:root {
  --ref-gap: 1.25rem;
  --ref-radius: 12px;
  --ref-card-bg: #f8fafc;
  --ref-border: #e5e7eb;
  --ref-muted: #6b7280;
}

#reference { background: var(--light-bg, #f3f4f6); }
#reference .container { width: min(1100px,92vw); margin-inline: auto; }
#reference h2 { margin: 0 0 1rem 0; }

.ref-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--ref-gap);
}
@media (max-width: 768px) {
  .ref-grid { grid-template-columns: 1fr; }
}

.ref-card {
  background: var(--ref-card-bg);
  border: 1px solid var(--ref-border);
  border-radius: var(--ref-radius);
  box-shadow: 0 0 50px rgba(0,0,0,0.4);
  padding: 1rem;
  display: grid;
  grid-template-columns: 100px 1fr; 
  grid-column-gap: 1rem;
  transition: transform .15s ease;
}
@media (hover: hover) and (pointer: fine) {
  .ref-card:hover { transform: translateY(-2px); }
}

.ref-thumb {
  width: 100px;
  height: 100px;
  border-radius: 10px;
  object-fit: cover;
  background: #e5e7eb;
  margin-bottom: .5rem;
}

.ref-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  font-size: 0.9rem;
}
.ref-year {
  font-weight: 600;
  margin-top: .25rem;
  color: var(--accent);
}
.ref-location {
  color: var(--ref-muted);
  font-size: 0.85rem;
}

.ref-content {
  display: flex;
  flex-direction: column;
}

.ref-title {
  margin: 0 0 .35rem 0;
  font: 600 1.1rem/1.25 var(--font, "Aptos","Inter","Segoe UI",Roboto,Arial,sans-serif);
  color: #333;
}

.ref-summary {
  margin: 0 0 .75rem 0;
  color: #333;
  line-height: 1.45;
}

.ref-quote {
  margin: 0 0 .5rem 0;
  font-size: 0.9rem;
  font-style: italic;
  color: var(--accent);
}

.ref-author {
  color: #333;
  font-weight: 500;
}

@media (prefers-reduced-motion: reduce) {
  .ref-card { transition: none; }
  .ref-card:hover { transform: none; }
}

@media (min-width: 900px) {
  #reference .ref-grid {
    row-gap: 3.5rem; 
  }
}

@media (max-width: 768px) {
  #reference .ref-grid {
    position: relative;
    min-height: clamp(460px, 62vh, 560px);
  }

  #reference .ref-card {
    position: absolute;
    inset: 0;
    opacity: 0;
    pointer-events: none;
    transition: opacity 300ms ease;
    padding: .95rem;

    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;       
    grid-template-areas:
      "content"
      "info";
    row-gap: 1.1rem;                     
  }
  #reference .ref-card.is-active {
    opacity: 1;
    pointer-events: auto;
  }

  #reference .ref-content {
    grid-area: content;
    display: grid;
    grid-template-rows: auto auto auto auto; 
    align-content: start;
    gap: .6rem;                              
    border-left: 3px solid rgba(0,208,240,0.22);
    padding-left: .7rem;
  }
  #reference .ref-title { margin: 0; }
  #reference .ref-summary {
    margin: 0;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  #reference .ref-quote { margin-top: .9rem; }
  #reference .ref-author { margin-top: .3rem; }

  #reference .ref-info {
    grid-area: info;
    display: grid;
    grid-template-columns: 120px 1fr;  
    grid-template-rows: auto auto;     
    align-items: center;
    column-gap: .85rem;
    row-gap: .00rem;                   
    font-size: .95rem;
  }
  #reference .ref-thumb {
    grid-column: 1;
    grid-row: 1 / span 2;            
    width: 120px;                      
    height: 120px;
    border-radius: 10px;
    object-fit: cover;
    margin: 0;
  }
  #reference .ref-year {
    grid-column: 2;
    grid-row: 1;
    margin: 0;
    white-space: nowrap;
  }
  #reference .ref-location {
    grid-column: 2;
    grid-row: 2;
    font-size: .95rem;
    color: var(--ref-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin: 0;
  }
}

@media (max-width: 768px) and (prefers-reduced-motion: reduce) {
  #reference .ref-grid {
    position: static;
    min-height: unset;
  }
  #reference .ref-card {
    position: static;
    opacity: 1;
    pointer-events: auto;
    transition: none;
  }
}