/* ============================================
   Learn / Blog Pages — Linear-inspired
   ============================================ */

/* Hero */
.learn-hero {
  text-align: center;
  padding: 60px 24px 20px;
  max-width: 720px;
  margin: 0 auto;
}
.learn-hero h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--dsc-text);
  margin-bottom: 6px;
}
.learn-hero p {
  color: var(--dsc-text-muted);
  font-size: 16px;
}

/* Category Tabs */
.learn-categories {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  padding: 20px 24px 32px;
  max-width: 900px;
  margin: 0 auto;
}
.learn-categories a {
  padding: 7px 16px;
  border-radius: 20px;
  border: 1px solid var(--dsc-border);
  background: transparent;
  color: var(--dsc-text-muted);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  font-family: var(--dsc-font);
  transition: all 0.15s;
  white-space: nowrap;
}
.learn-categories a:hover {
  border-color: var(--dsc-primary);
  color: var(--dsc-primary);
}
.learn-categories a.active {
  background: var(--dsc-primary);
  border-color: var(--dsc-primary);
  color: #fff;
}

/* Featured Article */
.learn-featured {
  max-width: 1100px;
  margin: 0 auto 32px;
  padding: 0 24px;
}
.learn-featured a {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  background: var(--dsc-bg-elevated);
  border: 1px solid var(--dsc-border);
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  color: var(--dsc-text);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.learn-featured a:hover {
  border-color: rgba(0, 174, 239, 0.4);
  box-shadow: 0 4px 20px rgba(0, 174, 239, 0.08);
}
.learn-featured-img {
  aspect-ratio: 16/9;
  background: var(--dsc-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.learn-featured-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.learn-featured-img .placeholder-icon {
  font-size: 48px;
  color: var(--dsc-text-muted);
  opacity: 0.3;
}
.learn-featured-body {
  padding: 28px 28px 28px 4px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.learn-featured-body .category-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--dsc-primary);
  margin-bottom: 10px;
}
.learn-featured-body h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.3;
}
.learn-featured-body .excerpt {
  color: var(--dsc-text-muted);
  font-size: 15px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
}
.learn-featured-body .meta {
  font-size: 13px;
  color: var(--dsc-text-muted);
}

/* Card Grid */
.learn-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 60px;
}

/* Article Card */
.learn-card {
  background: var(--dsc-bg-elevated);
  border: 1px solid var(--dsc-border);
  border-radius: 10px;
  overflow: hidden;
  text-decoration: none;
  color: var(--dsc-text);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.learn-card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 174, 239, 0.4);
  box-shadow: 0 4px 20px rgba(0, 174, 239, 0.08);
}
.learn-card-img {
  aspect-ratio: 16/9;
  background: var(--dsc-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.learn-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.learn-card-img .placeholder-icon {
  font-size: 36px;
  color: var(--dsc-text-muted);
  opacity: 0.3;
}
.learn-card-body {
  padding: 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.learn-card-body .category-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--dsc-primary);
  margin-bottom: 6px;
}
.learn-card-body h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.35;
}
.learn-card-body .excerpt {
  color: var(--dsc-text-muted);
  font-size: 13px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}
.learn-card-body .meta {
  font-size: 12px;
  color: var(--dsc-text-muted);
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--dsc-border);
}

/* Empty state */
.learn-empty {
  text-align: center;
  padding: 60px 24px;
  color: var(--dsc-text-muted);
  grid-column: 1 / -1;
}
.learn-empty i {
  font-size: 48px;
  margin-bottom: 12px;
  display: block;
}

/* ── Article detail page ──────────────────── */
.learn-article {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 24px 20px;
}
.learn-article-breadcrumb {
  font-size: 13px;
  color: var(--dsc-text-muted);
  margin-bottom: 20px;
}
.learn-article-breadcrumb a {
  color: var(--dsc-primary);
  text-decoration: none;
}
.learn-article-breadcrumb a:hover {
  text-decoration: underline;
}
.learn-article-header .category-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--dsc-primary);
  margin-bottom: 10px;
}
.learn-article h1 {
  font-size: 34px;
  font-weight: 700;
  color: var(--dsc-text);
  margin-bottom: 12px;
  line-height: 1.25;
}
.learn-article-meta {
  font-size: 14px;
  color: var(--dsc-text-muted);
  margin-bottom: 32px;
}
.learn-article-hero-img {
  width: 100%;
  border-radius: 10px;
  margin-bottom: 32px;
  aspect-ratio: 16/9;
  object-fit: cover;
}
.learn-article-content {
  color: var(--dsc-text);
  line-height: 1.8;
  font-size: 16px;
}
.learn-article-content p {
  margin-bottom: 18px;
}
.learn-article-content h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 32px 0 12px;
}
.learn-article-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 24px 0 10px;
}
.learn-article-content ul,
.learn-article-content ol {
  padding-left: 24px;
  margin-bottom: 18px;
}
.learn-article-content a {
  color: var(--dsc-primary);
}
.learn-article-content img {
  max-width: 100%;
  border-radius: 8px;
  margin: 16px 0;
}
.learn-article-content blockquote {
  border-left: 3px solid var(--dsc-primary);
  padding: 12px 20px;
  margin: 20px 0;
  background: var(--dsc-bg-elevated);
  border-radius: 0 8px 8px 0;
  color: var(--dsc-text-muted);
}

/* More Articles */
.learn-more {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 60px;
  border-top: 1px solid var(--dsc-border);
  padding-top: 40px;
}
.learn-more h2 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 20px;
  text-align: center;
}
.learn-more-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* ── Responsive ───────────────────────────── */
@media (max-width: 1024px) {
  .learn-grid,
  .learn-more-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 640px) {
  .learn-hero { padding: 40px 16px 12px; }
  .learn-hero h1 { font-size: 28px; }
  .learn-categories { padding: 16px 16px 24px; }
  .learn-featured { padding: 0 16px; margin-bottom: 24px; }
  .learn-featured a {
    grid-template-columns: 1fr;
  }
  .learn-featured-body {
    padding: 20px;
  }
  .learn-featured-body h2 { font-size: 20px; }
  .learn-grid,
  .learn-more-grid {
    grid-template-columns: 1fr;
    padding: 0 16px 40px;
  }
  .learn-article { padding: 24px 16px 20px; }
  .learn-article h1 { font-size: 26px; }
  .learn-more { padding: 40px 16px 40px; }
}