/* ============================================================
   k-Means Clustering - layout

   The dot field is the hero. Under it: Step / Play / New start /
   Clear, what just happened, k, dot sets, the elbow chart.
   ============================================================ */

.km-stage {
  cursor: crosshair;
  height: clamp(300px, min(60svh, 115vw), 720px);
}
.km-stage:focus-visible { outline-offset: -3px; }

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

.km-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .4rem; }
.km-row .btn,
.km-presets .btn { min-height: var(--tap); padding-inline: .3rem; min-width: 0; font-size: .9rem; }
.km-presets .btn[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }

.km-status { margin: -.2rem 0 0; font-size: .9rem; color: var(--text-dim); min-height: 1.4em; }
.km-hint { margin: .2rem 0 0; font-size: .85rem; color: var(--text-dim); }

.km-group { display: grid; gap: .35rem; min-width: 0; }
.km-label {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.km-presets { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .4rem; }

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

.km-elbow {
  position: relative;
  height: 170px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg-2);
  overflow: hidden;
}
.km-elbow canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

.km-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) {
  .km-presets { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}