/* ==========================================================================
   Responsive Stylesheet (css/responsive.css)
   Mobile-First & Breakpoint Adjustments
   ========================================================================== */

/* --------------------------------------------------------------------------
   Laptops & Medium Desktops (max-width: 1024px)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  :root {
    --header-height: 78px;
  }

  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .book-presentation-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .edition-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .footer-grid {
    grid-template-columns: 1.2fr 1fr 1fr;
    gap: 36px;
  }
}

/* --------------------------------------------------------------------------
   Tablets (max-width: 868px)
   -------------------------------------------------------------------------- */
@media (max-width: 868px) {
  /* Mobile Hamburger Navigation */
  .mobile-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(245, 240, 229, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    justify-content: flex-start;
    padding: 40px 30px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.3s ease, visibility 0.35s;
    border-bottom: 2px solid var(--color-gold);
    overflow-y: auto;
  }

  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    gap: 24px;
    width: 100%;
    text-align: center;
  }

  .nav-link {
    font-size: 1.25rem;
    padding: 10px 0;
    display: block;
  }

  /* Hero Section */
  .hero-section {
    padding: 50px 0 70px 0;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-content {
    order: 1;
  }

  .hero-portrait-wrapper {
    order: 2;
    max-width: 440px;
    margin: 0 auto;
  }

  .gold-line-reveal {
    margin: 16px auto 20px auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }

  /* Book Section */
  .book-section {
    padding: 70px 0;
  }

  .book-presentation-grid {
    grid-template-columns: 1fr;
    gap: 50px;
    text-align: center;
  }

  .book-stage {
    order: 1;
  }

  .book-meta-details {
    order: 2;
    align-items: center;
  }

  .book-specs-card {
    text-align: left;
    width: 100%;
  }

  .book-cta-group {
    justify-content: center;
  }

  /* 3D Book adjustment on mobile */
  .book-3d {
    max-width: 300px;
    transform: rotateY(-6deg) rotateX(2deg);
  }

  /* Edition Section */
  .edition-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .edition-quote {
    text-align: left;
  }

  /* Honors Banner */
  .honors-banner {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 30px 24px;
    gap: 20px;
  }

  .honors-icon {
    margin: 0 auto;
  }

  /* Home Highlight Card */
  .home-highlight-card {
    grid-template-columns: 1fr;
    padding: 30px 22px;
    gap: 26px;
  }

  /* Contact Page */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
    text-align: center;
  }

  .footer-links a:hover {
    transform: none;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* --------------------------------------------------------------------------
   Mobile Phones (max-width: 580px)
   -------------------------------------------------------------------------- */
@media (max-width: 580px) {
  :root {
    --header-height: 72px;
  }

  .container {
    padding-left: 18px;
    padding-right: 18px;
  }

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

  .brand-dates {
    font-size: 0.8rem;
  }

  .btn {
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .book-cta-group {
    flex-direction: column;
    width: 100%;
  }

  /* Gallery Grid */
  .gallery-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* Lightbox on mobile */
  .lightbox {
    padding: 14px;
  }

  .lightbox-nav-btn {
    width: 42px;
    height: 42px;
    font-size: 1.1rem;
  }

  .lightbox-prev {
    left: 4px;
  }

  .lightbox-next {
    right: 4px;
  }

  .lightbox-img {
    max-height: 65vh;
    max-width: 95vw;
  }

  .lightbox-caption-area {
    font-size: 0.88rem;
  }

  /* Reader Toolbar on mobile */
  .reader-toolbar {
    padding: 10px 12px;
    justify-content: center;
  }

  .reader-toolbar-group {
    flex-wrap: wrap;
    justify-content: center;
  }

  .reader-viewport {
    min-height: 420px;
    padding: 15px 10px;
  }

  .naoum-text-block {
    padding: 24px 18px;
  }

  .contact-card {
    padding: 26px 20px;
  }

  .phone-link {
    font-size: 1.45rem;
  }
}