:root {
            --primary-color: #2563eb;
            --secondary-color: #3b82f6;
            --background-color: #f8fafc;
            --text-color: #1e293b;
            --border-radius: 12px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--background-color);
            color: var(--text-color);
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }


        .header-content {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.5rem 2rem;
            position: relative;
        }

        header h1 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
        }

        nav {
            display: flex;
            gap: 2rem;
        }

        /* Navigation dropdown styles */
        .nav-item {
            position: relative;
        }

        .dropdown-toggle::after {
            content: " ▼";
            font-size: 0.7rem;
            margin-left: 0.3rem;
        }

        .dropdown-menu {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
            padding: 0.5rem 0;
            min-width: 180px;
            z-index: 1000;
        }

        .dropdown-menu a {
            display: block;
            padding: 0.5rem 1rem;
            color: var(--text-color);
            text-decoration: none;
            font-weight: 400;
            border-radius: 0;
            transition: background-color 0.2s;
        }

        .dropdown-menu a:hover {
            background-color: #f1f5f9;
            color: var(--primary-color);
        }

        .nav-item:hover .dropdown-menu {
            display: block;
        }

        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 4px;
            cursor: pointer;
            padding: 5px;
        }

        .menu-toggle span {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--primary-color);
            transition: var(--transition);
        }

        nav a {
            color: var(--text-color);
            text-decoration: none;
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }

        nav a:hover {
            background-color: var(--primary-color);
            color: white;
        }

        main {
            margin-top: 6rem;
            padding: 2rem;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            width: 100%;
            flex: 1;
        }

        .content-section {
            padding: 2rem;
            border-radius: var(--border-radius);
            box-shadow: 0 4px 6px rgb(0, 0, 0);
            margin-bottom: 2rem;
        }

        .content-section h2 {
            color: var(--primary-color);
            font-size: 2rem;
            margin-bottom: 1rem;
            text-align: center;
        }

        .content-section p {
            color: #64748b;
            text-align: center;
            max-width: 600px;
            margin: 0 auto 2rem;
        }

        .warning {
            display: inline-block;
            padding: 0.75rem 1.5rem;
            background-color: #fee2e2;
            color: #991b1b;
            border-radius: var(--border-radius);
            font-weight: 500;
            margin: 1rem auto;
            display: block;
            width: fit-content;
        }

        .important-notice {
            padding: 0.75rem 1.5rem;
            background-color: #e0f7fa;
            color: #006064;
            border-radius: var(--border-radius);
            font-weight: 500;
            margin: 1rem auto 1.5rem;
            display: block;
            width: fit-content;
            border-left: 4px solid #0097a7;
            text-align: center;
            max-width: 90%;
        }

        #upload-form {
            max-width: 800px;
            margin: 0 auto;
            text-align: center;
        }

        .file-input-container {
            margin-bottom: 1.5rem;
        }

        input[type="file"] {
            display: none;
        }

        .file-input-label {
            display: inline-block;
            padding: 0.75rem 2rem;
            background-color: var(--primary-color);
            color: white;
            border-radius: var(--border-radius);
            cursor: pointer;
            transition: var(--transition);
            font-weight: 500;
        }

        .file-input-label:hover {
            background-color: var(--secondary-color);
            transform: translateY(-1px);
        }

        button {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 0.75rem 2rem;
            border-radius: var(--border-radius);
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
        }

        button:hover {
            background-color: var(--secondary-color);
            transform: translateY(-1px);
        }

        #upload-result {
            margin-top: 2rem;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

        .output_canvas {
            max-width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            display: block;
            margin: 0 auto;
        }

        .output {
            background-color: rgba(0, 127, 139, 0.9);
            color: white;
            padding: 1rem;
            border-radius: var(--border-radius);
            margin-top: 1rem;
            font-weight: 500;
        }

        #loading-indicator {
            padding: 1rem;
            color: var(--primary-color);
            font-weight: 500;
        }

        #upload-text {
            margin-top: 1rem;
            padding: 0.75rem 1.5rem;
            background-color: #e0f2fe;
            color: #0369a1;
            border-radius: var(--border-radius);
            font-weight: 500;
            display: block;
            text-align: center;
            border-left: 4px solid var(--primary-color);
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .format-info {
            font-size: 0.85rem;
            color: #64748b;
            margin-top: 0.5rem;
            text-align: center;
        }

        

        @media (max-width: 768px) {
            .header-content {
                flex-direction: row;
                align-items: center;
                justify-content: space-between;
                padding: 0.5rem 2rem;
            }

            .menu-toggle {
                display: flex;
                order: 2;
            }

            nav {
                display: none;
                position: absolute;
                top: 100%;
                right: 0;
                width: 200px;
                background-color: white;
                flex-direction: column;
                padding: 1rem;
                box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
                gap: 0.5rem;
                border-radius: 0 0 var(--border-radius) var(--border-radius);
            }

            nav.active {
                display: flex;
            }

            nav a {
                width: 100%;
                text-align: left;
                padding: 0.75rem 1rem;
            }

            main {
                padding: 1rem;
            }

            .content-section {
                padding: 1.5rem;
            }
        }

        /* Model Selector Styles */
        .model-selection-section {
            margin: 1.5rem 0;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            box-shadow: 0 1px 3px rgb(0, 0, 0);
        }

        .model-selector-wrapper {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .model-selector-label {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 600;
            font-size: 1.1rem;
            color: #ffffff;
        }

        .model-icon {
            font-size: 1.2rem;
        }

        .model-selector {
            padding: 0.75rem 1rem;
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            font-size: 1rem;
            background-color: white;
            color: var(--text-color);
            transition: var(--transition);
            cursor: pointer;
        }

        .model-selector:hover {
            border-color: var(--primary-color);
        }

        .model-selector:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }

        .model-info {
            display: flex;
            align-items: flex-start;
            gap: 0.5rem;
            padding: 0.75rem;
            background-color: #f1f5f9;
            border-radius: 6px;
            font-size: 0.9rem;
            color: #64748b;
        }

        .info-icon {
            font-size: 1rem;
            margin-top: 0.1rem;
        }

        @media (max-width: 768px) {
            .model-selection-section {
                margin: 1rem 0;
                padding: 1rem;
            }
            
            .model-selector-label {
                font-size: 1rem;
            }
            
            .model-selector {
                font-size: 0.9rem;
            }
        }