:root {
            --bg-color: #0b0c10;
            --neon-green: #39ff14;
            --neon-pink: #ff007f;
            --neon-cyan: #00ffff;
            --grid-color: rgba(255, 255, 255, 0.05);
        }

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

        body {
            background-color: var(--bg-color);
            color: #fff;
            font-family: 'Rajdhani', sans-serif;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            overflow: hidden;
            background-image: 
                linear-gradient(var(--grid-color) 1px, transparent 1px),
                linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
            background-size: 20px 20px;
        }

        #game-wrapper {
            position: relative;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 15px;
            z-index: 10;
        }

        header {
            display: flex;
            justify-content: space-between;
            width: 100%;
            max-width: 400px;
            padding: 10px 20px;
            background: rgba(0, 0, 0, 0.5);
            border: 1px solid var(--neon-cyan);
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 255, 255, 0.2);
            font-family: 'Press Start 2P', cursive;
            font-size: 10px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .score-box {
            color: var(--neon-cyan);
            text-shadow: 0 0 5px var(--neon-cyan);
        }

        .high-score-box {
            color: var(--neon-pink);
            text-shadow: 0 0 5px var(--neon-pink);
        }

         #canvas-container {
            position: relative;
            width: 400px;
            height: 400px;
            max-width: 90vw;
            max-height: 90vw;
            border: 2px solid var(--neon-cyan);
            border-radius: 4px;
            box-shadow: 0 0 15px var(--neon-cyan), inset 0 0 15px var(--neon-cyan);
            background-color: #050505;
            overflow: hidden;
        }

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

        .ui-screen {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(11, 12, 16, 0.85);
            backdrop-filter: blur(3px);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
            text-align: center;
        }

        .ui-screen.active {
            opacity: 1;
            pointer-events: all;
        }

        h1, h2 {
            font-family: 'Press Start 2P', cursive;
            margin-bottom: 20px;
            font-size: 24px;
        }

        h1 {
            color: var(--neon-green);
            text-shadow: 0 0 10px var(--neon-green), 0 0 20px var(--neon-green);
            line-height: 1.5;
        }

        h2 {
            color: var(--neon-pink);
            text-shadow: 0 0 10px var(--neon-pink);
            font-size: 20px;
        }

        .glitch {
            animation: glitch 1s linear infinite;
        }

        @keyframes glitch {
            2%, 64% { transform: translate(2px, 0) skew(0deg); }
            4%, 60% { transform: translate(-2px, 0) skew(0deg); }
            62% { transform: translate(0, 0) skew(5deg); }
        }

        .btn {
            background: transparent;
            color: var(--neon-cyan);
            font-family: 'Press Start 2P', cursive;
            font-size: 12px;
            padding: 15px 30px;
            border: 2px solid var(--neon-cyan);
            border-radius: 4px;
            cursor: pointer;
            box-shadow: 0 0 10px rgba(0, 255, 255, 0.3), inset 0 0 10px rgba(0, 255, 255, 0.3);
            text-transform: uppercase;
            transition: all 0.2s ease;
            margin-top: 10px;
        }

        .btn:hover, .btn:active {
            background: var(--neon-cyan);
            color: var(--bg-color);
            box-shadow: 0 0 20px var(--neon-cyan), inset 0 0 20px var(--neon-cyan);
        }

        .instructions {
            margin-top: 20px;
            font-size: 14px;
            color: #aaa;
            line-height: 1.6;
        }

        .key {
            display: inline-block;
            padding: 2px 6px;
            border: 1px solid #555;
            border-radius: 4px;
            background: #222;
            color: #fff;
            font-family: monospace;
        }

        /* controles mobile */
        #mobile-controls {
            display: none;
            grid-template-columns: repeat(3, 60px);
            grid-template-rows: repeat(2, 60px);
            gap: 10px;
            margin-top: 20px;
        }

        .d-btn {
            background: rgba(0, 255, 255, 0.1);
            border: 2px solid var(--neon-cyan);
            border-radius: 50%;
            color: var(--neon-cyan);
            font-size: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 10px rgba(0, 255, 255, 0.2);
            cursor: pointer;
            touch-action: manipulation;
        }

        .d-btn:active {
            background: var(--neon-cyan);
            color: var(--bg-color);
        }

        #btn-up { grid-column: 2; grid-row: 1; }
        #btn-left { grid-column: 1; grid-row: 2; }
        #btn-down { grid-column: 2; grid-row: 2; }
        #btn-right { grid-column: 3; grid-row: 2; }

        @media (max-width: 500px) {
            #mobile-controls {
                display: grid;
            }
        
            .instructions {
                display: none;
            }
        }