:root {
    --primary-color: #4caf50;
    --secondary-color: #333;
    --background-color: #f9f9f9;
}

body {
    font-family: Arial, sans-serif;
    background: var(--background-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.quiz-container {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    width: 400px;
    text-align: center;
}

h1 { color: var(--primary-color);}

.quiz-options {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.quiz-options li {
    padding: 0.5rem;
    background: #eee;
    margin-bottom: 0.5rem;
    cursor: pointer;
    border-radius: 5px;
}

.quiz-options li:hover,
.quiz-options li.selected {
    background: var(--primary-color);
    color: #fff;
}

button {
    padding: 0.5rem 1rem;
    margin-top: 1rem;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:disabled {
    background: #aaa;
}

#result {
    margin-top: 1rem;
}