* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Noto Sans JP", sans-serif;
  font-optical-sizing: auto;
  font-style: normal;
}

body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  background-color: #f5f5f5;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

h1 {
  text-align: center;
  margin-bottom: 10px;
  color: #2c3e50;
}

h3.date-range {
  text-align: center;
  margin-bottom: 20px;
  color: #3498db;
  font-weight: 500;
  font-size: 1.1rem;
}

.chart-container {
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  padding: 20px;
  margin-bottom: 30px;
  height: 400px;
}

.chart-container h4 {
  text-align: center;
  margin-top: 0;
  margin-bottom: 15px;
  color: #34495e;
}

.data-info {
  text-align: center;
  padding: 15px;
}

footer {
  text-align: center;
  padding: 15px;
}

.error-message {
  color: #e74c3c;
  font-weight: bold;
  margin-top: 10px;
  display: none;
}

#loadingMessage {
  font-style: italic;
  color: #7f8c8d;
}