/* Ghost Keys (lab/ghostkeys.htm). Colors come from the site's theme
   variables, so the experiment follows the visitor's theme, dark mode,
   and style picks from the Theme Customizer. */

main#mainContent.gkPage {
	max-width: none;
	width: 100%;
	margin: 0 auto;
	padding: 0 20px;
	box-sizing: border-box;
}

main#mainContent.gkPage > * {
	margin-left: auto;
	margin-right: auto;
}

.gkIntro,
.gkProse {
	max-width: 770px;
	padding: 0 75px;
	box-sizing: border-box;
}

.gkIntro {
	margin-top: 30px;
	text-align: center;
}

#mainContent .gkIntro h1 {
	margin: 4px 0 12px;
}

#mainContent .gkIntro p {
	margin-left: auto;
	margin-right: auto;
}

#mainContent .gkKicker {
	margin: 0;
	font-family: var(--monoFonts, ui-monospace, monospace);
	font-size: 13px;
	letter-spacing: .16em;
	text-transform: uppercase;
	color: var(--primary);
}

#mainContent .gkKicker a {
	color: inherit;
	text-decoration: none;
	border-bottom: 1px solid currentColor;
}

.gkProse {
	margin-top: 40px;
}

.gkVisuallyHidden {
	position: absolute !important;
	width: 1px;
	height: 1px;
	overflow: hidden;
	clip: rect(0 0 0 0);
	clip-path: inset(50%);
	white-space: nowrap;
}

/* ---------- Tokens ---------- */

.gk {
	--gkAccent: var(--primary, #0798ff);
	--gkInk: var(--darkText, #222);
	--gkSoft: var(--darkTextSecondary, #5b5b5b);
	--gkStageTop: color-mix(in srgb, var(--gkAccent) 10%, var(--pageBackground, #fff));
	--gkStageBottom: var(--pageBackground, #fff);
	--gkLine: color-mix(in srgb, var(--gkAccent) 38%, transparent);
	--gkFaint: color-mix(in srgb, var(--gkAccent) 14%, transparent);
	--gkGlow: color-mix(in srgb, var(--gkAccent) 45%, transparent);
	--gkBoardFace: color-mix(in srgb, var(--gkAccent) 6%, #f4f7fb);
	--gkBoardEdge: color-mix(in srgb, var(--gkAccent) 30%, #8f9aa8);
	--gkCap: #ffffff;
	--gkCapEdge: color-mix(in srgb, var(--gkAccent) 16%, #c9d1dc);
	--gkCapInk: #20262e;
	--gkModInk: #7a8593;
	--gkHole: color-mix(in srgb, var(--gkAccent) 10%, #dfe6ee);
	--gkWrongColor: #e5484d;
	--gkGoodColor: var(--gkAccent);
	--gkRadius: 7px;
	--gkTilt: 34deg;
	--gkTurn: 0deg;
	--gkLean: 0deg;
	--gkFont: var(--monoFonts, ui-monospace, "SF Mono", Menlo, monospace);
	position: relative;
	max-width: 1180px;
	margin-top: 26px;
	color: var(--gkInk);
}

html.theme_dark .gk {
	--gkStageTop: color-mix(in srgb, var(--gkAccent) 22%, #05070c);
	--gkStageBottom: #07090e;
	--gkLine: color-mix(in srgb, var(--gkAccent) 60%, transparent);
	--gkFaint: color-mix(in srgb, var(--gkAccent) 22%, transparent);
	--gkGlow: color-mix(in srgb, var(--gkAccent) 70%, transparent);
	--gkBoardFace: color-mix(in srgb, var(--gkAccent) 10%, #10141b);
	--gkBoardEdge: color-mix(in srgb, var(--gkAccent) 40%, #05070a);
	--gkCap: color-mix(in srgb, var(--gkAccent) 8%, #1c222c);
	--gkCapEdge: #05070b;
	--gkCapInk: #eef5ff;
	--gkModInk: #8796a8;
	--gkHole: #04060a;
	--gkWrongColor: #ff6b70;
}

html.style_minimal .gk { --gkRadius: 5px; --gkTilt: 26deg; }
html.style_platformer .gk,
html.style_scifi .gk { --gkRadius: 2px; }
html.style_ukiyoe .gk,
html.style_nature .gk { --gkRadius: 10px; }

/* ---------- HUD ---------- */

.gkHud {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: space-between;
	gap: 12px 18px;
	padding: 12px 14px;
	border: 1px solid var(--gkLine);
	border-bottom: none;
	border-radius: 14px 14px 0 0;
	background: color-mix(in srgb, var(--gkStageTop) 70%, var(--pageBackground, #fff));
	font-family: var(--gkFont);
	font-size: 13px;
}

