:root{   /* set variable */
    --nav-width: 18rem;
    --tall-vertical-spacing: 0.5rem;
    --dim-color: #CCC;
}

body {
    margin: 0; /* default margin adds white gap left of side menu */
    font-family: "Lato", sans-serif;
}

/* left-side navigation pane */
nav {
    height: 100%;
    width: var(--nav-width);
    position: fixed;
      top: 0;
      left: 0;
    z-index: 1;
    background-color: #111;
    overflow: auto;
    padding-top: 1.0rem;
}

nav h3 {
    text-align: center;
    color: var(--dim-color);
}

nav a {
    text-decoration: none;
    font-size: 1.0rem;
    color: white;
    display: block;
}

nav a.current {
    background: #CC0;
    color: black;
}

nav a:hover {
    background: yellow;
    color: black;
}

nav ul {                  /* first level of nav menu */
    padding-left: 0.5rem;
    list-style: none;     /* remove bullets */
}
nav ul ul {               /* second level */
    padding-left: 1.5rem; /* indent */
}
nav li {
    padding-top: var(--tall-vertical-spacing);
    font-size: 1.0rem;
    color: var(--dim-color); /* dim non-link items */
}

/* content */
h1.title { text-align: center; }

div.content, #content, #postamble { /* org-publish inserts <div id="content"> */
    margin-left: var(--nav-width); /* content right of nav */
    font-size: 1.0rem;
    padding-right: 0.5rem;
    padding-left: 0.5rem;
}

.img-margin { margin-left: 20px; }

/* menu_button is three horizontal bars */
div.bar {
    width: 2.5rem;
    height: 0.4rem;
    background-color: black;
    margin-bottom: 0.5rem;
}

div.dropdown div.menu_button {
    display: none; /* remove menu_button */
    margin-right: 1rem;
    float: right;
}

/* narrow screen */
@media screen and (max-width: 70rem) { /* remember to also set max-width in nav.js */
    div.dropdown div.menu_button {
        display: inline-block; } /* display menu_button */
    nav {
        display: none;      /* initial remove nav menu from page until nav.js file is loaded */
        position: absolute; /* position relative to menu_button */
          top: 4rem;
        padding-top: 0;
        height: auto;
        width: 100%; }
    div.content, #content, #postamble {margin-left: 0; } /* move content to left (where nav was) */
}

/* short screen */
/* update max-height to fit narrow-screen nav menu */
@media screen and (max-height: 74.5rem) {
    nav {
        padding-top: 0;
    }
    nav li {
        padding-top: 0.2rem;  /* short vertical spacing */
    }
}