:root {
    --angle: 3deg;
    --width: 100vw;
    --tan: 0.052408;
    /* tan(5deg) */
    --image-ratio: calc(1686/4819);
    --skew-padding: calc(var(--width) * var(--tan));
}

html {
    scroll-behavior: smooth;
}


.horizontal-seperator {
    height: 2px;
    width: 100%;
    background-color: black;
}

.dummy {
    width: 100%;
    height: 15vh;
}

.menu {
    font-size: 14px;
}

.sub-menu {
    font-size: smaller;
    margin-left: 3%;
}


body {
    background-color: #460f08;
    margin-left: 20%;
}

.header {
    background-size: 100% 100%;
    background-repeat: no-repeat;
    text-align: center;
    height: calc(var(--image-ratio)*0.8*100vw);
    padding-top: 3%;
    color: white;
    background-image: url("../images/pano_organ.jpg");
    padding-bottom: var(--skew-padding);
}

.header h1 {
    font-size: calc(0.02*100vw);
    margin: auto;
    width: 80%;
    border-radius: 20px;
    background-color: #00000058;
}

.image-slide {
    width: 50%;
    aspect-ratio: 1;
    float: right;
    padding: 1vw;
    display: flex;
}

.image-slide .main-image {
    position: relative;
    max-width: 100%;
    max-height: 100%;
    margin: auto;
    border-radius: 0.8vw;
}

.right-image {
    border-radius: 1vw;
    width: 50%;
    margin: 20px;
    float: right;
}

#content {
    position: relative;
    top: calc(-1/2*var(--skew-padding));
}

#sidenav {
    height: 100vh;
    width: 20%;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #682B2B;
    overflow-x: hidden;
    padding-top: 20px;
}

.mail-form {
    margin-left: 20%;
    width: 60%;
}

.mail-form-inner {
    width: 100%;
    margin: 1%;
}

#program_viewer {
    margin-left: 10%;
    width: 80%;
    aspect-ratio: 1 / 1.42;
}

.logo {
    width: 50%;
    margin-left: 25%;
}

.left50 {
    width: 45%;
}

.right50 {
    width: 45%;
    margin-left: 9%;
}

.dropdown {
    position: absolute;
    width: 18%;
    right: 2vw;
    top: 1vw;
    z-index: 100;
}

.lang-form {
    display: inline;
}

.bt-lang {
    background: transparent;
    border: none;
    width: 45%;
}

.lang-img {
    margin: 20%;
    width: 60%;
}

.lang-img:hover {
    transform: scale(1.5);
    transition: 0.5s;
}

#sidenav a {
    color: white;
    text-decoration: none;
    display: block;
    padding: 0.5em;
}

#sidenav a:hover,
#sidenav a.hover {
    background-color: #00000077;
    transition: all 0.4s;
}

#sidenav a#home {
    font-size: 1.08em;
    font-weight: bold;
}


#menu-button {
    background-color: #ffffff88;
    position: fixed;
    z-index: 1;
    top: 2%;
    left: 0%;
    width: 6%;
    height: var(0.07*--width);
    border-radius: 1vw;
    margin-left: 1vw;
    visibility: hidden;
}

#program_download {
    visibility: hidden;
    height: 0;
}

.plakat {
    width: 60%;
    float: right;
    padding: 3%;
}


.diagonal-div {
    padding-top: var(--skew-padding);
    padding-bottom: var(--skew-padding);
    background-image: linear-gradient(30deg, #460f08, #27100c);
    transform: skewY(calc(-1*var(--angle)));
    color: white;
}

.diagonal-div .skew-container {
    transform: skewY(var(--angle));
    max-width: 54%;
    margin: auto;
    position: relative;
}



/* On screens that are less than 700px wide, make the sidebar invisible */
@media screen and (max-width: 700px) {
    #sidenav {
        visibility: hidden;
        top: 0;
        left: 0;
        width: 70%;
        padding-top: 20%;
        color: #460f0859;
    }

    .header h1 {
        visibility: hidden;
    }

    body {
        margin-left: 0;
    }

    #menu-button {
        visibility: visible;
    }

    .diagonal-div .skew-container {
        transform: skewY(var(--angle));
        max-width: 90%;
        margin: auto;
        position: relative;
    }

    .mail-form {
        margin-left: 10%;
        width: 80%;
    }

    .image-slide {
        width: 100%;
        aspect-ratio: 1;
        padding: 2vw;
        display: flex;
    }
    
    .image-slide .main-image {
        position: relative;
        max-width: 100%;
        max-height: 100%;
        margin: auto;
        border-radius: 0.8vw;
    }

    #program_viewer {
        visibility: hidden;
        height: 0;
    }

    #program_download {
        visibility: visible;
    }

    
    .left50 {
        width: 70%;
        margin-left: 15%;
        padding-bottom: 5%;
    }

    .right50 {
        width: 70%;
        margin-left: 15%;
    }
}