/* MAIN */
:root {
    --background-color: #202020;
    --background-image: url(/images/background-640.jpg);
    --background: var(--background-image) var(--background-color);
    --text-color: rgba(255, 255, 255, 0.75);
    --link-color: rgb(26, 172, 196);
    --link-hover-color: rgb(80, 230, 255);
    --footer-text-color: rgba(255, 255, 255, 0.5);
    --header-separator-highlight-color: rgba(255, 255, 255, 0.15);
    --header-separator-shadow-color: rgba(0, 0, 0, 0.75);
    --logo-shadow-color: rgba(0,0,0,.5);
    --header-link-color: rgba(255, 255, 255, 0.75);
    --header-link-hover-color: rgba(255, 255, 255, 1);
    --item-background-color: #101010;
    --item-hover-background-color: #b33e3e;
    --item-text-background-color: rgba(0, 0, 0, 0.6);
    --1unit: 8px;
    --2unit: 16px;
    --3unit: 24px;
    --4unit: 32px;
}

html, body {
    margin: 0;
    padding: 0;
}

html {
    font-family: 'Quicksand', sans-serif;
    font-weight: 400;
    font-size: 16px;
}

body {
    position: relative;
    display: flow-root;
    min-height: 100vh;
    background: var(--background);
    background-size: 100%;
    background-position: top;
    color: var(--text-color);
}

a, a:visited {
    text-decoration:none;
    color: var(--link-color);
    font-weight: 600;
}

a:hover, a:active {
    color: var(--link-hover-color);
}

/* LAYOUT */
.body-wrapper {
    display: flex;
    min-height: 100vh;
    flex-direction: column;
}

.container {
    box-sizing: border-box;
    width: 100%;
    max-width: 1200px;
    padding: 0 var(--1unit);
    margin: 0 auto;
    text-align: center;
}

.column {
    display: inline-block;
    vertical-align: top;
    white-space: normal;
    width: 100%;
    box-sizing: border-box;
    padding: 0 var(--1unit);
    text-align: left;
}

/* HEADER */
.header {
    position: -webkit-sticky;
    position: sticky;
    left: 0;
    right: 0;
    top: 0;
    z-index: 10;
    height: 40px;
    padding: var(--2unit) var(--1unit) 1.25em var(--1unit);
    margin-bottom: var(--3unit);
    opacity: .95;
    background: var(--background);
    background-size: 100%;
    background-position: top;
}

.header::before, .links {
    right: var(--1unit);
    left: var(--1unit);
}

.header::before {
    content: '';
    position: absolute;
    height: 1px;
    bottom: -1px;
    background-color: var(--header-separator-highlight-color);
    border-top: 1px solid var(--header-separator-shadow-color);
}

.logo {
    box-sizing: border-box;
    display: block;
    padding: 0 var(--1unit);
    margin: 0 auto;
    max-width: 100%;
    max-height: 100%;
    filter: drop-shadow(0px 0px 3px var(--logo-shadow-color));
}

.links {
    position: absolute;
    bottom: -1em;
    display: flex;
    justify-content: flex-end;
    margin-bottom: 1px;
}

.link img {
    width: 20px;
    height: 20px;
    vertical-align: text-top;
    opacity: .75;
    transition: opacity .3s ease-in-out;
}

.link {
    position: relative;
    display: inline-block;
    height: 1.75em;
    line-height: 1.75;
    z-index: 5;
    padding: 0 .5em;
    margin: 0 1em;
    background-color: var(--background-color);
    background-clip: padding-box;
    border-top: 1px solid var(--header-separator-shadow-color);
    border-bottom: 1px solid var(--header-separator-highlight-color);
    color: var(--header-link-color);
    transition: color .3s ease-in-out;
}

.link-left {
    margin-right: auto;
}

.link::before, .link::after {
    content: '';
    position: absolute;
    top: -1px;
    width: 1.25em;
    height: 1.25em;
    display: block;
    transform-origin: top left;
    transform: rotateY(45deg) rotateZ(45deg);
    z-index: -1;
    background-clip: padding-box;
    background: var(--background);
}

.link::before {
    left: 0;
    border-left: 1px solid var(--header-separator-shadow-color);
    border-bottom: 1px solid var(--header-separator-highlight-color);
}

