:root {
            /* Light theme colors (Material Design 3 inspired) */
            --md-primary: #6750a4;
            --md-primary-container: #e9ddff;
            --md-on-primary: #ffffff;
            --md-on-primary-container: #23005c;
            --md-secondary: #625b71;
            --md-secondary-container: #e8def8;
            --md-on-secondary: #ffffff;
            --md-on-secondary-container: #1d192b;
            --md-tertiary: #7d5260;
            --md-tertiary-container: #ffd8e4;
            --md-on-tertiary: #ffffff;
            --md-error: #ba1a1a;
            --md-error-container: #ffdad6;
            --md-on-error: #ffffff;
            --md-background: #fef7ff;
            --md-on-background: #1c1b1f;
            --md-surface: #ffffff;
            --md-surface-variant: #e7e0ec;
            --md-on-surface: #1c1b1f;
            --md-on-surface-variant: #49454f;
            --md-outline: #79747e;
            --md-outline-variant: #cac4d0;
            --md-surface-container-lowest: #ffffff;
            --md-surface-container-low: #f7f2fa;
            --md-surface-container: #f3edf7;
            --md-surface-container-high: #ede6f0;
            --md-surface-container-highest: #e8e0e5;
            --md-shadow: rgba(0, 0, 0, 0.15);
            --md-scrim: rgba(0, 0, 0, 0.4);
            
            /* Compatibility variables */
            --primary-color: var(--md-primary);
            --primary-hover: #5a3d99;
            --primary-pressed: #4e3286;
            --danger-color: var(--md-error);
            --border-color: var(--md-outline-variant);
            --bg-color: var(--md-background);
            --text-color: var(--md-on-background);
            --disabled-bg: #e6e6e6;
            --disabled-text: #999999;
        }

        * { 
            box-sizing: border-box; 
            margin: 0; 
            padding: 0; 
        }
        
        body { 
            font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Ubuntu, Cantarell, sans-serif; 
            background: linear-gradient(135deg, var(--md-background) 0%, var(--md-surface-container-low) 100%);
            color: var(--text-color); 
            line-height: 1.6; 
            min-height: 100vh;
            transition: all 0.3s ease;
        }
        
        .container { 
            max-width: 1400px; 
            margin: 0 auto; 
            padding: 24px; 
        }
        
        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 32px;
            background: var(--md-surface);
            padding: 20px 24px;
            border-radius: 16px;
            box-shadow: 0 2px 8px var(--md-shadow);
            border: 1px solid var(--md-outline-variant);
        }
        
        .header h1 { 
            background: linear-gradient(135deg, var(--md-primary), var(--md-tertiary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-size: 2rem;
            font-weight: 600;
            margin: 0;
        }
        
        .main-layout { 
            display: grid; 
            grid-template-columns: 400px 1fr; 
            gap: 24px; 
            align-items: start;
        }
        
        .group-box {
            background: var(--md-surface);
            border: 1px solid var(--md-outline-variant);
            border-radius: 16px;
            padding: 24px;
            margin-bottom: 20px;
            box-shadow: 0 4px 12px var(--md-shadow);
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
        }
        
        .group-box:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px var(--md-shadow);
        }
        .group-box h3 { 
            font-weight: 600; 
            margin-bottom: 20px; 
            color: var(--md-on-surface);
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        button {
            background: var(--md-primary);
            border: none;
            color: var(--md-on-primary);
            padding: 12px 24px;
            text-align: center;
            font-size: 14px;
            font-weight: 500;
            border-radius: 24px;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            width: 100%;
            margin-bottom: 12px;
            position: relative;
            overflow: hidden;
            letter-spacing: 0.5px;
        }
        
        button::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(255, 255, 255, 0.1);
            transform: scale(0);
            border-radius: 50%;
            transition: transform 0.3s ease;
        }
        
