* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
            min-height: 100vh;
            color: #333;
            overflow-x: hidden;
        }

        /* Animated Background */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.3) 0%, transparent 50%);
            animation: backgroundFloat 20s ease-in-out infinite;
            z-index: -1;
        }

        @keyframes backgroundFloat {
            0%, 100% { opacity: 1; transform: translateY(0px); }
            50% { opacity: 0.8; transform: translateY(-20px); }
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
        }

        /* Enhanced Header */
        header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px);
            border-radius: 25px;
            padding: 30px;
            margin-bottom: 30px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.3);
            position: relative;
            overflow: hidden;
        }

        header::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
            animation: shimmer 3s infinite;
        }

        @keyframes shimmer {
            0% { left: -100%; }
            100% { left: 100%; }
        }

        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 25px;
            position: relative;
            z-index: 1;
        }

        .logo-section {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .logo-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(45deg, #667eea, #764ba2, #f093fb);
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 40px;
            animation: logoFloat 3s ease-in-out infinite;
            box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
        }

        @keyframes logoFloat {
            0%, 100% { transform: translateY(0px) rotate(0deg); }
            50% { transform: translateY(-10px) rotate(5deg); }
        }

        .logo-text h1 {
            color: #1e3c72;
            font-size: 2.8em;
            font-weight: 800;
            margin: 0;
            background: linear-gradient(45deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .logo-text p {
            color: #666;
            font-size: 1.1em;
            margin: 8px 0 0 0;
        }

        .user-stats {
            display: flex;
            gap: 15px;
            align-items: center;
            flex-wrap: wrap;
        }

        .stat-card {
            background: linear-gradient(45deg, #667eea, #764ba2);
            color: white;
            padding: 15px 25px;
            border-radius: 20px;
            text-align: center;
            min-width: 120px;
            position: relative;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
        }

        .stat-card::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
            animation: statGlow 2s ease-in-out infinite alternate;
        }

        @keyframes statGlow {
            0% { opacity: 0.5; }
            100% { opacity: 1; }
        }

        .stat-value {
            font-size: 1.8em;
            font-weight: bold;
            position: relative;
            z-index: 1;
        }

        .stat-label {
            font-size: 0.9em;
            opacity: 0.9;
            position: relative;
            z-index: 1;
        }

        /* Enhanced Login Form */
        .login-container {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 70vh;
        }

        .login-form {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px);
            border-radius: 30px;
            padding: 60px;
            text-align: center;
            box-shadow: 0 30px 80px rgba(0, 0, 0, 0.15);
            max-width: 500px;
            width: 100%;
            border: 1px solid rgba(255, 255, 255, 0.3);
            position: relative;
            overflow: hidden;
        }

        .login-form::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 5px;
            background: linear-gradient(90deg, #667eea, #764ba2, #f093fb, #667eea);
            background-size: 300% 100%;
            animation: gradientMove 3s ease infinite;
        }

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

        /* Enhanced Buttons */
        .btn {
            background: linear-gradient(45deg, #667eea, #764ba2);
            color: white;
            padding: 18px 35px;
            border: none;
            border-radius: 30px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.4s ease;
            margin: 12px;
            min-width: 160px;
            position: relative;
            overflow: hidden;
        }

        .btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
            transition: left 0.5s;
        }

        .btn:hover::before {
            left: 100%;
        }

        .btn:hover {
            transform: translateY(-3px) scale(1.05);
            box-shadow: 0 15px 35px rgba(102, 126, 234, 0.4);
        }

        .btn.secondary {
            background: linear-gradient(45deg, #4ecdc4, #44a08d);
        }

        .btn.danger {
            background: linear-gradient(45deg, #e74c3c, #c0392b);
        }

        /* Enhanced Game Cards */
        .games-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }

        .game-card {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px);
            border-radius: 25px;
            padding: 35px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
            transition: all 0.4s ease;
            cursor: pointer;
            position: relative;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.3);
        }

