/* =============================================
   AAU — ARTICLE DETAIL (cask-inspired)
   ============================================= */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@500;600;700;800&family=Be+Vietnam+Pro:wght@400;500;600;700&display=swap');

:root {
  --art-primary: #1b2a4a;
  --art-primary-deep: #0f1b33;
  --art-accent: #c5a880;
  --art-accent-dark: #a68b3c;
  --art-accent-mist: #f5f0e8;
  --art-text: #1f2937;
  --art-text-muted: #6b7280;
  --art-border: #e5e7eb;
  --art-bg: #f9fafb;
  --art-white: #ffffff;
}

.aau-art {
  background: var(--art-bg);
  font-family: 'Be Vietnam Pro', 'Inter', sans-serif;
  color: var(--art-text);
}

/* === Hero === */
.aau-art__hero {
  position: relative;
  background-size: cover;
  background-position: center;
  background-color: var(--art-primary);
  padding: 100px 24px 80px;
  text-align: center;
  overflow: hidden;
}
.aau-art__hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15, 27, 51, 0.55) 0%, rgba(15, 27, 51, 0.8) 100%);
  z-index: 1;
}
.aau-art__hero-inner {
  position: relative;
  z-index: 2;
  max-width: 880px;
  margin: 0 auto;
}
.aau-art__breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.78);
  margin-bottom: 14px;
}
.aau-art__breadcrumb a {
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  transition: color .15s;
}
.aau-art__breadcrumb a:hover {
  color: var(--art-white);
}
.aau-art__breadcrumb span {
  opacity: 0.5;
}
.aau-art__category {
  display: inline-block;
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--art-accent);
  color: var(--art-accent);
  font-family: 'Montserrat', sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
}
.aau-art__title {
  font-family: 'Montserrat', sans-serif;
  font-size: 38px;
  font-weight: 800;
  color: var(--art-white);
  margin: 0 0 18px;
  line-height: 1.25;
  letter-spacing: -0.5px;
}
.aau-art__meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.78);
}
.aau-art__meta-sep {
  opacity: 0.5;
}

/* === 2-column layout === */
.aau-art__wrap {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}
.aau-art__layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  padding: 48px 0 56px;
}

/* === TOC sidebar === */
.aau-art__toc {
  position: relative;
}
.aau-art__toc-inner {
  position: sticky;
  top: 80px;
  background: var(--art-white);
  border: 1px solid var(--art-border);
  border-radius: 10px;
  padding: 18px 20px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}
.aau-art__toc-head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Montserrat', sans-serif;
  font-size: 13px;
  font-weight: 700;
  color: var(--art-primary);
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--art-border);
}
.aau-art__toc-section-label {
  font-family: 'Montserrat', sans-serif;
  font-size: 11px;
  font-weight: 700;
  color: var(--art-accent-dark);
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.aau-art__toc-nav {
  display: flex;
  flex-direction: column;
}
.aau-art__toc-link {
  padding: 7px 0 7px 12px;
  font-size: 13px;
  color: var(--art-text-muted);
  text-decoration: none;
  line-height: 1.45;
  border-left: 2px solid transparent;
  transition: all .15s;
}
.aau-art__toc-link:hover {
  color: var(--art-primary);
}
.aau-art__toc-link.is-active {
  color: var(--art-accent-dark);
  border-left-color: var(--art-accent);
  font-weight: 600;
}
.aau-art__toc-link--sub {
  padding-left: 22px;
  font-size: 12.5px;
}

/* === Content === */
.aau-art__content {
  font-size: 16px;
  line-height: 1.75;
  color: var(--art-text);
  max-width: 760px;
}
.aau-art__content > * + * {
  margin-top: 1.2em;
}
.aau-art__content h2 {
  font-family: 'Montserrat', sans-serif;
  font-size: 24px;
  font-weight: 700;
  color: var(--art-primary);
  margin-top: 2em;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--art-accent);
  scroll-margin-top: 80px;
}
.aau-art__content h3 {
  font-family: 'Montserrat', sans-serif;
  font-size: 19px;
  font-weight: 700;
  color: var(--art-primary);
  margin-top: 1.6em;
  scroll-margin-top: 80px;
}
.aau-art__content p {
  margin: 0;
}
.aau-art__content a {
  color: var(--art-accent-dark);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.aau-art__content a:hover {
  color: var(--art-accent);
}
.aau-art__content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1.5em 0;
}
.aau-art__content ul, .aau-art__content ol {
  padding-left: 24px;
}
.aau-art__content ul li, .aau-art__content ol li {
  margin-bottom: 0.4em;
}
.aau-art__content blockquote {
  border-left: 4px solid var(--art-accent);
  background: var(--art-accent-mist);
  padding: 16px 20px;
  margin: 1.5em 0;
  font-style: italic;
  color: var(--art-text);
  border-radius: 0 8px 8px 0;
}