        button:hover::before {
            transform: scale(4);
        }
        
        button:hover { 
            background: var(--primary-hover); 
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(103, 80, 164, 0.3);
        }
        
        button:active { 
            background: var(--primary-pressed); 
            transform: translateY(0);
        }
        
        button:disabled { 
            background: var(--disabled-bg); 
            color: var(--disabled-text); 
            cursor: not-allowed; 
            transform: none;
            box-shadow: none;
        }
        
        button.danger { 
            background: var(--md-error); 
            color: var(--md-on-error);
        }
        
        button.danger:hover { 
            background: #d32f2f; 
            box-shadow: 0 4px 12px rgba(186, 26, 26, 0.3);
        }
        input[type="text"],
        input[type="number"],
        select,
        textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--md-outline);
            border-radius: 12px;
            font-size: 14px;
            margin-bottom: 12px;
            background: var(--md-surface-container-low);
            color: var(--md-on-surface);
            transition: all 0.2s ease;
            outline: none;
        }
        
        input[type="text"]:focus,
        input[type="number"]:focus,
        select:focus,
        textarea:focus {
            border-color: var(--md-primary);
            background: var(--md-surface-container);
            box-shadow: 0 0 0 2px rgba(103, 80, 164, 0.2);
        }
        
        input[type="text"]:hover,
        input[type="number"]:hover,
        select:hover,
        textarea:hover {
            border-color: var(--md-on-surface-variant);
        }
        textarea { 
            font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Courier New', monospace; 
            resize: vertical; 
            min-height: 150px; 
        }
        
        .steps-editor { 
            position: relative; 
            border: 1px solid var(--md-outline); 
            border-radius: 12px; 
            background: var(--md-surface-container-low); 
            margin-bottom: 12px; 
            display: flex; 
            width: 100%; 
            overflow: hidden;
            transition: all 0.2s ease;
        }
        
        .steps-editor:focus-within {
            border-color: var(--md-primary);
            box-shadow: 0 0 0 2px rgba(103, 80, 164, 0.2);
        }
        .line-numbers {
            width: 50px;
            background: var(--md-surface-variant);
            border-right: 1px solid var(--md-outline-variant);
            color: var(--md-on-surface-variant);
            font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Courier New', monospace;
            font-size: 12px;
            line-height: 20px;
            padding: 12px 8px 12px 0;
            text-align: right;
            overflow-y: auto;
            overflow-x: hidden;
            user-select: none;
            white-space: pre;
            flex-shrink: 0;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .line-numbers::-webkit-scrollbar { display: none; }
        #stepsInput {
            flex: 1;
            padding: 12px;
            border: none;
            min-height: 300px;
            line-height: 20px;
            font-size: 12px;
            font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Courier New', monospace;
            resize: vertical;
            overflow-y: auto;
            overflow-x: auto;
            white-space: pre;
            background: transparent;
            color: var(--md-on-surface);
            outline: none;
        }
        .row { 
            display: grid; 
            grid-template-columns: 1fr 1fr; 
            gap: 12px; 
            margin-bottom: 12px; 
        }
        
        .input-group { 
            display: flex; 
            align-items: center; 
            gap: 12px; 
            margin-bottom: 12px; 
        }
        
        .input-group label { 
            min-width: 60px; 
            font-weight: 500;
            color: var(--md-on-surface);
        }
        #logText {
            background: var(--md-surface-container-low);
            min-height: 200px;
            max-height: 200px;
            overflow-y: auto;
            padding: 16px;
            font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Courier New', monospace;
            font-size: 12px;
            border-radius: 12px;
            border: 1px solid var(--md-outline-variant);
            color: var(--md-on-surface);
        }
        
        #sequenceDetails {
            background: var(--md-surface-container-low);
            min-height: 120px;
            max-height: 120px;
            overflow-y: auto;
            border-radius: 12px;
            border: 1px solid var(--md-outline-variant);
            color: var(--md-on-surface);
        }
        
