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:root{--color-bg:#000;--color-surface:#080808;--color-elevated:#121212;--color-border:#1f1f1f;--color-border-light:#333;--color-text-primary:#fff;--color-text-secondary:#b0b0b0;--color-text-tertiary:#6a6a6a;--spacing-xs:.25rem;--spacing-sm:.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2.5rem;--transition-fast:.12s cubic-bezier(.4,0,.2,1);--transition-normal:.25s cubic-bezier(.4,0,.2,1);--transition-slow:.4s cubic-bezier(.4,0,.2,1)}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--color-bg);color:var(--color-text-primary);-webkit-font-smoothing:antialiased;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;overflow:hidden}.app-container{flex-direction:column;height:100vh;display:flex;position:relative}.app-header{padding:var(--spacing-md)var(--spacing-xl);text-align:center;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);z-index:10;background:linear-gradient(#080808f2 0%,#000000b3 100%);border-bottom:1px solid 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#ffffff0f;border-radius:12px;flex-direction:column;gap:6px;margin-left:auto;padding:12px 18px;display:flex}.info-label{color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:1.2px;font-size:10px;font-weight:800}.shortcuts{color:var(--color-text-tertiary);gap:14px;font-size:11px;font-weight:600;display:flex}.shortcut{align-items:center;gap:4px;display:flex}@media (max-width:768px){.piano-keyboard{height:150px}.white-key{width:42px;height:150px}.black-key{width:28px;height:100px;margin:0 -14px}.controls-panel{flex-direction:column;align-items:stretch}.keyboard-info{margin-left:0}.app-title{letter-spacing:3px;font-size:22px}}