body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f7fa;
}

header {
  background: #283655;
  color: #fff;
  padding: 1.5rem 0;
  text-align: center;
  margin-bottom: 2rem;
}

#card-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 32px 32px;
}

.card {
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 3px 16px #0001;
  padding: 1.5rem;
  transition: box-shadow .18s;
  cursor: pointer;
  min-height: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.card:hover {
  box-shadow: 0 6px 24px #0003;
}

.card .card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1rem 0 0.5rem 0;
}

.card .preview-canvas {
  width: 140px;
  height: 140px;
  background: #dde6f2;
  border-radius: 12px;
  margin-bottom: 1rem;
  display: block;
}

/*      */
.model-pair {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
}

@media (max-width: 900px) {
  #card-list {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 600px) {
  #card-list {
    grid-template-columns: 1fr;
    padding: 0 8px 24px;
  }
}