body { font-family: Arial, sans-serif; background: #f4f4f4; padding: 20px; }
.calculator { max-width: 600px; margin: 0 auto; background: #fff; padding: 25px; border-radius: 10px; box-shadow: 0 0 15px rgba(0,0,0,0.1); }
h2 { text-align: center; color: #fff; background: #007bff; padding: 15px; border-radius: 8px; }
label { display: block; margin-top: 15px; font-weight: bold; }
input, select { width: 100%; padding: 10px; margin-top: 5px; border-radius: 5px; border: 1px solid #ccc; box-sizing: border-box; }
.radio-group { margin-top: 10px; }
.radio-group input { width: auto; margin-right: 10px; }
button { margin-top: 20px; padding: 12px 20px; background: #28a745; color: white; border: none; border-radius: 5px; cursor: pointer; width: 100%; font-size: 16px; }
button:hover { background: #218838; }
.result { margin-top: 25px; background: #f9f9f9; padding: 15px; border-radius: 5px; border: 1px solid #ddd; }
.result h3 { margin-top: 0; color: #333; }
.result p { margin: 5px 0; }