:root {
    /* Modern color palette with depth */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #dbeafe;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --secondary-hover: #059669;
    --secondary-light: #d1fae5;
    --accent-color: #f59e0b;
    --accent-hover: #d97706;
    --accent-light: #fef3c7;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --danger-light: #fee2e2;
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --surface-hover: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    
    /* Spacing scale */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Effects */
    --border-radius: 0.875rem;
    --border-radius-sm: 0.5rem;
    --border-radius-md: 0.625rem;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    --border-radius-full: 9999px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    
    font-size: 16px;
}

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    margin: 0;
    padding: 0;
    background: var(--background-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.dashboard {
    max-width: 100%;
    margin: 0 auto;
    padding: var(--spacing-sm);
    flex-grow: 1;
    width: 100%;
}

header {
    text-align: center;
    margin-bottom: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-color);
}

h1 {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 0 2px 0;
    letter-spacing: -0.025em;
}

h1::before {
    content: none;
}

.subtitle {
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
    margin: 0;
    font-weight: 400;
}

h2 {
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-lg) 0;
}

h3 {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
}

.upload-section {
    background: var(--surface-color);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--border-color);
    transition: box-shadow var(--transition-base);
}

.upload-section:hover {
    box-shadow: var(--shadow-xl);
}

.file-input-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.file-input-wrapper {
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-hover) 100%);
    color: white;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: 600;
    box-shadow: var(--shadow-md);
    border: 2px solid transparent;
    min-height: 60px;
}

.file-input-wrapper:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-hover);
}

.file-input-wrapper:active {
    transform: translateY(0);
}

.file-input-wrapper.loaded {
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    border-color: var(--success-color);
}

.file-input-wrapper.loading {
    background: linear-gradient(135deg, var(--accent-color) 0%, #d97706 100%);
    pointer-events: none;
}

.file-input-wrapper.error {
    background: linear-gradient(135deg, var(--danger-color) 0%, var(--danger-hover) 100%);
    animation: shake 0.5s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.file-input-wrapper input[type="file"] {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-name {
    display: block;
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    opacity: 0.9;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.upload-icon {
    margin-right: var(--spacing-sm);
    font-size: 1.25rem;
}

.control-panel {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    padding: var(--spacing-lg);
    background: var(--background-color);
    border-radius: var(--border-radius);
    border: 2px dashed var(--border-color);
}

.feature-category-select {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
    background: var(--surface-color);
    color: var(--text-primary);
    font-weight: 500;
    transition: all var(--transition-base);
    cursor: pointer;
}

.feature-category-select:hover {
    border-color: var(--primary-color);
}

.feature-category-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

button {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-base);
    font-weight: 700;
    cursor: pointer;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius-full);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    letter-spacing: 0.025em;
}

button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

button:hover::before {
    width: 300px;
    height: 300px;
}

button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

button:active {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

button:disabled {
    background: linear-gradient(135deg, var(--text-tertiary), var(--text-secondary));
    cursor: not-allowed;
    opacity: 0.5;
    transform: none;
}

button:disabled:hover {
    transform: none;
    box-shadow: var(--shadow-md);
}

button:disabled::before {
    display: none;
}

#resetButton {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
}

#resetButton:hover {
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.4), var(--shadow-xl);
}

#clearButton {
    background: linear-gradient(135deg, var(--danger-color) 0%, var(--danger-hover) 100%);
}

#clearButton:hover {
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.4), var(--shadow-xl);
}

#exportButton {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-hover) 100%);
}

#exportButton:hover {
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.4), var(--shadow-xl);
}

/* Loading States & Animations */
.progress-container {
    margin-bottom: var(--spacing-xl);
    opacity: 0;
    transform: translateY(-10px);
    transition: all var(--transition-base);
}

.progress-container.active {
    opacity: 1;
    transform: translateY(0);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--background-color);
    border-radius: 999px;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress {
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.progress::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

#loadingMessage {
    text-align: center;
    margin-top: var(--spacing-md);
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Fade in animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* Image Display */
.image-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.image-wrapper {
    background: var(--surface-color);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.image-wrapper:hover {
    box-shadow: var(--shadow-xl);
}

.image-wrapper h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--border-color);
    margin: 0 0 var(--spacing-xs) 0;
    font-size: 0.95rem;
}

.image-wrapper canvas {
    display: block;
}

.cropped-features-container {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 30px;
}

.cropped-features-column {
    flex: 1;
    max-width: calc(50% - 10px);
    background-color: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.cropped-features-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.cropped-feature {
    text-align: center;
    background-color: white;
    padding: 15px;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    flex: 1;
    min-width: calc(50% - 10px);
}

.cropped-feature canvas {
    width: 100%;
    height: auto;
    object-fit: contain;
    max-height: 200px;
    border: 1px solid #ddd;
    margin-top: 10px;
}

/* Cropped Features */
.cropped-features-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.cropped-features-column {
    background: var(--surface-color);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.cropped-features-column h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
}

.cropped-features-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-md);
}

.cropped-feature {
    text-align: center;
    background: var(--background-color);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.cropped-feature::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.cropped-feature:hover::before {
    transform: scaleX(1);
}