        #sequenceList {
            list-style: none;
            padding: 0;
            max-height: 200px;
            overflow-y: auto;
            border: 1px solid var(--md-outline-variant);
            border-radius: 12px;
            background: var(--md-surface-container-low);
        }
        #sequenceList li {
            padding: 12px 16px;
            cursor: pointer;
            border-bottom: 1px solid var(--md-outline-variant);
            transition: all 0.2s ease;
            color: var(--md-on-surface);
        }
        
        #sequenceList li:last-child {
            border-bottom: none;
        }
        
        #sequenceList li:hover {
            background: var(--md-surface-container);
        }
        
        #sequenceList li.selected {
            background: var(--md-primary-container);
            color: var(--md-on-primary-container);
            font-weight: 600;
        }
        .status-indicator { 
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-left: 12px; 
            font-weight: 600; 
            padding: 4px 8px;
            border-radius: 12px;
            font-size: 12px;
        }
        
        .status-connected { 
            color: var(--md-on-tertiary-container);
            background: var(--md-tertiary-container);
        }
        
        .status-disconnected { 
            color: var(--md-on-error-container);
            background: var(--md-error-container);
        }
        
        .active-sequence-display {
            text-align: center;
            font-size: 18px;
            font-weight: 600;
            color: var(--md-on-primary-container);
            padding: 20px;
            background: var(--md-primary-container);
            border-radius: 16px;
            margin-bottom: 16px;
            border: 1px solid var(--md-outline-variant);
        }
        .step-info { 
            text-align: right; 
            color: var(--md-on-surface-variant); 
            font-size: 12px; 
            margin-top: 8px; 
        }
        
        .button-group { 
            display: grid; 
            grid-template-columns: repeat(2, 1fr); 
            gap: 12px; 
        }
        
        .right-panel { 
            min-width: 650px; 
        }
        
        @media (max-width: 1024px) {
            .main-layout {
                grid-template-columns: 350px 1fr;
            }
        }
        
        @media (max-width: 768px) {
            .main-layout {
                grid-template-columns: 1fr;
            }
            .button-group {
                grid-template-columns: 1fr;
            }
            .right-panel {
                min-width: auto;
            }
            .steps-editor {
                min-width: auto;
                overflow-x: auto;
            }
            .container {
                padding: 16px;
            }
            .debug-input-container {
                flex-direction: column;
            }
            .debug-input-container button {
                width: 100%;
            }
        }
        .current-line-highlight { 
            background: var(--md-primary-container); 
            color: var(--md-on-primary-container);
        }
        
        .debug-output {
            background: var(--md-surface-container-lowest);
            color: var(--md-on-surface);
            font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Courier New', monospace;
            font-size: 12px;
            min-height: 500px;
            max-height: 500px;
            overflow-y: auto;
            padding: 16px;
            border: 1px solid var(--md-outline-variant);
            border-radius: 12px;
            margin-bottom: 16px;
            white-space: pre-wrap;
            word-break: break-all;
        }
        
        .debug-input-container {
            display: flex;
            gap: 12px;
            margin-bottom: 12px;
            width: 100%;
            box-sizing: border-box;
        }
        
        .debug-input-container input {
            flex: 1;
            font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Courier New', monospace;
            font-size: 12px;
            margin-bottom: 0;
            min-width: 0;
        }
        
        .debug-input-container button {
            flex-shrink: 0;
            width: auto;
            padding: 8px 16px;
            font-size: 12px;
        }
        
        .debug-buttons {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }
        
        .debug-buttons button {
            font-size: 12px;
            padding: 8px 16px;
        }
        
        .debug-sent { 
            color: var(--md-primary); 
        }
        
        .debug-received { 
            color: var(--md-tertiary); 
        }
        .debug-error { 
            color: var(--md-error); 
        }
        
