* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --success-color: #10b981;
    --success-hover: #059669;
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --border-color: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --drop-zone-bg: #1e293b;
    --drop-zone-hover: #334155;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 3rem;
    font-weight: 800;
    /*  background: linear-gradient(135deg, var(--primary-color), var(--success-color)); */
    /*  -webkit-background-clip: text;  */
    /*  -webkit-text-fill-color: transparent;  */
    background-clip: text;
    margin-bottom: 0.5rem;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Drop Zone */
.input-section {
    margin-bottom: 2rem;
}

.drop-zone {
    border: 3px dashed var(--border-color);
    border-radius: 1rem;
    padding: 3rem;
    text-align: center;
    background: var(--drop-zone-bg);
    transition: all 0.3s ease;
    cursor: pointer;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--primary-color);
    background: var(--drop-zone-hover);
    transform: translateY(-2px);
}

.drop-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--text-secondary);
}

.drop-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    background: var(--success-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
    background: var(--surface-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

/* Processing Section */
.processing-section {
    animation: fadeIn 0.3s ease;
}

.processing-section.hidden {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Controls Panel */
.controls-panel {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: end;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 200px;
}

.control-group label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.control-group select,
.control-group input[type="range"] {
    padding: 0.5rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
}

.control-group select {
    cursor: pointer;
}

.control-group input[type="range"] {
    cursor: pointer;
    accent-color: var(--primary-color);
}

#customColorGroup.hidden {
    display: none;
}

/* Comparison Container */
.comparison-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.image-panel {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.5rem;
}

.image-panel h3 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.size-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.canvas-wrapper {
    background: repeating-conic-gradient(#1e293b 0% 25%, #334155 0% 50%) 50% / 20px 20px;
    border-radius: 0.5rem;
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
    overflow: auto;
}

canvas {
    max-width: 100%;
    height: auto;
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
    border-radius: 4px;
}

.detection-info {
    margin-top: 1rem;
    padding: 0.75rem;
    background: var(--bg-color);
    border-radius: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Footer */
footer {
    margin-top: 4rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    header h1 {
        font-size: 2rem;
    }

    .comparison-container {
        grid-template-columns: 1fr;
    }

    .controls-panel {
        flex-direction: column;
        align-items: stretch;
    }

    .control-group {
        min-width: 100%;
    }
}