/* rhythm trainer */
#rhythm-trainer .rt-notation { margin-top: 12px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 6px 4px; }
#rhythm-trainer .rt-svg { display: block; width: 100%; max-width: 720px; margin: 0 auto; height: auto; }
#rhythm-trainer .rt-staff, #rhythm-trainer .rt-bar { stroke: var(--ink); stroke-width: 1.2; }
#rhythm-trainer .rt-ts { fill: var(--ink); font: 700 20px var(--serif, serif); text-anchor: middle; }
#rhythm-trainer .rt-beat { fill: var(--muted); font: 500 9px var(--sans); text-anchor: middle; }
#rhythm-trainer .rt-head { fill: var(--ink); stroke: var(--ink); stroke-width: 1.2; }
#rhythm-trainer .rt-head.rt-hollow { fill: var(--card); stroke-width: 1.8; }
#rhythm-trainer .rt-stem { stroke: var(--ink); stroke-width: 1.2; }
#rhythm-trainer .rt-dot, #rhythm-trainer .rt-beam, #rhythm-trainer .rt-rest-h, #rhythm-trainer .rt-rest-e circle { fill: var(--ink); }
#rhythm-trainer .rt-flag, #rhythm-trainer .rt-rest, #rhythm-trainer .rt-rest-e path, #rhythm-trainer .rt-tb { stroke: var(--ink); stroke-width: 1.6; fill: none; }
#rhythm-trainer .rt-3 { fill: var(--ink); font: italic 600 9px var(--sans); text-anchor: middle; }
#rhythm-trainer .rt-dev { font: 600 8.5px var(--sans); text-anchor: middle; fill: var(--muted); }
#rhythm-trainer .rt-ontime .rt-head { fill: var(--ok); stroke: var(--ok); } #rhythm-trainer .rt-ontime .rt-dev { fill: var(--ok); }
#rhythm-trainer .rt-early .rt-head, #rhythm-trainer .rt-late .rt-head { fill: var(--warn); stroke: var(--warn); }
#rhythm-trainer .rt-early .rt-dev, #rhythm-trainer .rt-late .rt-dev { fill: var(--warn); }
#rhythm-trainer .rt-miss .rt-head { fill: var(--bad); stroke: var(--bad); } #rhythm-trainer .rt-miss .rt-dev { fill: var(--bad); }
#rhythm-trainer .rt-head-line { stroke: var(--ok); stroke-width: 1.5; }
#rhythm-trainer .rt-actions { margin-top: 12px; }
#rhythm-trainer .rt-pad { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; width: 100%; min-height: 120px; margin-top: 12px;
  border-radius: 20px; border: 2px dashed var(--line-strong); background: var(--strong); color: var(--ink); font: 600 20px var(--sans); cursor: pointer; touch-action: manipulation; user-select: none; -webkit-user-select: none; }
#rhythm-trainer .rt-pad small { font: 400 13px var(--sans); color: var(--muted); }
#rhythm-trainer .rt-pad.rt-armed { border-style: solid; border-color: var(--ink); }
#rhythm-trainer .rt-pad.rt-flash { animation: rt-flash .15s ease-out; }
@keyframes rt-flash { from { background: var(--family); } to { background: var(--strong); } }
#rhythm-trainer .rt-result { margin-top: 12px; }
#rhythm-trainer .rt-detail { margin-top: 6px; }
#rhythm-trainer .rt-settings { margin-top: 12px; }
#rhythm-trainer .rt-tempo { gap: 6px; }
#rhythm-trainer .rt-bpm { width: 64px; min-height: 36px; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--card); color: var(--ink); font: inherit; padding: 4px 6px; }
#rhythm-trainer .rt-keys { margin: 10px 0 0; }
@media (max-width: 560px) {
  #rhythm-trainer .rt-actions .btn.big { padding: 12px 18px; }
  #rhythm-trainer .rt-pad { min-height: 104px; }
}
#rhythm-trainer [data-level] { max-width: 220px; }
#rhythm-trainer .rt-note .rt-head.rt-hollow { fill: var(--card); stroke-width: 1.8; }