.sre-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:20px;
    margin:20px 0;
}

.sre-card{
    border:1px solid #ddd;
    border-radius:10px;
    padding:20px;
    text-align:center;
    background:#fff;
}

.sre-card h3{
    margin:10px 0;
}

.sre-reward{
    font-size:22px;
    font-weight:bold;
}

.sre-start-btn{
    display:inline-block;
    margin-top:15px;
    padding:10px 20px;
    text-decoration:none;
    border:1px solid #333;
}

.sre-ad{
    text-align:center;
    padding:30px;
}

.sre-timer{
    font-size:48px;
    font-weight:bold;
    margin-top:20px;
}

.sre-survey{
    padding:20px;
}

.sre-complete{
    display:inline-block;
    margin-top:20px;
    padding:12px 20px;
}

.sre-success{
    text-align:center;
    padding:50px;
}

@media(max-width:768px){

    .sre-grid{
        grid-template-columns:repeat(2,1fr);
    }

}