.gc-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1rem;
  align-items: center;
}

.gc-toolbar select,
.gc-field select,
.gc-field input[type="text"] {
  font-family: var(--mono);
  font-size: 0.88rem;
  padding: 0.4rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
}

.gc-field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.gc-field label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.gc-gate-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.gc-gate {
  display: grid;
  gap: 0.45rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface2);
}

.gc-gate-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  justify-content: space-between;
}

.gc-gate-id {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.92rem;
}

.gc-gate-type {
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 0.15rem 0.45rem;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
}

.gc-pins {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.75rem;
  align-items: end;
}

.gc-pins .gc-field {
  min-width: 7rem;
}

.gc-out-badge {
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 0.15rem 0.4rem;
  border-radius: 6px;
  background: var(--ok-bg);
  color: var(--ok);
}

.gc-schematic-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: linear-gradient(180deg, #faf7f0 0%, #f0ebe1 100%);
  min-height: 220px;
}

.gc-schematic-wrap svg {
  display: block;
  min-width: 100%;
}

.gc-node-box {
  fill: var(--surface);
  stroke: var(--line);
  stroke-width: 1.5;
}
.gc-node-box.is-in {
  fill: var(--accent-soft);
  stroke: var(--accent);
}
.gc-node-box.is-out {
  fill: var(--ok-bg);
  stroke: var(--ok);
}
.gc-node-label {
  font-family: var(--mono);
  font-size: 12px;
  fill: var(--ink);
  text-anchor: middle;
  dominant-baseline: middle;
}
.gc-wire {
  fill: none;
  stroke: #6a756e;
  stroke-width: 1.6;
  stroke-linecap: round;
}
.gc-wire.is-hot {
  stroke: var(--accent);
  stroke-width: 2.2;
}

.gc-table-wrap {
  overflow: auto;
  max-height: min(50vh, 360px);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.gc-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.84rem;
}
.gc-table th,
.gc-table td {
  padding: 0.35rem 0.55rem;
  border-bottom: 1px solid var(--line);
  text-align: center;
}
.gc-table th {
  background: var(--surface2);
  position: sticky;
  top: 0;
  font-weight: 600;
}
.gc-table tr.is-probe td {
  background: var(--accent-soft);
}
.gc-table td.f1 { color: var(--ok); font-weight: 600; }
.gc-table td.f0 { color: var(--muted); }
.gc-table td.ferr { color: var(--err); }

.gc-expr {
  margin: 0;
  padding: 0.65rem 0.75rem;
  background: var(--term-bg);
  color: var(--term-fg);
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 0.86rem;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 2.4rem;
}

.gc-msg {
  margin: 0.5rem 0 0;
  font-size: 0.88rem;
  min-height: 1.2em;
}
.gc-msg.err { color: var(--err); }
.gc-msg.ok { color: var(--ok); }

.gc-hint {
  margin: 0.55rem 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.gc-chal-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.65rem;
}
.gc-chal-head h2 {
  margin: 0;
}
.gc-chal-progress {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
}
.gc-chal-catalog {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 0.75rem;
  max-height: min(42vh, 420px);
  overflow: auto;
  padding-right: 0.25rem;
}
.gc-chal-group h3 {
  margin: 0 0 0.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.gc-chal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.4rem;
}
.gc-chal-item {
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
  text-align: left;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.gc-chal-item:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.gc-chal-item.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: inset 3px 0 0 var(--accent);
}
.gc-chal-item.is-cleared .gc-chal-mark {
  color: var(--ok);
}
.gc-chal-mark {
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.4;
  color: var(--muted);
  flex-shrink: 0;
}
.gc-chal-item-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}
.gc-chal-item-title {
  font-weight: 650;
  font-size: 0.9rem;
}
.gc-chal-item-meta {
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.gc-chal-active-prompt {
  margin: 0 0 0.65rem;
  font-size: 0.92rem;
  color: var(--ink);
}

.gc-file-btn {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
}

@media (max-width: 700px) {
  .gc-gate-top { flex-direction: column; align-items: flex-start; }
}

@media print {
  .site-header,
  .site-footer,
  .eyebrow,
  .hero,
  .challenge,
  .gc-toolbar,
  .no-print {
    display: none !important;
  }
  .gc-schematic-wrap {
    break-inside: avoid;
  }
}