/* Circuit lab: app bar, palette rail, circuit canvas, live panels. Shared tokens come from theme.css. */
#view-study.lab-host { max-width: none; padding: 0; }
.lab-shell { display: grid; grid-template-rows: auto 1fr; min-height: calc(100dvh - var(--header, 56px)); }
.lab-shell > h1 { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.lab-visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.circuit-lab { display: grid; grid-template-rows: auto auto 1fr; gap: 0; min-width: 0; color: var(--text); }

/* App bar */
.lab-bar { position: relative; z-index: 20; display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1.5fr); align-items: center; gap: 16px; padding: 10px clamp(12px, 2vw, 24px); border-bottom: 1px solid var(--border); background: color-mix(in srgb, var(--panel) 92%, transparent); backdrop-filter: blur(10px); }
.lab-identity { display: flex; align-items: center; gap: 14px; min-width: 0; }
.lab-name input { width: min(100%, 20rem); min-height: 40px; padding: 6px 10px; font: inherit; font-size: 18px; font-weight: 700; color: var(--text); background: transparent; border: 1px solid transparent; border-radius: 10px; }
.lab-name input:hover { border-color: var(--border); }
.lab-name input:focus-visible { outline: none; border-color: #5cecff; background: var(--sunken); }
.lab-stepper { display: inline-flex; align-items: center; gap: 4px; padding: 3px 6px 3px 10px; border: 1px solid var(--border); border-radius: 999px; background: var(--sunken); }
.lab-stepper-label { font-size: 13px; color: var(--muted); margin-right: 4px; }
.lab-stepper input { width: 2.4rem; min-height: 30px; text-align: center; font: inherit; font-size: 15px; font-weight: 600; color: var(--text); background: transparent; border: 0; -moz-appearance: textfield; }
.lab-stepper input::-webkit-outer-spin-button, .lab-stepper input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.lab-step { width: 30px; height: 30px; font: inherit; font-size: 16px; color: var(--text); background: var(--panel); border: 1px solid var(--border); border-radius: 50%; cursor: pointer; transition: background .12s ease, transform .12s ease; }
.lab-step:hover { background: var(--raised); } .lab-step:active { transform: scale(.92); }
.lab-run { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.lab-run-button { min-width: 8.5rem; box-shadow: 0 0 0 0 rgba(92, 236, 255, .5); transition: box-shadow .3s ease, transform .12s ease; }
.lab-run-button:hover { box-shadow: 0 0 22px rgba(92, 236, 255, .45); }
.lab-run-button:active { transform: scale(.97); }
.is-busy .lab-run-button, .is-busy .lab-tools .btn { opacity: .7; cursor: progress; }
.lab-settings { position: relative; }
.lab-settings > summary { list-style: none; cursor: pointer; }
.lab-settings > summary::-webkit-details-marker { display: none; }
.lab-settings-grid { position: absolute; top: calc(100% + 8px); left: 0; z-index: 25; display: grid; gap: 10px; min-width: 14rem; padding: 12px; border: 1px solid var(--border); border-radius: 12px; background: var(--panel); box-shadow: 0 14px 40px rgba(0, 0, 0, .35); }
.lab-tools { display: flex; flex-wrap: wrap; justify-content: flex-end; align-items: center; gap: 8px; }
.lab-tool-group { display: inline-flex; gap: 0; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.lab-tool-group .btn { min-height: 38px; border: 0; border-radius: 0; padding: 6px 12px; }
.lab-tool-group .btn + .btn { border-left: 1px solid var(--border); }
.lab-tools > .btn, .lab-run .btn, .lab-settings > summary { min-height: 38px; padding: 6px 14px; border-radius: 10px; }
.lab-tools .btn:disabled { opacity: .4; cursor: not-allowed; }
.lab-field { display: grid; gap: 4px; font-size: 13px; color: var(--muted); }
.lab-field input { min-height: 36px; width: 100%; padding: 6px 10px; font: inherit; font-size: 15px; color: var(--text); background: var(--sunken); border: 1px solid var(--border-strong); border-radius: 10px; box-sizing: border-box; }
.lab-field input:focus-visible { outline: 2px solid #5cecff; outline-offset: 1px; }

