/* ==========================================================================
   RESPONSIVE.CSS — MULTI-DEVICE BREAKPOINTS & VIEWPORT ADAPTATIONS
   Project: Personal Portfolio Website — Shanto Paul (DIU)
   Standards: Mobile-First Architecture, WCAG 2.1 AA Touch Targets
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Small Mobile Viewports (< 480px)
   -------------------------------------------------------------------------- */
@media (max-width: 479.98px) {
  :root {
    --navbar-height: 60px;
  }

  .container {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .btn {
    width: 100%;
    padding: 0.75rem 1rem;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: var(--space-sm);
  }

  .hero-avatar-ring {
    width: 180px !important;
    height: 180px !important;
  }

  .hero-floating-badge {
    font-size: 0.75rem !important;
    padding: 0.35rem 0.65rem !important;
  }

  .badge-pos-top-right {
    top: -5px !important;
    right: -5px !important;
  }

  .badge-pos-bottom-left {
    bottom: -5px !important;
    left: -5px !important;
  }

  .about-stats-grid {
    grid-template-columns: 1fr !important;
  }
}

/* --------------------------------------------------------------------------
   2. Mobile Viewports (< 768px)
   -------------------------------------------------------------------------- */
@media (max-width: 767.98px) {
  /* Bento Box collapse to single column */
  .bento-grid {
    grid-template-columns: 1fr;
    grid-auto-rows: auto;
    gap: var(--space-md);
  }

  /* Content Sections Mobile Adaptations */
  .about-grid {
    grid-template-columns: 1fr !important;
    gap: var(--space-xl) !important;
  }

  .timeline::before {
    left: 18px !important;
  }

  .timeline-marker {
    left: 8px !important;
    width: 22px !important;
    height: 22px !important;
  }

  .timeline-item {
    padding-left: 48px !important;
  }

  .timeline-card {
    padding: var(--space-lg) !important;
  }

  .skills-categories-grid {
    grid-template-columns: 1fr !important;
  }

  .experience-grid {
    grid-template-columns: 1fr !important;
  }

  /* Projects & Contact Mobile Adaptations */
  .contact-grid {
    grid-template-columns: 1fr !important;
    gap: var(--space-xl) !important;
  }

  .contact-form-card {
    padding: var(--space-xl) !important;
  }

  .footer-top {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: var(--space-xl) !important;
  }

  .footer-bottom {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: var(--space-lg) !important;
  }

  .bento-item--col-1,
  .bento-item--col-2,
  .bento-item--col-3,
  .bento-item--col-4 {
    grid-column: span 1;
  }

  .bento-item--row-1,
  .bento-item--row-2 {
    grid-row: span 1;
  }

  /* Navigation Drawer Setup */
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    height: 100dvh;
    background: var(--surface);
    border-left: 1px solid var(--border);
    padding: calc(var(--navbar-height) + var(--space-lg)) var(--space-lg) var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    box-shadow: var(--shadow-xl);
    transition: right var(--transition-normal);
    z-index: 1001;
    overflow-y: auto;
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-toggle {
    display: flex !important;
  }

  .nav-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
  }

  .nav-backdrop.active {
    opacity: 1;
    visibility: visible;
  }

  /* Projects Grid */
  .projects-grid {
    grid-template-columns: 1fr !important;
  }

  /* Prevent iOS automatic zoom on text inputs */
  input[type="text"],
  input[type="email"],
  textarea,
  select {
    font-size: 16px !important;
  }
}

/* --------------------------------------------------------------------------
   3. Tablet Viewports (768px - 1023px)
   -------------------------------------------------------------------------- */
@media (min-width: 768px) and (max-width: 1023.98px) {
  .container {
    padding-left: var(--space-xl);
    padding-right: var(--space-xl);
  }

  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: minmax(180px, auto);
    gap: var(--space-md);
  }

  .bento-item--col-3,
  .bento-item--col-4 {
    grid-column: span 2;
  }

  .projects-grid {
    grid-template-columns: repeat(2, 1fr) !important;
  }
}

/* --------------------------------------------------------------------------
   4. Desktop Viewports (>= 1024px)
   -------------------------------------------------------------------------- */
@media (min-width: 1024px) {
  .container {
    padding-left: var(--space-xl);
    padding-right: var(--space-xl);
  }

  .nav-toggle {
    display: none !important;
  }

  .nav-menu {
    display: flex !important;
    flex-direction: row;
    align-items: center;
    gap: var(--space-lg);
  }
}