.gkModes,
.gkTools {
	display: flex;
	flex-wrap: wrap;
	gap: 6px;
}

.gk button.gkModeButton,
.gk button.gkToolButton {
	appearance: none;
	margin: 0;
	padding: 7px 12px;
	border: 1px solid var(--gkLine);
	border-radius: 999px;
	background: transparent;
	color: var(--gkInk);
	font: inherit;
	font-size: 13px;
	line-height: 1.2;
	cursor: pointer;
	transition: background-color .15s, color .15s, box-shadow .15s;
}

.gk button.gkModeButton:hover,
.gk button.gkToolButton:hover {
	background: var(--gkFaint);
}

.gk button.gkModeButton[aria-pressed="true"],
.gk button.gkToolButton.gkPrimary {
	background: var(--gkAccent);
	border-color: var(--gkAccent);
	color: var(--textOnPrimary, #fff);
	box-shadow: 0 0 14px var(--gkGlow);
}

.gk button.gkToolButton[aria-pressed="false"] {
	opacity: .75;
}

.gk button:focus-visible,
.gkChip:focus-visible {
	outline: 3px solid var(--gkAccent);
	outline-offset: 2px;
}

.gkStats {
	display: flex;
	gap: 18px;
	margin: 0;
}

.gkStats div {
	text-align: center;
}

.gkStats dt {
	font-size: 10px;
	letter-spacing: .14em;
	text-transform: uppercase;
	color: var(--gkSoft);
}

.gkStats dd {
	margin: 2px 0 0;
	font-size: 17px;
	font-variant-numeric: tabular-nums;
	color: var(--gkInk);
}

/* ---------- Stage ---------- */

.gkStage {
	container-type: inline-size;
	position: relative;
	overflow: hidden;
	padding: 34px 20px 22px;
	border: 1px solid var(--gkLine);
	border-radius: 0 0 14px 14px;
	background:
		radial-gradient(ellipse 70% 55% at 50% 38%, var(--gkFaint), transparent 70%),
		linear-gradient(180deg, var(--gkStageTop), var(--gkStageBottom));
	-webkit-user-select: none;
	user-select: none;
}

/* Corner brackets, like a viewfinder. */
.gkStage::before,
.gkStage::after {
	content: "";
	position: absolute;
	width: 22px;
	height: 22px;
	border: 2px solid var(--gkLine);
	pointer-events: none;
}

.gkStage::before {
	top: 10px;
	left: 10px;
	border-right: none;
	border-bottom: none;
}

.gkStage::after {
	top: 10px;
	right: 10px;
	border-left: none;
	border-bottom: none;
}

.gkFloor {
	position: absolute;
	left: -30%;
	right: -30%;
	bottom: -10%;
	height: 75%;
	background-image:
		linear-gradient(var(--gkFaint) 1px, transparent 1px),
		linear-gradient(90deg, var(--gkFaint) 1px, transparent 1px);
	background-size: 46px 46px;
	transform: perspective(500px) rotateX(62deg);
	transform-origin: 50% 100%;
	-webkit-mask-image: linear-gradient(180deg, transparent, #000 60%);
	mask-image: linear-gradient(180deg, transparent, #000 60%);
	pointer-events: none;
	animation: gkFloorDrift 6s linear infinite;
}

@keyframes gkFloorDrift {
	to { background-position: 0 46px, 0 0; }
}

.gkScene {
	position: relative;
	perspective: 1500px;
	perspective-origin: 50% 0%;
	margin-bottom: calc(var(--u) * .1);
	--u: clamp(19px, (100cqi - 40px) / 16, 62px);
}

/* ---------- Keyboard ---------- */

.gkBoard {
	--g: calc(var(--u) * .1);
	position: relative;
	width: calc(var(--u) * 15);
	margin: 0 auto;
	padding: calc(var(--u) * .32);
	border-radius: calc(var(--gkRadius) * 2.2);
	background:
		linear-gradient(180deg, color-mix(in srgb, #fff 18%, transparent), transparent 40%),
		var(--gkBoardFace);
	border: 1px solid var(--gkLine);
	box-shadow:
		0 calc(var(--u) * .28) 0 var(--gkBoardEdge),
		0 calc(var(--u) * .28) 0 1px var(--gkLine),
		0 calc(var(--u) * .9) calc(var(--u) * 1.2) color-mix(in srgb, var(--gkAccent) 22%, transparent),
		0 0 calc(var(--u) * .6) var(--gkFaint);
	transform: rotateX(calc(var(--gkTilt) + var(--gkLean))) rotateZ(calc(var(--gkTurn) * -.35)) rotateY(var(--gkTurn));
	transform-origin: 50% 60%;
	transition: transform .5s cubic-bezier(.2,.8,.3,1);
	animation: gkBoot .9s cubic-bezier(.2,.8,.3,1) both;
}

