.bathymetry-card {
  background: #eaf6fb;
  border: 1px solid #9bc8db;
  border-radius: 8px;
  margin: 1rem 0;
  padding: 0.85rem;
}
.bathymetry-card h3 { margin: 0 0 0.35rem; }
.bathymetry-card p { margin: 0.35rem 0 0.65rem; }
.bathymetry-button {
  background: #075985;
  border: 0;
  border-radius: 6px;
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 0.55rem 0.8rem;
}
.bathymetry-legend {
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(0, 0, 0, 0.18);
  border-radius: 6px;
  box-shadow: 0 1px 5px rgba(0, 0, 0, 0.25);
  color: #18333f;
  font: 12px/1.35 system-ui, sans-serif;
  max-width: 220px;
  padding: 8px 10px;
}
.bathymetry-legend strong, .bathymetry-legend small { display: block; }
.bathymetry-legend small { margin-top: 4px; }
.bathymetry-line-sample {
  border-top: 3px solid #075985;
  display: inline-block;
  margin-right: 6px;
  vertical-align: middle;
  width: 28px;
}