:root{--bg-primary: #0d0d1a;--bg-secondary: #151528;--bg-card: #1a1a2e;--bg-input: #252540;--border: #2a2a4a;--text-primary: #e0e0f0;--text-secondary: #8888aa;--accent: #6366f1;--accent-hover: #818cf8;--accent-glow: rgba(99, 102, 241, .3);--success: #22c55e;--warning: #f59e0b;--error: #ef4444}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Inter,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;-webkit-font-smoothing:antialiased}.app{max-width:1200px;margin:0 auto;padding:24px}.app-header{text-align:center;margin-bottom:32px}.app-header h1{font-size:28px;font-weight:700;letter-spacing:-.5px;background:linear-gradient(135deg,#818cf8,#c084fc);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.subtitle{color:var(--text-secondary);font-size:14px;margin-top:4px}.controls{background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;padding:20px 24px;margin-bottom:24px}.controls-row{display:flex;gap:16px;align-items:flex-end;flex-wrap:wrap}.controls-row label{display:flex;flex-direction:column;gap:6px;flex:1;min-width:100px}.controls-row label span{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text-secondary)}.controls-row select,.controls-row input[type=number]{background:var(--bg-input);border:1px solid var(--border);border-radius:8px;color:var(--text-primary);padding:8px 12px;font-size:14px;outline:none;transition:border-color .2s;-moz-appearance:none;appearance:none;-webkit-appearance:none}.controls-row select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238888aa' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;padding-right:28px}.controls-row select:focus,.controls-row input[type=number]:focus{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-glow)}.controls-row input[type=number]{width:80px;-moz-appearance:textfield}.controls-row input[type=number]::-webkit-inner-spin-button,.controls-row input[type=number]::-webkit-outer-spin-button{-webkit-appearance:none}.generate-btn{display:block;width:100%;margin-top:16px;padding:12px 24px;background:var(--accent);color:#fff;border:none;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;transition:background .2s,transform .1s}.generate-btn:hover:not(:disabled){background:var(--accent-hover)}.generate-btn:active:not(:disabled){transform:scale(.99)}.generate-btn:disabled{opacity:.6;cursor:not-allowed}.melodies-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(520px,1fr));gap:16px}.melody-card{background:var(--bg-card);border:1px solid var(--border);border-radius:10px;overflow:hidden;transition:border-color .2s,box-shadow .2s}.melody-card:hover{border-color:var(--accent);box-shadow:0 0 12px var(--accent-glow)}.melody-card.playing{border-color:var(--success);box-shadow:0 0 12px #22c55e4d}.card-header{display:flex;align-items:center;padding:10px 14px;gap:10px;border-bottom:1px solid var(--border)}.card-number{font-weight:700;font-size:14px;color:var(--accent);min-width:28px}.card-info{font-size:12px;color:var(--text-secondary);flex:1}.card-actions{display:flex;gap:6px}.btn-play,.btn-action{background:var(--bg-input);border:1px solid var(--border);border-radius:6px;color:var(--text-primary);width:32px;height:32px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:14px;transition:background .15s,border-color .15s}.btn-play:hover,.btn-action:hover{background:var(--border);border-color:var(--accent)}.btn-play.active,.btn-action.btn-success{background:var(--success);border-color:var(--success);color:#fff}.piano-roll-container{overflow-x:auto;overflow-y:hidden;padding:0}.piano-roll{display:block;width:100%;height:auto;image-rendering:pixelated}.card-footer{padding:6px 14px;border-top:1px solid var(--border)}.feedback-row{display:flex;align-items:center;justify-content:space-between;gap:8px}.feedback-row .ai-explanation,.feedback-row .drag-hint{flex:1;min-width:0}.feedback-buttons{display:flex;gap:4px;flex-shrink:0}.btn-feedback{background:var(--bg-input);border:1px solid var(--border);border-radius:6px;width:28px;height:28px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:12px;color:var(--text-secondary);transition:all .15s;opacity:.5}.btn-feedback:hover:not(:disabled){opacity:1;border-color:var(--accent)}.btn-feedback:disabled{cursor:default}.btn-feedback.btn-liked{background:#22c55e33;border-color:var(--success);color:var(--success);opacity:1}.btn-feedback.btn-disliked{background:#ef444433;border-color:var(--error);color:var(--error);opacity:1}.drag-hint{font-size:11px;color:var(--text-secondary);opacity:.6}.midi-upload{background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;padding:16px 24px;margin-bottom:24px}.upload-header{margin-bottom:10px}.upload-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text-secondary)}.upload-area{display:flex;flex-direction:column;align-items:center;gap:6px;padding:20px;border:2px dashed var(--border);border-radius:8px;cursor:pointer;transition:border-color .2s,background .2s}.upload-area:hover{border-color:var(--accent);background:#6366f10d}.upload-icon{font-size:24px;color:var(--text-secondary);line-height:1}.upload-text{font-size:13px;color:var(--text-primary)}.upload-hint{font-size:11px;color:var(--text-secondary)}.progression-info{background:var(--bg-input);border:1px solid var(--border);border-radius:8px;padding:12px 14px}.progression-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.progression-filename{font-size:13px;font-weight:600;color:var(--accent)}.btn-remove{background:none;border:1px solid var(--border);border-radius:4px;color:var(--text-secondary);width:24px;height:24px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:12px;transition:color .15s,border-color .15s}.btn-remove:hover{color:var(--error);border-color:var(--error)}.progression-chords{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}.chord-badge{background:var(--bg-card);border:1px solid var(--border);border-radius:4px;padding:2px 8px;font-size:12px;color:var(--text-primary)}.chord-badge small{color:var(--text-secondary);font-size:10px;margin-left:2px}.progression-meta{font-size:11px;color:var(--text-secondary)}.loading-overlay{background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;padding:32px 24px;margin-bottom:24px}.loading-progress{max-width:480px;margin:0 auto}.loading-bar{height:4px;background:var(--bg-input);border-radius:2px;overflow:hidden;margin-bottom:24px}.loading-bar-fill{height:100%;background:linear-gradient(90deg,var(--accent),#c084fc);border-radius:2px;transition:width .6s ease;position:relative}.loading-bar-fill:after{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(90deg,transparent 0%,rgba(255,255,255,.3) 50%,transparent 100%);animation:shimmer 1.5s infinite}@keyframes shimmer{0%{transform:translate(-100%)}to{transform:translate(100%)}}.loading-stages{display:flex;flex-direction:column;gap:12px}.loading-step{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--text-secondary);opacity:.4;transition:all .3s}.loading-step.active{color:var(--text-primary);opacity:1}.loading-step.done{color:var(--success);opacity:.7}.step-icon{width:20px;height:20px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;flex-shrink:0;border:2px solid var(--border);transition:all .3s}.loading-step.active .step-icon{border-color:var(--accent);background:var(--accent);animation:pulse-dot 1.2s ease infinite}.loading-step.done .step-icon{border-color:var(--success);background:var(--success);color:#fff;animation:none}@keyframes pulse-dot{0%,to{box-shadow:0 0 0 0 var(--accent-glow)}50%{box-shadow:0 0 0 6px transparent}}.error-message{background:#ef44441a;border:1px solid var(--error);border-radius:8px;padding:14px 18px;margin-bottom:24px;color:var(--error);font-size:13px;white-space:pre-wrap}.empty-state{text-align:center;padding:60px 20px;color:var(--text-secondary);font-size:15px}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}