:root {
            --bg-color: #0f1115;
            --panel-bg: rgba(22, 26, 34, 0.85);
            --accent-color: #3b82f6;
            --accent-hover: #2563eb;
            --text-main: #f3f4f6;
            --text-muted: #9ca3af;
            --border-color: rgba(255, 255, 255, 0.08);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            user-select: none;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            overflow: hidden;
            width: 100vw;
            height: 100vh;
            display: flex;
        }

        #canvas-container {
            flex-grow: 1;
            height: 100%;
            position: relative;
            cursor: grab;
        }

        #canvas-container:active {
            cursor: grabbing;
        }

        canvas {
            display: block;
            width: 100%;
            height: 100%;
        }

        /* Control Panel Styles */
        #control-panel {
            position: absolute;
            top: 20px;
            left: 20px;
            width: 320px;
            background: var(--panel-bg);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 24px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
            z-index: 10;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .panel-header h1 {
            font-size: 1.1rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            color: #ffffff;
            margin-bottom: 4px;
        }

        .panel-header p {
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        .divider {
            height: 1px;
            background: var(--border-color);
            width: 100%;
        }

        .button-group {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
        }

        button {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-color);
            border-radius: 6px;
            color: var(--text-main);
            padding: 10px 14px;
            font-size: 0.85rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        button:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.2);
        }

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

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

        button.active {
            background: rgba(59, 130, 246, 0.2);
            border-color: var(--accent-color);
            color: #60a5fa;
        }

        .control-element {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .label-container {
            display: flex;
            justify-content: space-between;
            font-size: 0.8rem;
            font-weight: 500;
        }

        .label-val {
            color: var(--accent-color);
        }

        input[type="range"] {
            -webkit-appearance: none;
            width: 100%;
            height: 6px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 3px;
            outline: none;
        }

        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--accent-color);
            cursor: pointer;
            transition: transform 0.1s ease;
        }

        input[type="range"]::-webkit-slider-thumb:hover {
            transform: scale(1.2);
        }

        /* Diagnostic Overlay */
        #diagnostics {
            position: absolute;
            bottom: 20px;
            left: 20px;
            font-family: monospace;
            font-size: 0.75rem;
            color: var(--text-muted);
            pointer-events: none;
            line-height: 1.5;
            background: rgba(0,0,0,0.4);
            padding: 8px;
            border-radius: 4px;
        }