.oil-viz-container {
  max-width: 900px;
  margin: 2rem auto;
  padding: 1.5rem;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  color: #1e293b;
}

.chart-wrapper {
  position: relative;
  height: 400px;
  width: 100%;
}

.oil-viz-header {
  margin-bottom: 1rem;
  border-bottom: 2px solid #f1f5f9;
  padding-bottom: 0.5rem;
}

.oil-viz-header h2 {
  margin: 0;
  font-size: 1.25rem;
  color: #0f172a;
}