/* Responsive Breakpoints & Adaptations */

/* Mobile Phones (Up to 480px) */
@media (max-width: 480px) {
  .header-container {
    padding: 0 12px;
  }

  .brand-title {
    font-size: 1.05rem;
  }

  .brand-subtitle {
    font-size: 0.7rem;
  }

  .chapter-grid {
    grid-template-columns: 1fr;
  }

  .tab-btn {
    padding: 12px 14px;
    font-size: 0.85rem;
  }

  .dialogue-bubble {
    max-width: 95%;
  }

  .btn {
    width: 100%;
  }
}

/* Tablets (768px and up) */
@media (min-width: 768px) {
  .chapter-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .main-content {
    padding-top: 24px;
    padding-bottom: 48px;
  }

  .btn {
    width: auto;
  }
}

/* Desktop & Laptops (1024px and up) */
@media (min-width: 1024px) {
  .chapter-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .header-container {
    height: 72px;
  }

  .brand-title {
    font-size: 1.35rem;
  }

  .brand-subtitle {
    font-size: 0.85rem;
  }

  .brand-logo {
    width: 48px;
    height: 48px;
  }
}

/* Large Screens (1440px and up) */
@media (min-width: 1440px) {
  .container {
    max-width: 1200px;
  }
}