/* Challenge-only styles: Learn is unaffected unless assembly is explicitly active. */
.edza-challenges {
  --challenge-bg: #101014;
  --challenge-panel: #19181f;
  --challenge-accent: #a17dee;
  --challenge-accent-dark: #8e6cda;
  --challenge-text: #f1edf8;
  --challenge-muted: #b4adbf;
  --challenge-border: #38313f;
  margin: 0 0 24px;
  padding: 18px 22px;
  border: 1px solid var(--challenge-border);
  border-radius: 18px;
  background: var(--challenge-bg);
  color: var(--challenge-text);
  font: inherit;
  line-height: 1.6;
  color-scheme: dark;
}

.edza-challenges[hidden],
.edza-challenges [hidden] {
  display: none !important;
}

.edza-challenges .challenge-heading {
  margin-bottom: 12px;
}

.edza-challenges .challenge-eyebrow {
  color: var(--challenge-accent);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.edza-challenges h2 {
  margin: 5px 0 8px;
  font-size: 1.45rem;
}

.edza-challenges h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
  line-height: 1.5;
}

.edza-challenges h4 {
  margin: 18px 0 8px;
  font-size: 0.95rem;
}

.edza-challenges p {
  margin: 8px 0 14px;
  max-width: 95ch;
  font-size: 0.9rem;
}

.edza-challenges .challenge-heading p,
.edza-challenges .challenge-muted {
  color: var(--challenge-muted);
}

.edza-challenges .challenge-missions,
.edza-challenges .challenge-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.edza-challenges .challenge-missions {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--challenge-border);
}

.edza-challenges .challenge-button {
  min-height: 42px;
  padding: 9px 14px;
  border: 1px solid transparent;
  border-radius: 9px;
  background: var(--challenge-accent-dark);
  color: #fff;
  font: inherit;
  font-size: 0.83rem;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  cursor: pointer;
}

.edza-challenges .challenge-button:hover:not(:disabled) {
  background: #7954c4;
}

.edza-challenges .challenge-secondary {
  border-color: var(--challenge-border);
  background: #23202b;
  color: #e1d8f0;
}

.edza-challenges .challenge-secondary:hover:not(:disabled),
.edza-challenges .challenge-missions [aria-pressed="true"] {
  border-color: var(--challenge-accent);
  background: #352847;
  color: #fff;
}

.edza-challenges button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.edza-challenges :is(button, input, select, a, summary):focus-visible {
  outline: 3px solid var(--challenge-accent);
  outline-offset: 3px;
}

.edza-challenges .challenge-content {
  padding-top: 12px;
}

.edza-challenges .challenge-progress {
  padding: 12px 15px;
  border-left: 3px solid var(--challenge-accent);
  border-radius: 0 8px 8px 0;
  background: #211b2c;
  color: #e1d3fa;
  font-variant-numeric: tabular-nums;
}

.edza-challenges .challenge-assembly,
.edza-challenges .challenge-report {
  margin: 12px 0;
  padding: 14px;
  border: 1px solid var(--challenge-border);
  border-radius: 12px;
  background: var(--challenge-panel);
}

.edza-challenges .challenge-lead-count {
  font-size: 0.9rem;
  color: #d1b7ff;
}

.edza-challenges .challenge-endpoints {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
  align-items: end;
  gap: 12px;
  margin: 16px 0;
}

.edza-challenges label {
  display: grid;
  gap: 6px;
  font-size: 0.86rem;
}

.edza-challenges :is(select, input[type="number"]) {
  box-sizing: border-box;
  width: 100%;
  min-width: 0;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid #51455f;
  border-radius: 8px;
  background: #101014;
  color: var(--challenge-text);
  font: inherit;
  font-size: 0.9rem;
}

.edza-challenges input::placeholder {
  color: var(--challenge-muted);
}

.edza-challenges .challenge-lead-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 16px 0 0;
  list-style: none;
}

.edza-challenges .challenge-lead-list:empty {
  margin: 0;
}

.edza-challenges .challenge-lead-list .challenge-button {
  min-height: 36px;
  padding: 6px 10px;
  font-size: 0.76rem;
}

.edza-challenges .challenge-feedback {
  min-height: 1.6em;
  color: #eadbff;
  overflow-wrap: anywhere;
}

.edza-challenges .challenge-prediction {
  display: grid;
  justify-items: start;
  gap: 12px;
  margin: 18px 0;
}

.edza-challenges .challenge-prediction input {
  width: min(100%, 280px);
  margin-top: 5px;
}

.edza-challenges .challenge-report > .challenge-button {
  margin: 8px 8px 0 0;
}

.edza-challenges .challenge-table-wrap {
  max-width: 100%;
  overflow-x: auto;
}

.edza-challenges table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  white-space: normal;
}

.edza-challenges caption {
  padding: 8px 0;
  text-align: left;
  color: var(--challenge-muted);
  font-size: 0.8rem;
}