/* Menus and dialogs */
.lab-menu { position: relative; }
.lab-menu-button::after { content: ' ▾'; font-size: 11px; color: var(--muted); }
.lab-menu-list { position: absolute; right: 0; top: calc(100% + 6px); z-index: 25; display: grid; min-width: 15rem; padding: 6px; border: 1px solid var(--border); border-radius: 12px; background: var(--panel); box-shadow: 0 14px 40px rgba(0, 0, 0, .35); animation: lab-pop .14s ease; }
.lab-menu-item { display: grid; gap: 2px; padding: 8px 10px; text-align: left; font: inherit; color: var(--text); background: transparent; border: 0; border-radius: 8px; cursor: pointer; }
.lab-menu-item:hover, .lab-menu-item:focus-visible { background: var(--raised); outline: none; }
.lab-menu-item small { color: var(--muted); font-size: 13px; }
.lab-dialog { width: min(480px, 92vw); padding: 0; border: 1px solid var(--border); border-radius: 16px; background: var(--panel); color: var(--text); box-shadow: 0 30px 80px rgba(0, 0, 0, .5); }
.lab-dialog::backdrop { background: rgba(4, 6, 12, .6); backdrop-filter: blur(3px); }
.lab-dialog form { display: grid; gap: 12px; padding: 20px; }
.lab-dialog h2 { margin: 0; font-size: 18px; }
.lab-dialog-list { display: grid; gap: 4px; max-height: 50vh; overflow: auto; }
.lab-dialog-item { display: grid; gap: 2px; padding: 10px 12px; text-align: left; font: inherit; color: var(--text); background: var(--sunken); border: 1px solid transparent; border-radius: 10px; cursor: pointer; }
.lab-dialog-item[aria-selected=true] { border-color: #5cecff; }
.lab-dialog-item small { color: var(--muted); font-size: 13px; }
.lab-dialog-empty { margin: 0; color: var(--muted); }
.lab-dialog-actions { display: flex; justify-content: flex-end; gap: 8px; }

/* Body */
.lab-body { display: grid; grid-template-columns: 232px minmax(0, 1fr) 420px; gap: 14px; align-items: start; padding: 14px clamp(12px, 2vw, 24px) 32px; }
.lab-rail, .lab-side, .lab-canvas, .lab-results { border: 1px solid var(--border); border-radius: 14px; background: var(--panel); }
.lab-rail { position: sticky; top: calc(var(--header, 56px) + 14px); display: grid; gap: 12px; padding: 12px; max-height: calc(100dvh - var(--header, 56px) - 80px); overflow: auto; }
.lab-group-title { margin: 0 0 6px; font-size: 13px; font-weight: 600; color: var(--muted); }
.lab-tiles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.lab-tile { position: relative; min-height: 44px; border: 1px solid transparent; border-radius: 10px; color: #0b1020; font: inherit; font-weight: 700; font-size: 14px; cursor: grab; transition: transform .12s ease, box-shadow .12s ease, filter .12s ease; }
.lab-tile:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(0, 0, 0, .35); filter: brightness(1.08); }
.lab-tile:active, .lab-tile.is-dragging { cursor: grabbing; transform: scale(.96); }
.lab-tile[aria-pressed=true] { border-color: #fff; box-shadow: 0 0 0 2px rgba(255, 255, 255, .35); }
.lab-tile:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.fam-pauli { background: #8f6cff; } .fam-hadamard { background: #22c7e6; } .fam-phase { background: #e0a92a; } .fam-rotation { background: #e27cc8; } .fam-multi { background: #38b26b; } .fam-swap { background: #4f8dff; }
.lab-place summary, .lab-challenge summary { cursor: pointer; font-size: 13px; font-weight: 600; color: var(--muted); }
.lab-place-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 8rem), 1fr)); gap: 8px; margin-top: 8px; }
.lab-place-grid .lab-field, .lab-place-grid input { min-width: 0; max-width: 100%; }
.lab-challenge { display: block; min-width: 0; max-width: 100%; padding-top: 10px; border-top: 1px solid var(--border); }
.lab-challenge-content { display: grid; grid-template-columns: minmax(0, 1fr); gap: 8px; margin-top: 8px; min-width: 0; }
.lab-challenge select { box-sizing: border-box; width: 100%; min-width: 0; text-overflow: ellipsis; min-height: 38px; max-width: 100%; padding: 6px 8px; font: inherit; font-size: 14px; color: var(--text); background: var(--sunken); border: 1px solid var(--border-strong); border-radius: 10px; }
.lab-prompt { overflow-wrap: anywhere; min-width: 0; margin: 0; font-size: 14px; line-height: 1.5; color: var(--muted); }
.lab-prompt:empty { display: none; }
.lab-challenge-actions { display: flex; flex-wrap: wrap; gap: 6px; }
.lab-challenge-actions .btn { max-width: 100%; white-space: normal; overflow-wrap: anywhere; min-height: 36px; padding: 6px 12px; border-radius: 10px; }

/* Canvas */
.lab-centre { display: grid; gap: 12px; min-width: 0; }
.lab-canvas { display: grid; gap: 8px; padding: 10px 12px 12px; background: radial-gradient(circle at 15% 0%, rgba(92, 236, 255, .07), transparent 45%), var(--panel); }
.lab-canvas-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 14px; }
.lab-count { margin: 0; font-size: 13px; color: var(--muted); }
.lab-count output { font-weight: 700; color: var(--text); }
.lab-measure { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.lab-measure::before { content: 'Measure'; font-size: 13px; color: var(--muted); margin-right: 4px; }
.lab-switch { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; font-size: 13px; font-weight: 600; border: 1px solid var(--border); border-radius: 999px; background: var(--sunken); cursor: pointer; transition: border-color .12s ease, background .12s ease; }
.lab-switch:has(input:checked) { border-color: #9aa8c7; background: color-mix(in srgb, #9aa8c7 25%, var(--sunken)); }
.lab-switch input { accent-color: #5cecff; margin: 0; }
.lab-scroll { overflow-x: auto; padding: 4px 0; }
.lab-picture { display: block; min-width: 100%; }
.lab-wire { filter: drop-shadow(0 0 0 transparent); }
.lab-gate { transition: transform .15s ease; transform-box: fill-box; transform-origin: center; outline: none; }
.lab-gate:hover { filter: brightness(1.15); }
.lab-gate:focus-visible rect:first-of-type, .lab-gate:focus-visible circle:first-of-type { stroke: #fff; stroke-width: 2; }
.lab-gate.is-new { animation: lab-gate-in .16s ease-out; }
.lab-cell { transition: opacity .12s ease; }
.lab-cell:hover { opacity: .25 !important; fill: #5cecff; }
.lab-meter { transition: filter .12s ease; transform-box: fill-box; transform-origin: center; outline: none; }
.lab-meter:hover { filter: brightness(1.3); }
.lab-meter:focus-visible rect { stroke: #fff; }
.lab-meter.is-on .lab-needle { animation: lab-needle .18s ease-out; transform-box: fill-box; transform-origin: 0% 100%; }
.lab-sweep { animation: lab-sweep .45s ease-out forwards; transform-box: fill-box; }
.lab-selected { display: flex; flex-wrap: wrap; align-items: end; gap: 10px; font-size: 14px; }
.lab-selected:empty { display: none; }
.lab-selected .lab-field input { width: 6rem; }
.lab-board { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.lab-add { min-height: 30px; padding: 3px 10px; font: inherit; font-size: 13px; color: var(--muted); background: transparent; border: 1px dashed var(--border-strong); border-radius: 999px; cursor: pointer; }
.lab-add:hover { color: var(--text); border-color: #5cecff; }
.lab-status { margin: 0; padding: 8px 12px; border-left: 3px solid #5cecff; border-radius: 0 10px 10px 0; background: var(--sunken); font-size: 14px; line-height: 1.5; }
.lab-status:empty { display: none; }
.lab-status.is-live { animation: lab-fade .3s ease; }
.lab-status a { overflow-wrap: anywhere; }
.lab-results { padding: 12px 14px; }
.lab-results:empty { display: none; }
.lab-results.is-live { animation: lab-fade .35s ease; }

/* Side panels */
.lab-side { position: sticky; top: calc(var(--header, 56px) + 14px); display: grid; grid-template-rows: auto 1fr; max-height: calc(100dvh - var(--header, 56px) - 80px); overflow: hidden; }
.lab-tabs { display: flex; border-bottom: 1px solid var(--border); background: var(--sunken); }
.lab-tabs [role=tab] { flex: 1; min-height: 42px; font: inherit; font-size: 14px; font-weight: 600; color: var(--muted); background: transparent; border: 0; border-bottom: 2px solid transparent; cursor: pointer; transition: color .12s ease; }
.lab-tabs [role=tab][aria-selected=true] { color: var(--text); border-bottom-color: #5cecff; }
.lab-panel { padding: 12px; overflow: auto; }
.lab-panel.is-live > * { animation: lab-fade .3s ease; }
.lab-panel pre { margin: 0; padding: 12px; overflow: auto; border-radius: 10px; background: var(--sunken); font-size: 13px; line-height: 1.6; }
.lab-code-tools { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px; margin-bottom: 10px; }
.lab-code-switch { display: inline-flex; gap: 4px; }
.lab-chip { min-height: 32px; padding: 4px 12px; font: inherit; font-size: 13px; font-weight: 600; color: var(--muted); background: var(--sunken); border: 1px solid var(--border); border-radius: 999px; cursor: pointer; }
.lab-chip[aria-pressed=true] { color: var(--text); border-color: #5cecff; }
.lab-copy { min-height: 32px; padding: 4px 12px; border-radius: 999px; }
.lab-link-note { margin: 0 0 12px; font-size: 14px; color: var(--muted); }
.lab-link-note[role=alert] { color: #ff8fa3; }
.lab-explain { margin: 8px 0 12px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; font-size: 13px; line-height: 1.55; color: var(--muted); }
.lab-explain h3 { margin: 0 0 6px; font-size: 14px; color: inherit; }
.lab-explain p { margin: 0 0 6px; }
.lab-legend { margin: 0 0 8px; font-size: 13px; color: var(--muted); line-height: 1.5; }
.lab-histogram-bar { animation: interface-appear .18s ease-out; }
.lab-counts { width: 100%; margin-top: 8px; border-collapse: collapse; font-size: 14px; font-variant-numeric: tabular-nums; }
.lab-counts caption { caption-side: top; text-align: left; font-weight: 600; padding: 4px 0; }
.lab-counts th, .lab-counts td { padding: 6px 8px; text-align: left; border-top: 1px solid var(--border); }
.lab-verdict { margin: 0 0 6px; padding: 8px 12px; border-radius: 10px; font-weight: 600; animation: lab-pop .25s ease; }
.lab-verdict.is-ok { background: rgba(126, 231, 135, .15); color: var(--green); }
.lab-verdict.is-off { background: rgba(255, 143, 163, .15); color: #ff8fa3; }
.lab-fidelity { margin: 0 0 10px; font-size: 14px; }
.lab-fidelity output { font-weight: 700; font-variant-numeric: tabular-nums; }
.complex-state-view { font-size: 13px; }
.lab-panel .complex-state-view table { display: block; max-width: 100%; overflow-x: auto; font-size: 13px; }
.lab-panel .complex-state-view th, .lab-panel .complex-state-view td { padding: 3px 5px; white-space: nowrap; }
.complex-state-view > p:first-child { margin: 0 0 4px; font-weight: 600; }
.complex-state-view table { border-collapse: collapse; font-variant-numeric: tabular-nums; }
.complex-state-view th, .complex-state-view td { padding: 4px 6px; }

