/* variables */
:root {
	--font-size: 12pt;
	--line-height: 1.625;
  --font-family: monospace;

  /* font-derived vertical and horizontal units */
  --v-un: calc(var(--font-size) * var(--line-height));
  --h-un: 1ch;

  /* gaps and paddings */
  --body-padding-h: var(--h-un);
  --body-padding-v: var(--v-un);
  --main-gap-h: calc(2 * var(--h-un));
  --main-gap-v: 0;

  /* font-derived column width */
  --max-col-w: calc(100vw - (2 * var(--body-padding-h)) - var(--main-gap-h) - 1ch);
  --col-w: clamp(32ch, 72ch, var(--max-col-w));

  /* colors */
  --fg-c: #000000;
  --bg-c: #ffffff;
	--link-c: hsl(240 100% 50%);
	--visited-c: hsl(270 100% 50%);
	--active-c: hsl(0 100% 50%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg-c: #ffffff;
    --bg-c: #000000;
    --link-c: hsl(240 100% 75%);
    --visited-c: hsl(270 100% 75%);
    --active-c: hsl(0 100% 75%);
  }
}

/* reset */
* {
	box-sizing: border-box;
  margin: unset;
  hyphens: auto;
}

/* root */
:root {
	color: var(--fg-c);
	background-color: var(--bg-c);
  font: var(--font-size)/var(--line-height) var(--font-family);
}

/* content sectioning */
address {
  font-style: unset;
}

h1, h2, h3, h4, h5, h6 {
	font-size: unset;
  font-weight: bold;
}

article {
  counter-reset: heading;
}

article h1:before {
	content:
    counter(heading)". ";
	counter-increment: heading;
}

article h1 {
	counter-reset: subheading;
}

article h2:before {
	content:
    counter(heading)"."
    counter(subheading)". ";
	counter-increment: subheading;
}

article h2 {
  counter-reset: subsubheading;
}

article h3:before {
  content:
    counter(heading)"."
    counter(subheading)"."
    counter(subsubheading)". ";
  counter-increment: subsubheading;
}

article h3 {
  counter-reset: subsubsubheading;
}

article h4:before {
  content:
    counter(heading)"."
    counter(subheading)"."
    counter(subsubheading)"."
    counter(subsubsubheading)". ";
  counter-increment: subsubsubheading;
}

article h4 {
  counter-reset: subsubsubsubheading;
}

article h5:before {
  content:
    counter(heading)"."
    counter(subheading)"."
    counter(subsubheading)"."
    counter(subsubsubheading)"."
    counter(subsubsubsubheading)". ";
  counter-increment: subsubsubsubheading;
}

article h5 {
  counter-reset: subsubsubsubsubheading;
}

article h6:before {
  content:
    counter(heading)"."
    counter(subheading)"."
    counter(subsubheading)"."
    counter(subsubsubheading)"."
    counter(subsubsubsubheading)"."
    counter(subsubsubsubsubheading)". ";
  counter-increment: subsubsubsubsubheading;
}

/* text content */
:is(blockquote, dl, figure, hr, menu, ol, p, pre, ul) +
:is(blockquote, dl, figure, hr, menu, ol, p, pre, ul) {
  margin-block-start: var(--v-un);
}

blockquote {
	margin-inline: calc(4 * var(--h-un));
}

ol, ul, menu {
  padding-inline-start: calc(4 * var(--h-un));
}

:is(ol, ul, menu) :is(ol, ul, menu) {
  margin-block: unset;
}

ul>li::marker {
	content: "- ";
}

hr {
	color: unset;
	border: unset;
  border-top: var(--fg-c) dotted 0.1pt;
}

/* inline text semantics */
a {
  cursor: pointer;
  text-decoration: underline;
}

a:link {
  color: var(--link-c);
}

a:link:active {
  color: var(--active-c);
}

a:visited {
  color: var(--visited-c);
}

a:visited:active {
  color: var(--active-c);
}

/* layout */
body {
	width: 100vw;
	height: 100vh;
	padding: var(--body-padding-v) var(--body-padding-h);
}

body>main {
	height: 100%;
	display: grid;
	grid-auto-flow: column;
  grid-auto-columns: var(--col-w);
  gap: var(--main-gap-v) var(--main-gap-h);
	overflow-x: scroll;
}

body>main>article {
	overflow-y: scroll;
}

body>main>article>header {
  margin-block-end: var(--v-un);
}

body>main>article>footer {
  margin-block-start: var(--v-un);
}