:root {
	/* Color Palette */
	--bg-primary: #0f172a;
	--bg-secondary: #1e293b;
	--bg-tertiary: #334155;
	--bg-quaternary: #475569;
	
	--text-primary: #f8fafc;
	--text-secondary: #f1f5f9;
	--text-muted: #e2e8f0;
	--text-subtle: #cbd5e1;
	
	--border-primary: #475569;
	--border-secondary: #64748b;
	--border-tertiary: #334155;
	
	--accent-primary: #3b82f6;
	--accent-secondary: #1d4ed8;
	--accent-tertiary: #2563eb;
	--accent-quaternary: #1e40af;
	
	--white: #ffffff;
	--black: #000000;
	
	/* Opacity variants */
	--bg-primary-85: rgba(15, 23, 42, 0.85);
	--bg-secondary-20: rgba(30, 41, 59, 0.2);
	--border-secondary-20: rgba(148, 163, 184, 0.2);
	--border-secondary-30: rgba(148, 163, 184, 0.3);
	--accent-primary-20: rgba(59, 130, 246, 0.2);
	--accent-primary-30: rgba(59, 130, 246, 0.3);
	--accent-primary-40: rgba(59, 130, 246, 0.4);
	--black-10: rgba(0, 0, 0, 0.1);
	--black-15: rgba(0, 0, 0, 0.15);
	--black-20: rgba(0, 0, 0, 0.2);
	--black-25: rgba(0, 0, 0, 0.25);
	--black-40: rgba(0, 0, 0, 0.4);
	--white-10: rgba(255, 255, 255, 0.1);
}

html, body { height: 100%; margin: 0; background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%); color: var(--text-primary); font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; }
#app { position: fixed; inset: 0; display: grid; grid-template-rows: 1fr auto; }
#renderer { position: relative; background: radial-gradient(ellipse at center, var(--bg-secondary) 0%, var(--bg-primary) 70%); }

#toolbar { position: relative; padding: 16px 0; }
#tray {
	margin: 0 auto;
	max-width: 1024px;
	background: var(--bg-primary-85);
	backdrop-filter: blur(16px) saturate(1.8);
	border: 1px solid var(--border-secondary-20);
	border-radius: 16px;
	padding: 14px 16px;
	display: grid;
	grid-template-columns: 1fr auto auto;
	gap: 16px;
	align-items: center;
	box-shadow: 0 8px 32px var(--black-40), 0 1px 2px var(--white-10) inset;
}

#tray .group { display: flex; align-items: center; gap: 14px; }
#tray .metrics { display: grid; grid-auto-flow: row; gap: 6px; font-size: 12px; color: var(--text-subtle); font-weight: 500; }
.toggle-switch {
	position: relative;
	display: inline-flex;
	align-items: center;
	gap: 10px;
	color: var(--text-secondary);
	font-weight: 500;
	cursor: pointer;
}
.toggle-switch input[type="checkbox"] {
	display: none;
}
.toggle-slider {
	width: 44px;
	height: 24px;
	background: linear-gradient(135deg, var(--bg-quaternary) 0%, var(--bg-tertiary) 100%);
	border-radius: 24px;
	position: relative;
	transition: all 0.3s ease;
	border: 1px solid var(--border-secondary);
	box-shadow: inset 0 2px 4px var(--black-10);
}
.toggle-slider::before {
	content: '';
	position: absolute;
	width: 18px;
	height: 18px;
	border-radius: 50%;
	background: linear-gradient(135deg, var(--text-muted) 0%, var(--text-subtle) 100%);
	top: 2px;
	left: 2px;
	transition: all 0.3s ease;
	box-shadow: 0 2px 4px var(--black-20);
}
.toggle-switch input:checked + .toggle-slider {
	background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
	border-color: var(--accent-tertiary);
	box-shadow: inset 0 2px 4px var(--black-10), 0 0 0 2px var(--accent-primary-20);
}
.toggle-switch input:checked + .toggle-slider::before {
	transform: translateX(20px);
	background: linear-gradient(135deg, var(--white) 0%, var(--text-primary) 100%);
}

.btn { 
	cursor: pointer; 
	border: 1px solid var(--border-primary); 
	background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%); 
	color: var(--text-primary); 
	padding: 8px 12px; 
	border-radius: 12px; 
	transition: all .2s ease; 
	font-weight: 500;
	box-shadow: 0 2px 4px var(--black-10);
}
.btn:hover { 
	background: linear-gradient(135deg, var(--bg-quaternary) 0%, var(--bg-tertiary) 100%); 
	border-color: var(--border-secondary);
	transform: translateY(-1px);
	box-shadow: 0 4px 8px var(--black-15);
}
.btn.active { 
	background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%); 
	border-color: var(--accent-tertiary); 
	box-shadow: 0 0 0 2px var(--accent-primary-30), 0 2px 8px var(--black-20);
}
.btn.active:hover { 
	background: linear-gradient(135deg, var(--accent-tertiary) 0%, var(--accent-quaternary) 100%); 
	border-color: var(--accent-secondary);
	transform: translateY(-1px);
	box-shadow: 0 0 0 2px var(--accent-primary-40), 0 4px 12px var(--black-25);
}
.btn:disabled { 
	opacity: .5; 
	cursor: not-allowed; 
	transform: none;
	box-shadow: 0 2px 4px var(--black-10);
}

