body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(to right, #4facfe, #00f2fe);
    margin: 0;
    padding: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    padding: 30px;
    max-width: 400px;
    width: 100%;
    text-align: center;
}

h1 {
    font-size: 24px;
    margin-bottom: 20px;
    color: #333;
}

label {
    display: block;
    margin: 15px 0 5px;
    font-weight: bold;
    color: #555;
}

input, select, button {
    width: 100%;
    padding: 10px;
    margin: 5px 0;
    border: 1px solid #ddd;
    border-radius: 5px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus, select:focus {
    border-color: #4facfe;
    box-shadow: 0 0 5px rgba(79, 172, 254, 0.5);
    outline: none;
}

button {
    background-color: #4facfe;
    color: white;
    font-weight: bold;
    cursor: pointer;
    border: none;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #00f2fe;
}

#result {
    margin-top: 20px;
    font-size: 18px;
    color: #333;
}

.error {
    color: red;
    font-weight: bold;
}