/* SET BASIC VALUES AND ASIGN THEM TO A VAR */
:root {
    --text-color-dark: rgb(31, 31, 31);
    --navbar-height: 80px;
    --navbar-bg: rgb(31, 31, 31);    
    --navbar-hover-color: rgb(51, 145, 145);
    --text-color-light: #fff8e6;
    --side_margin: 150px;
    --hover-color: rgb(183, 234, 189);
    --border-link: rgb(134, 192, 134);
}


/* STANDART FORMATING */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    text-decoration: none;
}

a{
    font-style: none;

}



h1{
    font-family: 'Bebas Neue';
}


body {
    margin: 0;
    padding: 0;
    height: 100%;

    background-image: url("images/background.jpg");
    background-size: 100%;
    background-attachment: fixed;
}

html {
    height: 100%;
    scroll-behavior: smooth;
}

a {
    text-decoration: none;
}

li {
    list-style: none;
}

p{
    line-height: 160%;
}

/* HR */
.hr_gray{
    width: 30vw;
    height: 1.5px;

    background-color: rgb(31, 31, 31);

    border: none;
}

.flex_div {
    display: flex;

    width: 100%;
}


/* NO MARGIN */




/* HEADER WITH LOGO AND NAVBAR */

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--navbar-bg);
    padding: 0px 2% 0px 3%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 1000;
}

header .logo {
    width: 400px;
}

/* PARENT_UL IS VISIBLE NAVBAR IN HEADER */
header .parent_ul {
    list-style: none;
}

header .parent_ul li {
    width: 225px;

    position: relative;
    float: left;

    text-align: center;
}

#li_about{
    width: 100px;
}

header .parent_ul li a {
    font-style: none;
    font-size: 17px;
    padding: 25px;
    color: rgb(255, 255, 255);
    display: block;
}

header .parent_ul a:hover {
    background: var(--hover-color);
    color: var(--navbar-bg);
}



/* DROPDOWN NAV */

header .dropdown_ul {
    position: absolute;
    left: 0;
    display: none;
    width: fit-content;
    background: rgb(88, 88, 88);
    list-style: none;
}

header .dropdown_ul li {
    width: 100%;
    border-top: 1px solid rgb(31, 31, 31);
}

header .dropdown_ul li:hover {
    background: gray;
    width: 100%;
}

/* DROPDOWN APPEARS WHEN HOVER OVER LI */

header .parent_ul li:focus-within>ul,
header .parent_ul li:hover>ul {
    display: inherit;
}

#menu-bar {
    display: none;
}

header label {
    font-size: 20px;
    color: rgb(255, 255, 255);
    cursor: pointer;
    display: none;
}

/* RESPONSIVE ELEMENT */

@media(max-width:1800px) {

    header {
        padding: 20px;
    }

    header label {
        display: initial;
    }

    header .navbar {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: rgb(31, 31, 31);
        border-top: 3px solid rgb(31, 31, 31);
        display: none;
    }

    header .parent_ul li {
        width: 100%;
    }

    #li_about{
        width: 100%;
    }

    header .dropdown_ul {
        position: relative;
        width: 100%;
    }

    header .dropdown_ul li {
        background: rgb(109, 109, 109);

    }

    #menu-bar:checked~.navbar {
        display: initial;
    }

}



/* ABOUT FOOTER DARK*/

#flex_about{
    width: 100%;
    height: fit-content;
    
    background-color: var(--navbar-bg);
    align-items:flex-start;

    padding-bottom: 50px;


}

.div_about_left{
    width: 40vw;

    margin: 50px 0 0 18vw;
}


.div_about_right{
    width: 30vw;

    margin: 50px 0 0 0;
    
}

#hl_invis{
    opacity: 0;
    font-size: 40px;
}



.subheadline_about{
    color: #ffffff;
    font-size: 25px;
    margin: 20px 0 20px 0;

    font-family: 'Bebas Neue'
}


.headline_about{
    color: #ffffff;
    font-size: 40px;
    margin: 0;

    font-family: 'Bebas Neue'
}


.text_white{
    color: white;
    text-align: justify;
    font-size: 15px;

    width: 30vw;

    line-height: 200%;
}

/* FOOTER ABOUT LIGHT */
#flex_about_light{
    width: 100%;
    height: fit-content;
    
    background-image: url(images/yellow_texture.jpg);
    align-items:flex-start;

    padding-bottom: 50px;


}

#hl_invis{
    opacity: 0;
    font-size: 40px;
}

.subheadline_about_light{
    color: var(--navbar-bg);
    font-size: 25px;
    margin: 20px 0 20px 0;

    font-family: 'Bebas Neue'
}


.headline_about_light{
    color: var(--navbar-bg);
    font-size: 40px;
    margin: 0;

    font-family: 'Bebas Neue'
}


.text_dark {
    text-align: justify;
    font-size: 15px;

    width: 30vw;

    line-height: 200%;
}


/* LITERATURE */


.lit_small_content{
    width: 40vw;

    padding: 50px 100px 10px 100px;

    margin: 0 30vw 0 30vw;

    background-color: rgb(31, 31, 31);

    color: rgb(255, 255, 255);
}


.headline_lit{
    font-size: 50px;

    color: rgb(255, 255, 255);

    margin: none;
    padding: none;

}

.hr_lit{
    height: 1px;

    background-color: rgb(255, 255, 255);

    border: none;

    margin: none;
    padding: none;


