/* Reset.css (public domain) https://meyerweb.com/eric/tools/css/reset/  */
a,abbr,acronym,address,applet,article,aside,audio,b,big,blockquote,body,canvas,caption,center,cite,code,dd,del,details,dfn,div,dl,dt,em,embed,fieldset,figcaption,figure,footer,form,h1,h2,h3,h4,h5,h6,header,hgroup,html,i,iframe,img,ins,kbd,label,legend,li,mark,menu,nav,object,ol,output,p,pre,q,ruby,s,samp,section,small,span,strike,strong,sub,summary,sup,table,tbody,td,tfoot,th,thead,time,tr,tt,u,ul,var,video{margin:0;padding:0;border:0;font:inherit;vertical-align:baseline}article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:after,blockquote:before,q:after,q:before{content:'';content:none}table{border-collapse:collapse;border-spacing:0}

/* int10h (CC BY-SA 4.0) https://int10h.org/oldschool-pc-fonts/fontlist/ */
@font-face {
    font-family: 'IBM VGA 8x16';
    src: url('ibm-vga8.woff') format('woff');
    font-weight: normal;
    font-style: normal;
}

:root {
    --text-max-width: 1000px;
    --background-colour: #000084;
    --text-colour: #bbbbbb;
    --text-span-colour: #ffffff;
    --link-colour: #b1f543;
    --link-hover-colour: #00aaaa;
    --font-size: 24px;
    --header-one-colour: #000000;
    --header-one-background: #00aaaa;
    --header-two-colour: #e160dc;
    --header-three-colour: #ffd166;
    --header-four-colour: #ef476f;
    --header-five-colour: #f5cce8;
    --menu-text-colour: #000000;
    --menu-background-colour: #bbbbbb;
    --footer-text-colour: #000000;
    --footer-background-colour: #bbbbbb;
}

html {
    background-color: var(--background-colour);
}

body {
    margin: auto;
    color: var(--text-colour);
    font-family: 'IBM VGA 8x16', monospace;
    font-size: var(--font-size);
}

h1, h2, h3, h4, h5, h6 {
    text-transform: uppercase;
}

h1 {
    color: var(--header-one-colour);
    background: var(--header-one-background);
    padding-top: var(--font-size);
    padding-bottom: var(--font-size);
    padding-left: var(--font-size);
    margin-bottom: var(--font-size);
}
h1::before{ content: "> "; }

h2 { color: var(--header-two-colour); }
h2 span { color: var(--header-three-colour); }
h2::before { content: ">> "; }

h3 { color: var(--header-three-colour); }
h3::before { content: ">>> "; }

h4 { color: var(--header-four-colour); }
h4::before { content: ">>>> "; }

h5 { color: var(--header-five-colour); }
h5::before { content: ">>>>> "; }

h2, h3, h4, h5, h6 {
    margin-top: var(--font-size);
}

p + p {
    padding-top: var(--font-size);
}

p span {
    color: var(--text-span-colour);
}

a {
    text-decoration: none;
    color: var(--link-colour);
}

a:hover {
    background-color: var(--link-hover-colour);
}

main {
    padding-left: var(--font-size);
    padding-right: var(--font-size);
    max-width: var(--text-max-width);
}

nav ul {
    margin-bottom: var(--font-size);
    overflow: hidden;
    background-color: var(--menu-background-colour);
    list-style-type: none;
    padding-left: 0px;
}

nav li {
    float: left;
}

@media only screen and (max-width: 650px) {
    nav li {
        float: none;
    }
}

nav li a {
    text-transform: uppercase;
    display: block;
    color: var(--menu-text-colour);
    /* margin-right: 5px; */
    padding-left: var(--font-size);
    padding-right: var(--font-size);
}

nav li a:hover {
    background-color: var(--menu-text-colour);
    color: var(--menu-background-colour);
}

nav .active {
    background-color: var(--menu-text-colour);
    color: white;
}

ul, ol {
    display: block;
    padding-left: 40px;
}

ul {
    list-style-type: square;
}

ol {
    list-style-type: decimal;
}

pre {
    margin-top: var(--font-size);
    margin-bottom: var(--font-size);
    margin-left: var(--font-size);
    margin-right: var(--font-size);
    padding-top: var(--font-size);
    padding-bottom: var(--font-size);
    padding-left: var(--font-size);
    padding-right: var(--font-size);
    overflow-x: scroll;
    background: #1a1a1a;
    color: #66ff66;
}

code {
    background: #1a1a1a;
    color: #66ff66;
}

table {
    border-collapse: collapse;
    width: 100%;
}
  
td, th {
    border: 1px solid #dddddd;
    text-align: left;
    padding: 8px;
}
  
tr:nth-child(even) {
    background-color: #0f0f0f;
}

img {
    padding: var(--font-size);
    display:block;
    margin:auto;
    width: 80%;
    height: auto;
}

footer {
    color: var(--footer-text-colour);
    background: var(--footer-background-colour);
    margin-top: var(--font-size);
    padding-left: var(--font-size);
    padding-right: var(--font-size);
}

footer a {
    color: var(--footer-text-colour);
}