/* Hopfield associative memory — the energy-based idea Hinton & Hopfield were
   honored for. Stored patterns are low-energy valleys; show the network a corrupted
   version and it flips units to reduce energy until it settles into the nearest
   stored memory. Recall the whole from a fragment, no address, no search.
   Vanilla JS, no deps, no build. Dark theme. Palette shared with sibling widgets:
   cyan = an active unit, green = a perfectly recalled memory (the win). No red. */

#hopfield-memory {
  --hf-on: #5ac8fa;                  /* a unit that is "on" (+1) */
  --hf-win: #30d158;                 /* a perfectly recalled stored pattern */
  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);
}

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

.hf-stage { display: flex; gap: 22px; flex-wrap: wrap; align-items: flex-start; }

/* the grid */
.hf-grid { display: grid; gap: 3px; background: rgba(0,0,0,0.4); padding: 5px; border-radius: 10px; }
.hf-cell {
  width: var(--hf-cell, 30px); height: var(--hf-cell, 30px); border-radius: 4px;
  background: var(--color-bg-surface, #1c1c1f); cursor: pointer;
  transition: background 0.18s ease, box-shadow 0.18s ease;
}
.hf-cell.on { background: var(--hf-on); }
.hf-grid.won .hf-cell.on { background: var(--hf-win); }
.hf-cell.flip { box-shadow: 0 0 0 2px rgba(255,255,255,0.5); }

/* stored-pattern thumbnails to pick from */
.hf-side { display: flex; flex-direction: column; gap: 12px; min-width: 150px; }
.hf-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.09em; color: var(--color-text-tertiary, rgba(255,255,255,0.42)); margin: 0; }
.hf-stored { display: flex; gap: 8px; }
.hf-thumb {
  display: grid; gap: 1px; padding: 3px; border-radius: 6px; cursor: pointer;
  background: rgba(255,255,255,0.04); border: 1px solid var(--color-border, rgba(255,255,255,0.14));
  transition: border-color 0.15s, background 0.15s;
}
.hf-thumb:hover { border-color: rgba(255,255,255,0.4); }
.hf-thumb i { width: 7px; height: 7px; border-radius: 1px; background: var(--color-bg-surface,#1c1c1f); display: block; }
.hf-thumb i.on { background: var(--hf-on); }

.hf-readout {
  background: var(--color-bg-surface, #1a1a1a);
  border: 1px solid var(--color-border-subtle, rgba(255,255,255,0.08));
  border-radius: 12px; padding: 12px 14px; transition: border-color 0.25s;
}
.hf-readout.won { border-color: var(--hf-win); }
.hf-energy { font-size: 0.82rem; color: var(--color-text-secondary, rgba(255,255,255,0.6)); }
.hf-energy b { color: #fff; font-variant-numeric: tabular-nums; font-size: 1.05rem; display:block; }
.hf-status { font-size: 0.86rem; line-height: 1.45; margin-top: 8px; color: var(--color-text-secondary, rgba(255,255,255,0.72)); min-height: 2.6em; }
.hf-status b { color: #fff; }
.hf-status .hf-recalled { color: var(--hf-win); font-weight: 650; }

.hf-controls { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.hf-btn {
  appearance: none; cursor: pointer; font: inherit; font-size: 0.88rem;
  border: 1px solid var(--color-border, rgba(255,255,255,0.15)); background: transparent;
  color: var(--color-text-primary, #fff); border-radius: 9px; padding: 9px 16px;
  transition: border-color 0.15s, background 0.15s, opacity 0.15s;
}
.hf-btn:hover:not(:disabled) { border-color: rgba(255,255,255,0.4); background: rgba(255,255,255,0.05); }
.hf-btn:disabled { opacity: 0.45; cursor: default; }
.hf-btn--primary { background: var(--color-accent, #fff); border-color: var(--color-accent, #fff); color: #0b0b0b; font-weight: 650; }
.hf-btn--primary:hover:not(:disabled) { opacity: 0.9; background: var(--color-accent, #fff); }
.hf-hint { font-size: 0.8rem; color: var(--color-text-tertiary, rgba(255,255,255,0.42)); align-self: center; }

.hf-noscript { font-size: 0.9rem; color: var(--color-text-secondary, rgba(255,255,255,0.65)); line-height: 1.6; }