global.css

:root {
	--content-max-width: 48rem;
	--breakout-size: 12rem;
  
	--space-xxs: 0.2361rem;
	--space-xs: 0.382rem;
	--space-s: 0.618rem;
	--space-m: 1rem;
	--space-l: 1.618rem;
	--space-xl: 2.6179rem;
	--space-xxl: 4.2358rem;
  
	--font-size-xs: clamp(0.75rem, 0.125vw + 0.725rem, 0.7813rem);
	--font-size-s: clamp(0.875rem, 0.25vw + 0.825rem, 0.9375rem);
	--font-size-m: clamp(1rem, 0.5vw + 0.9rem, 1.125rem);
	--font-size-l: clamp(1.125rem, 0.75vw + 0.975rem, 1.3125rem);
	--font-size-xl: clamp(1.3125rem, 1vw + 1.1125rem, 1.5625rem);
	--font-size-xxl: clamp(1.5rem, 1.5vw + 1.2rem, 1.875rem);
	--font-size-xxxl: clamp(1.75rem, 2vw + 1.35rem, 2.25rem);
  
	--line-height-xs: 1;
	--line-height-s: 1.2;
	--line-height-m: 1.414;
	--line-height-l: 1.618;
  
	--color-white: white;
	--color-black: black;

	--color-gray-10: #f6f7f8;
	--color-gray-20: #ebeef0;
	--color-gray-30: #dee3e5;
	--color-gray-40: #cfd4d8;
	--color-gray-50: #bdc3c7;
	--color-gray-60: #a8adb1;
	--color-gray-70: #8e9295;
	--color-gray-80: #6d6f71;
	--color-gray-90: #404142;

	--color-primary: #325df1;
	--color-primary-hover: #2144ca;
	--color-primary-active: #18338f;
	--color-secondary: var(--color-gray-20);
	--color-secondary-hover: var(--color-gray-30);
	--color-secondary-active: var(--color-gray-40);
	--color-selection: #1ea9ea;
	--color-error: #c83c15;
	--color-error-hover: #a32a07;
	--color-error-active: #792109;
	--color-success: #417f11;
	--color-success-hover: #2e6400;
	--color-success-active: #234905;
  
	--color-input: var(--color-white);
	--color-background: var(--color-gray-10);
	--color-background-alt: var(--color-gray-20);
	--color-border: var(--color-gray-50);
	--color-text: var(--color-black);
	--color-text-soft: var(--color-gray-80);
	--color-text-inverted: var(--color-white);
  
	--font-family-sans: 'Helvetica Neue', Arial, Roboto, sans-serif;
	--font-family-mono: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
  
	--font-weight-regular: 400;
	--font-weight-bold: 700;
  
	--opacity-transparent: 0;
	--opacity-translucent: 0.4;
	--opacity-dimmed: 0.8;
	--opacity-solid: 1;
  
	--transition-short: 0.2s;
	--transition-medium: 0.5s;
	--transition-long: 1.25s;
  
	--easing-linear: linear;
	--easing-in: ease-in;
	--easing-out: ease-out;
	--easing-inout: ease-in-out;

	--input-height: 2rem;
}
  
@media screen and (min-width: 45em) and (max-width: 75em) {
	:root {
		--font-size-xs: clamp(0.7813rem, 0.1042vw + 0.7344rem, 0.8125rem);
		--font-size-s: clamp(0.9375rem, 0.2083vw + 0.8438rem, 1rem);
		--font-size-m: clamp(1.125rem, 0.4167vw + 0.9375rem, 1.25rem);
		--font-size-l: clamp(1.3125rem, 0.8333vw + 0.9375rem, 1.5625rem);
		--font-size-xl: clamp(1.5625rem, 1.4583vw + 0.9063rem, 2rem);
		--font-size-xxl: clamp(1.875rem, 2.0833vw + 0.9375rem, 2.5rem);
		--font-size-xxxl: clamp(2.25rem, 2.9167vw + 0.9375rem, 3.125rem);
	}
}
  