.cropped-feature:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.cropped-feature canvas {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    background: white;
}

.cropped-feature p {
    font-size: 0.875rem;
    color: var(--text-primary);
    margin: 0;
    font-weight: 500;
    line-height: 1.4;
}

.cropped-feature p i {
    color: var(--primary-color);
    margin-right: var(--spacing-xs);
}

/* Object Detection Specific */
.object-row {
    transition: all var(--transition-fast);
}

.object-row:hover {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.05), transparent) !important;
}

.object-row td i {
    margin-right: var(--spacing-xs);
    color: var(--primary-color);
}

/* Results & Comparison Table */
#featureComparison {
    background: var(--surface-color);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-2xl);
    border: 1px solid var(--border-color);
}

#comparisonTable {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    font-size: 0.95rem;
    background: var(--surface-color);
}

#comparisonTable th {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-lg) var(--spacing-xl);
    text-align: left;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    border-bottom: 3px solid var(--primary-dark);
}

#comparisonTable td {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.2s ease;
    vertical-align: middle;
}

#comparisonTable tr {
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

#comparisonTable tr:hover {
    background: linear-gradient(90deg, var(--surface-hover) 0%, var(--primary-light) 100%);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

#comparisonTable tr:nth-child(even) {
    background: var(--surface-hover);
}

#comparisonTable tr:nth-child(even):hover {
    background: linear-gradient(90deg, var(--surface-hover) 0%, var(--primary-light) 100%);
}

#comparisonTable tr.highlighted {
    background: rgba(37, 99, 235, 0.1) !important;
    box-shadow: inset 4px 0 0 var(--primary-color);
}

/* Similarity Score Badges */
.similarity-score {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.875rem;
}

.similarity-high {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.similarity-medium {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
}

.similarity-low {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--surface-color);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: var(--spacing-xs);
}

/* Confidence Controls */
.confidence-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--surface-color);
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
}

.confidence-controls label {
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

#confidenceSlider {
    width: 150px;
    height: 6px;
    border-radius: 999px;
    background: var(--border-color);
    -webkit-appearance: none;
}

#confidenceSlider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

#confidenceSlider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--shadow-lg);
}

#confidenceSlider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
}

/* Zoom Controls - Enhanced */
.zoom-controls {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
    align-items: center;
    padding: var(--spacing-xs);
    background: linear-gradient(135deg, var(--surface-color) 0%, var(--surface-hover) 100%);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.zoom-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    min-width: 40px;
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    transition: all 0.2s ease;
}

.zoom-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.zoom-btn:active {
    transform: translateY(0);
}

.roi-btn.active {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.3);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.3);
    }
    50% {
        box-shadow: 0 0 0 6px rgba(245, 158, 11, 0.5);
    }
}

.zoom-indicator {
    margin-left: auto;
    font-weight: 700;
    color: var(--primary-color);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--primary-light);
    border-radius: 999px;
    border: 2px solid var(--primary-color);
    font-size: 0.875rem;
    min-width: 60px;
    text-align: center;
}

/* ROI Selection */
.canvas-container {
    position: relative;
    cursor: default;
    transition: all 0.3s ease;
    border-radius: var(--border-radius-md);
    overflow: hidden;
}

.canvas-container.roi-mode {
    cursor: crosshair;
    box-shadow: 0 0 0 4px var(--accent-color), var(--shadow-lg);
    animation: roiPulse 2s ease-in-out infinite;
}

@keyframes roiPulse {
    0%, 100% {
        box-shadow: 0 0 0 4px var(--accent-color), var(--shadow-lg);
    }
    50% {
        box-shadow: 0 0 0 6px var(--accent-color), var(--shadow-xl);
    }
}

.roi-info {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    color: var(--text-primary);
    border-left: 4px solid #10b981;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.roi-info i {
    color: #10b981;
    margin-right: var(--spacing-xs);
}

.roi-info button {
    transition: all 0.2s ease;
}

.roi-info button:hover {
    background: #dc2626 !important;
    transform: scale(1.05);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .dashboard {
        padding: var(--spacing-lg);
    }
    
    .image-container {
        grid-template-columns: 1fr;
    }
    
    .control-panel {
        flex-direction: column;
    }
    
    h1 {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .file-input-container {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    #comparisonTable {
        font-size: 0.875rem;
    }
    
    #comparisonTable th,
    #comparisonTable td {
        padding: var(--spacing-sm);
    }
}

.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: #555;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

@media (max-width: 768px) {
    .image-container, .cropped-features-container {
        flex-direction: column;
    }

    .image-wrapper,
    .cropped-features-column {
        max-width: 100%;
    }

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

    button,
    .feature-category-select {
        width: 100%;
        margin-bottom: 10px;
    }
}

/* Zoom Controls */

.zoom-indicator {
    display: flex;
    align-items: center;
    padding: 0 8px;
    font-weight: bold;
    color: #34495e;
    min-width: 50px;
    justify-content: center;
}

/* Canvas and Image Display */
.canvas-container {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: grab;
    background: #f1f5f9;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.canvas-container:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
}

