/* ==========================================================================
   Newsletter — Index page (article listing) + article page
   ========================================================================== */

/* --- Index section --- */
.newsletter-section {
  padding: 6rem 0;
}

/* --- Article card (on index page) --- */
.newsletter-card {
  display: block;
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2.5rem 2rem;
  margin-bottom: 2rem;
  overflow: hidden;
  box-shadow: 0 2px 12px var(--shadow-color);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  text-decoration: none;
  color: inherit;
}

.newsletter-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.newsletter-card:hover {
  transform: translateY(-4px);
  border-color: rgba(var(--accent-primary-rgb), 0.25);
  box-shadow: 0 12px 40px var(--shadow-color);
  color: inherit;
}

.newsletter-card:hover::before {
  opacity: 1;
}

/* Featured card — larger */
.newsletter-card.featured {
  padding: 3rem 3rem 2.5rem;
}

.newsletter-card.featured::before {
  opacity: 1;
}

.newsletter-card.featured h2 {
  font-size: clamp(1.4rem, 3vw, 1.8rem);
}

/* Badge */
.newsletter-card-badge {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  background: var(--accent-gradient);
  color: var(--text-on-accent);
}

/* Meta: date + tag */
.newsletter-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.newsletter-date {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.newsletter-date svg {
  stroke: var(--text-muted);
  flex-shrink: 0;
}

.newsletter-tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
  border-radius: 50px;
  background: rgba(var(--accent-primary-rgb), 0.08);
  color: var(--accent-primary);
  border: 1px solid rgba(var(--accent-primary-rgb), 0.15);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.newsletter-card h2 {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.newsletter-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

.newsletter-read-more {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-primary);
  transition: gap 0.25s ease;
}

.newsletter-card:hover .newsletter-read-more {
  gap: 0.7rem;
}

.newsletter-read-more svg {
  stroke: var(--accent-primary);
  transition: transform 0.25s ease;
}

.newsletter-card:hover .newsletter-read-more svg {
  transform: translateX(3px);
}

/* --- Article page --- */
.article-section {
  padding: 6rem 0;
}

.article-wrap {
  max-width: 900px;
  margin: 0 auto;
  background: var(--bg-primary);
  padding: 3rem 3rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 24px var(--shadow-color);
}

[data-theme="dark"] .article-wrap {
  background: rgba(13, 17, 23, 0.95);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.article-wrap h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 2rem;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 2.5rem 0 1rem;
}

.article-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 2rem 0 0.75rem;
}

.article-body p {
  margin-bottom: 1.25rem;
}

.article-body ul,
.article-body ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body strong {
  color: var(--text-primary);
  font-weight: 600;
}

.article-body blockquote {
  border-left: 3px solid var(--accent-primary);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: rgba(var(--accent-primary-rgb), 0.04);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-secondary);
}

.article-body a {
  color: var(--accent-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

/* Divider */
.article-divider {
  border: none;
  height: 1px;
  background: var(--border-color);
  margin: 3rem 0;
}

/* Back link */
.article-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 2rem;
  transition: gap 0.25s ease;
}

.article-back:hover {
  gap: 0.7rem;
  color: var(--accent-primary);
}

.article-back svg {
  transition: transform 0.25s ease;
}

.article-back:hover svg {
  transform: translateX(-3px);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .newsletter-card {
    padding: 2rem 1.5rem 1.5rem;
  }
  .newsletter-card.featured {
    padding: 2rem 1.5rem 1.5rem;
  }
  .article-wrap {
    padding: 2rem 1.5rem;
    margin: 0 0.5rem;
  }
}