@keyframes gkBoot {
	from { opacity: 0; transform: rotateX(70deg) translateY(30px); }
}

.gk.gkFlat {
	--gkTilt: 0deg;
}

.gk.gkDragging .gkBoard {
	transition-duration: 0s;
}

/* A scan line that sweeps the board. */
.gkBoard::after {
	content: "";
	position: absolute;
	inset: 0;
	border-radius: inherit;
	background: linear-gradient(100deg, transparent 40%, color-mix(in srgb, var(--gkAccent) 20%, transparent) 50%, transparent 60%);
	background-size: 250% 100%;
	animation: gkScan 5s ease-in-out infinite;
	pointer-events: none;
}

@keyframes gkScan {
	from { background-position: 120% 0; }
	to { background-position: -120% 0; }
}

.gkRow {
	display: flex;
	gap: var(--g);
}

.gkRow + .gkRow {
	margin-top: var(--g);
}

.gkKey {
	--depth: calc(var(--u) * .1);
	position: relative;
	flex: var(--w) 0 calc(var(--w) * var(--u) - var(--g));
	box-sizing: border-box;
	height: calc(var(--u) * .9);
	margin: 0;
	padding: 0;
	border: 0;
	background: none;
	font: inherit;
	color: var(--gkCapInk);
	cursor: default;
}

.gkCap {
	position: absolute;
	inset: 0;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	border-radius: var(--gkRadius);
	background: linear-gradient(180deg, color-mix(in srgb, #fff 10%, var(--gkCap)), var(--gkCap));
	border: 1px solid var(--gkCapEdge);
	box-shadow: 0 var(--depth) 0 var(--gkCapEdge), 0 calc(var(--depth) + 2px) 6px color-mix(in srgb, #000 14%, transparent);
	transform: translateY(calc(var(--depth) * -1));
	transition: transform .15s, box-shadow .15s, background-color .2s, border-color .2s;
	font-family: var(--gkFont);
	line-height: 1;
}

.gkMain {
	font-size: calc(var(--u) * .34);
	font-weight: 600;
}

.gkShift {
	font-size: calc(var(--u) * .22);
	opacity: .55;
	margin-bottom: calc(var(--u) * .04);
}

.gkShift:empty {
	display: none;
}

.gkMod .gkCap {
	align-items: flex-start;
	justify-content: flex-end;
	padding: 0 0 calc(var(--u) * .12) calc(var(--u) * .14);
	box-sizing: border-box;
}

.gkMod.gkRight .gkCap {
	align-items: flex-end;
	padding: 0 calc(var(--u) * .14) calc(var(--u) * .12) 0;
}

.gkModLabel {
	font-size: calc(var(--u) * .19);
	color: var(--gkModInk);
	text-transform: lowercase;
	white-space: nowrap;
}

.gkBump .gkCap::after {
	content: "";
	position: absolute;
	bottom: calc(var(--u) * .14);
	left: 50%;
	width: calc(var(--u) * .2);
	height: 2px;
	margin-left: calc(var(--u) * -.1);
	border-radius: 2px;
	background: currentColor;
	opacity: .5;
}

/* Characters that are part of the round but not missing. */
.gkChar[data-state="given"] .gkCap {
	opacity: .78;
}

/* A missing key: a glowing, recessed socket. */
.gkChar[data-state="open"] {
	cursor: pointer;
}

.gkChar[data-state="open"] .gkCap {
	transform: none;
	background: var(--gkHole);
	border: 1px dashed var(--gkLine);
	box-shadow: inset 0 2px 6px color-mix(in srgb, #000 22%, transparent), 0 0 0 0 transparent;
}

.gkChar[data-state="open"] .gkMain,
.gkChar[data-state="open"] .gkShift {
	visibility: hidden;
}

.gkChar[data-state="open"] .gkCap::before {
	content: "";
	position: absolute;
	inset: 22%;
	border-radius: 50%;
	background: radial-gradient(circle, var(--gkFaint), transparent 70%);
	animation: gkBreathe 2.6s ease-in-out infinite;
}