/* Modes */
.circuit-lab.is-assessment .lab-body { grid-template-columns: 228px minmax(0, 1fr); padding: 0; }
.circuit-lab.is-assessment .lab-bar { position: static; grid-template-columns: 1fr; justify-items: start; border: 0; background: transparent; padding: 0 0 10px; }
.circuit-lab.is-assessment .lab-rail, .circuit-lab.is-assessment .lab-side { position: static; max-height: none; }
.circuit-lab.is-compact .lab-body { grid-template-columns: 200px minmax(0, 1fr); padding: 0; }
.circuit-lab.is-compact .lab-side { grid-column: 1 / -1; position: static; max-height: none; }
.circuit-lab.is-compact .lab-bar { position: static; }

/* Motion */
@keyframes lab-gate-in { from { transform: scale(.96); opacity: .35; } to { transform: scale(1); opacity: 1; } }
@keyframes lab-needle { from { transform: rotate(-12deg); } to { transform: rotate(0); } }
@keyframes lab-sweep { from { transform: translateX(0); opacity: .9; } to { transform: translateX(var(--sweep, 500px)); opacity: 0; } }
@keyframes lab-fade { from { opacity: 0; transform: translateY(2px); } to { opacity: 1; transform: none; } }
@keyframes lab-pop { from { opacity: 0; transform: scale(.96); } to { opacity: 1; transform: none; } }

@media (max-width: 1280px) { .lab-body { grid-template-columns: 212px minmax(0, 1fr) 360px; } }
@media (max-width: 1100px) { .lab-body { grid-template-columns: 200px minmax(0, 1fr); } .lab-side { grid-column: 1 / -1; position: static; max-height: none; } .lab-bar { grid-template-columns: minmax(0, 1fr) auto; } .lab-tools { grid-column: 1 / -1; justify-content: flex-start; } }
@media (max-width: 760px) { .lab-body { grid-template-columns: 1fr; padding: 10px 12px 24px; } .lab-rail { position: static; max-height: none; } .lab-tiles { grid-template-columns: repeat(6, 1fr); } .lab-bar { position: static; grid-template-columns: 1fr; } .lab-identity { flex-wrap: wrap; } .lab-name input { width: 100%; } }
@media (prefers-reduced-motion: reduce) { .lab-tile, .lab-gate, .lab-bar, .lab-cell, .lab-step, .lab-run-button { transition: none; } .lab-gate.is-new, .lab-sweep, .lab-status.is-live, .lab-results.is-live, .lab-panel.is-live > *, .lab-verdict, .lab-menu-list, .lab-meter.is-on .lab-needle { animation: none; } }

.circuit-lab .lab-icon-button { display: inline-flex; align-items: center; justify-content: center; width: 40px; min-width: 40px; height: 40px; padding: 8px; flex-shrink: 0; }
.lab-icon-button svg { display: block; pointer-events: none; }
.lab-menu-button.lab-icon-button::after { content: none; }
.lab-icon-button:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }

.lab-local-state { min-width: 0; overflow-x: auto; }
.lab-local-state .complex-state-view { max-width: none; }

.lab-body, .lab-body > *, .lab-rail > *, .lab-name { min-width: 0; }
.lab-name { flex: 1 1 auto; }
.lab-identity .lab-stepper { flex: 0 0 auto; }
.lab-rail { grid-template-columns: minmax(0, 1fr); overscroll-behavior: contain; }
.lab-name input { box-sizing: border-box; max-width: 100%; }

#view-study.lab-host > .site-footer { padding: 20px clamp(12px, 2vw, 24px); margin-top: 0; }

.lab-meter-toggle { display: inline-flex; align-items: center; gap: 8px; min-height: 36px; padding: 6px 10px; color: var(--text); font: inherit; font-size: 13px; border: 1px solid var(--border-strong); background: var(--raised); border-radius: 6px; box-shadow: 0 2px 0 var(--border-strong); cursor: pointer; }
.lab-meter-toggle[aria-pressed="true"] { color: var(--green); border-color: var(--green); background: color-mix(in srgb, var(--green) 15%, var(--panel)); box-shadow: inset 0 2px 4px #0004; }
.lab-meter-toggle:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; }
.lab-meter-state { font-size: 13px; font-weight: 700; }

