:root {
	--bg: #ffffff;
	--surface: #ffffff;
	--text: #0a0a0a;
	--muted: #4a4a4a;
	--line: #dedede;
	--line-strong: #bdbdbd;
	--shadow: none;
	--accent: #005fcc;

	--space-1: 4px;
	--space-2: 8px;
	--space-3: 12px;
	--space-4: 16px;
	--space-5: 20px;
	--space-6: 24px;
	--space-7: 32px;
	--space-8: 40px;

	--container: 920px;
	--gutter: 22px;
	--radius: 14px;
}

* {
	box-sizing: border-box;
}

html,
body {
	height: 100%;
}

body {
	margin: 0;
	background: var(--bg);
	color: var(--text);
	font-family: "Open Sans", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
	-webkit-font-smoothing: antialiased;
	text-rendering: optimizeLegibility;
	line-height: 1.6;
}

a {
	color: inherit;
	text-decoration: none;
	border-bottom: 1px solid transparent;
}

a:hover {
	border-bottom-color: var(--accent);
}

a:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 3px;
	border-bottom-color: transparent;
}

::selection {
	background: rgba(17, 17, 17, 0.10);
}

/* Top bar */
.topbar {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 10;
	background: var(--bg);
	transform: translateY(-110%);
	transition: transform 420ms cubic-bezier(0.2, 0.9, 0.2, 1);
}

body.is-menu-visible .topbar {
	transform: translateY(0);
}

.topbar__inner {
	max-width: calc(var(--container) + (2 * var(--gutter)));
	margin: 0 auto;
	padding: var(--space-4) var(--gutter);
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-4);
}

.topbar__brandText {
	font-family: "Raleway", "Open Sans", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
	font-weight: 300;
	letter-spacing: -0.02em;
}

.topbar__nav {
	display: flex;
	gap: var(--space-4);
}

.topbar__link {
	font-size: 14px;
	color: var(--muted);
	padding: 6px 2px;
}

.topbar__link:hover {
	color: var(--text);
	border-bottom-color: transparent;
}

.topbar__link:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 3px;
	border-radius: 6px;
}

.topbar__divider {
	height: 1px;
	background: var(--line);
}

/* Hero */
.hero {
	min-height: 100vh;
	display: grid;
	place-items: center;
	position: relative;
	color: var(--text);
	cursor: pointer;
}

.hero__center {
	padding: 64px var(--gutter);
}

.hero__logo {
	font-family: "Raleway", "Open Sans", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
	font-weight: 400;
	letter-spacing: -0.04em;
	line-height: 1;
	font-size: clamp(42px, 4.8vw, 78px);
	transition:
		opacity 260ms ease,
		transform 260ms ease;
}

@media (min-width: 1280px) {
	.hero__logo {
		font-size: clamp(58px, 5.5vw, 110px);
	}
}

@media (min-width: 1920px) {
	.hero__logo {
		font-size: clamp(80px, 5.8vw, 140px);
	}
}

body.is-menu-visible .hero__logo {
	opacity: 0;
	transform: translateY(-10px);
	pointer-events: none;
}

/* Down chevron: only two strokes */
.down {
	position: absolute;
	left: 50%;
	bottom: 28px;
	transform: translateX(-50%);
	width: 52px;
	height: 34px;
	display: grid;
	place-items: center;
	opacity: 0.65;
	color: inherit;
	transition: opacity 220ms ease;
}

.down__chevron {
	width: 44px;
	height: 22px;
	position: relative;
	transform: scale(1);
	transition: transform 220ms ease;
}

.down__chevron::before,
.down__chevron::after {
	content: "";
	position: absolute;
	top: 10px;
	width: 28px;
	height: 1px;
	background: currentColor;
	border-radius: 999px;
	left: 50%;
}

.down__chevron::before {
	transform-origin: 100% 50%;
	transform: translateX(-100%) rotate(45deg);
}

.down__chevron::after {
	transform-origin: 0 50%;
	transform: rotate(-45deg);
}

body.is-menu-visible .down {
	opacity: 0;
	pointer-events: none;
}

@media (hover: hover) and (pointer: fine) {
	.hero:hover .down {
		opacity: 0.95;
	}
	.hero:hover .down__chevron {
		transform: scale(1.12);
	}
}

/* Content */
.content {
	padding: 110px 0 80px;
}

.container {
	max-width: var(--container);
	margin: 0 auto;
	padding: 0 var(--gutter);
}

