body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f8;
    color: #333;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: auto;
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    margin-bottom: 30px;
}

.question-block, .result-block {
    margin-bottom: 25px;
    padding: 15px;
    border-left: 4px solid #ccc;
    background: #f9f9f9;
    border-radius: 6px;
}

.result-block.correct {
    border-color: #4CAF50;
    background: #e8f5e9;
}

.result-block.incorrect {
    border-color: #f44336;
    background: #fdecea;
}

textarea {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
    margin-top: 10px;
    border-radius: 5px;
    border: 1px solid #ccc;
    resize: vertical;
}

button {
    display: block;
    margin: 30px auto 0;
    padding: 10px 30px;
    font-size: 1rem;
    background-color: #007BFF;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}

a {
    display: block;
    text-align: center;
    margin-top: 20px;
    color: #007BFF;
}