body, html {
            margin: 0;
            padding: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            background-color: #000;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
        }

        #hydra-canvas {
            width: 100%;
            height: 100%;
            display: block;
        }

        .ui-wrapper {
            position: absolute;
            bottom: 16px;
            right: 16px;
            z-index: 10;
            display: flex;
            align-items: flex-end;
            gap: 16px;
            transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        }

        /* Slides out panel width + gap (258px + 16px) to preserve right spacing for the toggle */
        .ui-wrapper.hidden {
            transform: translateX(274px); 
        }

        .toggle-btn {
            background: rgba(10, 10, 10, 0.4);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.05);
            cursor: pointer;
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            box-shadow: 0 4px 12px rgba(0,0,0,0.3);
            opacity: 0.7;
            transition: opacity 0.2s ease, background 0.2s ease;
            padding: 0;
            flex-shrink: 0;
        }

        .toggle-btn:hover {
            opacity: 1;
            background: rgba(10, 10, 10, 0.6);
        }

        .toggle-btn svg {
            width: 14px;
            height: 14px;
            fill: none;
            stroke: #ffffff;
            stroke-width: 3;
            stroke-linecap: round;
            stroke-linejoin: round;
            transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
            transform: rotate(0deg);
        }

        .ui-wrapper.hidden .toggle-btn svg {
            transform: rotate(180deg);
        }

        .controls-container {
            width: 210px;
            display: flex;
            flex-direction: column;
            gap: 24px;
            background: rgba(10, 10, 10, 0.4); 
            backdrop-filter: blur(20px);        
            -webkit-backdrop-filter: blur(20px); 
            padding: 24px;
            border-radius: 12px;
            border: 1px solid rgba(255, 255, 255, 0.05); 
            box-shadow: 0 10px 30px rgba(0,0,0,0.3);
        }

        .slider-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
            transition: transform 0.2s ease, opacity 0.2s ease;
            opacity: 0.5; 
        }

        .slider-group:hover,
        .slider-group:focus-within {
            opacity: 1; 
            transform: translateX(-2px); 
        }

        .slider-header {
            display: flex;
            justify-content: space-between;
            align-items: baseline;
            color: #fff;
            font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
            font-size: 9px;
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.18em;
        }

        .slider-header label {
            opacity: 0.9;
        }

        .slider-header span.val {
            opacity: 0.5;
            font-size: 9px;
            letter-spacing: 0.05em;
        }

        .slider-wrapper {
            position: relative;
            display: flex;
            align-items: center;
            width: 100%;
            height: 20px;
        }

        /* Thicker tracks for easier clicking */
        input[type="range"] {
            -webkit-appearance: none;
            appearance: none;
            width: 100%;
            background: rgba(255, 255, 255, 0.2);
            height: 3px;
            outline: none;
            margin: 0;
            transition: background 0.2s ease;
        }

        .slider-group:hover input[type="range"] {
            background: rgba(255, 255, 255, 0.4); 
        }

        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 8px;
            height: 8px;
            background: #fff;
            border-radius: 50%;
            cursor: pointer;
            box-shadow: 0 0 0 0px rgba(255, 255, 255, 0);
            transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
        }

        .slider-wrapper:hover input[type="range"]::-webkit-slider-thumb {
            transform: scale(1.25);
            box-shadow: 0 0 0 6px rgba(255, 255, 255, 0.15);
        }

        input[type="range"]:active::-webkit-slider-thumb {
            background: #000;
            box-shadow: 0 0 0 5px #fff !important;
        }

        input[type="range"]::-moz-range-thumb {
            width: 8px;
            height: 8px;
            background: #fff;
            border-radius: 50%;
            border: none;
            cursor: pointer;
            transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
        }

        .slider-wrapper:hover input[type="range"]::-moz-range-thumb {
            transform: scale(1.25);
            box-shadow: 0 0 0 6px rgba(255, 255, 255, 0.15);
        }

        input[type="range"]:active::-moz-range-thumb {
            background: #000;
            box-shadow: 0 0 0 5px #fff !important;
        }