* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f5f5f5;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 30px;
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header h1 {
  color: #2c3e50;
  margin-bottom: 10px;
}

header p {
  color: #7f8c8d;
  font-size: 16px;
}

.upload-section {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  margin-bottom: 30px;
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

#csvFile {
  padding: 10px;
  border: 2px dashed #3498db;
  border-radius: 5px;
  background: #ecf0f1;
  cursor: pointer;
}

#processBtn {
  background: #3498db;
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  transition: background 0.3s;
}

#processBtn:hover:not(:disabled) {
  background: #2980b9;
}

#processBtn:disabled {
  background: #bdc3c7;
  cursor: not-allowed;
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.control-group label {
  font-weight: 600;
  color: #2c3e50;
}

.control-group input {
  padding: 8px;
  border: 1px solid #bdc3c7;
  border-radius: 4px;
  font-size: 14px;
}

.plots-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.plot {
  background: white;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  padding: 10px;
  min-height: 400px;
}

@media (max-width: 768px) {
  .upload-section {
    flex-direction: column;
  }
  
  .controls {
    grid-template-columns: 1fr;
  }
}