/* CSS that adds the bare minimum for a simple layout.
 * Nothing here exists purely for aesthetics except the unstyled-list;
 * everything else addresses a specific a11y, compatibility, or critical
 * usability need.
 * I also don't use any classes besides "unstyled-list" and "pix". My
 * HTML contains microformats2 classnames for IndieWeb parsers, but I
 * don't actually use those for styling.
 *
 * I cite WCAG 2.2 success criterions with "SC". */

html {
	/* Mobile screens benefit from greater line-spacing so links are
	 * further apart. Dyslexic users prefer the spacing too.
	 * Necessary to meet SC 1.4.8.
	 * <100dpi screens: sans-serif is better. Why did browsers settle
	 * on serif being the default?? */
	font: 100%/1.5 sans-serif;
}

/* This should not take effect on printouts, to save paper. */
@media screen {
	body {
		/* Default font sizes are one-size-fits-all; they're optimized for a
		 * wide variety of complex pages. For single-column websites like
		 * mine, it's ideal to bump it up ever so slightly. This also makes
		 * <sup>, <sub>, <small>, etc. large enough to have decent contrast
		 * with minimal adjustment, and makes tap-targets larger.
		 * Only do this on screen, since printouts already improve legibility
		 * and cost paper + ink. */
		font-size: 110%;

		/* Aligning to the center with space on both sides prevents accidental
		* link activation on tablets, and is a common practice that users are
		* more used to. */
		margin: auto;

		/* WCAG recommends a max line width. Not everyone can resize the
		 * viewport. This isn't for large blocks of text yet, so we don't have
		 * to go by SC 1.4.8.
		 * 45em = lowest acceptable width for titles, nav, footers, etc */
		max-width: 45em;
		padding: 0 3%;
	}

	/* 45em is too wide for long body text.
	 * Typically meets SC 1.4.8, plus or minus a few characters. */
	div[itemprop="articleBody"] {
		margin: auto;
		max-width: 36em;
	}

	/* Compensate for misalignment and wasted space caused by a padding
	 * increase. */
	nav:not([role="doc-toc"]) {
		margin: -.5em 0 -.5em -.25em;
	}

	/* SC 2.5.5: Increase nav link tap target size a bit */
	nav:not([role="doc-toc"]) a {
		padding: .75em .25em;
	}

	nav li {
		margin-bottom: .75em;
		margin-top: .75em;
	}
}

/* Save some space and paper by making the site nav and footer
 * links single-line, but bump up the line-height to increase
 * space between tap-targets (a11y) */
header li,
footer li {
	display: inline-block;
	margin-right: .75em;
	line-height: 1.75
}



/* narrow screens: reduce margin for blockquotes a lot, using
 * a thick left-side border instead. */
blockquote {
	border-left: 4px solid;
	margin: 0;
	padding-left: .8em;
}

/* narrow screens: reduce list indentation, hyphenate nested lists
 * touch screens: lists of links should be
 * easy to tap so give them some spacing. */
dd,
ol,
ul {
	padding-left: 1.5em;
}

dd {
	margin: 0;
}

ol ol,
ul ul {
	hyphens: auto;
	padding-left: 1em;
}

/* Narrow screens: allow hyphenating titles
 * I can't add soft hyphens to these. */
h1 {
	hyphens: auto;
}

/* Very narrow screens: full hyphenation */
@media (max-width: 12em) {
	article,
	h2,
	h3 {
		hyphens: auto;
	}
}

/* Lists without bullets: navlinks, posts lists, webmentions.
 * Those three are lists whose items are already easily
 * distinguishable, rendering bullet points as unnecessary extra
 * visual noise. Pretty much the only purely-aesthetic change in this
 * CSS file. */
.unstyled-list {
	padding: 0;
}