/* @media screen and (min-width: 75em) and (max-width: 125em) {
	:root {
		--font-size-xs: clamp(0.8125rem, 0.0694vw + 0.7604rem, 0.8438rem);
		--font-size-s: clamp(1rem, 0.2778vw + 0.7917rem, 1.125rem);
		--font-size-m: clamp(1.25rem, 0.5556vw + 0.8333rem, 1.5rem);
		--font-size-l: clamp(1.5625rem, 0.9722vw + 0.8333rem, 2rem);
		--font-size-xl: clamp(2rem, 1.8056vw + 0.6458rem, 2.8125rem);
		--font-size-xxl: clamp(2.5rem, 2.7778vw + 0.4167rem, 3.75rem);
		--font-size-xxxl: clamp(3.125rem, 4.1667vw, 5rem);
	}
} */
  
@media (prefers-color-scheme: dark) {
	:root {
		--color-gray-10: #e6e8e8;
		--color-gray-20: #ccd2d2;
		--color-gray-30: #b1bbbc;
		--color-gray-40: #98a4a5;
		--color-gray-50: #7f8c8d;
		--color-gray-60: #677374;
		--color-gray-70: #505959;
		--color-gray-80: #383c3d;
		--color-gray-90: #1c1e1e;
	
		--color-input: var(--color-black);
		--color-background: var(--color-gray-90);
		--color-background-alt: var(--color-gray-80);
		--color-primary: #4f7cfd;
		--color-primary-hover: #779cf9;
		--color-primary-active: #a5bbf1;
		--color-secondary: var(--color-gray-80);
		--color-secondary-hover: var(--color-gray-70);
		--color-secondary-active: var(--color-gray-60);
		--color-error: #e55a32;
		--color-error-hover: #f7805d;
		--color-error-active: #fdab92;
		--color-success: #5d9934;
		--color-success-hover: #80b261;
		--color-success-active: #aaca95;
		--color-text: var(--color-white);
		--color-text-soft: var(--color-gray-20);
		--color-text-inverted: var(--color-black);
	}
}
  
@media (prefers-reduced-transparency) {
	:root {
		--opacity-translucent: 0.7;
		--opacity-dimmed: 0.9;
	}
}

html {
	-webkit-text-size-adjust: 100%;
	-moz-tab-size: 4;
	-o-tab-size: 4;
	tab-size: 4;
	font-family: var(--font-family-sans);
	scroll-padding-top: var(--space-xl);
	scroll-behavior: smooth;
}

input,
textarea,
button,
select,
option,
optgroup {
	font-family: var(--font-family-sans);
}
  
body {
	padding: 0;
	margin: 0;
	line-height: inherit;
	color: var(--color-text);
	background: var(--color-background);
}
  
*:focus-visible {
	outline: none;
	box-shadow: 0 0 var(--space-xxs) 2px var(--color-selection);
}
  
::selection {
	background-color: color-mix(in srgb, var(--color-selection) 50%, transparent);
}
  
h1 {
	font-size: var(--font-size-xxxl);
	line-height: var(--line-height-xs);
}
h2 {
	font-size: var(--font-size-xxl);
	line-height: var(--line-height-s);
}
h3 {
	font-size: var(--font-size-xl);
	line-height: var(--line-height-s);
}
h4 {
	font-size: var(--font-size-l);
	line-height: var(--line-height-m);
}
h5 {
	font-size: var(--font-size-m);
	line-height: var(--line-height-m);
}
h6 {
	font-size: var(--font-size-m);
	line-height: var(--line-height-m);
}
p,
li,
th,
td,
dt,
dd,
pre,
input {
	font-size: var(--font-size-m);
	line-height: var(--line-height-l);
}
small {
	font-size: var(--font-size-s);
	line-height: var(--line-height-m);
}

dl {
	display: grid;
	grid-template-columns: auto 1fr;
	gap: var(--space-s) var(--space-m);
  
	dt {
	  font-weight: var(--font-weight-bold);
	  color: var(--color-text-soft);
	}
  
	dd {
	  margin: 0;
	}
}

.content-grid,
main {
	display: grid;
	grid-template-columns:
		[fullwidth-start] minmax(var(--space-l), 1fr)
		[breakout-start] minmax(0, var(--breakout-size))
		[content-start] min(var(--content-max-width), calc(100% - 2 * var(--space-l)))
		[content-end] minmax(0, var(--breakout-size))
		[breakout-end] minmax(var(--space-l), 1fr)
		[fullwidth-end];

