/* ============================================
    ROOT VARIABLES - Dark Theme Color System
    ============================================ */
    :root {
        /* Core Colors */
        --bg-primary: #0a0e14;
        --bg-secondary: #151922;
        --bg-tertiary: #1e2430;
        --bg-hover: #252d3d;
        
        /* Accent Colors */
        --accent-primary: #00d9ff;
        --accent-secondary: #7c3aed;
        --accent-warning: #fbbf24;
        --accent-success: #10b981;
        --accent-danger: #ef4444;
        
        /* Text Colors */
        --text-primary: #e2e8f0;
        --text-secondary: #94a3b8;
        --text-muted: #64748b;
        
        /* Borders & Shadows */
        --border-color: #2d3748;
        --border-color-hover: #3f4e66;
        --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
        --glow-cyan: 0 0 20px rgba(0, 217, 255, 0.3);
        --glow-purple: 0 0 20px rgba(124, 58, 237, 0.3);
        
        /* Spacing */
        --spacing-xs: 4px;
        --spacing-sm: 8px;
        --spacing-md: 16px;
        --spacing-lg: 24px;
        --spacing-xl: 32px;
        
        /* Typography */
        --font-primary: 'Archivo', -apple-system, BlinkMacSystemFont, sans-serif;
        --font-mono: 'JetBrains Mono', 'Courier New', monospace;
        
        /* Canvas */
        --canvas-bg: #0f1419;
        --grid-color: rgba(255, 255, 255, 0.05);
    }
    
    /* ============================================
        GLOBAL RESET & BASE STYLES
        ============================================ */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }
    
    html, body {
        width: 100%;
        height: 100%;
        overflow: hidden;
        overflow-y: scroll;
        font-family: var(--font-primary);
        background: var(--bg-primary);
        color: var(--text-primary);
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    
    /* ============================================
        CUSTOM SCROLLBAR
        ============================================ */
    ::-webkit-scrollbar {
        width: 8px;
        height: 8px;
    }
    
    ::-webkit-scrollbar-track {
        background: var(--bg-secondary);
    }
    
    ::-webkit-scrollbar-thumb {
        background: var(--bg-hover);
        border-radius: 4px;
    }
    
    ::-webkit-scrollbar-thumb:hover {
        background: var(--border-color-hover);
    }
    
    /* ============================================
        MAIN LAYOUT CONTAINER
        ============================================ */
    .app-container {
        display: flex;
        flex-direction: column;
        width: 100%;
        height: 100vh;
        background: linear-gradient(135deg, var(--bg-primary) 0%, #0d1117 100%);
    }
    
    /* ============================================
        HEADER / TOOLBAR
        ============================================ */
    .header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: var(--spacing-sm) var(--spacing-md);
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        position: relative;
        z-index: 100;
    }
    
    .header::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 1px;
        background: linear-gradient(90deg, 
            transparent, 
            var(--accent-primary), 
            var(--accent-secondary), 
            transparent
        );
        opacity: 0.5;
    }
    
    .ilogo-section {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .ilogo {
        font-size: 24px;
        font-weight: 700;
        background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        letter-spacing: -0.5px;
        text-transform: uppercase;
    }
    
    .version-badge {
        padding: 4px 10px;
        background: rgba(0, 217, 255, 0.1);
        border: 1px solid rgba(0, 217, 255, 0.3);
        border-radius: 12px;
        font-size: 11px;
        font-weight: 600;
        color: var(--accent-primary);
        font-family: var(--font-mono);
    }
    
    .toolbar {
        display: flex;
        gap: var(--spacing-sm);
        align-items: center;
    }
    
    /* ============================================
        BUTTONS
        ============================================ */
    .btn {
        padding: 10px 20px;
        background: var(--bg-tertiary);
        border: 1px solid var(--border-color);
        border-radius: 8px;
        color: var(--text-primary);
        font-family: var(--font-primary);
        font-size: 14px;
        font-weight: 500;
        cursor: pointer;
        transition: all 0.2s ease;
        display: flex;
        align-items: center;
        gap: 8px;
        position: relative;
        overflow: hidden;
    }
    
    .btn::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
        transition: left 0.5s ease;
    }
    
