/* Electronic lock: supply, driver, relay and switched electromagnet. */
.circuit-panel .panel-heading { margin-bottom: 17px; }
.circuit-panel { position: relative; }
.circuit-status { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 10px; margin-bottom: 12px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 7px; background: color-mix(in srgb, var(--panel-2) 76%, transparent); box-shadow: inset 0 0 18px rgba(22,127,138,.06); }
.circuit-status__dot { width: 6px; height: 6px; flex: 0 0 auto; border-radius: 50%; background: var(--muted); }
.circuit-status__dot { box-shadow: 0 0 0 3px color-mix(in srgb, var(--muted) 20%, transparent); }
.supply-label { margin-left: auto; white-space: nowrap; color: var(--supply); font: 10px var(--mono); }
.schematic-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; background: radial-gradient(circle at 50% 15%, var(--lab-glow), transparent 42%), var(--panel-2); scrollbar-color: var(--wire) var(--panel-2); box-shadow: inset 0 0 28px rgba(20,28,22,.08); }
.diagram-toolbar { padding: 6px 8px; border: 1px solid var(--line); border-radius: 7px; background: color-mix(in srgb, var(--panel-2) 70%, transparent); }
.schematic-scroll:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.component-tooltip { position: relative; width: 100%; margin-top: 12px; padding: 16px 44px 15px 16px; border: 1px solid var(--accent); border-radius: 8px; background: var(--panel); box-shadow: 0 8px 20px rgba(0,0,0,.12); animation: tooltip-in .16s ease-out; }
.component-tooltip[hidden] { display: none; }
.component-tooltip__label { display: block; margin-bottom: 5px; color: var(--accent); font: 8px var(--mono); letter-spacing: .09em; }
.component-tooltip strong { display: block; margin-bottom: 6px; color: var(--text); font: 700 13px/1.35 var(--mono); }
.component-tooltip p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.6; }
.component-tooltip__close { position: absolute; top: 8px; right: 9px; border: 0; background: transparent; color: var(--muted); cursor: pointer; font-size: 18px; line-height: 1; }
.component-tooltip__close:hover { color: var(--text); }
@keyframes tooltip-in { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }
.schematic { display: block; width: 100%; min-width: 460px; color: var(--wire); }
.schematic-grid { opacity: .4; }
.schematic text { fill: var(--text); font: 11px var(--mono); }
.schematic .component-label { fill: var(--text); font-weight: 700; }
.schematic .schematic-muted { fill: var(--muted); font-size: 10px; }
.schematic .supply-text { fill: var(--supply); font-weight: 700; }
.wire { stroke: var(--wire); stroke-width: 1.7; fill: none; stroke-linejoin: round; stroke-linecap: round; transition: stroke .15s; }
.wire circle:not(.transistor circle) { fill: var(--panel-2); }
.supply { stroke: var(--supply); }
.ground { stroke: var(--wire); }
.controller-body, .keypad-input rect { fill: var(--panel); stroke: var(--wire); stroke-width: 1.5; }
.controller [data-code-cell] rect { fill: var(--panel-2); stroke: var(--wire); }
.controller [data-code-cell] text { font-size: 10px; fill: var(--muted); }
.controller [data-code-cell].is-filled rect { fill: var(--accent); stroke: var(--accent); }
.controller [data-code-cell].is-filled text { fill: var(--on-accent); font-weight: 700; }
.schematic.has-input .controller-body { stroke: var(--accent); fill: var(--accent-soft); }
.schematic.is-receiving :is(.input-signal, .keypad-input rect) { stroke: var(--signal); }
.schematic.is-receiving .keypad-input text { fill: var(--signal); }
.schematic.is-receiving .input-signal { stroke-width: 3; }
.legend-dot--input { background: var(--signal); }
