/* ============================================================
   Gravity Sandbox - layout

   Space is the hero, full width. Under it: two readout tiles,
   the buttons, three rows of chips (start, size, drag tool),
   then the sliders.
   ============================================================ */

.gs-stage {
  cursor: crosshair;
  height: clamp(320px, min(66svh, 115vw), 760px);
  background: var(--bg);
}
.gs-stage.is-pan { cursor: grab; }
.gs-stage:focus-visible { outline-offset: -3px; }

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

/* ---- readouts --------------------------------------------- */
.gs-stats { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.gs-stat {
  display: grid;
  gap: .1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .6rem .8rem .7rem;
  min-width: 0;
}
.gs-stat-label {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.gs-stat-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.gs-stat-note { font-family: var(--font-mono); font-size: .74rem; color: var(--text-dim); }

/* ---- buttons + chips -------------------------------------- */
.gs-row { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: .5rem; }
.gs-row .btn { min-height: var(--tap); padding-inline: .4rem; min-width: 0; }

.gs-group { display: grid; gap: .35rem; min-width: 0; }
.gs-label {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.gs-chips { display: grid; gap: .5rem; }
.gs-chips-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.gs-chips-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.gs-chips .chip {
  min-height: var(--tap);
  padding-inline: .4rem;
  min-width: 0;
  font-size: .7rem;
  letter-spacing: .04em;
}

/* Size chips: a dot sized and coloured like the body. */
.gs-size { display: inline-flex; align-items: center; justify-content: center; gap: .4rem; }
.gs-size::before {
  content: "";
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--c);
  width: var(--d);
  height: var(--d);
}
.gs-size.is-moon   { --c: var(--text-dim); --d: .4rem; }
.gs-size.is-planet { --c: var(--cyan); --d: .6rem; }
.gs-size.is-star   { --c: var(--amber); --d: .8rem; }
.gs-size[aria-pressed="true"]::before { background: var(--bg); }

/* ---- sliders ---------------------------------------------- */
.gs-sliders { display: grid; gap: .25rem 1.5rem; }
.gs-slider {
  display: grid;
  gap: .05rem;
  font-size: .9rem;
  color: var(--text-dim);
  min-width: 0;
}
.gs-slider span { display: flex; justify-content: space-between; gap: .5rem; }
.gs-slider output { font-family: var(--font-mono); color: var(--text); }
.gs-slider input {
  width: 100%;
  height: var(--tap);
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

.gs-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) {
  .gs-chips-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .gs-sliders { grid-template-columns: 1fr 1fr; }
  .gs-stat-value { font-size: 1.3rem; }
}