/* === Related course === */
.aau-art__related-course {
  background: var(--art-white);
  padding: 48px 0;
  border-top: 1px solid var(--art-border);
}
.aau-art__related-course-wrap {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}
.aau-art__related-course-heading {
  font-family: 'Montserrat', sans-serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--art-primary);
  margin: 0 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--art-accent);
  display: inline-block;
}

/* Course card */
.aau-art__course-card {
  --cc: #1b2a4a;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 20px;
  background: var(--art-accent-mist);
  border: 1px solid color-mix(in srgb, var(--cc) 20%, var(--art-border));
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  transition: transform .25s, box-shadow .25s;
}
.aau-art__course-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}
.aau-art__course-img {
  width: 240px;
  height: 150px;
  border-radius: 8px;
  overflow: hidden;
  background: var(--art-white);
}
.aau-art__course-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.aau-art__course-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, color-mix(in srgb, var(--cc) 20%, white), color-mix(in srgb, var(--cc) 10%, white));
}
.aau-art__course-placeholder span {
  font-family: 'Montserrat', sans-serif;
  font-size: 48px;
  font-weight: 800;
  color: var(--cc);
  opacity: 0.55;
}
.aau-art__course-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.aau-art__course-title {
  font-family: 'Montserrat', sans-serif;
  font-size: 17px;
  font-weight: 700;
  color: var(--art-primary);
  margin: 0 0 6px;
  line-height: 1.35;
}
.aau-art__course-title a {
  color: inherit;
  text-decoration: none;
}
.aau-art__course-title a:hover {
  color: var(--cc);
}
.aau-art__course-desc {
  font-size: 13.5px;
  color: var(--art-text-muted);
  line-height: 1.55;
  margin: 0 0 10px;
}
.aau-art__course-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.aau-art__course-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12.5px;
  color: var(--art-text-muted);
  font-weight: 500;
}
.aau-art__course-format {
  padding: 2px 10px;
  background: rgba(0, 0, 0, 0.06);
  border-radius: 12px;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--art-text-muted);
}
.aau-art__course-cta {
  font-family: 'Montserrat', sans-serif;
  font-size: 13px;
  font-weight: 700;
  color: var(--cc);
  text-decoration: none;
  align-self: flex-start;
}
.aau-art__view-all-courses {
  display: inline-block;
  margin-top: 12px;
  font-family: 'Montserrat', sans-serif;
  font-size: 13px;
  font-weight: 600;
  color: var(--art-primary);
  text-decoration: none;
}
.aau-art__view-all-courses:hover {
  color: var(--art-accent-dark);
}

/* === Responsive === */
@media (max-width: 1024px) {
  .aau-art__layout {
    grid-template-columns: 220px 1fr;
    gap: 32px;
  }
  .aau-art__title { font-size: 30px; }
  .aau-art__hero { padding: 80px 24px 64px; }
}

@media (max-width: 768px) {
  .aau-art__layout {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 0 40px;
  }
  .aau-art__toc {
    order: -1;
  }
  .aau-art__toc-inner {
    position: static;
    max-height: none;
  }
  .aau-art__title { font-size: 24px; }
  .aau-art__hero { padding: 60px 16px 48px; }
  .aau-art__wrap { padding: 0 16px; }
  .aau-art__content { font-size: 15px; }
  .aau-art__content h2 { font-size: 21px; }
  .aau-art__content h3 { font-size: 17px; }

  .aau-art__course-card {
    grid-template-columns: 1fr;
    padding: 16px;
  }
  .aau-art__course-img {
    width: 100%;
    height: 180px;
  }
  .aau-art__related-course-wrap {
    padding: 0 16px;
  }
}