.canvas-container:active {
    cursor: grabbing;
}

.canvas-container.roi-mode {
    cursor: crosshair;
    box-shadow: 0 0 0 4px var(--accent-color), var(--shadow-lg);
    border-color: var(--accent-color);
    border-radius: var(--border-radius-lg);
    animation: pulse-border 2s ease-in-out infinite;
}

@keyframes pulse-border {
    0%, 100% {
        box-shadow: 0 0 0 4px var(--accent-color), var(--shadow-lg);
    }
    50% {
        box-shadow: 0 0 0 6px rgba(245, 158, 11, 0.5), var(--shadow-lg);
    }
}

.canvas-container canvas {
    display: block;
    transform-origin: 0 0;
    max-width: 100%;
    height: auto;
}

.image-wrapper {
    background: var(--surface-color);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.image-wrapper:hover {
    box-shadow: var(--shadow-lg);
}

.image-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

/* Zoom Controls */
.zoom-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    padding: var(--spacing-xs);
    background: var(--surface-color);
    border-radius: var(--border-radius-full);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.zoom-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--font-size-base);
    font-weight: 600;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

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

.zoom-btn:active {
    transform: scale(0.95);
}

.zoom-btn.roi-btn {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
}

.zoom-btn.roi-btn.active {
    background: linear-gradient(135deg, var(--accent-color), #d97706);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.3);
    animation: pulse 2s ease-in-out infinite;
}

.zoom-indicator {
    margin-left: auto;
    font-weight: 700;
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--primary-light);
    border-radius: var(--border-radius-full);
    min-width: 80px;
    text-align: center;
    font-size: var(--font-size-sm);
    border: 2px solid var(--primary-color);
}
    position: relative;
}

/* Highlight effect for clicked features */
.highlight-box {
    position: absolute;
    border: 3px solid #ff9900;
    box-shadow: 0 0 10px rgba(255, 153, 0, 0.5);
    pointer-events: none;
    z-index: 5;
    animation: pulse 1s ease-in-out;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Clickable table rows */
#comparisonTable tr.selected {
    background: linear-gradient(90deg, #dbeafe 0%, #bfdbfe 100%) !important;
    border-left: 5px solid var(--primary-color);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.5);
    transform: translateX(4px);
}

#comparisonTable tr.selected::before {
    content: '▶';
    position: absolute;
    left: -2px;
    color: var(--primary-color);
    font-size: 0.75rem;
    animation: pulse 2s ease-in-out infinite;
}

/* =============================================================================
   Comparison Mode Toolbar & Controls
   ============================================================================= */
.comparison-mode-toolbar {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.toolbar-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-right: var(--spacing-sm);
    white-space: nowrap;
}

.mode-btn {
    padding: 8px 16px;
    border: 2px solid var(--border-color);
    border-radius: 999px;
    background: var(--surface-color);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.mode-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.mode-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #fff;
    border-color: var(--primary-dark);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.mode-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--surface-hover);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.mode-ctrl-btn {
    padding: 6px 14px;
    border: 2px solid var(--border-color);
    border-radius: 999px;
    background: var(--surface-color);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mode-ctrl-btn.active {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.mode-ctrl-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.ctrl-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.mode-slider {
    width: 180px;
    accent-color: var(--primary-color);
}

.heatmap-score {
    font-weight: 700;
    color: var(--primary-color);
    background: var(--primary-light);
    padding: 4px 12px;
    border-radius: 999px;
    font-size: var(--font-size-sm);
}

/* Slider overlay */
.slider-line {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 3px;
    background: #fff;
    box-shadow: 0 0 8px rgba(0,0,0,0.4);
    pointer-events: none;
    z-index: 10;
    left: 50%;
    transform: translateX(-50%);
}

#mergedCanvasContainer {
    cursor: default;
    position: relative;
    overflow: hidden;
    border: 3px solid var(--border-color);
    border-radius: var(--border-radius);
    min-height: 400px;
    background: linear-gradient(45deg, #f8fafc 25%, transparent 25%, transparent 75%, #f8fafc 75%, #f8fafc),
                linear-gradient(45deg, #f8fafc 25%, transparent 25%, transparent 75%, #f8fafc 75%, #f8fafc);
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
    box-shadow: var(--shadow-md);
}

#mergedCanvasContainer canvas {
    display: block;
    max-width: 100%;
    margin: 0 auto;
}

#mergedCanvasView .image-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

/* =============================================================================
   Pixel Inspector / Magnifier Loupe
   ============================================================================= */
.pixel-loupe {
    position: absolute;
    pointer-events: none;
    z-index: 1000;
    display: none;
    border-radius: 50%;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.pixel-tooltip {
    position: absolute;
    pointer-events: none;
    z-index: 1001;
    display: none;
    background: rgba(15, 23, 42, 0.95);
    color: #e2e8f0;
    padding: 10px 14px;
    border-radius: 10px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    line-height: 1.6;
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.1);
    min-width: 200px;
}

.pixel-coords {
    color: #94a3b8;
    margin-bottom: 6px;
    font-size: 0.7rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 4px;
}

