:root {
	--light-base: #C3CBD6;
	--medium-base: #748B6F;
	--dark-base: #2A403D;
	--highlight: #D05663;
}

* {
    margin: 0;
    padding: 0;
}


body {
	font-family: Avantgarde, TeX Gyre Adventor, URW Gothic L, sans-serif;	
}

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

article {
	min-height: 100%;
	display: grid;
	grid-template-rows: auto 1fr auto;
	grid-template-columns: 100%;
}

/* -------------------- Navbar ----------- */

nav {
	background-color: var(--medium-base);
	padding: 20px;
	padding-top: 25px;
	text-align: center;
	font-size: 20px;
}
nav a {
	color: white;
	text-decoration: none;
}

nav a:hover {
	text-decoration: underline;
	text-underline-position: under;	
}

nav ul {
	list-style-type: none;
}

nav li {
	display: inline;
	margin-right: 25px;
}

nav li:last-child {
	margin-right: 0px;
}

/* ------------------ Footer -------------- */

footer {
	background-color: var(--medium-base);
	padding: 30px;
	padding-bottom: 28px;
	text-align: left;
	font-size: 20px;
}

footer a {
	color: white;
	text-decoration: none;
}

footer a:hover {
	text-decoration: underline;
	text-underline-position: under;
}

footer ul {
	list-style-type: none;
}

footer li {
		margin-bottom: 10px;
}

footer li:last-child {
	margin-bottom: 0px;
}

/* --------------- basic text page --------------- */

.grid-container {
	display: grid;
	grid-template-columns: auto;
}
.grid-item {
	margin: 50px;
	position: relative;
}

.grid-item h1 {
	font-size: 38px;
	margin-bottom: 50px;	
}

.grid-item p {
	font-size: 20px;
	line-height: 2;
	margin-left: 30px;
}

.grid-item ul {
	margin-left: 50px;
	list-style-type: none;
}

.grid-item li {
	
	font-size: 20px;
	line-height: 2;
}

.grid-item a {
	color: black;
	text-decoration: none;
}

.grid-item a:hover {
	text-decoration: underline;
	text-underline-position: under;
}

/* --------------- Gallery ------------ */

.gallery {
	display: grid;
	grid-template-columns: auto auto auto;
	margin: 25px;
}

.gallery-item {
	/*border: 1px solid;*/
	margin: 50px;
	position: relative;
}

.gallery-item img {
	display: block;
	width: 100%;
	height: auto;
	box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
	
	opacity: 1;
  	transition: .5s ease;
  	backface-visibility: hidden;	
}

.gallery-overlay-text {
	background-color: var(--medium-base);
	color: white;
	font-size: 16px;
	text-align: center;
	padding: 16px 32px;	
	
 	transition: .5s ease;
	opacity: 0;
	position: absolute;
   top: 50%;
   left: 50%;
   transform: translate(-50%, -50%);
   -ms-transform: translate(-50%, -50%)
}


.gallery-item:hover img {
  opacity: 0.3;
}


.gallery-item:hover .gallery-overlay-text {
  	opacity: 1;
}

/* --------------- AdventCalendar ------------ */

.adventcalendar {
	display: grid;
	grid-template-columns: auto auto auto auto auto auto;
	margin: 25px;
}

.adventcalendar-item {
	/*border: 1px solid;*/
	margin: 25px;
	position: relative;
}

.adventcalendar-item img {
	display: block;
	width: 100%;
	height: auto;
	box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
	
	opacity: 1;
  	transition: .5s ease;
  	backface-visibility: hidden;
}

.adventcalendar-overlay-image {
	position: absolute;
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
	opacity: 0;
	transition: 0.8s ease;
}

.adventcalendar-item:hover .adventcalendar-overlay-image{
	opacity: 1;
}

@media screen and (max-width: 1400px) {

	.adventcalendar {
		grid-template-columns: auto auto auto auto auto;
	}
}

@media screen and (max-width: 1200px) {

	.adventcalendar {
		grid-template-columns: auto auto auto auto;
	}
}


@media screen and (max-width: 1000px) {
	
	.gallery {
		grid-template-columns: auto auto;	
	}

	.adventcalendar {
		grid-template-columns: auto auto auto;
	}

}


@media screen and (max-width: 650px) {
	.gallery {
		grid-template-columns: auto;	
	}

	.adventcalendar {
		grid-template-columns: auto auto;
	}
}

@media screen and (max-width: 600px) {

	nav li {
		display: block;
		margin-right: 0px;
	margin-bottom: 10px;
	}
}

@media screen and (max-width: 450px) {
	
	nav li:last-child {
		margin-bottom: 0px;
	}

	.adventcalendar {
		grid-template-columns: auto;
	}
}