*,*:before,*:after{box-sizing:border-box}:root{--bg: #ffffff;--bg-subtle: #f8f7f4;--bg-elevated: #fafafa;--bg-card: #ffffff;--fg: #1a1a1a;--fg-muted: #5c5c5c;--fg-softer: #8a8a8a;--accent: #2d2d2d;--accent-hover: #1a1a1a;--accent-soft: rgba(45, 45, 45, .08);--accent-gold: #c9a227;--accent-gold-soft: rgba(201, 162, 39, .12);--accent-gradient: linear-gradient(135deg, #2d2d2d 0%, #4a4a4a 50%, #c9a227 100%);--border: rgba(0, 0, 0, .06);--border-strong: rgba(0, 0, 0, .12);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .06);--shadow-lg: 0 12px 40px rgba(0, 0, 0, .08);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--radius-full: 9999px;--font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "Segoe UI", sans-serif}html,body{margin:0;padding:0;min-height:100%;background:var(--bg);color:var(--fg);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.page{min-height:100vh;display:flex;flex-direction:column}.shell{width:100%;max-width:1200px;margin:0 auto;padding:0 clamp(24px,6vw,64px)}.header{position:sticky;top:0;z-index:100;background:#ffffffd9;backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--border)}.header-inner{display:flex;align-items:center;justify-content:space-between;max-width:1200px;margin:0 auto;padding:14px clamp(32px,5vw,48px)}.brand{display:flex;align-items:center;gap:10px}.brand-mark{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1a1a1a,#2d2d2d);color:#fff;border-radius:var(--radius-sm)}.brand-mark--logo{background:transparent;padding:0;overflow:hidden}.brand-mark--logo img{width:100%;height:100%;object-fit:contain;display:block}.brand-name{font-size:1.125rem;font-weight:600;letter-spacing:-.02em;color:var(--fg)}.nav-links{display:flex;align-items:center;gap:8px}.nav-link{font-size:.9375rem;color:var(--fg-muted);text-decoration:none;padding:8px 14px;border-radius:var(--radius-full);transition:color .2s,background .2s}.nav-link:hover{color:var(--fg);background:var(--bg-subtle)}.header-actions{display:flex;align-items:center;gap:12px}.btn-upgrade{padding:8px 18px;font-size:.9375rem;font-weight:500;color:#fff;background:var(--accent);border:none;border-radius:var(--radius-full);cursor:pointer;transition:background .2s,transform .15s}.btn-upgrade:hover{background:var(--accent-hover);transform:scale(1.02)}.avatar{width:36px;height:36px;display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:600;color:var(--fg-muted);background:var(--bg-subtle);border-radius:50%}.dashboard{display:grid;grid-template-columns:minmax(280px,1fr) minmax(280px,1fr);gap:32px;max-width:1200px;margin:0 auto;padding:40px clamp(32px,5vw,48px) 60px;align-items:stretch}.dashboard-left{display:flex;flex-direction:column;gap:20px;min-width:0}.dashboard-title{margin:0;font-size:2rem;font-weight:700;letter-spacing:-.04em;line-height:1.15;color:var(--fg)}.dashboard-subtitle{margin:0;font-size:1rem;color:var(--fg-muted);line-height:1.5}.dropzone{border:2px dashed var(--border-strong);border-radius:var(--radius-lg);background:var(--bg-subtle);padding:32px 24px;transition:border-color .2s,background .2s;cursor:pointer}.dropzone:hover{border-color:var(--accent);background:var(--accent-soft)}.dropzone-inner{display:flex;flex-direction:column;align-items:center;gap:16px}.dropzone-icon{color:var(--fg-softer);opacity:.7}.dropzone-text{margin:0;font-size:1rem;font-weight:500;color:var(--fg-muted)}.btn-choose{display:inline-flex;align-items:center;justify-content:center;padding:10px 20px;font-size:.9375rem;font-weight:500;color:var(--fg);background:#fff;border:1px solid var(--border-strong);border-radius:var(--radius-md);cursor:pointer;transition:background .2s,border-color .2s}.btn-choose:hover{background:var(--bg-elevated);border-color:var(--fg-softer)}.btn-choose input[type=file]{position:absolute;width:0;height:0;opacity:0;overflow:hidden}.file-card{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;background:var(--accent);color:#fff;border-radius:var(--radius-md);box-shadow:var(--shadow-md)}.file-card-info{display:flex;flex-direction:column;gap:2px}.file-card-name{font-size:.9375rem;font-weight:500}.file-card-duration{font-size:.8125rem;opacity:.9}.file-card-delete{display:flex;align-items:center;justify-content:center;width:36px;height:36px;padding:0;background:#fff3;border:none;border-radius:var(--radius-sm);color:#fff;cursor:pointer;transition:background .2s}.file-card-delete:hover{background:#ffffff4d}.bulk-cta{display:flex;align-items:center;gap:12px;width:100%;padding:14px 18px;background:var(--bg-subtle);border:none;border-radius:var(--radius-md);color:var(--fg-muted);font-size:.875rem;font-family:inherit;text-align:left;cursor:pointer;transition:background .2s,color .2s}.bulk-cta:hover{background:var(--border);color:var(--fg)}.bulk-icon{color:var(--fg-softer)}.status{margin:0;font-size:.8125rem;color:var(--fg-softer)}.status-success{color:#34c759}.status-error{color:#ff3b30}.status-busy{color:var(--accent)}.status-progress{display:flex;flex-direction:column;gap:6px}.status-row{display:flex;justify-content:space-between;align-items:center;gap:8px}.status-percent{font-size:.75rem;color:var(--fg-muted)}.status-bar{height:6px;border-radius:var(--radius-full);background:var(--border);overflow:hidden}.status-bar-fill{height:100%;background:var(--accent);border-radius:inherit;transition:width .2s ease}.status-stage{font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--fg-softer)}.status code{font-size:.8em;padding:2px 6px;background:var(--bg-subtle);border-radius:4px;font-family:ui-monospace,monospace}.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:14px 28px;font-size:1rem;font-weight:600;color:#fff;background:var(--accent);border:none;border-radius:var(--radius-md);cursor:pointer;transition:background .2s,transform .15s,box-shadow .2s;box-shadow:0 4px 14px #0003}.btn-primary:hover:not(:disabled){background:var(--accent-hover);transform:translateY(-1px);box-shadow:0 6px 20px #00000040}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.dashboard-right{display:flex;flex-direction:column;gap:24px;min-width:0}.preview-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--border);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);overflow:hidden}.preview-header{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--border);background:var(--bg-elevated)}.preview-title{font-size:1rem;font-weight:600;color:var(--fg)}.preview-duration{font-size:.875rem;color:var(--fg-muted)}.preview-area{display:flex;align-items:center;justify-content:center;padding:24px 20px;background:var(--bg-subtle)}.preview-area .preview-content{align-items:stretch;max-width:100%;width:100%}.preview-plot{width:100%;max-height:320px;object-fit:contain;border-radius:var(--radius-md)}.preview-player{width:100%}.preview-audio{width:100%;height:48px}.preview-placeholder{display:flex;flex-direction:column;align-items:center;gap:12px;color:var(--fg-muted);font-size:.9375rem}.preview-placeholder svg{color:var(--fg-softer)}.preview-empty{display:flex;flex-direction:column;align-items:center;gap:12px;color:var(--fg-muted)}.preview-empty-icon{color:var(--fg-softer);opacity:.5}.preview-empty-hint{font-size:.8125rem;color:var(--fg-softer)}.preview-content{display:flex;flex-direction:column;gap:16px;width:100%}.preview-convert-hint{margin:0;font-size:.875rem;color:var(--fg-muted);text-align:center}.preview-plot-wrap{margin-top:8px}.audio-preview-container{display:flex;flex-direction:column;gap:10px;width:100%}.audio-preview-label{margin:0;font-size:.8125rem;font-weight:500;color:var(--fg-muted)}.audio-preview-bar{display:flex;align-items:center;gap:20px;padding:16px 24px;background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm),0 0 0 1px #00000005;transition:box-shadow .2s}.audio-preview-bar:hover{box-shadow:var(--shadow-md),0 0 0 1px #0000000a}.audio-preview-play{flex-shrink:0;width:48px;height:48px;display:flex;align-items:center;justify-content:center;padding:0;background:var(--fg);color:#fff;border:2px solid rgba(0,0,0,.06);border-radius:50%;cursor:pointer;transition:transform .2s,background .2s,box-shadow .2s;box-shadow:0 2px 8px #00000026}.audio-preview-play:hover:not(:disabled){background:#2c2c2e;transform:scale(1.05);box-shadow:0 4px 12px #0003}.audio-preview-play:disabled{opacity:.4;cursor:not-allowed}.audio-preview-indicators{display:flex;align-items:center;gap:8px}.audio-preview-indicator{width:28px;height:28px;display:flex;align-items:center;justify-content:center;padding:0;background:transparent;border:2px