/* ==== Declare Constants ==== */
:root {
    --clr_background: white;
    --clr_foreground: black;
    --clr_accent1: #8A1515; /* Directory, Subtitle, Heading 1 (burgundy) */
    --clr_accent2: #085170; /* Title, Heading 2 (dark turquoise)*/
    --clr_link: #18577e; /* (blue) */
    --clr_link_visited: #278DCC;
    --clr_link_hover_bg: #D0D0D0; /* (medium-light gray) */
    --clr_code_bg: #C0C0C0; /* (light gray) */
    --gradient_hr: linear-gradient(to right, white, #808080, #808080, white);
    --gradient_bg: linear-gradient(to right, white, #F0F0F0, white, white, #F0F0F0, white 100%)
}

/* === Dark Mode === */
@media (prefers-color-scheme: dark) {
    :root {
        --clr_background: black;
        --clr_foreground: rgb(220, 245, 230);
        --clr_accent1: #b03737; /* Directory, Subtitle, Heading 1 (burgundy) */
        --clr_accent2: #278DCC; /* Title, Heading 2 (Light turquoise)*/
        --clr_link: #278DCC; /* (blue) */
        --clr_link_visited: #336cce;
        --clr_link_hover_bg: #303030;
        --clr_code_fg: #a0a0a0;
        --clr_code_bg: #505050; /* (dark gray) */
            --gradient_bg: linear-gradient(to right, black, #101010, black, black, #101010, black 100%)
    }
}

/* ==== Import Fonts ==== */
@font-face {
    font-family: 'Open Sans';
    font-style: italic;
    font-weight: 300;
    src: local('Open Sans Light Italic'), local('OpenSans-LightItalic'), url(https://fonts.gstatic.com/s/opensans/v15/memnYaGs126MiZpBA-UFUKWyV9hrIqM.woff2) format('woff2');
}

@font-face {
    font-family: 'Open Sans';
    font-style: italic;
    font-weight: 400;
    src: local('Open Sans Italic'), local('OpenSans-Italic'), url(https://fonts.gstatic.com/s/opensans/v15/mem6YaGs126MiZpBA-UFUK0Zdc0.woff2) format('woff2');
}

@font-face {
    font-family: 'Open Sans';
    font-style: italic;
    font-weight: 700;
    src: local('Open Sans Bold Italic'), local('OpenSans-BoldItalic'), url(https://fonts.gstatic.com/s/opensans/v15/memnYaGs126MiZpBA-UFUKWiUNhrIqM.woff2) format('woff2');
}

@font-face {
    font-family: 'Open Sans';
    font-style: normal;
    font-weight: 300;
    src: local('Open Sans Light'), local('OpenSans-Light'), url(https://fonts.gstatic.com/s/opensans/v15/mem5YaGs126MiZpBA-UN_r8OUuhp.woff2) format('woff2');
}

@font-face {
    font-family: 'Open Sans';
    font-style: normal;
    font-weight: 400;
    src: local('Open Sans Regular'), local('OpenSans-Regular'), url(https://fonts.gstatic.com/s/opensans/v15/mem8YaGs126MiZpBA-UFVZ0b.woff2) format('woff2');
}

@font-face {
    font-family: 'Open Sans';
    font-style: normal;
    font-weight: 700;
    src: local('Open Sans Bold'), local('OpenSans-Bold'), url(https://fonts.gstatic.com/s/opensans/v15/mem5YaGs126MiZpBA-UN7rgOUuhp.woff2) format('woff2');
}

@font-face {
    font-family: 'Open Sans';
    font-style: normal;
    font-weight: 800;
    src: local('Open Sans ExtraBold'), local('OpenSans-ExtraBold'), url(https://fonts.gstatic.com/s/opensans/v15/mem5YaGs126MiZpBA-UN8rsOUuhp.woff2) format('woff2');
}

