.page-header {
  position: relative;
  top: 0;
  left: 0;
  height: 100px;
  background-image: url("../img/site/abstract.webp");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  width: 100%;
}

.card-container {
  position: relative;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: space-around;
  align-items: center;
  gap: 1.5rem;
}

.menu-card {
  width: 170px;
  height: 230px;
  border-radius: var(--border-radius);
  overflow: hidden;
  position: relative;
  box-shadow: var(--box-shadow);
}  

.menu-card a,
.menu-card a:hover {
  color: var(--btn-clr);
}

.menu-card:hover .menu-card-content {
  right: 0;
}

.menu-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.menu-card-content {
  display: flex;
  flex-direction: column;
  justify-content: space-evenly;
  text-align: center;
  position: absolute;
  top: 0;
  right: -100%;
  width: 100%;
  height: 100%; 
  padding: 0 8px; 
  background-color: rgba(255,255,255,0.7); 
  backdrop-filter: blur(5px);
  transition: 1s;
}

.menu-card-content:hover {
  min-height: 180px;
  height: 100%;
  transition: 0.25s;
}

.card-title {
  text-transform: uppercase;
  color: black;
  z-index: 5;
}

.btn {
  color: var(--btn-link-clr);
  background-color: var(--btn-bg-clr);
  padding: 8px 12px;
  border-radius: var(--border-radius);
  text-transform: capitalize;
  border: none;
  outline: none;
  font-weight: 500;
  cursor: pointer;
}

.btn:hover {
  color: var(--btn-link-hover-color);
  background-color: var(--btn-hover-bg-clr);
}

@media only screen and (max-width: 660px) {
  .quickNav-bar {display: none;}
  #publications { display: block;
  }

 
}

@media only screen and (min-width: 661px) {
  .container { margin-top: 1rem; } 
  .card-container { margin-top: 3rem; }
  #publications { display: none; }
}