body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #dfe9f3, #f3dfe7);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.screen {
    text-align: center;
}

.hidden {
    display: none;
}

.main-btn {
    padding: 12px 20px;
    background: #333;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
}

.quiz-container {
    background: #ffffffcc;
    width: 350px;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 0 15px rgba(0,0,0,0.15);
    text-align: center;
    backdrop-filter: blur(4px);
}

.options {
    list-style: none;
    padding: 0;
}

.option-btn {
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    border: 1px solid #333;
    border-radius: 6px;
    cursor: pointer;
    background: #fafafa;
    transition: 0.25s;
    font-size: 15px;
}

.option-btn:hover {
    background: #e7e7e7;
}

.correct {
    background: #4CAF50 !important;
    color: white;
}

.wrong {
    background: #e63946 !important;
    color: white;
}

.disabled {
    pointer-events: none;
    opacity: 0.7;
}

#next-btn {
    margin-top: 15px;
    padding: 10px 15px;
    border: none;
    background: #333;
    color: white;
    border-radius: 5px;
    cursor: pointer;
}