:root {
    --greyBack: #212121; 
    --mainBack: #333333;

    --greyLighter: #4d4d4d;

    --black-35: rgba(0, 0, 0, 0.35);

    --orange: #e99423;
    --text: #e6e6e6;

    --font-thin: 100;
    --font-extra-light: 200;
    --font-light: 300;
    --font-regular: 400;
    --font-medium: 500;
    --font-semi-bold: 600;
    --font-bold: 700;
    --font-extra-bold: 800;
    --font-black: 900;

    --imprint-email1: "awi";
    --imprint-email2: "de";
    --imprint-email3: "fz-juelich";
}

@font-face {
    /* https://github.com/nteract/assets/tree/master/fonts/source-sans-pro */
    font-family: 'Source Sans Pro';
    src: url('../fonts/source-sans-pro/SourceSans3VF-Upright.ttf.woff2') format('woff2'),
         url('../fonts/source-sans-pro/SourceSans3VF-Upright.ttf.woff') format('woff');
    font-weight: 100 900;
    font-style: normal;
    font-display: swap;
}
  
@font-face {
    /* https://github.com/nteract/assets/tree/master/fonts/source-sans-pro */
    font-family: 'Source Sans Pro';
    src: url('../fonts/source-sans-pro/SourceSans3VF-Italic.ttf.woff2') format('woff2'),
         url('../fonts/source-sans-pro/SourceSans3VF-Italic.ttf.woff') format('woff');
    font-weight: 100 900;
    font-style: italic;
    font-display: swap;
}

html,
body {
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
    font-family: 'Source Sans Pro', 'Quire Sans Pro', 'Aptops', 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    background-color: var(--greyBack); 
    background-image: url('../pics/background-globe.png');
    background-position-x: center;
    background-repeat: no-repeat;    
    color: var(--text); /* ... */

    max-width: 100%;
    overflow-x: hidden;
}

article {
    display: grid;
    grid-template-rows: auto auto auto;
    grid-template-columns: 1fr;
    grid-template-areas:
        "header"
        "main"
        "footer";
}

.imprint-email-part1::after {
    content: "\0040" var(--imprint-email1);
}
.imprint-email-part2::before {
    content: ".";
}
.imprint-email-part2::after {
    content: var(--imprint-email2);
}
.imprint-email-part3::after {
    content: "\0040" var(--imprint-email3);
}

/* ### 
   Grids: header, footer, main - with own subgrids 
   ### */

/* Subgrid: header */
header {
    grid-area: header;
    display: grid;
    z-index: 100;
    overflow: hidden;
    grid-template-rows: auto;
    grid-template-columns: 1fr;
    grid-template-areas:
        "header-main"
        "header-divider";
}

#header-main {    
    grid-area: header-main;
    display: grid;
    width: 1100px;
    min-height: 100px;
    margin-left: auto;
    margin-right: auto;
    align-items: center;
    grid-template-rows: 1fr;
    grid-template-columns: auto auto;
    grid-template-areas:
        "nav-logo nav-main";
}

#nav-logo {
    grid-area: nav-logo;
    justify-self: left;
    background-color: var(--grey333);
}
#nav-main {
    grid-area: nav-main;
    justify-self: right;
    background-color: var(--grey333);
}

#header-divider {    
    grid-area: header-divider;
    
}
#header-divider, #footer-divider {
    width: 100%;
    height: 5px;
    background-color: var(--orange);
}

/* Subgrid: footer */
footer {
    grid-area: footer;
    display: grid;
    z-index: 100;
    
    grid-template-rows: auto;
    grid-template-columns: 1fr;
    grid-template-areas:
        "footer-divider"
        "footer-main";
}
#footer-main {
    grid-area: footer-main;
    width: 1100px;
    text-align: center;
    justify-self: center;
    background-color: var(--greyBack);
}
#footer-divider {
    grid-area: footer-divider;
    
}

/* Subgrid: main */
main {
    grid-area: main;
    z-index: 50;
    background-color: var(--mainBack);
    width: 1100px;
    justify-self: center;
    box-shadow: 0px 0 2rem 0 black;
}

main #full {
    padding: 0;
}

main #content {
    padding-left: 2rem;
    padding-right: 2rem;
    margin-bottom: 2rem;
}


