@media (max-width: 768px) {

  :root {
    --grid-gap: 12px;
  }

  body {
    padding-left:  var(--grid-gap);
    padding-right: var(--grid-gap);
  }

  .fullwidth {
  margin: 0;
  margin-right: 0;
  padding-left: 0;
  padding-right: 0;
}

  .grid-4,
  .grid-8 {
    grid-template-columns: 1fr;
    padding: 0;
  }

  .column-1,
  .column-2,
  .column-3,
  .column-4,
  .center-columns,
  .left-half-columns,
  .right-half-columns,
  .full-columns {
    grid-column: 1 / -1;
  }

  .right-half-columns {
    flex-wrap: wrap;
  }
  .grid-4-2 {
  grid-template-columns: repeat(2, 1fr);
  }

  .grid-4-2 > * {
    grid-column: auto;
  }

  .space-l  { margin-top: var(--space-16); margin-bottom: var(--space-16); }
  .space-xl { margin-top: var(--space-24); margin-bottom: var(--space-24); }

  .menu-nav {
    position: fixed;
    top:      40px;  
    left:     0;
    right:    0;
    z-index:  9998;
 
    transform:  translateY(-4px);
    opacity:    0;
    pointer-events: none;
 
    transition: opacity   var(--transition-slow),
                transform var(--transition-slow);
 
    padding:         var(--space-6) 16px;
    backdrop-filter: blur(12px);
 
  }
 
  [data-theme="dark"] .menu-nav {
    background: rgba(0, 0, 0, 0.92);
  }
 
  [data-theme="light"] .menu-nav,
  body:not([data-theme]) .menu-nav {
    background: rgba(255, 255, 255, 0.92);
  }
 
  .menu-nav.active {
    transform:      translateY(0);
    opacity:        1;
    pointer-events: auto;
  }
 
  .menu-nav ul {
    flex-direction: column;
    gap:            var(--space-5);
  }

  .bottom-bar__right {
    gap: var(--space-4);
  }

  .bottom-bar__title {
    display: none;
  }

  .bottom-bar__left {
    max-width: 40%;
  }

  .image-grid-bhsad {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--grid-gap);
  }

  .archive-phase-bhsad {
    grid-template-columns: 1fr;
  }

  .archive-phase-bhsad .right-half-columns {
    grid-column: 1 / -1;
  }

  .diploma-grid {
    grid-template-columns: 1fr;
    gap: var(--space-24);
  }

  .diploma-side img {
    width: 100%;
    display: block;
  }

  .diploma-center {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--grid-gap);
    width: 100%;
  }

  .diploma-book {
    width: 100%;
    display: block;
  }

  .diploma-book img {
    width: 100%;
    height: auto;
    display: block;
  }

  .phase-grid-childhood {
    grid-template-columns: repeat(2, 1fr);
  }

  .lockdown-grid {
    grid-template-columns: 1fr;
    gap: var(--space-16);
  }

  .project-info-header {
    flex-wrap: wrap;
  }

  .project-info {
    grid-column: 1 / -1;
  }

  .project-info-meta {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-6);

  }

  .separator {
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .control-btn {
    width:  var(--space-12);
    height: var(--space-12);
  }

  .lightbox__content {
    max-width:  95vw;
    max-height: 85vh;
  }

  .lightbox__img {
    max-width:  95vw;
    max-height: calc(85vh - 40px);
  }

  h1 { font-size: clamp(1.8rem, 8vw, 2.4rem); }
  h2 { font-size: clamp(1.4rem, 6vw, 2rem);   }

  iframe[src$=".pdf"] {
    display: none;
  }

  .pdf-mobile {
    width: 100%;
  }

  .pdf-mobile__link {
    display:         block;
    text-decoration: none;
    color:           inherit;
    border:          1px dotted currentColor;
    padding:         var(--space-6) var(--space-4);
    transition:      opacity var(--transition-base);
  }

  .pdf-mobile__link:hover {
    opacity: 0.7;
  }

  .pdf-mobile__inner {
    display:         flex;
    justify-content: space-between;
    align-items:     center;
    font-family:     var(--font-mono);
    font-size:       var(--text-base);
    text-transform:  uppercase;
  }

  .pdf-mobile__label {
    font-style: italic;
    opacity:    0.6;
  }

  .pdf-mobile__action {
    font-weight: 600;
  }

}

@media (max-width: 430px) {

  .image-grid-bhsad {
    grid-template-columns: repeat(2, 1fr);
  }

}