.close-lock-button { display: block; width: 100%; margin-top: 14px; min-height: 44px; }
.lock-stage { height: auto; aspect-ratio: 2 / 1; }
.mechanism-cutaway { display: block; width: 100%; position: relative; color: var(--wire); }
.mechanism-frame { fill: var(--panel); stroke: var(--line); }
.mechanism-receiver, .mechanism-bolt rect { fill: var(--metal); stroke: var(--wire); }
.mechanism-slot { fill: var(--panel-2); }
.mechanism-bolt { transition: transform .55s cubic-bezier(.2,.8,.2,1); }
.mechanism-bolt path { stroke: var(--wire); stroke-width: 4; }
.mechanism-coil { fill: var(--panel); stroke: var(--wire); }
.mechanism-turns { opacity: .65; }
.mechanism-callouts path, .mechanism-spring { fill: none; stroke: var(--wire); stroke-width: 1.4; }
.mechanism-callouts text { fill: var(--muted); font: 11px var(--sans); }
.mechanism-force { opacity: 0; stroke: var(--accent); fill: none; stroke-width: 2; }
text.mechanism-force { stroke: none; fill: var(--accent); font: 10px var(--sans); }
.lock-stage.is-open .mechanism-bolt { transform: translateX(-65px); }
.lock-stage.is-open .mechanism-coil { stroke: var(--accent); fill: var(--accent-soft); }
.lock-stage.is-open .mechanism-turns { color: var(--accent); }
.lock-stage.is-open .mechanism-force { opacity: 1; }
.mechanism-explanation { color: var(--muted); font-size: 10px; line-height: 1.8; margin: 12px 0 0; }
button:disabled { cursor: not-allowed; }
.close-lock-button:disabled { opacity: 1; background: var(--panel-2); color: var(--muted); }
.text-button:disabled, .keypad button:disabled:not(.keypad__disabled), .code-input-wrap :disabled, #backspaceButton:disabled { opacity: .4; }
.mechanical-link { fill: none; stroke: var(--wire); stroke-width: 1; stroke-dasharray: 4 5; }
.current-flow { fill: none; stroke: var(--accent); stroke-width: 3; stroke-dasharray: 3 13; stroke-linecap: round; opacity: 0; }
.schematic[data-state="open"] .current-flow { opacity: 1; animation: circuit-current 1s linear infinite; }
.schematic[data-state="open"] :is(.relay-path, .load-path, .transistor, .control-path, .contact) { stroke: var(--accent); }
.schematic[data-state="open"] .controller-body { stroke: var(--accent); fill: var(--accent-soft); }
.schematic[data-state="error"] .controller-body { stroke: var(--danger); fill: var(--danger-soft); }
.circuit-readings { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 12px 0; }
.circuit-readings > div { padding: 12px 0; }
.circuit-readings span { display: block; color: var(--muted); font: 8px var(--mono); letter-spacing: .04em; }
.circuit-readings strong { display: block; margin-top: 5px; color: var(--text); font: 12px var(--mono); }
.circuit-panel:has([data-state="open"]) .circuit-readings strong { color: var(--accent); }
.circuit-panel:has([data-state="open"]) .circuit-status__dot { background: var(--accent);  }
.circuit-panel:has([data-state="error"]) .circuit-status__dot { background: var(--danger); }
.legend-dot--supply { background: var(--supply); }
.circuit-panel .legend { flex-wrap: wrap; gap: 8px 16px; }
.schematic-note { margin: 12px 0 0; color: var(--muted); font-size: 10px; line-height: 1.6; }
.schematic-scroll-hint { display: none; margin: 8px 0 0; color: var(--muted); font-size: 10px; }
.extras-button { display: inline-grid; place-items: center; font-size: 23px; line-height: 1; flex: 0 0 34px; }
.extras-modal { width: min(560px, calc(100% - 24px)); max-height: calc(100dvh - 32px); overflow-y: auto; }
.extras-games { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 22px 0; }
.extras-games button { display: grid; justify-items: center; gap: 10px; padding: 16px 8px; }
.extras-games button > span { color: var(--accent); font: 24px var(--mono); }
