/* ========================================
   Article detail page
   Scoped to .page-article
   Layout reference: industry article two-column
   ======================================== */

.page-article .site-header,
.page-article .site-header.is-scrolled,
.page-article .site-header.is-menu-open,
.page-article .site-header:hover {
  background: var(--white);
  box-shadow: var(--shadow-header);
}

.page-article .main-nav a,
.page-article .site-header:hover .main-nav a,
.page-article .site-header.is-scrolled .main-nav a,
.page-article .site-header.is-menu-open .main-nav a {
  color: var(--text-muted) !important;
}

.page-article .main-nav a.active,
.page-article .main-nav a:hover,
.page-article .site-header:hover .main-nav a.active,
.page-article .site-header:hover .main-nav a:hover,
.page-article .site-header.is-scrolled .main-nav a.active,
.page-article .site-header.is-scrolled .main-nav a:hover {
  color: var(--primary) !important;
}

.page-article .lang-item,
.page-article .site-header:hover .lang-item,
.page-article .site-header.is-scrolled .lang-item,
.page-article .site-header.is-menu-open .lang-item {
  color: var(--text-muted);
}

.page-article .lang-item.is-active,
.page-article .lang-item:hover {
  color: var(--primary);
}

.page-article .lang-divider {
  background: var(--border-lang);
}

.page-article .icon-btn img,
.page-article .nav-chevron {
  filter: brightness(0) saturate(100%);
  opacity: 0.65;
}

.page-article .nav-toggle span {
  background: var(--text-muted);
  box-shadow: none;
}

.page-article .art-wrap {
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 80px);
  box-sizing: border-box;
}

.page-article .art-main {
  padding: calc(var(--header-h) + 28px) 0 96px;
  background: #f4f6f9;
}

.page-article .site-footer {
  margin-top: 0;
  padding-top: 48px;
  border-top: 1px solid var(--border-footer);
}

.page-article .art-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 28px;
  font-size: 13px;
  color: var(--text-light);
  list-style: none;
}

.page-article .art-breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}

.page-article .art-breadcrumb a:hover {
  color: var(--primary);
}

.page-article .art-breadcrumb__sep {
  color: #c5cad3;
}

.page-article .art-breadcrumb__current {
  color: var(--text-dark);
  max-width: 42ch;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.page-article .art-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  /* stretch so sidebar is as tall as the article; sticky TOC needs room to travel */
  align-items: stretch;
}

.page-article .art-content {
  background: var(--white);
  border-radius: 12px;
  padding: clamp(28px, 3.5vw, 48px);
  box-shadow: 0 4px 24px rgba(17, 40, 80, 0.04);
}

.page-article .art-sidebar {
  display: flex;
  flex-direction: column;
  gap: 18px;
  /* stickiness is on .art-toc; sidebar must be taller than the toc card */
  min-height: 0;
}

.page-article .art-title {
  margin: 0 0 18px;
  font-size: clamp(28px, 3.2vw, 40px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-dark);
  letter-spacing: 0.01em;
}

.page-article .art-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 0 0 22px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-news);
  font-size: 14px;
  color: var(--text-muted);
}

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

.page-article .art-meta__item svg {
  flex-shrink: 0;
  color: var(--primary);
  opacity: 0.85;
}

.page-article .art-share {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 28px;
}

.page-article .art-share__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 14px;
  border-radius: 8px;
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.page-article .art-share__btn:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.page-article .art-share__btn img {
  width: 18px;
  height: 18px;
  filter: brightness(0) invert(1);
}

.page-article .art-share__btn--linkedin {
  background: #0a66c2;
}

.page-article .art-share__btn--facebook {
  background: #1877f2;
}

.page-article .art-share__btn--x {
  background: #111111;
}

.page-article .art-cover {
  margin: 0 0 28px;
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-product-media);
}

.page-article .art-cover img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-article .art-body {
  font-size: 17px;
  line-height: 1.85;
  color: #333;
}

.page-article .art-body > p {
  margin: 0 0 1.15em;
}

.page-article .art-body > p:first-of-type {
  font-size: 18px;
  color: #2a2a2a;
}

.page-article .art-body h2 {
  position: relative;
  margin: 2em 0 0.85em;
  padding-left: 16px;
  font-size: clamp(22px, 2.2vw, 28px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-dark);
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-article .art-body h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 4px;
  border-radius: 2px;
  background: var(--primary);
}

.page-article .art-body h3 {
  margin: 1.6em 0 0.7em;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark);
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-article .art-body ul,
.page-article .art-body ol {
  margin: 0 0 1.2em;
  padding-left: 1.25em;
}

.page-article .art-body li {
  margin: 0.45em 0;
}

.page-article .art-body li strong {
  color: var(--text-dark);
}

.page-article .art-body table {
  width: 100%;
  margin: 0 0 1.4em;
  border-collapse: collapse;
  font-size: 15px;
  overflow: hidden;
  border-radius: 8px;
}

.page-article .art-body th,
.page-article .art-body td {
  padding: 12px 14px;
  border: 1px solid #e6ebf2;
  text-align: left;
  vertical-align: top;
}

.page-article .art-body th {
  background: #f3f7fc;
  font-weight: 600;
  color: var(--text-dark);
}

.page-article .art-body figure {
  margin: 1.4em 0;
}

.page-article .art-body figure img {
  display: block;
  width: 100%;
  border-radius: 10px;
}

.page-article .art-body figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-light);
  text-align: center;
}

.page-article .art-callout {
  margin: 1.5em 0;
  padding: 18px 20px;
  border-radius: 10px;
  background: linear-gradient(135deg, #f0f6ff 0%, #f7fbff 100%);
  border: 1px solid #d9e8fb;
}

