/* ============================================
    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;
    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-md) var(--spacing-lg);
    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;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo {
    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); }