/*---------------------------------------------*/
/*SKELETON*/
/*the position, size, and orientation of all elements without style or spaces*/
body, body * {
	display: flex;
	/*by default all elements are verticals*/
	flex-direction: column;
}
html {
	scroll-behavior: smooth;
	/*default font-size for rem*/
	font-size: var(--base-font-size);
}
body {
	background-color: var(--color-back-base);
}
body nav {
	flex-direction: row;
	/*we have to set the height to use the height % for childs elements*/
	height: var(--nav-height);
	background-color: var(--color-back-base);
	z-index: 10;
}
body .container_main {
	flex-direction: row;
	/*the page is designed for a maximum screen*/
	max-width: var(--max-screen);
}
body aside.page_content {
	top: calc(var(--nav-height) + 1px);
	height: calc(100vh - var(--nav-height) - 1px);
	background-color: var(--color-back-base);
}
body main {
	background-color: var(--color-back-base);
}
body aside.relative_content {
	background-color: var(--color-back-base);
}
body footer.page_footer {
	background-color: var(--color-back-dark);
}


/*---------------------------------------------*/
/*DESIGN KEYWORDS*/
/* contains elements oriented vertically (default) or horizontally*/
.vertical {
	flex-direction: column;
}
/* horizontal is only in web version, it becomes vertical in mobile design*/
.horizontal {
	flex-direction: row;
}
/* self position of elements to the left, the right, or the center of their container*/
.right {
	margin-right: 0px;
	margin-left: auto;
	text-align: right;
}
.left > * {
	margin-left: 0px;
}
.center {
	margin-right: auto;
	margin-left: auto;
	text-align: center;
}
.sticky {
	position: -webkit-sticky; /*safari*/
	position: sticky;
	top: 0;
}