solid var(--border-strong);border-radius:50%;cursor:pointer;transition:all .2s}.audio-preview-indicator:hover:not(:disabled){border-color:var(--fg-softer)}.audio-preview-indicator:disabled{opacity:.5;cursor:default}.audio-preview-indicator.active{border-color:var(--accent);background:var(--accent-soft)}.audio-preview-indicator.midi.active{background:var(--accent);border-color:var(--accent)}.audio-preview-indicator-dot{width:6px;height:6px;border-radius:50%;background:transparent}.audio-preview-indicator.active .audio-preview-indicator-dot{background:var(--accent)}.audio-preview-indicator.midi.active .audio-preview-indicator-dot{background:#fff}.audio-preview-progress-wrap{flex:1;min-width:0;display:flex;flex-direction:column;gap:6px}.audio-preview-progress{height:4px;background:var(--border);border-radius:var(--radius-full);overflow:hidden}.audio-preview-progress-fill{height:100%;background:var(--accent);border-radius:inherit;transition:width .1s linear}.audio-preview-time{display:flex;align-items:baseline;gap:2px;font-variant-numeric:tabular-nums;font-size:.8125rem;color:var(--fg-muted)}.audio-preview-current{color:var(--fg);font-weight:500}.audio-preview-sep{opacity:.5}.audio-preview-toggle-wrap{display:flex;align-items:center;gap:12px;margin-left:auto}.audio-preview-toggle-label{font-size:.9375rem;font-weight:500;color:var(--fg-muted);transition:color .2s}.audio-preview-toggle-label.active{color:var(--accent)}.audio-preview-toggle{padding:0;background:transparent;border:none;cursor:pointer;display:flex;align-items:center;transition:opacity .2s}.audio-preview-toggle:disabled{opacity:.5;cursor:default}.audio-preview-toggle-track{display:block;width:44px;height:24px;background:var(--border-strong);border-radius:var(--radius-full);position:relative;transition:background .2s}.audio-preview-toggle.on .audio-preview-toggle-track{background:var(--accent)}.audio-preview-toggle-thumb{position:absolute;top:2px;left:2px;width:20px;height:20px;background:#fff;border-radius:50%;box-shadow:0 2px 6px #0003;transition:transform .2s ease-out}.audio-preview-toggle.on .audio-preview-toggle-thumb{transform:translate(20px)}.quick-actions{display:flex;gap:10px;margin-top:12px}.btn-quick-action{display:inline-flex;align-items:center;gap:8px;padding:10px 16px;font-size:.875rem;font-weight:500;font-family:inherit;color:var(--fg);background:#fff;border:1px solid var(--border-strong);border-radius:var(--radius-md);cursor:pointer;text-decoration:none;transition:all .2s}.btn-quick-action:hover{background:var(--bg-subtle);border-color:var(--fg-softer);transform:translateY(-1px)}.btn-quick-action svg{flex-shrink:0}.btn-quick-download{background:var(--accent);color:#fff;border-color:var(--accent)}.btn-quick-download:hover{background:var(--accent-hover);border-color:var(--accent-hover)}.inline-sheet-music{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;margin-top:16px}.inline-sheet-music-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:var(--bg-elevated);border-bottom:1px solid var(--border)}.inline-sheet-music-title{font-size:.875rem;font-weight:600;color:var(--fg)}.btn-expand-sheet{display:flex;align-items:center;justify-content:center;width:32px;height:32px;padding:0;background:transparent;border:1px solid var(--border-strong);border-radius:var(--radius-sm);color:var(--fg-muted);cursor:pointer;transition:all .2s}.btn-expand-sheet:hover{background:var(--bg-subtle);border-color:var(--fg-softer);color:var(--fg)}.inline-sheet-music-content{padding:16px;max-height:300px;overflow:auto;background:#fff}.inline-sheet-music-content .sheet-music-viewer{width:100%}.controls-card{padding:24px;background:var(--accent-soft);border-top:1px solid var(--border)}.toggle-group{display:flex;gap:0;margin-bottom:24px}.toggle-option{display:flex;align-items:center;gap:10px;flex:1;padding:12px 18px;font-size:.9375rem;font-weight:500;color:var(--fg-muted);background:transparent;border:1px solid var(--border);border-radius:0;cursor:pointer;transition:all .2s}.toggle-option:first-of-type{border-radius:var(--radius-sm) 0 0 var(--radius-sm);border-right:none}.toggle-option:last-of-type{border-radius:0 var(--radius-sm) var(--radius-sm) 