:root{--bg-main: #0a0c10;--bg-darker: #050608;--bg-panel: rgba(22, 27, 34, .7);--bg-card: rgba(33, 38, 45, .4);--accent-primary: #00d2ff;--accent-secondary: #ff9d00;--accent-glow: rgba(0, 210, 255, .4);--text-primary: #f0f6fc;--text-secondary: #8b949e;--text-muted: #484f58;--success: #3fb950;--error: #f85149;--border-radius-lg: 16px;--border-radius-md: 10px;--border-radius-sm: 6px;--glass-blur: blur(12px);--glass-border: 1px solid rgba(255, 255, 255, .1);--shadow-soft: 0 8px 32px 0 rgba(0, 0, 0, .37);--font-main: "Inter", system-ui, -apple-system, sans-serif;--font-heading: "Outfit", "Inter", sans-serif}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-main);background-color:var(--bg-main);color:var(--text-primary);overflow:hidden;height:100vh}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #4a90e2;outline-offset:2px}.achievements-btn{position:fixed;top:24px;right:24px;width:56px;height:56px;border-radius:50%;background:linear-gradient(135deg,var(--accent-primary) 0%,#0072ff 100%);border:none;color:#fff;font-size:24px;cursor:pointer;box-shadow:0 8px 32px #00d2ff4d;z-index:1000;transition:all .3s cubic-bezier(.175,.885,.32,1.275);display:flex;align-items:center;justify-content:center}.achievements-btn:hover{transform:scale(1.15) rotate(5deg);box-shadow:0 12px 40px #00d2ff80}.achievements-btn:active{transform:scale(.95)}.section-practice-controls{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:10px;background:#1a1a1a;border-radius:5px;margin-top:10px}.section-input{width:100px;padding:5px;background:#2a2a2a;border:1px solid #444;color:#fff;border-radius:4px}@keyframes achievementPop{0%{transform:translate(-50%,-50%) scale(.5);opacity:0}50%{transform:translate(-50%,-50%) scale(1.1)}to{transform:translate(-50%,-50%) scale(1);opacity:1}}@keyframes achievementPopOut{0%{transform:translate(-50%,-50%) scale(1);opacity:1}to{transform:translate(-50%,-50%) scale(.5);opacity:0}}.skip-link{position:absolute;top:-40px;left:0;background:#4a90e2;color:#fff;padding:8px;text-decoration:none;z-index:100}.skip-link:focus{top:0}body{background:radial-gradient(circle at center,#1a1f25,#0a0c10);color:var(--text-primary);font-family:var(--font-main);overflow:hidden;margin:0}#app{display:flex;flex-direction:column;height:100vh;position:relative;background:transparent}.song-banner{position:fixed;bottom:300px;left:50%;transform:translate(-50%);background:var(--bg-panel);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);padding:12px 32px;border-radius:var(--border-radius-lg);border:var(--glass-border);z-index:500;box-shadow:var(--shadow-soft);transition:all .5s cubic-bezier(.4,0,.2,1);display:flex;flex-direction:column;align-items:center;gap:8px}.song-banner.hidden{opacity:0;transform:translate(-50%) translateY(20px) scale(.95);pointer-events:none}#song-title{font-family:var(--font-heading);font-size:24px;font-weight:800;color:var(--accent-primary);text-shadow:0 0 20px rgba(0,210,255,.3);letter-spacing:-.01em}.key-indicator{position:absolute;bottom:200px;left:20px;font-size:18px;font-weight:700;color:#fff;text-shadow:1px 1px 2px rgba(0,0,0,.8);z-index:5}.key-indicator.hidden{opacity:0}.countdown{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);z-index:100;pointer-events:none}.countdown.hidden{display:none}#countdown-number{font-size:120px;font-weight:700;color:#4a90e2;text-shadow:0 0 20px rgba(74,144,226,.8),0 0 40px rgba(74,144,226,.6),0 0 60px rgba(74,144,226,.4);animation:countdownPulse 1s ease-out}@keyframes countdownPulse{0%{transform:scale(.5);opacity:0}50%{transform:scale(1.2);opacity:1}to{transform:scale(1);opacity:1}}.game-view{flex:1;display:flex;flex-direction:column;min-height:0;position:relative;background:transparent;z-index:10}.game-view.hidden{display:none}#game-view:not(.hidden)~.tab-content{display:none!important}#game-view:not(.hidden)~.tabs{display:none!important}.notes-area{flex:1 1 auto;min-height:200px;position:relative;background:#0000004d;overflow:hidden}#notes-canvas{width:100%;height:100%;display:block}.piano-container{height:280px;background:#0a0c10cc;position:relative;overflow:hidden;-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border-top:1px solid rgba(255,255,255,.05)}#piano-canvas{width:100%;height:100%;display:block}.tabs{display:flex;gap:12px;padding:16px 24px;background:transparent;z-index:1000;justify-content:center;position:relative}.tab-btn{padding:10px 24px;background:var(--bg-card);border:1px solid rgba(255,255,255,.05);color:var(--text-secondary);font-family:var(--font-heading);font-weight:600;font-size:14px;cursor:pointer;border-radius:30px;transition:all .4s cubic-bezier(.4,0,.2,1);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);box-shadow:0 