.pixel-color-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 3px 0;
}

.pixel-swatch {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    border: 1px solid rgba(255,255,255,0.3);
    flex-shrink: 0;
}

.pixel-label {
    color: #94a3b8;
    font-size: 0.7rem;
    min-width: 52px;
}

.pixel-values {
    color: #e2e8f0;
}

.toolbar-divider {
    width: 1px;
    height: 24px;
    background: var(--border-color);
    margin: 0 4px;
}

/* =============================================================================
   Enhanced ROI Panel
   ============================================================================= */
.roi-panel {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.roi-panel-header {
    padding: 10px 16px;
    background: linear-gradient(135deg, var(--surface-hover), var(--surface-color));
    border-bottom: 1px solid var(--border-color);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.roi-list {
    padding: 8px;
}

.roi-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    transition: background 0.15s;
}

.roi-item:hover {
    background: var(--surface-hover);
}

.roi-item-label {
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    min-width: 100px;
}

.roi-item-size {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    font-family: var(--font-mono);
}

.roi-item-score {
    font-size: var(--font-size-xs);
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 999px;
    margin-left: auto;
}

.roi-item-score.score-high { background: #d1fae5; color: #065f46; }
.roi-item-score.score-mid { background: #fef3c7; color: #92400e; }
.roi-item-score.score-low { background: #fee2e2; color: #991b1b; }

.roi-action-btn {
    width: 28px;
    height: 28px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--surface-color);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    transition: all 0.15s;
    padding: 0;
}

.roi-action-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
}

.roi-action-btn.roi-delete:hover {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

/* ── Dark Theme ──────────────────────────────────────────────────────────── */
[data-theme="dark"] {
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --surface-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --border-color: #334155;
    --border-hover: #475569;
    --primary-light: #1e3a5f;
    --secondary-light: #064e3b;
    --accent-light: #451a03;
    --danger-light: #450a0a;
}
[data-theme="dark"] canvas { background: #1e293b; }

/* ── Theme Toggle Button ─────────────────────────────────────────────────── */
#themeToggle {
    position: fixed; top: 1rem; right: 1rem; z-index: 1000;
    width: 40px; height: 40px; border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--surface-color); color: var(--text-primary);
    cursor: pointer; font-size: 1.1rem;
    display: flex; align-items: center; justify-content: center;
    box-shadow: var(--shadow-md); transition: all 0.2s;
}
#themeToggle:hover { transform: scale(1.1); }

/* ── Metadata Panel ──────────────────────────────────────────────────────── */
#metadataPanel {
    background: var(--surface-color); border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm); margin: 0.75rem 0;
    overflow: hidden; font-size: var(--font-size-sm);
}
#metadataPanel.collapsed .meta-table { display: none; }
#metadataPanel.collapsed .meta-chevron { transform: rotate(-90deg); }
.meta-header {
    padding: 0.5rem 0.75rem; cursor: pointer; font-weight: 600;
    display: flex; align-items: center; gap: 0.5rem;
    color: var(--text-primary); user-select: none;
}
.meta-header:hover { background: var(--surface-hover); }
.meta-chevron { margin-left: auto; transition: transform 0.2s; font-size: 0.75rem; }
.meta-table { width: 100%; border-collapse: collapse; }
.meta-table th, .meta-table td {
    padding: 0.35rem 0.75rem; text-align: left;
    border-top: 1px solid var(--border-color);
}
.meta-table th { color: var(--text-secondary); font-weight: 600; font-size: 0.75rem; text-transform: uppercase; }
.meta-label { color: var(--text-secondary); font-weight: 500; width: 90px; }
.meta-diff { color: var(--accent-color); font-weight: 600; }

/* ── Sortable Table Headers ──────────────────────────────────────────────── */
#comparisonTable th { position: relative; user-select: none; }
#comparisonTable th::after { content: ''; margin-left: 4px; opacity: 0.3; }
#comparisonTable th.sort-asc::after { content: '▲'; opacity: 1; }
#comparisonTable th.sort-desc::after { content: '▼'; opacity: 1; }

/* ── Keyboard Shortcut Hints ─────────────────────────────────────────────── */
.mode-btn .kbd { font-size: 0.65rem; opacity: 0.5; margin-left: 4px; font-family: var(--font-mono); }

/* Fullscreen Mode */
#imageViewerSection:fullscreen {
    background: var(--background-color, #f8fafc);
    padding: var(--spacing-xl);
    overflow-y: auto;
}
#imageViewerSection:fullscreen .comparison-mode-toolbar {
    display: flex !important;
}
#imageViewerSection:fullscreen .canvas-container {
    min-height: 70vh;
}

