/* ============================================================
 * blog-enhance.css
 * Styles cho TOC, lightbox, callouts trên trang bài viết yokool.vn
 *
 * Sử dụng: thêm <link rel="stylesheet" href="/blog-enhance.css">
 * vào head của trang article (function tự include)
 * ============================================================ */

/* ============================================================
   1. Reading Progress Bar
   - Đã inline trong JS, không cần CSS thêm
   ============================================================ */

/* ============================================================
   2. Table of Contents
   ============================================================ */
#article-toc {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  width: 260px;
  max-height: 70vh;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  z-index: 50;
  overflow: hidden;
  font-family: var(--font-sans, 'Be Vietnam Pro', sans-serif);
  display: flex;
  flex-direction: column;
}

#article-toc.is-collapsed .toc-list {
  display: none;
}
#article-toc.is-collapsed {
  width: auto;
  max-height: none;
}

.toc-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  border-bottom: 1px solid #f0f0f0;
  background: #fafbfc;
}

.toc-icon {
  font-size: 16px;
  color: #6b7280;
  font-weight: bold;
}

.toc-title {
  font-size: 13px;
  font-weight: 600;
  color: #1f2937;
  flex: 1;
  letter-spacing: -0.01em;
}

.toc-toggle {
  background: transparent;
  border: none;
  width: 22px;
  height: 22px;
  font-size: 18px;
  line-height: 1;
  color: #6b7280;
  cursor: pointer;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.toc-toggle:hover {
  background: #f3f4f6;
  color: #1f2937;
}

.toc-list {
  list-style: none;
  margin: 0;
  padding: 8px 0;
  overflow-y: auto;
  flex: 1;
}

.toc-item {
  position: relative;
}

.toc-item a {
  display: block;
  padding: 6px 14px 6px 18px;
  font-size: 13px;
  line-height: 1.4;
  color: #6b7280;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all 0.15s ease;
}

.toc-h2 a {
  padding-left: 18px;
  font-weight: 500;
}
.toc-h3 a {
  padding-left: 32px;
  font-size: 12px;
}

.toc-item a:hover {
  color: #DC143B;
  background: #fff8f9;
}

.toc-item a.is-active {
  color: #DC143B;
  border-left-color: #DC143B;
  background: #fff8f9;
  font-weight: 600;
}

/* TOC scrollbar nhỏ gọn */
.toc-list::-webkit-scrollbar {
  width: 4px;
}
.toc-list::-webkit-scrollbar-thumb {
  background: #d1d5db;
  border-radius: 4px;
}

/* Responsive - TOC ẩn dưới 1280px (vì không có chỗ) */
@media (max-width: 1280px) {
  #article-toc {
    position: relative;
    top: 0;
    right: 0;
    transform: none;
    width: 100%;
    max-width: 720px;
    margin: 0 auto 32px;
    max-height: none;
  }
}
@media (max-width: 640px) {
  #article-toc {
    margin: 0 16px 24px;
    width: auto;
  }
  .toc-list {
    max-height: 40vh;
  }
}

/* ============================================================
   3. Image Lightbox
   ============================================================ */
#lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  z-index: 9998;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  opacity: 0;
  transition: opacity 0.2s ease;
  cursor: zoom-out;
}
#lightbox-overlay.is-visible {
  opacity: 1;
}

.lightbox-image {
  max-width: 100%;
  max-height: calc(100vh - 120px);
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  cursor: default;
}

.lightbox-caption {
  color: rgba(255,255,255,0.9);
  font-size: 14px;
  margin-top: 16px;
  text-align: center;
  max-width: 720px;
  padding: 0 20px;
  cursor: default;
}

.lightbox-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  border: none;
  color: white;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
  backdrop-filter: blur(10px);
}
.lightbox-close:hover {
  background: rgba(255,255,255,0.2);
}

/* ============================================================
   4. Callout boxes - hiển thị bài viết CMS
   ============================================================ */
.article-body .callout {
  border-left: 4px solid;
  border-radius: 8px;
  padding: 16px 20px;
  margin: 1.5em 0;
  font-size: 15px;
  line-height: 1.65;
}
.article-body .callout > * { margin: 0.5em 0 !important; }
.article-body .callout > *:first-child { margin-top: 0 !important; }
.article-body .callout > *:last-child { margin-bottom: 0 !important; }
.article-body .callout p { color: inherit !important; }

.article-body .callout-info {
  background: #eff6ff;
  border-color: #3b82f6;
  color: #1e3a8a;
}
.article-body .callout-warning {
  background: #fffbeb;
  border-color: #f59e0b;
  color: #78350f;
}
.article-body .callout-success {
  background: #f0fdf4;
  border-color: #22c55e;
  color: #14532d;
}
.article-body .callout-tip {
  background: #faf5ff;
  border-color: #a855f7;
  color: #581c87;
}

/* ============================================================
   5. Image alignment from CMS editor
   ============================================================ */
.article-body figure[data-resizable-image] {
  margin: 1.5em 0;
}
.article-body figure[data-resizable-image][data-align="left"] {
  text-align: left;
}
.article-body figure[data-resizable-image][data-align="center"] {
  text-align: center;
}
.article-body figure[data-resizable-image][data-align="right"] {
  text-align: right;
}
.article-body figure[data-resizable-image] img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  display: inline-block;
}
.article-body figure[data-resizable-image] figcaption {
  font-size: 13px;
  color: #6b7280;
  font-style: italic;
  margin-top: 8px;
  text-align: inherit;
}

/* ============================================================
   6. YouTube embed responsive
   ============================================================ */
.article-body iframe.youtube-embed,
.article-body iframe[src*="youtube.com"],
.article-body iframe[src*="youtube-nocookie.com"] {
  display: block;
  margin: 1.5em auto;
  width: 100%;
  max-width: 720px;
  aspect-ratio: 16 / 9;
  height: auto;
  border-radius: 12px;
  border: none;
}

/* ============================================================
   7. Tables from CMS
   ============================================================ */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 14px;
  overflow-x: auto;
  display: block;
}
@media (min-width: 720px) {
  .article-body table { display: table; }
}
.article-body th, .article-body td {
  border: 1px solid #e5e7eb;
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
}
.article-body th {
  background: #f9fafb;
  font-weight: 600;
}

/* ============================================================
   8. Related posts grid
   ============================================================ */
.article-related-section {
  max-width: 1100px;
  margin: 64px auto 0;
  padding: 48px 24px 0;
  border-top: 1px solid #e5e7eb;
}

.article-related-section h2 {
  font-family: var(--font-display, 'Plus Jakarta Sans', sans-serif);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: -0.01em;
  margin: 0 0 28px;
  color: #111827;
}

.article-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.related-card {
  display: flex;
  flex-direction: column;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.related-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0,0,0,0.08);
  border-color: #111827;
}

.related-card-thumb {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #f3f4f6;
}
.related-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.related-card:hover .related-card-thumb img {
  transform: scale(1.04);
}

.related-card-body {
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.related-card-category {
  font-family: var(--font-mono, monospace);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #DC143B;
}

.related-card-title {
  font-family: var(--font-display, 'Plus Jakarta Sans', sans-serif);
  font-weight: 600;
  font-size: 15px;
  line-height: 1.4;
  color: #111827;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

@media (max-width: 1024px) {
  .article-related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 640px) {
  .article-related-grid {
    grid-template-columns: 1fr;
  }
}