/* ==============================
   CSS Custom Properties
   ============================== */
:root {
	--color-bg: #0f172a;
	--color-bg-splash: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
	--color-surface: rgba(255, 255, 255, 0.06);
	--color-surface-hover: rgba(255, 255, 255, 0.12);
	--color-text: #f1f5f9;
	--color-text-muted: #94a3b8;
	--color-accent: #38bdf8;
	--color-accent-hover: #7dd3fc;
	--color-heart: #f43f5e;
	--color-error: #ef4444;
	--font-family: 'Inter', system-ui, -apple-system, sans-serif;
	--radius: 12px;
	--radius-sm: 8px;
	--transition: 0.2s ease;
}

/* ==============================
   Reset & Base
   ============================== */
*, *::before, *::after {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body {
	font-family: var(--font-family);
	font-size: 15px;
	line-height: 1.6;
	color: var(--color-text);
	background: var(--color-bg);
	overscroll-behavior: none;
	overflow: hidden;
	-webkit-tap-highlight-color: transparent;
}

a {
	color: var(--color-accent);
	text-decoration: none;
	font-weight: 500;
	transition: color var(--transition);
}

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

button {
	cursor: pointer;
	font-family: var(--font-family);
	border: none;
	background: none;
}

/* ==============================
   Utility
   ============================== */
.show {
	display: block;
}

.none {
	display: none !important;
}

/* ==============================
   Splash / Loading Screen
   ============================== */
#play {
	position: fixed;
	inset: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	background: var(--color-bg-splash);
	z-index: 100;
}

.splash-card {
	text-align: center;
	max-width: 460px;
	width: 90%;
	padding: 40px 32px;
	background: var(--color-surface);
	border: 1px solid rgba(255, 255, 255, 0.08);
	border-radius: var(--radius);
	backdrop-filter: blur(20px);
}

.splash-logo {
	width: 72px;
	height: 72px;
	border-radius: 50%;
	object-fit: cover;
	margin-bottom: 16px;
	box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.3);
}

.splash-title {
	font-size: 28px;
	font-weight: 700;
	letter-spacing: -0.02em;
	margin-bottom: 4px;
}

.splash-subtitle {
	color: var(--color-text-muted);
	font-size: 16px;
	margin-bottom: 28px;
}

.splash-instructions {
	text-align: left;
	background: rgba(0, 0, 0, 0.25);
	border-radius: var(--radius-sm);
	padding: 16px 20px;
	margin-bottom: 24px;
}

.instruction-row {
	display: flex;
	align-items: center;
	gap: 14px;
	font-size: 14px;
	color: var(--color-text-muted);
}

.instruction-row + .instruction-row {
	margin-top: 10px;
}

.key-group {
	display: flex;
	gap: 4px;
	flex-shrink: 0;
}

kbd {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-width: 30px;
	height: 30px;
	padding: 0 8px;
	background: rgba(255, 255, 255, 0.1);
	border: 1px solid rgba(255, 255, 255, 0.15);
	border-radius: 6px;
	font-family: var(--font-family);
	font-size: 13px;
	font-weight: 600;
	color: var(--color-text);
}

.icon-mouse {
	font-size: 24px;
	line-height: 1;
	color: var(--color-text);
}

.splash-audio-note {
	font-size: 13px;
	color: var(--color-text-muted);
	margin-bottom: 20px;
}

/* --- Progress bar --- */
.loading-label {
	font-size: 14px;
	color: var(--color-text-muted);
	margin-bottom: 10px;
}

.progress-bar {
	width: 100%;
	height: 6px;
	background: rgba(255, 255, 255, 0.08);
	border-radius: 3px;
	overflow: hidden;
	margin-bottom: 6px;
}

.progress-fill {
	height: 100%;
	width: 0%;
	background: var(--color-accent);
	border-radius: 3px;
	transition: width 0.3s ease;
}

.loading-percent {
	font-size: 13px;
	color: var(--color-text-muted);
	font-variant-numeric: tabular-nums;
}

/* --- Error --- */
.error-text {
	color: var(--color-error);
	font-size: 14px;
	padding: 12px;
	background: rgba(239, 68, 68, 0.1);
	border-radius: var(--radius-sm);
	border: 1px solid rgba(239, 68, 68, 0.25);
}

/* --- Play button --- */
.btn-play {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 14px 48px;
	margin-top: 20px;
	font-size: 16px;
	font-weight: 600;
	letter-spacing: 0.04em;
	text-transform: uppercase;
	color: var(--color-bg);
	background: var(--color-accent);
	border-radius: var(--radius-sm);
	transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
	box-shadow: 0 4px 24px rgba(56, 189, 248, 0.25);
}

