/* ==========================================================================
   MyBacklinkIndex — Blog & Article Styles
   Only loaded on blog listing and blog post pages.
   ========================================================================== */

/* ---------- Blog listing ---------- */
.blog-featured { display: grid; gap: var(--sp-5); background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; margin-bottom: var(--sp-6); }
.blog-featured img { width: 100%; height: 220px; object-fit: cover; }
.blog-featured .content { padding: var(--sp-5); }
.blog-toolbar { display: flex; flex-direction: column; gap: var(--sp-3); margin-bottom: var(--sp-5); }
.chip-row { display: flex; gap: var(--sp-2); flex-wrap: wrap; }
.chip { border: 1px solid var(--border-strong); background: var(--surface); border-radius: var(--radius-full); padding: 6px 14px; font-size: var(--fs-sm); font-weight: 500; color: var(--text-muted); min-height: 40px; display: inline-flex; align-items: center; }
.chip.active, .chip[aria-pressed="true"] { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.post-grid { display: grid; grid-template-columns: 1fr; gap: var(--sp-5); }
.post-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; display: flex; flex-direction: column; }
.post-card img { width: 100%; height: 180px; object-fit: cover; }
.post-card .content { padding: var(--sp-4); display: flex; flex-direction: column; gap: var(--sp-2); flex: 1; }
.post-meta { font-size: var(--fs-xs); color: var(--text-muted); display: flex; gap: var(--sp-3); flex-wrap: wrap; }
.post-card h3 { font-size: var(--fs-lg); }
.cat-tag { align-self: flex-start; font-size: var(--fs-xs); font-weight: 600; color: var(--color-primary); background: var(--color-primary-light); padding: 3px 10px; border-radius: var(--radius-full); }

/* ---------- Blog post ---------- */
.article { max-width: var(--container-narrow); margin-inline: auto; padding-top: var(--sp-6); }
.article-hero { width: 100%; border-radius: var(--radius-lg); margin-bottom: var(--sp-5); }

/* Reading progress */
.reading-progress { position: fixed; top: 0; left: 0; width: 100%; height: 3px; z-index: 1001; pointer-events: none; background: transparent; }
.reading-progress div { height: 100%; width: 100%; background: linear-gradient(to right, var(--color-primary), var(--color-secondary)); transform-origin: left; }
@supports (animation-timeline: scroll(root)) {
  .reading-progress div { animation: read-progress linear; animation-timeline: scroll(root); width: 0; }
}
@keyframes read-progress { to { width: 100%; } }

/* Sticky TOC bar */
.article-toc-bar { position: sticky; top: var(--header-h); z-index: 10; background: var(--bg); border-bottom: 1px solid var(--border); padding-block: var(--sp-2); margin-bottom: var(--sp-5); }
.toc-details { font-size: var(--fs-sm); }
.toc-details summary { display: flex; align-items: center; gap: var(--sp-2); font-weight: 600; color: var(--text-muted); cursor: pointer; padding: var(--sp-2) 0; list-style: none; user-select: none; }
.toc-details summary::-webkit-details-marker { display: none; }
.toc-details summary::marker { display: none; content: ''; }
.toc-details summary::after { content: ''; display: inline-block; width: 0.45em; height: 0.45em; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(45deg) translateY(-1px); transition: transform var(--transition); margin-left: auto; }
.toc-details[open] summary::after { transform: rotate(-135deg); }
.toc-details nav ul { display: flex; flex-wrap: wrap; gap: var(--sp-2); list-style: none; padding: var(--sp-2) 0 var(--sp-3); margin: 0; }
.toc-details nav a { display: inline-block; padding: 5px 14px; border-radius: var(--radius-full); background: var(--surface); border: 1px solid var(--border); color: var(--text-muted); font-size: var(--fs-xs); font-weight: 500; white-space: nowrap; transition: all var(--transition); }
.toc-details nav a:hover, .toc-details nav a:focus-visible { background: var(--color-primary-light); color: var(--color-primary); border-color: var(--color-primary); text-decoration: none; }