.lab-rail { position: static; max-height: none; overflow: visible; }
.lab-rail-title { margin: 0; font-size: 16px; color: var(--text); }

.circuit-lab > .lab-status { margin: 8px clamp(12px, 2vw, 24px) 0; }
.circuit-lab > .lab-status[role="alert"] { border-color: var(--error); color: var(--error); }

.lab-measured-wires { margin: 0 0 10px; font-size: 13px; color: var(--text); }

.lab-scroll-note { display: none; margin: 0; font-size: 13px; color: var(--muted); }
@media (pointer: coarse) {
  .lab-step { width: 44px; height: 44px; }
  .lab-stepper input { min-height: 44px; min-width: 44px; }
  .lab-tool-group .btn, .lab-tools > .btn, .lab-run .btn, .lab-settings > summary, .lab-field input { min-height: 44px; }
  .circuit-lab .lab-icon-button { width: 44px; min-width: 44px; height: 44px; }
}
@media (max-width: 900px) {
  .lab-scroll { overflow-x: auto; background: linear-gradient(to left, rgba(92, 236, 255, .18), transparent 24px) right / 24px 100% no-repeat; }
  .lab-settings-grid { max-width: calc(100vw - 24px); overflow-x: auto; background: linear-gradient(to left, rgba(92, 236, 255, .18), transparent 24px) right / 24px 100% no-repeat, var(--panel); }
  .lab-scroll-note { display: block; }
}

/* The tool row keeps one line on a wide screen and moves under the title on a narrow one, left aligned, so the buttons do not float at two heights. */
@media (max-width: 1280px) { .lab-bar { grid-template-columns: minmax(0, 1fr) auto; } .lab-tools { grid-column: 1 / -1; justify-content: flex-start; } }
.lab-share-note { margin: 0; padding: 0 clamp(12px, 2vw, 24px) 10px; font-size: 14px; color: var(--muted); }

