.challenge-main {
  --challenge-accent: #74d6a4;
  --challenge-accent-strong: #173e31;
  --challenge-target: #f1c66d;
  --challenge-input: #8398ad;
  width: min(1480px, 100%);
  box-sizing: border-box;
  margin: 0 auto;
  padding: 24px 24px 72px;
  color: var(--ui-text);
}
.challenge-main [hidden] {
  display: none !important;
}
.challenge-main :where(h1, h2, h3, p, dl, dd) {
  margin: 0;
}
.challenge-main :where(button, .challenge-button) {
  min-height: 38px;
  padding: 8px 13px;
  border: 1px solid var(--ui-line-strong);
  border-radius: 7px;
  background: var(--ui-surface);
  color: var(--ui-text);
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  white-space: nowrap;
}
.challenge-main :where(button, .challenge-button):hover {
  border-color: var(--challenge-accent);
  background: color-mix(in srgb, var(--challenge-accent) 10%, var(--ui-surface));
}
.challenge-main :where(button, .challenge-button):active {
  transform: translateY(1px);
}
.challenge-main button:disabled {
  opacity: 0.42;
  cursor: not-allowed;
  transform: none;
}
.challenge-main button.is-primary {
  color: #10251e;
  border-color: var(--challenge-accent);
  background: var(--challenge-accent);
  font-weight: 700;
}
.challenge-main :where(input, textarea, select) {
  width: 100%;
  padding: 8px 9px;
  border: 1px solid var(--ui-line-strong);
  border-radius: 6px;
  background: var(--ui-page);
  color: var(--ui-text);
  font: inherit;
}
.challenge-main :where(button, input, textarea, select, a):focus-visible {
  outline: 2px solid var(--challenge-accent);
  outline-offset: 2px;
}
.challenge-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 22px;
}
.challenge-header h1 {
  max-width: 18ch;
  font-size: clamp(1.65rem, 2.5vw, 2.35rem);
  line-height: 1.18;
  letter-spacing: -0.03em;
}
.challenge-header > div:first-child > p:last-child {
  margin-top: 8px;
  color: var(--ui-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}
.challenge-kicker {
  margin-bottom: 5px !important;
  color: var(--challenge-accent);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}
.challenge-header-actions,
.challenge-run-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.challenge-status {
  min-height: 0;
  margin-bottom: 12px !important;
  color: var(--ui-muted);
  font-size: 0.82rem;
}
.challenge-status.is-error {
  color: var(--ui-danger, #d77c74);
}
.challenge-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}
.challenge-levels,
.challenge-ranking,
.challenge-workbench {
  border: 1px solid var(--ui-line);
  border-radius: 10px;
  background: var(--ui-surface);
  overflow: hidden;
}
.challenge-levels,
.challenge-ranking {
  padding: 15px;
}
.challenge-levels {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
}
.challenge-levels .challenge-side-heading {
  margin-bottom: 0;
}
.challenge-side-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 13px;
}
.challenge-side-heading h2 {
  font-size: 0.94rem;
}
.challenge-side-heading span {
  color: var(--ui-muted);
  font-size: 0.68rem;
}
.challenge-level-list {
  display: flex;
  gap: 6px;
  min-width: 0;
  overflow-x: auto;
  padding: 1px 2px 4px;
  scrollbar-width: thin;
}
.challenge-level {
  flex: 0 0 min(210px, 72vw);
  text-align: left;
  justify-content: flex-start !important;
  padding: 10px !important;
  min-height: 0 !important;
}
.challenge-level > span {
  display: grid;
  gap: 3px;
}
.challenge-level strong {
  font-size: 0.78rem;
}
.challenge-level small {
  color: var(--ui-muted);
  font-size: 0.66rem;
}
.challenge-level.is-active {
  color: var(--challenge-accent);
  border-color: var(--challenge-accent);
  background: color-mix(in srgb, var(--challenge-accent) 9%, var(--ui-surface));
}
.challenge-brief {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 22px;
  padding: 20px;
  border-bottom: 1px solid var(--ui-line);
}
.challenge-brief h2 {
  font-size: 1.18rem;
}
.challenge-brief > div > p:last-child {
  max-width: 62ch;
  margin-top: 7px;
  color: var(--ui-muted);
  font-size: 0.8rem;