4px 15px #0003}.tab-btn:hover{color:var(--text-primary);background:#ffffff14;transform:translateY(-2px);border-color:#ffffff1a}.tab-btn.active{color:var(--bg-main);background:var(--accent-primary);border-color:var(--accent-primary);box-shadow:0 0 20px #00d2ff66;font-weight:700}.tab-content{display:none;background:linear-gradient(180deg,var(--bg-main) 0%,var(--bg-darker) 100%);padding:24px;min-height:200px;max-height:calc(100vh - 350px);overflow-y:auto;overflow-x:hidden;position:relative;backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur)}.tab-content.active{display:block}.tab-content::-webkit-scrollbar{width:8px}.tab-content::-webkit-scrollbar-track{background:#1a1a1a;border-radius:4px}.tab-content::-webkit-scrollbar-thumb{background:#4a4a4a;border-radius:4px}.tab-content::-webkit-scrollbar-thumb:hover{background:#5a5a5a}.library-header,.search-header{display:flex;gap:16px;margin-bottom:24px;align-items:center}.search-input-wrapper{flex:1;position:relative;display:flex;align-items:center}.library-search,.search-input{flex:1;padding:12px 40px 12px 16px;background:var(--bg-panel);border:var(--glass-border);border-radius:var(--border-radius-md);color:var(--text-primary);font-family:var(--font-main);font-size:15px;transition:all .2s;backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur)}.library-search:focus,.search-input:focus{outline:none;border-color:var(--accent-primary);box-shadow:0 0 0 2px #00d2ff33;background:#ffffff14}.difficulty-filter,.search-difficulty-filter{padding:12px 16px;background:var(--bg-panel);border:var(--glass-border);border-radius:var(--border-radius-md);color:var(--text-primary);font-family:var(--font-main);font-size:14px;cursor:pointer;backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);transition:all .2s}.difficulty-filter:hover,.search-difficulty-filter:hover{background:#ffffff14;border-color:#fff3}.library-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px;padding:8px 0;overflow-y:auto;max-height:calc(100vh - 450px)}.library-grid::-webkit-scrollbar{width:8px}.library-grid::-webkit-scrollbar-track{background:#1a1a1a;border-radius:4px}.library-grid::-webkit-scrollbar-thumb{background:#4a4a4a;border-radius:4px}.library-grid::-webkit-scrollbar-thumb:hover{background:#5a5a5a}.song-card{background:var(--bg-card);border:var(--glass-border);border-radius:var(--border-radius-lg);overflow:hidden;cursor:pointer;transition:all .4s cubic-bezier(.4,0,.2,1);position:relative;backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur)}.song-card:hover{transform:translateY(-8px);background:#ffffff14;border-color:var(--accent-primary);box-shadow:0 20px 40px #0006,0 0 20px #00d2ff1a}.delete-song-btn{position:absolute;top:8px;right:8px;width:28px;height:28px;background:#f44336e6;border:none;border-radius:50%;color:#fff;font-size:20px;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .2s,background .2s;z-index:10;padding:0;line-height:1}.song-card:hover .delete-song-btn{opacity:1}.delete-song-btn:hover{background:#f44336;transform:scale(1.1)}.delete-song-btn:active{transform:scale(.95)}.delete-song-btn span{display:block;margin-top:-2px}.song-cover{width:100%;height:180px;object-fit:cover;background:var(--bg-darker);display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:13px;border-bottom:1px solid rgba(255,255,255,.05)}.song-info{padding:20px;display:flex;flex-direction:column;gap:8px}.song-title{font-family:var(--font-heading);font-size:18px;font-weight:700;color:var(--text-primary);margin-bottom:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;letter-spacing:-.02em}.song-artist{font-size:14px;color:var(--text-secondary);margin-bottom:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-weight:500}.song-difficulty{display:flex;align-items:center;gap:8px;margin-top:auto}.difficulty-stars{color:var(--accent-secondary);font-size:12px;letter-spacing:2px}.difficulty-label{text-transform:uppercase;font-size:10px;font-weight:800;letter-spacing:.1em;color:var(--text-muted)}.search-header{display:flex;gap:10px;margin-bottom:20px;flex-wrap:wrap;align-items:center}.search-results-header{padding:15px;background:#1a1a1a;border-radius:8px;margin-bottom:15px;border:1px solid #444}.results-stats{color:#aaa;font-size:14px;display:flex;justify-content:space-between;align-items:center}.search-pagination{display:flex;justify-content:center;align-items:center;gap:15px;padding:20px;margin-top:20px}.pagination-btn{padding:10px 20px;background:#4a90e2;color:#fff;border:none;border-radius:5px;cursor:pointer;font-size:14px;transition:background .3s}.pagination-btn:hover:not(:disabled){background:#357abd}.pagination-btn:disabled{background:#444;cursor:not-allowed;opacity:.5}.pagination-info{color:#aaa;font-size:14px;padding:0 15px}.search-input-wrapper{position:relative;flex:1;display:flex;align-items:center}.search-btn{padding:10px 20px;background:#4a90e2;color:#fff;border:none;border-radius:5px;cursor:pointer;font-size:14px;transition:background .3s}.search-btn:hover{background:#357abd}.search-results{display:flex;flex-direction:column;gap:15px;overflow-y:auto;overflow-x:hidden;padding-right:5px;max-height:calc(100vh - 450px)}.search-results::-webkit-scrollbar{width:8px}.search-results::-webkit-scrollbar-track{background:#1a1a1a;border-radius:4px}.search-results::-webkit-scrollbar-thumb{background:#4a4a4a;border-radius:4px}.search-results::-webkit-scrollbar-thumb:hover{background:#5a5a5a}.search-difficulty-filter{padding:10px 12px;background:#2a2a2a;border:1px solid #444;border-radius:5px;color:#fff;font-size:14px;min-width:150px;cursor:pointer}.search-difficulty-filter:focus{outline:none;border-color:#4a90e2}.search-result-item{background:#2a2a2a;padding:15px;border-radius:8px;display:flex;justify-content:space-between;align-items:flex-start;gap:15px;border:1px solid #444;transition:transform .2s,box-shadow .2s,border-color .2s}.search-result-item:hover{transform:translateY(-2px);box-shadow:0 4px 12px #4a90e233;border-color:#4a90e2}.search-result-main{display:flex;gap:15px;align-items:center;flex:1}.search-result-cover img{width:70px;height:70px;object-fit:cover;border-radius:6px;border:1px solid rgba(255,255,255,.1);box-shadow:0 2px 10px #0006}.search-result-info{flex:1}.search-result-title{font-family:var(--font-heading);font-size:18px;font-weight:700;color:var(--text-primary);margin-bottom:4px;letter-spacing:-.01em}.search-result-artist{font-size:14px;color:var(--text-secondary);white-space:pre-line;line-height:1.5;font-weight:500}.search-result-actions,.result-buttons{display:flex;gap:10px;align-items:center}.search-result-meta{display:flex;gap:12px;flex-wrap:wrap;margin-top:8px;font-size:12px;color:#bbb;align-items:center}.difficulty-badge{padding:6px 12px;border-radius:var(--border-radius-sm);font-weight:700;text-transform:uppercase;font-size:10px;letter-spacing:.05em;background:var(--bg-panel);border:1px solid rgba(255,255,255,.1);color:var(--text-primary);display:inline-flex;align-items:center;gap:6px;transition:all .3s cubic-bezier(.4,0,.2,1);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur)}.difficulty-badge.easy{background:#3fb95026;color:#3fb950;border-color:#3fb9504d}.difficulty-badge.medium{background:#ff9d0026;color:var(--accent-secondary);border-color:#ff9d004d}.difficulty-badge.hard{background:#f8514926;color:#f85149;border-color:#f851494d}.difficulty-badge.loading{background:var(--bg-card);opacity:.7}.difficulty-badge.difficulty-clickable{cursor:pointer}.difficulty-badge.difficulty-clickable:hover{transform:scale(1.05);box-shadow:0 2px 8px #0000004d}.difficulty-info-icon{font-size:10px;opacity:.8}.difficulty-modal-content{max-width:600px;max-height:90vh;overflow-y:auto}.difficulty-summary{margin-bottom:20px}.difficulty-level-display{padding:20px;border-radius:12px;text-align:center;color:#fff;box-shadow:0 4px 12px #0003}.difficulty-level-name{font-size:28px;font-weight:700;margin-bottom:10px;text-transform:uppercase}.difficulty-stars-display{font-size:24px;margin-bottom:10px;letter-spacing:4px}.difficulty-score{font-size:14px;opacity:.9}.difficulty-factors{margin:20px 0}.difficulty-factors h3{margin-bottom:15px;color:#fff;font-size:18px}.factors-list{display:flex;flex-direction:column;gap:15px}.difficulty-factor-item{background:#1a1a1a;padding:15px;border-radius:8px;border-left:4px solid #4a90e2}.factor-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.factor-name{font-weight:600;color:#fff;font-size:14px}.factor-score{font-weight:700;color:#4a90e2;font-size:14px}.factor-bar-container{height:8px;background:#2a2a2a;border-radius:4px;overflow:hidden;margin-bottom:8px}.factor-bar{height:100%;border-radius:4px;transition:width .3s ease}.factor-description{font-size:12px;color:#aaa;font-style:italic}.difficulty-explanation{margin-top:25px;padding:15px;background:#1a1a1a;border-radius:8px;border-left:4px solid #4a90e2}.difficulty-explanation h4{margin-bottom:10px;color:#fff;font-size:16px}.difficulty-explanation p{margin-bottom:10px;color:#ccc;font-size:14px}.difficulty-explanation ul{margin-left:20px;color:#ccc;font-size:13px}.difficulty-explanation li{margin-bottom:8px;line-height:1.5}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}#piano-feedback-overlay{animation:fadeIn .3s ease-in}@keyframes