}

.text_lit a{
    font-size: 17px;
    color: rgb(217, 255, 255);
}






/* HEADLINE */
.headline_index {
    width: 100%;


    font-family: 'Bebas Neue';
    position: absolute;
    
    margin-top: 15vw;
    font-size: 10vw;
    color: var(--navbar-bg);
    text-shadow: 3px 3px 6px rgb(255, 255, 255);

    text-align: center;
    
    padding: none;
}

.headline_div {
    height: auto;

    font-family: 'Bebas Neue';

    text-align: center;

    position: relative;

    background: url(images/blue_texture.jpg);
}

.headline_image_index {
    position: relative;
    width: 100vw;
    height: 40vw;

    margin-top: 50px;
    background-size: cover;
    background-position: center;

    text-align: center;
}


.hr_index{
    position: absolute;
    width: 60vw;
    height: 2.5px;
    margin-left: 20vw;

    background-color: rgb(31, 31, 31);

    border: none;

}

.text_intro{
    width: 100%;

    text-align: center;

    padding: 100px 20vw 0 20vw;

}

.text_intro p{
    background-color: #f0f0f0;

    padding: 30px;
}

/* BODY */


#systemrisiken_überschrift_box {
    margin: 1=00px;


}

#systemrisiken_überschrift {
    text-align: center;
    font-size: 3vw;

    margin: 100px 0;
}

.container {
    position: relative;
    height: 700px;
    width: 100%;

}

.container_round {
    position: relative;
    height: 50vw;
    width: 100%;

    margin-bottom: 200px;

}

.round_image {
    width: 20vw;
    height: 20vw;

    border-radius: 600px;


}

.round_text_box {
    display: flex;
    justify-content: center;
    align-items: center;
}

.text {
    text-align: center;

    font-size: 1vw;

    margin: 5vw;
}

.headline_round{
    font-size: 3vw;
}

p {
    text-align: justify;
}

#title {
    text-align: center;
    font-size: 100px;
    margin-bottom: 20px;
}

#intro {
    text-align: justify;
    margin: 0px 400px 0px 400px;
    padding: 30px;
    border-radius: 10px;
    font-size: 22px;
}


/* SYSTEMRISIKEN - WAS IST DAS? */

#arrow_start {
    position: absolute;
    height: 20vw;
    width: 20vw;
    margin-left: 57vw;
    top: 0px;
}


#systemrisiken_box {
    width: 40vw;
    height: 40vw;
    background: url(images/azure_texture.jpg);
    background-size: 1000px;
    margin-left: 15vw;
    border-radius: 600px;
    margin-top: 50px;
}

#systemrisiken_text {
    width: 30vw;
}



/* KLIMAWANDEL */


#klimawandel_image {
    position: absolute;
    right: 50vw;
    margin-top: 50px;
}

#klimawandel_box {
    position: absolute;
    width: 50vw;
    height: 50vw;
    background: url(images/yellow_texture.jpg);
    background-size: 1000px;

    right: var(--side_margin);
    margin-top: 100px;

    border-radius: 600px;
}

#klimawandel_text {
    width: 500px;

    padding: 30px;
}




/* PANDEMIEN */

#pandemien_image {
    position: absolute;
    left: 50vw;
    margin-top: 50px;
}

#pandemien_box {
    position: absolute;
    width: 50vw;
    height: 50vw;
    background: url(images/purple_texture2.jpg);
    background-size: 1000px;

    margin-left: var(--side_margin);
    margin-top: 100px;

    border-radius: 600px;
}

#pandemien_text {
    width: 550px;

    padding: 30px;
}



/* KÜNSTLICHE INTELLIGENZ */

#ki_image {
    position: absolute;
    right: 55vw;
    margin-top: 30px;
}

#ki_box {
    position: absolute;
    width: 55vw;
    height: 55vw;
    background: url(images/blue_texture.jpg);
    background-size: 1500px;
    right: var(--side_margin);
    margin-top: 100px;
    border-radius: 1000px;
}

#ki_text {
    width: 600px;

    padding: 30px;
}



/* KRIEG */

#krieg_image {
    position: absolute;
    left: 55vw;
    margin-top: 60px;
}

#krieg_box {
    position: absolute;
    width: 55vw;
    height: 55vw;
    background: url(images/red_texture.jpg);
    background-size: 1500px;
    margin-top: 100px;
    margin-left: var(--side_margin);
    border-radius: 1000px;
}

#krieg_text {
    width: 550px;
    padding: 30px;
}



/* WIRTSCHAFTSKRISE */

#wk_image {
    position: absolute;
    right: 55vw;
    margin-top: 150px;
}

#wk_box {
    position: absolute;
    width: 55vw;
    height: 55vw;
    background: url(images/green_texture.jpg);
    background-size: 1400px;
    right: var(--side_margin);
    margin-top: 200px;
    margin-bottom: 100px;
    border-radius: 600px;
}

#wk_text {
    width: 550px;

    padding: 30px;
}





/* CONTENT PAGES */
/* HEADLINE AND HEADLINE IMAGE */

.headline_intro {
    width: 100vw;

    font-family: 'Bebas Neue';
    position: absolute;
    
    font-size: 10vw;
    color: var(--navbar-bg);
    text-shadow: 3px 3px 6px rgb(255, 255, 255);

    text-align: center;
}

.headline_div {
    height: auto;
    display: flex;
    font-family: 'Bebas Neue';

    text-align: center;



}

.headline_image {
    position: relative;
    width: 100vw;
    height: 80vh;

    margin-top: 50px;

    background-size: cover;
    background-position: center;

    text-align: center;



}


.hr_intro{
    width: 60vw;
    height: 2.5px;
    margin-left: 20vw;

    background-color: rgb(31, 31, 31);

    border: none;

}