.topic-graph {
  --circuit-grid-pitch: 10px;
  --circuit-grid-dot-color: #74746e;
  --circuit-grid-ring-color: #d2d0c5;
  /* Circuit design parameters. Keep relation semantics in the authoring
     operators and tune their appearance here. A line remains solid unless a
     future schematic profile explicitly supplies a dash pattern. */
  --circuit-copper-color: #b7652d;
  --circuit-survey-color: #165d2d;
  --circuit-survey-highlight: #c9e95a;
  --circuit-survey-width: 8px;
  --circuit-survey-highlight-width: 2px;
  --circuit-details-color: #8f2420;
  --circuit-details-highlight: #ff9a32;
  --circuit-details-width: 7px;
  --circuit-details-highlight-width: 2px;
  --circuit-detour-color: #174f91;
  --circuit-detour-highlight: #4de3f2;
  --circuit-detour-width: 4px;
  --circuit-detour-highlight-width: 1px;
  --circuit-rant-color: #8b6500;
  --circuit-rant-highlight: #ffe46b;
  --circuit-rant-width: 7px;
  --circuit-rant-highlight-width: 2px;
  position: relative;
  max-width: 100%;
  margin: 1.5rem 0;
  overflow-x: auto;
  border: 1px solid #b9b6aa;
  border-radius: 0.65rem;
  background-color: #f4f2e9;
  box-shadow: inset 0 1px #fff, inset 0 -1px rgba(62, 59, 48, 0.18);
}
.topic-graph__canvas {
  position: relative;
  min-width: 100%;
  background-color: #f4f2e9;
  background-image: radial-gradient(circle at center, var(--circuit-grid-dot-color) 0 2px, var(--circuit-grid-ring-color) 2.2px 3.3px, transparent 3.5px);
  background-position: 0 0;
  background-size: var(--circuit-grid-pitch) var(--circuit-grid-pitch);
}
.topic-graph--homepage-navigator {
  height: clamp(22rem, 55vw, 34rem);
  min-height: 0;
  overflow: hidden;
  background: #d7d2c3;
}
.topic-graph__homepage-frame {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #d7d2c3;
}
.topic-graph__trench {
  position: absolute;
  z-index: 0;
  left: 0;
  right: 0;
  height: 10px;
  background: linear-gradient(to bottom,
    #d7d3c5 0,
    #aaa79c 2px,
    #666761 4px,
    #565853 6px,
    #aaa79c 8px,
    #eeeadc 10px);
  box-shadow: inset 0 1px rgba(255,255,255,.72), inset 0 -1px rgba(67,65,58,.28);
}
.topic-graph__wires { position: absolute; z-index: 3; top: 0; left: 0; overflow: visible; pointer-events: none; }
.topic-graph__parts { position: absolute; z-index: 1; inset: 0; pointer-events: none; }
.topic-graph-part {
  position: absolute;
  display: block;
  box-sizing: border-box;
}
.topic-graph-part::before {
  position: absolute;
  content: "";
  background: #b7652d;
  box-shadow: 0 0 0 1px rgba(93,45,20,.22);
}
.topic-graph-part--horizontal { width: 40px; height: 14px; transform: translateY(-7px); }
.topic-graph-part--vertical { width: 14px; height: 40px; transform: translateX(-7px); }
.topic-graph-part--horizontal::before { top: 6px; left: 0; width: 40px; height: 2px; }
.topic-graph-part--vertical::before { top: 0; left: 6px; width: 2px; height: 40px; }
.topic-graph-part::after {
  position: absolute;
  z-index: 1;
  box-sizing: border-box;
  content: "";
}
.topic-graph-part--resistor.topic-graph-part--horizontal::after {
  top: 1px;
  left: 10px;
  width: 20px;
  height: 12px;
  border: 1px solid #76582c;
  border-radius: 6px;
}
.topic-graph-part--resistor.topic-graph-part--vertical::after {
  top: 10px;
  left: 1px;
  width: 12px;
  height: 20px;
  border: 1px solid #76582c;
  border-radius: 6px;
}
.topic-graph-part--resistor.topic-graph-part--horizontal.topic-graph-part--red-black-green::after { background: linear-gradient(90deg, #d7b77c 0 18%, #b82020 18% 27%, #d7b77c 27% 43%, #171717 43% 52%, #d7b77c 52% 68%, #21883b 68% 77%, #d7b77c 77%); }
.topic-graph-part--resistor.topic-graph-part--horizontal.topic-graph-part--green-red-black::after { background: linear-gradient(90deg, #d7b77c 0 18%, #21883b 18% 27%, #d7b77c 27% 43%, #b82020 43% 52%, #d7b77c 52% 68%, #171717 68% 77%, #d7b77c 77%); }
