/* ==========================================================================
   Blog article — modern single-page layout (RTL)
   ========================================================================== */

.article-progress {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 80;
  height: 3px;
  pointer-events: none;
  background: transparent;
}

.article-progress__bar {
  height: 100%;
  width: 0%;
  background: var(--gradient-primary);
  box-shadow: 0 0 12px var(--color-indigo-glow);
  transition: width 80ms linear;
}

.blog-article-page {
  position: relative;
  max-width: none;
  padding: 0;
  padding-block: var(--space-4) var(--space-6);
}

.blog-article-page__inner {
  width: min(100% - 2rem, 820px);
  margin-inline: auto;
}

.blog-article-page .breadcrumb {
  margin-bottom: var(--space-3);
}

/* ---- Header ---- */
.article-header {
  margin-bottom: var(--space-4);
  padding: var(--space-4);
  border-radius: calc(var(--radius-lg) + 4px);
  background:
    linear-gradient(145deg, rgba(99, 102, 241, 0.08), transparent 55%),
    linear-gradient(180deg, var(--color-white), color-mix(in srgb, var(--color-white) 88%, var(--color-bg)));
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-soft);
}

.article-header__cat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-primary);
  text-decoration: none;
  border-radius: var(--radius-full);
  background: var(--color-gray-soft);
  border: 1px solid var(--surface-border);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.article-header__cat:hover {
  opacity: 1;
  background: color-mix(in srgb, var(--color-primary) 16%, transparent);
  transform: translateY(-1px);
}

.article-header__title {
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 4.2vw, 2.55rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.025em;
  margin: 0 0 var(--space-3);
  color: var(--color-text);
  text-wrap: balance;
}

.article-header__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.article-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-bg) 70%, var(--color-white));
  color: var(--color-text-muted);
  font-size: 12.5px;
  font-weight: 500;
  text-decoration: none;
  line-height: 1.2;
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.article-chip--author {
  color: var(--color-text);
  font-weight: 600;
}

.article-chip--author:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.article-chip__icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  opacity: 0.85;
}

/* ---- Hero ---- */
.article-hero {
  margin: 0 0 var(--space-5);
  border-radius: calc(var(--radius-lg) + 6px);
  overflow: hidden;
  background: var(--color-gray-soft);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-card);
  aspect-ratio: 16 / 9;
}

.article-hero__img,
.article-hero picture,
.article-hero img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.article-hero__caption {
  margin: 0;
  padding: 10px 12px 12px;
  font-size: 13px;
  color: var(--color-text-muted);
  text-align: center;
  background: color-mix(in srgb, var(--color-white) 90%, transparent);
}

/* ---- TOC ---- */
.article-toc {
  margin-bottom: var(--space-5);
  padding: 0;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.article-toc__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  user-select: none;
}

.article-toc__summary::-webkit-details-marker {
  display: none;
}

.article-toc__title {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.article-toc__icon,
.article-toc__chevron {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.article-toc__chevron {
  color: var(--color-text-muted);
  transition: transform var(--transition-fast);
}

.article-toc[open] .article-toc__chevron {
  transform: rotate(180deg);
}

.article-toc__list {
  margin: 0;
  padding: 4px 8px 12px;
  list-style: none;
  border-top: 1px solid var(--color-border);
  counter-reset: toc;
}

.article-toc__item {
  padding: 0;
  font-size: 14px;
  line-height: 1.45;
  counter-increment: toc;
}

.article-toc__item a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.article-toc__item a::before {
  content: counter(toc, persian);
  flex-shrink: 0;
  min-width: 1.4em;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-primary);
  opacity: 0.75;
}

.article-toc__item a:hover {
  color: var(--color-text);
  background: var(--color-gray-soft);
}

/* ---- Body ---- */
.article-body {
  padding: 0;
  line-height: 1.9;
  font-size: clamp(1.02rem, 0.4vw + 0.95rem, 1.125rem);
  color: var(--color-text);
}

.article-body > p:first-of-type,
.article-body > p:first-of-type strong {
  color: var(--color-text);
}

.article-body > p:first-of-type {
  font-size: 1.08em;
  line-height: 1.85;
}

.article-body h2 {
  margin-top: clamp(2rem, 4vw, 2.75rem);
  margin-bottom: 0.85rem;
  padding-block-end: 0.55rem;
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-display);
  font-size: clamp(1.28rem, 2.5vw, 1.55rem);
  font-weight: 800;
  line-height: 1.35;
  color: var(--color-text);
  scroll-margin-top: 96px;
}

.article-body h3 {
  margin-top: 1.65rem;
  margin-bottom: 0.55rem;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--color-text);
  scroll-margin-top: 96px;
}

.article-body h4 {
  scroll-margin-top: 96px;
  font-family: var(--font-display);
  font-weight: 700;
}

.article-body p,
.article-body li {
  color: var(--color-text-muted);
  margin-bottom: 1.15em;
}

.article-body p:last-child,
.article-body li:last-child {
  margin-bottom: 0;
}

.article-body ul,
.article-body ol {
  padding-inline-start: 1.25em;
  margin-bottom: 1.25em;
}

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

.article-body ol {
  list-style: persian;
}

.article-body li::marker {
  color: var(--color-primary);
}

.article-body a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in srgb, var(--color-primary) 35%, transparent);
  transition: text-decoration-color var(--transition-fast), color var(--transition-fast);
}

.article-body a:hover {
  text-decoration-color: var(--color-primary);
}

.article-body em {
  display: block;
  margin-bottom: 1rem;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--surface-border);
  background: var(--color-gray-soft);
  font-style: normal;
  font-size: 0.95em;
  color: var(--color-text-muted);
}