/* S3 Browse Modal */
.s3-modal {
    position: fixed; inset: 0; z-index: 10000;
    background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center;
}
.s3-modal-content {
    background: var(--surface-color, #fff); border-radius: var(--border-radius-lg, 12px);
    padding: 24px; width: 90%; max-width: 700px; max-height: 80vh; display: flex; flex-direction: column;
    box-shadow: var(--shadow-xl, 0 8px 32px rgba(0,0,0,0.2));
}
.s3-modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.s3-input {
    padding: 8px 12px; border: 1px solid var(--border-color, #ddd); border-radius: 8px;
    font-size: 0.9rem; background: var(--bg-color, #f8f9fa); color: var(--text-color, #333);
}
.s3-breadcrumb { font-size: 0.85rem; margin-bottom: 8px; color: var(--text-secondary, #666); }
.s3-breadcrumb span { cursor: pointer; color: var(--accent-color, #2563eb); }
.s3-breadcrumb span:hover { text-decoration: underline; }
.s3-file-list { overflow-y: auto; flex: 1; }
.s3-file-item {
    padding: 10px 12px; border-bottom: 1px solid var(--border-color, #eee); cursor: pointer;
    display: flex; align-items: center; gap: 10px; border-radius: 6px; transition: background 0.15s;
}
.s3-file-item:hover { background: var(--hover-bg, #f0f4ff); }
.s3-file-item .s3-meta { margin-left: auto; font-size: 0.8rem; color: var(--text-secondary, #999); }

/* S3 Browse Buttons */
.s3-btn {
    padding: 10px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    background: linear-gradient(135deg, #ff9900 0%, #e68a00 100%);
    color: #fff;
    border: none;
    border-radius: var(--border-radius-full, 50px);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(255, 153, 0, 0.3);
    min-height: auto;
}
.s3-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(255, 153, 0, 0.4);
    background: linear-gradient(135deg, #ffad33 0%, #ff9900 100%);
}
.s3-btn:active {
    transform: translateY(0);
}
.s3-close-btn {
    background: none; border: none; font-size: 1.5rem; cursor: pointer; min-height: auto;
    padding: 4px 10px; border-radius: 8px; color: var(--text-secondary, #666); box-shadow: none;
}
.s3-close-btn:hover { background: var(--hover-bg, #f0f0f0); color: var(--text-primary, #333); box-shadow: none; }

/* ============================================================
   Multi-stage loading indicator
   ============================================================ */

/* (1) Skeleton loader */
.skeleton-line {
    height: 18px;
    border-radius: 4px;
    background: linear-gradient(90deg, #e5e7eb 25%, #f3f4f6 50%, #e5e7eb 75%);
    background-size: 200% 100%;
    animation: skeletonShimmer 1.5s ease-in-out infinite;
}

.skeleton-active td {
    padding: 12px;
    border: none !important;
}

@keyframes skeletonShimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* (3) Canvas pulsing animation during analysis */
.canvas-container.analyzing-pulse {
    animation: analyzePulse 1.5s ease-in-out infinite;
    box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.4);
}

@keyframes analyzePulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.4); }
    50% { box-shadow: 0 0 0 8px rgba(37, 99, 235, 0); }
}

/* ============================================================
   Enhanced table: sort indicators, multi-select, group headers
   ============================================================ */

/* (1) Sort indicator arrows */
#comparisonTable th.sort-asc::after { content: ' ▲'; font-size: 0.75em; }
#comparisonTable th.sort-desc::after { content: ' ▼'; font-size: 0.75em; }
#comparisonTable th { user-select: none; }

/* (4) Multi-select row styling */
#comparisonTable tr.multi-selected {
    background: rgba(37, 99, 235, 0.08) !important;
}

/* (6) Group header */
#comparisonTable tr.group-header td {
    padding: 8px 12px;
    font-size: 0.95rem;
}
#comparisonTable tr.group-header .group-chevron {
    transition: transform 0.2s;
    font-size: 0.8em;
    color: var(--text-secondary, #64748b);
}

/* ============================================================
   OCR Settings Panel
   ============================================================ */

.ocr-settings {
    width: 100%;
    padding: 10px 0;
    border-top: 1px solid var(--border-color, #e2e8f0);
    margin-top: 8px;
}
.ocr-toggle-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 8px;
}
.toggle-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    user-select: none;
}
.toggle-label input[type="checkbox"] { display: none; }
.toggle-slider {
    position: relative;
    width: 36px;
    height: 20px;
    background: #cbd5e1;
    border-radius: 10px;
    transition: background 0.2s;
}
.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    background: white;
    border-radius: 50%;
    transition: transform 0.2s;
}
.toggle-label input:checked + .toggle-slider {
    background: #3b82f6;
}
.toggle-label input:checked + .toggle-slider::after {
    transform: translateX(16px);
}
.ocr-slider-row {
    font-size: 0.85rem;
}
.ocr-slider-row input[type="range"] {
    width: 100%;
    margin-top: 4px;
}

/* Engine attribution badge */
.engine-badge {
    display: inline-block;
    padding: 1px 6px;
    border-radius: 8px;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    vertical-align: middle;
}
.engine-badge.tesseract { background: #dbeafe; color: #1e40af; }
.engine-badge.easyocr   { background: #fef3c7; color: #92400e; }

/* ── Phase 0+1: Navigation & Status Bar ──────────────────────────────────── */
.nav-status-bar {
    display: flex;
    align-items: center;
    height: 28px;
    padding: 0 12px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    user-select: text;
}
.nav-status-bar .sb-sep { margin: 0 10px; color: var(--border-color); }
.nav-status-bar .sb-swatch {
    display: inline-block; width: 12px; height: 12px;
    border-radius: 2px; border: 1px solid var(--border-color); margin-left: 6px;
}
.nav-status-bar .sb-zoom { color: var(--primary-color); font-weight: 600; }