/* Navigation */
header #nav-main ul {
    list-style-type: none;
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 0;
    padding: 0;
    font-size: 1.75rem;
    font-weight: var(--font-bold);
}
header #nav-main li {
    display: inline-block;
}
header #nav-main a {
    text-decoration: none;
    display: block;
    padding: 8px 15px; 
    transition: background-color 0.3s, color 0.3s;
    color: var(--text);
    border-radius: 0.5rem;
}
header #nav-main a.active, footer #footer-main a.active {
    background-color: black;
    box-shadow: 0px 0px 6px 3px var(--black-35);
}
header #nav-main a:hover, footer #footer-main a.hover {
    background-color: var(--mainBack);
    color: var(--orange);
}

/* footer navigation */
footer nav ul {
    list-style-type: none; 
    margin: 0; 
    padding: 1.75rem 0;
    display: flex;
    justify-content: center; 
    gap: 20px;
    font-size: 1.5rem;
    font-weight: var(--font-bold);
}
footer nav li {
    display: inline-block;
}
footer nav a {
    text-decoration: none;
    display: block;
    padding: 8px 12px; 
    transition: background-color 0.3s, color 0.3s;
    color: var(--text);
    border-radius: 0.5rem;
}
footer nav a:hover {
    background-color: var(--mainBack);
    color: var(--orange);
}

/* sub navigation (project) */
#nav-sub {
    margin-top: 2rem;
}
#nav-sub ul {
    list-style-type: none;
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 0;
    padding: 0;
    font-size: 1.5rem;
    font-weight: var(--font-semi-bold);
}
#nav-sub li {
    display: inline-block;
}
#nav-sub a {
    text-decoration: none;
    display: block;
    padding: 6px 10px; 
    transition: background-color 0.3s, color 0.3s;
    color: var(--text);
    border-radius: 0.5rem;
    background-color: var(--greyBack);
}
#nav-sub a.active{
    background-color: black;
    box-shadow: 0px 0px 6px 3px var(--black-35);
}
#nav-sub a:hover {
    background-color: black;
    color: var(--orange);
    position: relative;
    bottom: 0.1rem;
}

#nav-sub hr {
    margin: 1rem 10% 2rem 10%;
    border-top: 3px solid var(--text);
}


/* headings and text */
p {
    font-size: 1.2rem;
    margin: 0.75rem 0;
}
h1, h2, h3, h4 {
    font-weight: var(--font-bold);
    margin: 2rem 0 0 0;
}
h1 {
    font-size: 1.75rem; 
}
h2 {
    font-size: 1.5rem; 
}
h3 {
    font-size: 1.25rem; 
}
footer h2, h3 {    
    font-style: italic;
    margin: 0 0 0.5rem 0;
}
footer h2 {
    font-weight: var(--font-bold);
    font-size: 1.5rem;    
}
footer h3 {
    font-weight: var(--font-medium);
    font-size: 1.5rem;
}

.larger {
    font-size: 1.5rem;
    font-weight: var(--font-semi-bold);
}

a {
    color: var(--orange);
    font-weight: var(--font-semi-bold);
    text-decoration: underline;
    text-decoration-color: transparent;
    transition: text-decoration-color ease-out 0.25s;
}
a:hover {
    text-decoration-color: var(--orange);
}

.cite {
    /*    
    margin: 2rem 0;
    border-radius: 1rem;
    border-radius: 1rem;*/
    border-left: 3px solid var(--orange);
    margin: 2rem;
    border-bottom-right-radius: 1rem;
    border-top-right-radius: 1rem; 
    padding: 1rem 1.5rem;
    font-size: 1.3rem;
    font-style: italic;
    background-color: var(--black-35);
    
    box-shadow: 0.1rem 0.1rem 0.5rem black;
}
video {
    width: 100%;
    height: auto;
    border-radius: 1rem;
    cursor: pointer;
}
video:hover {
    box-shadow: 0.1rem 0.1rem 0.5rem black;
    transition: transform 0.3s ease-out, box-shadow 0.3s ease-out;
}

ul.publication {
    list-style-type: square;
    padding-left: 0;
    margin-left: 2rem;
}
ul.publication li {
    font-size: 1.15rem;
}