.extras-modal .radio-panel { margin: 0; padding: 16px; gap: 16px; box-shadow: none; }
.extras-modal .radio-controls { flex: 1 1 100%; flex-wrap: wrap; }
.extras-modal .radio-controls select { max-width: none; flex: 1; }
.extras-modal .radio-volume { flex-basis: 100%; padding-top: 6px; }
.extras-modal .radio-panel__intro .panel-kicker { font-size: 9px; color: var(--accent); margin: 0; }
.extras-modal .radio-panel__signal { animation: none; color: var(--muted); text-shadow: none; }
.extras-modal .radio-panel:has(audio[data-playing="true"]) .radio-panel__signal { color: var(--accent); }
.extras-modal .extras-note { margin: 12px 0 0; color: var(--muted); font-size: 11px; }
/* Detailed original circuit, inspector and learning controls. */
.app-shell { width: min(1520px, calc(100% - 64px)); }
.workspace { grid-template-columns: minmax(270px, .37fr) minmax(0, 1fr); }
.workbench-column { padding: 26px; }
.scheme-heading-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 14px; }
.scheme-intro { max-width: 640px; margin: -3px 0 18px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.diagram-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.view-switch, .zoom-tools { display: flex; align-items: center; gap: 3px; }
.view-switch { background: var(--panel-2); padding: 3px; border-radius: 7px; }
.view-switch button, .zoom-tools button, .node-selector button { min-height: 34px; padding: 7px 10px; border: 1px solid transparent; background: transparent; color: var(--muted); border-radius: 5px; font-size: 10px; cursor: pointer; }
.view-switch [aria-pressed="true"] { color: var(--text); background: var(--panel); border-color: var(--line); }
.zoom-tools button { border-color: var(--line); font: 12px var(--mono); }
.zoom-tools button:disabled { opacity: .4; }
.zoom-tools button:hover:not(:disabled), .node-selector button:hover { background: var(--accent-soft); }
.zoom-tools[hidden], #diagramHost[hidden], #originalCircuit[hidden] { display: none; }
.schematic-scroll { max-height: 650px; overflow: auto; background: var(--panel-2); }
#diagramHost { min-width: 900px; }
.schematic { width: 100%; min-width: 0; color: var(--wire); }
.schematic .drawing { fill: none; stroke: var(--wire); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.schematic text { fill: var(--text); stroke: none; font: 12px var(--mono); }
.schematic .schematic-muted { font-size: 10px; fill: var(--muted); }
.schematic .zone-label { fill: var(--muted); font-size: 11px; }
.schematic .patch-label { font-size: 9px; fill: var(--muted); }
.schematic .mains-label { font-size: 10px; text-anchor: middle; }
.schematic .junction { fill: var(--wire); stroke: none; }
.circuit-part { cursor: pointer; }
.circuit-part rect, .circuit-part circle { fill: var(--panel-2); }
.circuit-part:hover, .circuit-part:focus, .circuit-part.is-selected { stroke: var(--accent); outline: none; }
.circuit-part:hover text, .circuit-part:focus text, .circuit-part.is-selected text { fill: var(--accent); }
.circuit-part.is-selected { stroke: var(--signal); }
.circuit-part.is-selected text { fill: var(--signal); }
.circuit-part:focus-visible { filter: drop-shadow(0 0 2px var(--accent)); }
.schematic .memory-device.is-conducting { stroke: var(--accent); stroke-width: 3; }
.schematic .memory-device.is-conducting text { fill: var(--accent); }
.schematic[data-state="error"] :is(.memory-device, [data-part="VT1"], [data-part="R19"], [data-part="C3"]) { stroke: var(--danger); }
.schematic[data-state="error"] .memory-device text { fill: var(--danger); }
.schematic[data-state="open"] :is([data-part="YA1"], [data-part="HL1"], [data-part="VT1"], [data-part="VT3"], [data-part="VT4"], [data-part="C1"]) { stroke: var(--accent); }
