:root {
	/* 使用项目主配色方案 */
	--bg-primary: #110011;
	--bg-secondary: #221122;
	--bg-tertiary: #2d1a2d;
	--bg-elevated: #3a2a3a;
	
	--text-primary: rgb(230, 237, 243);
	--text-secondary: rgb(150, 157, 163);
	--text-highlight: #ddb784;
	
	--brand-primary: #e75624;
	--brand-light: #ff7a47;
	--brand-dark: #b33a12;
	
	--focus-color: #f97d1a;
	
	--border-subtle: rgba(230, 237, 243, 0.06);
	--border-medium: rgba(230, 237, 243, 0.12);
	
	--shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
	--shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
	--shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.6);
}

/* Styles scoped only to the generator's <main class="generator"> */
main.generator .container {
	width: 100%;
	max-width: 1100px;
	background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
	border-radius: 16px;
	padding: 32px;
	margin: 0 auto;
	box-shadow: var(--shadow-lg);
	color: var(--text-primary);
	border: 1px solid var(--border-subtle);
}

main.generator .hero h1 {
	margin: 0;
	font-size: 2rem;
	color: var(--text-primary);
	font-weight: 600;
	letter-spacing: -0.02em;
}

main.generator .lead {
	color: var(--text-secondary);
	margin-top: 8px;
	font-size: 1.05rem;
}

main.generator .controls {
	display: flex;
	flex-direction: column;
	gap: 20px;
	margin-top: 24px;
}

main.generator .file-label {
	display: inline-block;
	padding: 12px 20px;
	background: transparent;
	border: 2px solid var(--brand-primary);
	border-radius: 10px;
	cursor: pointer;
	color: var(--brand-primary);
	width: max-content;
	transition: all 0.2s ease;
	font-weight: 500;
}

main.generator .file-label:hover {
	background: rgba(231, 86, 36, 0.1);
	border-color: var(--brand-light);
	color: var(--brand-light);
	transform: translateY(-2px);
	box-shadow: var(--shadow-sm);
}

/* hide native file input */
main.generator input[type="file"] {
	position: absolute !important;
	left: -9999px;
	width: 1px;
	height: 1px;
	overflow: hidden;
}

/* format toggle buttons */
.format-selector {
	display: flex;
	flex-direction: column;
	gap: 10px;
}

.format-selector label {
	color: var(--text-primary);
	font-weight: 500;
	font-size: 0.95rem;
}

.format-toggle {
	width: 100%;
	display: grid;
	grid-template-columns: 1fr 1fr 1fr;
	background: var(--bg-tertiary);
	padding: 4px;
	border-radius: 10px;
	border: 1px solid var(--border-subtle);
	gap: 4px;
}

.format-btn {
	background: transparent;
	border: 0;
	color: var(--text-secondary);
	padding: 10px 14px;
	border-radius: 8px;
	cursor: pointer;
	font-weight: 600;
	transition: all 0.2s ease;
}

.format-btn.active {
	background: var(--brand-primary);
	color: white;
	box-shadow: 0 4px 12px rgba(231, 86, 36, 0.3);
}

.format-btn:not(.active):hover {
	background: var(--bg-elevated);
	color: var(--text-primary);
}

/* disabled/unsupported state */
.format-btn.disabled,
.format-btn[disabled] {
	opacity: 0.4;
	cursor: not-allowed;
	filter: grayscale(0.3);
}

/* Upload preview */
main.generator .upload-preview {
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 12px;
	border-radius: 12px;
	background: var(--bg-tertiary);
	border: 2px dashed var(--border-medium);
	width: 360px;
	aspect-ratio: 16 / 9;
	position: relative;
	align-self: flex-end;
	overflow: hidden;
	transition: border-color 0.2s ease;
}

main.generator .upload-preview:hover {
	border-color: var(--brand-primary);
}

main.generator .upload-preview::after {
	content: "No image selected";
	color: var(--text-secondary);
	font-size: 0.95rem;
	position: absolute;
	pointer-events: none;
	left: 50%;
	top: 50%;
	transform: translate(-50%, -50%);
}

