/* Le Chatelier's Factory: the prediction panel, the reactor hall and the graph inside the practice shell's stage. */
.lc { position: absolute; inset: 0; display: grid; grid-template-columns: 410px minmax(0, 1fr); gap: 12px; padding: 8px 12px; }
.lc-panel { display: flex; flex-direction: column; gap: 6px; min-height: 0; overflow-y: auto; padding: 2px 4px 2px 2px; }
.lc-ask { display: flex; flex-direction: column; gap: 8px; }
.lc-main { display: grid; grid-template-rows: minmax(0, 1.25fr) minmax(0, 1fr); gap: 8px; min-width: 0; min-height: 0; }
.lc-scene { position: relative; min-height: 0; border-radius: var(--tlg-radius-lg); overflow: hidden; border: 3px solid #1f2937; background: #2a3a4c; box-shadow: inset 0 0 0 2px #4b5563; }
.lc-graph { min-width: 0; min-height: 0; border: var(--tlg-border-width) solid var(--tlg-border); border-radius: var(--tlg-radius-lg); background: var(--tlg-surface); padding: 4px 6px; overflow: hidden; }
.lc-k { margin: 0 0 4px; font-size: 16px; font-weight: 800; line-height: 1.25; }
.lc-note { margin: 0; font-size: 16px; color: var(--tlg-text-muted); }
.lc-msg { margin: 0; min-height: 1.2em; font-size: 16px; font-weight: 700; color: var(--tlg-danger, #b42318); }
html[data-theme="dark"] .lc-msg { color: #ffb4a8; }
.lc-status { margin: 0; font-size: 16px; line-height: 1.3; color: var(--tlg-text-muted); }
.lc-applyrow { display: flex; }
.lc-apply { flex: 1; min-height: 48px; font-size: var(--tlg-text-lg); }

/* drag boards */
.lc-board { display: flex; flex-direction: column; gap: 4px; }
.lc-tray { display: flex; align-items: center; gap: 8px; min-height: 48px; padding: 2px 8px; border-radius: 10px; border: 2px dashed var(--tlg-border-strong); background: var(--tlg-surface-2); }
.lc-tray-k { font-size: 16px; font-weight: 700; color: var(--tlg-text-muted); }
.lc-tray-slot { display: flex; flex-wrap: wrap; gap: 6px; min-height: 44px; align-items: center; flex: 1; }
.lc-zones { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
.lc-zones--2 { grid-template-columns: 1fr; }
.lc-zone { display: flex; flex-direction: column; gap: 4px; min-height: 64px; padding: 4px 6px 6px; border-radius: 10px; border: 2px solid var(--tlg-border-strong); background: var(--tlg-surface); }
.lc-zone-k { font-size: 16px; line-height: 1.15; text-align: center; color: var(--tlg-text); }
.lc-zone-slot { display: flex; flex-wrap: wrap; gap: 4px; justify-content: center; align-items: center; flex: 1; }
.lc-zone.has-token { border-color: var(--ps-accent, #245b7a); }
.lc-tok { all: unset; box-sizing: border-box; display: inline-flex; align-items: center; justify-content: center; min-height: 44px; min-width: 52px; padding: 2px 10px; border-radius: 10px;
  font-size: 18px; font-weight: 700; line-height: 1.1; background: #ffffff; color: #111827; border: 2px solid #334155; box-shadow: 0 2px 0 #334155; cursor: grab; white-space: nowrap; }
.lc-tok:focus-visible { outline: var(--tlg-focus-width) solid var(--tlg-focus); outline-offset: 2px; }
.lc-tok--shift { font-size: 28px; min-width: 64px; background: #fde68a; border-color: #92400e; box-shadow: 0 2px 0 #92400e; }
.lc-tok--k { background: #e0e7ff; border-color: #3730a3; box-shadow: 0 2px 0 #3730a3; }
.lc-tok.is-ok { border-color: #166534; box-shadow: 0 2px 0 #166534; }
.lc-tok.is-ok::after { content: ' ✓'; color: #166534; }
.lc-tok.is-bad { border-color: #991b1b; box-shadow: 0 2px 0 #991b1b; background: #fee2e2; }
.lc-tok.is-bad::after { content: ' ✗'; color: #991b1b; }
.lc-tok.is-static { cursor: default; }
.lc-board--shift .lc-zone { min-height: 60px; }
.lc-board--shift .lc-tray { min-height: 52px; justify-content: center; }
.lc-board--shift .lc-tray-k { display: none; }
.lc-board--shift .lc-tray-slot { flex: 0 0 auto; }
.lc-board--shift { display: grid; grid-template-columns: 76px minmax(0, 1fr); grid-template-rows: auto auto; column-gap: 6px; }
.lc-board--shift > .lc-k { grid-column: 1 / -1; }
.lc-board--rows .lc-zone { min-height: 92px; }
.lc-board--rows .lc-zone-slot { flex-direction: column; }
.lc-board--k .lc-zones { gap: 0; }
.lc-board--k .lc-zone { min-height: 60px; border-radius: 10px; }
.lc-board--k .lc-zone--top { border-bottom-width: 4px; border-bottom-color: var(--tlg-text); border-radius: 10px 10px 0 0; }
.lc-board--k .lc-zone--bottom { border-top: 0; border-radius: 0 0 10px 10px; }
.lc-board--k .lc-zone-k { text-align: left; color: var(--tlg-text-muted); }
.lc-board--k > .lc-k { font-size: 22px; }
.lc-board--k .lc-tray { margin-top: 8px; }

