body, html {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f0f0;
}

form {
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 300px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}

input[type="text"],
input[type="email"],
input[type="tel"],
select {
    width: 100%;
    padding: 8px;
    margin-bottom: 15px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

input[type="radio"],
input[type="checkbox"] {
    display: none;
}

input[type="radio"] + label,
input[type="checkbox"] + label {
    position: relative;
    padding-left: 25px;
    cursor: pointer;
    display: inline-block;
    color: #666;
}

input[type="radio"] + label::before,
input[type="checkbox"] + label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 15px;
    height: 15px;
    border: 2px solid #ccc;
    border-radius: 50%;
    background: #fff;
}

input[type="checkbox"] + label::before {
    border-radius: 4px;
}

input[type="radio"]:checked + label::before,
input[type="checkbox"]:checked + label::before {
    border-color: #4CAF50;
    background: #4CAF50;
}

input[type="radio"]:checked + label::after,
input[type="checkbox"]:checked + label::after {
    content: '';
    position: absolute;
    left: 4px;
    top: 50%;
    transform: translateY(-50%);
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #fff;
}

input[type="checkbox"]:checked + label::after {
    width: 7px;
    height: 12px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: translateY(-50%) rotate(45deg);
}

input[type="submit"] {
    width: 100%;
    padding: 10px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s, transform 0.2s;
}

input[type="submit"]:hover {
    background-color: #45a049;
    transform: scale(1.05);
}

input[type="submit"]:active {
    background-color: #3e8e41;
    transform: scale(0.95);
}

input.invalid {
    background-color: red !important;
}