	> .content,
	> section {
		grid-column: content;
	}

	.breakout {
		grid-column: breakout;
	}
}

section {
	margin-block: var(--space-xl);

	&.hero {
		grid-column: fullwidth;
		display: grid;
		grid-template-columns: inherit;
		background-color: var(--color-primary);
		color: var(--color-white);
		margin-block: 0;
		padding-block: var(--space-xxl);

		h1 {
			grid-column: content;
			margin-bottom: var(--space-xl);
		}

		.lead {
			grid-column: content;
			font-size: var(--font-size-l);
		}
	}
  
	h3 {
		margin: var(--space-xl) 0 var(--space-l);
	}
}
  
h1,
h2,
h3,
h4,
h5,
h6,
p,
ol,
ul,
dl,
table,
pre {
	margin: 0 0 var(--space-l);
}

ol,
ul {
	display: flex;
	flex-direction: column;
	gap: var(--space-m);
}

p code,
li code,
dt code,
dd code,
td code {
	background-color: var(--color-background-alt);
	border-radius: var(--space-xxs);
	padding: var(--space-xxs);
	font-family: var(--font-family-mono);
	font-size: calc(0.95 * var(--font-size-m));
}

h1,
h2,
h3,
h4,
h5,
h6 {
	display: flex;
	flex-direction: column;
  
	small {
	  order: -1;
	  font-weight: var(--font-weight-regular);
	}
}

a {
	color: var(--color-primary);
  
	&:hover {
	  color: var(--color-primary-hover);
	}
  
	&:active {
	  color: var(--color-primary-active);
	}
}

[aria-hidden="true"] {
	display: none;
}

/* Helper classes */
.visually-hidden {
	position: absolute;
	left: -10000px;
	top: auto;
	width: 1px;
	height: 1px;
	overflow: hidden;
}

header {
	margin-block: var(--space-xl);

	ol {
		display: grid;
		list-style: none;
        gap: var(--space-s);
        margin-block: var(--space-l);
        grid-template-columns: 1fr;
        padding: 0;
	}

	li {
		padding: 0;
		margin: 0;
	}

	a {
		display: grid;
		grid-template-areas: "icon title" "icon description";
		grid-template-columns: auto 1fr;
		grid-template-rows: auto 1fr;
		gap: var(--space-xs) var(--space-s);
		padding: var(--space-m);
		height: calc(100% - 2 * var(--space-m));
        color: var(--color-text);
        text-decoration: none;

		&:hover,
		&:focus {
			background-color: var(--color-secondary-hover);
		}

		&.active {
			background-color: var(--color-background-alt);
		}

		.icon {
			grid-area: icon;
            display: flex;
            align-items: center;
            justify-content: center;
			font-size: var(--font-size-l);
            width: var(--space-xl);
            height: var(--space-xl);
            border-radius: 50%;
            background-color: var(--color-background);
            border: 1px solid var(--color-border);
		}

		strong {
			grid-area: title;
            font-size: var(--font-size-m);
			line-height: var(--line-height-s);
            margin: 0;
		}

		small {
			grid-area: description;
            font-size: var(--font-size-s);
			line-height: var(--line-height-m);
            margin: 0;
            color: var(--color-text-soft);
		}
    }
}

@media screen and (min-width: 32em) and (max-width: 48em) {
	header ol {
		grid-template-columns: 1fr 1fr;
		gap: var(--space-m);
	}
}

@media screen and (min-width: 48em) {
	header ol {
		grid-template-columns: 1fr 1fr 1fr;
		gap: var(--space-l);
	}
}