body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 100%);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

#instruction-container, #question-container, #quizOver-container {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.08);
    padding: 32px 40px;
    margin-bottom: 24px;
    max-width: 400px;
    width: 100%;
    display: none;
}

#instruction-container {
    display: block;
    background: #f1f5f9;
    border: 2px solid #6366f1;
    box-shadow: 0 4px 24px rgba(99,102,241,0.08);
    border-radius: 16px;
    padding: 32px 40px;
    margin-bottom: 24px;
    max-width: 400px;
    width: 100%;
}

#instruction-container h3 {
    color: #4f46e5;
    margin-bottom: 12px;
    font-size: 1.3rem;
}

#instruction-container p {
    color: #334155;
    margin: 6px 0;
    font-size: 1.05rem;
}

#question-container h1, #quizOver-container h1 {
    color: #4f46e5;
    margin-bottom: 16px;
}

#marks, #time {
    font-size: 1.1rem;
    margin: 8px 0;
    color: #64748b;
}

#quest {
    font-size: 1.2rem;
    margin: 20px 0 16px 0;
    color: #1e293b;
}

.opt {
    display: block;
    width: 100%;
    margin: 8px 0;
    padding: 12px;
    font-size: 1rem;
    border: none;
    border-radius: 8px;
    background: #e0e7ff;
    color: #3730a3;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}

.opt:hover:enabled {
    background: #6366f1;
    color: #fff;
}

#btn-start {
    display: block;
    margin: 24px auto 0 auto;
    padding: 12px 32px;
    font-size: 1.1rem;
    background: #4f46e5;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(79,70,229,0.08);
    transition: background 0.2s, transform 0.1s;
}

#btn-start:hover {
    background: #3730a3;
    transform: translateY(-2px) scale(1.04);
}

#btn-reset {
    display: block;
    margin: 24px auto 0 auto;
    padding: 12px 32px;
    font-size: 1.1rem;
    background: #22c55e;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(34,197,94,0.08);
    transition: background 0.2s, transform 0.1s;
}

#btn-reset:hover {
    background: #16a34a;
    transform: translateY(-2px) scale(1.04);
}

@media (max-width: 500px) {
    #instruction-container, #question-container, #quizOver-container {
        padding: 20px 8px;
        max-width: 95vw;
    }
    #btn-start {
        width: 100%;
    }
}