.prose { font-size: var(--fs-lg); line-height: 1.8; max-width: 68ch; }
.prose h2 { margin-top: var(--sp-8); margin-bottom: var(--sp-3); scroll-margin-top: 120px; }
.prose h3 { margin-top: var(--sp-6); margin-bottom: var(--sp-2); }
.prose p, .prose ul, .prose ol { margin-bottom: var(--sp-5); }
.prose img { border-radius: var(--radius); margin-block: var(--sp-5); }
.callout { background: var(--color-info-bg); border-left: 4px solid var(--color-primary); border-radius: 0 var(--radius) var(--radius) 0; padding: var(--sp-4); margin-block: var(--sp-5); font-size: var(--fs-sm); }
.callout.warn { background: var(--color-warning-bg); border-left-color: var(--color-warning); }

/* ---------- Article supplementary ---------- */
.tag { align-self: flex-start; display: inline-block; font-size: var(--fs-xs); font-weight: 600; color: var(--color-primary); background: var(--color-primary-light); padding: 3px 10px; border-radius: var(--radius-full); margin-bottom: var(--sp-1); }

.feature-post { display: grid; grid-template-columns: 1fr; gap: 0; overflow: hidden; padding: 0; }
.feature-post:hover { text-decoration: none; border-color: var(--color-primary); }
.feature-post-media { overflow: hidden; }
.feature-post-media img { width: 100%; height: 240px; object-fit: cover; display: block; }
.feature-post-body { padding: var(--sp-5); display: flex; flex-direction: column; gap: var(--sp-2); }
.feature-post-body h2 { font-size: var(--fs-2xl); color: var(--heading); }
.feature-post-body p { color: var(--text-muted); }

.chips { display: flex; gap: var(--sp-2); flex-wrap: wrap; }
.blog-search { position: relative; display: flex; align-items: center; }
.blog-search svg { position: absolute; left: 12px; color: var(--text-muted); }
.blog-search input { padding-left: 40px; min-height: 44px; min-width: 240px; }

.post-card { padding: 0; overflow: hidden; }
.post-card-media { display: block; overflow: hidden; }
.post-card-media img { width: 100%; height: 180px; object-fit: cover; display: block; transition: transform var(--transition); }
.post-card-media:hover img { transform: scale(1.04); }
.post-card-body { padding: var(--sp-4); display: flex; flex-direction: column; gap: var(--sp-2); }
.post-card-body h3 { font-size: var(--fs-lg); }
.post-card-body h3 a { color: var(--heading); }
.post-card-body h3 a:hover { color: var(--color-primary); text-decoration: none; }
.post-card-body p { color: var(--text-muted); font-size: var(--fs-sm); }
.post-meta .avatar { width: 26px; height: 26px; }

.breadcrumb { display: flex; gap: var(--sp-2); font-size: var(--fs-sm); color: var(--text-muted); flex-wrap: wrap; margin-bottom: var(--sp-4); }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--color-primary); }
.article-head { margin-bottom: var(--sp-5); }
.article-head h1 { font-size: var(--fs-4xl); margin: var(--sp-3) 0; }
.article-head .lead { margin-bottom: var(--sp-4); font-size: var(--fs-xl); }
.article-hero img { width: 100%; border-radius: var(--radius-lg); display: block; }
.callout { display: flex; gap: var(--sp-3); align-items: flex-start; }
.callout .callout-ic { color: var(--color-primary); flex: none; }
.callout p { margin: 0; }
.prose blockquote { border-left: 4px solid var(--color-primary); background: var(--surface-alt); margin: var(--sp-5) 0; padding: var(--sp-5); border-radius: 0 var(--radius) var(--radius) 0; font-style: italic; color: var(--heading); font-size: var(--fs-base); }
.author-bio { display: flex; gap: var(--sp-4); align-items: flex-start; margin-top: var(--sp-8); }
.author-bio .avatar-lg { flex: none; width: 64px; height: 64px; overflow: hidden; }
.author-bio .avatar-lg img, img.avatar-lg { object-fit: cover; }
.author-bio h3 { font-size: var(--fs-lg); }
.author-bio p { color: var(--text-muted); font-size: var(--fs-sm); }

/* ---------- Responsive ---------- */
@media (min-width: 640px) {
  .post-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
  .blog-featured { grid-template-columns: 1fr 1fr; align-items: center; }
  .blog-featured img { height: 100%; }
  .blog-toolbar { flex-direction: row; align-items: center; justify-content: space-between; }
  .feature-post { grid-template-columns: 1fr 1fr; align-items: stretch; }
  .feature-post-media img { height: 100%; }
}

@media (min-width: 1024px) {
  .post-grid { grid-template-columns: repeat(3, 1fr); }
}