/* Circuit workspace hierarchy. */
.circuit-lab > .lab-bar {
  grid-template-columns: minmax(220px, 1fr) auto minmax(220px, 1fr);
  gap: 12px 16px;
  padding-block: 16px;
  background: var(--panel);
  backdrop-filter: none;
}
.circuit-lab > .lab-bar .lab-identity { grid-column: 1; grid-row: 1; flex-wrap: wrap; }
.circuit-lab > .lab-bar .lab-tools { grid-column: 2; grid-row: 1; justify-content: center; }
.circuit-lab > .lab-bar .lab-run { grid-column: 3; grid-row: 1; justify-content: flex-end; }
.circuit-lab .lab-name { display: flex; align-items: center; flex: 1 1 180px; }
.circuit-lab .lab-name input { width: 100%; min-width: 0; }
.circuit-lab .lab-labeled-action { width: auto; min-width: 44px; gap: 8px; padding: 8px 12px; }
.lab-action-label { font-size: 14px; font-weight: 600; white-space: nowrap; }
.circuit-lab .lab-run-button { min-width: 128px; box-shadow: none; }
.circuit-lab .lab-body { grid-template-columns: 208px minmax(0, 1fr) 320px; gap: 20px; padding-top: 20px; }
.circuit-lab :is(.lab-rail, .lab-side, .lab-canvas, .lab-results) { border-radius: 8px; }
.circuit-lab .lab-rail { gap: 16px; padding: 16px; }
.lab-rail-title { margin: 0; font-size: 18px; }
.lab-palette-help, .lab-gate-help { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.lab-gate-help { padding: 12px 0; border-block: 1px solid var(--border); min-height: 5em; }
.circuit-lab .lab-palette { display: grid; grid-template-columns: minmax(0, 1fr); min-width: 0; gap: 16px; }
.circuit-lab .lab-group { min-width: 0; }
.circuit-lab .lab-tiles { min-width: 0; grid-template-columns: repeat(auto-fit, minmax(min(100%, 3.5rem), 1fr)); }
.circuit-lab .lab-group-title { margin-bottom: 8px; }
.circuit-lab .lab-tile { min-width: 0; max-width: 100%; overflow-wrap: anywhere; padding: 8px 4px; border-radius: 6px; background: color-mix(in srgb, var(--gate-accent) 14%, var(--panel)); border: 1px solid color-mix(in srgb, var(--gate-accent) 50%, var(--border)); color: var(--text); box-shadow: none; }
.circuit-lab .lab-tile:hover { transform: none; filter: none; background: color-mix(in srgb, var(--gate-accent) 27%, var(--panel)); }
.circuit-lab .lab-tile[aria-pressed=true] { border-color: var(--gate-accent); box-shadow: inset 0 -3px var(--gate-accent); }
.circuit-lab .lab-tile:focus-visible { outline: 3px solid var(--amber); outline-offset: 3px; }
.circuit-lab .fam-pauli { --gate-accent: #8f6cff; }
.circuit-lab .fam-hadamard { --gate-accent: #22c7e6; }
.circuit-lab .fam-phase { --gate-accent: #e0a92a; }
.circuit-lab .fam-rotation { --gate-accent: #e27cc8; }
.circuit-lab .fam-multi { --gate-accent: #38b26b; }
.circuit-lab .fam-swap { --gate-accent: #4f8dff; }
.circuit-lab .lab-canvas { padding: 18px; background: var(--panel); }
.circuit-lab .lab-canvas-head { padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.circuit-lab .lab-scroll { padding-block: 16px; }
.circuit-lab .lab-selected { padding-top: 12px; border-top: 1px solid var(--border); }
.circuit-lab .lab-results { padding: 20px; }
.circuit-lab .complex-state-view { font-size: 14px; }
.circuit-lab .complex-state-view > p:first-child { font-size: 17px; margin-bottom: 12px; }
.state-amplitude-details { margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--border); }
.state-amplitude-details > summary { cursor: pointer; font-weight: 600; padding-block: 8px; }
.state-amplitude-details > p { color: var(--muted); line-height: 1.6; }
.circuit-lab .lab-panel { padding: 16px; }
.circuit-lab :is(.lab-field input, .lab-name input, .lab-stepper, .lab-chip, .lab-copy, .lab-add) { border-radius: 6px; }
.circuit-lab.is-assessment .lab-body, .circuit-lab.is-compact .lab-body { grid-template-columns: 208px minmax(0, 1fr); }
@media (max-width: 1200px) {
  .circuit-lab > .lab-bar { grid-template-columns: minmax(0, 1fr) auto; }
  .circuit-lab > .lab-bar .lab-run { grid-column: 2; }
  .circuit-lab > .lab-bar .lab-tools { grid-column: 1 / -1; grid-row: 2; }
  .circuit-lab .lab-body { grid-template-columns: 208px minmax(0, 1fr); }
  .circuit-lab .lab-side { grid-column: 2; position: static; max-height: none; }
  .circuit-lab.is-compact .lab-side { grid-column: 1 / -1; }
}
@media (max-width: 760px) {
  .circuit-lab > .lab-bar { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .circuit-lab > .lab-bar .lab-run { grid-column: 1; grid-row: 2; justify-content: center; }
  .circuit-lab > .lab-bar .lab-tools { grid-column: 1; grid-row: 3; }
  .circuit-lab .lab-run { flex-wrap: wrap; }
  .circuit-lab .lab-body, .circuit-lab.is-assessment .lab-body, .circuit-lab.is-compact .lab-body { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .circuit-lab .lab-side { grid-column: 1; }
  .circuit-lab .lab-palette { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .circuit-lab .lab-gate-help { min-height: 0; }
  .circuit-lab .lab-canvas, .circuit-lab .lab-results { padding: 12px; }
}

