:root {
            --bg-color: #050510;
            --text-color: #ffffff;
            --glass-bg: rgba(20, 25, 40, 0.4);
            --glass-border: rgba(255, 255, 255, 0.15);
            --glass-blur: blur(16px);
            --accent: #00ffcc;
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            overflow: hidden;
        }

        .video-container {
            position: absolute;
            width: 100vw;
            height: 100vh;
        }

        .input_video {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transform: scaleX(-1); /* Mirror */
            z-index: 0; /* Let the raw camera sit behind */
            filter: brightness(0.6) contrast(1.1); /* Subtle dark to make neon pop */
        }

        /* 
         * Background Canvas captures the video frame and applies the matrix rain/starfield 
         */
        #bgCanvas, #mainCanvas {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transform: scaleX(-1); /* Mirror */
        }
        
        #bgCanvas {
            z-index: 1;
            pointer-events: none;
        }

        #mainCanvas {
            z-index: 5;
            pointer-events: none;
            /* We use mix-blend-mode for the glowing effects in canvas */
        }

        /* UI Overlays */
        #hud {
            position: absolute;
            top: 20px;
            left: 20px;
            z-index: 10;
            display: flex;
            flex-direction: column;
            gap: 15px;
            pointer-events: none;
        }

        .panel {
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border: 1px solid var(--glass-border);
            border-radius: 12px;
            padding: 15px 20px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
        }

        .stat {
            display: flex;
            justify-content: space-between;
            margin-bottom: 8px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.8);
            min-width: 180px;
        }
        .stat:last-child { margin-bottom: 0; }
        .stat span.val { font-weight: bold; color: var(--accent); }

        /* Themes */
        #themes {
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 10;
            display: flex;
            gap: 10px;
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            border: 1px solid var(--glass-border);
            border-radius: 30px;
            padding: 8px;
            transition: opacity 0.5s;
        }

        .theme-btn {
            background: transparent;
            border: 1px solid transparent;
            color: white;
            padding: 8px 16px;
            border-radius: 20px;
            cursor: pointer;
            transition: 0.3s ease;
            font-weight: 500;
        }
        
        .theme-btn.active {
            background: rgba(255,255,255,0.15);
            border-color: rgba(255,255,255,0.3);
            text-shadow: 0 0 10px white;
        }

        /* Start Overlay */
        #startOverlay {
            position: absolute;
            inset: 0;
            background: rgba(0,0,0,0.85);
            z-index: 100;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            backdrop-filter: blur(10px);
            transition: opacity 0.5s ease;
        }

        .start-btn {
            padding: 16px 40px;
            font-size: 1.2rem;
            background: linear-gradient(45deg, #ff00cc, #3333ff);
            border: none;
            color: white;
            border-radius: 30px;
            cursor: pointer;
            box-shadow: 0 0 20px rgba(255, 0, 204, 0.5);
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 2px;
            transition: transform 0.2s;
        }
        .start-btn:hover { transform: scale(1.05); }

        .hidden { opacity: 0; pointer-events: none; }