:root {
            --primary-color: #2c7da0;
            --secondary-color: #a9d6e5;
            --accent-color: #01497c;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --success-color: #28a745;
            --warning-color: #ffc107;
            --math-color: #6f42c1;
            --calc-color: #e83e8c;
        }
        .page-header {
            background: linear-gradient(135deg, rgba(169, 214, 229, 0.4) 0%, rgba(44, 125, 160, 0.4) 100%);
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid rgba(44, 125, 160, 0.2);
            position: relative;
            overflow: hidden;  color: var(--text-color);
        }
        .breadcrumb {
            background-color: transparent;
            padding: 0.5rem 0;
            margin-bottom: 0.5rem;
        }
        .breadcrumb-item a {
            color: var(--text-muted);
            text-decoration: none;
        }
        .breadcrumb-item.active {
            color: var(--text-color);
        }
        .image-preview-container {
            background: white;
            border-radius: 8px;
            padding: 1rem;
            border: 1px solid var(--border-color);
            margin-bottom: 1.5rem;
            text-align: center;
        }
        .image-preview {
            max-width: 100%;
            max-height: 300px;
            border-radius: 4px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }
        .canvas-preview {
            max-width: 100%;
            max-height: 300px;
            border-radius: 4px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
            background: #f0f0f0;
            display: block;
            margin: 0 auto;
        }
        .image-stats {
            margin-top: 0.5rem;
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .download-btn {
            margin-top: 1rem;
        }
        .slider-label {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .slider-value {
            background: var(--primary-color);
            color: white;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.9rem;
        }
        .example-gallery {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
            margin: 1rem 0;
        }
        .example-gallery img {
            width: 80px;
            height: 80px;
            object-fit: cover;
            border-radius: 4px;
            cursor: pointer;
            border: 2px solid transparent;
            transition: all 0.2s;
            background: #f0f0f0;
        }
        .example-gallery img:hover {
            border-color: var(--primary-color);
            transform: scale(1.05);
        }
        .social-icons a {
            display: inline-block;
            width: 36px;
            height: 36px;
            background: white;
            border-radius: 50%;
            text-align: center;
            line-height: 36px;
            margin-right: 0.5rem;
            color: var(--primary-color);
            border: 1px solid var(--border-color);
            transition: all 0.3s;
        }
        .social-icons a:hover {
            background: var(--primary-color);
            color: white;
        }
        @media (max-width: 768px) {
            }
        .ad-placeholder-large {
            height: 600px;
        }
        .quick-tip-item {
            display: flex;
            align-items: center;
            padding: 0.75rem 0;
            border-bottom: 1px dashed var(--border-color);
        }
        .quick-tip-item:last-child {
            border-bottom: none;
        }
        .quick-tip-icon {
            width: 24px;
            color: var(--warning-color);
            margin-right: 0.75rem;
        }
        .form-check-input:checked {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }