/* Modern CSS Reset */
* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

/* Root Variables */
:root {
	--primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
	--secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
	--accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
	--success-gradient: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
	--glass-bg: rgba(255, 255, 255, 0.1);
	--glass-border: rgba(255, 255, 255, 0.2);
	--text-primary: #2d3748;
	--text-secondary: #4a5568;
	--text-light: rgba(255, 255, 255, 0.9);
	--shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
	--shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
	--shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.2);
	--border-radius: 12px;
	--transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Body & Base Styles */
body {
	font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
	background: var(--primary-gradient);
	height: 100vh;
	line-height: 1.5;
	color: var(--text-primary);
	overflow: hidden;
}

/* Animated Background */
body::before {
	content: '';
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: 
		radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
		radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
		radial-gradient(circle at 40% 80%, rgba(120, 219, 226, 0.3) 0%, transparent 50%);
	animation: float 20s ease-in-out infinite;
	z-index: -1;
}

@keyframes float {
	0%, 100% { transform: translateY(0px); }
	50% { transform: translateY(-20px); }
}

/* Container */
.container {
	height: 100vh;
	padding: 1rem;
	display: flex;
	flex-direction: column;
	position: relative;
	z-index: 1;
}

/* Header Styles */
.header {
	text-align: center;
	margin-bottom: 1rem;
	flex-shrink: 0;
}

.title {
	font-size: 2rem;
	font-weight: 700;
	margin: 0;
	letter-spacing: -0.02em;
}

.gradient-text {
	background: linear-gradient(135deg, #fff 0%, rgba(255, 255, 255, 0.8) 100%);
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	background-clip: text;
	text-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Main Layout - Two Columns */
.main-layout {
	display: grid;
	grid-template-columns: 350px 1fr;
	gap: 1rem;
	height: calc(100vh - 120px);
	overflow: hidden;
}

/* Left Panel */
.left-panel {
	display: flex;
	flex-direction: column;
	gap: 1rem;
	overflow-y: auto;
}

/* Upload Section */
.upload-section {
	flex-shrink: 0;
}

.upload-area {
	background: var(--glass-bg);
	backdrop-filter: blur(20px);
	border: 2px dashed var(--glass-border);
	border-radius: var(--border-radius);
	padding: 1.5rem 1rem;
	text-align: center;
	transition: var(--transition);
	position: relative;
	cursor: pointer;
	overflow: hidden;
}

.upload-area::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
	transform: translateX(-100%);
	transition: transform 0.6s;
}

.upload-area:hover::before {
	transform: translateX(100%);
}

.upload-area:hover {
	border-color: rgba(255, 255, 255, 0.4);
	background: rgba(255, 255, 255, 0.15);
	transform: translateY(-2px);
	box-shadow: var(--shadow-lg);
}

.upload-area.dragover {
	border-color: #4facfe;
	background: rgba(79, 172, 254, 0.1);
	transform: scale(1.02);
}

.upload-icon {
	color: var(--text-light);
	margin-bottom: 0.5rem;
	opacity: 0.8;
}

.upload-area h3 {
	color: var(--text-light);
	font-size: 1.1rem;
	font-weight: 600;
	margin-bottom: 0.25rem;
}

.upload-area p {
	color: var(--text-light);
	opacity: 0.8;
	font-size: 0.85rem;
}

#imageInput {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	opacity: 0;
	cursor: pointer;
}

/* Controls Section */
.controls-section {
	background: var(--glass-bg);
	backdrop-filter: blur(20px);
	border: 1px solid var(--glass-border);
	border-radius: var(--border-radius);
	padding: 1rem;
	box-shadow: var(--shadow-md);
	flex-shrink: 0;
}

.controls-grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 0.75rem;
	margin-bottom: 1rem;
}

.control-group {
	display: flex;
	flex-direction: column;
	gap: 0.25rem;
}

.control-label {
	display: flex;
	align-items: center;
	gap: 0.25rem;
	color: var(--text-light);
	font-weight: 500;
	font-size: 0.8rem;
}

.label-icon {
	font-size: 0.9rem;
}

.control-input {
	width: 100%;
	padding: 0.5rem 0.75rem;
	background: rgba(255, 255, 255, 0.1);
	border: 1px solid rgba(255, 255, 255, 0.2);
	border-radius: 8px;
	color: var(--text-light);
	font-size: 0.9rem;
	transition: var(--transition);
	backdrop-filter: blur(10px);
}

.control-input:focus {
	outline: none;
	border-color: #4facfe;
	background: rgba(255, 255, 255, 0.15);
	box-shadow: 0 0 0 2px rgba(79, 172, 254, 0.1);
}

/* Hide native number input arrows */
.control-input[type="number"]::-webkit-outer-spin-button,
.control-input[type="number"]::-webkit-inner-spin-button {
	-webkit-appearance: none;
	margin: 0;
}

.control-input[type="number"] {
	-moz-appearance: textfield;
}

/* Custom number input wrapper */
.number-input-wrapper {
	position: relative;
	display: flex;
	align-items: center;
}