/* other elements */
#logo-bar img {
    margin: 2.25rem 0 2.75rem 0;
    opacity: 0.85;
    transition: opacity 0.3s;
}
#logo-bar img:hover {
    opacity: 1;
}

#nav-logo {
    background-image: url('../pics/logo-top.png');
    height: 65px;
    width: 370px;
    transition: scale 0.5s ease-out, rotate ease-out 0.5s;
}
#nav-logo:hover {
    scale: 1.035;
    rotate: -2.5deg;
}

#nav-logo h1 {
    margin: 0;
    padding-left: 5.15rem;
    padding-top: 0.85rem;
    font-weight: var(--font-extra-bold);
    font-size: 1.8rem;     
}

main hr {
    border-top: 3px solid var(--orange);
    border-radius: 3px;
    margin: 3rem 10%;
}

/* boxes */

.box-group {
    display: flex;
    gap: 2rem;
    margin: 2rem 0;
    flex-wrap: nowrap; 
}


.box-group.boxes-6 {
    gap: 1.5rem;
}
.box-group.boxes-2 .box, .box-group.boxes-3 .box, .box-group.boxes-6 .box {
    flex: 1;
}
.box-group.boxes-3 .box, .box-group.boxes-6 .box {
    text-align: center;
}
.box-group .box h2, .box-group .box h2 {
    margin: 0 ;
}
.box-group .box p, .box-group .box p {
    margin: 0.5rem 0 0  0;
}

.box {     
    display: flex;       
    flex-direction: column;
    box-sizing: border-box; 
    justify-content: end;
    min-height: 100%;    
}
.box.justify-start {
    justify-content: start;
}
.box, .person, .person-detail {
    padding: 1rem;
    border: 3px solid var(--greyLighter);
    border-radius: 0.75rem;
    background-color: var(--greyBack);
    box-shadow: 0.1rem 0.1rem 0.5rem var(--greyBack);
    transition: background-color 0.5s ease-out, border-color 0.5s ease-out;
}
.box:hover, .person:hover, .person-detail:hover {
    background-color: var(--mainBack);
    border-color: var(--orange);
    transform: translateX(0);
}
.box img {
    margin: 0 auto 1rem auto;    
}
.box.no-box {
    border: none;
    background-color: transparent;
    box-shadow: none;
    transition: none;
    padding: 0.25rem;
}
.box.no-box p {
    text-align: left;
}
figure {
    margin: 1.5rem;;
    padding: 0;
}
figure img {
    width: 100%;
    max-width: 1000px;
    height: auto;
    border-radius: 0.75rem;
    box-shadow: 0.1rem 0.1rem 0.5rem black;
}
figcaption {
    font-size: 1.2rem;
    font-weight: var(--font-medium);
    margin: 0.25rem 0 0 0;
    font-style: italic;
}
.portraits {
    display: grid;
    grid-template-columns: repeat(auto-fill, calc(150px + 2rem + 6px));
    gap: 1rem;
    margin: 1.5rem 0;
    justify-content: center;
}
.portraits figure {
    margin: 0;
}
.portraits figure img {
    margin-bottom: 0;
}
.portraits figcaption {
    text-align: center;
}
.person {
    width: calc(150px + 2rem + 6px); 
    box-sizing: border-box;
    cursor: pointer;
}
.person-detail p {
    margin:  0;
}
.person-detail.active {
    display: inline-block;
    opacity: 1;
    filter: blur(0);    
}
.person-detail.inactive {
    display: none;
    opacity: 0;
}
.person.locked {
    border-color: var(--orange);
    border-width: 4px;
}

.copynote {
    font-size: 0.80rem;
    text-align: right;
}
.copynote.aftercite {
    margin-right: 2rem;
    margin-bottom: 1.5rem;
}