.nav-canvas-label {
    color: var(--text-secondary);
    font-size: 12px; padding: 4px 0;
    margin-top: 4px; user-select: none;
}


.zoom-presets { display: inline-flex; gap: 2px; margin-right: 8px; }
.zoom-presets button {
    padding: 2px 8px; font-size: .75rem; border: 1px solid var(--border-color);
    border-radius: 4px; background: var(--surface-color); color: var(--text-secondary);
    cursor: pointer; transition: all var(--transition-fast);
}
.zoom-presets button:hover { background: var(--primary-light); }
.zoom-presets button.active { background: var(--primary-color); color: #fff; border-color: var(--primary-color); }

/* Shortcut cheat sheet modal */
.shortcut-modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,.5);
    z-index: 10000; display: flex; align-items: center; justify-content: center;
}
.shortcut-modal {
    background: var(--surface-color); border-radius: 12px;
    padding: 24px 32px; max-width: 520px; width: 90%;
    box-shadow: var(--shadow-xl); color: var(--text-primary);
    max-height: 80vh; overflow-y: auto;
}
.shortcut-modal h3 { margin: 0 0 16px; font-size: 1.2rem; }
.shortcut-modal table { width: 100%; border-collapse: collapse; }
.shortcut-modal td { padding: 6px 8px; border-bottom: 1px solid var(--border-color); }
.shortcut-modal td:first-child { font-family: var(--font-mono); font-weight: 600; white-space: nowrap; width: 100px; }
.shortcut-modal .close-btn {
    float: right; background: none; border: none; font-size: 1.4rem;
    cursor: pointer; color: var(--text-secondary); line-height: 1;
}

/* Image info overlay */
.canvas-info-overlay {
    position: absolute; top: 8px; right: 8px;
    background: rgba(0,0,0,.75); color: #e2e8f0;
    font-size: 11px; font-family: var(--font-mono);
    padding: 8px 12px; border-radius: 6px;
    z-index: 10; pointer-events: none; line-height: 1.6;
}

/* Pixel grid at high zoom */
.canvas-container { position: relative; }

/* ── Phase 2: Histogram Panel ─────────────────────────────────────── */
.histogram-panel {
    background: var(--surface-color); border: 1px solid var(--border-color);
    border-radius: var(--border-radius); margin: var(--spacing-md) auto;
    max-width: 100%; box-shadow: var(--shadow-md);
}
.histogram-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 16px; border-bottom: 1px solid var(--border-color);
}
.histogram-title { font-weight: 600; font-size: var(--font-size-sm); }
.histogram-controls { display: flex; align-items: center; gap: 10px; }
.hist-btn {
    padding: 4px 10px; border-radius: 6px; border: 1px solid var(--border-color);
    background: var(--surface-color); cursor: pointer; font-size: var(--font-size-xs);
}
.hist-btn:hover { background: var(--surface-hover); }
.hist-close { font-size: 1.1rem; line-height: 1; }
.hist-roi-label { font-size: var(--font-size-xs); display: flex; align-items: center; gap: 4px; cursor: pointer; }
.histogram-body { display: flex; gap: 16px; padding: 12px 16px; }
.histogram-col { flex: 1; min-width: 0; }
.histogram-col-title { font-size: var(--font-size-xs); color: var(--text-secondary); margin-bottom: 6px; font-weight: 600; }
.histogram-col canvas { width: 100%; height: 120px; border: 1px solid var(--border-color); border-radius: 6px; background: #0f172a; }
.histogram-stats {
    display: flex; gap: 12px; margin-top: 6px; font-size: var(--font-size-xs); color: var(--text-secondary);
}
.histogram-stats b { color: var(--text-primary); }
.hist-no-data { color: var(--text-tertiary); font-style: italic; }
.histogram-delta {
    display: flex; gap: 24px; padding: 8px 16px; border-top: 1px solid var(--border-color);
    font-size: var(--font-size-xs);
}
.delta-up { color: var(--success-color); }
.delta-down { color: var(--danger-color); }
.delta-same { color: var(--text-tertiary); }

/* ── Phase 2: Ruler Tool ──────────────────────────────────────────── */
.ruler-label {
    position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%);
    background: rgba(0,0,0,.85); color: #f8fafc; padding: 8px 16px;
    border-radius: 8px; font-family: var(--font-mono); font-size: var(--font-size-sm);
    z-index: 9999; pointer-events: none; white-space: nowrap;
}

/* ── Phase 2: ROI Statistics ──────────────────────────────────────── */
.roi-stats-detail {
    display: flex; gap: 12px; font-size: var(--font-size-xs); color: var(--text-secondary);
    margin-top: 4px;
}
.roi-stats-detail b { color: var(--text-primary); }

