/* The basics - broadly applicable CSS */
/* box sizing rules */
*, *::before, *::after {
    box-sizing: border-box;
}
/* General */
body {
    margin: 0;
    line-height: 1.4;
    font-size: 1em;
    letter-spacing: normal;
    -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5, h6 {
    margin: 0;
    line-height: 1.5;
    letter-spacing: normal;
}
h1 {
    margin-bottom: .6em;
    text-align: center;
    line-height: 1.7;
    font-size: 3.2em;
    font-weight: bold;
}
h2 {
    margin-bottom: .6em;
    line-height: 1.6;
    font-size: 2.5em;
    font-weight: bold;
}
h3 {
    margin-bottom: .5em;
    font-size: 2.3em;
    font-weight: normal;
}
h4 {
    margin-bottom: .5em;
    font-size: 1.9em;
    font-weight: bold;
}
h5 {
    margin-bottom: .5em;
    font-size: 1.7em;
    font-weight: normal;
}
h6 {
    margin-bottom: .5em;
    font-size: 1.4em;
    font-weight: bold;
}
a {
    text-decoration: underline;
}
/* link style where hovering provides a box for easier visibility */
a:hover, a:focus {
    outline-width: 2px;
    outline-style: solid;
    outline-offset: 1px;
}
p {
    margin: 0;
    margin-bottom: .5em;
}
ul, ol {
    margin: 0;
    margin-bottom: .75em;
}
li {
    margin: 0;
    margin-bottom: .2em;
}
code {
    /* wrap text for readability */
    white-space: pre-wrap;
}
pre {
    margin: 0;
    margin-top: 1em;
    margin-bottom: 2em;
    padding: 1em;
    border: none;
}
img {
    display: block;
    max-width: 100%;
    margin: 1em auto;
    border: none;
}
hr {
    margin: 1.7em 0;
    border: none;
    border-bottom-width: 2px;
    border-bottom-style: solid;
}
main {
    padding: 2em 0;
}
footer {
    padding: 1em .5em;
    border-top-width: 2px;
    border-top-style: solid;
    text-align: center;
    font-size: 1.1em;
    line-height: 1.7;
}
table {
    margin: 1em 0;
}
/* Useful Objects */
/* skip link - every page should have one */
#skip-link {
    position: absolute;
    top: -3em;
    left: 1em;
    transition: top .5s ease;
    padding: .9em .6em;
    text-decoration: underline;
    opacity: 0;
    transition: opacity .5s linear;
}
#skip-link:focus, #skip-link:active {
    top: 1em;
    outline: 0;
    border-width: 2px;
    border-style: solid;
    border-radius: .5em;
    opacity: 1;
}
#skip-link:hover {
    text-decoration: none;
}
/* back to top - requires js to appear once user has scrolled down and disappear when user has scrolled back up */
#back-to-top {
    position: fixed;
    bottom: 1em;
    right: 1em;
    opacity: 0;
    transition: opacity .5s linear;
}
#back-to-top.active /* uses class "active" to indicate when to turn visible */, #back-to-top:focus {
    opacity: 1;
}
/* Utilities */
/* buttons */
.btn {
    display: inline-block;
    padding: .375em .75em;
    border-width: 1px;
    border-style: solid;
    border-radius: .25em;
    text-align: center;
    white-space: nowrap;
    text-decoration: none;
    line-height: 1.7;
}
.btn:hover, .btn:focus {
    outline: none;
    /* make sure color changes clearly indicate when button is hovered over or focused on */
}
a.btn:hover, a.btn:focus {
    /* make it clear when a button is a link */
    text-decoration: underline;
}
.btn.hide {
    display: none;
}

/* one style for blockquotes and "notices" class */
.notices {
    border-width: .1em;
    border-style: solid;
}
blockquote, .notices {
    margin: 1em 0;
    padding: .5em .5em 0 1em;
    border-left-width: 1em;
    border-left-style: solid;
}