#ptCount, #mem { 
	background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%); 
	color: var(--text-muted); 
	border-radius: 10px; 
	padding: 4px 10px; 
	border: 1px solid var(--border-tertiary);
	font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
}

.step-wrap { position: relative; display:flex; align-items:center; gap:10px; }
.label { font-size: 13px; color: var(--text-secondary); font-weight: 600; }
.select { 
	appearance: none; 
	background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%); 
	color: var(--text-primary); 
	border: 1px solid var(--border-primary); 
	border-radius: 12px; 
	padding: 8px 12px; 
	font-weight: 500;
	cursor: pointer;
	transition: all .2s ease;
	box-shadow: 0 2px 4px var(--black-10);
}
.select:hover {
	border-color: var(--border-secondary);
	box-shadow: 0 4px 8px var(--black-15);
}
.select:focus {
	outline: none;
	border-color: var(--accent-primary);
	box-shadow: 0 0 0 2px var(--accent-primary-30);
}
.select option {
	background: var(--bg-secondary);
	color: var(--text-primary);
	padding: 8px;
}

#spinner { width: 18px; height: 18px; border-radius: 999px; border: 2px solid var(--border-secondary-30); border-top-color: var(--accent-primary); animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Texture Selector Styles */
.texture-selector {
	position: absolute;
	top: 16px;
	left: 16px;
	z-index: 1000;
	background: var(--bg-primary-85);
	backdrop-filter: blur(16px) saturate(1.8);
	border: 1px solid var(--border-secondary-20);
	border-radius: 12px;
	padding: 8px 12px;
	box-shadow: 0 8px 32px var(--black-40), 0 1px 2px var(--white-10) inset;
}

.texture-selector .select {
	min-width: 160px;
	font-size: 13px;
	background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
	color: var(--text-muted);
	border-radius: 10px;
	padding: 4px 10px;
	border: 1px solid var(--border-tertiary);
	font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
	font-weight: 500;
}

.texture-selector .select:hover {
	border-color: var(--border-secondary);
	box-shadow: 0 2px 4px var(--black-10);
}

.texture-selector .select:focus {
	outline: none;
	border-color: var(--accent-primary);
	box-shadow: 0 0 0 2px var(--accent-primary-30);
}

.texture-selector .select option {
	background: var(--bg-secondary);
	color: var(--text-primary);
	padding: 8px;
}

.panel-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 20px 24px 16px;
	border-bottom: 1px solid var(--border-tertiary);
}

.panel-header h3 {
	margin: 0;
	font-size: 18px;
	font-weight: 600;
	color: var(--text-primary);
	letter-spacing: -0.025em;
}

.panel-toggle {
	background: var(--bg-tertiary);
	border: 1px solid var(--border-secondary);
	color: var(--text-muted);
	border-radius: 6px;
	padding: 8px 12px;
	cursor: pointer;
	transition: all 0.2s ease;
	font-size: 16px;
	line-height: 1;
}

.panel-toggle:hover {
	background: var(--bg-quaternary);
	color: var(--text-primary);
	border-color: var(--border-primary);
}

.view-options {
	flex: 1;
	overflow-y: auto;
	padding: 8px;
}

.view-option {
	display: flex;
	align-items: center;
	gap: 16px;
	padding: 12px 16px;
	margin-bottom: 8px;
	border-radius: 12px;
	cursor: pointer;
	transition: all 0.2s ease;
	border: 1px solid transparent;
	position: relative;
}

.view-option:hover {
	background: var(--bg-secondary-20);
	border-color: var(--border-secondary-20);
}

.view-option.active {
	background: var(--accent-primary-20);
	border-color: var(--accent-primary-30);
}

.view-option.active::before {
	content: '';
	position: absolute;
	left: 0;
	top: 50%;
	transform: translateY(-50%);
	width: 3px;
	height: 60%;
	background: var(--accent-primary);
	border-radius: 0 2px 2px 0;
}

.view-preview {
	width: 60px;
	height: 40px;
	border-radius: 8px;
	overflow: hidden;
	background: var(--bg-tertiary);
	border: 1px solid var(--border-tertiary);
	flex-shrink: 0;
}

.view-preview img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform 0.2s ease;
}

.view-option:hover .view-preview img {
	transform: scale(1.05);
}

.view-info {
	flex: 1;
	min-width: 0;
}

.view-info h4 {
	margin: 0 0 4px 0;
	font-size: 14px;
	font-weight: 600;
	color: var(--text-primary);
	line-height: 1.3;
}

.view-info p {
	margin: 0;
	font-size: 12px;
	color: var(--text-subtle);
	line-height: 1.4;
}

.view-option.active .view-info h4 {
	color: var(--accent-primary);
}

.view-option.active .view-info p {
	color: var(--text-muted);
}

@media (max-width: 800px) {
	#tray { grid-template-columns: 1fr; row-gap: 12px; padding: 12px; }
	.btn { padding: 6px 10px; }
	
	.view-panel {
		width: 280px;
	}
	
	.view-panel.collapsed {
		transform: translateX(-240px);
	}
}