        .debug-info { 
            color: var(--md-on-surface-variant); 
        }
        
        .sequence-name-valid { 
            border-color: var(--md-tertiary) !important; 
            background-color: var(--md-tertiary-container) !important; 
        }
        
        .sequence-name-invalid { 
            border-color: var(--md-error) !important; 
            background-color: var(--md-error-container) !important; 
        }
        
        /* Custom scrollbar styles */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        
        ::-webkit-scrollbar-track {
            background: var(--md-surface-variant);
            border-radius: 4px;
        }
        
        ::-webkit-scrollbar-thumb {
            background: var(--md-outline);
            border-radius: 4px;
        }
        
        ::-webkit-scrollbar-thumb:hover {
            background: var(--md-on-surface-variant);
        }
        .validation-message {
            font-size: 12px;
            margin-top: 5px;
            padding: 5px;
            border-radius: 3px;
        }
        .validation-success { color: #4CAF50; background-color: #f0fff0; border: 1px solid #4CAF50; }
        .validation-error { color: #f44336; background-color: #fff0f0; border: 1px solid #f44336; }
        #fkeyTable table { width: 100%; border-collapse: collapse; margin-top: 10px; }
        #fkeyTable th, #fkeyTable td { border: 1px solid #ddd; padding: 8px; text-align: center; }
        #fkeyTable th { background-color: #f5f5f5; font-weight: bold; }
        #fkeyTable select {
            width: 100%;
            padding: 4px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 12px;
        }
        #fkeyTable button {
            padding: 4px 8px;
            margin: 2px;
            font-size: 11px;
            border-radius: 3px;
            min-width: 40px;
        }
        .fkey-bind-btn { background-color: #2196F3; }
        .fkey-bind-btn:hover { background-color: #1976D2; }
        .fkey-unbind-btn {
            background-color: #ff9800;
        }
        .fkey-unbind-btn:hover {
            background-color: #f57c00;
        }
        #numkeyTable table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 10px;
        }
        #numkeyTable th, #numkeyTable td {
            border: 1px solid #ddd;
            padding: 8px;
            text-align: center;
        }
        #numkeyTable th {
            background-color: #f5f5f5;
            font-weight: bold;
        }
        #numkeyTable select {
            width: 100%;
            padding: 4px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 12px;
        }
        #numkeyTable button {
            padding: 4px 8px;
            margin: 2px;
            font-size: 11px;
            border-radius: 3px;
            min-width: 40px;
        }
        .numkey-set-btn {
            background-color: #4CAF50;
        }
        .numkey-set-btn:hover {
            background-color: #45a049;
        }
        .numkey-clear-btn {
            background-color: #ff9800;
        }
        .numkey-clear-btn:hover {
            background-color: #f57c00;
        }
        #sidekeyTable table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 10px;
        }
        #sidekeyTable th, #sidekeyTable td {
            border: 1px solid #ddd;
            padding: 8px;
            text-align: center;
        }
        #sidekeyTable th {
            background-color: #f5f5f5;
            font-weight: bold;
        }
        #sidekeyTable select {
            width: 100%;
            padding: 4px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 12px;
        }
        #sidekeyTable button {
            padding: 4px 8px;
            margin: 2px;
            font-size: 11px;
            border-radius: 3px;
            min-width: 40px;
        }
        .sidekey-bind-btn {
            background-color: #4CAF50;
        }
        .sidekey-bind-btn:hover {
            background-color: #45a049;
        }
        .sidekey-unbind-btn {
            background-color: #ff9800;
        }
        .sidekey-unbind-btn:hover {
            background-color: #f57c00;
        }
        .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: 15% auto;
            padding: 20px;
            border-radius: 10px;
            width: 80%;
            max-width: 500px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        }
        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }
        .modal-header h2 {
            margin: 0;
        }
        .close {
            color: #aaa;
            font-size: 28px;
            font-weight: bold;
            cursor: pointer;
        }
        .close:hover {
            color: #000;
        }