@keyframes gkBreathe {
	50% { opacity: .2; }
}

.gk.gkHolding .gkChar[data-state="open"] .gkCap,
.gk.gkDragging .gkChar[data-state="open"] .gkCap {
	border-color: var(--gkAccent);
	box-shadow: inset 0 2px 6px color-mix(in srgb, #000 22%, transparent), 0 0 10px var(--gkFaint);
}

.gkChar.gkTarget .gkCap,
.gkChar[data-state="open"]:hover .gkCap {
	border-style: solid;
	border-color: var(--gkAccent);
	background: color-mix(in srgb, var(--gkAccent) 22%, var(--gkHole));
	box-shadow: 0 0 0 2px var(--gkGlow), 0 0 22px var(--gkGlow);
}

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

.gkChar:focus-visible .gkCap {
	outline: 3px solid var(--gkAccent);
	outline-offset: 3px;
}

.gkChar[data-state="placed"] .gkCap {
	border-color: var(--gkAccent);
	box-shadow: 0 var(--depth) 0 color-mix(in srgb, var(--gkAccent) 55%, var(--gkCapEdge)), 0 0 14px var(--gkFaint);
}

.gkChar[data-state="placed"] .gkMain {
	color: color-mix(in srgb, var(--gkAccent) 70%, var(--gkCapInk));
}

.gkChar.gkSnap .gkCap {
	animation: gkSnap .45s cubic-bezier(.2,1.6,.4,1);
}

@keyframes gkSnap {
	0% { transform: translateY(calc(var(--depth) * -4)) scale(1.18); box-shadow: 0 0 30px var(--gkGlow); }
	100% { transform: translateY(calc(var(--depth) * -1)); }
}

.gkChar.gkWrong .gkCap {
	border-style: solid;
	border-color: var(--gkWrongColor);
	background: color-mix(in srgb, var(--gkWrongColor) 22%, var(--gkHole));
	box-shadow: 0 0 18px color-mix(in srgb, var(--gkWrongColor) 60%, transparent);
	animation: gkShake .45s;
}

@keyframes gkShake {
	20%, 60% { transform: translateX(-4px); }
	40%, 80% { transform: translateX(4px); }
}

.gkChar.gkHintPulse .gkCap {
	animation: gkHint 1s ease-in-out 3;
}

@keyframes gkHint {
	50% { border-style: solid; border-color: var(--gkAccent); box-shadow: 0 0 0 3px var(--gkGlow), 0 0 28px var(--gkGlow); }
}

/* ---------- Loose keys ---------- */

.gkTrayWrap {
	position: relative;
	margin-top: 30px;
	padding-top: 14px;
	border-top: 1px solid var(--gkFaint);
}

#mainContent .gkTrayLabel {
	margin: 0 0 10px;
	font-family: var(--gkFont);
	font-size: 11px;
	letter-spacing: .16em;
	text-transform: uppercase;
	color: var(--gkSoft);
	text-align: center;
}

.gkTray {
	--c: clamp(44px, 9cqi, 56px);
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 10px;
	min-height: var(--c);
}

.gkChip {
	--u: calc(var(--c) * 1.1);
	--depth: 4px;
	position: relative;
	width: var(--c);
	height: var(--c);
	margin: 0;
	padding: 0;
	border: 0;
	background: none;
	color: var(--gkCapInk);
	font: inherit;
	cursor: grab;
	touch-action: none;
	animation: gkDrop .5s cubic-bezier(.2,1.4,.4,1) both;
	animation-delay: var(--d, 0ms);
}

@keyframes gkDrop {
	from { opacity: 0; transform: translateY(-16px) scale(.8); }
}

.gkChip .gkCap {
	box-shadow: 0 var(--depth) 0 var(--gkCapEdge), 0 0 12px var(--gkFaint);
	border-color: var(--gkLine);
}

.gkChip:hover .gkCap {
	transform: translateY(-7px);
	box-shadow: 0 8px 0 var(--gkCapEdge), 0 0 18px var(--gkGlow);
}

.gkChip[aria-pressed="true"] .gkCap {
	transform: translateY(-9px);
	border-color: var(--gkAccent);
	background: color-mix(in srgb, var(--gkAccent) 18%, var(--gkCap));
	box-shadow: 0 10px 0 color-mix(in srgb, var(--gkAccent) 50%, var(--gkCapEdge)), 0 0 0 2px var(--gkGlow), 0 0 22px var(--gkGlow);
}

