:root {
            --bg-color: #010103;
            --cyan: #00e5ff;
            --cyan-glow: rgba(0, 229, 255, 0.4);
            --pink: #ff007f;
            --pink-glow: rgba(255, 0, 127, 0.4);
            --gold: #ffb703;
            --gold-glow: rgba(255, 183, 3, 0.4);
            --purple: #9d4edd;
            --green: #4ade80;
            --glass-bg: rgba(8, 12, 24, 0.72);
            --glass-border: rgba(255, 255, 255, 0.12);
            --font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
        }

        * {
            box-sizing: border-box;
            user-select: none;
            -webkit-user-select: none;
        }

        body {
            margin: 0;
            padding: 0;
            overflow: hidden;
            background-color: var(--bg-color);
            font-family: var(--font-family);
            color: #fff;
            width: 100vw;
            height: 100vh;
        }

        #canvas-container {
            width: 100vw;
            height: 100vh;
            position: absolute;
            top: 0;
            left: 0;
            z-index: 1;
        }

        /* Full UI Overlay */
        #ui-layer {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 10;
            pointer-events: none;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            padding: 22px;
        }

        header {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            pointer-events: auto;
        }

        .brand-box {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        h1 {
            margin: 0;
            font-size: 1.75rem;
            letter-spacing: 2.5px;
            text-transform: uppercase;
            font-weight: 900;
            background: linear-gradient(135deg, #ffffff 10%, #00e5ff 60%, #9d4edd 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 0 25px rgba(0, 229, 255, 0.45);
        }

        .subtitle {
            font-size: 0.78rem;
            letter-spacing: 2px;
            color: rgba(255, 255, 255, 0.55);
            text-transform: uppercase;
            font-weight: 600;
        }

        p.status {
            font-size: 0.92rem;
            color: var(--green);
            margin: 4px 0 0 0;
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            text-shadow: 0 0 10px rgba(74, 222, 128, 0.5);
        }

        .status-dot {
            width: 9px;
            height: 9px;
            border-radius: 50%;
            background-color: var(--green);
            box-shadow: 0 0 10px var(--green);
            animation: pulse-dot 1.5s infinite;
        }

        @keyframes pulse-dot {
            0% { transform: scale(0.9); opacity: 0.7; }
            50% { transform: scale(1.3); opacity: 1; }
            100% { transform: scale(0.9); opacity: 0.7; }
        }

        .loading .status-dot { background-color: #facc15; box-shadow: 0 0 10px #facc15; }
        .error .status-dot { background-color: #f87171; box-shadow: 0 0 10px #f87171; }
        .resetting .status-dot { background-color: var(--cyan); box-shadow: 0 0 12px var(--cyan); animation: pulse-dot 0.5s infinite; }

        /* Top-Right HUD Card */
        #hud-card {
            pointer-events: auto;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: 18px;
            padding: 15px 18px;
            backdrop-filter: blur(14px);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
            display: flex;
            flex-direction: column;
            gap: 9px;
            min-width: 290px;
        }

        .hud-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            padding-bottom: 7px;
            font-size: 0.72rem;
            letter-spacing: 1.5px;
            color: rgba(255, 255, 255, 0.65);
            font-weight: 700;
        }

        .hud-fps {
            color: var(--cyan);
            font-weight: 800;
            font-family: monospace;
            font-size: 0.88rem;
        }

        .hands-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 8px;
        }

        .hand-col {
            background: rgba(255, 255, 255, 0.04);
            border-radius: 12px;
            padding: 9px;
            border: 1px solid rgba(255, 255, 255, 0.06);
            display: flex;
            flex-direction: column;
            gap: 3px;
        }

        .hand-label {
            font-size: 0.68rem;
            font-weight: 800;
            letter-spacing: 1px;
            text-transform: uppercase;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .hand-label.left { color: var(--cyan); }
        .hand-label.right { color: var(--pink); }

        .hand-gesture {
            font-size: 0.82rem;
            font-weight: 700;
            color: #fff;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .hand-sub {
            font-size: 0.68rem;
            color: rgba(255, 255, 255, 0.5);
        }