fadeIn{0%{opacity:0;transform:translate(-50%) translateY(-10px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.source-badge{padding:4px 8px;border-radius:12px;font-weight:500;text-transform:capitalize;font-size:11px;background:#3a3a3a;color:#aaa;border:1px solid #555;margin-left:auto}.spinner-inline{width:14px;height:14px;border-width:2px}.download-btn{padding:8px 16px;background:#4caf50;color:#fff;border:none;border-radius:5px;cursor:pointer;font-size:12px;transition:background .3s}.download-btn:hover{background:#45a049}.download-btn:disabled{background:#555;cursor:not-allowed}.preview-btn{padding:8px 16px;background:#2196f3;color:#fff;border:none;border-radius:5px;cursor:pointer;font-size:12px;transition:all .3s;display:flex;align-items:center;gap:5px}.preview-btn:hover{background:#1976d2}.preview-btn:disabled{background:#555;cursor:not-allowed}.preview-btn.preview-active{background:#f44336;animation:pulse 1.5s ease-in-out infinite}.preview-btn.preview-active:hover{background:#d32f2f}@keyframes pulse{0%,to{opacity:1}50%{opacity:.8}}.view-artist-btn{padding:8px 16px;background:#4a90e2;color:#fff;border:none;border-radius:5px;cursor:pointer;font-size:12px;transition:background .3s}.view-artist-btn:hover{background:#357abd}.view-artist-btn:disabled{background:#555;cursor:not-allowed}.loading-spinner{display:inline-block;width:20px;height:20px;border:3px solid rgba(255,255,255,.3);border-radius:50%;border-top-color:#fff;animation:spin 1s ease-in-out infinite}@keyframes spin{to{transform:rotate(360deg)}}.progress-indicator{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;color:#ccc}.progress-spinner{width:40px;height:40px;border:4px solid #333;border-top:4px solid #4a90e2;border-radius:50%;animation:spin 1s linear infinite;margin-bottom:10px}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.progress-message{font-size:14px;margin-top:10px}.progress-percent{font-size:12px;color:#888;margin-top:5px}.progress-bar-container{padding:20px}.progress-bar{width:100%;height:8px;background:#333;border-radius:4px;overflow:hidden;margin-bottom:10px}.progress-bar-fill{height:100%;background:linear-gradient(90deg,#4a90e2,#00bcd4);transition:width .3s ease}.progress-bar-text{text-align:center;font-size:12px;color:#888}.empty-state{text-align:center;padding:40px;color:#888}.controls{background:var(--bg-darker);padding:24px;display:flex;gap:32px;align-items:center;justify-content:center;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.05);z-index:100}.input-mode-controls,.practice-mode-controls{display:flex;align-items:center;gap:12px}.input-mode-controls label,.practice-mode-controls label{font-size:13px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.input-mode-select,.practice-mode-select{padding:10px 16px;background:var(--bg-panel);color:var(--text-primary);border:var(--glass-border);border-radius:var(--border-radius-md);font-family:var(--font-main);font-size:14px;cursor:pointer;transition:all .3s;backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur)}.input-mode-select:hover,.practice-mode-select:hover{background:#ffffff14;border-color:#fff3}.input-mode-select:focus,.practice-mode-select:focus{outline:none;border-color:var(--accent-primary);box-shadow:0 0 0 2px #00d2ff33}.visual-controls{display:flex;align-items:center;gap:16px}.visual-controls label{font-size:14px;color:var(--text-primary);cursor:pointer;display:flex;align-items:center;gap:8px;font-weight:500}.visual-controls input[type=checkbox]{width:20px;height:20px;cursor:pointer;accent-color:var(--accent-primary);border-radius:4px}.load-header{display:flex;gap:15px;margin-bottom:20px;align-items:center}.file-controls{display:flex;align-items:center;gap:15px;flex:1}.file-label{display:flex;align-items:center;gap:10px;background:linear-gradient(135deg,#4a90e2,#357abd);color:#fff;padding:12px 24px;border-radius:8px;cursor:pointer;transition:all .3s;font-weight:600;box-shadow:0 2px 8px #4a90e24d;border:none}.file-label:hover{background:linear-gradient(135deg,#357abd,#2a5f8f);transform:translateY(-2px);box-shadow:0 4px 12px #4a90e266}.file-label:active{transform:translateY(0)}.file-label-icon{font-size:18px}.file-label-text{font-size:14px}.loaded-file-info{display:flex;align-items:center;gap:10px;padding:10px 15px;background:#2a2a2a;border:1px solid #444;border-radius:8px;flex:1}.loaded-file-info.hidden{display:none}.loaded-file-name{flex:1;color:#fff;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.clear-file-btn{background:transparent;border:none;color:#aaa;font-size:20px;font-weight:700;cursor:pointer;padding:0;width:24px;height:24px;display:flex;align-items:center;justify-content:center;border-radius:4px;transition:all .2s}.clear-file-btn:hover{background:#ffffff1a;color:#fff}.song-progress-container{margin-top:20px;padding:20px;background:linear-gradient(135deg,#1a1a1a,#252525);border-radius:12px;border:1px solid #333}.song-progress-container.hidden{display:none}.song-progress-info{display:flex;align-items:center;gap:15px}.song-progress-time{color:#4a90e2;font-weight:600;font-size:14px;min-width:45px;text-align:center;font-variant-numeric:tabular-nums}.song-progress-bar-wrapper{flex:1}.song-progress-bar{width:100%;height:12px;background:var(--bg-card);border-radius:var(--border-radius-sm);overflow:hidden;position:relative;border:var(--glass-border)}.song-progress-fill{height:100%;background:linear-gradient(90deg,var(--accent-primary) 0%,#0072ff 100%);border-radius:var(--border-radius-sm);transition:width .1s linear;width:0%;box-shadow:0 0 15px #00d2ff66}input[type=range]{-webkit-appearance:none;appearance:none;width:100%;background:transparent;cursor:pointer}input[type=range]:focus{outline:none}input[type=range]::-webkit-slider-runnable-track{width:100%;height:6px;background:var(--bg-card);border-radius:3px;border:var(--glass-border)}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;height:18px;width:18px;border-radius:50%;background:var(--accent-primary);margin-top:-7px;box-shadow:0 0 10px #00d2ff66;border:2px solid var(--text-primary);transition:transform .2s}input[type=range]:hover::-webkit-slider-thumb{transform:scale(1.2);box-shadow:0 0 15px #00d2ff99}.playback-controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.control-btn{background:linear-gradient(135deg,var(--accent-primary) 0%,#0072ff 100%);color:var(--bg-main);border:none;padding:12px 28px;border-radius:var(--border-radius-md);cursor:pointer;font-family:var(--font-heading);font-weight:700;font-size:15px;transition:all .3s cubic-bezier(.175,.885,.32,1.275);box-shadow:0 4px 15px #00d2ff4d}.control-btn:hover:not(:disabled){transform:translateY(-2px) scale(1.05);box-shadow:0 8px 25px #00d2ff66;filter:brightness(1.1)}.control-btn:disabled{background:var(--bg-card);color:var(--text-muted);cursor:not-allowed;box-shadow:none;opacity:.5}.control-btn-exit{background:linear-gradient(135deg,#f85149,#ff7b72);color:#fff;margin-left:12px;position:relative;box-shadow:0 4px 15px #f851494d}.control-btn-exit:hover:not(:disabled){background:linear-gradient(135deg,#e53935,#ff5252);transform:translateY(-2px) scale(1.05);box-shadow:0 8px 25px #f8514980}.control-btn-exit.hidden{display:none}@media(max-width:768px){.playback-controls{flex-direction:column;align-items:stretch}.control-btn-exit{margin-left:0;margin-top:10px}}.speed-controls{display:flex;gap:5px;align-items:center}.speed-controls label{margin-right:10px}.speed-btn{background:var(--bg-panel);color:var(--text-secondary);border:var(--glass-border);padding:10px 18px;border-radius:var(--border-radius-md);cursor:pointer;font-family:var(--font-main);font-weight:600;font-size:13px;transition:all .3s;backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur)}.speed-btn:hover{background:#ffffff14;color:var(--text-primary)}.speed-btn.active{background:var(--accent-primary);color:var(--bg-main);border-color:var(--accent-primary);box-shadow:0 4px 12px #00d2ff4d}.simplification-controls{display:flex!important;align-items:center;gap:10px;visibility:visible!important;opacity:1!important}.simplification-controls label{color:#fff;font-size:14px;white-space:nowrap}.simplification-slider{width:150px;height:6px;border-radius:3px;background:#333;outline:none;-webkit-appearance:none;appearance:none;visibility:visible!important;opacity:1!important;display:block!important}.simplification-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:#4a90e2;cursor:pointer;transition:background .3s}.simplification-slider::-webkit-slider-thumb:hover{background:#357abd}.simplification-slider::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:#4a90e2;cursor:pointer;border:none;transition:background .3s}.simplification-slider::-moz-range-thumb:hover{background:#357abd}.simplification-value{color:#fff;font-size:14px;min-width:45px;text-align:left}.volume-controls{display:flex;gap:10px;align-items:center}.volume-controls label{margin-right:0;font-size:14px}.volume-slider{width:120px;height:6px;background:#3a3a3a;border-radius:3px;outline:none;-webkit-appearance:none;appearance:none}.volume-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:16px;height:16px;background:#4a90e2;border-radius:50%;cursor:pointer;transition:background .3s}.volume-slider::-webkit-slider-thumb:hover{background:#357abd}.volume-slider::-moz-range-thumb{width:16px;height:16px;background:#4a90e2;border-radius:50%;cursor:pointer;border:none;transition:background .3s}.volume-slider::-moz-range-thumb:hover{background:#357abd}.volume-value{min-width:40px;font-size:12px;color:#aaa;text-align:right}.modal{display:flex;position:fixed;z-index:1000;left:0;top:0;width:100%;height:100%;background-color:#000c;align-items:center;justify-content:center}.modal.hidden{display:none}.modal-content{background-color:#2a2a2a;padding:30px;border-radius:10px;max-width:600px;width:90%;max-height:80vh;overflow-y:auto;position:relative;box-shadow:0 4px 20px #00000080}.close-modal{position:absolute;right:20px;top:20px;font-size:28px;font-weight:700;color:#aaa;cursor:pointer}.close-modal:hover{color:#fff}.modal-content h2{margin-bottom:20px;color:#4a90e2}#stats-content{line-height:1.8}.stat-item{margin-bottom:20px;padding:20px;background:linear-gradient(135deg,#1a1a1a,#252525);border-radius:12px;border:1px solid #333;display:flex;gap:15px;transition:transform .2s,box-shadow .2s}.stat-item:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000004d}.stat-icon{font-size:32px;flex-shrink:0;display:flex;align-items:flex-start;padding-top:5px}.stat-content{flex:1}.stat-item h3{color:#4a90e2;margin-bottom:15px;font-size:1.3em;font-weight:600}.stat-item p{color:#ccc;margin:8px 0}.stat-item.best-score{background:linear-gradient(135deg,#2d5016,#1a3310);border:2px solid #4caf50}.stat-item.best-score.new-best{background:linear-gradient(135deg,#4caf50,#2d7d32);border:2px solid #66bb6a;animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{box-shadow:0 0 #4caf50b3}50%{box-shadow:0 0 0 10px #4caf5000}}.stat-value{font-size:1.1em;color:#fff}.celebration{color:#4caf50!important;font-weight:700;font-size:1.1em;margin-top:10px;animation:bounce 1s ease-in-out}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}.stat-item.performance-overview{background:linear-gradient(135deg,#1e3a5f,#1a1a1a);border:1px solid #4a90e2}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px;margin-top:15px}.stat-metric{background:#0000004d;padding:15px;border-radius:8px;display:flex;flex-direction:column;align-items:center;border:1px solid #333;transition:background .2s}.stat-metric:hover{background:#00000080}.metric-label{font-size:.9em;color:#aaa;margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px}.metric-value{font-size:1.5em;font-weight:700;color:#fff}.stat-item.challenging-notes{background:linear-gradient(135deg,#3d1a1a,#1a1a1a);border:1px solid #ff6b6b}.notes-list{list-style:none;padding:0;margin:0}.note-item{display:flex;justify-content:space-between;align-items:center;padding:12px 15px;margin:8px 0;background:#0000004d;border-radius:8px;border-left:4px solid #ff6b6b;transition:background .2s}.note-item:hover{background:#00000080}.note-name{font-weight:700;color:#fff;font-size:1.1em}.note-errors{color:#ff6b6b;font-weight:600}.stat-item.recommendations{background:linear-gradient(135deg,#2a1a3d,#1a1a1a);border:1px solid #9c27b0}.advice-list{display:flex;flex-direction:column;gap:15px;margin-top:15px}.advice-item{display:flex;gap:15px;padding:15px;background:#0000004d;border-radius:10px;border-left:4px solid;transition:transform .2s,box-shadow .2s}.advice-item:hover{transform:translate(5px);box-shadow:0 2px 8px #0000004d}.advice-item.high-priority{border-left-color:#ff6b6b;background:#ff6b6b1a}.advice-item.medium-priority{border-left-color:orange;background:#ffa5001a}.advice-item.low-priority{border-left-color:#4ecdc4;background:#4ecdc41a}.advice-icon{font-size:28px;flex-shrink:0;display:flex;align-items:center}.advice-content{flex:1}.advice-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.advice-type{font-weight:600;color:#4a90e2;text-transform:uppercase;font-size:.85em;letter-spacing:.5px}.advice-priority{font-size:.8em;padding:4px 10px;border-radius:12px;font-weight:600}.advice-item.high-priority .advice-priority{background:#ff6b6b;color:#fff}.advice-item.medium-priority .advice-priority{background:orange;color:#fff}.advice-item.low-priority .advice-priority{background:#4ecdc4;color:#fff}.advice-message{color:#ddd;line-height:1.6;margin:0}.stat-item.export-section{background:linear-gradient(135deg,#1a1a1a,#2a2a2a);border:1px solid #555}.export-buttons{display:flex;gap:10px;margin-top:15px;flex-wrap:wrap}.export-btn{padding:12px 20px;border:none;border-radius:8px;cursor:pointer;font-size:1em;font-weight:600;transition:transform .2s,box-shadow .2s;display:flex;align-items:center;gap:8px}.export-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000004d}.export-btn:active{transform:translateY(0)}.export-btn.json-btn{background:linear-gradient(135deg,#4a90e2,#357abd);color:#fff}.export-btn.json-btn:hover{background:linear-gradient(135deg,#357abd,#2a5f8f)}.export-btn.csv-btn{background:linear-gradient(135deg,#4caf50,#388e3c);color:#fff}.export-btn.csv-btn:hover{background:linear-gradient(135deg,#388e3c,#2e7d32)}.stat-item.practice-exercises{background:linear-gradient(135deg,#1a3a2a,#1a1a1a);border:1px