body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 800px;
    text-align: center;
}

h1, h2 {
    color: #333;
    margin-bottom: 20px;
}

p {
    color: #555;
    margin-bottom: 15px;
}

.form-group {
    margin-bottom: 15px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #333;
    font-weight: bold;
}

.form-group input[type="text"],
.form-group input[type="email"] {
    width: calc(100% - 20px);
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1em;
}

.start-button, .submit-button {
    background-color: #007bff;
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.1em;
    transition: background-color 0.3s ease;
    margin-top: 20px;
}

.start-button:hover, .submit-button:hover {
    background-color: #0056b3;
}

.question-block {
    margin-bottom: 20px;
    text-align: left;
}

.question-block p {
    font-size: 1.1em;
    color: #333;
    margin-bottom: 10px;
}

.question-block input[type="radio"] {
    margin-right: 10px;
}

.question-block label {
    font-size: 1em;
    color: #555;
    cursor: pointer;
}

hr {
    border: 0;
    border-top: 1px solid #eee;
    margin: 30px 0;
}

.timer {
    font-size: 1.2em;
    color: #d9534f;
    font-weight: bold;
    margin-bottom: 20px;
}

.iq-score {
    font-size: 3em;
    color: #28a745;
    font-weight: bold;
    margin: 20px 0;
}