main.generator .upload-preview.img-loaded::after {
	display: none;
}

main.generator .upload-preview img {
	width: 100%;
	height: 100%;
	object-fit: contain;
	border-radius: 8px;
	box-shadow: var(--shadow-md);
	opacity: 0;
	transition: opacity 0.3s ease;
}

main.generator .upload-preview img.loaded {
	opacity: 1;
}

/* Preview grid */
main.generator .preview-grid {
	display: grid;
	grid-template-columns: minmax(160px, 57.5%) 42.5%;
	gap: 12px;
	margin-top: 12px;
	align-items: stretch;
}

main.generator .preview-grid > .preview-item:first-child {
	grid-column: 1 / 2;
	grid-row: 1 / 4;
}

main.generator .preview-item {
	background: var(--bg-tertiary);
	padding: 12px;
	border-radius: 12px;
	text-align: center;
	border: 1px solid var(--border-subtle);
	box-shadow: var(--shadow-sm);
	position: relative;
	min-height: 120px;
	display: flex;
	flex-direction: column;
	transition: transform 0.2s ease, box-shadow 0.2s ease;
}

main.generator .preview-item:hover {
	transform: translateY(-2px);
	box-shadow: var(--shadow-md);
	border-color: var(--border-medium);
}

main.generator .preview-item h3 {
	margin: 0 0 10px 0;
	font-size: 1.05rem;
	color: var(--text-primary);
	font-weight: 600;
}

main.generator .preview-item::after {
	content: "No preview";
	color: var(--text-secondary);
	position: absolute;
	left: 0;
	right: 0;
	top: 50%;
	transform: translateY(-50%);
	text-align: center;
	font-size: 0.9rem;
}

main.generator .preview-item.img-loaded::after {
	display: none;
}

.preview-media {
	flex: 1 1 auto;
	display: block;
	overflow: hidden;
	border-radius: 8px;
	background: var(--bg-primary);
}

main.generator .preview-item img {
	width: 100%;
	object-fit: contain;
	display: block;
	border-radius: 8px;
	background: var(--bg-primary);
	opacity: 0;
	transition: opacity 0.3s ease;
}

main.generator .preview-item img.loaded {
	opacity: 1;
}

main.generator .preview-item .download-btn {
	margin-top: 10px;
	flex: 0 0 auto;
}

/* Responsive: stack vertically on small screens */
@media (max-width: 800px) {
	main.generator .preview-grid {
		grid-template-columns: 1fr;
		grid-template-rows: none;
	}
	main.generator .preview-grid > .preview-item:first-child {
		grid-row: auto;
		grid-column: auto;
	}
	main.generator .preview-item {
		min-height: 160px;
	}
}

/* Controls row */
main.generator .controls-row {
	display: flex;
	gap: 20px;
	align-items: start;
	margin-top: 16px;
}

main.generator .upload-right {
	flex: 0 0 45%;
	display: flex;
	flex-direction: column;
	gap: 14px;
	align-items: flex-end;
}

main.generator .upload-left {
	flex: 1 1 55%;
	display: flex;
	align-items: center;
	justify-content: center;
}

@media (max-width: 800px) {
	main.generator .controls-row {
		flex-direction: column;
	}
	main.generator .upload-left,
	main.generator .upload-right {
		flex: auto;
	}
	main.generator .upload-left {
		width: 100%;
	}
	main.generator .upload-right {
		width: 100%;
		justify-content: center;
		align-items: center;
	}
}

/* Download buttons */
main.generator .download-btn {
	margin: 8px;
	padding: 8px 12px;
	background: rgba(231, 86, 36, 0.1);
	color: var(--brand-primary);
	border: 1px solid rgba(231, 86, 36, 0.3);
	border-radius: 8px;
	cursor: pointer;
	font-size: 0.9rem;
	font-weight: 500;
	align-self: stretch;
	transition: all 0.2s ease;
}

main.generator .download-btn:hover {
	transform: translateY(-2px);
	box-shadow: 0 6px 16px rgba(231, 86, 36, 0.25);
	background: rgba(231, 86, 36, 0.15);
	border-color: var(--brand-primary);
	color: var(--brand-light);
}

main.generator .download-btn:active {
	transform: translateY(0);
}

main.generator .download-btn:focus {
	outline: 2px solid var(--focus-color);
	outline-offset: 2px;
}