solid #4caf50}.practice-intro{color:#ccc;margin-bottom:20px;font-size:.95em;line-height:1.6}.exercises-list{display:flex;flex-direction:column;gap:15px;margin-top:15px}.exercise-item{display:flex;flex-direction:column;gap:15px;padding:20px;background:#0006;border-radius:12px;border-left:4px solid #4caf50;transition:transform .2s,box-shadow .2s,background .2s}.exercise-item:hover{transform:translate(5px);box-shadow:0 4px 12px #0006;background:#00000080}.exercise-item.high-priority{border-left-color:#ff6b6b;background:#ff6b6b1a}.exercise-item.high-priority:hover{background:#ff6b6b26}.exercise-item.medium-priority{border-left-color:orange;background:#ffa5001a}.exercise-item.medium-priority:hover{background:#ffa50026}.exercise-item.low-priority{border-left-color:#4ecdc4;background:#4ecdc41a}.exercise-item.low-priority:hover{background:#4ecdc426}.exercise-header{display:flex;gap:15px;align-items:flex-start}.exercise-icon{font-size:2.5em;line-height:1;flex-shrink:0}.exercise-info{flex:1;display:flex;flex-direction:column;gap:8px}.exercise-title{color:#4a90e2;font-size:1.2em;font-weight:600;margin:0}.exercise-description{color:#ddd;font-size:.95em;line-height:1.5;margin:0}.exercise-meta{display:flex;gap:15px;align-items:center;flex-wrap:wrap;margin-top:8px}.exercise-time{color:#aaa;font-size:.85em;display:flex;align-items:center;gap:5px}.exercise-priority{font-size:.8em;padding:4px 10px;border-radius:12px;font-weight:600}.exercise-item.high-priority .exercise-priority{background:#ff6b6b;color:#fff}.exercise-item.medium-priority .exercise-priority{background:orange;color:#fff}.exercise-item.low-priority .exercise-priority{background:#4ecdc4;color:#fff}.exercise-btn{padding:12px 24px;background:linear-gradient(135deg,#4caf50,#388e3c);color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:1em;font-weight:600;transition:transform .2s,box-shadow .2s,background .2s;align-self:flex-start;display:flex;align-items:center;gap:8px}.exercise-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #4caf5066;background:linear-gradient(135deg,#388e3c,#2e7d32)}.exercise-btn:active{transform:translateY(0)}.exercise-btn:focus-visible{outline:3px solid #4caf50;outline-offset:2px}@media(max-width:768px){.stats-grid{grid-template-columns:1fr}.stat-item{flex-direction:column;text-align:center}.stat-icon{justify-content:center}.advice-item{flex-direction:column;text-align:center}.advice-header{flex-direction:column;gap:5px}.export-buttons{flex-direction:column}.export-btn{width:100%;justify-content:center}.exercise-item{padding:15px}.exercise-header{flex-direction:column;align-items:center;text-align:center}.exercise-meta{justify-content:center;flex-direction:column;gap:8px}.exercise-btn{width:100%;justify-content:center}}.tour-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#000000b3;z-index:10000;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.tour-overlay.hidden{display:none}.tour-modal{position:fixed;background:linear-gradient(135deg,#2a2a2a,#1a1a1a);border-radius:12px;box-shadow:0 8px 32px #00000080;z-index:10001;max-width:600px;width:90%;max-height:85vh;height:auto;min-height:300px;display:flex;flex-direction:column;border:2px solid #4a90e2;top:50%;left:50%;transform:translate(-50%,-50%);overflow:hidden}.tour-modal.hidden{display:none!important}.tour-content{display:flex;flex-direction:column;height:100%;max-height:85vh;overflow:hidden}.tour-header{padding:20px;border-bottom:1px solid #333;display:flex;justify-content:space-between;align-items:center;background:linear-gradient(135deg,#1e3a5f,#2a2a2a);border-radius:12px 12px 0 0;flex-shrink:0;min-height:60px}.tour-header h2{margin:0;color:#4a90e2;font-size:1.5em}.tour-close{background:none;border:none;color:#aaa;font-size:28px;cursor:pointer;padding:0;width:30px;height:30px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:all .2s}.tour-close:hover{background:#ffffff1a;color:#fff}.tour-body{padding:25px;overflow-y:auto;overflow-x:hidden;flex:1;line-height:1.6;min-height:0;scrollbar-width:thin;scrollbar-color:#4a90e2 #1a1a1a}.tour-body::-webkit-scrollbar{width:10px}.tour-body::-webkit-scrollbar-track{background:#1a1a1a80;border-radius:5px;margin:5px 0}.tour-body::-webkit-scrollbar-thumb{background:linear-gradient(135deg,#4a90e2,#357abd);border-radius:5px;border:2px solid rgba(26,26,26,.3)}.tour-body::-webkit-scrollbar-thumb:hover{background:linear-gradient(135deg,#357abd,#2a5f8f)}.tour-body