body {font-family : 'Noto Sans KR', sans-serif;
        background: #f8faff;
        margin: 0;
        padding: 0;
    }
    #heada {
        margin-top: 50px;
        text-align: center;
        padding: 2rem 0;
    }
    #quiz {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 1.5rem;
        max-width: 900px;
        margin: 0 auto;
        padding: 1rem;
    }
    .card {
        background: #fff;
        padding: 1.5rem;
        border-radius: 15px;
        box-shadow: 0 3px 10px rgba(0,0,0,0.1);
        transition: 0.3s;
    }
    .card:hover {
        transform: translateY(-4px);
        box-shadow: 0 5px 15px rgba(0,0,0,0.15);
    }
    .question {
        font-size: 1.1rem;
        font-weight: 600;
        margin-bottom: 1rem;
    }
    .show-answer,.show-explain {
        background: #0078d4;
        color: white;
        border: none;
        padding: 8px 15px;
        margin-right: 5px;
        border-radius: 8px;
        cursor: pointer;
        transition: 0.3s;
    }
    .show-answer:hover,.show-explain:hover {
        background: #005fa3;
    }
    .answer, .explain {
        display: none;
        margin-top: 10px;
        padding: 10px;
        border-radius: 8px;
        background: #fef4e8;
        color: #b95e00;
        font-size: 0.95rem;
        animation: fadeIn 0.5s ease-in-out;
    }
    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(-5px); }
        to { opacity: 1; transform: translateY(0); }
    }