    .btn:hover::before {
        left: 100%;
    }
    
    .btn:hover {
        background: var(--bg-hover);
        border-color: var(--border-color-hover);
        transform: translateY(-1px);
        box-shadow: var(--shadow-sm);
    }
    
    .btn:active {
        transform: translateY(0);
    }
    
    .btn-primary {
        background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
        border: none;
        color: white;
        font-weight: 600;
        box-shadow: var(--glow-cyan);
    }
    
    .btn-primary:hover {
        box-shadow: var(--glow-purple);
        transform: translateY(-2px);
    }
    
    .btn-icon {
        padding: 10px;
        min-width: auto;
    }
    
    /* File input styling */
    #imageInput {
        display: none;
    }
    
    /* ============================================
        MAIN CONTENT AREA
        ============================================ */
    .main-content {
        display: flex;
        flex: 1;
        overflow: hidden;
        position: relative;
    }
    
    /* ============================================
        CANVAS CONTAINER
        ============================================ */
    .canvas-container {
        flex: 1;
        position: relative;
        background: var(--canvas-bg);
        overflow: hidden;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    /* Checkerboard pattern for transparency */
    .canvas-wrapper {
        position: relative;
        cursor: crosshair;
        box-shadow: var(--shadow-lg);
        background-image: 
            linear-gradient(45deg, #1a1f2e 25%, transparent 25%),
            linear-gradient(-45deg, #1a1f2e 25%, transparent 25%),
            linear-gradient(45deg, transparent 75%, #1a1f2e 75%),
            linear-gradient(-45deg, transparent 75%, #1a1f2e 75%);
        background-size: 20px 20px;
        background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    }
    
    #mainCanvas {
        display: block;
        image-rendering: pixelated;
        image-rendering: -moz-crisp-edges;
        image-rendering: crisp-edges;
    }
    
    /* Crosshair cursor */
    .canvas-wrapper.inspecting {
        cursor: none;
    }
    
    .crosshair {
        position: absolute;
        pointer-events: none;
        display: none;
        z-index: 10;
    }
    
    .crosshair.active {
        display: block;
    }
    
    .crosshair-line {
        position: absolute;
        background: var(--accent-primary);
        opacity: 0.6;
    }
    
    .crosshair-horizontal {
        height: 1px;
        width: 100vw;
        left: -50vw;
        top: 0;
    }
    
    .crosshair-vertical {
        width: 1px;
        height: 100vh;
        top: -50vh;
        left: 0;
    }
    
    .crosshair-center {
        position: absolute;
        width: 20px;
        height: 20px;
        border: 2px solid var(--accent-primary);
        border-radius: 50%;
        left: -10px;
        top: -10px;
        background: rgba(0, 217, 255, 0.1);
        box-shadow: var(--glow-cyan);
    }
    
    /* ============================================
        SIDEBAR PANELS
        ============================================ */
    .sidebar {
        width: 360px;
        background: var(--bg-secondary);
        border-left: 1px solid var(--border-color);
        display: flex;
        flex-direction: column;
        overflow-y: auto;
        box-shadow: var(--shadow-lg);
    }
    
    .panel {
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--border-color);
    }
    
    .panel:last-child {
        border-bottom: none;
    }
    
    .panel-title {
        font-size: 13px;
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 1px;
        color: var(--text-secondary);
        margin-bottom: var(--spacing-md);
        display: flex;
        align-items: center;
        gap: 8px;
    }
    
    .panel-title::before {
        content: '';
        width: 3px;
        height: 16px;
        background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
        border-radius: 2px;
    }
    
    /* ============================================
        COLOR DISPLAY
        ============================================ */
    .color-preview-large {
        width: 100%;
        height: 120px;
        border-radius: 12px;
        border: 2px solid var(--border-color);
        margin-bottom: var(--spacing-md);
        position: relative;
        overflow: hidden;
        box-shadow: var(--shadow-md);
        background-image: 
            linear-gradient(45deg, #1a1f2e 25%, transparent 25%),
            linear-gradient(-45deg, #1a1f2e 25%, transparent 25%),
            linear-gradient(45deg, transparent 75%, #1a1f2e 75%),
            linear-gradient(-45deg, transparent 75%, #1a1f2e 75%);
        background-size: 20px 20px;
        background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    }
    