p{color:#ddd;margin-bottom:15px}.tour-body ul{color:#ddd;margin-left:20px;margin-bottom:15px}.tour-body li{margin-bottom:8px}.tour-body strong{color:#4a90e2}.tour-body kbd{background:linear-gradient(135deg,#333,#222);border:1px solid #555;border-radius:4px;padding:4px 8px;font-family:Courier New,monospace;font-size:.9em;color:#fff;box-shadow:0 2px 4px #0000004d;margin:0 2px}.tour-body .tip{background:#4ecdc41a;border-left:4px solid #4ecdc4;padding:12px;margin-top:15px;border-radius:4px}.keyboard-mapping-guide{margin-top:15px}.keyboard-mapping-guide h4{color:#4a90e2;margin-bottom:15px}.keyboard-layout{background:#0000004d;padding:15px;border-radius:8px;margin-top:10px}.keyboard-row{margin-bottom:15px;padding-bottom:15px;border-bottom:1px solid #333}.keyboard-row:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}.keyboard-row strong{display:block;color:#4a90e2;margin-bottom:8px;font-size:.95em}.key-group{display:flex;gap:5px;margin:10px 0;flex-wrap:wrap}.key-note{display:block;color:#aaa;font-size:.85em;font-family:Courier New,monospace;margin-top:5px}.tour-footer{padding:20px;border-top:1px solid #333;display:flex;justify-content:space-between;align-items:center;background:#0003;border-radius:0 0 12px 12px;flex-wrap:wrap;gap:15px;flex-shrink:0;min-height:80px}.tour-progress{color:#aaa;font-size:.9em}.tour-buttons{display:flex;gap:10px;flex-wrap:wrap}.tour-btn{padding:10px 20px;border:none;border-radius:6px;cursor:pointer;font-size:1em;font-weight:600;transition:all .2s}.tour-btn-primary{background:linear-gradient(135deg,#4a90e2,#357abd);color:#fff}.tour-btn-primary:hover{background:linear-gradient(135deg,#357abd,#2a5f8f);transform:translateY(-2px);box-shadow:0 4px 12px #4a90e266}.tour-btn-secondary{background:#ffffff1a;color:#ddd;border:1px solid #555}.tour-btn-secondary:hover:not(:disabled){background:#fff3;border-color:#777}.tour-btn-secondary:disabled{opacity:.5;cursor:not-allowed}.tour-btn-link{background:none;color:#4a90e2;text-decoration:underline}.tour-btn-link:hover{color:#357abd}@media(max-width:768px){.tour-modal{width:95%;max-height:90vh}.tour-header h2{font-size:1.2em}.tour-body{padding:15px;max-height:calc(90vh - 140px)}.tour-footer{flex-direction:column;align-items:stretch;min-height:100px}.tour-buttons{justify-content:stretch}.tour-btn{flex:1}.key-group{justify-content:center}.achievements-btn{top:10px;right:10px;width:45px;height:45px;font-size:20px}.tour-btn-help{top:10px;left:10px;padding:8px 12px!important;font-size:12px!important}.song-progress-info{flex-direction:column;gap:10px}.song-progress-time{min-width:auto;font-size:12px}.load-header,.file-controls{flex-direction:column;align-items:stretch}}.login-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#000000d9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:9999;display:flex;align-items:center;justify-content:center;transition:opacity .5s ease,visibility .5s}.login-overlay.hidden{opacity:0;visibility:hidden}.login-card{width:90%;max-width:500px;padding:3rem;text-align:center;border-radius:var(--border-radius-lg);background:var(--bg-panel);border:var(--glass-border);box-shadow:var(--shadow-soft)}.login-card h1{font-family:var(--font-heading);font-size:2rem;margin-bottom:1rem;background:linear-gradient(135deg,var(--accent-primary),#fff);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.login-card p{color:var(--text-secondary);margin-bottom:2rem}.login-input-group{display:flex;flex-direction:column;gap:1rem}#username-input{padding:1rem;border-radius:var(--border-radius-md);border:1px solid rgba(255,255,255,.1);background:#0000004d;color:#fff;font-size:1.1rem;text-align:center}#username-input:focus{outline:none;border-color:var(--accent-primary);box-shadow:0 0 10px var(--accent-glow)}.login-btn{padding:1rem;border-radius:var(--border-radius-md);border:none;background:linear-gradient(135deg,var(--accent-primary),#0072ff);color:#fff;font-weight:600;font-size:1.1rem;cursor:pointer;transition:transform .2s,box-shadow .2s}.login-btn:hover{transform:translateY(-2px);box-shadow:0 4px 15px var(--accent-glow)}.login-error{color:var(--error);margin-top:1rem;font-size:.9rem}.profile-bar{position:fixed;top:20px;left:20px;z-index:500;background:var(--bg-panel);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);padding:.6rem 1.2rem;border-radius:50px;border:var(--glass-border);display:flex;align-items:center;gap:1rem;font-size:.9rem;box-shadow:var(--shadow-soft)}.logout-btn{background:#ffffff1a;border:none;color:var(--text-secondary);padding:.3rem .8rem;border-radius:20px;cursor:pointer;font-size:.8rem;transition:all .2s}.logout-btn:hover{background:var(--error);color:#fff}