body { font-family: Arial, sans-serif; background: #f4f4f9; margin: 0; padding: 0; }
.container { max-width: 600px; margin: 50px auto; background: #fff; padding: 20px; border-radius: 10px; box-shadow: 0 0 15px rgba(0,0,0,0.1); }
h1 { color: #2c3e50; }
label { display: block; margin: 10px 0; }
input { width: 100%; padding: 8px; margin-top: 4px; }
button { padding: 10px 20px; margin-top: 10px; background-color: #2c3e50; color: #fff; border: none; border-radius: 5px; cursor: pointer; }
button:hover { background-color: #34495e; }
#result { margin-top: 20px; padding: 10px; background: #ecf0f1; border-radius: 5px; }