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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 40px;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 600;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.upload-section {
    padding: 40px;
}

.drop-zone {
    border: 3px dashed #ddd;
    border-radius: 12px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    background: #fafafa;
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: #667eea;
    background: #f0f4ff;
    transform: translateY(-2px);
}

.drop-content svg {
    color: #667eea;
    margin-bottom: 20px;
}

.drop-content h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #2c3e50;
}

.drop-content p {
    color: #666;
    margin-bottom: 5px;
}

.file-types {
    font-size: 0.9rem;
    color: #999;
}

#imageInput {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    pointer-events: none;
}

.color-section {
    margin: 30px 0;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.color-section label {
    font-weight: 500;
    color: #2c3e50;
}

#svgColor {
    width: 50px;
    height: 40px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

#generateBtn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

#generateBtn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

#generateBtn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-loading {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-loading::after {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.preview-section {
    padding: 0 40px 20px;
}

.preview-section h3 {
    margin-bottom: 15px;
    color: #2c3e50;
}

#previewImage {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.info-section {
    padding: 40px;
    background: #f8f9fa;
}

.info-section h3 {
    margin-bottom: 20px;
    color: #2c3e50;
    font-size: 1.3rem;
}

.file-list {
    display: grid;
    gap: 12px;
}

.file-item {
    padding: 12px 16px;
    background: white;
    border-radius: 6px;
    border-left: 4px solid #667eea;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.file-item strong {
    color: #2c3e50;
}

@media (max-width: 600px) {
    body {
        padding: 10px;
    }
    
    header {
        padding: 30px 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .upload-section {
        padding: 30px 20px;
    }
    
    .drop-zone {
        padding: 40px 15px;
    }
    
    .info-section {
        padding: 30px 20px;
    }
}