/* ========== CSS VARIABLES ========== */
        :root {
            /* Main colors */
            --primary-gold: #FFC407;
            --primary-gold-dark: #e6b007;
            --primary-gold-light: #ffcf33;

            /* Dark colors */
            --dark-primary: #2c2c2c;
            --dark-secondary: #1a1a1a;

            /* Light colors */
            --white: #ffffff;
            --light-bg: #fafafa;
            --light-bg-gradient: #f8fafc;

            /* Text colors */
            --text-primary: #1f2937;
            --text-secondary: #374151;
            --text-muted: #6b7280;

            /* Status colors */
            --success-green: #4ade80;
            --error-red: #ef4444;

            /* Opacity */
            --overlay-light: rgba(255, 255, 255, 0.95);
            --overlay-dark: rgba(0, 0, 0, 0.5);
            --border-light: rgba(255, 255, 255, 0.2);
            --border-subtle: rgba(0, 0, 0, 0.05);

            /* Shadows */
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
            --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.15);
            --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.1);

            /* Radius */
            --radius-sm: 4px;
            --radius-md: 12px;
            --radius-lg: 18px;
            --radius-xl: 20px;

            /* Spacing */
            --spacing-xs: 4px;
            --spacing-sm: 8px;
            --spacing-md: 12px;
            --spacing-lg: 16px;
            --spacing-xl: 20px;
            --spacing-2xl: 25px;

            /* Fonts */
            --font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

            /* Transitions */
            --transition-fast: 0.15s ease;
            --transition-normal: 0.3s ease;
            --transition-slow: 0.5s ease;
        }

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

        body {
            font-family: var(--font-family);
            background: linear-gradient(135deg, var(--dark-primary) 0%, var(--dark-secondary) 100%);
            min-height: 100vh;
            padding: 20px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: var(--overlay-light);
            backdrop-filter: blur(20px);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-lg);
            overflow: hidden;
            border: 1px solid var(--border-light);
        }
        .header {
            background: linear-gradient(135deg, var(--primary-gold) 0%, var(--primary-gold-dark) 100%);
            color: var(--dark-secondary);
            padding: 30px;
            text-align: center;
            position: relative;
        }
        .header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
            animation: shimmer 3s infinite;
            pointer-events: none;
        }
        .header h1 {
            font-size: 28px;
            margin-bottom: 10px;
            font-weight: 600;
            position: relative;
            z-index: 1;
        }
        .header p {
            opacity: 0.9;
            font-size: 14px;
            position: relative;
            z-index: 1;
        }
        @keyframes shimmer {
            0% { transform: translateX(-100%); }
            100% { transform: translateX(100%); }
        }
        .content {
            padding: 40px;
            background: linear-gradient(180deg, var(--light-bg) 0%, var(--light-bg-gradient) 100%);
        }

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

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }

        .upload-section {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 20px;
            margin-bottom: 30px;
            box-shadow: var(--shadow-sm);
        }

        .upload-area {
            border: 3px dashed var(--primary-gold);
            border-radius: var(--radius-md);
            padding: 60px 20px;
            text-align: center;
            cursor: pointer;
            transition: all var(--transition-normal);
            background: var(--light-bg);
            margin-bottom: 20px;
        }
        .upload-area:hover {
            background: #fffbf0;
            border-color: var(--primary-gold-dark);
            transform: translateY(-2px);
        }
        .upload-area.dragover {
            background: #fff9e6;
            transform: scale(1.02);
            border-color: var(--primary-gold-dark);
        }

        #fileInput { display: none; }
        .upload-icon { font-size: 48px; margin-bottom: 15px; }

        .output-dir-section {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 20px;
            padding: 15px;
            background: white;
            border-radius: 8px;
        }

        .output-dir-section label {
            font-weight: 600;
            color: #495057;
            min-width: 120px;
        }

        #outputDir {
            flex: 1;
            padding: 10px;
            border: 2px solid #dee2e6;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-family: var(--font-family);
            transition: border-color var(--transition-fast);
        }

        #outputDir:focus {
            outline: none;
            border-color: var(--primary-gold);
        }

        .output-dir-hint {
            font-size: 12px;
            color: #6c757d;
            margin-top: 5px;
        }

        .btn {
            background: linear-gradient(135deg, var(--primary-gold), var(--primary-gold-dark));
            color: var(--dark-secondary);
            border: none;
            padding: 12px 30px;
            border-radius: var(--radius-md);
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            font-family: var(--font-family);
            transition: all var(--transition-fast);
            margin: 5px;
        }
        .btn:hover:not(:disabled) {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(255, 196, 7, 0.4);
        }
        .btn:active:not(:disabled) {
            transform: translateY(0);
        }
        .btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
        }

        .btn-small {
            padding: 8px 20px;
            font-size: 14px;
        }