.unstyled-list li {
	list-style-type: none;
}


/* <kbd> should be distinguished from <code> and surrounding text
 * in a way beyond font-face; at least two visual distinctions needed
 * Also, Small text is easier to read when slightly bolder.
 * This is important in the dark theme where I set my own colors and
 * try to maintain good perceptual contrast even for small text, but
 * I don't want toggling the theme to impact anything besides color so
 * I set the weight here. */
kbd,
sup {
	font-weight: bold;
}

/* narrow screens: remove unused figure margins
 * figure captions shouldn't look like regular paragraphs; there should
 * be some extra space. */
figure {
	margin: 1.5em 0;
}

/* figcaptions should be distinct from surrounding paragraphs tho */
figure:not([itemtype]) figcaption {
	margin: 0 10%;
}

/* browsers make monospace small and unreadable for some dumb legacy
 * reason and this somehow fixes that without overriding the user's
 * font size preferences. */
code,
kbd,
samp {
	font-family: monospace, monospace;
}

/* Narrow screens: long words can cause content to flow out of the
 * viewport, triggering horizontal scrolling. Allow breaking words in
 * content I don't control (comments, names). For content I do control,
 * I just add soft hyphens to the HTML. */
li[itemprop="comment"],
:not(pre) > code,
:not(pre) > samp,
span[itemtype="https://schema.org/Person"] {
	overflow-wrap: break-word;
}

/* Narrow screens: allow horizontal scroll in a pre block. */
pre {
	padding: .5em;
	overflow: auto;
}

/* Distinguish images from the background in case their color is
 * too similar to the page background color. Also put a border around
 * <pre> and <code> to distinguish them in ways besides font-family. The
 * use of borders in place of background colors for distinguishing
 * elements is an officially documented WCAG technique. */
img,
pre,
:not(pre) > code,
:not(pre) > samp {
	border: 1px solid;
}

/* A black border is too harsh. */
:not(pre) > code,
:not(pre) > samp {
	border-color: #999;

	/* borders shouldn't touch text */
	padding: 0 0.1em;
}

/* Some images look blurry when scaled; this makes them easier to
 * read. */
.pix {
	image-rendering: pixelated;
}

/* center images that aren't my indieweb icon; same justification as
 * for centering the body contents. Also makes images easier to see
 * for people holding a device with one hand. */
img:not(.u-photo) {
	display: block;
	height: auto;
	margin: auto;
	max-width: 95%;
}

/* WCAG Technique C25: use borders to separate sections.
 * Also use "content-visibility: auto" to improve performance by
 * reducing the number of DOM nodes rendered at once. */
footer,
section[aria-labelledby="webmentions"],
div[role="doc-endnotes"] {
	border-top: 2px solid;
	content-visibility: auto;
}

/* Some browser focus indicators are inaccessible; override them with
 * something more visible. See WCAG 2.x SC 2.4.12. I also tried to
 * match browser behavior; mainstream browsers use :focus-visible
 * instead of focus but older/simpler browsers only support :focus.
 * I borrowed these directives from
 * https://www.tempertemper.net/blog/refining-focus-styles-with-focus-visible
 * */

/* For browsers that don't support :focus-visible */
a:focus,
summary:focus,
pre[tabindex]:focus {
	outline: 3px solid;
}

/* Remove :focus styling for browsers that do support :focus-visible */
@supports selector(:focus-visible) {
	a:focus:not(:focus-visible),
	summary:focus:not(:focus-visible),
	pre[tabindex]:focus:not(:focus-visible) {
		outline: none;
	}
}

/* Add focus styling back in browsers that do support :focus-visible */
:focus-visible {
	outline: 3px solid;
}

/* Todo:
 * - Some browsers don't scale SVGs properly; the img container
 *   dimensions crop the image rather than scale it. Investigate
 *   if this only applies to Internet Explorer or if it applies to
 *   other uncommon browsers too. If any non-IE browsers do this and/or
 *   if the spec allows this behavior, try to correct it here.
 * - Wait till Webkit fixes its broken-ass default dark stylesheet
 *   then consider trimming the dark stylesheet I provide.
 * */