        .game-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 5px;
            background: linear-gradient(90deg, #667eea, #764ba2);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.4s ease;
        }

        .game-card:hover::before {
            transform: scaleX(1);
        }

        .game-card:hover {
            transform: translateY(-15px) scale(1.02);
            box-shadow: 0 30px 80px rgba(0, 0, 0, 0.2);
        }

        .game-icon {
            width: 100px;
            height: 100px;
            margin: 0 auto 25px;
            background: linear-gradient(45deg, #667eea, #764ba2);
            border-radius: 25px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 50px;
            color: white;
            animation: iconFloat 4s ease-in-out infinite;
        }

        @keyframes iconFloat {
            0%, 100% { transform: translateY(0px) rotate(0deg); }
            25% { transform: translateY(-5px) rotate(3deg); }
            75% { transform: translateY(5px) rotate(-3deg); }
        }

        .game-title {
            color: #1e3c72;
            font-size: 1.6em;
            font-weight: 700;
            margin-bottom: 15px;
            text-align: center;
        }

        .game-description {
            color: #666;
            line-height: 1.6;
            margin-bottom: 25px;
            text-align: center;
        }

        /* Enhanced Progress Visualization */
        .progress-ring {
            display: flex;
            justify-content: center;
            margin: 25px 0;
        }

        .progress-circle {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 5px;
            font-weight: bold;
            font-size: 0.9em;
            position: relative;
            overflow: hidden;
        }

        .progress-circle.completed {
            background: linear-gradient(45deg, #4ecdc4, #44a08d);
            color: white;
            animation: completedPulse 2s ease-in-out infinite alternate;
        }

        .progress-circle.current {
            background: linear-gradient(45deg, #667eea, #764ba2);
            color: white;
            animation: currentBeat 1.5s ease-in-out infinite;
        }

        .progress-circle.locked {
            background: #e1e5e9;
            color: #999;
        }

        @keyframes completedPulse {
            0% { box-shadow: 0 0 0 0 rgba(78, 205, 196, 0.7); }
            100% { box-shadow: 0 0 0 10px rgba(78, 205, 196, 0); }
        }

        @keyframes currentBeat {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.1); }
        }

        /* Enhanced Training Interface */
        .training-interface {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px);
            border-radius: 30px;
            padding: 45px;
            margin-top: 30px;
            box-shadow: 0 30px 80px rgba(0, 0, 0, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.3);
            position: relative;
            overflow: hidden;
        }

        .training-interface::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 5px;
            background: linear-gradient(90deg, #667eea, #764ba2, #f093fb);
            background-size: 300% 100%;
            animation: progressFlow 3s linear infinite;
        }

        @keyframes progressFlow {
            0% { background-position: 0% 50%; }
            100% { background-position: 300% 50%; }
        }

        .training-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 35px;
            flex-wrap: wrap;
            gap: 25px;
        }

        .training-title {
            color: #1e3c72;
            font-size: 2.2em;
            font-weight: 700;
        }

        .training-stats {
            display: flex;
            gap: 20px;
            align-items: center;
            flex-wrap: wrap;
        }

        .stat-badge {
            background: linear-gradient(45deg, #f093fb, #f5576c);
            color: white;
            padding: 12px 20px;
            border-radius: 20px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            animation: badgeGlow 3s ease-in-out infinite alternate;
        }

        @keyframes badgeGlow {
            0% { box-shadow: 0 0 0 0 rgba(240, 147, 251, 0.7); }
            100% { box-shadow: 0 0 0 8px rgba(240, 147, 251, 0); }
        }

        /* Enhanced Question Container */
        .question-container {
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
            border-radius: 20px;
            padding: 40px;
            margin-bottom: 35px;
            position: relative;
            overflow: hidden;
            border: 2px solid rgba(102, 126, 234, 0.1);
        }

        .question-container::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: conic-gradient(transparent, rgba(102, 126, 234, 0.1), transparent);
            animation: rotate 20s linear infinite;
            z-index: 0;
        }

