/* ============================================================
   Teach a Robot - layout

   Phone: the square scene fills the width, controls stack under it.
   Wide screens: scene on the left, controls in a column on the right.
   ============================================================ */

.tr-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

/* The scene is square. Its canvas fills it (kit/canvas.js). */
.tr-stage {
  height: auto;
  aspect-ratio: 1 / 1;
  cursor: pointer;
}
.tr-stage:focus-visible { outline-offset: -3px; }

.tr-side {
  display: grid;
  gap: .85rem;
  padding: 1rem clamp(1rem, 4vw, 1.25rem) 0;
  min-width: 0;
}

/* ---- button rows ------------------------------------------ */
.tr-group {
  display: grid;
  gap: .5rem;
  min-width: 0;
}
.tr-scenes { grid-template-columns: 1fr 1fr; }
.tr-run    { grid-template-columns: 1.4fr 1fr 1fr; }
.tr-tools  { grid-template-columns: 1fr 1fr; }
.tr-decay  { grid-template-columns: auto minmax(0, 1fr); align-items: center; }

.tr-side .btn,
.tr-side .chip {
  min-height: var(--tap);
  padding-inline: .4rem;
  min-width: 0;
}
.tr-side .chip { font-size: .72rem; letter-spacing: .04em; }

/* Train and Watch light up while they run. */
.tr-run .btn[aria-pressed="true"] { box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent); }

.tr-label {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding-right: .2rem;
}

/* ---- the reward chart ------------------------------------- */
.tr-card {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .55rem .6rem .6rem;
  min-width: 0;
}
.tr-card figcaption,
.tr-note {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .25rem .5rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin: 0 .2rem .35rem;
}
.tr-note { margin: .45rem .2rem 0; letter-spacing: .06em; }
.tr-note output,
.tr-avg { color: var(--text); letter-spacing: .04em; }
.tr-box { position: relative; width: 100%; height: 110px; }
.tr-box > canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

/* ---- sliders ---------------------------------------------- */
.tr-sliders { display: grid; gap: .35rem; }
.tr-slider {
  display: grid;
  gap: .1rem;
  font-size: .9rem;
  color: var(--text-dim);
}
.tr-slider span { display: flex; justify-content: space-between; gap: .5rem; }
.tr-slider output { font-family: var(--font-mono); color: var(--text); }
.tr-slider input {
  width: 100%;
  height: var(--tap);
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

.tr-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;
}

/* ---- wide screens: side by side --------------------------- */
@media (min-width: 880px) {
  .tr-layout {
    grid-template-columns: minmax(0, min(640px, calc(100svh - var(--bar-h) - 2.5rem))) minmax(320px, 400px);
    justify-content: center;
    gap: 1.5rem;
    padding: 1.25rem clamp(1rem, 3vw, 2rem) 0;
  }
  .tr-stage {
    border: 1px solid var(--line);
    border-radius: var(--radius);
  }
  .tr-side { padding: 0; align-content: start; }
}