:root{--blue:#1565c0;--green:#4caf50;--red:#f44336;--ink:#2c3e50;--bg:#f2f4f8}*{box-sizing:border-box}body{margin:0;padding:20px 10px;background:var(--bg);font-family:'Segoe UI',Roboto,Arial,sans-serif;text-align:center;color:#333}main{max-width:780px;margin:auto}h1{color:var(--blue);font-size:2.2rem}h1:before{content:'♫ ';color:var(--green)}h2,h3{color:var(--ink)}.section{background:#fff;border-radius:12px;padding:18px;box-shadow:0 2px 8px #0002}.screen{display:none}.screen.show{display:block}button{border:0;border-radius:7px;background:var(--green);color:#fff;padding:12px 22px;margin:6px;font-size:17px;font-weight:650;cursor:pointer}button.red{background:var(--red)}button.gray{background:#607d8b}button.blue{background:#2196f3}button:disabled{opacity:.5}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:16px 0}.card{border:2px solid var(--green);background:#e8f5e9;border-radius:10px;padding:14px;cursor:pointer}.card.selected{border-color:#2196f3;background:#e3f2fd}.card strong{display:block;font-size:18px}.card.wide{grid-column:1/-1}.key-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:12px auto 20px}.key-grid button{margin:0;background:#e8f5e9;color:var(--ink);border:2px solid var(--green);padding:10px}.key-grid button.selected{background:#2196f3;color:#fff;border-color:#1565c0}.topbar,.hud{display:flex;justify-content:space-between;align-items:center;gap:10px}.pill{padding:7px 11px;background:#eef2f6;border-radius:999px;font-weight:700;white-space:nowrap}.progress{height:11px;background:#e5e7eb;flex:1;border-radius:99px;overflow:hidden}.progress span{display:block;height:100%;background:var(--green);width:0}.staff{margin:20px auto;max-width:720px;min-height:180px;padding:8px;background:linear-gradient(145deg,#f8fbff,#eef6ff);border:2px solid #d9e9f8;border-radius:16px;box-shadow:inset 0 1px 0 #fff,0 5px 16px #1565c012}.staff svg{display:block;width:100%;height:auto;overflow:visible}.keyboard{display:flex;justify-content:center;flex-wrap:wrap;gap:7px;margin:14px}.keyboard button{min-width:58px;margin:0}.sequence{min-height:52px;display:flex;gap:8px;justify-content:center;flex-wrap:wrap}.chip{padding:8px 11px;background:#e3f2fd;border:2px solid #2196f3;border-radius:9px;font-weight:800}.feedback{min-height:52px;font-size:19px;font-weight:700;padding:10px}.ok{color:#25823a}.no{color:#d32f2f}.hidden{display:none!important}.result{font-size:54px;font-weight:800;color:var(--blue)}.mini{color:#667085}@media(max-width:560px){body{padding:8px}.grid{grid-template-columns:1fr}h1{font-size:1.7rem}.section{padding:12px}.card.wide{grid-column:auto}.key-grid{grid-template-columns:repeat(2,1fr)}.hud{flex-wrap:wrap}.progress{flex-basis:55%;order:3}.keyboard button{min-width:46px;padding:11px}.staff{min-height:130px;padding:4px}}