/* ==== CSS Reset ==== */
* {
    box-sizing: border-box;
}

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}

/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
    display: block;
}

/* Images */
img {
    border-style: none;
}

/* ==== Body Defaults ==== */
body {
    margin: 0;
    color: var(--clr_foreground);
    font-family: 'Open Sans', 'Arial', Helvetica, sans-serif;
    font-size: 100%; /* For pages, we allow sensitivity to browser font size settings */
    line-height: 1.4;
    background: var(--gradient_bg);
}
/* All other font sizes should be relative to the base (e.g. 1.5em or 150%) */

/* Main frame for pages - should sit just inside body */
#frame {
    max-width: 55em;
    margin: 5px auto;
    padding: 5px;
}

/* Manage floating layout */
.clearfix::after {
    content: "";
    clear: both;
    display: table;
}

/* ==== Header including site title and main menu ==== */

header {
    margin-bottom: 0.5em;
}
header::after {
    /* Keeps float items from overflowing the block */
    content: "";
    clear: both;
    display: table;
    /* Border rule */
    background-image: var(--gradient_hr);
    height: 2px;
    width: 100%;
    margin-top: 1em;
}

/* siteblock should be a DIV that frames up the sitetitle and sitesubtitle */
div.siteblock {
    float: left;
    margin-bottom: 0.2em;
}
/* Site title or logo */
.siteblock h1 {
    font-family: "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 2.6em;
    letter-spacing: -0.03em;
    font-weight: 300;
    color: black;
    font-style: normal;
    font-variant: normal;
    margin-top: 0;
    margin-bottom: 0;
    line-height: 1;
}
/* Site subtitle or slogan */
.siteblock h2 {
    font-family: "Open Sans", Helvetica, Arial, sans-serif;
    font-size: 1.4em;
    font-weight: 400;
    color: black;
    font-style: normal;
    font-variant: normal;
    margin-top: 0;
    margin-bottom: 0;
    line-height: 1.2;
}

/* Manage Links in the siteblock */
.siteblock a {
    color: inherit;
    text-decoration: inherit;
}
.siteblock a:hover {
    background-color: var(--clr_link_hover_bg);
    color: inherit;
    text-decoration: inherit;
}
.siteblock a:visited {
    color: inherit;
    text-decoration: inherit;
}

/* ==== Main Menu ==== */

/* menu should be a div that frames up the main menu */
nav {
    float: right;
    font-size: 1.2em;
    margin-bottom: 0.2em;
}
nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
nav li {
    color: var(--clr_accent1);
}
nav li a {
    color: inherit;
    text-decoration: inherit;
}
nav li a:hover {
    background-color: var(--clr_link_hover_bg);
    color: inherit;
    text-decoration: inherit;
}
nav li a:visited {
    color: inherit;
    text-decoration: inherit;
}

/* ==== Footer ==== */
footer {
    text-align: center;
}
footer::before {
    /* Border rule */
    content: "";
    display: table;
    background-image: var(--gradient_hr);
    height: 2px;
    width: 100%;
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}
footer::after {
    /* Keep float items from overflowing the block */
    content: "";
    clear: both;
    display: table;
}

/* ==== Main Section - where articles appear */
main {
    /* Nothing here - inherits setup from the frame. */
}

/* ==== General text formatting ==== */

/* Core document/content. Comes after the header and before the footer. */
article {
    /* This particular stylesheet doesn't modify anything in the article space. Placeholder only. */
    /* Other styles may have a background within which the article sits. */
}

p {
    margin-bottom: 1em;
}

ul {
    list-style: disc;
    margin-left: 3em;
    margin-bottom: 1em;
}

ul ul {
    list-style: circle;
}

ol {
    list-style: decimal;
    margin-left: 3em;
    margin-bottom: 1em;
}

em, i {
    font-style: italic;
}

strong, b {
    font-weight: bold;
}

blockquote {
    quotes: none;
    border-left: darkred solid 0.25em;
    margin-left: 2em;
    padding-left: 1em;
    margin-bottom: 1em;
}

q {
    quotes: '“' '”'
}

/* Links */
a {
    text-decoration: underline;
    color: var(--clr_link);
}
a:hover {
    background-color: var(--clr_link_hover_bg);
}
a:visited, .linkvisited {
    color: var(--clr_link_visited);
}

