@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&display=swap');
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Orbitron', monospace;
            background: radial-gradient(ellipse at center, #0f0f23 0%, #050507 100%);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            overflow: hidden;
            color: #fff;
        }

        .game-container {
            position: relative;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 0 100px rgba(0, 255, 255, 0.3), inset 0 0 50px rgba(0, 100, 255, 0.1);
            background: linear-gradient(135deg, rgba(15, 15, 35, 0.9), rgba(5, 5, 20, 0.95));
            border: 1px solid rgba(0, 255, 255, 0.2);
            backdrop-filter: blur(10px);
        }

        canvas {
            display: block;
            background: radial-gradient(ellipse at 50% 20%, #001a33 0%, #000510 100%);
        }

        .ui-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 10;
        }

        .hud {
            position: absolute;
            top: 20px;
            left: 20px;
            right: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 16px;
            font-weight: 700;
        }

        .hud-left, .hud-right {
            display: flex;
            gap: 20px;
            align-items: center;
        }

        .hud-item {
            background: rgba(0, 20, 40, 0.8);
            padding: 8px 15px;
            border-radius: 25px;
            border: 1px solid rgba(0, 255, 255, 0.3);
            color: #00ffff;
            text-shadow: 0 0 10px #00ffff;
            backdrop-filter: blur(5px);
            font-size: 14px;
            min-width: 80px;
            text-align: center;
        }

        .lives-display {
            display: flex;
            gap: 5px;
            align-items: center;
            background: rgba(40, 0, 0, 0.8);
            padding: 8px 15px;
            border-radius: 25px;
            border: 1px solid rgba(255, 100, 100, 0.3);
            color: #ff6b6b;
        }

        .life-icon {
            width: 12px;
            height: 12px;
            background: #ff6b6b;
            border-radius: 50%;
            box-shadow: 0 0 8px #ff6b6b;
        }

        .power-status {
            position: absolute;
            top: 80px;
            left: 20px;
            display: flex;
            flex-direction: column;
            gap: 8px;
            max-width: 200px;
        }

        .power-item {
            background: rgba(0, 0, 0, 0.7);
            border: 1px solid;
            border-radius: 20px;
            padding: 8px 12px;
            font-size: 12px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            opacity: 0;
            transform: translateX(-20px);
            transition: all 0.3s ease;
        }

        .power-item.active {
            opacity: 1;
            transform: translateX(0);
        }

        .power-shield { border-color: #00ffff; color: #00ffff; }
        .power-rapid { border-color: #ff6b6b; color: #ff6b6b; }
        .power-triple { border-color: #ffa500; color: #ffa500; }

        .combo-display {
            position: absolute;
            top: 40%;
            right: 30px;
            background: linear-gradient(45deg, #ff6b6b, #ff0040);
            color: white;
            font-size: 24px;
            font-weight: 900;
            padding: 15px 25px;
            border-radius: 15px;
            border: 2px solid #fff;
            text-shadow: 0 0 15px rgba(255, 107, 107, 0.8);
            box-shadow: 0 0 30px rgba(255, 107, 107, 0.5);
            transform: scale(0);
            transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
        }

        .combo-display.show {
            transform: scale(1);
        }

        .boss-warning {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: linear-gradient(45deg, #ff0000, #8b0000);
            color: white;
            font-size: 32px;
            font-weight: 900;
            padding: 30px 50px;
            border-radius: 20px;
            text-align: center;
            border: 3px solid #fff;
            box-shadow: 0 0 50px rgba(255, 0, 0, 0.8);
            opacity: 0;
            transform: translate(-50%, -50%) scale(0.5);
            transition: all 0.5s ease;
        }

        .boss-warning.show {
            opacity: 1;
            transform: translate(-50%, -50%) scale(1);
        }

        .boss-health {
            position: absolute;
            top: 60px;
            left: 50%;
            transform: translateX(-50%);
            width: 400px;
            height: 12px;
            background: rgba(0, 0, 0, 0.8);
            border: 2px solid #ff0000;
            border-radius: 8px;
            overflow: hidden;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .boss-health.show {
            opacity: 1;
        }

