:root {
            --primary-bg: #1e1e1e;
            --secondary-bg: #252526;
            --header-bg: #333333;
            --border-color: #4a4a4a;
            --text-color: #e0e0e0;
            --accent-color: #007acc;
            --accent-hover: #0098e6;
            --success-color: #4CAF50;
            --warning-color: #ff9800;
            --error-color: #f44336;
            --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --z-modal: 1000;
            --z-settings: 900;
            --z-dropdown: 800;
            --z-notification: 1100;
        }

        *, *::before, *::after {
            box-sizing: border-box;
        }

        body, html {
            margin: 0;
            padding: 0;
            height: 100%;
            font-family: var(--font-family);
            background-color: var(--primary-bg);
            color: var(--text-color);
            overflow: hidden;
        }

        .main-container {
            display: flex;
            flex-direction: column;
            height: 100vh;
        }

        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: var(--header-bg);
            padding: 10px 20px;
            border-bottom: 1px solid var(--border-color);
            flex-wrap: wrap;
            gap: 10px;
        }

        .header h1 {
            margin: 0;
            font-size: 1.4em;
            color: #ffffff;
        }

        .controls-container {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .button-row {
            display: flex;
            gap: 8px;
            justify-content: flex-end;
        }
        
        .btn {
            background-color: var(--secondary-bg);
            color: var(--text-color);
            border: 1px solid var(--border-color);
            padding: 8px 15px;
            border-radius: 5px;
            cursor: pointer;
            font-size: 0.9em;
            font-weight: 500;
            transition: all 0.2s;
            display: flex;
            align-items: center;
            gap: 5px;
            white-space: nowrap;
            position: relative;
        }

        .btn:hover {
            background-color: #4d4d4d;
        }

        .btn.primary {
            background-color: var(--accent-color);
            border-color: var(--accent-color);
            color: white;
        }

        .btn.primary:hover {
            background-color: var(--accent-hover);
        }

        .btn.success {
            background-color: var(--success-color);
            border-color: var(--success-color);
            color: white;
        }

        .btn.success:hover {
            background-color: #43a047;
        }

        .btn.dropdown-toggle::after {
            content: "▼";
            font-size: 0.6em;
            margin-left: 5px;
        }

        .content-wrapper {
            display: flex;
            flex-direction: column;
            flex-grow: 1;
            overflow: hidden;
        }

        .tab-nav {
            display: none;
            background-color: var(--header-bg);
        }

        .tab-nav .tab-btn {
            padding: 12px 15px;
            background: none;
            border: none;
            color: var(--text-color);
            font-size: 1em;
            cursor: pointer;
            border-bottom: 3px solid transparent;
            position: relative;
        }
        
        .tab-nav .tab-btn.active {
            color: white;
            border-bottom: 3px solid var(--accent-color);
        }

        .editor-container {
            display: flex;
            flex-direction: column;
            flex-grow: 1;
        }

        .editor-box {
            flex: 1;
            position: relative;
            display: flex;
            flex-direction: column;
            min-height: 100px;
            border-bottom: 1px solid var(--border-color);
        }
        
        .editor-box:last-child {
            border-bottom: none;
        }

        .editor-title {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: var(--secondary-bg);
            padding: 5px 12px;
            font-weight: bold;
            font-size: 0.9em;
        }
        
        .editor-title .copy-btn {
            background: #555;
            color: white;
            border: none;
            padding: 3px 8px;
            font-size: 0.8em;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.2s;
        }

        .editor-instance-container {
            flex-grow: 1;
            position: relative;
        }

        .editor-instance {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
        }

        .status-bar {
            background-color: var(--secondary-bg);
            padding: 5px 10px;
            font-size: 0.8em;
            display: flex;
            justify-content: space-between;
            border-top: 1px solid var(--border-color);
        }

        .status-item {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .status-indicator {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background-color: var(--success-color);
        }

        .status-indicator.warning {
            background-color: var(--warning-color);
        }

        .status-indicator.error {
            background-color: var(--error-color);
        }
        
        /* Modal Styles */
        .modal {
            display: none;
            position: fixed;
            z-index: var(--z-modal);
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            background-color: rgba(0,0,0,0.7);
            animation: fadeIn 0.3s;
        }
        
        .modal-content {
            background-color: var(--primary-bg);
            margin: 2% auto;
            border: 1px solid var(--border-color);
            width: 95%;
            height: 95%;
            max-width: 1200px;
            border-radius: 8px;
            display: flex;
            flex-direction: column;
        }
        
        .modal-header {
            padding: 10px 20px;
            background: var(--header-bg);
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid var(--border-color);
        }
        .modal-header h2 {
            margin: 0;
            font-size: 1.2em;
        }

