body {
            margin: 0;
            overflow: hidden;
            font-family: 'Courier New', 'Creepster', monospace;
            touch-action: none;
        }
        #ui {
            position: absolute;
            top: 20px;
            left: 0;
            width: 100%;
            display: flex;
            justify-content: space-between;
            padding: 0 20px;
            box-sizing: border-box;
            pointer-events: none;
            z-index: 10;
            text-shadow: 2px 2px 0px black;
            font-weight: bold;
        }
        .panel {
            background: rgba(0,0,0,0.75);
            backdrop-filter: blur(4px);
            padding: 12px 24px;
            border-radius: 30px;
            border-left: 4px solid #ff3366;
            border-right: 4px solid #ff3366;
            color: #ffcc00;
            font-size: 1.6rem;
            letter-spacing: 2px;
            font-family: 'Courier New', monospace;
        }
        .panel span {
            color: white;
            font-weight: bold;
            font-size: 2rem;
            margin-left: 8px;
        }
        #healthBarContainer {
            position: absolute;
            bottom: 30px;
            left: 20px;
            right: 20px;
            width: auto;
            background: #330000;
            height: 20px;
            border-radius: 20px;
            border: 2px solid #aa2222;
            overflow: hidden;
            pointer-events: none;
            z-index: 10;
        }
        #healthFill {
            width: 100%;
            height: 100%;
            background: #e32222;
            background: linear-gradient(90deg, #ff4444, #aa0000);
            transition: width 0.2s ease;
        }
        .crosshair {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 24px;
            height: 24px;
            transform: translate(-50%, -50%);
            border: 2px solid rgba(255, 50, 50, 0.9);
            border-radius: 50%;
            pointer-events: none;
            z-index: 20;
            box-shadow: 0 0 8px red;
        }
        .crosshair::before, .crosshair::after {
            content: '';
            position: absolute;
            background: red;
        }
        .crosshair::before {
            top: 50%;
            left: 0;
            width: 100%;
            height: 2px;
            transform: translateY(-50%);
        }
        .crosshair::after {
            top: 0;
            left: 50%;
            width: 2px;
            height: 100%;
            transform: translateX(-50%);
        }
        #gameOverPanel {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: rgba(0,0,0,0.9);
            backdrop-filter: blur(8px);
            border: 3px solid #aa0000;
            border-radius: 30px;
            padding: 30px 40px;
            text-align: center;
            z-index: 30;
            display: none;
            flex-direction: column;
            gap: 20px;
            min-width: 280px;
            pointer-events: auto;
            font-family: 'Courier New', monospace;
        }
        #gameOverPanel h1 {
            color: #ff6666;
            font-size: 2.5rem;
            margin: 0;
            letter-spacing: 4px;
        }
        #finalScore {
            color: #ffcc44;
            font-size: 3rem;
            font-weight: bold;
            margin: 10px 0;
        }
        #highestScore {
            color: #ff6666;
            font-size: 1.2rem;
            margin-top: -10px;
            margin-bottom: 10px;
        }
        #restartBtn {
            background: #660000;
            border: none;
            color: white;
            font-size: 1.5rem;
            padding: 12px 24px;
            border-radius: 40px;
            font-family: inherit;
            font-weight: bold;
            cursor: pointer;
            transition: 0.2s;
            box-shadow: 0 0 12px darkred;
        }
        #restartBtn:hover {
            background: #aa2222;
            transform: scale(1.05);
        }
        .controls-tip {
            position: absolute;
            bottom: 70px;
            left: 15px;
            background: rgba(0,0,0,0.6);
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 12px;
            color: #ccc;
            pointer-events: none;
            font-family: monospace;
        }
        #powerupStatus {
            position: absolute;
            bottom: 80px;
            right: 15px;
            background: rgba(0,0,0,0.7);
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 14px;
            color: #ffaa44;
            font-weight: bold;
            pointer-events: none;
            z-index: 10;
            font-family: monospace;
            text-align: right;
        }
        #muteBtn {
            position: absolute;
            top: 20px;
            right: 20px;
            background: rgba(0,0,0,0.6);
            border: none;
            color: white;
            font-size: 20px;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            cursor: pointer;
            z-index: 20;
            font-family: monospace;
            backdrop-filter: blur(4px);
            pointer-events: auto;
        }
        .hit-marker {
            position: absolute;
            font-size: 20px;
            font-weight: bold;
            color: #ff6666;
            text-shadow: 1px 1px 0 black;
            pointer-events: none;
            z-index: 100;
            font-family: monospace;
            white-space: nowrap;
            transform: translate(-50%, -50%);
            animation: hitFade 0.3s ease-out forwards;
        }
        @keyframes hitFade {
            0% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
            100% { opacity: 0; transform: translate(-50%, -80%) scale(1.2); }
        }
        @media (max-width: 600px) {
            .panel { padding: 6px 16px; font-size: 1rem; }
            .panel span { font-size: 1.4rem; }
            #gameOverPanel { padding: 20px; min-width: 240px; }
            .controls-tip { font-size: 10px; bottom: 60px; }
            #powerupStatus { font-size: 10px; bottom: 70px; }
        }