*{
box-sizing: border-box;
}

body{
    font-family: "Open Sans", sans-serif;
    background: #222;
    color: #BBB;
    margin: 50px 0 0 0;
}
.body-nested{
    margin: 100px 0 0 0;
}

.anchor{
    padding: 100px 0 0 0;
}

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

.grid{
    display: grid;
    margin: auto 8px;
}

ul{
    padding-left: 20px;
}

ol.content-list{
    padding-left: 28px;
}

img{
    max-width: 100%;
    display: block;
}

.footer{
    display: flex;
    justify-content: space-between;
    align-items: start;
}

a{
    color: #337ab7;
    text-decoration: none;
}
a:hover{
    color: #23527c;
    text-decoration: underline;
}

ul.code{
    list-style: none;
    padding: 0;
}

/* navbar, fixed at top of window */
.navbar{
    position: fixed;
    top: 0px;
    height: 50px;
    width: 100%;
    z-index: 1000;
    background: #333;
    margin: 0;
    padding: 0;
    border-bottom: 1px solid black;
}
.navbar-nested{
    top: 50px;
}

/* menu buttons for navbar */
.menu{
    height: 100%;
}

.menuitem{
    height: 100%;
    padding: 0 8px;
}
a.menuitem{
    color: #BBB;
    text-decoration: none;
}
.menuitem:hover{
    background: #666;
}
.menuitem-active{
    background: #111;
}

/* boxes for content structuring */
.highlight{
    background: #333;
    padding: 6px 12px;
    margin: 6px 0px;
    border-radius: 4px;
}
.highlight-nested{
    background: #222;
}
a.highlight{
    color: #BBB;
    text-decoration: none;
}
.highlight-button:hover{
    background: #666;
}

/* fragmented highlights on gui page */
.gui-text{
    margin: 0px 0px 6px 0px;
    border-radius: 0px 0px 4px 4px;
}

.gui-head{
    margin: 6px 0px 0px 0px;
    border-radius: 4px 4px 0px 0px;
}

.gui-image{
    margin: 0px;
    border-radius: 0px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

@media (min-width: 768px){
    .grid{
        grid-template-columns: min-content 1fr;
    }
    .content-list{
        grid-row: 1 / 4;
        position: sticky;
        width: 250px;
        top: 118px;
    }
    .content-text, .content-image{
        grid-column-start: 2;
    }
}

@media (min-width: 1200px){
    .grid{
        grid-template-columns: minmax(min-content, 1fr) minmax(auto, 960px) minmax(min-content, 1fr);
    }
    .content-image{
        grid-column-start: 3;
        grid-row: auto / span 2;
        align-self: center;
        min-width: 400px;
    }
    .gui-head{
        border-top-right-radius: 0px;
    }
    .gui-text{
        border-bottom-right-radius: 0px;
    }
    .gui-image{
        flex-direction: row;
        align-self: auto;
        justify-self: left;
        margin: 6px 0px;
        border-top-right-radius: 4px;
        border-bottom-right-radius: 4px;
    }
    .gui-image > img{
        max-height: 80%;
    }
}

/* classes for highlighting part of an image */
.overlay-container{
    position: relative;
}
.img-overlay{
    position: absolute;
    border: solid 1px red;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-shadow: black 0px 0px 5px;
}
.img-overlay > *{
    display: none;
}
.img-overlay:hover{
    color: red;
    background: #f001;
    text-decoration: none;
    z-index: 100;
}
.img-overlay:hover > *{
    display: block;
}
