/* Adaptive Tile Refresh — Carmack's 1990 EGA scroll trick, made obvious.
   Naive: repaint every tile each frame. Adaptive: repaint only the new edge.
   The big number drops 112 -> 8 the instant you switch. Vanilla, no build. */

#tile-refresh-demo {
  --tr-accent: #30d158;     /* adaptive / the win (calm green) */
  --tr-warn: #ffd60a;       /* "a lot of work" amber, used sparingly */
  --tr-repaint: #ffffff;    /* repaint flash */
  font-family: var(--font-family, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif);
  background: var(--color-bg-elevated, #111111);
  border: 1px solid var(--color-border, rgba(255, 255, 255, 0.1));
  border-radius: 16px;
  padding: clamp(16px, 3vw, 26px);
  margin: 2.5rem 0;
  color: var(--color-text-primary, #ffffff);
}

.tr-title { font-size: 1rem; font-weight: 650; letter-spacing: -0.01em; }
.tr-explain {
  font-size: 0.9rem; line-height: 1.55; margin: 8px 0 18px;
  color: var(--color-text-secondary, rgba(255, 255, 255, 0.7));
}

/* clean segmented control — no alarm colors */
.tr-modes {
  display: flex; gap: 4px; margin: 0 0 18px; padding: 4px;
  background: var(--color-bg-surface, #1a1a1a);
  border: 1px solid var(--color-border-subtle, rgba(255,255,255,0.07));
  border-radius: 11px;
}
#tile-refresh-demo .tr-mode {
  appearance: none; flex: 1 1 0;
  border: 0; background: transparent !important;
  color: var(--color-text-secondary, rgba(255, 255, 255, 0.62));
  font: inherit; font-size: 0.84rem; font-weight: 550; padding: 9px 12px;
  border-radius: 8px; cursor: pointer;
  transition: color 0.18s, background 0.18s;
}
#tile-refresh-demo .tr-mode:hover { color: var(--color-text-primary, #fff); }
#tile-refresh-demo .tr-mode.is-on {
  color: #0b0b0b !important; font-weight: 650;
  background: var(--color-accent, #ffffff) !important;
}

/* viewport grid */
.tr-stage {
  background: var(--color-bg-surface, #1a1a1a);
  border: 1px solid var(--color-border-subtle, rgba(255,255,255,0.06));
  border-radius: 12px; padding: 18px; display: flex; justify-content: center; overflow-x: auto;
}
.tr-grid { display: grid; gap: 2px; background: rgba(0,0,0,0.4); padding: 4px; border-radius: 8px; }
.tr-cell { width: var(--tr-cell, 30px); height: var(--tr-cell, 30px); border-radius: 3px; position: relative; }
.tr-cell.is-repaint::after {
  content: ""; position: absolute; inset: 0; border-radius: 3px;
  box-shadow: inset 0 0 0 2px var(--tr-repaint), 0 0 8px rgba(255,255,255,0.5);
  animation: trFlash 0.5s ease-out forwards;
}
@keyframes trFlash { from { opacity: 1; } to { opacity: 0; } }

/* readout card — shows the value at a glance */
.tr-readout {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  margin: 18px 0 14px; padding: 14px 18px;
  background: var(--color-bg-surface, #1a1a1a);
  border: 1px solid var(--color-border, rgba(255,255,255,0.12));
  border-radius: 12px;
  transition: border-color 0.2s;
}
.tr-readout.is-adaptive { border-color: var(--tr-accent); }
.tr-num {
  font-family: var(--font-mono, "SF Mono", Monaco, monospace);
  font-size: 2.4rem; font-weight: 700; line-height: 1; color: #fff;
  font-variant-numeric: tabular-nums;
}
.tr-readout.is-adaptive .tr-num { color: var(--tr-accent); }
.tr-of { font-size: 0.92rem; line-height: 1.4; color: var(--color-text-secondary, rgba(255,255,255,0.72)); }
.tr-of b { color: #fff; font-variant-numeric: tabular-nums; }
.tr-ratio {
  margin-left: auto; align-self: center; white-space: nowrap; display: none;
  font-size: 0.82rem; font-weight: 700; padding: 7px 13px; border-radius: 999px;
  background: rgba(48,209,88,0.16); color: var(--tr-accent);
}
.tr-readout.is-adaptive .tr-ratio { display: inline-block; }
@media (max-width: 520px) { .tr-ratio { margin-left: 0; } }

/* controls */
.tr-controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.tr-btn {
  appearance: none; border: 1px solid var(--color-border, rgba(255,255,255,0.15));
  background: transparent; color: var(--color-text-primary, #fff);
  font: inherit; font-size: 0.92rem; padding: 8px 16px; border-radius: 9px; cursor: pointer;
  transition: border-color 0.18s, background 0.18s;
}
.tr-btn:hover { border-color: rgba(255,255,255,0.35); background: rgba(255,255,255,0.05); }
.tr-play[aria-pressed="true"] { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.3); }

.tr-status {
  margin-top: 14px;
  background: var(--color-bg-surface, #1a1a1a);
  border: 1px solid var(--color-border-subtle, rgba(255,255,255,0.09));
  border-radius: 10px; padding: 12px 16px; font-size: 0.9rem; line-height: 1.55;
  color: var(--color-text-secondary, rgba(255,255,255,0.78)); min-height: 1.4em;
  transition: border-color 0.2s;
}
.tr-status strong { color: #fff; }
.tr-status.is-adaptive { border-color: var(--tr-accent); }
.tr-noscript { font-size: 0.9rem; color: var(--color-text-secondary, rgba(255,255,255,0.65)); line-height: 1.6; }

@media (prefers-reduced-motion: reduce) {
  .tr-cell.is-repaint::after { animation: none; opacity: 0.9; }
}