        .boss-health-bar {
            height: 100%;
            background: linear-gradient(90deg, #ff0000, #ff6b6b);
            border-radius: 4px;
            box-shadow: 0 0 20px #ff0000;
            transition: width 0.3s ease;
        }

        .boss-health-text {
            position: absolute;
            top: -25px;
            left: 50%;
            transform: translateX(-50%);
            color: #ff0000;
            font-size: 14px;
            font-weight: 700;
            text-shadow: 0 0 10px #ff0000;
        }

        .start-screen {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(0, 10, 30, 0.95), rgba(5, 5, 15, 0.98));
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
            z-index: 100;
            backdrop-filter: blur(10px);
        }

        .game-title {
            font-size: 56px;
            font-weight: 900;
            margin-bottom: 20px;
            background: linear-gradient(45deg, #00ffff, #ff6b6b, #4ecdc4, #ffa500);
            background-size: 300% 300%;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            animation: gradientShift 4s ease-in-out infinite;
            text-shadow: 0 0 30px rgba(255, 255, 255, 0.1);
            letter-spacing: 3px;
        }

        .game-subtitle {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 40px;
            font-weight: 400;
        }

        @keyframes gradientShift {
            0%, 100% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
        }

        .controls-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 40px;
            max-width: 500px;
        }

        .control-item {
            background: rgba(0, 20, 40, 0.6);
            padding: 15px;
            border-radius: 15px;
            border: 1px solid rgba(0, 255, 255, 0.2);
            backdrop-filter: blur(5px);
        }

        .control-key {
            color: #00ffff;
            font-weight: 700;
            font-size: 16px;
        }

        .control-desc {
            color: rgba(255, 255, 255, 0.8);
            font-size: 14px;
            margin-top: 5px;
        }

        .start-btn {
            background: linear-gradient(45deg, #00ffff, #0080ff);
            border: none;
            padding: 20px 50px;
            font-size: 20px;
            font-weight: 700;
            color: #000;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 10px 30px rgba(0, 255, 255, 0.3);
            font-family: 'Orbitron', monospace;
            letter-spacing: 1px;
        }

        .start-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 40px rgba(0, 255, 255, 0.5);
            background: linear-gradient(45deg, #00e6e6, #0099ff);
        }

        .game-over {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
            background: linear-gradient(135deg, rgba(0, 0, 0, 0.9), rgba(20, 20, 40, 0.9));
            padding: 50px;
            border-radius: 25px;
            border: 2px solid #00ffff;
            box-shadow: 0 0 50px rgba(0, 255, 255, 0.3);
            backdrop-filter: blur(15px);
            display: none;
            z-index: 100;
            min-width: 400px;
        }

        .game-over h2 {
            font-size: 36px;
            margin-bottom: 20px;
            color: #ff6b6b;
            text-shadow: 0 0 15px #ff6b6b;
            font-weight: 900;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin: 30px 0;
        }

        .stat-item {
            background: rgba(0, 20, 40, 0.5);
            padding: 15px;
            border-radius: 10px;
            border: 1px solid rgba(0, 255, 255, 0.2);
        }

        .stat-label {
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
        }

        .stat-value {
            color: #00ffff;
            font-size: 24px;
            font-weight: 700;
            margin-top: 5px;
        }

        .restart-btn {
            background: linear-gradient(45deg, #ff6b6b, #ff4757);
            border: none;
            padding: 15px 40px;
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            border-radius: 25px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-family: 'Orbitron', monospace;
            letter-spacing: 1px;
        }

        .restart-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(255, 107, 107, 0.4);
        }

        .tutorial-hint {
            position: absolute;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%);
            background: rgba(0, 20, 40, 0.8);
            padding: 10px 20px;
            border-radius: 20px;
            border: 1px solid rgba(0, 255, 255, 0.3);
            color: #00ffff;
            font-size: 12px;
            opacity: 0;
            animation: fadeInOut 3s ease-in-out infinite;
        }

        @keyframes fadeInOut {
            0%, 100% { opacity: 0; }
            50% { opacity: 1; }
        }