:root {
     --primary: #00f5ff;
     --secondary: #7c3aed;
     --accent: #ec4899;
     --bg-dark: #0a0a0f;
     --bg-card: rgba(20, 20, 30, 0.7);
     --text: #e5e7eb;
     --text-dim: #9ca3af;
     --success: #10b981;
     --error: #ef4444;
     --warning: #f59e0b;
 }

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

 body {
     font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
     min-height: 100vh;
     background: var(--bg-dark);
     background-image:
         radial-gradient(circle at 20% 50%, rgba(124, 58, 237, 0.15) 0%, transparent 50%),
         radial-gradient(circle at 80% 80%, rgba(236, 72, 153, 0.15) 0%, transparent 50%),
         radial-gradient(circle at 40% 20%, rgba(0, 245, 255, 0.1) 0%, transparent 50%);
     display: flex;
     align-items: center;
     justify-content: center;
     padding: 20px;
     color: var(--text);
 }

 .container {
     background: var(--bg-card);
     backdrop-filter: blur(20px);
     border-radius: 24px;
     box-shadow: 0 25px 80px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.05);
     max-width: 900px;
     width: 100%;
     padding: 40px;
     animation: slideUp 0.6s ease;
     border: 1px solid rgba(255, 255, 255, 0.05);
 }

 @keyframes slideUp {
     from {
         opacity: 0;
         transform: translateY(40px);
     }

     to {
         opacity: 1;
         transform: translateY(0);
     }
 }

 .header {
     background: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
     color: white;
     padding: 24px;
     border-radius: 20px;
     margin-bottom: 32px;
     display: flex;
     justify-content: space-between;
     align-items: center;
     flex-wrap: wrap;
     gap: 20px;
     box-shadow: 0 10px 40px rgba(124, 58, 237, 0.3);
     border: 1px solid rgba(255, 255, 255, 0.1);
 }

 .player-info {
     font-size: 20px;
     font-weight: 700;
     display: flex;
     align-items: center;
     gap: 10px;
 }

 .stats {
     display: flex;
     gap: 24px;
 }

 .stat-item {
     text-align: center;
     background: rgba(255, 255, 255, 0.1);
     padding: 10px 16px;
     border-radius: 12px;
     backdrop-filter: blur(10px);
 }

 .stat-label {
     font-size: 11px;
     opacity: 0.9;
     text-transform: uppercase;
     letter-spacing: 1px;
 }

 .stat-value {
     font-size: 26px;
     font-weight: 800;
     margin-top: 4px;
 }

 .action-buttons {
     display: flex;
     gap: 12px;
 }

 .icon-btn {
     background: rgba(255, 255, 255, 0.15);
     backdrop-filter: blur(10px);
     border: 1px solid rgba(255, 255, 255, 0.2);
     color: white;
     width: 44px;
     height: 44px;
     border-radius: 12px;
     cursor: pointer;
     font-size: 20px;
     transition: all 0.3s;
 }

 .icon-btn:hover {
     background: rgba(255, 255, 255, 0.25);
     transform: scale(1.05) translateY(-2px);
     box-shadow: 0 8px 20px rgba(0, 245, 255, 0.3);
 }

 h1 {
     background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
     background-clip: text;
     text-align: center;
     margin-bottom: 16px;
     font-size: 36px;
     font-weight: 800;
     letter-spacing: -1px;
 }

 .container>div>p {
     text-align: center;
     color: var(--text-dim);
     margin-bottom: 32px;
     font-size: 16px;
 }

 .screen {
     display: none;
 }

 .screen.active {
     display: block;
 }

 .input-group {
     margin-bottom: 24px;
 }

 .input-group label {
     display: block;
     margin-bottom: 10px;
     color: var(--text);
     font-weight: 600;
     font-size: 15px;
 }

 .input-group input {
     width: 100%;
     padding: 16px 20px;
     border: 2px solid rgba(255, 255, 255, 0.1);
     border-radius: 14px;
     font-size: 16px;
     transition: all 0.3s;
     background: rgba(255, 255, 255, 0.03);
     color: var(--text);
     backdrop-filter: blur(10px);
 }

 .input-group input::placeholder {
     color: var(--text-dim);
 }

 .input-group input:focus {
     outline: none;
     border-color: var(--primary);
     background: rgba(255, 255, 255, 0.05);
     box-shadow: 0 0 0 4px rgba(0, 245, 255, 0.1);
 }