        .mode-row {
            background: linear-gradient(90deg, rgba(0, 229, 255, 0.1), rgba(157, 78, 221, 0.1));
            border-radius: 10px;
            padding: 7px 11px;
            border: 1px solid rgba(0, 229, 255, 0.2);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .mode-title {
            font-size: 0.68rem;
            letter-spacing: 1px;
            color: rgba(255, 255, 255, 0.65);
            font-weight: 700;
            text-transform: uppercase;
        }

        .mode-value {
            font-size: 0.78rem;
            font-weight: 800;
            color: var(--cyan);
            letter-spacing: 0.5px;
            text-shadow: 0 0 10px var(--cyan-glow);
        }

        /* Energy Bar */
        .energy-bar-wrap {
            width: 100%;
            height: 6px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 3px;
            overflow: hidden;
            margin-top: 2px;
        }

        .energy-bar-fill {
            height: 100%;
            width: 60%;
            background: linear-gradient(90deg, var(--cyan), var(--gold), var(--pink));
            border-radius: 3px;
            transition: width 0.15s ease-out;
            box-shadow: 0 0 8px var(--cyan);
        }

        /* Instructions Side Panel */
        #instructions-panel {
            position: absolute;
            top: 135px;
            left: 22px;
            pointer-events: auto;
            color: rgba(255, 255, 255, 0.85);
            font-size: 0.82rem;
            width: 285px;
            background: var(--glass-bg);
            padding: 16px 18px;
            border-radius: 18px;
            backdrop-filter: blur(14px);
            border: 1px solid var(--glass-border);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
            transition: transform 0.3s ease, opacity 0.3s ease;
        }

        #instructions-panel.collapsed {
            transform: translateX(-240px);
            opacity: 0.4;
        }

        #instructions-panel.collapsed:hover {
            opacity: 0.9;
        }

        .inst-toggle {
            cursor: pointer;
            float: right;
            font-size: 0.72rem;
            color: var(--cyan);
            font-weight: bold;
        }

        .inst-title {
            font-size: 0.72rem;
            letter-spacing: 1.5px;
            font-weight: 800;
            text-transform: uppercase;
            color: var(--cyan);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .inst-section {
            margin-bottom: 8px;
            padding-bottom: 7px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.07);
        }

        .inst-section:last-child {
            border-bottom: none;
            margin-bottom: 0;
            padding-bottom: 0;
        }

        .inst-header {
            font-size: 0.7rem;
            font-weight: 800;
            color: rgba(255, 255, 255, 0.9);
            margin-bottom: 3px;
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .inst-row {
            display: flex;
            justify-content: space-between;
            margin: 2px 0;
            font-size: 0.74rem;
        }

        .key-action {
            color: #fff;
            font-weight: 600;
        }

        .key-result {
            color: rgba(255, 255, 255, 0.6);
            text-align: right;
        }

        .tag-dual {
            background: linear-gradient(90deg, #ff007f, #00e5ff);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            font-weight: 800;
        }

        /* Shape & Utility Controls Bar */
        #controls-wrapper {
            pointer-events: auto;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 9px;
            width: 100%;
            margin-bottom: 8px;
        }

        #controls {
            display: flex;
            flex-wrap: wrap;
            gap: 7px;
            justify-content: center;
            background: var(--glass-bg);
            padding: 10px 18px;
            border-radius: 40px;
            backdrop-filter: blur(14px);
            border: 1px solid var(--glass-border);
            box-shadow: 0 10px 35px rgba(0, 0, 0, 0.6);
            max-width: 95vw;
        }

        button.shape-btn {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #e0e0e0;
            padding: 7px 15px;
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.22s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            font-size: 0.76rem;
            text-transform: uppercase;
            font-weight: 700;
            letter-spacing: 0.8px;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        button.shape-btn:hover {
            background: rgba(0, 229, 255, 0.2);
            border-color: var(--cyan);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px var(--cyan-glow);
        }

        button.shape-btn.active {
            background: linear-gradient(135deg, #00e5ff, #3a7bd5);
            border-color: transparent;
            color: #fff;
            box-shadow: 0 0 18px var(--cyan-glow);
            transform: scale(1.05);
        }

