*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg-deep: #060608;--bg-stage: #0c0c10;--piano-body: #121218;--piano-body-light: #1a1a22;--piano-edge: #2a2a34;--text-primary: #f0f0f5;--text-muted: #888894;--accent-avocado: #a8e06f;--accent-avocado-glow: rgba(168, 224, 111, .55);--accent-avocado-deep: #6b9e3a;--accent-avocado-soft: rgba(168, 224, 111, .18);--white-key-top: #faf8f2;--white-key-mid: #ece8df;--white-key-edge: #c8c2b4;--black-key-top: #2a2a30;--black-key-mid: #141418;--black-key-edge: #08080a;--record-red: #ff3b4a;--font-sans: "Inter", system-ui, -apple-system, sans-serif;--font-mono: "JetBrains Mono", 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var(--accent-avocado-soft)}.start-btn__ring{position:absolute;top:-4px;right:-4px;bottom:-4px;left:-4px;border-radius:14px;border:1px solid rgba(168,224,111,.3);animation:ring-pulse 2s ease infinite}@keyframes ring-pulse{0%,to{opacity:.5;transform:scale(1)}50%{opacity:0;transform:scale(1.05)}}@media (max-width: 768px){.control-panel,.control-panel__controls{flex-direction:column;align-items:stretch}.control-group{min-width:100%}.chord-display__row{flex-direction:column;align-items:stretch;gap:.5rem;height:auto}.chord-display__main{flex:none}.piano-header{min-height:108px;padding:.5rem 1rem}}