 .btn {
     background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
     color: white;
     border: none;
     padding: 16px 32px;
     border-radius: 14px;
     font-size: 16px;
     font-weight: 700;
     cursor: pointer;
     width: 100%;
     transition: all 0.3s;
     box-shadow: 0 8px 24px rgba(0, 245, 255, 0.3);
     text-transform: uppercase;
     letter-spacing: 0.5px;
 }

 .btn:hover {
     transform: translateY(-3px);
     box-shadow: 0 12px 32px rgba(0, 245, 255, 0.4);
 }

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

 .btn:disabled {
     opacity: 0.4;
     cursor: not-allowed;
     transform: none;
 }

 .type-selection {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
     gap: 24px;
     margin-top: 32px;
 }

 .type-card {
     background: linear-gradient(135deg, rgba(124, 58, 237, 0.2) 0%, rgba(236, 72, 153, 0.2) 100%);
     backdrop-filter: blur(10px);
     color: white;
     padding: 36px 24px;
     border-radius: 20px;
     text-align: center;
     cursor: pointer;
     transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
     border: 2px solid rgba(255, 255, 255, 0.1);
     position: relative;
     overflow: hidden;
 }

 .type-card::before {
     content: '';
     position: absolute;
     top: -50%;
     left: -50%;
     width: 200%;
     height: 200%;
     background: radial-gradient(circle, rgba(0, 245, 255, 0.1) 0%, transparent 70%);
     opacity: 0;
     transition: opacity 0.4s;
 }

 .type-card:hover::before {
     opacity: 1;
 }

 .type-card:hover {
     transform: translateY(-8px) scale(1.02);
     box-shadow: 0 20px 50px rgba(124, 58, 237, 0.4);
     border-color: var(--primary);
 }

 .type-card .icon {
     font-size: 56px;
     margin-bottom: 16px;
     display: block;
     filter: drop-shadow(0 4px 12px rgba(0, 245, 255, 0.5));
 }

 .type-card h3 {
     margin-bottom: 12px;
     color: white;
     font-size: 22px;
     font-weight: 700;
 }

 .type-card p {
     font-size: 14px;
     opacity: 0.85;
     color: var(--text-dim);
 }

 .audio-player {
     text-align: center;
     margin: 40px 0;
 }

 .audio-player p {
     color: var(--text-dim);
     margin-top: 12px;
     font-size: 14px;
 }

 .play-btn {
     background: linear-gradient(135deg, var(--accent) 0%, var(--secondary) 100%);
     color: white;
     border: none;
     padding: 20px 48px;
     border-radius: 50px;
     font-size: 18px;
     font-weight: 700;
     cursor: pointer;
     transition: all 0.3s;
     display: inline-flex;
     align-items: center;
     gap: 12px;
     box-shadow: 0 8px 28px rgba(236, 72, 153, 0.4);
     border: 2px solid rgba(255, 255, 255, 0.2);
 }

 .play-btn:hover {
     transform: scale(1.05);
     box-shadow: 0 12px 36px rgba(236, 72, 153, 0.5);
 }

 .play-btn:disabled {
     opacity: 0.4;
     cursor: not-allowed;
     transform: none;
 }

 .play-btn.playing {
     animation: pulse 1.5s infinite;
 }

 @keyframes pulse {

     0%,
     100% {
         transform: scale(1);
         box-shadow: 0 8px 28px rgba(236, 72, 153, 0.4);
     }

     50% {
         transform: scale(1.05);
         box-shadow: 0 12px 40px rgba(236, 72, 153, 0.6);
     }
 }

 .question-box {
     background: rgba(255, 255, 255, 0.03);
     backdrop-filter: blur(10px);
     padding: 28px;
     border-radius: 20px;
     margin: 24px 0;
     border: 1px solid rgba(255, 255, 255, 0.1);
 }

 .question-box h3 {
     color: var(--text);
     margin-bottom: 24px;
     font-size: 22px;
     font-weight: 700;
 }

 .answer-input {
     width: 100%;
     padding: 18px 24px;
     border: 2px solid var(--primary);
     border-radius: 14px;
     font-size: 18px;
     font-weight: 500;
     transition: all 0.3s;
     background: rgba(0, 245, 255, 0.05);
     color: var(--text);
     backdrop-filter: blur(10px);
 }

 .answer-input::placeholder {
     color: var(--text-dim);
 }

 .answer-input:focus {
     outline: none;
     border-color: var(--accent);
     box-shadow: 0 0 0 4px rgba(236, 72, 153, 0.15);
     background: rgba(0, 245, 255, 0.08);
 }

 .answer-input:disabled {
     background: rgba(255, 255, 255, 0.02);
     cursor: not-allowed;
     opacity: 0.5;
 }

