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

body {
	font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
	background: linear-gradient(135deg, #0f3460, #1a1a2e, #16213e);
	color: #fff;
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	padding: 20px;
	overflow-x: hidden;
	text-align: center;
}

#game-container {
	position: relative;
	width: 100%;
	max-width: 500px;
	margin: 0 auto;
}

#pixi-container {
	width: 100%;
	height: 100%;
	min-height: 400px;
	background: rgba(22, 33, 62, 0.85);
	border-radius: 16px;
	box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), inset 0 0 20px rgba(0, 30, 80, 0.7);
	overflow: hidden;
	position: relative;
	border: 2px solid rgba(255, 255, 255, 0.1);
}

.header {
	text-align: center;
	margin-bottom: 25px;
	width: 100%;
	padding: 0 15px;
}

h1 {
	font-size: 3.5rem;
	margin-bottom: 8px;
	background: linear-gradient(45deg, #ff6584, #ff9e6d, #ffd166);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
	text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
	letter-spacing: -1px;
	font-weight: 800;
	position: relative;
	display: inline-block;
}

h1::after {
	content: "2048";
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: linear-gradient(45deg, #ff6584, #ff9e6d, #ffd166);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
	opacity: 0.2;
	z-index: -1;
	transform: scale(1.05, 1.07);
}

.score-container {
	display: flex;
	justify-content: space-between;
	margin-top: 15px;
	background: rgba(30, 40, 70, 0.8);
	border-radius: 12px;
	padding: 12px 20px;
	max-width: 400px;
	margin-left: auto;
	margin-right: auto;
	box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
	font-weight: 600;
}

.score-box {
	text-align: center;
	min-width: 80px;
}

.score-label {
	font-size: 0.85rem;
	color: #a0a0c0;
	display: block;
	margin-bottom: 4px;
}

.score-value {
	font-size: 1.5rem;
	color: white;
	font-weight: 700;
}

.controls {
	display: flex;
	justify-content: center;
	gap: 15px;
	margin-top: 25px;
	flex-wrap: wrap;
}

.btn {
	background: linear-gradient(45deg, #16213e, #0f3460);
	color: white;
	border: none;
	padding: 14px 28px;
	font-size: 1.1rem;
	border-radius: 50px;
	cursor: pointer;
	transition: all 0.3s ease;
	box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.15);
	font-weight: 600;
	letter-spacing: 0.5px;
	display: flex;
	align-items: center;
	gap: 8px;
	min-width: 120px;
	justify-content: center;
}

.btn:hover {
	transform: translateY(-2px);
	box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.btn:active {
	transform: translateY(1px);
	box-shadow: 0 2px 10px rgba(0, 0, 0, 0.35);
}

.btn-undo {
	background: linear-gradient(45deg, #4a4e69, #22223b);
}

.btn-restart {
	background: linear-gradient(45deg, #ff6584, #ff5252);
}

.btn:disabled {
	opacity: 0.6;
	cursor: not-allowed;
	transform: none;
}

.instructions {
	margin-top: 25px;
	background: rgba(30, 40, 70, 0.7);
	border-radius: 16px;
	padding: 15px;
	max-width: 500px;
	font-size: 0.95rem;
	line-height: 1.5;
	box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.instructions p {
	margin-bottom: 8px;
}

.instructions strong {
	color: #ffd166;
}

.game-over,
.game-won {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: rgba(0, 15, 45, 0.92);
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	z-index: 100;
	border-radius: 16px;
	opacity: 0;
	pointer-events: none;
	transition: opacity 0.4s ease;
}

.game-over.show,
.game-won.show {
	opacity: 1;
	pointer-events: all;
}

.game-over h2,
.game-won h2 {
	font-size: 4rem;
	margin-bottom: 20px;
	background: linear-gradient(45deg, #ff6584, #ff5252);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
	text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.game-won h2 {
	background: linear-gradient(45deg, #ffd166, #ff9e6d);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
}

.game-over p,
.game-won p {
	font-size: 1.4rem;
	margin-bottom: 30px;
	max-width: 80%;
	text-align: center;
	color: #e0e0ff;
}

@media (max-width:550px) {
	h1 {
		font-size: 2.8rem;
	}

	.score-container {
		flex-direction: column;
		gap: 10px;
		padding: 15px;
	}

	.controls {
		flex-direction: column;
		align-items: center;
	}

	.btn {
		width: 100%;
		max-width: 250px;
		padding: 16px;
	}

	.instructions {
		font-size: 0.9rem;
		padding: 12px;
	}

	#pixi-container {
		min-height: 350px;
	}
}

@media (max-width:360px) {
	h1 {
		font-size: 2.5rem;
	}

	.game-over h2,
	.game-won h2 {
		font-size: 3.2rem;
	}

	.game-over p,
	.game-won p {
		font-size: 1.2rem;
	}
}

#installPrompt {
	position: fixed;
	bottom: 20px;
	left: 20px;
	right: 20px;
	background: rgba(30, 40, 70, 0.95);
	color: white;
	padding: 15px;
	border-radius: 16px;
	display: none;
	flex-direction: column;
	align-items: center;
	box-shadow: 0 5px 25px rgba(0, 0, 0, 0.4);
	z-index: 1000;
	border: 1px solid rgba(255, 255, 255, 0.1);
}

#installPrompt.show {
	display: flex;
}

#installPrompt p {
	margin-bottom: 12px;
	text-align: center;
	font-size: 0.95rem;
}

#installBtn {
	background: linear-gradient(45deg, #ff6584, #ff9e6d);
	color: white;
	border: none;
	padding: 10px 25px;
	border-radius: 50px;
	font-weight: 600;
	cursor: pointer;
	transition: all 0.3s ease;
}

#installBtn:hover {
	transform: scale(1.05);
	box-shadow: 0 4px 15px rgba(255, 101, 132, 0.4);
}

#error-container {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	background: rgba(0, 15, 45, 0.95);
	color: white;
	z-index: 1000;
	border-radius: 16px;
	padding: 20px;
}

#error-container h3 {
	color: #ff5252;
	margin-bottom: 15px;
	font-size: 1.8rem;
}

#error-container p {
	margin-bottom: 20px;
	max-width: 80%;
	text-align: center;
	line-height: 1.6;
}

#reload-btn {
	background: #ff5252;
	color: white;
	border: none;
	padding: 12px 30px;
	border-radius: 50px;
	font-size: 1.1rem;
	cursor: pointer;
}

#reload-btn:hover {
	background: #ff6584;
	transform: scale(1.05);
}