:root{--primary-color: #2563eb;--secondary-color: #7e22ce;--accent-color: #0ea5e9;--background-color: #f8fafc;--surface-color: #ffffff;--border-color: #e2e8f0;--text-color: #1e293b;--text-muted: #64748b;--success-color: #10b981;--danger-color: #ef4444;--warning-color: #f59e0b;--font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px rgba(0, 0, 0, .1)}html,body{height:100%;width:100%;overflow-x:hidden}body{font-family:var(--font-family);line-height:1.6;color:var(--text-color);background-color:var(--background-color);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:var(--primary-color);text-decoration:none;transition:color .2s}a:hover{color:#1d4ed8;text-decoration:underline}h1,h2,h3,h4,h5,h6{margin-bottom:.5rem;font-weight:600;line-height:1.2}h1{font-size:2rem}h2{font-size:1.75rem}h3{font-size:1.5rem}button,input,select,textarea{font-family:inherit;font-size:inherit;line-height:inherit}button{cursor:pointer;border:none;background:none}input,select,textarea{outline:none}img{max-width:100%;height:auto}@media (prefers-color-scheme: dark){:root{--background-color: #0f172a;--surface-color: #1e293b;--border-color: #334155;--text-color: #e2e8f0;--text-muted: #94a3b8}}:root{--primary-color: #2563eb;--secondary-color: #7e22ce;--accent-color: #0ea5e9;--background-color: #f8fafc;--surface-color: #ffffff;--border-color: #e2e8f0;--text-color: #1e293b;--text-muted: #64748b;--success-color: #10b981;--danger-color: #ef4444;--warning-color: #f59e0b;--grid-line-color: #cbd5e1;--grid-line-major: #94a3b8;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px rgba(0, 0, 0, .1);--font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);color:var(--text-color);background-color:var(--background-color);line-height:1.5}button,select,input{font-family:inherit}.music-analyzer-app{display:flex;flex-direction:column;min-height:100vh;max-width:100%}.text-muted{color:var(--text-muted)}.text-center{text-align:center}.text-right{text-align:right}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 1rem}@keyframes pulse{0%{box-shadow:0 0 #2563ebb3}70%{box-shadow:0 0 0 10px #2563eb00}to{box-shadow:0 0 #2563eb00}}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#f1f1f1;border-radius:4px}::-webkit-scrollbar-thumb{background:#bec3c9;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#a0a0a0}@media (max-width: 768px){.music-analyzer-app{font-size:14px}}@media (prefers-color-scheme: dark){:root{--background-color: #0f172a;--surface-color: #1e293b;--border-color: #334155;--text-color: #e2e8f0;--text-muted: #94a3b8;--grid-line-color: #334155;--grid-line-major: #475569}}.header{display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;background-color:var(--surface-color);border-bottom:1px solid var(--border-color);box-shadow:var(--shadow-sm);position:sticky;top:0;z-index:10}.header-title{display:flex;align-items:center}.arrangement-title{font-size:1.5rem;font-weight:600;margin:0;cursor:pointer;padding:.25rem .5rem;border-radius:4px;transition:background-color .2s}.arrangement-title:hover{background-color:#0000000d}.title-input{font-size:1.5rem;font-weight:600;padding:.25rem .5rem;border:1px solid var(--primary-color);border-radius:4px;outline:none;background-color:var(--surface-color);color:var(--text-color)}.header-actions{display:flex;gap:.75rem}.header-button{padding:.5rem 1rem;border-radius:4px;font-weight:500;cursor:pointer;transition:all 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