/* HTML formatting */
html {
    font-family: "Liberation Sans", sans-serif;
    margin: 0 10px;
    line-height: 1.3
}

@media (prefers-color-scheme: dark) {
    body {  
        background: black;
        color: white;
    }
    a { text-decoration: none; 
        color: yellow;
    }
}
  
@media (prefers-color-scheme: light) {
    body {
        background: white;
        color: black;
    }
    a { text-decoration: none; 
        color: blue;
    }
}

a:hover, a:focus { text-decoration: underline dotted; }
a:focus { outline: thin dotted; }

dt { margin-top: 0.5ex; }
dt::after { content: ":"; }

h2, h3 {
    margin-top: 30px;
    margin-bottom: 5px;
    border-top: 1px solid lightgray;
    padding-top: 15px;
    clear: both;
}

table {
    max-width: 100%;
    border-collapse: collapse;
}
th, td { padding: 3px 10px; }

.shadow { box-shadow: 8px 8px 10px #aaa; }
#language-menu .flag-icon {
    margin-right: 0.5ex;
    margin-left: 0.8ex;
}

/* Print format */
@media print {
    @page { margin: 2cm; }

    html {
        font-family: "Liberation Serif", serif;
        font-size: 12pt;
        background: white;
        color: black;
        margin: 0; padding: 0;
    }
    a, blockquote, table, pre, img,
    aside.sticky, aside.sticky::before {
        page-break-inside: avoid;
    }
    aside.sticky::before { page-break-after: avoid; }
    ul, ol, dl, aside.sticky { page-break-before: avoid; }

    h1 { margin: 10vh 0 20vh; }
    h2, h3, h4, h5, h6 {
        page-break-after: avoid;
        page-break-inside: avoid;
        border: none;
        padding: 0;
        margin: 1em 0 0.5em;
    }

    a { color: black; text-decoration: underline dotted; }
    a[href^=http]:after, a[href^=ftp]:after {
        content: " [" attr(href) "]";
        font-size: small;
    }
    a[href^="#"]:after { content: ""; }

    nav, #back-to-top, form#donate { display: none; }
}

/* Back to top button */
#back-to-top:hover { text-decoration: none; }
#back-to-top {
    position: fixed;
    bottom: 0;
    right: 0;
    text-decoration: none;
    color: black;
    padding: 1em;
    z-index: 100;
}

/* PayPal donation form */
form#donate { float: right; }

/* table of contents */
nav#toc { font-size: small; }
nav#toc ol {
    list-style-type: none;
    counter-reset: tocitem;
    padding: 0;
}
nav#toc ol > li {
    display: table;
    counter-increment: tocitem;
}
nav#toc ol > li .icon {
    width: 1em;
    float: left;
    color: black;
    transform: scale(1.3);
}
nav#toc ol > li:before {
    content: counters(tocitem, ".") ". ";
    display: table-cell;
    padding-right: 0.3em;
}
nav#toc ol ol { margin-left: 1em; }
nav#toc li ol > li:before { content: counters(tocitem, ".") ". "; }

/* h2 and h3 auto-numbering */
body { counter-reset: section; }
h2 { counter-reset: subsection; }
h2::before {
    counter-increment: section;
    content: counter(section) ". ";
}
h3::before {
   counter-increment: subsection;
   content: counter(section) "." counter(subsection) ". ";
}

/* key / menu sequences */
kbd.menu,
kbd.key,
kbd>samp,
kbd>kbd {
    -moz-border-radius: 3px;
    -moz-box-shadow: 0 1px 0 rgba(0,0,0,0.2),0 0 0 2px white inset;
    -webkit-border-radius: 3px;
    -webkit-box-shadow: 0 1px 0 rgba(0,0,0,0.2),0 0 0 2px white inset;
    background-color: #f7f7f7;
    border: 1px solid #ccc;
    border-radius: 3px;
    box-shadow: 0 1px 0 rgba(0,0,0,0.2),0 0 0 2px white inset;
    color: black;
    display: inline-block;
    font-family: "Liberation Sans", sans-serif;
    font-size: 0.75em;
    line-height: 1.4;
    margin: 0 .1em;
    padding: .1em .6em;
    text-shadow: 0 1px 0 white;
}

/* currency formatting */
.negative { color:#CC0033; }
.right { text-align: right; }

/* sticky notes for tips and notes */
:root {
    --rotation-angle: -6deg;
}

aside.sticky {
    display: block;
    position: relative;
    top: -5px;
    float: right;
    width: 12em;
    height: auto;
    padding: 1em;
    margin: 0.5em;
    border: 1px solid lightgray;
    text-decoration: none;
    font-size: small;
    color: black;
    /* Firefox */
    -moz-box-shadow:5px 5px 7px rgba(33,33,33,1);
    /* Safari+Chrome */
    -webkit-box-shadow: 5px 5px 7px rgba(33,33,33,.7);
    /* Opera */
    box-shadow: 5px 5px 7px rgba(33,33,33,.7);
    transform: rotate(var(--rotation-angle));
    -ms-transform: rotate(var(--rotation-angle));
    -webkit-transform: rotate(var(--rotation-angle));
    -o-transform: rotate(var(--rotation-angle));
    -moz-transform: rotate(var(--rotation-angle));
}

aside.sticky::before {
    font-weight: bold;
    display: block;
    margin-bottom: 0.5ex;
}

.notes { background:#FFDCB1; }
.notes::before {
    content: 'Note';
    color: #A64425;
}

.tips { background:#97D9B7; }
.tips::before {
    content: 'Tip';
    color: #053C5D;
}
