div
{
    -webkit-tap-highlight-color:rgba(0,0,0,0);
}

body{
    font-size: 16px;
    overflow: hidden;
    font-family: "Arial", Menlo,Monaco,Consolas,"Andale Mono","lucida console","Courier New",monospace;
}

/* Menampilkan layar peringatan jika HP dalam posisi berdiri (Portrait) */
@media screen and (orientation: portrait) {
    body::before {
        content: "📱 Mohon putar perangkat Anda ke posisi mendatar (Landscape), lalu muat ulang (refresh) halaman ini untuk memulai media pembelajaran.";
        position: absolute;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background-color: #222;
        color: #fff;
        z-index: 999999;
        display: flex;
        align-items: center;
        justify-content: center;
        text-align: center;
        font-size: 18px;
        padding: 40px;
        box-sizing: border-box;
        line-height: 1.5;
    }
    
    #mainDiv, .loadDiv {
        display: none !important;
    }
}