/* Custom arrows container */
.custom-arrows {
	position: absolute;
	right: 8px;
	top: 50%;
	transform: translateY(-50%);
	display: flex;
	flex-direction: column;
	gap: 2px;
}

/* Custom arrow buttons */
.arrow-btn {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 24px;
	height: 20px;
	background: rgba(255, 255, 255, 0.2);
	border: 1px solid rgba(255, 255, 255, 0.3);
	border-radius: 4px;
	color: rgba(255, 255, 255, 0.9);
	cursor: pointer;
	transition: var(--transition);
	padding: 0;
}

.arrow-btn:hover {
	background: rgba(255, 255, 255, 0.3);
	border-color: rgba(255, 255, 255, 0.5);
	color: white;
	transform: scale(1.05);
}

.arrow-btn:active {
	background: rgba(255, 255, 255, 0.4);
	transform: scale(0.95);
}

/* Adjust input padding to make room for arrows */
.number-input-wrapper .control-input {
	padding-right: 40px;
}

/* Grid Preview Section */
.grid-preview-section {
	background: var(--glass-bg);
	backdrop-filter: blur(20px);
	border: 1px solid var(--glass-border);
	border-radius: var(--border-radius);
	padding: 1rem;
	box-shadow: var(--shadow-md);
	flex-shrink: 0;
}

.grid-preview-section .preview-header {
	background: none;
	backdrop-filter: none;
	border: none;
	border-radius: 0;
	padding: 0;
	margin: 0 0 0.75rem 0;
	box-shadow: none;
}

.grid-preview-section .preview-header h4 {
	color: var(--text-light);
	font-size: 0.9rem;
	font-weight: 600;
	margin: 0;
	opacity: 0.9;
}

.grid-preview-container {
	display: flex;
	justify-content: center;
	align-items: center;
	min-height: 120px;
}

.grid-preview {
	display: grid;
	gap: 2px;
	width: 100px;
	height: 100px;
	border: 2px solid rgba(255, 255, 255, 0.3);
	border-radius: 8px;
	padding: 4px;
	transition: var(--transition);
}

.grid-cell {
	background: rgba(255, 255, 255, 0.2);
	border-radius: 3px;
	position: relative;
	transition: var(--transition);
	overflow: hidden;
}

.grid-cell::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
	transform: translateX(-100%);
	transition: transform 0.8s;
}

.grid-preview:hover .grid-cell::before {
	transform: translateX(100%);
}

.grid-cell:hover {
	background: rgba(255, 255, 255, 0.3);
	transform: scale(0.95);
}

/* Animation for grid changes */
.grid-preview.updating {
	transform: scale(0.95);
	opacity: 0.7;
}

.grid-preview.updating .grid-cell {
	animation: fadeInCell 0.3s ease-out forwards;
}

@keyframes fadeInCell {
	0% {
		opacity: 0;
		transform: scale(0.8);
	}
	100% {
		opacity: 1;
		transform: scale(1);
	}
}

/* Split Button */
.split-button {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 0.5rem;
	width: 100%;
	padding: 0.75rem 1rem;
	background: var(--accent-gradient);
	border: none;
	border-radius: 8px;
	color: white;
	font-size: 0.9rem;
	font-weight: 600;
	cursor: pointer;
	transition: var(--transition);
	box-shadow: var(--shadow-md);
	text-transform: uppercase;
	letter-spacing: 0.5px;
}

.split-button:hover:not(:disabled) {
	transform: translateY(-2px);
	box-shadow: var(--shadow-lg);
}

.split-button:active {
	transform: translateY(0);
}

.split-button:disabled {
	background: rgba(255, 255, 255, 0.1);
	cursor: not-allowed;
	opacity: 0.5;
}

.button-icon {
	font-size: 1rem;
}

/* Info Panel */
.info-panel {
	background: var(--glass-bg);
	backdrop-filter: blur(20px);
	border: 1px solid var(--glass-border);
	border-radius: var(--border-radius);
	padding: 1rem;
	box-shadow: var(--shadow-md);
	flex-shrink: 0;
}

.info-item {
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: 0.25rem 0;
	color: var(--text-light);
	font-size: 0.85rem;
}

.info-label {
	opacity: 0.8;
}

/* Right Panel */
.right-panel {
	display: flex;
	flex-direction: column;
	overflow: hidden;
}

.preview-header {
	background: var(--glass-bg);
	backdrop-filter: blur(20px);
	border: 1px solid var(--glass-border);
	border-radius: var(--border-radius);
	padding: 0.75rem 1rem;
	margin-bottom: 1rem;
	flex-shrink: 0;
}

.preview-header h3 {
	color: var(--text-light);
	font-size: 1rem;
	font-weight: 600;
	margin: 0;
}

/* Images Container */
.images-container {
	flex: 1;
	overflow-y: auto;
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(600px, 1fr));
	row-gap: 0.5rem;
	column-gap: 0.75rem;
	padding-right: 0.5rem;
	align-items: start;
	grid-auto-rows: min-content;
}