.page-article .art-callout p {
  margin: 0;
  font-size: 16px;
  color: #335;
}

.page-article .art-faq {
  margin-top: 2.4em;
  padding-top: 1.6em;
  border-top: 1px solid var(--border-news);
}

.page-article .art-faq h2 {
  margin-top: 0;
}

.page-article .art-faq details {
  border-bottom: 1px solid #eef1f5;
}

.page-article .art-faq summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--text-dark);
}

.page-article .art-faq summary::-webkit-details-marker {
  display: none;
}

.page-article .art-faq summary::after {
  content: "+";
  float: right;
  color: var(--primary);
  font-weight: 400;
}

.page-article .art-faq details[open] summary::after {
  content: "–";
}

.page-article .art-faq details p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-article .art-related {
  margin-top: 2.2em;
  padding-top: 1.6em;
  border-top: 1px solid var(--border-news);
}

.page-article .art-related h2 {
  margin: 0 0 16px;
  padding-left: 16px;
  position: relative;
  font-size: 22px;
}

.page-article .art-related h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 4px;
  border-radius: 2px;
  background: var(--primary);
}

.page-article .art-related__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-article .art-related__list li {
  border-bottom: 1px solid #eef1f5;
}

.page-article .art-related__list a {
  display: block;
  padding: 14px 0;
  color: var(--text-dark);
  text-decoration: none;
  font-size: 16px;
  line-height: 1.5;
}

.page-article .art-related__list a:hover {
  color: var(--primary);
}

.page-article .art-side-card {
  background: var(--white);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 24px rgba(17, 40, 80, 0.05);
}

/* Sticky only works while a taller ancestor (stretched sidebar) stays in view */
.page-article .art-toc {
  position: sticky;
  top: calc(var(--header-h) + 12px);
  z-index: 2;
  align-self: stretch;
}
.page-article .art-rate__title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
}

.page-article .art-rate__stars {
  display: flex;
  gap: 2px;
  margin-bottom: 8px;
}

.page-article .art-rate__star {
  appearance: none;
  border: 0;
  padding: 2px 3px;
  margin: 0;
  background: transparent;
  color: #d5dae3;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  transition: color 0.15s ease, transform 0.15s ease;
}

.page-article .art-rate__star:hover,
.page-article .art-rate__star.is-hover,
.page-article .art-rate__star.is-active {
  color: #f5b400;
}

.page-article .art-rate__star:hover,
.page-article .art-rate__star:focus-visible {
  transform: scale(1.12);
  outline: none;
}

.page-article .art-rate__star:disabled {
  cursor: default;
  transform: none;
}

.page-article .art-rate__score {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.page-article .art-rate__thanks {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
}

.page-article .art-expert__head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.page-article .art-expert__avatar {
  position: relative;
  width: 64px;
  height: 64px;
  flex-shrink: 0;
}

.page-article .art-expert__avatar img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid #e8eef5;
}

.page-article .art-expert__online {
  position: absolute;
  right: 2px;
  bottom: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #22c55e;
  border: 2px solid #fff;
}

.page-article .art-expert__name {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
}

.page-article .art-expert__role {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.page-article .art-expert__live {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark);
}

.page-article .art-expert__desc {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-article .art-expert__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 46px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s ease;
}

.page-article .art-expert__cta:hover {
  background: var(--primary-hover);
}

.page-article .art-toc__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 12px;
  padding: 0;
  border: 0;
  background: none;
  width: 100%;
  cursor: pointer;
  font: inherit;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
  text-align: left;
}

.page-article .art-toc__chevron {
  width: 10px;
  height: 10px;
  border-right: 2px solid #8a93a3;
  border-bottom: 2px solid #8a93a3;
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.page-article .art-toc.is-collapsed .art-toc__chevron {
  transform: rotate(-135deg);
}

.page-article .art-toc.is-collapsed .art-toc__nav {
  display: none;
}

.page-article .art-toc__nav {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: art-toc;
}

.page-article .art-toc__nav > li {
  counter-increment: art-toc;
}

.page-article .art-toc__nav a {
  display: block;
  padding: 7px 0;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.45;
  border-bottom: 1px solid #f0f3f7;
}

.page-article .art-toc__nav a::before {
  content: counter(art-toc) ". ";
  color: var(--primary);
  font-weight: 600;
}

.page-article .art-toc__nav a:hover,
.page-article .art-toc__nav a.is-active {
  color: var(--primary);
}

.page-article .art-toc__sub {
  list-style: none;
  margin: 0;
  padding: 0 0 0 12px;
  counter-reset: art-toc-sub;
}

.page-article .art-toc__sub li {
  counter-increment: art-toc-sub;
}

.page-article .art-toc__sub a::before {
  content: counter(art-toc) "." counter(art-toc-sub) " ";
}

@media (max-width: 1080px) {
  .page-article .art-layout {
    grid-template-columns: 1fr;
  }

  .page-article .art-sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-article .art-toc {
    position: static;
  }

  .page-article .art-side-card--toc {
    grid-column: 1 / -1;
  }
}

@media (max-width: 720px) {
  .page-article .art-main {
    padding-top: calc(var(--header-h) + 16px);
    padding-bottom: 64px;
  }

  .page-article .site-footer {
    padding-top: 32px;
  }

  .page-article .art-content {
    padding: 22px 18px;
  }

  .page-article .art-share {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
  }

  .page-article .art-share__btn {
    min-height: 44px;
    padding: 0;
    gap: 0;
  }

  .page-article .art-share__btn span {
    display: none;
  }

  .page-article .art-share__btn img {
    width: 20px;
    height: 20px;
  }

  .page-article .art-sidebar {
    grid-template-columns: 1fr;
  }

  .page-article .art-body {
    font-size: 16px;
  }

  .page-article .art-body table {
    display: block;
    overflow-x: auto;
  }
}