:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #34495e;
    --success-color: #2ecc71;
    --border-radius: 8px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    color: var(--secondary-color);
    margin-bottom: 10px;
}

header p {
    color: var(--dark-color);
    font-size: 1.1em;
}

.main-content {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 40px;
}

.upload-section {
    flex: 1 1 300px;
}

.controls-section {
    flex: 1 1 500px;
}

h2 {
    margin-bottom: 20px;
    color: var(--secondary-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
}

h3 {
    margin: 15px 0 10px;
    color: var(--secondary-color);
}

.upload-area {
    border: 2px dashed var(--primary-color);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    transition: var(--transition);
    background-color: var(--light-color);
    margin-bottom: 20px;
}

.upload-area:hover {
    border-color: var(--accent-color);
}

.upload-button {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    margin-top: 15px;
}

.upload-button:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

#imageUpload {
    display: none;
}

.preview-container {
    margin-top: 20px;
    max-width: 100%;
    overflow: hidden;
}

#imagePreview {
    max-width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.hidden {
    display: none;
}

.options {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.options label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 10px;
    background-color: white;
    border-radius: var(--border-radius);
    border: 1px solid #ddd;
    transition: var(--transition);
    min-width: 120px;
}

.options label:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.options input[type="radio"] {
    margin-right: 10px;
}

.options input[type="radio"]:checked + span {
    font-weight: bold;
    color: var(--primary-color);
}

.template-grid {
    display: grid;
    gap: 1px;
    width: fit-content;
    margin: 15px 0;
    background-color: #ccc;
    border: 1px solid #999;
}

.grid-cell {
    width: 20px;
    height: 20px;
    background-color: white;
}

.grid-cell.active {
    background-color: var(--dark-color);
}

.apply-button {
    display: block;
    width: 100%;
    padding: 15px;
    background-color: var(--success-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 30px;
}

.apply-button:hover {
    background-color: #27ae60;
    transform: translateY(-2px);
}

.apply-button:disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
    transform: none;
}

.result-section {
    margin-top: 40px;
}

.result-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.image-container {
    flex: 1 1 400px;
    text-align: center;
    padding: 15px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

canvas {
    max-width: 100%;
    border: 1px solid #ddd;
}

@media (max-width: 768px) {
    .main-content, .result-container {
        flex-direction: column;
    }
    
    .options {
        flex-direction: column;
    }
    
    .options label {
        width: 100%;
    }
}

.template-selection, .operation-selection {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}