/* ============================================================
   Ripple Tank - layout

   The tank is the hero. Under it: tools, presets, the
   frequency slider, then Pause / Calm / Clear.
   ============================================================ */

.rt-stage {
  cursor: crosshair;
  height: clamp(300px, min(62svh, 112vw), 760px);
}
.rt-stage:focus-visible { outline-offset: -3px; }

.rt-controls {
  display: grid;
  gap: .9rem;
  width: 100%;
  max-width: 860px;
  margin-inline: auto;
  padding: 1rem clamp(1rem, 4vw, 1.25rem) 0;
}

.rt-group { display: grid; gap: .35rem; min-width: 0; }
.rt-label {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* ---- tools: one segmented row ----------------------------- */
.rt-seg { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .4rem; }
.rt-seg .btn,
.rt-presets .btn,
.rt-row .btn { min-height: var(--tap); padding-inline: .4rem; min-width: 0; }
.rt-seg .btn[aria-pressed="true"] {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--text);
}
.rt-key {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--text-faint);
  border: 1px solid var(--line-bright);
  border-radius: 4px;
  padding: 0 .3rem;
  line-height: 1.4;
}

/* ---- presets: 2 x 2 on a phone, 4 across when wide -------- */
.rt-presets { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .4rem; }
.rt-presets .btn { font-size: .88rem; }
.rt-presets .btn[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }

/* ---- slider ----------------------------------------------- */
.rt-slider {
  display: grid;
  gap: .05rem;
  font-size: .9rem;
  color: var(--text-dim);
  min-width: 0;
}
.rt-slider span { display: flex; justify-content: space-between; gap: .5rem; }
.rt-slider output { font-family: var(--font-mono); color: var(--text); }
.rt-slider input {
  width: 100%;
  height: var(--tap);
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ---- playback --------------------------------------------- */
.rt-row { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: .5rem; }

.rt-try {
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: .7rem .9rem;
  color: #C9CEE2;
}

@media (min-width: 640px) {
  .rt-presets { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}