/* Action buttons */
main.generator .actions {
	display: flex;
	gap: 12px;
	margin-top: 12px;
	justify-content: flex-end;
}

main.generator .btn-primary {
	background: var(--brand-primary);
	color: white;
	border: none;
	padding: 12px 20px;
	border-radius: 10px;
	cursor: pointer;
	font-weight: 600;
	box-shadow: 0 4px 12px rgba(231, 86, 36, 0.3);
	transition: all 0.2s ease;
}

main.generator .btn-primary:hover {
	transform: translateY(-2px);
	box-shadow: 0 6px 20px rgba(231, 86, 36, 0.4);
	background: var(--brand-light);
}

main.generator .btn-primary:active {
	transform: translateY(0);
}

main.generator .btn-primary:focus {
	outline: 2px solid var(--focus-color);
	outline-offset: 2px;
}

/* Toolbar */
.toolbar {
	display: flex;
	align-items: center;
	gap: 12px;
	padding: 8px 12px;
	background: var(--bg-tertiary);
	border-radius: 10px;
	border: 1px solid var(--border-subtle);
}

.toolbar span {
	color: var(--text-highlight);
	font-weight: 600;
	font-size: 1rem;
	min-width: 80px;
	text-align: center;
}

.toolbar button {
	padding: 6px 12px !important;
	font-size: 0.9rem !important;
}

/* Region bar */
.region-bar {
	display: grid;
	grid-template-columns: 1fr 1fr 1fr;
	gap: 8px;
	margin-bottom: 12px;
}

@media (max-width: 800px) {
	.region-bar {
		grid-template-columns: 1fr 1fr;
	}
}

.region-bar button.active {
	background: var(--brand-primary) !important;
	border-color: var(--brand-primary) !important;
	color: white !important;
}

.region-bar button {
	background: transparent !important;
	border: 1px solid var(--brand-primary) !important;
	color: var(--brand-primary) !important;
	padding: 8px 12px !important;
	font-size: 0.85rem !important;
	transition: all 0.2s ease;
}

.region-bar button:hover:not(.active) {
	background: rgba(231, 86, 36, 0.1) !important;
	color: var(--brand-light) !important;
}

/* Thanks note */
.thanks-note {
	margin-top: 32px;
	padding: 20px;
	background: var(--bg-tertiary);
	border-radius: 12px;
	border: 1px solid var(--border-subtle);
	text-align: center;
}

.thanks-note h3 {
	margin: 0 0 12px 0;
	color: var(--text-primary);
	font-size: 1.1rem;
	font-weight: 600;
}

.thanks-links {
	display: flex;
	justify-content: center;
	gap: 16px;
	flex-wrap: wrap;
}

.thanks-links a {
	color: var(--brand-primary);
	text-decoration: none;
	font-weight: 500;
	transition: color 0.2s ease;
}

.thanks-links a:hover {
	color: var(--brand-light);
	text-decoration: underline;
}

/* Accessibility */
main.generator .visually-hidden {
	position: absolute !important;
	height: 1px;
	width: 1px;
	overflow: hidden;
	clip: rect(1px, 1px, 1px, 1px);
	white-space: nowrap;
}

/* Mobile optimizations */
@media (max-width: 800px) {
	main.generator .container {
		padding: 20px;
		width: auto;
	}
	main.generator .hero h1 {
		font-size: 1.5rem;
	}
	main.generator .preview-item img {
		height: 120px;
	}
	main.generator .upload-preview {
		max-width: 100%;
		margin: 0 auto;
	}
	main.generator .actions {
		justify-content: center;
		width: 100%;
	}
	.toolbar {
		flex-direction: column;
		gap: 8px;
	}
	.toolbar span {
		min-width: auto;
	}
}

.upload-preview {
	max-width: 100%;
}

/* Utility class to hide elements */
.hidden {
	display: none !important;
}