/* Use UA theme colors correctly */
:root {
	color-scheme: light dark;
}

/* Base knobs (updated by JS) */
:root {
	--h: 285;
	--c: 0.16;
	--l: 0.64;

	/* One base color drives everything */
	--ink: oklch(calc(var(--l) * 100%) var(--c) var(--h));

	/* Auto theme surfaces */
	--bg: light-dark(oklch(98% 0.01 260), oklch(16% 0.02 260));
	--panel: light-dark(oklch(99% 0.01 260), oklch(20% 0.03 260));
	--text: light-dark(oklch(22% 0.02 260), oklch(94% 0.02 260));
	--muted: light-dark(oklch(45% 0.02 260), oklch(75% 0.02 260));

	/* Derived states via relative colors */
	--ink-hover: oklch(from var(--ink) calc(l - 7%) c h);
	--ink-active: oklch(from var(--ink) calc(l - 12%) c h);
	--ring: oklch(from var(--ink) 85% 0.08 h);

	/* HWB accent surface tracks hue but stays soft */
	--accent-surface: hwb(var(--h) 88% 0% / 0.9);
	--accent-border: hwb(var(--h) 55% 5% / 0.8);

	/* Card surface uses a faint tint of ink */
	--card: color-mix(
		in oklch,
		var(--panel) 90%,
		oklch(from var(--ink) 70% 0.06 h) 10%
	);
}

* {
	box-sizing: border-box;
}
html,
body {
	height: 100%;
}
body {
	margin: 0;
	font: 16px/1.4 system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
	background: radial-gradient(
			1200px 800px at 10% 10%,
			oklch(from var(--ink) 88% 0.08 h),
			transparent 55%
		),
		radial-gradient(
			1200px 800px at 90% 20%,
			oklch(from var(--ink) 80% 0.06 calc(h + 40)),
			transparent 55%
		),
		var(--bg);
	color: var(--text);
}

.wrap {
	max-width: 980px;
	margin: 0 auto;
	padding: 28px 18px 40px;
}

.top h1 {
	margin: 0 0 6px;
	letter-spacing: -0.02em;
}
.top p {
	margin: 0;
	color: var(--muted);
}

.panel {
	margin-top: 18px;
	padding: 18px;
	border-radius: 22px;
	background: color-mix(in oklch, var(--panel) 92%, black 8%);
	border: 1px solid color-mix(in oklch, var(--panel) 75%, var(--ink) 25%);
	box-shadow: 0 14px 50px color-mix(in oklch, black 22%, transparent);
}

.controls {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 12px;
	align-items: end;
}

label {
	display: grid;
	gap: 8px;
	padding: 12px 12px 10px;
	border-radius: 16px;
	background: var(--card);
	border: 1px solid color-mix(in oklch, var(--panel) 65%, var(--ink) 35%);
}

label output {
	justify-self: end;
	color: var(--muted);
	font-variant-numeric: tabular-nums;
}

.toggle {
	grid-column: 1 / -1;
	display: flex;
	gap: 10px;
	align-items: center;
}

.grid {
	margin-top: 14px;
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 12px;
}

.card {
	border-radius: 18px;
	padding: 16px;
	background: var(--card);
	border: 1px solid color-mix(in oklch, var(--panel) 55%, var(--ink) 45%);
	box-shadow: 0 10px 30px color-mix(in oklch, black 18%, transparent);
}

.card h2 {
	margin: 0 0 8px;
	font-size: 1.05rem;
}
.card p {
	margin: 0 0 12px;
	color: var(--muted);
}

.card.accent {
	background: color-mix(in oklch, var(--card) 60%, var(--accent-surface) 40%);
	border-color: var(--accent-border);
}

.row {
	display: flex;
	gap: 10px;
	flex-wrap: wrap;
	align-items: center;
}

.btn {
	border: 0;
	border-radius: 999px;
	padding: 10px 14px;
	font-weight: 650;
	cursor: pointer;
	transition: transform 120ms ease, background 160ms ease, box-shadow 160ms ease;
	outline: none;
}

.btn.primary {
	background: var(--ink);
	color: white;
}
:root[data-auto-ink="1"] .btn.primary {
	color: contrast-color(var(--ink));
}

.btn.primary:hover {
	background: var(--ink-hover);
	transform: translateY(-1px);
}
.btn.primary:active {
	background: var(--ink-active);
	transform: translateY(0px) scale(0.99);
}

.btn.ghost {
	background: color-mix(in oklch, transparent 70%, var(--ink) 30%);
	color: var(--text);
	border: 1px solid color-mix(in oklch, var(--panel) 40%, var(--ink) 60%);
}
.btn.ghost:hover {
	box-shadow: 0 0 0 4px var(--ring);
}

.pill {
	padding: 6px 10px;
	border-radius: 999px;
	background: hwb(var(--h) 78% 0% / 0.85);
	border: 1px solid hwb(var(--h) 45% 8% / 0.8);
}
.pill.alt {
	background: hwb(calc(var(--h) + 35) 80% 0% / 0.85);
	border-color: hwb(calc(var(--h) + 35) 45% 8% / 0.8);
}

.field {
	width: 100%;
	border-radius: 14px;
	padding: 10px 12px;
	border: 1px solid color-mix(in oklch, var(--panel) 40%, var(--ink) 60%);
	background: color-mix(in oklch, var(--panel) 70%, transparent);
	color: var(--text);
	outline: none;
}
.field:focus {
	box-shadow: 0 0 0 4px var(--ring);
}

::search-text {
	background: oklch(from var(--ink) 85% 0.18 h);
	color: oklch(from var(--ink) 18% 0.03 h);
}

mark {
	background: color-mix(in oklch, var(--ring) 55%, transparent);
	color: inherit;
	padding: 0 4px;
	border-radius: 6px;
}

.foot {
	margin-top: 14px;
	color: var(--muted);
	font-size: 0.95rem;
}

@media (max-width: 920px) {
	.grid {
		grid-template-columns: 1fr;
	}
	.controls {
		grid-template-columns: 1fr;
	}
}