        .close-button {
            color: #aaa;
            font-size: 28px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.2s;
        }
        .close-button:hover {
            color: white;
        }
        
        .modal-body {
            flex-grow: 1;
            padding: 0;
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .modal-body iframe {
            width: 100%;
            height: 100%;
            border: none;
            background-color: #ffffff;
        }

        .preview-controls {
            padding: 8px 15px;
            background: var(--secondary-bg);
            border-bottom: 1px solid var(--border-color);
            display: flex;
            gap: 10px;
        }

        .preview-controls .btn {
            padding: 5px 10px;
            font-size: 0.8em;
        }

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

        /* Settings Panel */
        .settings-panel {
            position: fixed;
            top: 0;
            right: -350px;
            width: 350px;
            height: 100%;
            background-color: var(--secondary-bg);
            border-left: 1px solid var(--border-color);
            z-index: var(--z-settings);
            transition: right 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .settings-panel.open {
            right: 0;
        }

        .settings-header {
            padding: 15px;
            background: var(--header-bg);
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid var(--border-color);
        }

        .settings-body {
            flex-grow: 1;
            overflow-y: auto;
            padding: 15px;
        }

        .settings-group {
            margin-bottom: 20px;
        }

        .settings-group h3 {
            margin-top: 0;
            margin-bottom: 15px;
            font-size: 1.1em;
            color: var(--accent-color);
        }

        .setting-item {
            margin-bottom: 15px;
        }

        .setting-item label {
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
        }

        .setting-item .switch {
            position: relative;
            display: inline-block;
            width: 50px;
            height: 24px;
        }

        .setting-item .switch input {
            opacity: 0;
            width: 0;
            height: 0;
        }

        .setting-item .slider {
            position: absolute;
            cursor: pointer;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: #555;
            transition: .4s;
            border-radius: 24px;
        }

        .setting-item .slider:before {
            position: absolute;
            content: "";
            height: 16px;
            width: 16px;
            left: 4px;
            bottom: 4px;
            background-color: white;
            transition: .4s;
            border-radius: 50%;
        }

        .setting-item input:checked + .slider {
            background-color: var(--accent-color);
        }

        .setting-item input:checked + .slider:before {
            transform: translateX(26px);
        }

        .settings-footer {
            padding: 15px;
            border-top: 1px solid var(--border-color);
            text-align: right;
        }

        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.5);
            z-index: var(--z-settings);
            display: none;
        }

        .overlay.active {
            display: block;
        }

        /* Dropdown Menu */
        .dropdown {
            position: relative;
            display: inline-block;
        }

        .dropdown-menu {
            display: none;
            position: absolute;
            right: 0;
            background-color: var(--secondary-bg);
            min-width: 200px;
            box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
            z-index: var(--z-dropdown);
            border-radius: 5px;
            border: 1px solid var(--border-color);
            overflow: hidden;
        }

        .dropdown-menu.show {
            display: block;
        }

        .dropdown-item {
            color: var(--text-color);
            padding: 10px 15px;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
            font-size: 0.9em;
        }

        .dropdown-item:hover {
            background-color: #4d4d4d;
        }

        .dropdown-divider {
            height: 1px;
            background-color: var(--border-color);
            margin: 5px 0;
        }

        /* Loading indicator */
        .loading {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.7);
            z-index: 2000;
            display: flex;
            justify-content: center;
            align-items: center;
            flex-direction: column;
            gap: 15px;
        }

        .loading-spinner {
            width: 50px;
            height: 50px;
            border: 5px solid rgba(255,255,255,0.3);
            border-radius: 50%;
            border-top-color: var(--accent-color);
            animation: spin 1s ease-in-out infinite;
        }

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

        /* Tooltip */
        .tooltip {
            position: relative;
            display: inline-block;
        }

        .tooltip .tooltiptext {
            visibility: hidden;
            width: 120px;
            background-color: #555;
            color: #fff;
            text-align: center;
            border-radius: 6px;
            padding: 5px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            margin-left: -60px;
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.8em;
        }

        .tooltip .tooltiptext::after {
            content: "";
            position: absolute;
            top: 100%;
            left: 50%;
            margin-left: -5px;
            border-width: 5px;
            border-style: solid;
            border-color: #555 transparent transparent transparent;
        }

        .tooltip:hover .tooltiptext {
            visibility: visible;
            opacity: 1;
        }

        /* Notification */
        .notification {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background-color: var(--secondary-bg);
            color: white;
            padding: 15px;
            border-radius: 5px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
            z-index: var(--z-notification);
            display: flex;
            align-items: center;
            gap: 10px;
            transform: translateY(100px);
            opacity: 0;
            transition: all 0.3s ease;
            max-width: 300px;
        }

