/* base.css — reset, typography, page layout. Nothing component-specific. */

/* ---------- reset ---------- */

*,
*::before,
*::after {
	box-sizing: border-box;
}

body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ul, ol {
	margin: 0;
	padding: 0;
}

h1, h2, h3, h4 {
	font-size: inherit;
	font-weight: inherit;
}

ul, ol {
	list-style: none;
}

a {
	color: inherit;
	text-decoration: none;
}

img, canvas, svg {
	display: block;
	max-width: 100%;
}

button, input, select, textarea {
	font: inherit;
	color: inherit;
	background: none;
	border: 0;
	border-radius: 0;
}

button {
	cursor: pointer;
}


/* ---------- page ---------- */

html {
	/* tells the browser to theme scrollbars and form controls with the tokens above */
	color-scheme: light dark;
	-webkit-text-size-adjust: 100%;

	/* Keeps the scrollbar's width reserved whether or not one is showing. A
	   page that grows past the viewport otherwise narrows by the scrollbar
	   width the instant it does, and everything on screen jumps sideways. */
	scrollbar-gutter: stable;
}

body {
	background: var(--bg);
	color: var(--text);
	font-family: var(--font-ui);
	font-size: var(--t3);
	font-weight: var(--w-regular);
	line-height: var(--lh-body);
	padding: var(--page-pad);
}


/* ---------- type roles ---------- */

/* every number the user reads or compares: hex, OKLCh values, spread, catalog no. */
.num {
	font-family: var(--font-num);
	font-variant-numeric: tabular-nums;
}

.label {
	font-size: var(--t2);
	line-height: var(--lh-label);
	color: var(--text-muted);
}

.title {
	font-size: var(--t4);
	font-weight: var(--w-medium);
	line-height: var(--lh-label);
}


/* ---------- utilities ---------- */

/* Both of these need !important, and for the same reason: an author rule like
   `.panel { display: flex }` or `main { display: flex }` outranks the browser's
   own [hidden] rule and any later display value, so "hide this" would silently
   lose. Their entire job is to beat a component's display. */
.is-hidden,
[hidden] {
	display: none !important;
}

/* present to screen readers, absent on screen — used for the file input,
   which is triggered by its own <label> styled as a button */
.visually-hidden {
	position: absolute;
	width: 1px;
	height: 1px;
	margin: -1px;
	padding: 0;
	overflow: hidden;
	clip-path: inset(50%);
	white-space: nowrap;
}


/* ---------- quality floor ---------- */

:focus-visible {
	outline: 2px solid var(--text);
	outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
	*,
	*::before,
	*::after {
		animation-duration: 0.01ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.01ms !important;
		scroll-behavior: auto !important;
	}
}