/* ── Phase 2: Error Recovery Cards ────────────────────────────────── */
.error-card {
    background: var(--danger-light); border: 1px solid var(--danger-color);
    border-radius: var(--border-radius); padding: 16px 20px; margin: var(--spacing-md) 0;
    display: flex; align-items: flex-start; gap: 12px;
}
.error-card-icon { font-size: 1.5rem; flex-shrink: 0; }
.error-card-body { flex: 1; }
.error-card-title { font-weight: 600; color: var(--danger-color); margin-bottom: 4px; }
.error-card-message { font-size: var(--font-size-sm); color: var(--text-secondary); margin-bottom: 8px; }
.error-card-actions { display: flex; gap: 8px; }
.error-card-actions button {
    padding: 6px 14px; border-radius: 6px; border: 1px solid var(--border-color);
    background: var(--surface-color); cursor: pointer; font-size: var(--font-size-xs); font-weight: 500;
}
.error-card-actions button.primary { background: var(--primary-color); color: #fff; border-color: var(--primary-color); }
.error-card-actions button:hover { opacity: 0.85; }
.error-card-countdown { font-family: var(--font-mono); font-size: var(--font-size-sm); color: var(--text-secondary); margin-top: 6px; }

/* ── Phase 2: Pre-submit validation tooltip ───────────────────────── */
.validation-tooltip {
    position: absolute; bottom: calc(100% + 8px); left: 50%; transform: translateX(-50%);
    background: var(--warning-color); color: #fff; padding: 6px 12px;
    border-radius: 6px; font-size: var(--font-size-xs); white-space: nowrap;
    pointer-events: none; z-index: 100; opacity: 0; transition: opacity 0.2s;
}
.validation-tooltip.visible { opacity: 1; }

/* ── Phase 3: Sticky Section Navigation ───────────────────────────── */
.sticky-nav {
    position: sticky; top: 0; z-index: 100; background: var(--surface-color);
    border-bottom: 1px solid var(--border-color); padding: 0 16px;
    display: flex; gap: 0;
}
#imageViewerSection,
#featureComparison,
.upload-section { scroll-margin-top: 48px; }
.sticky-nav-tab {
    padding: 10px 18px; border: none; background: none; cursor: pointer;
    font-size: var(--font-size-sm); font-weight: 500; color: var(--text-secondary);
    border-bottom: 2px solid transparent; transition: color 0.15s, border-color 0.15s;
}
.sticky-nav-tab:hover { color: var(--text-primary); }
.sticky-nav-tab.active { color: var(--primary-color); border-bottom-color: var(--primary-color); }


/* ── Phase 4: ROI Manager Panel ───────────────────────────────────── */
.roi-manager-panel {
    background: var(--surface-color); border: 1px solid var(--border-color);
    border-radius: var(--border-radius); margin: var(--spacing-md) auto;
    max-width: 100%; box-shadow: var(--shadow-md); max-height: 300px; overflow-y: auto;
}
.roi-mgr-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 16px; border-bottom: 1px solid var(--border-color);
}
.roi-mgr-title { font-weight: 600; font-size: var(--font-size-sm); }
.roi-mgr-actions { display: flex; gap: 6px; }
.roi-mgr-btn {
    padding: 4px 8px; border-radius: 6px; border: 1px solid var(--border-color);
    background: var(--surface-color); cursor: pointer; font-size: var(--font-size-xs);
}
.roi-mgr-btn:hover { background: var(--surface-hover); }
.roi-mgr-body { padding: 8px 16px; }
.roi-mgr-empty { color: var(--text-tertiary); font-size: var(--font-size-sm); padding: 12px 0; text-align: center; }
.roi-mgr-empty kbd { background: var(--surface-hover); padding: 2px 6px; border-radius: 4px; font-size: var(--font-size-xs); }
.roi-mgr-row {
    display: flex; align-items: center; justify-content: space-between;
    padding: 8px 12px; margin-bottom: 4px; border-radius: 6px; background: var(--surface-hover);
}
.roi-mgr-info { display: flex; flex-direction: column; gap: 2px; }
.roi-mgr-label { font-weight: 600; font-size: var(--font-size-sm); }
.roi-mgr-dims { font-size: var(--font-size-xs); color: var(--text-secondary); }
.roi-mgr-stats { font-size: var(--font-size-xs); color: var(--text-tertiary); }
.roi-mgr-btns { display: flex; gap: 4px; }
.roi-mgr-btns button {
    padding: 4px 8px; border-radius: 4px; border: 1px solid var(--border-color);
    background: var(--surface-color); cursor: pointer; font-size: var(--font-size-xs);
}
.roi-mgr-btns button:hover { background: var(--danger-light); }

/* ── Phase 4: Line Profile Panel ──────────────────────────────────── */
.line-profile-panel {
    background: var(--surface-color); border: 1px solid var(--border-color);
    border-radius: var(--border-radius); margin: var(--spacing-md) auto;
    max-width: 100%; box-shadow: var(--shadow-md);
}
.lp-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 16px; border-bottom: 1px solid var(--border-color); font-weight: 600; font-size: var(--font-size-sm);
}
.lp-close {
    padding: 4px 8px; border-radius: 6px; border: 1px solid var(--border-color);
    background: var(--surface-color); cursor: pointer;
}
.line-profile-panel canvas { width: 100%; height: 150px; display: block; background: #0f172a; }
.lp-legend { padding: 6px 16px; font-size: var(--font-size-xs); display: flex; gap: 16px; }
.lp-leg1 { color: #3b82f6; }
.lp-leg2 { color: #ef4444; }

