/*
 * ImFusion documentation landing page.
 * Token names and values follow the ImFusion Web UI design system (@imfusion/web-ui).
 * Color scheme follows the OS; force one with <html data-imf-ui-color-scheme="light|dark">.
 */

@font-face {
	font-family: "FK Grotesk Neue";
	src: url("./FKGroteskNeue-Regular.woff2") format("woff2");
	font-weight: 400;
	font-display: swap;
}
@font-face {
	font-family: "FK Grotesk Neue";
	src: url("./FKGroteskNeue-Medium.woff2") format("woff2");
	font-weight: 500;
	font-display: swap;
}
@font-face {
	font-family: "CoFo Sans Mono";
	src: url("./CoFoSansSemi-Mono-Regular.woff2") format("woff2");
	font-weight: 400;
	font-display: swap;
}

:root {
	color-scheme: light dark;

	--imf-ui-color-brand: oklch(0.56 0.25 264);
	--imf-ui-color-bg-brand: var(--imf-ui-color-brand);
	--imf-ui-color-bg-main: light-dark(oklch(0.995 0.006 210), oklch(0.205 0.006 210));
	--imf-ui-color-fg-primary: light-dark(oklch(0.55 0.25 264), oklch(0.75 0.25 264));
	--imf-ui-color-fg-oncolor: oklch(0.95 0.006 210);
	--imf-ui-color-fg-main: light-dark(oklch(0.15 0.006 210), oklch(0.95 0.006 210));
	--imf-ui-color-fg-support: color-mix(in oklch, var(--imf-ui-color-fg-main) 65%, transparent);

	--imf-ui-font-family-sans: "FK Grotesk Neue", ui-sans-serif, system-ui, sans-serif;
	--imf-ui-font-family-mono: "CoFo Sans Mono", ui-monospace, monospace;
	--imf-ui-font-size-hero: clamp(3rem, 1.8rem + 6vw, 9rem);
	--imf-ui-font-size-fluid-0: clamp(1.125rem, 4.5vw, 1.3125rem);
	--imf-ui-font-letterspacing-hero: -0.04em;
	--imf-ui-font-letterspacing-brand: -0.02em;
	--imf-ui-font-letterspacing-wide: 0.06em;

	--imf-ui-duration-moderate-1: 180ms;
	--imf-ui-ease-1: cubic-bezier(0.25, 0, 0.5, 1);

	--gutter: clamp(1rem, 3.5vw, 4rem);
	/* Light: blue on off-white. Dark: inverted to off-white on ink, headings stay blue. */
	--page-ink: light-dark(var(--imf-ui-color-fg-primary), var(--imf-ui-color-fg-main));
	--rule: 1px solid light-dark(var(--imf-ui-color-fg-primary), color-mix(in oklch, var(--imf-ui-color-fg-main) 35%, transparent));
	--hairline: 1px solid light-dark(
		color-mix(in oklch, var(--imf-ui-color-fg-main) 14%, transparent),
		color-mix(in oklch, var(--imf-ui-color-fg-main) 25%, transparent)
	);
}

[data-imf-ui-color-scheme="light"] { color-scheme: light; }
[data-imf-ui-color-scheme="dark"] { color-scheme: dark; }

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

body {
	margin: 0;
	background: var(--imf-ui-color-bg-main);
	color: var(--page-ink);
	font-family: var(--imf-ui-font-family-sans);
	font-size: 1rem;
	line-height: 1.3;
	letter-spacing: var(--imf-ui-font-letterspacing-brand);
	-webkit-font-smoothing: antialiased;
}

h1, h2, p, ul {
	margin: 0;
}

ul {
	padding: 0;
	list-style: none;
}

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

a:focus-visible {
	outline: 2px solid var(--imf-ui-color-fg-primary);
	outline-offset: 3px;
}

.page {
	display: flex;
	flex-direction: column;
	min-height: 100vh;
	max-width: 96rem;
	margin-inline: auto;
	padding-inline: var(--gutter);
}

main {
	flex: 1;
	padding-bottom: 5rem;
}

/* Utility voice: uppercase mono. */
.breadcrumb,
.links,
.label,
.button {
	font-family: var(--imf-ui-font-family-mono);
	font-size: 0.875rem;
	font-weight: 400;
	letter-spacing: var(--imf-ui-font-letterspacing-wide);
	text-transform: uppercase;
}

