body {
  font-family: system-ui, -apple-system, Arial, sans-serif;
  margin: 20px;
  background: #f5f5f5;
}
.container {
  max-width: 1400px;
  margin: 0 auto;
  background: white;
  padding: 24px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}
header {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: nowrap;
  margin-bottom: 20px;
  overflow-x: auto;
}
h1 {
  font-size: 22px;
  margin: 0rem;
  margin-right: 2rem;
  margin-left: 1rem;
  color: #333;
  max-width: 80px;
  line-height: 1.2;
}
.controls {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: nowrap;
}
.controls button {
  padding: 8px 16px;
  font-size: 14px;
  border: 1px solid #ddd;
  background: white;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}
.controls button:hover {
  background: #f0f0f0;
  border-color: #999;
}
.controls button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.controls button:disabled:hover {
  background: white;
  border-color: #ddd;
}
.controls select {
  padding: 8px 12px;
  font-size: 14px;
  border: 1px solid #ddd;
  border-radius: 4px;
  background: white;
}
.week-label {
  font-size: 14px;
  color: #666;
  font-weight: 500;
  min-width: 220px;
  text-align: center;
}
#chartContainer {
  position: relative;
  height: 83vh;
  margin-top: 20px;
}
.legend {
  margin-top: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}
.legend-label {
  font-size: 14px;
  color: #666;
}
.legend-gradient {
  width: 300px;
  height: 20px;
  background: linear-gradient(90deg, #27ae60 0%, #f39c12 50%, #e74c3c 100%);
  border: 1px solid #ddd;
  border-radius: 4px;
}
.legend-ticks {
  display: flex;
  width: 300px;
  justify-content: space-between;
  font-size: 12px;
  color: #666;
}