/* BARRA DI PROGRESSO LETTURA */
.read-progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-neon), var(--primary-emerald));
  width: 0%;
  z-index: 101;
}

/* LAYOUT GRIGLIA ARTICOLO */
.article-wrapper {
  padding-top: 140px;
  padding-bottom: 80px;
}

.grid-article {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
}

/* SIDEBAR & TOC */
.article-sidebar {
  position: sticky;
  top: 100px;
}

.toc-title {
  font-family: var(--font-heading);
  font-size: 16px;
  margin-bottom: 16px;
  color: #fff;
}

.toc-list {
  list-style: none;
}

.toc-list li {
  margin-bottom: 12px;
}

.toc-list a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s ease;
}

.toc-list a:hover {
  color: var(--primary-neon);
}

/* MAIN ARTICLE STYLES */
.article-header {
  margin-bottom: 32px;
}

.article-title {
  font-family: var(--font-heading);
  font-size: 42px;
  line-height: 1.2;
  margin: 16px 0;
}

.article-meta {
  font-size: 14px;
  color: var(--text-secondary);
}

.lead-text {
  font-size: 20px;
  line-height: 1.6;
  color: #e2e8f0;
}

.article-divider {
  border: 0;
  height: 1px;
  background: var(--border-card);
  margin: 32px 0;
}

.article-body h2 {
  font-family: var(--font-heading);
  font-size: 26px;
  margin: 40px 0 16px;
  color: #fff;
}

.article-body p {
  color: var(--text-secondary);
  font-size: 17px;
  margin-bottom: 20px;
  line-height: 1.7;
}

.article-body ul {
  margin: 0 0 24px 20px;
  color: var(--text-secondary);
}

.article-body li {
  margin-bottom: 8px;
  font-size: 16px;
}

/* CALLOUT & PROMO BOX */
.callout-box {
  background: rgba(0, 255, 136, 0.05);
  border-left: 4px solid var(--primary-neon);
  padding: 20px;
  border-radius: 0 12px 12px 0;
  margin: 28px 0;
  display: flex;
  gap: 16px;
  color: var(--text-primary);
}

.callout-icon {
  font-size: 24px;
}

.promo-card {
  margin-top: 48px;
  text-align: center;
  background: radial-gradient(circle at top left, rgba(0, 255, 136, 0.1), transparent 70%), var(--bg-card);
}

.promo-card h3 {
  font-family: var(--font-heading);
  font-size: 22px;
  margin-bottom: 12px;
}

.promo-card p {
  margin-bottom: 24px;
}

/* RESPONSIVE */
@media (max-width: 900px) {
  .grid-article {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    display: none;
  }
  .article-title {
    font-size: 30px;
  }
}