.image-container {
	background: var(--glass-bg);
	backdrop-filter: blur(20px);
	border: 1px solid var(--glass-border);
	border-radius: var(--border-radius);
	padding: 1rem;
	box-shadow: var(--shadow-md);
	transition: var(--transition);
	width: 100%;
	min-width: 0;
}

.image-content {
	display: grid;
	grid-template-columns: 160px 1fr;
	gap: 0.75rem;
	align-items: start;
}

.image-preview-section {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 0.5rem;
}

.image-splits-section {
	display: flex;
	flex-direction: column;
	gap: 0.75rem;
}

.image-container:hover {
	transform: translateY(-2px);
	box-shadow: var(--shadow-lg);
}

/* Image Info */
.image-info {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 0.75rem;
	padding: 0.5rem;
	background: rgba(255, 255, 255, 0.05);
	border-radius: 6px;
	color: rgba(255, 255, 255, 0.9);
}

.image-info span:first-child {
	font-weight: 600;
	font-size: 0.85rem;
}

.image-info span:last-child {
	font-size: 0.75rem;
	opacity: 0.7;
}

.preview {
	width: 100%;
	max-width: 160px;
	max-height: 160px;
	object-fit: contain;
	border-radius: 8px;
	box-shadow: var(--shadow-sm);
	border: 1px solid rgba(255, 255, 255, 0.1);
}

.split-images-grid {
	display: grid;
	gap: 0.5rem;
}

.split-image {
	max-width: 60px;
	max-height: 60px;
	object-fit: contain;
	border-radius: 4px;
	box-shadow: var(--shadow-sm);
	border: 1px solid rgba(255, 255, 255, 0.1);
	transition: var(--transition);
}

.split-image:hover {
	transform: scale(1.1);
	box-shadow: var(--shadow-md);
}

/* Download Button */
.download-all {
	grid-column: 1 / -1;
	margin-top: 0.5rem;
	padding: 0.5rem 1rem;
	background: var(--success-gradient);
	border: none;
	border-radius: 6px;
	color: white;
	font-weight: 600;
	cursor: pointer;
	transition: var(--transition);
	box-shadow: var(--shadow-sm);
	text-transform: uppercase;
	letter-spacing: 0.3px;
	font-size: 0.75rem;
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 0.25rem;
}

.download-all:hover {
	transform: translateY(-2px);
	box-shadow: var(--shadow-md);
}

/* Loader */
.loader {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: rgba(0, 0, 0, 0.7);
	backdrop-filter: blur(10px);
	display: none;
	justify-content: center;
	align-items: center;
	flex-direction: column;
	z-index: 1000;
}

.loader-spinner {
	width: 50px;
	height: 50px;
	border: 3px solid rgba(255, 255, 255, 0.1);
	border-left: 3px solid #4facfe;
	border-radius: 50%;
	animation: spin 1s linear infinite;
	margin-bottom: 1rem;
}

@keyframes spin {
	0% { transform: rotate(0deg); }
	100% { transform: rotate(360deg); }
}

.loader-text {
	color: var(--text-light);
	font-size: 1rem;
	font-weight: 500;
}

/* Scrollbar Styling */
.images-container::-webkit-scrollbar,
.left-panel::-webkit-scrollbar {
	width: 6px;
}

.images-container::-webkit-scrollbar-track,
.left-panel::-webkit-scrollbar-track {
	background: rgba(255, 255, 255, 0.1);
	border-radius: 3px;
}

.images-container::-webkit-scrollbar-thumb,
.left-panel::-webkit-scrollbar-thumb {
	background: rgba(255, 255, 255, 0.3);
	border-radius: 3px;
}

.images-container::-webkit-scrollbar-thumb:hover,
.left-panel::-webkit-scrollbar-thumb:hover {
	background: rgba(255, 255, 255, 0.5);
}

/* Responsive Design */
@media (max-width: 1024px) {
	.main-layout {
		grid-template-columns: 300px 1fr;
	}
	
	.images-container {
		grid-template-columns: 1fr;
	}
}

@media (max-width: 768px) {
	.container { 
		padding: 0.5rem; 
		height: 100vh;
	}
	
	.main-layout {
		grid-template-columns: 1fr;
		grid-template-rows: auto 1fr;
		gap: 0.5rem;
	}
	
	.left-panel {
		order: 1;
	}
	
	.controls-grid {
		grid-template-columns: 1fr;
		gap: 0.5rem;
	}
	
	.preview {
		max-width: 100px;
		max-height: 100px;
	}
	
	.split-image {
		max-width: 40px;
		max-height: 40px;
	}
	
	.title {
		font-size: 1.5rem;
	}
	
	.images-container {
		grid-template-columns: 1fr;
	}
	
	.image-content {
		grid-template-columns: 120px 1fr;
		gap: 0.75rem;
	}
}

@media (max-width: 480px) {
	.image-content {
		grid-template-columns: 1fr;
		gap: 0.5rem;
	}
	
	.image-preview-section {
		order: 1;
	}
	
	.image-splits-section {
		order: 2;
	}
	
	.preview {
		max-width: 120px;
		max-height: 120px;
	}
}