.schematic[data-state="open"] [data-part="HL1"] circle { fill: var(--accent-soft); }
.signal-overlay { stroke: var(--signal); stroke-width: 3; fill: none; opacity: 0; }
.schematic.is-receiving .signal-overlay { opacity: 1; }
.schematic .key-active { stroke: var(--signal); stroke-width: 3; }
.schematic .current-flow { pointer-events: none; }
.diagram-caption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; padding: 10px 0 16px; color: var(--muted); font: 9px/1.6 var(--mono); }
#keypadSignal { color: var(--signal); }
.thyristor-stages { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 0 0 16px; }
.thyristor-stages > div { display: grid; grid-template-columns: 1fr auto; gap: 6px; padding: 12px; background: linear-gradient(145deg, color-mix(in srgb, var(--panel-2) 88%, var(--accent-soft)), var(--panel-2)); border: 1px solid var(--line); border-radius: 8px; box-shadow: inset 0 1px rgba(255,255,255,.08); }
.thyristor-stages span { grid-column: 1 / -1; color: var(--muted); font: 9px var(--mono); }
.thyristor-stages strong { font: 13px var(--mono); }
.thyristor-stages small { font: 9px/1.8 var(--mono); color: var(--muted); }
.thyristor-stages .is-conducting { background: var(--accent-soft); border-color: var(--accent); }
.thyristor-stages .is-conducting :is(strong, small) { color: var(--accent); }
.circuit-readings { margin: 4px 0 10px; }
.circuit-readings > div { min-width: 0; }
.simulation-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.hold-option { display: flex; align-items: center; gap: 8px; flex-basis: 100%; margin: 5px 0 8px; font-size: 11px; color: var(--muted); cursor: pointer; }
.hold-option input { width: 15px; height: 15px; accent-color: var(--accent); }
.node-selector { display: flex; flex-wrap: wrap; gap: 5px; margin: 24px 0 10px; }
.node-selector button { border-color: var(--line); }
.node-selector [aria-pressed="true"] { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.node-selector [aria-pressed="true"] { box-shadow: inset 0 -2px var(--accent), 0 0 12px var(--lab-glow); }
.component-detail { padding: 22px; border: 1px solid color-mix(in srgb, var(--accent) 26%, var(--line)); border-radius: 10px; background: linear-gradient(145deg, color-mix(in srgb, var(--panel) 92%, var(--accent-soft)), var(--panel)); }
.component-detail-disclosure { margin-top: 14px; }
.component-detail-disclosure > summary { display: flex; align-items: baseline; justify-content: space-between; gap: 14px; padding: 14px 0; border-block: 1px solid var(--line); color: var(--text); cursor: pointer; font: 600 12px var(--sans); list-style: none; }
.component-detail-disclosure > summary::-webkit-details-marker { display: none; }
.component-detail-disclosure > summary::before { content: "＋"; width: 18px; color: var(--accent); font: 16px var(--mono); }
.component-detail-disclosure[open] > summary::before { content: "−"; }
.component-detail-disclosure > summary span { margin-left: auto; color: var(--muted); font: 9px var(--mono); }
.component-detail-disclosure > summary:hover { color: var(--accent); }
.component-detail-disclosure .component-detail { margin-top: 12px; }
.component-detail h3 { font-size: 16px; font-weight: 600; line-height: 1.6; margin: 7px 0; }
.component-detail p { margin-bottom: 12px; color: var(--muted); font-size: 12px; line-height: 1.85; }
.component-detail .detail-refs { font: 10px/1.8 var(--mono); color: var(--accent); }
.detail-route { padding: 13px 15px; background: var(--panel-2); border-radius: 6px; }
.detail-route > span { color: var(--muted); font: 8px var(--mono); letter-spacing: .06em; }