        .progress-bar {
            width: 100%;
            height: 30px;
            background: #e9ecef;
            border-radius: 15px;
            overflow: hidden;
            margin: 20px 0;
            display: none;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(135deg, var(--primary-gold), var(--primary-gold-dark));
            transition: width var(--transition-normal);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--dark-secondary);
            font-weight: 600;
            font-size: 14px;
        }

        .file-list {
            margin-top: 30px;
            display: none;
        }

        .batch-toolbar {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 15px;
            margin-bottom: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 15px;
            box-shadow: var(--shadow-sm);
        }

        .batch-toolbar-left {
            display: flex;
            gap: 10px;
            align-items: center;
        }

        .batch-toolbar-right {
            display: flex;
            gap: 10px;
        }

        .btn-toolbar {
            background: #6c757d;
            color: white;
            border: none;
            padding: 8px 16px;
            border-radius: 20px;
            cursor: pointer;
            font-size: 13px;
            font-weight: 600;
            transition: transform 0.2s;
        }

        .btn-toolbar:hover {
            transform: translateY(-2px);
            background: #5a6268;
        }

        .btn-export {
            background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
        }

        .btn-export:hover {
            background: linear-gradient(135deg, #218838 0%, #1fa589 100%);
        }

        .selection-count {
            font-size: 13px;
            color: #495057;
            font-weight: 600;
        }

        .file-item {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 20px;
            margin-bottom: 20px;
            border-left: 4px solid var(--primary-gold);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-fast);
        }

        .file-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(2px);
        }

        .file-item.selected {
            background: #fffbf0;
            border-left-color: var(--success-green);
        }

        .file-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
        }

        .file-header-left {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .file-checkbox {
            width: 20px;
            height: 20px;
            cursor: pointer;
        }

        .file-name {
            font-weight: 600;
            font-size: 16px;
            color: #495057;
        }

        .file-type {
            background: linear-gradient(135deg, var(--primary-gold), var(--primary-gold-dark));
            color: var(--dark-secondary);
            padding: 4px 12px;
            border-radius: 12px;
            font-size: 12px;
            font-weight: 600;
        }

        .metadata-comparison {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .metadata-box {
            background: var(--light-bg);
            border-radius: var(--radius-sm);
            padding: 15px;
            border: 1px solid var(--border-subtle);
        }

        .metadata-box h4 {
            color: var(--primary-gold-dark);
            margin-bottom: 10px;
            font-size: 14px;
            font-weight: 600;
        }

        .metadata-item {
            display: flex;
            flex-direction: column;
            padding: 8px 0;
            border-bottom: 1px solid #dee2e6;
        }

        .metadata-item:last-child { border-bottom: none; }
        .metadata-label { font-weight: 600; color: #495057; font-size: 12px; margin-bottom: 4px; }
        .metadata-value { color: #6c757d; font-size: 13px; }

        .alert {
            padding: 15px;
            border-radius: 8px;
            margin: 15px 0;
            display: none;
        }
        .alert-error { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
        .alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
        .alert-info { background: #d1ecf1; color: #0c5460; border: 1px solid #bee5eb; }

        .actions {
            text-align: center;
            margin-top: 20px;
        }

        .spinner {
            border: 3px solid #f3f3f3;
            border-top: 3px solid var(--primary-gold);
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
            margin: 20px auto;
            display: none;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .footer {
            text-align: center;
            padding: 20px;
            color: #6c757d;
            font-size: 12px;
            border-top: 1px solid #dee2e6;
        }

        /* Metadata Source Selector */
        .metadata-source-selector {
            background: white;
            border-radius: 8px;
            padding: 15px;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .metadata-source-selector label {
            font-weight: 600;
            color: #495057;
            min-width: 140px;
        }

        .source-select {
            flex: 1;
            padding: 10px;
            border: 2px solid var(--primary-gold);
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-family: var(--font-family);
            cursor: pointer;
            background: var(--white);
            transition: border-color var(--transition-fast);
        }
        .source-select:focus {
            outline: none;
            border-color: var(--primary-gold-dark);
        }

        .source-info {
            font-size: 12px;
            color: #6c757d;
            margin-left: 10px;
        }

        /* Editable Metadata Fields */
        .editable-field {
            width: 100%;
            padding: 8px;
            border: 2px solid #dee2e6;
            border-radius: 5px;
            font-size: 13px;
            font-family: inherit;
            transition: border-color 0.3s;
        }

        .editable-field:focus {
            outline: none;
            border-color: var(--primary-gold);
            box-shadow: 0 0 0 3px rgba(255, 196, 7, 0.1);
        }

        .editable-field.invalid {
            border-color: #dc3545;
        }

        textarea.editable-field {
            min-height: 60px;
            resize: vertical;
        }

        .char-count {
            font-size: 11px;
            color: #6c757d;
            margin-top: 4px;
            display: block;
        }

        .char-count.warning {
            color: #ffc107;
        }

        .char-count.danger {
            color: #dc3545;
        }

        .metadata-field {
            margin-bottom: 15px;
        }

        .metadata-field label {
            display: block;
            font-weight: 600;
            color: #495057;
            font-size: 12px;
            margin-bottom: 5px;
        }