.gkChip.gkLifted {
	opacity: .25;
}

.gkChip.gkGhost {
	position: fixed;
	left: 0;
	top: 0;
	z-index: 10000;
	pointer-events: none;
	animation: none;
	cursor: grabbing;
	/* The theme variables still apply, since this lives on the page root. */
	--gkAccent: var(--primary, #0798ff);
	--gkCap: #fff;
	--gkCapEdge: color-mix(in srgb, var(--gkAccent) 30%, #c9d1dc);
	--gkCapInk: #20262e;
	--gkLine: var(--gkAccent);
	--gkGlow: color-mix(in srgb, var(--gkAccent) 55%, transparent);
	--gkFont: var(--monoFonts, ui-monospace, monospace);
	--gkRadius: 7px;
}

html.theme_dark .gkChip.gkGhost {
	--gkCap: color-mix(in srgb, var(--gkAccent) 14%, #1c222c);
	--gkCapEdge: #05070b;
	--gkCapInk: #eef5ff;
}

.gkChip.gkGhost .gkCap {
	transform: rotate(-6deg) scale(1.12);
	box-shadow: 0 14px 0 var(--gkCapEdge), 0 18px 30px color-mix(in srgb, #000 30%, transparent), 0 0 24px var(--gkGlow);
}

/* ---------- Bursts and the finish ---------- */

.gkBurst {
	position: absolute;
	z-index: 5;
	width: 0;
	height: 0;
	pointer-events: none;
}

.gkBurst i {
	position: absolute;
	width: 6px;
	height: 6px;
	margin: -3px;
	border-radius: 1px;
	background: var(--gkAccent);
	box-shadow: 0 0 8px var(--gkGlow);
	animation: gkSpark .65s cubic-bezier(.1,.7,.3,1) forwards;
}

@keyframes gkSpark {
	to { transform: translate(var(--x), var(--y)) rotate(90deg) scale(.2); opacity: 0; }
}

.gkDone {
	position: absolute;
	inset: 0;
	z-index: 6;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 20px;
	background: color-mix(in srgb, var(--gkStageBottom) 55%, transparent);
	-webkit-backdrop-filter: blur(3px);
	backdrop-filter: blur(3px);
	animation: gkFade .4s both;
}

.gkDone[hidden] {
	display: none;
}

@keyframes gkFade {
	from { opacity: 0; }
}

.gkDoneCard {
	max-width: 440px;
	padding: 26px 30px;
	border: 1px solid var(--gkAccent);
	border-radius: 16px;
	background: var(--pageBackground, #fff);
	box-shadow: 0 0 0 6px var(--gkFaint), 0 20px 50px color-mix(in srgb, #000 25%, transparent), 0 0 40px var(--gkGlow);
	text-align: center;
	animation: gkPop .5s cubic-bezier(.2,1.5,.4,1) both;
}

@keyframes gkPop {
	from { transform: scale(.85) translateY(10px); opacity: 0; }
}

#mainContent .gkDoneKicker {
	margin: 0;
	font-family: var(--gkFont);
	font-size: 12px;
	letter-spacing: .18em;
	text-transform: uppercase;
	color: var(--gkAccent);
}

#mainContent .gkDoneCard h3 {
	margin: 6px 0 10px;
	padding: 0;
	border: 0;
	font-size: 26px;
}

#mainContent .gkDoneCard p#gkDoneSummary {
	margin: 0 0 18px;
	font-size: 16px;
	line-height: 1.5;
}

.gkDoneActions {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 8px;
}

.gk.gkComplete .gkBoard {
	animation: gkGlowUp 1.6s ease-out;
}

@keyframes gkGlowUp {
	30% { box-shadow: 0 calc(var(--u) * .28) 0 var(--gkBoardEdge), 0 0 60px var(--gkGlow), 0 0 0 3px var(--gkAccent); }
}

#mainContent .gkHelp {
	max-width: 760px;
	margin: 14px auto 0;
	font-size: 14px;
	line-height: 1.5;
	text-align: center;
	color: var(--gkSoft);
}

/* ---------- Smaller screens ---------- */

@media (max-width: 1200px) {
	.gkIntro,
	.gkProse {
		max-width: 700px;
		padding: 0 10px;
	}
}

@media (max-width: 700px) {
	main#mainContent.gkPage {
		padding: 0 8px;
	}
	.gk {
		--gkTilt: 22deg;
	}
	.gkHud {
		justify-content: center;
	}
	.gkStage {
		padding: 26px 8px 18px;
	}
	.gkStats {
		gap: 14px;
	}
}

@media (prefers-reduced-motion: reduce) {
	.gk *,
	.gk *::before,
	.gk *::after {
		animation: none !important;
		transition: none !important;
	}
}