.edza-challenges :is(th, td) {
  padding: 10px;
  border-bottom: 1px solid var(--challenge-border);
  text-align: left;
  font-variant-numeric: tabular-nums;
}

.edza-challenges th {
  color: #d1b7ff;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: none;
  letter-spacing: normal;
}

.edza-challenges .challenge-success {
  color: #9fe0bc;
}

.edza-challenges .challenge-warning {
  color: #f0ca8b;
}

.edza-challenges .challenge-checklist {
  padding-left: 22px;
  color: #d6cfdf;
  font-size: 0.86rem;
}

.edza-challenges .challenge-checklist li {
  margin: 8px 0;
}

.edza-challenges .challenge-quiz fieldset {
  min-width: 0;
  padding: 16px;
  margin: 16px 0;
  border: 1px solid var(--challenge-border);
  border-radius: 12px;
}

.edza-challenges .challenge-quiz legend {
  max-width: 100%;
  padding: 0 8px;
  color: #e8def5;
  font-size: 1rem;
  font-weight: 600;
}

.edza-challenges .challenge-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px;
  margin: 8px 0;
  border: 1px solid var(--challenge-border);
  border-radius: 9px;
  background: #1c1923;
  cursor: pointer;
}

.edza-challenges .challenge-option:has(input:checked) {
  border-color: var(--challenge-accent);
  background: #30253f;
}

.edza-challenges .challenge-option input {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  accent-color: var(--challenge-accent);
}

.edza-challenges .challenge-reference {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--challenge-border);
  color: var(--challenge-muted);
  font-size: 0.76rem;
}

.edza-challenges .challenge-reference a {
  color: #c5a6ff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.challenge-assembly .challenge-actions { margin-top: 10px; }
.challenge-wiring-details { margin-top: 12px; }
.challenge-wiring-details summary { color: #c5a6ff; font-size: 12px; }

.assembly-bench-toolbar {
  padding: 12px 18px;
  background: #211b2c;
  border-bottom: 1px solid #51406e;
  color: #e1d3fa;
  font-size: 12px;
}
.assembly-bench-toolbar > div { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.assembly-bench-toolbar button {
  padding: 7px 12px; border: 1px solid #71549a; border-radius: 5px;
  background: #7954c4; color: white; font: inherit; cursor: pointer;
}
.assembly-bench-toolbar p { margin-top: 8px; }

/* Independent calculation is required in Challenge, unlike the guided Learn mode. */
.challenge-mode-active #live-calculation { display: none; }
.student-calculation {
  width: 140px;
  padding: 9px 10px;
  border: 1px solid #51406e;
  border-radius: 5px;
  background: #151219;
  color: #e8e8e8;
  font: inherit;
}
.student-calculation:focus-visible { outline: 2px solid #a17dee; outline-offset: 2px; }

/* Existing leads return automatically when assembly is accepted or left. */
body.assembly-active .fixed-leads,
body.assembly-active #jockey-lead {
  display: none !important;
}

#apparatus .challenge-lead {
  fill: none;
  stroke: #b18af4;
  stroke-width: 4;
  stroke-linecap: round;
  pointer-events: none;
}

#apparatus .challenge-lead-1 {
  stroke: #68c6bf;
}

#apparatus .challenge-lead-2 {
  stroke: #e9ad77;
}

#apparatus .challenge-pin {
  cursor: pointer;
  outline: none;
  touch-action: manipulation;
}

#apparatus .challenge-pin circle {
  fill: #17121f;
  stroke: #c3a1ff;
  stroke-width: 2.5;
}

#apparatus .challenge-pin text {
  fill: #f3eaff;
  stroke: #101014;
  stroke-width: 3px;
  paint-order: stroke fill;
  font: 700 12px system-ui, sans-serif;
  pointer-events: none;
}

#apparatus .challenge-pin:hover circle,
#apparatus .challenge-pin[aria-pressed="true"] circle {
  fill: #8e6cda;
  stroke: #fff;
  stroke-width: 3;
}

#apparatus .challenge-pin:focus-visible circle {
  stroke: #fff;
  stroke-width: 5;
  stroke-dasharray: 3 2;
}

@media (max-width: 850px) {
  .edza-challenges .challenge-endpoints {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .edza-challenges .challenge-endpoints > button {
    grid-column: 1 / -1;
    justify-self: start;
  }
}

@media (max-width: 540px) {
  .edza-challenges {
    padding: 16px;
    border-radius: 12px;
  }

  .edza-challenges .challenge-missions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .edza-challenges .challenge-missions .challenge-button {
    text-align: left;
  }

  .edza-challenges .challenge-endpoints {
    grid-template-columns: minmax(0, 1fr);
  }

  .edza-challenges .challenge-endpoints > button {
    justify-self: stretch;
  }

  .edza-challenges .challenge-assembly,
  .edza-challenges .challenge-report {
    padding: 12px;
  }

  .edza-challenges .challenge-actions > button {
    flex: 1 1 45%;
  }

  .edza-challenges :is(th, td) {
    padding: 8px 6px;
    font-size: 0.76rem;
  }
}