body {
    font-family: 'Arial', sans-serif;
    background-color: #eef2f7;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    transition: background-color 0.3s ease;
}

#quiz-container {
    width: 100%;
    max-width: 600px;
    background-color: #fff;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    text-align: center;
    transition: transform 0.3s ease;
}

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

#question-container {
    margin-bottom: 20px;
    font-size: 24px;
    font-weight: bold;
    color: #333;
}

#options {
    display: flex;
    flex-direction: column;
    margin-top: 10px;
}

button {
    padding: 12px;
    margin: 10px 0;
    border: none;
    background-color: #597179;
    color: white;
    font-size: 16px;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

button:hover {
    background-color: #45a049;
    transform: scale(1.05);
}

button:disabled {
    background-color: #ccc;
}

#navigation-bar {
    margin-top: 20px;
    display: flex;
    justify-content: center;
    gap: 10px;
}

#navigation-bar button {
    padding: 10px;
    background-color: #ff9800;
    color: white;
    border-radius: 50%;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

#navigation-bar button:hover {
    background-color: #fb8c00;
    transform: scale(1.05);
}

.selected-option {
    background-color: #d1f2c8;
}

#review-container {
    width: 100%;
    max-width: 600px;
    background-color: #fff;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    text-align: center;
}

#review-list {
    list-style-type: none;
    padding: 0;
    font-size: 18px;
}

.correct {
    color: green;
    font-weight: bold;
}

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

.review-item {
    margin-bottom: 15px;
    opacity: 0;
    animation: fadeIn 1s forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}