:root {
    --canva-purple: #8b5cf6;
    --canva-purple-light: #a78bfa;
    --canva-blue: #3b82f6;
    --canva-green: #10b981;
    --canva-orange: #f59e0b;
    --canva-red: #ef4444;
    --canva-gray-100: #f3f4f6;
    --canva-gray-200: #e5e7eb;
    --canva-gray-800: #1f2937;
    --canva-gray-900: #111827;
}

/* Base Styles */
body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Main Layout */
.main-container {
    background: white;
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    margin: 2rem auto;
    overflow: hidden;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--canva-purple) 0%, var(--canva-blue) 100%);
    color: white;
    padding: 2rem;
    text-align: center;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Upload Area */
.upload-area {
    background: var(--canva-gray-100);
    border: 3px dashed var(--canva-purple);
    border-radius: 20px;
    padding: 3rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    margin: 2rem;
}

.upload-area:hover,
.upload-area.dragover {
    background: #f0f4ff;
    border-color: var(--canva-blue);
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.15);
}

.upload-icon {
    font-size: 4rem;
    color: var(--canva-purple);
    margin-bottom: 1rem;
}

/* Buttons */
.btn-canva {
    background: linear-gradient(135deg, var(--canva-purple) 0%, var(--canva-blue) 100%);
    border: none;
    color: white;
    border-radius: 12px;
    padding: 1rem 2rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 14px 0 rgba(139, 92, 246, 0.3);
}

.btn-canva:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px 0 rgba(139, 92, 246, 0.4);
    color: white;
}

.btn-success {
    background: linear-gradient(135deg, var(--canva-green) 0%, #059669 100%);
    box-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.3);
}

.btn-warning {
    background: linear-gradient(135deg, var(--canva-orange) 0%, #d97706 100%);
    box-shadow: 0 4px 14px 0 rgba(245, 158, 11, 0.3);
}

/* Layout Components */
.side-panel {
    background: var(--canva-gray-100);
    padding: 2rem;
    border-radius: 16px;
    margin: 1rem;
}

.workspace {
    background: #f8fafc;
    border-radius: 16px;
    padding: 2rem;
    margin: 1rem;
    min-height: 600px;
}

/* Canvas */
.canvas-container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.interactive-canvas {
    border-radius: 8px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    cursor: grab;
    background: white;
}

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

/* Tool Groups */
.tool-group {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.tool-group h4 {
    color: var(--canva-gray-800);
    font-weight: 700;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Preset Grid */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

.preset-btn {
    background: white;
    border: 2px solid var(--canva-gray-200);
    border-radius: 8px;
    padding: 0.75rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--canva-gray-800);
    transition: all 0.2s ease;
    cursor: pointer;
}

.preset-btn:hover {
    border-color: var(--canva-purple);
    color: var(--canva-purple);
    transform: translateY(-1px);
}

/* Image Gallery */
.image-gallery {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.image-thumbnail {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 8px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

.image-thumbnail.active {
    border-color: var(--canva-purple);
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.2);
}

.image-thumbnail:hover {
    transform: scale(1.05);
}

/* Controls */
.control-panel {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.slider-group {
    margin: 1rem 0;
}

.slider-group label {
    font-weight: 600;
    color: var(--canva-gray-800);
    font-size: 0.9rem;
}

.range-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--canva-gray-200);
    outline: none;
    -webkit-appearance: none;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--canva-purple);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(139, 92, 246, 0.3);
}

/* Info Bar */
.info-bar {
    background: var(--canva-gray-800);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

/* Progress Overlay */
.progress-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.progress-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    min-width: 300px;
}

.progress-ring {
    width: 80px;
    height: 80px;
    margin: 0 auto 1rem;
}

/* Batch Actions */
.batch-actions {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 2px solid var(--canva-blue);
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .columns {
        margin: 0 !important;
    }
    
    .column {
        padding: 0.5rem !important;
    }
    
    .main-container {
        margin: 1rem;
        border-radius: 16px;
    }
    
    .preset-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}