0}.toggle-option:hover{color:var(--fg)}.toggle-option.active{color:var(--fg);background:#fff;border-color:var(--border-strong);box-shadow:var(--shadow-sm)}.toggle-option.active .toggle-dot{background:var(--accent)}.toggle-dot{width:10px;height:10px;border-radius:50%;background:var(--fg-softer);transition:background .2s}.slider-group{margin-bottom:20px}.slider-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.slider-label{font-size:.875rem;font-weight:500;color:var(--fg);display:flex;align-items:center;gap:6px}.slider-info{font-size:.75rem;color:var(--fg-softer);cursor:help}.slider-value{font-size:.875rem;font-weight:600;color:var(--fg-muted)}.slider-track{position:relative;height:24px;display:flex;align-items:center}.slider-track:before{content:"";position:absolute;left:0;right:0;height:8px;background:#00000014;border-radius:var(--radius-full)}.slider-track-gradient:before{background:var(--accent-gradient);opacity:.8}.slider-input{position:relative;width:100%;height:24px;margin:0;-webkit-appearance:none;appearance:none;background:transparent;cursor:pointer}.slider-input::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:#fff;border:2px solid var(--border-strong);box-shadow:var(--shadow-md);cursor:pointer;transition:transform .15s}.slider-input::-webkit-slider-thumb:hover{transform:scale(1.1)}.slider-input::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:#fff;border:2px solid var(--border-strong);box-shadow:var(--shadow-md);cursor:pointer}.slider-labels{display:flex;justify-content:space-between;margin-top:6px;font-size:.6875rem;color:var(--fg-softer);text-transform:uppercase;letter-spacing:.05em}.upgrade-hint{margin:16px 0 12px;font-size:.8125rem;color:var(--fg-muted)}.btn-trial{display:inline-flex;align-items:center;justify-content:center;gap:8px;width:100%;padding:14px 24px;font-size:1rem;font-weight:600;color:#fff;background:var(--accent);border:none;border-radius:var(--radius-md);cursor:pointer;transition:background .2s,transform .15s}.btn-trial:hover{background:var(--accent-hover);transform:translateY(-1px)}.result-actions{display:flex;gap:12px;padding:20px 24px;border-top:1px solid var(--border)}.btn-download{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;font-size:.9375rem;font-weight:600;color:#fff;background:var(--accent);border-radius:var(--radius-md);text-decoration:none;transition:background .2s,transform .15s}.btn-download:hover{background:var(--accent-hover);transform:translateY(-1px)}.btn-download.secondary{background:var(--bg-subtle);color:var(--fg);border:1px solid var(--border-strong)}.btn-download.secondary:hover{background:var(--border)}.btn-sheet-view{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;font-size:.9375rem;font-weight:600;color:var(--fg);background:var(--bg-subtle);border:1px solid var(--border-strong);border-radius:var(--radius-md);cursor:pointer;font-family:inherit;transition:background .2s,border-color .2s,transform .15s}.btn-sheet-view:hover{background:var(--border);border-color:var(--border-strong);transform:translateY(-1px)}.sheet-view-overlay{position:fixed;inset:0;z-index:1001;display:flex;align-items:stretch;justify-content:center;background:#00000080;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);animation:fadeIn .2s ease-out}.sheet-view-dialog{position:relative;width:100%;max-width:1200px;margin:24px;display:flex;flex-direction:column;background:var(--bg);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg),0 24px 80px #0003;overflow:hidden;max-height:calc(100vh - 48px)}.sheet-view-header{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 24px;border-bottom:1px solid var(--border);background:var(--bg)}.sheet-view-title{margin:0;font-size:1.25rem;font-weight:700;color:var(--fg)}.sheet-view-close{flex-shrink:0;width:40px;height:40px;display:flex;align-items:center;justify-content:center;padding:0;background:transparent;border:none;border-radius:var(--radius-sm);color:var(--fg-muted);cursor:pointer;transition:background .2s,color .2s}.sheet-view-close:hover{background:var(--bg-subtle);color:var(--fg)}.sheet-view-body{flex:1;overflow:auto;padding:24px;min-height:0}.sheet-view-score{min-height:400px}.sheet-view-score .sheet-music-viewer{width:100%}.sheet-view-score .sheet-music-canvas{width:100%;min-height:400px}.sheet-view-audio-bar{flex-shrink:0;display:flex;align-items:center;gap:16px;padding:16px 24px;border-top:1px solid var(--border);background:var(--bg-subtle)}.sheet-view-audio-mode{display:flex;align-items:center;gap:6px;padding:6px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-full)}.sheet-view-audio-mode-btn{padding:6px 12px;border-radius:var(--radius-full);border:none;background:transparent;color:var(--fg-muted);font-size:.8125rem;font-weight:600;cursor:pointer}.sheet-view-audio-mode-btn.active{background:var(--accent);color:#fff}.sheet-view-audio-mode-btn:disabled{opacity:.5;cursor:not-allowed}.sheet-view-play{flex-shrink:0;width:48px;height:48px;display:flex;align-items:center;justify-content:center;padding:0;background:var(--accent);color:#fff;border:none;border-radius:50%;cursor:pointer;transition:background .2s,transform .15s}.sheet-view-play:hover{background:var(--accent-hover);transform:scale(1.05)}.sheet-view-audio-progress-wrap{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}.sheet-view-audio-progress{height:6px;background:var(--border);border-radius:3px;overflow:hidden}.sheet-view-audio-progress-fill{height:100%;background:var(--accent);border-radius:3px;transition:width .1s linear}.sheet-view-audio-time{font-size:.8125rem;color:var(--fg-muted)}.sheet-view-audio-sep{margin:0 4px;opacity:.7}.sheet-view-audio-label{flex-shrink:0;font-size:.8125rem;font-weight:600;color:var(--fg-muted)}.section{padding:64px 0;background:var(--bg)}.section-light{background:var(--bg-subtle)}.section-title{margin:0 0 32px;font-size:1.75rem;font-weight:700;letter-spacing:-.03em;color:var(--fg)}.cards-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.faq-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.info-card{padding:28px;background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:box-shadow .2s,transform .2s}.info-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.info-card h3{margin:0 0 12px;font-size:1.125rem;font-weight:600;color:var(--fg)}.info-card p{margin:0;font-size:.9375rem;color:var(--fg-muted);line-height:1.6}.footer{margin-top:auto;padding:24px 0;border-top:1px solid var(--border);background:var(--bg-subtle)}.footer-text{font-size:.875rem;color:var(--fg-muted)}.footer-text a{color:var(--accent);text-decoration:none}.footer-text a:hover{text-decoration:underline}.upgrade-modal-overlay{position:fixed;inset:0;z-index:1000;display:flex;align-items:center;justify-content:center;padding:24px;background:#0006;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);animation:fadeIn .2s ease-out}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.upgrade-modal{position:relative;width:100%;max-width:560px;max-height:90vh;overflow-y:auto;background:#fff;border-radius:var(--radius-xl);box-shadow:var(--shadow-lg),0 24px 80px #00000026;padding:32px 28px 28px}.upgrade-modal-close{position:absolute;top:20px;right:20px;width:36px;height:36px;display:flex;align-items:center;justify-content:center;padding:0;background:transparent;border:none;border-radius:var(--radius-sm);color:var(--fg-muted);cursor:pointer;transition:background .2s,color .2s}.upgrade-modal-close:hover{background:var(--bg-subtle);color:var(--fg)}.upgrade-modal-title{margin:0 36px 0 0;font-size:1.5rem;font-weight:700;letter-spacing:-.03em;line-height:1.3;color:var(--fg)}.upgrade-modal-crown-wrap{display:inline-flex;align-items:center;gap:4px;color:var(--accent)}.upgrade-modal-crown-wrap svg{flex-shrink:0}.upgrade-modal-wide{max-width:680px}.upgrade-modal-subtitle{margin:8px 0 0;font-size:1rem;color:var(--fg-muted)}.upgrade-modal-plans{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:28px 0 24px}.upgrade-modal-plan{position:relative;padding:24px 20px;background:var(--bg-subtle);border:1px solid var(--border);border-radius:var(--radius-lg);transition:border-color .2s,box-shadow .2s}.upgrade-modal-plan:hover{border-color:var(--border-strong)}.upgrade-modal-plan-featured{background:var(--accent-soft);border-color:var(--accent)}.upgrade-modal-plan-badge{position:absolute;top:-10px;left:50%;transform:translate(-50%);padding:4px 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