        .notification.show {
            transform: translateY(0);
            opacity: 1;
        }

        .notification.success {
            border-left: 4px solid var(--success-color);
        }

        .notification.error {
            border-left: 4px solid var(--error-color);
        }

        .notification.warning {
            border-left: 4px solid var(--warning-color);
        }

        .notification.info {
            border-left: 4px solid var(--accent-color);
        }

        .notification-close {
            margin-left: auto;
            cursor: pointer;
            font-weight: bold;
        }

        /* Developer Modal */
        .dev-modal {
            display: none;
            position: fixed;
            z-index: var(--z-modal);
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0,0,0,0.7);
        }

        .dev-modal-content {
            background-color: var(--primary-bg);
            margin: 5% auto;
            padding: 20px;
            border: 1px solid var(--border-color);
            width: 80%;
            max-width: 600px;
            border-radius: 8px;
            animation: modalFadeIn 0.3s;
        }

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

        .dev-modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-color);
        }

        .dev-modal-header h2 {
            margin: 0;
            color: var(--accent-color);
        }

        .dev-modal-body {
            line-height: 1.6;
        }

        .dev-modal-footer {
            margin-top: 20px;
            text-align: right;
        }

        .social-link {
            display: inline-block;
            margin-top: 15px;
            padding: 8px 15px;
            background-color: var(--accent-color);
            color: white;
            text-decoration: none;
            border-radius: 5px;
            transition: background-color 0.3s;
        }

        .social-link:hover {
            background-color: var(--accent-hover);
        }

        /* Shortcut Bar */
        .shortcut-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background-color: var(--header-bg);
            padding: 8px 15px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            z-index: 800;
            border-top: 1px solid var(--border-color);
        }

        .shortcut-group {
            display: flex;
            gap: 10px;
        }

        .shortcut-btn {
            background-color: var(--secondary-bg);
            color: var(--text-color);
            border: 1px solid var(--border-color);
            padding: 5px 10px;
            border-radius: 4px;
            cursor: pointer;
            font-size: 0.8em;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .shortcut-btn:hover {
            background-color: #4d4d4d;
        }

        .shortcut-key {
            background-color: var(--primary-bg);
            padding: 2px 5px;
            border-radius: 3px;
            font-family: monospace;
        }

        /* Demo Templates Dropdown */
        .demo-dropdown {
            position: relative;
            display: inline-block;
        }

        .demo-menu {
            display: none;
            position: absolute;
            right: 0;
            background-color: var(--secondary-bg);
            min-width: 250px;
            max-height: 400px;
            overflow-y: auto;
            box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
            z-index: var(--z-dropdown);
            border-radius: 5px;
            border: 1px solid var(--border-color);
        }

        .demo-menu.show {
            display: block;
        }

        .demo-category {
            padding: 8px 15px;
            font-weight: bold;
            background-color: var(--header-bg);
            border-bottom: 1px solid var(--border-color);
        }

        .demo-item {
            padding: 10px 15px;
            cursor: pointer;
            border-bottom: 1px solid var(--border-color);
        }

        .demo-item:hover {
            background-color: #4d4d4d;
        }

        .demo-item:last-child {
            border-bottom: none;
        }

        /* Mobile Responsive Design */
        @media (max-width: 768px) {
            .header {
                padding: 10px;
                flex-direction: column;
                align-items: flex-start;
            }
            .header h1 {
                font-size: 1.2em;
                margin-bottom: 10px;
            }
            .controls-container {
                width: 100%;
            }
            .button-row {
                justify-content: space-between;
                width: 100%;
            }
            .btn {
                padding: 6px 10px;
                font-size: 0.8em;
                flex-grow: 1;
                justify-content: center;
            }
            .tab-nav {
                display: flex;
            }
            .editor-title {
                display: none;
            }
            .editor-box {
                display: none;
                border-bottom: none;
            }
            .editor-box.active-editor {
                display: flex;
            }
            .modal-content {
                width: 100%;
                height: 100%;
                margin: 0;
                border-radius: 0;
            }
            .settings-panel {
                width: 90%;
                right: -90%;
            }
            .dropdown-menu {
                min-width: 150px;
            }
            .shortcut-bar {
                flex-direction: column;
                gap: 5px;
                padding: 5px;
            }
            .shortcut-group {
                flex-wrap: wrap;
                justify-content: center;
            }
            .shortcut-btn {
                padding: 3px 6px;
                font-size: 0.7em;
            }
        }