        /* File Action Buttons */
        .file-actions {
            display: flex;
            gap: 10px;
            margin-top: 15px;
        }

        .btn-save {
            background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
            color: white;
            border: none;
            padding: 8px 20px;
            border-radius: 20px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 600;
            transition: transform 0.2s;
        }

        .btn-save:hover {
            transform: translateY(-2px);
        }

        .btn-save:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
        }

        .btn-reset {
            background: #6c757d;
            color: white;
            border: none;
            padding: 8px 20px;
            border-radius: 20px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 600;
            transition: transform 0.2s;
        }

        .btn-reset:hover {
            transform: translateY(-2px);
            background: #5a6268;
        }

        /* Import Metadata Section */
        .import-section {
            background: white;
            border-radius: 8px;
            padding: 15px;
            margin-bottom: 15px;
            border: 2px dashed #dee2e6;
        }

        .import-section.active {
            border-color: var(--success-green);
            background: #f0fff4;
        }

        .btn-import {
            background: linear-gradient(135deg, #17a2b8 0%, #138496 100%);
            color: white;
            border: none;
            padding: 8px 20px;
            border-radius: 20px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 600;
            transition: transform 0.2s;
        }

        .btn-import:hover {
            transform: translateY(-2px);
        }

        .import-stats {
            font-size: 12px;
            color: #28a745;
            margin-top: 10px;
            padding: 8px;
            background: white;
            border-radius: 5px;
        }

        /* Template Section */
        .template-section {
            background: white;
            border-radius: 8px;
            padding: 15px;
            margin-bottom: 15px;
            border: 2px dashed #dee2e6;
        }

        .template-section.active {
            border-color: var(--primary-gold);
            background: #fffbf0;
        }

        .template-controls {
            display: flex;
            gap: 10px;
            align-items: center;
            flex-wrap: wrap;
        }

        .template-select {
            flex: 1;
            min-width: 200px;
            padding: 8px;
            border: 2px solid var(--primary-gold);
            border-radius: var(--radius-sm);
            font-size: 13px;
            font-family: var(--font-family);
            cursor: pointer;
            transition: border-color var(--transition-fast);
        }

        .template-select:focus {
            outline: none;
            border-color: var(--primary-gold-dark);
        }

        .btn-template {
            background: linear-gradient(135deg, var(--primary-gold), var(--primary-gold-dark));
            color: var(--dark-secondary);
            border: none;
            padding: 8px 16px;
            border-radius: var(--radius-md);
            cursor: pointer;
            font-size: 13px;
            font-weight: 600;
            font-family: var(--font-family);
            transition: all var(--transition-fast);
        }

        .btn-template:hover:not(:disabled) {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(255, 196, 7, 0.3);
        }

        .btn-template:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
        }

        .template-preview {
            margin-top: 10px;
            padding: 10px;
            background: white;
            border-radius: 5px;
            font-size: 12px;
            color: #495057;
            display: none;
        }

        .template-preview-item {
            margin-bottom: 5px;
        }

        .template-preview-label {
            font-weight: 600;
            color: var(--primary-gold-dark);
        }

        /* Modal Styles */
        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.5);
        }

        .modal-content {
            background-color: white;
            margin: 5% auto;
            padding: 30px;
            border-radius: 15px;
            width: 90%;
            max-width: 600px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .modal-header h3 {
            color: var(--primary-gold-dark);
            margin: 0;
            font-weight: 600;
        }

        .close-modal {
            font-size: 28px;
            font-weight: bold;
            color: #aaa;
            cursor: pointer;
        }

        .close-modal:hover {
            color: #000;
        }

        .form-group {
            margin-bottom: 15px;
        }

        .form-group label {
            display: block;
            font-weight: 600;
            color: #495057;
            margin-bottom: 5px;
            font-size: 13px;
        }

        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 10px;
            border: 2px solid #dee2e6;
            border-radius: var(--radius-sm);
            font-size: 13px;
            font-family: var(--font-family);
            transition: border-color var(--transition-fast);
        }

        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--primary-gold);
            box-shadow: 0 0 0 3px rgba(255, 196, 7, 0.1);
        }

        .form-group textarea {
            min-height: 60px;
            resize: vertical;
        }

        .form-group small {
            font-size: 11px;
            color: #6c757d;
            margin-top: 3px;
            display: block;
        }

        .variable-hint {
            background: #fffbf0;
            padding: 8px;
            border-radius: var(--radius-sm);
            font-size: 11px;
            color: var(--primary-gold-dark);
            margin-top: 5px;
            border: 1px solid rgba(255, 196, 7, 0.2);
        }

        @media (max-width: 768px) {
            .metadata-comparison {
                grid-template-columns: 1fr;
            }
            .metadata-source-selector {
                flex-direction: column;
                align-items: flex-start;
            }
            .metadata-source-selector label {
                min-width: auto;
            }
        }