#graph-section {
  margin: 3rem 0;
  width: 100%;
}

#controls {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 2rem;
}

.filter-btn {
  font-family: body;
  padding: 0.4rem 1rem;
  background-color: var(--white);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s ease-in-out;
  color: var(--blue);
}

.filter-btn.active {
  color: var(--white);
}

.track-line {
  stroke: var(--blue);
  stroke-dasharray: 4 4;
  stroke-width: 1;
  opacity: 0.6;
}

.drop-line {
  stroke: var(--blue);
  stroke-width: 1;
  opacity: 0.3;
}

.axis-line path,
.axis-line line {
  stroke: var(--blue);
}

.tooltip {
  position: absolute;
  background: rgba(255, 255, 255, 0.95);
  padding: 0.8rem;
  border: 1px solid var(--blue);
  color: var(--blue);
  font-family: body;
  font-size: 0.85rem;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  z-index: 10;
  text-align: left;
}