        .util-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            justify-content: center;
            align-items: center;
        }

        button.util-btn {
            background: rgba(255, 255, 255, 0.07);
            border: 1px solid rgba(255, 255, 255, 0.22);
            color: rgba(255, 255, 255, 0.85);
            padding: 6px 13px;
            border-radius: 16px;
            font-size: 0.72rem;
            cursor: pointer;
            font-weight: 700;
            letter-spacing: 0.7px;
            transition: all 0.2s;
            text-transform: uppercase;
        }

        button.util-btn:hover {
            background: rgba(255, 255, 255, 0.2);
            color: #fff;
        }

        button.util-btn.active {
            background: var(--gold);
            color: #000;
            border-color: var(--gold);
            box-shadow: 0 0 14px var(--gold-glow);
        }

        button.util-btn.stability-active {
            background: rgba(74, 222, 128, 0.2);
            border-color: var(--green);
            color: var(--green);
            box-shadow: 0 0 12px rgba(74, 222, 128, 0.35);
        }

        /* Sensitivity Segmented Switch */
        .sens-switch-group {
            display: flex;
            align-items: center;
            gap: 3px;
            background: rgba(0, 0, 0, 0.4);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 18px;
            padding: 2px 4px;
        }

        .sens-label {
            font-size: 0.65rem;
            font-weight: 800;
            color: rgba(255, 255, 255, 0.5);
            padding: 0 6px;
            letter-spacing: 0.5px;
        }

        .sens-btn {
            background: transparent;
            border: none;
            color: rgba(255, 255, 255, 0.7);
            padding: 4px 10px;
            border-radius: 14px;
            font-size: 0.68rem;
            font-weight: 800;
            cursor: pointer;
            transition: all 0.2s;
        }

        .sens-btn:hover {
            color: #fff;
        }

        .sens-btn.active {
            background: var(--cyan);
            color: #000;
            box-shadow: 0 0 10px var(--cyan-glow);
        }

        /* Mirrored Webcam Preview */
        #webcam-container {
            position: absolute;
            bottom: 22px;
            right: 22px;
            pointer-events: auto;
            display: flex;
            flex-direction: column;
            align-items: flex-end;
            gap: 5px;
            z-index: 20;
        }

        #webcam-preview {
            width: 210px;
            height: 158px;
            background: #000;
            border-radius: 16px;
            border: 2px solid rgba(0, 229, 255, 0.45);
            transform: scaleX(-1); /* Mirror view */
            object-fit: cover;
            box-shadow: 0 0 25px rgba(0, 0, 0, 0.9);
            transition: border-color 0.3s, transform 0.3s;
        }

        #webcam-preview:hover {
            border-color: var(--cyan);
            transform: scaleX(-1) scale(1.03);
        }

        .webcam-legend {
            display: flex;
            gap: 12px;
            font-size: 0.66rem;
            font-weight: 800;
            letter-spacing: 0.5px;
            background: rgba(0, 0, 0, 0.65);
            padding: 4px 10px;
            border-radius: 10px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .legend-item {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .legend-dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
        }

        .legend-dot.left { background-color: var(--cyan); }
        .legend-dot.right { background-color: var(--pink); }

        /* Real-Time Diagnostic Debug HUD */
        #debug-panel {
            position: absolute;
            bottom: 22px;
            left: 22px;
            pointer-events: auto;
            background: rgba(0, 0, 0, 0.88);
            border: 1px solid rgba(0, 229, 255, 0.35);
            border-radius: 14px;
            padding: 12px 16px;
            font-family: monospace;
            font-size: 0.70rem;
            color: #39ff14;
            display: none;
            max-width: 340px;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
            line-height: 1.45;
            z-index: 15;
        }

        #debug-panel.visible {
            display: block;
        }

        .debug-title {
            color: var(--cyan);
            font-weight: bold;
            border-bottom: 1px solid rgba(0, 229, 255, 0.3);
            padding-bottom: 4px;
            margin-bottom: 5px;
            display: flex;
            justify-content: space-between;
        }

        /* Mobile responsiveness */
        @media (max-width: 900px) {
            #instructions-panel {
                display: none;
            }

            #webcam-preview {
                width: 140px;
                height: 105px;
                bottom: 135px;
                right: 12px;
            }

            #hud-card {
                min-width: 220px;
                padding: 10px 14px;
            }

            h1 {
                font-size: 1.2rem;
                letter-spacing: 1px;
            }

            button.shape-btn {
                padding: 6px 12px;
                font-size: 0.7rem;
            }

            #controls {
                padding: 8px 12px;
                border-radius: 25px;
            }
        }