.kicker {
	font-size: 12px;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	color: var(--muted);
	margin-bottom: var(--space-4);
}

h1,
h2,
h3 {
	letter-spacing: -0.02em;
	margin: 0 0 var(--space-3);
}

h1 {
	font-size: clamp(30px, 3vw, 44px);
	line-height: 1.08;
}

h2 {
	font-size: clamp(22px, 2vw, 28px);
	line-height: 1.2;
	margin-top: var(--space-7);
}

h3 {
	font-size: 18px;
	line-height: 1.25;
	margin-top: var(--space-5);
}

p {
	margin: 0 0 var(--space-3);
	color: var(--text);
	font-size: 16px;
	line-height: 1.7;
	max-width: 70ch;
}

.lead {
	font-size: 18px;
	color: var(--muted);
}

small {
	color: var(--muted);
}

code {
	font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
	font-size: 0.92em;
	background: rgba(17, 17, 17, 0.06);
	padding: 0.12em 0.34em;
	border-radius: 6px;
}

pre {
	margin: 0 0 var(--space-4);
	max-width: 100%;
	overflow: auto;
}

.codeblock {
	border: 1px solid var(--line-strong);
	border-radius: var(--radius);
	padding: var(--space-4);
	background: #f7f7f7;
}

.codeblock code {
	display: block;
	white-space: pre;
	padding: 0;
	background: transparent;
}

blockquote {
	margin: var(--space-5) 0;
	padding: var(--space-3) var(--space-4);
	border-left: 3px solid var(--text);
	color: var(--text);
	background: #f5f5f5;
	border-radius: 10px;
}

blockquote cite {
	display: block;
	margin-top: 10px;
	font-style: normal;
	color: var(--muted);
	font-size: 13px;
}

ul {
	margin: var(--space-2) 0 0;
	padding-left: 18px;
	color: var(--text);
}

ol {
	margin: var(--space-2) 0 0;
	padding-left: 20px;
	color: var(--text);
}

.checklist li {
	margin: var(--space-2) 0;
}

li {
	margin: var(--space-2) 0;
	line-height: 1.5;
}

hr {
	border: 0;
	height: 1px;
	background: var(--line);
	margin: var(--space-7) 0;
}

.grid {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: var(--space-4);
	margin: var(--space-4) 0 0;
}

@media (max-width: 720px) {
	.topbar__nav {
		gap: 12px;
	}
	.grid {
		grid-template-columns: 1fr;
	}
}

.card {
	border: 1px solid var(--line-strong);
	border-radius: var(--radius);
	padding: var(--space-5);
	background: var(--surface);
	box-shadow: none;
}

.card ul {
	margin-top: 0;
}

.card__title {
	font-size: 13px;
	color: var(--muted);
	margin-bottom: var(--space-3);
}

.row {
	display: flex;
	gap: var(--space-3);
	flex-wrap: wrap;
}

.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	height: 40px;
	padding: 0 14px;
	border-radius: 12px;
	border: 1px solid var(--text);
	background: var(--text);
	color: var(--bg);
	font-size: 14px;
	font-weight: 600;
	cursor: pointer;
	transition:
		background 140ms ease,
		transform 140ms ease,
		border-color 140ms ease;
}

.btn:hover {
	border-bottom-color: transparent;
	background: #000;
}

.btn:active {
	transform: translateY(1px);
}

.btn:focus-visible {
	outline: 3px solid var(--accent);
	outline-offset: 2px;
}

.btn--ghost {
	background: transparent;
	color: var(--text);
	border-color: var(--line-strong);
}

.btn--ghost:hover {
	background: #f0f0f0;
}

.hint {
	margin-top: var(--space-3);
	font-size: 12.5px;
	color: var(--muted);
}

.accordion {
	border: 1px solid var(--line-strong);
	border-radius: var(--radius);
	padding: var(--space-4);
	background: var(--surface);
	margin: var(--space-3) 0;
}

.accordion summary {
	cursor: pointer;
	font-weight: 600;
	letter-spacing: -0.01em;
}

.accordion[open] summary {
	margin-bottom: var(--space-2);
}

.footer {
	margin-top: 26px;
	padding-top: 10px;
}

@media (prefers-reduced-motion: reduce) {
	.down__chevron {
		transition: none;
	}
	.topbar,
	.hero__logo {
		transition: none;
	}
}