.article-body strong {
  color: var(--color-text);
  font-weight: 700;
}

.article-body table {
  width: 100%;
  min-width: 480px;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.25rem 0;
  font-size: 14px;
  overflow: hidden;
  border-radius: var(--radius-md);
}

.article-body .table-wrap,
.article-body {
  overflow-wrap: anywhere;
}

/* horizontal scroll wrapper via CSS on overflow parent */
.article-body table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-white);
}

.article-body th,
.article-body td {
  border: none;
  border-bottom: 1px solid var(--color-border);
  padding: 12px 14px;
  text-align: right;
  white-space: nowrap;
}

.article-body tr:last-child td {
  border-bottom: none;
}

.article-body th {
  background: var(--color-gray-soft);
  font-weight: 700;
  color: var(--color-text);
  position: sticky;
  inset-block-start: 0;
}

.article-body blockquote {
  border-inline-start: 4px solid var(--color-primary);
  padding: 14px 16px;
  margin: 1.25rem 0;
  background: var(--color-gray-soft);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text);
}

.article-body figure {
  margin: 1.5rem 0;
}

.article-body figure img,
.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-soft);
}

.article-body .media {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--surface-border);
}

.article-body .media iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Content TOC heading is hidden via blog-article.js when duplicate */

/* ---- Tags / Author / Share ---- */
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.article-tags__item {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-white);
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.article-tags__item:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-gray-soft);
  transform: translateY(-1px);
}

.article-author {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  margin-top: var(--space-5);
  padding: var(--space-4);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(99, 102, 241, 0.06), transparent 60%),
    var(--color-white);
  box-shadow: var(--shadow-soft);
}

.article-author__avatar {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-gray-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  text-decoration: none;
  border: 2px solid var(--surface-border);
}

.article-author__avatar i {
  width: 24px;
  height: 24px;
}

.article-author__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-author__label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.article-author__name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.article-author__name:hover {
  color: var(--color-primary);
}

.article-author__role {
  display: block;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.article-author__bio {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.article-share {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-4);
  padding: 14px 16px;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  background: var(--color-white);
}

.article-share__label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.article-share__actions {
  display: flex;
  gap: 8px;
}

.article-share__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  text-decoration: none;
  background: var(--color-bg);
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.article-share__btn i {
  width: 18px;
  height: 18px;
}

.article-share__btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-gray-soft);
  transform: translateY(-2px);
}

/* ---- Prev / Next ---- */
.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.article-nav__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  background: var(--color-white);
  box-shadow: var(--shadow-soft);
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.article-nav__item:hover {
  border-color: var(--color-primary);
  background: var(--color-white);
  color: inherit;
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.article-nav__item--next {
  text-align: left;
}

.article-nav__item--empty {
  border: none;
  padding: 0;
  background: transparent;
  box-shadow: none;
}

.article-nav__label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.article-nav__label i {
  width: 16px;
  height: 16px;
}

.article-nav__title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--color-text);
}

/* ---- Related ---- */
.article-related {
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.article-related__heading {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2vw, 1.4rem);
  font-weight: 800;
  margin: 0 0 var(--space-4);
}

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

.blog-article-page .blog-post--compact {
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-white);
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.blog-article-page .blog-post--compact:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.blog-article-page .blog-post--compact .blog-post__link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.blog-article-page .blog-post--compact .blog-post__media {
  margin: 0;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-gray-soft);
}

.blog-article-page .blog-post--compact .blog-post__img,
.blog-article-page .blog-post--compact img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-article-page .blog-post--compact .blog-post__body {
  padding: 12px 14px 14px;
}

.blog-article-page .blog-post--compact .blog-post__title {
  font-size: 0.95rem;
  font-weight: 700;
  margin: 0 0 6px;
  line-height: 1.4;
}

.blog-article-page .blog-post--compact .blog-post__excerpt {
  font-size: 13px;
  margin: 0;
  color: var(--color-text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-article-page .blog-post__placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: var(--color-primary);
  opacity: 0.5;
}

.blog-article-page .blog-post__placeholder i {
  width: 28px;
  height: 28px;
}

/* ---- Responsive ---- */
@media (max-width: 991px) {
  .article-related__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .blog-article-page {
    padding-block: var(--space-3) calc(var(--space-6) + 64px);
  }

  .blog-article-page__inner {
    width: min(100% - 1.25rem, 820px);
  }

  .article-header {
    padding: var(--space-3);
    margin-bottom: var(--space-3);
    border-radius: var(--radius-lg);
  }

  .article-header__title {
    font-size: clamp(1.4rem, 6.5vw, 1.85rem);
  }

  .article-hero {
    width: calc(100% + 1.25rem);
    margin-inline: -0.625rem;
    margin-bottom: var(--space-4);
    border-radius: var(--radius-md);
    aspect-ratio: 16 / 10;
  }

  .article-body {
    font-size: 1.02rem;
    line-height: 1.85;
  }

  .article-body h2 {
    font-size: 1.2rem;
  }

  .article-nav {
    grid-template-columns: 1fr;
  }

  .article-nav__item--next {
    text-align: right;
  }

  .article-nav__item--empty {
    display: none;
  }

  .article-related__grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .article-share {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .article-share__actions {
    justify-content: flex-start;
  }

  .article-author {
    padding: var(--space-3);
  }

  .article-author__avatar {
    width: 52px;
    height: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .article-progress__bar,
  .article-chip,
  .article-nav__item,
  .blog-article-page .blog-post--compact,
  .article-share__btn,
  .article-tags__item {
    transition: none;
  }
}