:root {
  --primary-color: #3498db;
  --secondary-color: #2ecc71;
  --accent-color: #f1c40f;
  --bg-color: #f9f9f9;
  --text-color: #333;
  --border-color: #ddd;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  padding: 20px;
}

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

header {
  text-align: center;
  margin-bottom: 40px;
}

h1, h2, h3 {
  margin-bottom: 20px;
  color: var(--primary-color);
}

.card {
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 20px;
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: 600;
}

input[type="number"],
input[type="text"],
select {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 16px;
}

button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 12px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #2980b9;
}

.results {
  background-color: #f8f9fa;
  padding: 20px;
  border-radius: 8px;
  border-left: 5px solid var(--secondary-color);
}

.result-item {
  margin-bottom: 15px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--border-color);
}

.result-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.result-value {
  font-weight: bold;
  color: var(--secondary-color);
}

.chart-container {
  margin-top: 30px;
  height: 300px;
}

@media (max-width: 768px) {
  .container {
    padding: 10px;
  }
  
  input[type="number"],
  input[type="text"],
  select {
    font-size: 14px;
  }
  
  button {
    padding: 10px 15px;
    font-size: 14px;
  }
}