    .color-fill {
        width: 100%;
        height: 100%;
    }
    
    .color-values-grid {
        display: grid;
        gap: var(--spacing-sm);
    }
    
    .color-value-row {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 12px 16px;
        background: var(--bg-tertiary);
        border-radius: 8px;
        border: 1px solid var(--border-color);
        transition: all 0.2s ease;
        cursor: pointer;
    }
    
    .color-value-row:hover {
        background: var(--bg-hover);
        border-color: var(--border-color-hover);
        transform: translateX(4px);
    }
    
    .color-value-label {
        font-size: 12px;
        font-weight: 600;
        color: var(--text-secondary);
        font-family: var(--font-mono);
        text-transform: uppercase;
    }
    
    .color-value-text {
        font-size: 14px;
        font-family: var(--font-mono);
        color: var(--text-primary);
        font-weight: 500;
        display: flex;
        align-items: center;
        gap: 8px;
    }
    
    .copy-icon {
        opacity: 0;
        transition: opacity 0.2s ease;
        font-size: 12px;
        color: var(--accent-primary);
    }
    
    .color-value-row:hover .copy-icon {
        opacity: 1;
    }
    
    /* ============================================
        COORDINATE & INFO DISPLAYS
        ============================================ */
    .info-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-md);
    }
    
    .info-card {
        padding: 16px;
        background: var(--bg-tertiary);
        border-radius: 8px;
        border: 1px solid var(--border-color);
        transition: all 0.2s ease;
    }
    
    .info-card:hover {
        border-color: var(--accent-primary);
        box-shadow: 0 0 12px rgba(0, 217, 255, 0.15);
    }
    
    .info-label {
        font-size: 11px;
        color: var(--text-muted);
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        margin-bottom: 8px;
    }
    
    .info-value {
        font-size: 20px;
        font-family: var(--font-mono);
        font-weight: 600;
        color: var(--text-primary);
        background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    
    /* ============================================
        ZOOM CONTROLS
        ============================================ */
    .zoom-controls {
        position: absolute;
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        display: flex;
        flex-direction: column;
        gap: var(--spacing-sm);
        z-index: 50;
    }
    
    .zoom-btn {
        width: 48px;
        height: 48px;
        background: var(--bg-secondary);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        color: var(--text-primary);
        font-size: 20px;
        cursor: pointer;
        transition: all 0.2s ease;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: var(--shadow-md);
    }
    
    .zoom-btn:hover {
        background: var(--bg-hover);
        border-color: var(--accent-primary);
        box-shadow: var(--glow-cyan);
        transform: scale(1.05);
    }
    
    .zoom-display {
        width: 48px;
        padding: 12px 8px;
        background: var(--bg-secondary);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        text-align: center;
        font-family: var(--font-mono);
        font-size: 13px;
        font-weight: 600;
        color: var(--accent-primary);
        box-shadow: var(--shadow-md);
    }
    
    /* ============================================
        EMPTY STATE
        ============================================ */
    .empty-state {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        text-align: center;
        z-index: 1;
        animation: fadeIn 0.5s ease;
    }
    
    @keyframes fadeIn {
        from {
            opacity: 0;
            transform: translate(-50%, -50%) scale(0.95);
        }
        to {
            opacity: 1;
            transform: translate(-50%, -50%) scale(1);
        }
    }
    
    .empty-state-icon {
        font-size: 80px;
        margin-bottom: var(--spacing-lg);
        opacity: 0.3;
    }
    
    .empty-state-title {
        font-size: 24px;
        font-weight: 700;
        margin-bottom: var(--spacing-sm);
        background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    
    .empty-state-text {
        font-size: 16px;
        color: var(--text-secondary);
        margin-bottom: var(--spacing-lg);
    }
    
    /* ============================================
        MAGNIFIER LOUPE
        ============================================ */
    .magnifier {
        position: absolute;
        width: 200px;
        height: 200px;
        border: 3px solid var(--accent-primary);
        border-radius: 50%;
        pointer-events: none;
        display: none;
        z-index: 100;
        box-shadow: var(--glow-cyan), var(--shadow-lg);
        background: var(--bg-primary);
        overflow: hidden;
    }
    
