:root {
	color-scheme: dark;
	font-family: 'Press Start 2P', monospace;
	--c-bg: #020810;
	--c-primary: #30e8b0;
	--c-secondary: #e0a030;
	--c-tertiary: #4090e0;
	--c-danger: #e04040;
	--c-surface: #0a1828;
	--c-text: #c0d8e8;
	--c-glow: rgba(48, 232, 176, 0.6);
}

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body {
	background: var(--c-bg);
	margin: 0;
	padding: 0;
	overflow: hidden;
	width: 100vw;
	height: 100vh;
}

#game-wrapper {
	position: fixed;
	inset: 0;
	width: 100vw;
	height: 100vh;
	overflow: hidden;
}

#game {
	display: block;
	width: 100%;
	height: 100%;
	image-rendering: pixelated;
	image-rendering: crisp-edges;
}

#scanlines {
	position: fixed;
	inset: 0;
	background: repeating-linear-gradient(to bottom,
			transparent 0px,
			transparent 2px,
			rgba(0, 0, 0, 0.12) 2px,
			rgba(0, 0, 0, 0.12) 4px);
	pointer-events: none;
	z-index: 5;
}

#ui-overlay {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 10;
	pointer-events: none;
}

#hud {
	display: flex;
	justify-content: space-between;
	align-items: flex-start;
	padding: 12px 20px;
	background: linear-gradient(to bottom, rgba(0, 0, 0, 0.7) 0%, transparent 100%);
	gap: 12px;
	flex-wrap: wrap;
}

.hud__group {
	display: flex;
	flex-direction: column;
	gap: 2px;
}

.hud__group--lives {
	flex-direction: row;
	align-items: center;
	gap: 6px;
}

.hud__label {
	font-size: 8px;
	color: var(--c-tertiary);
	letter-spacing: 1px;
}

.hud__value {
	font-size: 11px;
	color: var(--c-primary);
	text-shadow: 0 0 6px var(--c-glow);
}

.hud__bar {
	width: 70px;
	height: 8px;
	background: var(--c-surface);
	border: 1px solid var(--c-tertiary);
	border-radius: 1px;
	overflow: hidden;
}

.hud__bar-fill {
	height: 100%;
	width: 100%;
	background: var(--c-primary);
	transition: width 0.3s, background-color 0.3s;
}

.hud__bar-fill--low {
	background: var(--c-danger);
	animation: pulse-bar 0.5s infinite alternate;
}

@keyframes pulse-bar {
	to {
		opacity: 0.5;
	}
}

.overlay {
	position: fixed;
	inset: 0;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	z-index: 20;
	background: rgba(2, 8, 16, 0.92);
}

.overlay--hidden {
	display: none;
}

.title__main {
	font-size: 42px;
	color: var(--c-primary);
	text-shadow:
		0 0 10px var(--c-glow),
		0 4px 0 #1a9070,
		0 6px 0 #106050;
	letter-spacing: 6px;
	line-height: 1;
}

.title__sub {
	font-size: 36px;
	color: var(--c-secondary);
	text-shadow:
		0 0 10px rgba(224, 160, 48, 0.6),
		0 3px 0 #a07020,
		0 5px 0 #705010;
	letter-spacing: 8px;
	line-height: 1;
	margin-top: 4px;
}

.title__tagline {
	font-size: 8px;
	color: var(--c-tertiary);
	letter-spacing: 4px;
	margin-top: 16px;
	animation: flicker 2s infinite;
}

@keyframes flicker {
	0%, 100% {
		opacity: 1;
	}

	92% {
		opacity: 1;
	}

	93% {
		opacity: 0.3;
	}

	94% {
		opacity: 1;
	}

	96% {
		opacity: 0.5;
	}

	97% {
		opacity: 1;
	}
}

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

.title__instructions p {
	font-size: 7px;
	color: var(--c-text);
	margin: 6px 0;
	letter-spacing: 1px;
}

.title__instructions kbd {
	display: inline-block;
	background: var(--c-surface);
	border: 1px solid var(--c-primary);
	border-radius: 2px;
	padding: 2px 5px;
	font-family: inherit;
	font-size: 7px;
	color: var(--c-primary);
}

.btn--start {
	margin-top: 30px;
	font-family: inherit;
	font-size: 12px;
	color: var(--c-bg);
	background: var(--c-primary);
	border: none;
	padding: 10px 24px;
	cursor: pointer;
	letter-spacing: 2px;
	animation: btn-glow 1.5s infinite alternate;
	transition: transform 0.1s;
}

.btn--start:hover {
	transform: scale(1.05);
}

.btn--start:active {
	transform: scale(0.95);
}

@keyframes btn-glow {
	from {
		box-shadow: 0 0 8px var(--c-glow);
	}

	to {
		box-shadow: 0 0 20px var(--c-glow), 0 0 40px rgba(48, 232, 176, 0.3);
	}
}

.title__credit {
	margin-top: 24px;
	font-size: 5px;
	color: #445;
	letter-spacing: 2px;
}

.gameover__title {
	font-size: 24px;
	color: var(--c-danger);
	text-shadow: 0 0 15px rgba(224, 64, 64, 0.6);
	letter-spacing: 3px;
	animation: shake-text 0.3s infinite;
}

@keyframes shake-text {
	0%, 100% {
		transform: translateX(0);
	}

	25% {
		transform: translateX(-2px);
	}

	75% {
		transform: translateX(2px);
	}
}

.gameover__score,
.gameover__depth {
	font-size: 10px;
	color: var(--c-text);
	margin-top: 16px;
	letter-spacing: 2px;
}

.banner__era {
	font-size: 20px;
	color: var(--c-primary);
	text-shadow: 0 0 15px var(--c-glow);
	letter-spacing: 4px;
	animation: banner-in 0.5s ease-out;
}

.banner__depth {
	font-size: 9px;
	color: var(--c-tertiary);
	margin-top: 8px;
	letter-spacing: 2px;
}

@keyframes banner-in {
	from {
		transform: scale(3);
		opacity: 0;
	}

	to {
		transform: scale(1);
		opacity: 1;
	}
}