    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
            min-height: 100vh;
            padding: 20px;
            color: #eee;
        }
        .container { max-width: 1400px; margin: 0 auto; }
        h1 { text-align: center; margin-bottom: 30px; color: #6bff6b; font-size: 28px; }
        .panel {
            background: rgba(0, 0, 0, 0.6);
            border-radius: 12px;
            padding: 24px;
            margin-bottom: 20px;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255,255,255,0.1);
        }
        .panel h2 {
            margin-bottom: 20px;
            font-size: 18px;
            color: #aaa;
            border-bottom: 1px solid #333;
            padding-bottom: 10px;
        }
        .status-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
            margin-bottom: 20px;
        }
        .status-card {
            background: #0a0a0a;
            padding: 20px;
            border-radius: 10px;
            border-left: 4px solid #ffaa00;
        }
        .status-card.ws-connected { border-left-color: #6bff6b; }
        .status-card.ws-disconnected { border-left-color: #ff6b6b; }
        .status-card.serial-connected { border-left-color: #6bff6b; }
        .status-card.serial-disconnected { border-left-color: #ff6b6b; }
        .status-label {
            font-size: 12px;
            color: #888;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
        }
        .status-value { font-size: 20px; font-weight: bold; }
        .button-group {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }
        button {
            background: #2d2d2d;
            color: #fff;
            border: none;
            padding: 12px 24px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.2s;
        }
        button:hover:not(:disabled) {
            background: #4a4a4a;
            transform: translateY(-1px);
        }
        button:disabled { opacity: 0.5; cursor: not-allowed; }
        button.primary { background: #6bff6b; color: #1a1a2e; }
        button.danger { background: #ff6b6b; color: #1a1a2e; }
        button.warning { background: #ffaa00; color: #1a1a2e; }
        .log-container {
            background: #0a0a0a;
            border-radius: 8px;
            padding: 15px;
            height: 400px;
            overflow-y: auto;
            font-family: 'Courier New', monospace;
            font-size: 12px;
            border: 1px solid #2d2d2d;
        }
        .log-entry {
            padding: 4px 8px;
            border-bottom: 1px solid #1a1a1a;
            font-family: monospace;
            white-space: pre-wrap;
            word-break: break-all;
        }
        .log-info { color: #6bff6b; }
        .log-error { color: #ff6b6b; }
        .log-send { color: #6b9eff; }
        .log-recv { color: #ffb86b; }
        .log-system { color: #ff6bff; }
        .input-row {
            display: flex;
            gap: 10px;
            margin-top: 15px;
        }
        input {
            flex: 1;
            padding: 12px 16px;
            background: #1e1e1e;
            border: 1px solid #3d3d3d;
            color: #fff;
            border-radius: 8px;
            font-family: monospace;
            font-size: 13px;
        }
        input:focus { outline: none; border-color: #6bff6b; }
        .url-input {
            background: #0a0a0a;
            font-family: monospace;
            margin-bottom: 15px;
        }
        .diagnostic {
            background: #1e1e1e;
            padding: 10px;
            border-radius: 8px;
            margin-top: 15px;
            font-size: 11px;
            font-family: monospace;
        }
        @media (max-width: 768px) {
            .button-group button { flex: 1; min-width: 120px; }
            .status-grid { grid-template-columns: 1fr; }
        }
    </style>