.btn-play:hover {
	background: var(--color-accent-hover);
	transform: translateY(-1px);
	box-shadow: 0 6px 32px rgba(56, 189, 248, 0.35);
}

.btn-play:active {
	transform: translateY(0);
	box-shadow: 0 2px 12px rgba(56, 189, 248, 0.2);
}

.splash-links {
	margin-top: 20px;
	font-size: 14px;
}

/* ==============================
   3D Experience (Main)
   ============================== */
#main {
	position: fixed;
	inset: 0;
}

#container {
	width: 100%;
	height: 100%;
}

#container canvas {
	display: block;
}

/* ==============================
   HUD (top-right controls)
   ============================== */
#hud {
	position: absolute;
	top: 16px;
	right: 16px;
	display: flex;
	gap: 8px;
	align-items: flex-start;
	z-index: 10;
}

.hud-btn {
	width: 40px;
	height: 40px;
	display: flex;
	align-items: center;
	justify-content: center;
	background: rgba(0, 0, 0, 0.5);
	backdrop-filter: blur(8px);
	border: 1px solid rgba(255, 255, 255, 0.12);
	border-radius: var(--radius-sm);
	color: var(--color-text);
	font-size: 18px;
	transition: background var(--transition);
	user-select: none;
	-webkit-user-select: none;
}

.hud-btn:hover {
	background: rgba(0, 0, 0, 0.7);
}

#help-tooltip {
	position: absolute;
	top: 48px;
	right: 0;
	background: rgba(0, 0, 0, 0.85);
	backdrop-filter: blur(12px);
	border: 1px solid rgba(255, 255, 255, 0.1);
	border-radius: var(--radius-sm);
	padding: 14px 18px;
	font-size: 13px;
	line-height: 1.7;
	color: var(--color-text-muted);
	white-space: nowrap;
	z-index: 11;
}

/* ==============================
   Bottom Info Bar
   ============================== */
#info {
	position: absolute;
	bottom: 0;
	left: 0;
	right: 0;
	text-align: center;
	padding: 10px 16px;
	background: linear-gradient(transparent, rgba(0, 0, 0, 0.6));
	color: rgba(255, 255, 255, 0.7);
	font-size: 13px;
	pointer-events: none;
	user-select: none;
	-webkit-user-select: none;
	z-index: 5;
}

#info a {
	pointer-events: auto;
	color: var(--color-accent);
}

.sep {
	margin: 0 8px;
	opacity: 0.4;
}

.heart {
	color: var(--color-heart);
	font-size: 1.1em;
}

/* ==============================
   Mobile Joystick
   ============================== */
#joystick-container {
	position: absolute;
	bottom: 0;
	left: 0;
	right: 0;
	height: 200px;
	pointer-events: none;
	z-index: 10;
}

.joystick {
	position: absolute;
	bottom: 36px;
	width: 120px;
	height: 120px;
	border-radius: 50%;
	background: rgba(255, 255, 255, 0.08);
	border: 2px solid rgba(255, 255, 255, 0.15);
	pointer-events: auto;
	touch-action: none;
	display: flex;
	align-items: center;
	justify-content: center;
}

#joystick-move {
	left: 32px;
}

.joystick-knob {
	width: 48px;
	height: 48px;
	border-radius: 50%;
	background: rgba(255, 255, 255, 0.25);
	border: 2px solid rgba(255, 255, 255, 0.3);
	transition: transform 0.05s ease-out;
	pointer-events: none;
}

/* ==============================
   Responsive
   ============================== */
@media (max-width: 480px) {
	.splash-card {
		padding: 28px 20px;
	}

	.splash-title {
		font-size: 22px;
	}

	.splash-subtitle {
		font-size: 14px;
	}

	.splash-instructions {
		padding: 12px 14px;
	}

	.btn-play {
		padding: 12px 36px;
		font-size: 15px;
	}

	#info {
		font-size: 11px;
		padding: 8px 12px;
	}

	.joystick {
		width: 100px;
		height: 100px;
		bottom: 28px;
	}

	#joystick-move {
		left: 20px;
	}

	.joystick-knob {
		width: 40px;
		height: 40px;
	}
}

@media (min-width: 481px) and (max-width: 768px) {
	.splash-card {
		padding: 32px 24px;
	}

	.joystick {
		width: 110px;
		height: 110px;
	}
}

@media (max-height: 500px) {
	.splash-card {
		padding: 16px 20px;
	}

	.splash-logo {
		width: 48px;
		height: 48px;
		margin-bottom: 8px;
	}

	.splash-title {
		font-size: 20px;
	}

	.splash-subtitle {
		margin-bottom: 12px;
	}

	.splash-instructions {
		padding: 10px 14px;
		margin-bottom: 12px;
	}
}