.detail-route p { margin: 5px 0 0; }
.component-detail .detail-state { border-left: 2px solid var(--accent); padding-left: 12px; margin: 14px 0 0; color: var(--text); }
.component-overview { display: grid; gap: 10px; margin-top: 14px; }
.component-overview p { margin: 0; }
.circuit-disclosure { border-bottom: 1px solid var(--line); }
.circuit-disclosure summary { cursor: pointer; padding: 18px 0; font-size: 12px; font-weight: 600; }
.operation-steps { padding-left: 24px; margin: 0 0 20px; }
.operation-steps li { color: var(--muted); padding: 0 0 12px 5px; font-size: 12px; line-height: 1.9; }
.operation-steps b { color: var(--text); }
.component-table-wrap { overflow: auto; margin-bottom: 18px; }
.component-table { border-collapse: collapse; width: 100%; font-size: 11px; text-align: left; }
.component-table th, .component-table td { border-bottom: 1px solid var(--line); padding: 10px 8px; font-weight: 400; line-height: 1.7; }
.component-table thead { color: var(--muted); }
.component-table button { border: 0; padding: 5px; background: var(--accent-soft); color: var(--accent); font: 10px var(--mono); cursor: pointer; border-radius: 4px; }
.schematic-source { color: var(--muted); font-size: 10px; line-height: 1.8; margin: 12px 0 0; }
.schematic-source a { color: var(--muted); text-underline-offset: 3px; }
.circuit-modal { position: fixed; inset: 0; width: calc(100vw - 36px); max-width: 1600px; height: calc(100dvh - 36px); max-height: none; padding: 30px; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); color: var(--text); overflow: auto; }
.circuit-modal::backdrop { background: #11171390; backdrop-filter: blur(4px); }
.circuit-modal .circuit-panel { max-width: 1400px; margin: 0 auto; }
.circuit-modal .panel-heading { position: sticky; top: -1px; padding: 12px 0; background: var(--panel); z-index: 2; }
.circuit-modal .schematic-scroll { max-height: 72vh; }
#finishPulse:disabled { display: none; }
#collapseCircuit, .circuit-modal #expandCircuit { display: none; }
.circuit-modal #collapseCircuit { display: inline-block; }
.close-lock-button { display: block; width: 100%; margin-top: 14px; min-height: 44px; }
@media (max-width: 1100px) { .app-shell { width: calc(100% - 40px); } .workbench-column { padding: 20px; } .workspace { grid-template-columns: 280px minmax(0, 1fr); } .thyristor-stages > div { padding: 9px; } .thyristor-stages small { grid-column: 1 / -1; } }
@media (max-width: 800px) { .workspace { grid-template-columns: 1fr; } .workbench-column:first-child { display: grid; grid-template-columns: 1fr 1fr; align-items: start; gap: 24px; } .workbench-column:first-child .panel + .panel { padding-top: 0; border: 0; } .circuit-modal { padding: 20px; } }
@media (max-width: 540px) { .app-shell { width: calc(100% - 24px); } .workbench-column:first-child { display: flex; } .workbench-column:first-child .panel + .panel { padding-top: 24px; border-top: 1px solid var(--line); } .workbench-column { padding: 18px; } .thyristor-stages { gap: 5px; } .thyristor-stages > div { padding: 8px; } .thyristor-stages span { font-size: 8px; } .component-detail { padding: 16px; } .view-switch button { padding-inline: 7px; } .zoom-tools button { padding-inline: 8px; } .circuit-modal { padding: 16px; width: calc(100vw - 16px); height: calc(100dvh - 16px); } .scheme-heading-actions { gap: 10px; } .circuit-readings span { font-size: 7px; } .circuit-readings strong { font-size: 10px; } }
@keyframes circuit-current { to { stroke-dashoffset: -32; } }
@media (max-width: 800px) { .extras-button { display: inline-grid; } }
@media (max-width: 540px) { .schematic-scroll-hint { display: block; } }