/* ── Phase 4: Session History ─────────────────────────────────────── */
.history-item {
    display: flex; gap: 8px; align-items: center; padding: 6px 0;
    border-bottom: 1px solid var(--border-color); font-size: var(--font-size-xs);
}
.history-type {
    background: var(--primary-light); color: var(--primary-dark); padding: 2px 8px;
    border-radius: 4px; font-weight: 600; font-size: 10px; text-transform: uppercase;
}
.history-files { flex: 1; color: var(--text-secondary); }
.history-date { color: var(--text-tertiary); white-space: nowrap; }
.history-empty { color: var(--text-tertiary); font-size: var(--font-size-sm); padding: 12px 0; text-align: center; }

/* ── Phase 4: Filmstrip Navigator ─────────────────────────────────── */
.filmstrip-panel {
    background: var(--surface-color); border: 1px solid var(--border-color);
    border-radius: var(--border-radius); margin: var(--spacing-md) auto; max-width: 100%;
}
.filmstrip-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 16px; border-bottom: 1px solid var(--border-color);
}
.filmstrip-title { font-weight: 600; font-size: var(--font-size-sm); }
.filmstrip-controls { display: flex; gap: 6px; align-items: center; }
.filmstrip-input {
    padding: 5px 10px; border-radius: 6px; border: 1px solid var(--border-color);
    font-size: var(--font-size-xs); width: 120px;
}
.filmstrip-load-btn, .filmstrip-close-btn {
    padding: 5px 12px; border-radius: 6px; border: 1px solid var(--border-color);
    background: var(--surface-color); cursor: pointer; font-size: var(--font-size-xs);
}
.filmstrip-load-btn { background: var(--primary-color); color: #fff; border-color: var(--primary-color); }
.filmstrip-strip {
    display: flex; gap: 8px; padding: 12px 16px; overflow-x: auto; min-height: 60px;
}
.filmstrip-thumb {
    flex-shrink: 0; width: 90px; padding: 8px; border-radius: 8px;
    border: 2px solid var(--border-color); cursor: pointer; text-align: center;
    transition: border-color 0.15s, background 0.15s;
}
.filmstrip-thumb:hover { border-color: var(--primary-color); background: var(--primary-light); }
.filmstrip-thumb.loaded { border-color: var(--success-color); }
.filmstrip-thumb.loading { opacity: 0.5; }
.filmstrip-thumb-icon { font-size: 1.2rem; color: var(--text-tertiary); margin-bottom: 4px; }
.filmstrip-thumb-name { font-size: 10px; color: var(--text-primary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.filmstrip-thumb-size { font-size: 9px; color: var(--text-tertiary); }
.filmstrip-loading { padding: 16px; text-align: center; color: var(--text-tertiary); font-size: var(--font-size-sm); }

/* ── Phase 4: Batch Comparison ────────────────────────────────────── */
.batch-panel {
    background: var(--surface-color); border: 1px solid var(--border-color);
    border-radius: var(--border-radius); margin: var(--spacing-md) auto; max-width: 100%;
}
.batch-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 16px; border-bottom: 1px solid var(--border-color);
}
.batch-title { font-weight: 600; font-size: var(--font-size-sm); }
.batch-close {
    padding: 4px 8px; border-radius: 6px; border: 1px solid var(--border-color);
    background: var(--surface-color); cursor: pointer;
}
.batch-config { display: flex; gap: 6px; padding: 12px 16px; align-items: center; flex-wrap: wrap; }
.batch-run-btn {
    padding: 6px 14px; border-radius: 6px; border: none;
    background: var(--primary-color); color: #fff; cursor: pointer; font-size: var(--font-size-xs); font-weight: 500;
}
.batch-export-btn {
    padding: 6px 14px; border-radius: 6px; border: 1px solid var(--border-color);
    background: var(--surface-color); cursor: pointer; font-size: var(--font-size-xs);
}
.batch-export-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.batch-progress { padding: 8px 16px; }
.batch-progress-bar { height: 6px; background: var(--border-color); border-radius: 3px; overflow: hidden; }
.batch-progress-fill { height: 100%; background: var(--primary-color); transition: width 0.3s; width: 0; }
.batch-progress-text { font-size: var(--font-size-xs); color: var(--text-secondary); margin-top: 4px; display: block; }
.batch-results { padding: 0 16px 12px; }
.batch-table { width: 100%; border-collapse: collapse; font-size: var(--font-size-xs); }
.batch-table th { text-align: left; padding: 8px; border-bottom: 2px solid var(--border-color); color: var(--text-secondary); font-weight: 600; }
.batch-table td { padding: 6px 8px; border-bottom: 1px solid var(--border-color); }
.batch-ok { color: var(--success-color); }
.batch-err { color: var(--danger-color); font-size: 10px; }
.batch-empty { padding: 16px; text-align: center; color: var(--text-tertiary); font-size: var(--font-size-sm); }