.partner-logo {
    float: right;
    margin: 0.25rem 0 0.5rem 1.5rem;    
    mix-blend-mode: overlay;
}
.partner-logo img {
    border-radius: 0.75rem;
}
.partner-logo:hover {
    mix-blend-mode: soft-light;
}

.full-width {
    width: 100%;
    height: auto;
    display: block;
}

/* effects */
.fade-in {
    opacity: 0;
    transition: opacity 2s ease-out;
    will-change: opacity;
}
.fade-in.visible {
    opacity: 1;
}

.blur-in {
    opacity: 0;
    filter: blur(5px);
    transition: opacity 1s ease-out, filter 1s ease-out;
    will-change: opacity, filter;
}  
.blur-in.visible {
    opacity: 1;
    filter: blur(0);
}
  
.fly-in {
    flex: 1;
    opacity: 0;
    transition: opacity 1s ease-out, transform 1s ease-out;
    will-change: opacity, transform;
}
.fly-in.left {
    transform: translateX(-100px);
}
.fly-in.right {
    transform: translateX(100px); 
}
.fly-in.bottom {
    transform: translateY(100px); 
}
.fly-in.top {
    transform: translateY(-100px); 
}
.fly-in.visible {
    opacity: 1;
    transform: translateX(0); 
}

img.rounded {
    border-radius: 0.5rem;
    box-shadow: 0.1rem 0.1rem 0.5rem black;
}
img.spin {
    animation:spin 30s linear infinite;
}
@keyframes spin { 
    100% { 
        -webkit-transform: rotate(360deg); 
        transform:rotate(360deg); 
    } 
}

/* responsive */
@media (max-width: 1180px) {    
    #header-main, main, #footer-main {
        width: 100%;
    }
    main #full img {
        width: 100%;
        max-width: 100%;
    }
    #nav-logo {
        margin-left: 1rem;
    }
    #nav-main {
        margin-right: 1rem;
    }
    #logo-bar img {
        max-width: 95%;
    }    
}

@media (max-width: 870px) {
    header #nav-main ul {
        gap: 5px;
    }
    header #nav-main a {
        padding: 6px 10px;
    }
}

@media (max-width: 780px) {
    header #nav-main ul {
        font-size: 1.5rem;
    }
    header #nav-main a {
        padding: 4px 8px;
    }
    footer h2, footer h3 {
        font-size: 1.25rem;
    }
    footer nav ul {
        font-size: 1.25rem;
    }
}

@media (max-width: 720px) {
    #header-main {
        grid-template-rows: 1fr;
        grid-template-columns: 1fr;
        grid-template-areas:
            "nav-logo"
            "nav-main";
    }
    #nav-logo {
        margin: 1rem 0 ;
        justify-self: center;
    }
    #nav-main {
        margin: 0 0 1rem 0;
        justify-self: center;
    }
    #nav-sub hr {
        margin: 2rem 0 0.5rem 0;
    }
    #nav-sub ul {
        flex-direction: column;
        text-align: center;
        font-size: 1.25rem;
    }
    figure {
        margin: 0.5rem;
    }

    main #content {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    header #nav-main ul {
        gap: 10px;
    }
    .box-group {
        gap: 1rem;
        margin: 2rem 0;
        flex-wrap: wrap; 
    }
    main hr {
        margin: 2.5rem 10% 2rem 10%;
    }
    main {
        background-color: rgba(51,51,51,0.66);
    }
    .cite {        
        padding: 0.75rem 1.25rem;
        margin: 2rem 0;
    }

}
@media (max-width: 630px) {
    .person-detail.inactive {
        display: inline-block;
        opacity: 1;
        filter: blur(0);    
    }
    .person-detail {
        margin: 1rem 0;
    }
    .person {
        cursor: auto;
    }
    .partner-logo {
        float: none;
        display: flex;
        justify-content: center;
        margin: 0.25rem 0 ;  
        mix-blend-mode: soft-light;     
    }
    .partner-logo:hover {
        mix-blend-mode: normal;
    }
}

@media (max-width: 500px) {
    .box-group {
        flex-direction: column;
    }
}