        @keyframes rotate {
            100% { transform: rotate(360deg); }
        }

        .question-content {
            position: relative;
            z-index: 1;
        }

        .question-text {
            font-size: 1.4em;
            color: #333;
            margin-bottom: 30px;
            text-align: center;
            font-weight: 600;
        }

        /* Enhanced Audio Controls */
        .audio-comparison {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin: 40px 0;
            flex-wrap: wrap;
        }

        .audio-control {
            text-align: center;
            background: white;
            padding: 30px;
            border-radius: 20px;
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
            min-width: 180px;
            position: relative;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .audio-control:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
        }

        .audio-btn {
            width: 100px;
            height: 100px;
            border: none;
            border-radius: 50%;
            font-size: 40px;
            cursor: pointer;
            margin: 0 auto 20px;
            transition: all 0.4s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .audio-btn.original {
            background: linear-gradient(45deg, #4ecdc4, #44a08d);
            color: white;
        }

        .audio-btn.processed {
            background: linear-gradient(45deg, #f093fb, #f5576c);
            color: white;
        }

        .audio-btn:hover {
            transform: scale(1.1);
        }

        .audio-btn.playing {
            animation: audioPlaying 1s ease-in-out infinite;
        }

        @keyframes audioPlaying {
            0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.7); }
            50% { transform: scale(1.1); box-shadow: 0 0 0 20px rgba(102, 126, 234, 0); }
        }

        /* Enhanced Answer Options */
        .answer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }

        .answer-option {
            background: white;
            border: 3px solid #e1e5e9;
            border-radius: 15px;
            padding: 20px 15px;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
            font-weight: 600;
            position: relative;
            overflow: hidden;
        }

        .answer-option::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
            transition: left 0.3s;
        }

        .answer-option:hover::before {
            left: 100%;
        }

        .answer-option:hover {
            border-color: #667eea;
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(102, 126, 234, 0.2);
        }

        .answer-option.selected {
            border-color: #667eea;
            background: rgba(102, 126, 234, 0.1);
            transform: scale(1.05);
        }

        .answer-option.correct {
            border-color: #4ecdc4;
            background: rgba(78, 205, 196, 0.2);
            animation: correctAnswer 0.6s ease-in-out;
        }

        .answer-option.close {
            border-color: #f39c12;
            background: rgba(243, 156, 18, 0.2);
            animation: closeAnswer 0.6s ease-in-out;
        }

        .answer-option.incorrect {
            border-color: #e74c3c;
            background: rgba(231, 76, 60, 0.2);
            animation: incorrectAnswer 0.6s ease-in-out;
        }

        @keyframes celebrationBounce {
            0% { transform: translate(-50%, -50%) scale(0); opacity: 0; }
            50% { transform: translate(-50%, -50%) scale(1.2); opacity: 1; }
            100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
        }

        @keyframes scorePositive {
            0% { transform: scale(1); }
            50% { transform: scale(1.2); box-shadow: 0 0 20px rgba(39, 174, 96, 0.6); }
            100% { transform: scale(1); }
        }

        @keyframes scoreNegative {
            0% { transform: translateX(0); }
            25% { transform: translateX(-5px); }
            50% { transform: translateX(5px); }
            75% { transform: translateX(-5px); }
            100% { transform: translateX(0); }
        }

        /* Enhanced answer options with hints */
        .answer-option.hint {
            border: 3px dashed #9b59b6;
            background: rgba(155, 89, 182, 0.1);
            position: relative;
        }

        .answer-option.hint::after {
            content: '💡';
            position: absolute;
            top: -5px;
            right: -5px;
            background: #9b59b6;
            color: white;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 10px;
        }

        .answer-option.disabled {
            opacity: 0.5;
            pointer-events: none;
        }

        @keyframes correctAnswer {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.1); }
        }

        @keyframes closeAnswer {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }

        @keyframes incorrectAnswer {
            0%, 25%, 50%, 75%, 100% { transform: translateX(0); }
            12.5%, 37.5%, 62.5%, 87.5% { transform: translateX(-5px); }
        }

        /* Enhanced Visual Feedback */
        .frequency-visualizer {
            margin: 30px 0;
            text-align: center;
        }

        .frequency-bars {
            display: flex;
            justify-content: center;
            align-items: end;
            height: 200px;
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
            border-radius: 15px;
            padding: 20px;
            gap: 8px;
            margin: 20px 0;
            position: relative;
            overflow: hidden;
        }

        .frequency-bars::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, #667eea, #764ba2, #f093fb);
            animation: waveflow 2s ease-in-out infinite;
        }

        @keyframes waveflow {
            0%, 100% { opacity: 0.3; }
            50% { opacity: 1; }
        }

        .freq-bar {
            width: 25px;
            background: linear-gradient(to top, #667eea, #764ba2);
            border-radius: 5px 5px 0 0;
            transition: all 0.3s ease;
            position: relative;
        }

        .freq-bar.active {
            background: linear-gradient(to top, #f093fb, #f5576c);
            animation: barPulse 1.5s ease-in-out infinite;
        }

        @keyframes barPulse {
            0%, 100% { transform: scaleY(1); }
            50% { transform: scaleY(1.2); }
        }

        /* Enhanced Progress Tracking */
        .progress-tracker {
            background: rgba(255, 255, 255, 0.9);
            border-radius: 20px;
            padding: 25px;
            margin: 30px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }

        .progress-bar-container {
            flex: 1;
            margin: 0 20px;
        }

        .progress-bar-bg {
            height: 8px;
            background: #e1e5e9;
            border-radius: 10px;
            overflow: hidden;
            position: relative;
        }

        .progress-bar-fill {
            height: 100%;
            background: linear-gradient(90deg, #4ecdc4, #44a08d);
            border-radius: 10px;
            transition: width 0.5s ease;
            position: relative;
        }

        .progress-bar-fill::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            bottom: 0;
            right: 0;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
            animation: progressShine 2s ease-in-out infinite;
        }

        @keyframes progressShine {
            0% { transform: translateX(-100%); }
            100% { transform: translateX(100%); }
        }

        /* Enhanced Result Popup */
        .result-popup {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.8);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 1000;
            backdrop-filter: blur(10px);
        }

        .popup-content {
            background: white;
            padding: 60px;
            border-radius: 30px;
            text-align: center;
            max-width: 600px;
            width: 90%;
            box-shadow: 0 30px 80px rgba(0, 0, 0, 0.3);
            position: relative;
            overflow: hidden;
        }

        .popup-content::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 5px;
            background: linear-gradient(90deg, #4ecdc4, #667eea, #f093fb);
            animation: resultGlow 2s ease-in-out infinite;
        }

        @keyframes resultGlow {
            0%, 100% { opacity: 0.5; }
            50% { opacity: 1; }
        }

        .result-icon {
            font-size: 100px;
            margin-bottom: 25px;
            animation: resultIcon 0.8s ease-out;
        }

        @keyframes resultIcon {
            0% { transform: scale(0) rotate(180deg); opacity: 0; }
            100% { transform: scale(1) rotate(0deg); opacity: 1; }
        }

        .result-score {
            font-size: 3.5em;
            font-weight: bold;
            margin: 25px 0;
            background: linear-gradient(45deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                padding: 15px;
            }
            
            .header-content {
                flex-direction: column;
                text-align: center;
            }
            
            .games-grid {
                grid-template-columns: 1fr;
            }
            
            .audio-comparison {
                flex-direction: column;
                align-items: center;
            }
            
            .answer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .training-header {
                flex-direction: column;
                text-align: center;
            }

            .logo-text h1 {
                font-size: 2.2em;
            }

            .login-form {
                padding: 40px;
            }
        }

        .hidden {
            display: none;
        }

        .fade-in {
            animation: fadeIn 0.8s ease-out;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }