* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: #f5f7fa;
    color: #333;
    margin: 0;
    padding: 0;
    height: 100vh;
}

.container {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    position: relative;
}

header, footer {
    display: none;
}

main {
    width: 100%;
    height: 100%;
}

.app-frame {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

@media (max-width: 768px) {
    .container {
        padding: 0;
    }
    
    .app-frame {
        height: 100%;
        width: 100%;
        transform: scale(1);
        transform-origin: 0 0;
    }
}