* {
    -webkit-box-sizing: border-box;
            box-sizing: border-box;
}

:root {
    color-scheme: light dark;
    --light: #fff;
    --lesslight: #efefef;
    --dark: #404040;
    --moredark: #000;
    --link: royalblue;
    border-top: 5px solid var(--dark);
    line-height: 1.5em;
    font-family: system-ui, sans-serif;
    font-size: 16px;
    color: var(--dark);
}

h1 {
    line-height: 1em;
}

button, input, textarea {
    font-size: 1em; /* Override browser default font shrinking*/
}

input {
    border: 1px solid var(--dark);
    background-color: var(--lesslight);
    border-radius: .25em;
    padding: .5em;
}

pre {
    background-color: var(--lesslight);
    margin: 0.5em 0 0.5em 0;
    padding: 0.5em;
    overflow: auto;
}

code {
    background-color: var(--lesslight);
}

blockquote {
    border-left: 0.25rem solid var(--dark);
    padding-left: 1rem;
}

body {
    background-color: var(--light);
    margin: 0;
    max-width: 800px;
    padding: 0 20px 20px 20px;
    margin-left: auto;
    margin-right: auto;
}

a {
    outline: none;
    color: var(--dark);
}

a:hover {
    text-decoration-color: var(--link);
}

img {
    max-width: 100%;
    height: auto;
}

button, .button, input[type=submit] {
    display: inline-block;
    background-color: var(--dark);
    color: var(--light);
    text-align: center;
    padding: .5em;
    border-radius: .25em;
    text-decoration: none;
    border: none;
    cursor: pointer;
}

.button a {
    text-decoration: none;
}

button:hover, .button:hover, input[type=submit]:hover {
    color: var(--lesslight);
    background-color: var(--moredark);
}

/* Add a margin between side-by-side buttons */
button + button, .button + .button, input[type=submit] + input[type=submit] {
    margin-left: 1em;
}

.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.breathe {
    margin-top: 3em;
}

input.center {
    display: block;
    margin-top: 1em;
}

.bordered {
    border: 3px solid;
}

.home {
    display: inline-block;
    background-color: var(--dark);
    color: var(--light);
    margin-top: 20px;
    padding: 5px 10px 5px 10px;
    text-decoration: none;
    font-weight: bold;
}


/* Desktop sizes */
@media (min-width: 600px) {
    ol.twocol {
        -webkit-column-count: 2;
           -moz-column-count: 2;
                column-count: 2;
    }
    
    .row {
        display: flex;
        flex-direction: row;
        padding: 0;
        width: 100%;
    }

    /* Make everything in a row a column */
    .row > * {
        display: block;
        flex: 1 1 auto;
        max-width: 100%;
        width: 100%;
    }

    .row > *:not(:last-child) {
        margin-right: 10px;
    }
}

/* Dark mode overrides (confusingly inverse) */
@media (prefers-color-scheme: dark) {
    :root {
        --light: #222;
        --lesslight: #333;
        --dark: #eee;
        --moredark: #fefefe;
    }
    /* This fixes an odd blue then white shadow on FF in dark mode */
    *:focus {
        outline: var(--light);
        -webkit-box-shadow: 0 0 0 .25em var(--link);
                box-shadow: 0 0 0 .25em var(--link);
    }
    .button a {
        color: var(--light);
    }
}

/* Printing */
@media print {
    .home {
        display: none;
    }
}