.topic-graph-part--resistor.topic-graph-part--horizontal.topic-graph-part--black-green-red::after { background: linear-gradient(90deg, #d7b77c 0 18%, #171717 18% 27%, #d7b77c 27% 43%, #21883b 43% 52%, #d7b77c 52% 68%, #b82020 68% 77%, #d7b77c 77%); }
.topic-graph-part--resistor.topic-graph-part--vertical.topic-graph-part--red-black-green::after { background: linear-gradient(#d7b77c 0 18%, #b82020 18% 27%, #d7b77c 27% 43%, #171717 43% 52%, #d7b77c 52% 68%, #21883b 68% 77%, #d7b77c 77%); }
.topic-graph-part--resistor.topic-graph-part--vertical.topic-graph-part--green-red-black::after { background: linear-gradient(#d7b77c 0 18%, #21883b 18% 27%, #d7b77c 27% 43%, #b82020 43% 52%, #d7b77c 52% 68%, #171717 68% 77%, #d7b77c 77%); }
.topic-graph-part--resistor.topic-graph-part--vertical.topic-graph-part--black-green-red::after { background: linear-gradient(#d7b77c 0 18%, #171717 18% 27%, #d7b77c 27% 43%, #21883b 43% 52%, #d7b77c 52% 68%, #b82020 68% 77%, #d7b77c 77%); }
.topic-graph-part--diode.topic-graph-part--horizontal::after {
  top: 2px;
  left: 11px;
  width: 18px;
  height: 10px;
  border: 1px solid #202b2a;
  border-radius: 4px;
  background: linear-gradient(90deg, #182726 0 68%, #d7d8cf 68% 80%, #172321 80%);
}
.topic-graph-part--diode.topic-graph-part--vertical::after {
  top: 11px;
  left: 2px;
  width: 10px;
  height: 18px;
  border: 1px solid #202b2a;
  border-radius: 4px;
  background: linear-gradient(#182726 0 68%, #d7d8cf 68% 80%, #172321 80%);
}
.topic-graph-wire { fill: none; stroke-linejoin: round; }
/* Copper remains hidden under the wide jacket except at its deliberately bare
   ends; this avoids a copper halo along the routed contour. */
.topic-graph-wire--copper { stroke: var(--circuit-copper-color); stroke-width: 4; stroke-linecap: round; }
.topic-graph-wire--jacket,
.topic-graph-wire--highlight { stroke-linecap: butt; }
.topic-graph-wire--jacket.topic-graph-wire--survey { stroke: var(--circuit-survey-color); stroke-width: var(--circuit-survey-width); }
.topic-graph-wire--jacket.topic-graph-wire--details { stroke: var(--circuit-details-color); stroke-width: var(--circuit-details-width); }
.topic-graph-wire--jacket.topic-graph-wire--detour { stroke: var(--circuit-detour-color); stroke-width: var(--circuit-detour-width); }
.topic-graph-wire--jacket.topic-graph-wire--rant { stroke: var(--circuit-rant-color); stroke-width: var(--circuit-rant-width); }
.topic-graph-wire--highlight.topic-graph-wire--survey { stroke: var(--circuit-survey-highlight); stroke-width: var(--circuit-survey-highlight-width); }
.topic-graph-wire--highlight.topic-graph-wire--details { stroke: var(--circuit-details-highlight); stroke-width: var(--circuit-details-highlight-width); }
.topic-graph-wire--highlight.topic-graph-wire--detour { stroke: var(--circuit-detour-highlight); stroke-width: var(--circuit-detour-highlight-width); }
.topic-graph-wire--highlight.topic-graph-wire--rant { stroke: var(--circuit-rant-highlight); stroke-width: var(--circuit-rant-highlight-width); }
.topic-graph-arrow.topic-graph-wire--survey { fill: var(--circuit-survey-color); }
.topic-graph-arrow.topic-graph-wire--details { fill: var(--circuit-details-color); }
.topic-graph-arrow.topic-graph-wire--detour { fill: var(--circuit-detour-color); }
.topic-graph-arrow.topic-graph-wire--rant { fill: var(--circuit-rant-color); }

.topic-graph-node {
  position: absolute;
  z-index: 2;
  box-sizing: border-box;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: center;
  gap: 0.55rem;
  width: 170px;
  min-height: 80px;
  padding: 0.7rem 0.75rem;
  color: #fff9dc;
