.grit-rhythm {
  --gr-bg: #10121a;
  --gr-line: #3b4256;
  --gr-text: #e8eaf0;
  --gr-dim: #9aa2b8;
  --gr-accent: #6ea8fe;
  margin: 2em 0;
  padding: 14px;
  border-radius: 10px;
  background: var(--gr-bg);
  color: var(--gr-text);
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN", sans-serif;
  line-height: 1.6;
}

.grit-rhythm * { box-sizing: border-box; }

.gr-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  margin-bottom: 10px;
}
.gr-title { font-weight: 700; font-size: 15px; margin: 0; }
.gr-note { color: var(--gr-dim); font-size: 12px; margin: 0; }

.gr-stage { position: relative; width: 100%; }
.gr-canvas {
  display: block;
  width: 100%;
  border-radius: 8px;
  background: #0a0c12;
  touch-action: none;
}
.gr-zones {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  touch-action: none;
}
.gr-zone { -webkit-tap-highlight-color: transparent; }

.gr-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px;
  text-align: center;
  background: rgba(10, 12, 18, .88);
  border-radius: 8px;
}
.gr-overlay[hidden] { display: none !important; }
.gr-overlay h4 { margin: 0; font-size: 17px; }
.gr-overlay p { margin: 0; color: var(--gr-dim); font-size: 13px; }

.gr-btn {
  appearance: none;
  border: 1px solid var(--gr-accent);
  background: var(--gr-accent);
  color: #0a0c12;
  font: inherit;
  font-weight: 700;
  padding: 10px 22px;
  border-radius: 999px;
  cursor: pointer;
}
.gr-btn.gr-sub { background: transparent; color: var(--gr-accent); font-weight: 500; }
.gr-btn:disabled { opacity: .5; cursor: default; }

.gr-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 16px;
  margin-top: 10px;
  font-size: 12px;
  color: var(--gr-dim);
}
.gr-controls label { display: flex; align-items: center; gap: 6px; }
.gr-controls input[type=range] { width: 120px; }
.gr-val { color: var(--gr-text); font-variant-numeric: tabular-nums; }

.gr-result { font-size: 14px; }
.gr-result table { border-collapse: collapse; margin: 6px auto 0; font-size: 13px; }
.gr-result td { padding: 2px 10px; }
.gr-result td:first-child { color: var(--gr-dim); text-align: right; }
.gr-result td:last-child { text-align: left; font-variant-numeric: tabular-nums; }

.gr-rec { margin-top: 10px; }
.gr-rec textarea {
  width: 100%;
  height: 90px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 11px;
  background: #0a0c12;
  color: var(--gr-text);
  border: 1px solid var(--gr-line);
  border-radius: 6px;
  padding: 6px;
}

@media (max-width: 600px) {
  .grit-rhythm { padding: 10px; }
  .gr-controls input[type=range] { width: 96px; }
}

/* 演奏中だけ出る中断ボタン。見出しの右端に寄せる */
.gr-stop {
  margin-left: auto;
  padding: 6px 16px;
  font-size: 12px;
}

/* 一覧ページに出す、曲ページへの導線 */
.grit-rhythm-link { margin: 1.2em 0; }
.grit-rhythm-link a {
  display: inline-block;
  padding: 9px 20px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}