@media (prefers-reduced-motion: no-preference) {
  html:not([data-reduce-motion="1"]) .circuit-lab .lab-panel:not([hidden]) { animation: lab-fade .16s ease-out; }
  html:not([data-reduce-motion="1"]) .circuit-lab .lab-tile { transition: background-color .14s ease, border-color .14s ease; }
  html:not([data-reduce-motion="1"]) .circuit-lab .lab-tabs [role=tab] { transition: color .14s ease, background-color .14s ease, border-color .14s ease; }
}

.circuit-lab .state-bloch-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.circuit-lab .state-bloch-grid > div { min-width: 0; text-align: center; padding: 12px; border: 1px solid var(--border); border-radius: 6px; }
.circuit-lab .state-bloch-grid > div:only-child { grid-column: 1 / -1; }
.circuit-lab .state-bloch-grid svg { max-width: 100%; height: auto; }
.circuit-lab .state-probabilities > div, .circuit-lab .state-amplitude-grid { max-height: none; overflow: visible; }
.circuit-lab .lab-counts { table-layout: fixed; }
.circuit-lab .lab-counts th, .circuit-lab .lab-counts td { padding: 10px 4px; font-size: 14px; }
.lab-count-track { position: relative; height: 10px; margin-top: 5px; background: var(--raised); border: 1px solid var(--border); }
.lab-count-track .lab-histogram-bar { display: block; height: 100%; background: var(--green); }
.lab-count-exact { position: absolute; top: -2px; bottom: -2px; border-left: 2px dashed var(--amber); transform: translateX(-1px); }
.circuit-lab .lab-rail > .lab-tabs { margin: -4px -4px 0; flex-wrap: wrap; }
.circuit-lab .lab-rail > .lab-tabs [role=tab] { flex: 1 1 auto; min-width: 0; overflow-wrap: anywhere; }
.circuit-lab .lab-rail .lab-panel { padding: 0; }
.circuit-lab .lab-settings-grid { position: static; min-width: 0; padding: 0; box-shadow: none; border: 0; }
.circuit-lab .lab-settings-grid input { width: 100%; min-width: 0; }
.lab-challenge { padding: 20px; border: 1px solid var(--border-strong); border-radius: 8px; background: var(--panel); }
.lab-challenge h2 { margin: 0; font-size: 20px; }
.lab-challenge-content { display: grid; gap: 12px; }
.lab-challenge-select { display: grid; gap: 6px; }
.lab-challenge-select select { width: 100%; min-width: 0; }
.lab-challenge-actions, .lab-challenge-active { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.lab-challenge-active > p { flex-basis: 100%; margin: 0; }
.lab-challenge-preview, .lab-challenge-confirm { padding: 12px; background: var(--sunken); border-left: 3px solid var(--amber); }
.lab-challenge-result:empty, .lab-challenge-hint:empty { display: none; }
.lab-challenge-result { padding: 12px; border-left: 3px solid var(--green); background: var(--sunken); }
@media (max-width: 420px) {
 .circuit-lab .state-bloch-grid { grid-template-columns: minmax(0, 1fr); }
 .circuit-lab .lab-palette { grid-template-columns: minmax(0, 1fr); }
}

.circuit-lab .lab-side { max-height: none; overflow: visible; }
.circuit-lab .lab-name { margin: 0; }
.lab-challenge-preview h3 { margin: 0 0 6px; font-size: 16px; }
.lab-challenge-preview p { margin: 6px 0; }
.lab-challenge-intro { margin: 8px 0; }
.lab-challenge-availability:empty { display: none; }
.lab-challenge .lab-tabs { margin-bottom: 12px; }

.circuit-lab .lab-group:last-child .lab-tiles { grid-template-columns: repeat(auto-fit, minmax(min(100%, 4.5rem), 1fr)); }
.circuit-lab .state-bloch-grid > div { padding: 8px; }
.circuit-lab .state-bloch-grid p { margin: 6px 0; }
.circuit-lab .lab-counts th, .circuit-lab .lab-counts td { padding: 6px 4px; }
.lab-count-share { position: relative; }
.lab-count-share > span { display: block; padding-bottom: 4px; }
.lab-count-share .lab-count-track { position: absolute; left: 4px; right: 4px; bottom: 3px; height: 4px; margin: 0; }