  text-decoration: none;
  border: 2px solid #343a37;
  border-radius: 0.55rem;
  background: linear-gradient(145deg, #29312e, #111714 62%, #303a35);
  box-shadow: inset 0 1px rgba(255,255,255,.18), 0 3px 7px rgba(42,35,24,.32);
}
.topic-graph-node__pin {
  position: absolute;
  z-index: 0;
  width: 8px;
  height: 10px;
  transform: translateX(-50%);
  background: linear-gradient(to right, #5f5c53, #a9a597 48%, #706c61);
}
.topic-graph-node__pin--top { top: -12px; }
.topic-graph-node__pin--bottom { bottom: -12px; }
.topic-graph-node:hover,
.topic-graph-node:focus-visible {
  color: #fff;
  filter: brightness(1.16);
  box-shadow: inset 0 1px rgba(255,255,255,.26), 0 0 12px rgba(164,105,43,.68);
  outline: 2px solid #8a531f;
  outline-offset: 3px;
}
.topic-graph-node__badge {
  width: 38px;
  height: 38px;
  margin: 0;
  color: #cbc8b6;
  font-size: 1.55rem;
  border: 2px solid #747469;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 32%, #454b46 0 12%, #242a27 45%, #101512 100%);
  box-shadow: inset 0 1px 2px rgba(255,255,255,.16), inset 0 -2px 3px rgba(0,0,0,.55);
  transition: color .15s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.topic-graph-node:hover .topic-graph-node__badge,
.topic-graph-node:focus-visible .topic-graph-node__badge {
  color: #3c3100;
  border-color: #e2b91e;
  background: radial-gradient(circle at 35% 30%, #fffbd0 0 10%, #ffe761 24%, #f1c514 58%, #a96d00 100%);
  box-shadow: inset 0 1px 2px rgba(255,255,255,.9), inset 0 -2px 3px rgba(110,65,0,.32), 0 0 7px #ffe35a, 0 0 14px rgba(255,208,32,.78);
}
.topic-graph-node--active .topic-graph-node__badge,
.topic-graph-node__badge[data-led="on"],
.topic-graph-node--active:hover .topic-graph-node__badge,
.topic-graph-node:hover .topic-graph-node__badge[data-led="on"],
.topic-graph-node--active:focus-visible .topic-graph-node__badge {
  color: #123519;
  border-color: #57c96e;
  background: radial-gradient(circle at 35% 30%, #eaffdf 0 9%, #8dff91 23%, #32c858 57%, #087329 100%);
  box-shadow: inset 0 1px 2px rgba(255,255,255,.86), inset 0 -2px 3px rgba(0,72,24,.38), 0 0 7px #65ef7d, 0 0 15px rgba(40,215,83,.78);
}
.topic-graph-node__title { font: 700 0.82rem/1.18 "Courier New", ui-monospace, monospace; }
.topic-graph-node__title mjx-container { max-width:100%; margin:0 !important; color:inherit !important; }
.topic-graph--error { padding: 0.85rem 1rem; color: #7d1f1f; background: #fff3f1; }

@media (max-width: 600px) {
  .topic-graph-node { width: 170px; grid-template-columns: 34px minmax(0,1fr); }
  .topic-graph-node__badge { width: 32px; height: 32px; font-size: 1.25rem; }
}
@media (prefers-reduced-motion: reduce) {
  .topic-graph-node, .topic-graph-node__badge { transition: none; }
}
@media (forced-colors: active) {
  .topic-graph { border-color: CanvasText; background: Canvas; }
  .topic-graph__trench { background: Canvas; border-block: 1px solid CanvasText; box-shadow: none; }
  .topic-graph-node { color: LinkText; background: Canvas; border-color: CanvasText; }
  .topic-graph-node__badge { color: CanvasText; background: Canvas; border-color: CanvasText; box-shadow: none; }
  .topic-graph-node:hover .topic-graph-node__badge,
  .topic-graph-node:focus-visible .topic-graph-node__badge { color: HighlightText; background: Highlight; border-color: Highlight; box-shadow: none; }
  .topic-graph-node--active .topic-graph-node__badge,
  .topic-graph-node__badge[data-led="on"] { color: HighlightText; background: Highlight; border-color: Highlight; }
  .topic-graph-wire--copper, .topic-graph-wire--jacket, .topic-graph-wire--highlight { stroke: CanvasText; }
  .topic-graph-part::before,
  .topic-graph-part::after { background: Canvas; border: 1px solid CanvasText; box-shadow: none; }
}