.link::after {
    left: 100%;
    border-top: 1px solid var(--header-separator-shadow-color);
    border-right: 1px solid var(--header-separator-highlight-color);
}

.link:hover {
    color: var(--header-link-hover-color);
}

.link:hover img {
    opacity: 1;
}

/* FOOTER */

.footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    color: var(--footer-text-color);
    padding: 1rem;
    text-align: right;
}

.footer-space{
    height: 3rem;
}

/* ITEM */

.item {
    position: relative;
    left: 0;
    top: 0;
    display: block;
    box-sizing: border-box;
    background-color: var(--item-background-color);
    box-shadow: 0 0 3px 0 #000;
    width: 100%;
    margin-bottom: var(--2unit);
    overflow: hidden;
    font-size: 1em;
    transition: background-color 0.1s ease-in-out;
}

.item-image {
    display: block;
    width: 100%;
    padding-bottom: 55.55%;
}

.item-image img {
    width: 100%;
    position: absolute;
    opacity: 1;
    transition: opacity 0.1s ease-in-out, transform .65s ease;
    text-align: center;
    font-size: 3em;
    color: #FFF;
}

.item::after {
    content: '';
    position: absolute;
    z-index: 2;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    transition: box-shadow 0.1s ease-in-out;
    box-shadow: inset 0 0 2px 0 var(--item-background-color);
}

.item-text {
    display: flex;
    position: relative;
    z-index: 1;
    font-size: 1em;
    background-color: var(--item-background-color);
    color: var(--text-color);
    padding: var(--1unit) var(--2unit);
    transition: background-color 0.1s ease-in-out, box-shadow 0.1s ease-in-out;
    box-shadow: 0 0 2px 0 var(--item-background-color);
}

.item-text > span {
    display: inline-block;
    margin: 0 auto;
}

.item:hover {
    background-color: var(--item-hover-background-color);
}

.item:hover .item-text {
    background-color: var(--item-hover-background-color);
    box-shadow: 0 0 2px 1px var(--item-hover-background-color);
    color: #FFF;
}

.item:hover .item-image img {
    transform: scale(1.05);
    opacity: .85;
}

.item:hover::after {
    box-shadow: inset 0 0 2px 1px var(--item-hover-background-color);
}

/* RESPONSIVE */
@media screen and (min-width: 640px){
    .column-10 { width: 10%; }
    .column-20 { width: 20%; }
    .column-30 { width: 30%; }
    .column-40 { width: 40%; }
    .column-50 { width: 50%; }
    .column-60 { width: 60%; }
    .column-70 { width: 70%; }
    .column-80 { width: 80%; }
    .column-90 { width: 90%; }

    .column-50 .item-text,
    .column-60 .item-text,
    .column-70 .item-text,
    .column-80 .item-text,
    .column-90 .item-text,
    .column-100 .item-text {
        position: absolute;
        left: 0;
        right: 0;
        bottom: 0;
        padding: var(--2unit) var(--4unit);
        background-color: var(--item-text-background-color);
        box-shadow: none;
        opacity: 0;
        transition: opacity 0.1s ease-in-out;
    }

    .column-60 .item:hover .item-text,
    .column-70 .item:hover .item-text,
    .column-80 .item:hover .item-text,
    .column-90 .item:hover .item-text,
    .column-100 .item:hover .item-text {
        background-color: var(--item-text-background-color);
        box-shadow: none;
        opacity: 1;
    }
}

@media screen and (min-width: 1200px) {
    .header::before, .links {
        right: calc(var(--1unit) + 15vw - 180px);
        left: calc(var(--1unit) + 15vw - 180px);
    }
}

/* BACKGROUND QUERIES */
@media screen and (min-width: 800px) {
    :root {
        --background-image: url(/images/background-960.jpg);
    }
}
@media screen and (min-width: 1120px) {
    :root {
        --background-image: url(/images/background-1280.jpg);
    }
}
@media screen and (min-width: 1600px) {
    :root {
        --background-image: url(/images/background-1920.jpg);
    }
}

@media (prefers-reduced-motion) {
    .item:hover .item-image img {
        transform: none;
    }
}