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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            color: #333;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        .header {
            text-align: center;
            color: white;
            margin-bottom: 30px;
        }

        .header h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
        }

        .header p {
            font-size: 1.1em;
            opacity: 0.9;
        }

        .main-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

        .panel {
            background: white;
            border-radius: 12px;
            padding: 20px;
            box-shadow: 0 8px 32px rgba(0,0,0,0.1);
            backdrop-filter: blur(10px);
        }

        .panel h2 {
            margin-bottom: 20px;
            color: #4a5568;
            border-bottom: 3px solid #667eea;
            padding-bottom: 10px;
        }

        .esp32-diagram {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 10px;
            max-height: 500px;
            overflow-y: auto;
        }

        .pin-button {
            background: linear-gradient(135deg, #f7fafc, #edf2f7);
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            padding: 12px;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
        }

        .pin-button:hover {
            background: linear-gradient(135deg, #e2e8f0, #cbd5e0);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }

        .pin-button.selected {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            border-color: #5a67d8;
        }

        .pin-name {
            font-weight: bold;
            margin-bottom: 5px;
        }

        .pin-type {
            font-size: 0.9em;
            color: #666;
        }

        .pin-button.selected .pin-type {
            color: #e2e8f0;
        }

        .pin-config {
            margin-top: 20px;
        }

        .config-section {
            background: #f7fafc;
            border-radius: 8px;
            padding: 15px;
            margin-bottom: 15px;
            border-left: 4px solid #667eea;
        }

        .config-section h4 {
            margin-bottom: 10px;
            color: #4a5568;
        }

        .input-group {
            margin-bottom: 10px;
        }

        .input-group label {
            display: block;
            margin-bottom: 5px;
            font-weight: 500;
            color: #4a5568;
        }

        .input-group input, .input-group select {
            width: 100%;
            padding: 8px 12px;
            border: 2px solid #e2e8f0;
            border-radius: 6px;
            font-size: 14px;
            transition: border-color 0.3s ease;
        }

        .input-group input:focus, .input-group select:focus {
            outline: none;
            border-color: #667eea;
        }

        .code-editor {
            background: #1a202c;
            color: #e2e8f0;
            border: none;
            border-radius: 8px;
            padding: 20px;
            font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
            font-size: 14px;
            line-height: 1.6;
            width: 100%;
            min-height: 400px;
            resize: vertical;
        }

        .code-editor:focus {
            outline: 2px solid #667eea;
        }

        .action-buttons {
            display: flex;
            gap: 10px;
            margin-top: 15px;
        }

        .btn {
            padding: 12px 24px;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .btn-primary {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
        }

        .btn-secondary {
            background: #edf2f7;
            color: #4a5568;
            border: 2px solid #e2e8f0;
        }

        .btn-secondary:hover {
            background: #e2e8f0;
            border-color: #cbd5e0;
        }

        .output-panel {
            grid-column: 1 / -1;
            margin-top: 20px;
        }

        .output {
            background: #1a202c;
            color: #e2e8f0;
            border-radius: 8px;
            padding: 20px;
            font-family: monospace;
            min-height: 200px;
            white-space: pre-wrap;
            overflow-y: auto;
        }

        .error {
            color: #fc8181;
        }

        .success {
            color: #68d391;
        }

        .warning {
            color: #f6e05e;
        }

        @media (max-width: 768px) {
            .main-grid {
                grid-template-columns: 1fr;
            }
            
            .esp32-diagram {
                grid-template-columns: 1fr;
            }
        }