:root {
            --glass-bg: rgba(255, 255, 255, 0.03);
            --glass-border: rgba(255, 255, 255, 0.08);
            --glass-highlight: rgba(255, 255, 255, 0.2);
            --neon-accent: #667eea;
            --text-main: rgba(255, 255, 255, 0.9);
            --text-muted: rgba(255, 255, 255, 0.6);
        }

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

        body {
            overflow: hidden;
            background: #050508;
            font-family: 'Outfit', sans-serif;
            color: var(--text-main);
        }

        canvas {
            display: block;
            width: 100%;
            height: 100%;
            cursor: crosshair;
            position: absolute;
            top: 0;
            left: 0;
            z-index: 1;
        }

        .glass-panel {
            backdrop-filter: blur(24px) saturate(120%);
            -webkit-backdrop-filter: blur(24px) saturate(120%);
            background: linear-gradient(145deg,
                    rgba(255, 255, 255, 0.05) 0%,
                    rgba(255, 255, 255, 0.01) 100%);
            border: 1px solid var(--glass-border);
            border-top: 1px solid var(--glass-highlight);
            border-left: 1px solid var(--glass-highlight);
            box-shadow:
                0 20px 40px rgba(0, 0, 0, 0.4),
                inset 0 0 20px rgba(255, 255, 255, 0.02);
            border-radius: 24px;
            color: var(--text-main);
            transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
            position: absolute;
            z-index: 10;
            overflow: hidden;
        }

        .glass-panel::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg,
                    transparent,
                    rgba(255, 255, 255, 0.05),
                    transparent);
            transform: skewX(-15deg);
            transition: 0.5s;
            pointer-events: none;
        }

        .glass-panel:hover {
            background: linear-gradient(145deg,
                    rgba(255, 255, 255, 0.08) 0%,
                    rgba(255, 255, 255, 0.02) 100%);
            box-shadow:
                0 30px 60px rgba(0, 0, 0, 0.5),
                inset 0 0 20px rgba(255, 255, 255, 0.05);
            transform: translateY(-2px);
            border-color: rgba(255, 255, 255, 0.15);
        }

        .glass-panel:hover::before {
            left: 150%;
            transition: 0.7s ease-in-out;
        }

        #instructions-container {
            top: 32px;
            left: 32px;
            width: 280px;
            padding: 24px;
        }

        #instruction-title {
            font-weight: 500;
            font-size: 18px;
            margin-bottom: 8px;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, #fff 30%, #a5b4fc 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        }

        .instruction-text {
            font-size: 14px;
            line-height: 1.5;
            color: var(--text-muted);
            font-weight: 300;
        }

        #theme-selector {
            top: 32px;
            right: 32px;
            padding: 24px;
            display: flex;
            flex-direction: column;
            gap: 16px;
            width: 220px;
        }

        #theme-selector-title {
            font-size: 12px;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--text-muted);
            font-weight: 600;
            margin-bottom: 4px;
        }

        .theme-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 12px;
            justify-items: center;
        }

        .theme-button {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            border: none;
            cursor: pointer;
            position: relative;
            transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
            box-shadow:
                0 4px 10px rgba(0, 0, 0, 0.3),
                inset 0 2px 4px rgba(255, 255, 255, 0.4),
                inset 0 -2px 4px rgba(0, 0, 0, 0.2);
        }

        #theme-1 {
            background: radial-gradient(circle at 30% 30%, #a78bfa, #4c1d95);
        }

        #theme-2 {
            background: radial-gradient(circle at 30% 30%, #fb7185, #9f1239);
        }

        #theme-3 {
            background: radial-gradient(circle at 30% 30%, #38bdf8, #0c4a6e);
        }

        .theme-button::after {
            content: '';
            position: absolute;
            top: -4px;
            left: -4px;
            right: -4px;
            bottom: -4px;
            border-radius: 50%;
            border: 2px solid rgba(255, 255, 255, 0.8);
            opacity: 0;
            transform: scale(1.1);
            transition: all 0.3s ease;
        }

        .theme-button:hover {
            transform: scale(1.15) translateY(-2px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4), inset 0 2px 6px rgba(255, 255, 255, 0.6);
        }

        .theme-button.active::after {
            opacity: 1;
            transform: scale(1);
            border-color: rgba(255, 255, 255, 0.9);
            box-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
        }

        #density-controls {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: 8px;
        }

        .density-label {
            display: flex;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-muted);
            font-weight: 300;
        }

        #density-value {
            color: white;
            font-weight: 500;
            text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
        }

        .density-slider {
            -webkit-appearance: none;
            width: 100%;
            height: 6px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 10px;
            outline: none;
            box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.3);
        }

        .density-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: #fff;
            cursor: pointer;
            box-shadow:
                0 0 15px rgba(255, 255, 255, 0.8),
                0 2px 5px rgba(0, 0, 0, 0.3);
            transition: all 0.2s ease;
            margin-top: -6px;
            position: relative;
            z-index: 2;
        }

        .density-slider::-webkit-slider-runnable-track {
            width: 100%;
            height: 6px;
            cursor: pointer;
            background: linear-gradient(90deg, rgba(255, 255, 255, 0.3) var(--val, 100%), rgba(255, 255, 255, 0.05) var(--val, 100%));
            border-radius: 3px;
        }

        .density-slider::-webkit-slider-thumb:hover {
            transform: scale(1.2);
            box-shadow: 0 0 20px rgba(255, 255, 255, 1);
        }

        #control-buttons {
            position: absolute;
            bottom: 40px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            gap: 16px;
            z-index: 20;
            padding: 8px;
            background: rgba(0, 0, 0, 0.1);
        }

        .control-button {
            backdrop-filter: blur(20px) saturate(140%);
            -webkit-backdrop-filter: blur(20px) saturate(140%);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-top: 1px solid rgba(255, 255, 255, 0.25);
            color: var(--text-main);
            padding: 12px 24px;
            border-radius: 50px;
            cursor: pointer;
            font-family: 'Outfit', sans-serif;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            transition: all 0.3s ease;
            box-shadow:
                0 8px 20px rgba(0, 0, 0, 0.3),
                inset 0 0 10px rgba(255, 255, 255, 0.02);
            overflow: hidden;
            position: relative;
            min-width: 100px;
            text-align: center;
        }

        .control-button:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.4);
            transform: translateY(-4px);
            box-shadow:
                0 15px 30px rgba(0, 0, 0, 0.4),
                0 0 20px rgba(255, 255, 255, 0.1);
            text-shadow: 0 0 8px rgba(255, 255, 255, 0.6);
        }

        .control-button:active {
            transform: translateY(-1px);
        }

        .control-button span {
            position: relative;
            z-index: 2;
        }

        @media (max-width: 640px) {
            #instructions-container {
                top: 16px;
                left: 16px;
                right: 16px;
                width: auto;
                padding: 16px;
                background: rgba(10, 10, 15, 0.6);
            }

            #theme-selector {
                top: auto;
                bottom: 100px;
                left: 16px;
                right: 16px;
                width: auto;
                padding: 16px;
                flex-direction: row;
                align-items: center;
                justify-content: space-between;
            }

            .theme-grid {
                margin-top: 0;
            }

            #control-buttons {
                bottom: 24px;
                width: 100%;
                justify-content: center;
                gap: 8px;
                padding: 0 16px;
            }

            .control-button {
                padding: 10px 16px;
                min-width: auto;
                font-size: 11px;
                flex: 1;
            }
        }