    .magnifier.active {
        display: block;
    }
    
    .magnifier canvas {
        width: 100%;
        height: 100%;
        image-rendering: pixelated;
    }
    
    .magnifier::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 10px;
        height: 10px;
        border: 2px solid var(--accent-primary);
        transform: translate(-50%, -50%);
        background: rgba(0, 217, 255, 0.2);
    }
    
    /* ============================================
        TOAST NOTIFICATIONS
        ============================================ */
    .toast {
        position: fixed;
        bottom: var(--spacing-lg);
        left: 50%;
        transform: translateX(-50%) translateY(100px);
        padding: 16px 24px;
        background: var(--bg-secondary);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        box-shadow: var(--shadow-lg);
        color: var(--text-primary);
        font-family: var(--font-mono);
        font-size: 14px;
        z-index: 1000;
        opacity: 0;
        transition: all 0.3s ease;
    }
    
    .toast.show {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    
    .toast.success {
        border-color: var(--accent-success);
        background: rgba(16, 185, 129, 0.1);
    }
    
    /* ============================================
        IMAGE STATS SECTION
        ============================================ */
    .stats-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-sm);
    }
    
    .stat-item {
        padding: 12px;
        background: var(--bg-tertiary);
        border-radius: 8px;
        border: 1px solid var(--border-color);
    }
    
    .stat-label {
        font-size: 11px;
        color: var(--text-muted);
        margin-bottom: 4px;
        text-transform: uppercase;
        letter-spacing: 0.5px;
    }
    
    .stat-value {
        font-size: 16px;
        font-family: var(--font-mono);
        font-weight: 600;
        color: var(--text-primary);
    }
    
    /* ============================================
        TOGGLE SWITCHES
        ============================================ */
    .toggle-group {
        display: flex;
        gap: var(--spacing-md);
        flex-wrap: wrap;
    }
    
    .toggle-item {
        display: flex;
        align-items: center;
        gap: 8px;
        cursor: pointer;
        user-select: none;
    }
    
    .toggle-switch {
        width: 44px;
        height: 24px;
        background: var(--bg-tertiary);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        position: relative;
        transition: all 0.3s ease;
    }
    
    .toggle-switch::after {
        content: '';
        position: absolute;
        width: 18px;
        height: 18px;
        background: var(--text-secondary);
        border-radius: 50%;
        top: 2px;
        left: 2px;
        transition: all 0.3s ease;
    }
    
    .toggle-item input:checked + .toggle-switch {
        background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
        border-color: var(--accent-primary);
    }
    
    .toggle-item input:checked + .toggle-switch::after {
        left: 22px;
        background: white;
    }
    
    .toggle-item input {
        display: none;
    }
    
    .toggle-label {
        font-size: 13px;
        color: var(--text-secondary);
        font-weight: 500;
    }
    
    /* ============================================
        RESPONSIVE DESIGN
        ============================================ */
    @media (max-width: 1024px) {
        .sidebar {
            width: 300px;
        }
    }
    
    @media (max-width: 768px) {
        .sidebar {
            position: absolute;
            right: -100%;
            top: 0;
            bottom: 0;
            transition: right 0.3s ease;
            z-index: 200;
        }
    
        .sidebar.active {
            right: 0;
        }
    
        .info-grid {
            grid-template-columns: 1fr;
        }
    }
    
    /* ============================================
        LOADING ANIMATION
        ============================================ */
    @keyframes pulse {
        0%, 100% {
            opacity: 1;
        }
        50% {
            opacity: 0.5;
        }
    }
    
    .loading {
        animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    }
    
    /* ============================================
        UTILITY CLASSES
        ============================================ */
    .hidden {
        display: none !important;
    }
    
    .text-center {
        text-align: center;
    }
    
    .mt-sm { margin-top: var(--spacing-sm); }
    .mt-md { margin-top: var(--spacing-md); }
    .mb-sm { margin-bottom: var(--spacing-sm); }
    .mb-md { margin-bottom: var(--spacing-md); }