/* ============================================================
   Boids Flocking - layout

   The sky is the hero, full width. Under it: buttons, the
   "one bird's view" toggle, then the sliders in a grid
   (1 column on a phone, 2 or 3 on wider screens).

   Force colours: separation = hot pink, alignment = amber,
   cohesion = green. The sliders wear the same colours.
   ============================================================ */

.bd-stage {
  cursor: crosshair;
  height: clamp(320px, min(64svh, 120vw), 720px);
}
.bd-stage:focus-visible { outline-offset: -3px; }

.bd-controls {
  display: grid;
  gap: .85rem;
  width: 100%;
  max-width: 860px;
  margin-inline: auto;
  padding: 1rem clamp(1rem, 4vw, 1.25rem) 0;
}

/* ---- buttons ---------------------------------------------- */
.bd-row { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: .5rem; }
.bd-row .btn { min-height: var(--tap); padding-inline: .4rem; min-width: 0; }
.bd-row-2 { grid-template-columns: minmax(0, 1fr); align-items: center; }
.bd-toggle { min-height: var(--tap); font-size: .74rem; letter-spacing: .04em; }
.bd-hint {
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--text-dim);
}
.bd-dot { width: .7rem; height: .7rem; border-radius: 50%; flex-shrink: 0; }
.bd-dot.is-pred { background: var(--hot); }

/* ---- sliders ---------------------------------------------- */
.bd-sliders { display: grid; gap: .25rem 1.5rem; }
.bd-slider {
  --c: var(--accent);
  display: grid;
  gap: .05rem;
  font-size: .9rem;
  color: var(--text-dim);
  min-width: 0;
}
.bd-slider span { display: flex; align-items: center; gap: .5rem; }
.bd-slider output { margin-left: auto; font-family: var(--font-mono); color: var(--text); }
.bd-slider i { width: .65rem; height: .65rem; border-radius: 50%; background: var(--c); }
.bd-slider.is-sep { --c: var(--hot); }
.bd-slider.is-ali { --c: var(--amber); }
.bd-slider.is-coh { --c: var(--green); }
.bd-slider input {
  width: 100%;
  height: var(--tap);
  margin: 0;
  accent-color: var(--c);
  cursor: pointer;
}

.bd-k-sep { color: var(--hot); }
.bd-k-ali { color: var(--amber); }
.bd-k-coh { color: var(--green); }

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

@media (min-width: 600px) {
  .bd-sliders { grid-template-columns: 1fr 1fr; }
  .bd-row-2 { grid-template-columns: auto 1fr; }
  .bd-toggle { padding-inline: 1.2rem; }
}
@media (min-width: 900px) {
  .bd-sliders { grid-template-columns: 1fr 1fr 1fr; }
}