/* Page or document Title */
.title {
    text-align: center;
    font-size: 1.6em;
    font-weight: bold;
    color: var(--clr_accent2);
    margin-top: 0.5em;
    margin-bottom: 0.5em;
    line-height: 1;
}

.subtitle {
    text-align: center;
    font-weight: bold;
    font-size: 1.2em;
    color: var(--clr_accent1);
    margin-top: 0;
    margin-bottom: 0.5em;
    line-height: 1;
}

/* Headings */
h1 {
    font-size: 2.0em;
    font-weight: normal;
    color: var(--clr_accent1);
    margin-top: 0.5em;
    margin-bottom: 0.2em;
}

h2 {
    font-size: 1.5em;
    font-weight: bold;
    color: var(--clr_accent2);
    margin-top: 0.5em;
    margin-bottom: 0.2em;
}

h3 {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--clr_accent2);
    margin-top: 0.2em;
}

h4 {
    font-size: 1.2em;
    font-weight: bold;
    font-style: italic;
    color: var(--clr_foreground);
    margin-top: 0.2em;
}

h5 {
    font-size: 1.1em;
    font-weight: bold;
    text-decoration: underline;
    color: var(--clr_foreground);
    margin-top: 0.2em;
}

h6 {
    font-size: 1.1em;
    font-weight: bold;
    text-decoration: none;
    color: var(--clr_foreground);
    margin-top: 0.2em;
}

h1 a, h2 a, h3 a, h4 a, h5 a, h6 a,
h1 a:link, h2 a:link, h3 a:link, h4 a:link, h5 a:link, h6 a:link,
h1 a:visited, h2 a:visited, h3 a:visited, h4 a:visited, h5 a:visited, h6 h:visited {
    color: inherit;
    text-decoration: inherit;
}

h1 a:hover, h2 a:hover, h3 a:hover, h4 a:hover, h5 a:hover, h5 a:hover, h6 a:hover {
    color: var(--clr_link);
    text-decoration: underline;
}

/* horizontal rule */
hr {
    border: 0;
    height: 2px;
    background-image: var(--gradient_hr);
    width: 100%;
}

/* code blocks */
code {
    font: 0.9em "Lucida Console", Monaco, monospace;
    color: var(--clr_foreground);
    background-color: var(--clr_code_bg);
    padding: 0 3px 0 3px;
}

pre {
    font: 0.9em "Lucida Console", Monaco, monospace;
    color: var(--clr_foreground);
    background-color: var(--clr_code_bg);
    padding: 8px;
    border-width: 1px;
    border-style: ridge;
    border-radius: 5px;
    border-color: black;
    margin-bottom: 1em;
}

pre code {
    font: inherit;
    color: inherit;
    background-color: inherit;
    padding: 0;
}

kbd {
    display: inline-block;
    font-family: "Lucida Console", Monaco, monospace;
    border: black solid 1px;
    border-radius: 0.3em;
    padding: 0 0.2em;
    background-color: #424242;
    color: white; 
}

/* Tables */
table {
    border-collapse: collapse;
    border-spacing: 0;
    margin: 2em 0 1.5em 0;
}

table th {
    font-weight: bold;
    border-top: 0.2em solid var(--clr_foreground);
    border-bottom: 0.2em solid var(--clr_foreground);
    padding: 6px 13px;
    text-align: left;
}

table td {
    border-bottom: 0.1em solid var(--clr_foreground);
    padding: 6px 13px;
}

/* Layout Tables (have no borders, padding, or margins) */
table.layout {
    margin: 0;
}

table.layout th, table.layout td {
    border: 0 none white;
    padding: 0;
}

/* === Special classes for IT210 === */
.question {
    color: darkred;
    font-style: italic;
    margin-bottom: 0.5em;
}

/* === Print === */
@media print {

    body {
        background: white;
    }

    code, pre {
        background-color: var(--clr_code_bg);
    }    
}