/* ---------- Masthead ---------- */

.masthead {
	border-bottom: var(--rule);
}

.topbar {
	display: flex;
	flex-wrap: wrap;
	align-items: baseline;
	justify-content: space-between;
	gap: 0.5rem 2rem;
	padding-block: 2.5rem 0.75rem;
	border-bottom: var(--rule);
}

.breadcrumb a:hover,
.links a:hover {
	text-decoration: underline;
	text-underline-offset: 0.2em;
}

.links {
	display: flex;
	flex-wrap: wrap;
	gap: 0.25rem 1.5rem;
}

.title {
	color: var(--imf-ui-color-fg-primary);
	padding-block: 2rem 2.5rem;
	font-size: min(var(--imf-ui-font-size-hero), 12vw);
	font-weight: 500;
	line-height: 1;
	letter-spacing: var(--imf-ui-font-letterspacing-hero);
}

/* ---------- Content ---------- */

.lead {
	max-width: 45ch;
	margin-block: 3rem 4rem;
	font-size: var(--imf-ui-font-size-fluid-0);
	text-wrap: pretty;
}

section + section {
	margin-top: 3.5rem;
}

.label {
	display: inline-block;
	margin-bottom: 1.25rem;
	padding: 0.3rem 0.5rem 0.25rem;
	background: var(--imf-ui-color-bg-brand);
	color: var(--imf-ui-color-fg-oncolor);
	line-height: 1.15;
}

.cards {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(min(100%, 22rem), 1fr));
	gap: 1.5rem;
}

.card {
	position: relative;
	display: flex;
	flex-direction: column;
	gap: 1rem;
	padding: 1.75rem;
	background: var(--imf-ui-color-bg-main);
	border: var(--hairline);
	color: var(--imf-ui-color-fg-main);
	transition:
		border-color var(--imf-ui-duration-moderate-1) var(--imf-ui-ease-1),
		box-shadow var(--imf-ui-duration-moderate-1) var(--imf-ui-ease-1);
}

.card:hover,
.card:focus-within {
	border-color: var(--imf-ui-color-fg-primary);
	/* One hard, unblurred shadow when a surface must read as lifted. */
	box-shadow: 4px 4px 0 0 var(--imf-ui-color-fg-primary);
}

.card__head {
	display: flex;
	align-items: center;
	gap: 1.25rem;
}

.card__icon {
	display: block;
	align-self: flex-start;
	width: 5rem;
	height: 5rem;
}

.card__head .card__icon {
	align-self: center;
}

.card__title {
	font-size: 1.75rem;
	font-weight: 500;
	line-height: 1.1;
}

.card__text {
	color: var(--imf-ui-color-fg-support);
	line-height: 1.5;
	text-wrap: pretty;
}

/* Outlined link tile: label bottom-left, arrow bottom-right. */
.button {
	--fill: transparent;
	--ink: var(--imf-ui-color-fg-primary);
	display: flex;
	align-items: flex-end;
	justify-content: space-between;
	gap: 1rem;
	width: min(100%, 16rem);
	min-height: 4rem;
	margin-top: auto;
	padding: 0.75rem;
	border: 1px solid var(--imf-ui-color-fg-primary);
	background: var(--fill);
	color: var(--ink);
	line-height: 1.15;
	transition:
		background-color var(--imf-ui-duration-moderate-1) var(--imf-ui-ease-1),
		color var(--imf-ui-duration-moderate-1) var(--imf-ui-ease-1);
}

.button::before {
	content: "\2197";
	order: 1;
	font-size: 1rem;
	line-height: 1;
}

/* The button's link covers the whole card. */
.button::after {
	content: "";
	position: absolute;
	inset: 0;
}

.card:hover .button,
.button:focus-visible {
	--fill: var(--imf-ui-color-bg-brand);
	--ink: var(--imf-ui-color-fg-oncolor);
}

.button:focus-visible {
	outline: none;
}

.card:has(.button:focus-visible) {
	outline: 2px solid var(--imf-ui-color-fg-primary);
	outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
	.card,
	.button {
		transition: none;
	}
}