@media (max-width: 440px) { .extras-modal { padding: 20px; } .circuit-readings > div { padding: 9px 6px; } .circuit-status { flex-wrap: wrap; } .supply-label { display: none; } }
@media (prefers-reduced-motion: reduce) { .schematic[data-state="open"] .current-flow { animation: none; } .armature, .beam { transition: none; } }

/* The working schematic consists only of SVG paths and component symbols. */
.diagram-format { display: flex; align-items: center; gap: 8px; color: var(--muted); font: 9px/1.6 var(--mono); }
.diagram-format > span { padding: 3px 5px; border: 1px solid var(--line); border-radius: 3px; color: var(--accent); }
.svg-download { display: inline-flex; align-items: center; min-height: 34px; padding: 6px 8px; border: 1px solid var(--line); border-radius: 5px; color: var(--accent); font: 10px var(--mono); text-decoration: none; }
#diagramHost { min-width: 1050px; }
.vector-schematic .part-hitbox { fill: transparent; stroke: none; }
.vector-schematic .circuit-part:hover .part-hitbox, .vector-schematic .circuit-part:focus .part-hitbox { fill: var(--accent-soft); opacity: .55; }
.vector-schematic .circuit-part.is-selected .part-symbol { stroke: var(--signal); }
.vector-schematic .circuit-part.is-selected .component-label { fill: var(--signal); }
.vector-schematic .is-biased .part-symbol { stroke: var(--supply); }
.vector-schematic .is-biased .arrow-fill { fill: var(--supply); }
.vector-schematic .is-on .part-symbol, .vector-schematic .is-conducting .part-symbol { stroke: var(--accent); stroke-width: 2.5; }
.vector-schematic .is-on .arrow-fill { fill: var(--accent); }
.vector-schematic .is-on .component-label, .vector-schematic .is-conducting .component-label { fill: var(--accent); }
.vector-schematic .memory-device.is-conducting .part-symbol { stroke: var(--accent); stroke-width: 2.5; }
.vector-schematic .memory-device.is-conducting .component-label { fill: var(--accent); }
.vector-schematic .net.is-conducting { stroke: var(--accent); stroke-width: 2.3; }
.vector-schematic .logic-supply-net { stroke: var(--supply); }
.vector-schematic .exit-current { display: none; }
.vector-schematic[data-exit="true"] .exit-current { display: inline; }
.vector-schematic[data-exit="true"] .code-current { display: none; }
.vector-schematic[data-state="open"] [data-part="HL1"] .lamp-bulb { fill: var(--accent-soft); stroke: var(--accent); }
.vector-schematic[data-state="open"] [data-part="YA1"] .part-symbol, .vector-schematic[data-state="open"] [data-part="HL1"] .part-symbol { stroke: var(--accent); stroke-width: 2.5; }
.vector-schematic[data-state="open"][data-exit="false"] [data-part="C1"] .part-symbol { stroke: var(--accent); animation: capacitor-charge 1.5s linear both; }
.vector-schematic.is-held[data-state="open"] [data-part="C1"] .part-symbol { animation: none; }
.vector-schematic[data-state="error"] :is(.memory-device,[data-part="VT1"],[data-part="C3"],[data-part="R19"]) .part-symbol { stroke: var(--danger); }
.vector-schematic[data-state="error"] .fault-flow { opacity: 1; }
.vector-schematic.is-releasing [data-part="VT3"] .part-symbol { stroke: var(--accent); }
.vector-schematic.is-releasing :is([data-part="VT1"],[data-part="VT4"]) .part-symbol { stroke: var(--wire); }
.vector-schematic.is-flyback .flyback-flow { opacity: 1; animation: circuit-current .7s linear infinite; }
.vector-schematic.is-receiving .key-active .part-symbol, .vector-schematic.is-receiving .key-active { stroke: var(--signal); stroke-width: 2.5; }
@keyframes capacitor-charge { from { opacity: .35; } to { opacity: 1; } }
@media (max-width: 540px) { .diagram-format { max-width: 135px; font-size: 8px; } .svg-download { padding-inline: 5px; } }