/* chips (fate, optimize, concept questions) */
.lc-chips { display: grid; gap: 6px; }
.lc-q--fate .lc-chips { grid-template-columns: 1fr 1fr; }
.lc-chip { all: unset; box-sizing: border-box; display: flex; gap: 8px; align-items: flex-start; min-height: 44px; padding: 6px 10px; border-radius: 10px; cursor: pointer;
  border: 2px solid var(--tlg-border-strong); background: var(--tlg-surface); color: var(--tlg-text); font-size: 16px; line-height: 1.25; }
.lc-chip:focus-visible { outline: var(--tlg-focus-width) solid var(--tlg-focus); outline-offset: 2px; }
.lc-chip[aria-checked="true"] { border-color: var(--ps-accent, #245b7a); box-shadow: inset 4px 0 0 var(--ps-accent, #245b7a); background: var(--tlg-surface-2); }
.lc-chip:disabled, .lc-chip[disabled] { cursor: default; }
.lc-box { flex: none; width: 18px; height: 18px; margin-top: 1px; border: 2px solid var(--tlg-border-strong); background: var(--tlg-surface); }
.lc-chip[role="radio"] .lc-box { border-radius: 50%; }
.lc-chip[role="checkbox"] .lc-box { border-radius: 4px; }
.lc-chip[aria-checked="true"] .lc-box { background: var(--ps-accent, #245b7a); border-color: var(--ps-accent, #245b7a); box-shadow: inset 0 0 0 3px var(--tlg-surface); }
.lc-chip.is-ok { border-color: #166534; }
.lc-chip.is-ok .lc-chip-t::after { content: ' ✓'; color: #166534; font-weight: 800; }
.lc-chip.is-bad { border-color: #991b1b; }
.lc-chip.is-bad .lc-chip-t::after { content: ' ✗'; color: #991b1b; font-weight: 800; }
html[data-theme="dark"] .lc-chip.is-ok .lc-chip-t::after { color: #86efac; }
html[data-theme="dark"] .lc-chip.is-bad .lc-chip-t::after { color: #fca5a5; }

/* AP: Q vs K */
.lc-given { display: flex; flex-wrap: wrap; gap: 2px 14px; margin: 0; font-size: 16px; font-variant-numeric: tabular-nums; }
.lc-given span { white-space: nowrap; }
.lc-num .pn-key { min-height: 40px; }
.lc-num .pn-input { font-size: 24px; padding: 2px 0; }
.lc--qk .lc-board--shift .lc-zone { min-height: 48px; }
.lc--qk .lc-ask { gap: 4px; }
.lc--qk .lc-board--shift > .lc-k { margin: 0; }

/* the Briefing example */
.lc-ex { display: grid; gap: 8px; font-size: 16px; }
.lc-ex-eq { margin: 0; font-size: 20px; font-weight: 700; text-align: center; }
.lc-ex-stress { margin: 0; text-align: center; }
.lc-ex-board { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.lc-ex-board .lc-zone { min-height: 70px; }
.lc-ex-svg { width: 100%; height: auto; max-height: 180px; display: block; }
html[data-theme="dark"] .lc-ex-svg text { fill: #e5e7eb; }

@media (max-width: 1100px) { .lc { grid-template-columns: 370px minmax(0, 1fr); } }
@media (max-width: 900px) {
  .lc { position: static; grid-template-columns: 1fr; }
  .lc-main { grid-template-rows: 340px 260px; }
}
/* the assignment card sits at the foot of the customer column, so the graph's corner stays clear */
@media (min-width: 901px) {
  html.ps-locked:has(.lc) .lga-card { right: auto; left: 12px; }
  html.ps-locked:has(.lc):has(.lga-card) .ps-side { padding-bottom: 84px; }
}
.lc--qk .lc-status { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }