/* --- Main Layout --- */
.seo-main {
  flex-grow: 1;
  padding-top: 60px;
  padding-bottom: 64px;
}

/* --- Hero Showcase Section --- */
.seo-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 80px;
}

@media (min-width: 1024px) {
  .seo-hero {
    grid-template-columns: 1fr 1.2fr;
  }
}

.seo-hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.seo-hero-title {
  font-family: var(--font-heading);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--color-primary);
}

.seo-hero-desc {
  font-size: var(--fs-body-lg);
  line-height: var(--lh-body-lg);
  color: var(--color-secondary-text);
}

/* --- Interactive Live Demo Box --- */
.seo-demo-box {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 20px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.03);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.seo-chart-container {
  width: 100%;
  height: 320px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  overflow: hidden;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.seo-demo-controls {
  display: none !important;
}

.demo-checkbox-group {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
}

.demo-btn-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}
.demo-btn-action:hover {
  background-color: var(--color-surface-variant);
}

/* --- Deep-Dive Content Layout --- */
.seo-content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 64px;
  margin-bottom: 80px;
}

@media (min-width: 1024px) {
  .seo-content-grid {
    grid-template-columns: 2fr 1fr;
  }
}

.seo-article {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.seo-article h2 {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 12px;
  border-left: 4px solid var(--color-indigo);
  padding-left: 16px;
}

.seo-article p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-secondary-text);
}

.seo-article ul {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.seo-article li {
  font-size: 15px;
  color: var(--color-secondary-text);
  line-height: 1.5;
}

.seo-article strong {
  color: var(--color-primary);
}

/* --- Sidebar Navigation --- */
.seo-sidebar {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.seo-sidebar-widget {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.widget-title {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
}

.gallery-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.gallery-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  color: var(--color-secondary-text);
}
.gallery-link:hover {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
}
.gallery-link.active {
  background-color: rgba(99, 102, 241, 0.06);
  color: var(--color-indigo);
}
.gallery-link .material-symbols-outlined {
  font-size: 16px !important;
}

/* --- CTA Block --- */
.seo-cta-section {
  text-align: center;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(16, 185, 129, 0.05));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: 60px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}
.seo-cta-section h3 {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 600;
  color: var(--color-primary);
}
.seo-cta-section p {
  font-size: 16px;
  color: var(--color-secondary-text);
  max-width: 600px;
}

@media (max-width: 767px) {
  .seo-demo-box {
    padding: 12px;
  }
  .seo-chart-container {
    height: 280px;
  }
  .gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 8px;
  }
  .seo-cta-section {
    padding: 40px 20px;
  }
  .seo-cta-section h3 {
    font-size: 24px;
  }
}