khối mã: cuộn ngang trong khung mã
   --------------------------------------------------------------------- */
.lv2-article-body pre {
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 20px;
  margin: 24px 0;
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  white-space: pre;
  word-break: normal;
  overflow-wrap: normal;
}
.lv2-article-body pre code {
  background: none;
  padding: 0;
  border: 0;
  font-size: inherit;
  white-space: pre;
}
.lv2-article-body :not(pre) > code {
  font-family: var(--font-mono);
  font-size: .9em;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: var(--surface-3);
  border: 1px solid var(--border);
  overflow-wrap: break-word;
}

/* ---------------------------------------------------------------------
   6. Mục lục (TOC): light: phẳng + shadow mềm, KHÔNG glass/blur
   --------------------------------------------------------------------- */
.lv2-sidebar { position: sticky; top: 100px; }
.lv2-toc {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}
.lv2-toc-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
}
.lv2-toc-list { list-style: none; padding: 0; margin: 0; }
.lv2-toc-list li { margin-bottom: 10px; line-height: 1.4; }
.lv2-toc-list a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  display: block;
  transition: color var(--transition-fast), transform var(--transition-fast);
  overflow-wrap: break-word;
}
.lv2-toc-list a:hover { color: var(--primary); transform: translateX(4px); }
.lv2-toc-item-h3 a { padding-left: 16px; font-size: 13px; color: var(--text-muted); }

/* ---------------------------------------------------------------------
   7. Điều hướng: quay lại blog + bài liên quan
   --------------------------------------------------------------------- */
.lv2-post-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 8px 14px;
  min-height: 44px;
  box-sizing: border-box;
  border: 1px solid var(--border);
  border-radius: 99px;
  background: var(--card-bg);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.lv2-post-back:hover { color: var(--primary); border-color: var(--primary); }

.lv2-related { padding: 0 0 80px; }
.lv2-related__title {
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 700;
  margin-bottom: 28px;
  color: var(--text-primary);
}
.lv2-related__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 24px;
}

/* ---------------------------------------------------------------------
   8. Thẻ bài viết (listing + related)
   --------------------------------------------------------------------- */
.lv2-post-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}
.lv2-post-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.lv2-post-card__media {
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--surface-3);
}
.lv2-post-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-normal);
}
.lv2-post-card:hover .lv2-post-card__media img { transform: scale(1.04); }

/* Ảnh đại diện trống: nền thương hiệu thay vì ô rỗng */
.lv2-post-card__media--empty {
  position: relative;
  background: linear-gradient(135deg, var(--primary-tint) 0%, var(--surface-3) 100%);
}
.lv2-post-card__media--empty::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("images/blog-placeholder.svg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 96px auto;
  opacity: .5;
}

.lv2-post-card__body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  min-width: 0;
}
.lv2-post-card__meta {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
.lv2-post-card__cat {
  background: var(--primary-tint);
  color: var(--primary-dark);
  padding: 2px 8px;
  border-radius: 99px;
  font-weight: 500;
}
.lv2-post-card__title {
  margin: 0 0 12px;
  font-size: 18px;
  line-height: 1.4;
  overflow-wrap: break-word;
}
.lv2-post-card__title a { color: var(--text-primary); text-decoration: none; }
.lv2-post-card__title a:hover { color: var(--primary); }
.lv2-post-card__desc {
  margin-bottom: 24px;
  flex-grow: 1;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.65;
}
.lv2-post-card__more {
  color: var(--primary);
  font-weight: 600;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
}
.lv2-post-card__more:hover { gap: 8px; }

/* ---------------------------------------------------------------------
   9. Tabs chuyên mục: touch target >= 44px
   --------------------------------------------------------------------- */
.lv2-blog-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.lv2-blog-tabs .lv2-tab { min-height: 44px; display: inline-flex; align-items: center; }

/* ---------------------------------------------------------------------
   10. Responsive
   --------------------------------------------------------------------- */
@media (max-width: 900px) {
  .lv2-single-content .lv2-container {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }
  .lv2-sidebar { position: static; max-height: none; }
  .lv2-toc { max-height: none; }
  .lv2-single-content { padding: 32px 0 56px; }
}
@media (max-width: 549px) {
  .lv2-article-body { font-size: 16px; }
  .lv2-article-body blockquote { padding: 20px; font-size: 16px; }
  .lv2-article-body pre { padding: 16px; font-size: 13px; }
  .lv2-post-card__body { padding: 20px; }
  .lv2-related { padding-bottom: 56px; }
}