body {
  font-family: 'Merriweather', serif;
  background-color: #f9f9f9;
  color: #333;
  margin: 0;
  padding: 0;
}

header {
  background: #fff;
  padding: 1rem 2rem;
  border-bottom: 1px solid #ddd;
}

header nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #0056b3;
  font-weight: 600;
}

header h1 {
  margin-top: 1rem;
  font-size: 1.8rem;
  text-align: center;
}

#dataset-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.card {
  background: #fff;
  padding: 1rem;
  border: 1px solid #ddd;
  border-radius: 6px;
  transition: box-shadow 0.3s ease-in-out;
  text-align: center;
}

.card:hover {
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.1);
}

.card img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.card h2 {
  margin-top: 0.75rem;
  font-size: 1.2rem;
}

.card p {
  margin: 0.5rem 0 1rem;
  font-size: 0.95rem;
  color: #555;
}

.card a {
  color: #fff;
  background: #0056b3;
  padding: 0.5rem 1rem;
  text-decoration: none;
  border-radius: 4px;
  font-weight: 600;
}

.card a:hover {
  background: #003d80;
}

/* Actions row inside each card */
.card .actions {
  margin-top: 0.75rem;
  display: flex;
  justify-content: center;
  gap: 0.5rem;
}

/* Evaluation button style */
.card a.eval-btn {
  background: #ff7f50;
  padding: 0.5rem 1rem;
}
.card a.eval-btn:hover {
  background: #e0562f;
}

/* Detail page - side-by-side comparison */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  max-width: 1400px;
  margin: 2rem auto;
  padding: 0 2rem;
}

.comparison-item {
  text-align: center;
}

.comparison-item h2 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: #333;
}

.comparison-item img {
  width: 100%;
  height: auto;
  border: 1px solid #ddd;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Heatmap with legend layout */
.heatmap-with-legend {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  gap: 10px;
}

/* Main heatmap */
.heatmap-with-legend img.main-heatmap {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* Legend — tightly constrained */
.heatmap-with-legend img.heatmap-legend {
  max-height: 80px;   /* 🔥 equalizes column heights */
  width: auto;
  max-width: 100%;
  object-fit: contain;
}


.comparison-item img.heatmap-img {
  border: 1px solid #ddd;
}

#detail-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

#detail-container h1 {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 2rem;
  color: #333;
}

.back-btn {
  display: inline-block;
  margin-top: 2rem;
  padding: 0.75rem 1.5rem;
  background: #0056b3;
  color: #fff;
  text-decoration: none;
  border-radius: 4px;
  font-weight: 600;
  transition: background 0.3s ease;
}

.back-btn:hover {
  background: #003d80;
}