 .feedback {
     padding: 18px 24px;
     border-radius: 14px;
     margin: 24px 0;
     font-weight: 600;
     border: 2px solid;
     backdrop-filter: blur(10px);
 }

 .feedback.correct {
     background: rgba(16, 185, 129, 0.1);
     color: var(--success);
     border-color: var(--success);
     box-shadow: 0 4px 20px rgba(16, 185, 129, 0.2);
 }

 .feedback.incorrect {
     background: rgba(239, 68, 68, 0.1);
     color: var(--error);
     border-color: var(--error);
     box-shadow: 0 4px 20px rgba(239, 68, 68, 0.2);
 }

 .loading {
     text-align: center;
     padding: 48px;
 }

 .loading p {
     color: var(--text-dim);
     margin-top: 20px;
     font-size: 16px;
 }

 .spinner {
     border: 4px solid rgba(255, 255, 255, 0.1);
     border-top: 4px solid var(--primary);
     border-radius: 50%;
     width: 56px;
     height: 56px;
     animation: spin 0.8s linear infinite;
     margin: 0 auto;
     box-shadow: 0 0 20px rgba(0, 245, 255, 0.3);
 }

 @keyframes spin {
     0% {
         transform: rotate(0deg);
     }

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

 .modal {
     display: none;
     position: fixed;
     top: 0;
     left: 0;
     width: 100%;
     height: 100%;
     background: rgba(10, 10, 15, 0.85);
     backdrop-filter: blur(8px);
     z-index: 1000;
     align-items: center;
     justify-content: center;
     padding: 20px;
 }

 .modal.active {
     display: flex;
 }

 .modal-content {
     background: var(--bg-card);
     backdrop-filter: blur(20px);
     border-radius: 24px;
     padding: 36px;
     max-width: 550px;
     width: 100%;
     max-height: 80vh;
     overflow-y: auto;
     border: 1px solid rgba(255, 255, 255, 0.1);
     box-shadow: 0 25px 80px rgba(0, 0, 0, 0.6);
 }

 .modal-content h2 {
     background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
     background-clip: text;
     margin-bottom: 28px;
     text-align: center;
     font-size: 28px;
     font-weight: 800;
 }

 .leaderboard-item {
     display: flex;
     justify-content: space-between;
     align-items: center;
     padding: 18px 20px;
     background: rgba(255, 255, 255, 0.03);
     backdrop-filter: blur(10px);
     border-radius: 14px;
     margin-bottom: 12px;
     border: 1px solid rgba(255, 255, 255, 0.05);
     transition: all 0.3s;
 }

 .leaderboard-item:hover {
     background: rgba(255, 255, 255, 0.05);
     border-color: var(--primary);
     transform: translateX(4px);
 }

 .leaderboard-rank {
     font-size: 24px;
     font-weight: 800;
     background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
     background-clip: text;
     width: 44px;
 }

 .leaderboard-info {
     flex: 1;
     padding: 0 16px;
 }

 .leaderboard-name {
     font-weight: 700;
     color: var(--text);
     font-size: 16px;
 }

 .leaderboard-streak {
     font-size: 13px;
     color: var(--text-dim);
     margin-top: 4px;
 }

 .leaderboard-score {
     font-size: 22px;
     font-weight: 800;
     color: var(--primary);
     text-shadow: 0 0 10px rgba(0, 245, 255, 0.3);
 }

 .btn-group {
     display: flex;
     gap: 12px;
     margin-top: 24px;
 }

 .btn-secondary {
     background: linear-gradient(135deg, rgba(124, 58, 237, 0.8) 0%, rgba(236, 72, 153, 0.8) 100%);
 }

 .btn-secondary:hover {
     background: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
 }

 .back-link {
     text-align: center;
     margin-top: 24px;
     color: var(--primary);
     cursor: pointer;
     font-weight: 600;
     font-size: 15px;
     transition: all 0.3s;
 }

 .back-link:hover {
     color: var(--accent);
     text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
 }

 .hint-text {
     font-size: 13px;
     color: var(--text-dim);
     margin-top: 10px;
     font-style: italic;
     opacity: 0.8;
 }

 /* Scrollbar styling */
 ::-webkit-scrollbar {
     width: 8px;
 }

 ::-webkit-scrollbar-track {
     background: rgba(255, 255, 255, 0.05);
     border-radius: 10px;
 }

 ::-webkit-scrollbar-thumb {
     background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
     border-radius: 10px;
 }

 ::-webkit-scrollbar-thumb:hover {
     background: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
 }