/* ==========================================================================
   Responsive Web Design (RWD) & Mobile Adjustments
   ========================================================================== */

/* ========================== TABLETS & DESKTOPS (<= 992px) ========================== */
@media (max-width: 992px) {
  h1 {
    font-size: 2.2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }

  .section {
    padding: var(--spacing-xl) 0;
  }

  .hero {
    min-height: auto;
    padding: 120px 0 var(--spacing-xxl);
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xxl);
    text-align: center;
  }

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

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

  .hero-visual {
    order: -1; /* Display profile visual above on tablets/mobiles */
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .calc-wrapper {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

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

  .form-group.full-width {
    grid-column: auto;
  }
}

/* ========================== MOBILE DEVICES (<= 768px) ========================== */
@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
  }

  /* Transform Desktop Menu into sliding mobile glass drawer */
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-top: 1px solid var(--border-color);
    flex-direction: column;
    padding: var(--spacing-xxl) 0;
    gap: var(--spacing-xl);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s ease;
    z-index: 999;
  }

  .navbar.scrolled .nav-menu {
    top: 60px;
    height: calc(100vh - 60px);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-item {
    font-size: 1.2rem;
    width: 80%;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--spacing-md);
  }

  .nav-item::after {
    display: none;
  }

  /* Hamburger to Cross icon transition */
  .mobile-toggle.open span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .mobile-toggle.open span:nth-child(2) {
    opacity: 0;
  }

  .mobile-toggle.open span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  /* Reader Modal adaptations */
  .modal-container {
    width: 95%;
    max-height: 90vh;
  }

  .modal-body {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .reader-title {
    font-size: 1.6rem;
  }

  .reader-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
    padding-bottom: var(--spacing-sm);
  }

  .reader-cover {
    height: 200px;
    margin-bottom: var(--spacing-lg);
  }

  .reader-article-content {
    font-size: 1.05rem;
  }
  
  .reader-font-sm {
    font-size: 0.95rem;
  }
  .reader-font-md {
    font-size: 1.05rem;
  }
  .reader-font-lg {
    font-size: 1.15rem;
  }

  /* Activity selection button alignment stacking */
  .activity-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xs);
  }

  .activity-btn {
    flex-direction: row;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .activity-btn span:first-child {
    margin-bottom: 0;
  }
}

/* ========================== SMALL MOBILES (<= 480px) ========================== */
@media (max-width: 480px) {
  .hero-title {
    font-size: 2.2rem;
  }

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

  .hero-btns .btn {
    width: 100%;
    justify-content: center;
  }

  .nav-actions {
    gap: var(--spacing-sm);
  }

  .logo span {
    display: none; /* Only show icon on extremely small devices to fit screen */
  }
}