.smartguide{
    max-width:1100px;
    margin:auto;
    padding:20px;
    line-height:1.8;
}

.smartguide h2{
    margin-bottom:20px;
}

.smartguide h3{
    margin-top:50px;
    padding-left:12px;
    border-left:5px solid #1b2e7c;
}

.smartguide h4{
    margin-top:30px;
    color:#1b2e7c;
}

.movie{
    position:relative;
    width:100%;
    padding-top:56.25%;
    margin:30px 0;
}

.movie iframe{
    position:absolute;
    inset:0;
    width:100%;
    height:100%;
}

.image-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
    gap:15px;
    margin:20px 0;
}

.image-grid img{
    width:100%;
    height:auto;
    border:1px solid #ddd;
    border-radius:8px;
}

.notice li{
    margin-bottom:8px;
}

@media (max-width:768px){

    .smartguide{
        padding:15px;
    }

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

}

@media (max-width:480px){

    .image-grid{
        grid-template-columns:1fr;
    }

}