  line-height: 1.65;
}
.challenge-facts {
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 24px;
  flex: 0 0 auto;
}
.challenge-facts div {
  display: grid;
  gap: 4px;
}
.challenge-facts dt {
  color: var(--ui-muted);
  font-size: 0.63rem;
}
.challenge-facts dd {
  font: 600 0.75rem var(--font-code, monospace);
}
.challenge-admin-form {
  display: grid;
  grid-template-columns: repeat(5, minmax(100px, 1fr));
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--ui-line);
  background: var(--ui-page);
}
.challenge-admin-form label {
  display: grid;
  gap: 6px;
  color: var(--ui-muted);
  font-size: 0.69rem;
}
.challenge-admin-form .is-wide {
  grid-column: span 2;
}
.challenge-admin-form .challenge-checkbox {
  align-content: end;
  grid-template-columns: auto 1fr;
  align-items: center;
}
.challenge-admin-form .challenge-checkbox input {
  width: auto;
  accent-color: var(--challenge-accent);
}
.challenge-waveboard {
  position: relative;
  padding: 12px 16px 8px;
  border-bottom: 1px solid var(--ui-line);
  background: var(--ui-page);
}
.challenge-wave-legend {
  display: flex;
  gap: 16px;
  margin-bottom: 7px;
  color: var(--ui-muted);
  font-size: 0.65rem;
}
.challenge-wave-legend span::before {
  content: '';
  display: inline-block;
  width: 14px;
  height: 2px;
  margin: 0 6px 3px 0;
  background: currentColor;
}
.challenge-wave-legend .is-input {
  color: var(--challenge-input);
}
.challenge-wave-legend .is-target {
  color: var(--challenge-target);
}
.challenge-wave-legend .is-output {
  color: var(--challenge-accent);
}
#challenge-waveform {
  display: block;
  width: 100%;
  height: 150px;
}
.challenge-build-area {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) 220px;
  min-height: 520px;
}
.challenge-palette,
.challenge-inspector {
  padding: 14px 11px;
}
.challenge-palette {
  border-right: 1px solid var(--ui-line);
}
.challenge-inspector {
  border-left: 1px solid var(--ui-line);
}
.challenge-palette h3,
.challenge-inspector h3 {
  font-size: 0.8rem;
}
.challenge-palette > p,
.challenge-inspector > p {
  margin: 6px 0 12px;
  color: var(--ui-muted);
  font-size: 0.67rem;
  line-height: 1.5;
}
#challenge-palette {
  display: grid;
  gap: 5px;
}
#challenge-palette button {
  justify-content: flex-start;
  min-height: 32px;
  padding: 6px 8px;
  font-size: 0.7rem;
}
.challenge-symbol {
  width: 23px;
  color: var(--challenge-accent);
  font: 700 0.7rem var(--font-code, monospace);
}
.challenge-canvas-wrap {
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--ui-page);
}
.challenge-canvas-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  min-height: 43px;
  padding: 7px 12px;
  border-bottom: 1px solid var(--ui-line);
  color: var(--ui-muted);
  font-size: 0.66rem;
}
.challenge-canvas-toolbar > span {
  flex: 1 1 280px;
}
.challenge-canvas-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 5px;
}
.challenge-canvas-actions button {
  min-height: 30px;
  padding: 5px 8px;
  font-size: 0.67rem;
}
.challenge-stage {
  min-height: 470px;
  flex: 1;
  overflow: auto;
  --circuit-accent: var(--challenge-accent);
  --circuit-surface: var(--ui-page);
  --circuit-grid: var(--ui-line);
  --circuit-ink: var(--ui-text);
}
.challenge-stage svg {
  min-width: 720px;
}
#challenge-selection {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}
#challenge-parameters {
  display: grid;
  gap: 9px;
}
#challenge-parameters label {
  display: grid;
  gap: 5px;
  color: var(--ui-muted);
  font-size: 0.65rem;
}
.challenge-inspector-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}
.challenge-shortcuts-dialog {
  width: min(620px, calc(100vw - 28px));
  max-height: min(720px, calc(100dvh - 28px));
  box-sizing: border-box;
  padding: 20px;
  border: 1px solid var(--ui-line-strong);
  border-radius: 10px;
  background: var(--ui-surface);
  color: var(--ui-text);
  box-shadow: 0 24px 70px color-mix(in srgb, var(--ui-page) 70%, transparent);
}
.challenge-shortcuts-dialog::backdrop {
  background: color-mix(in srgb, var(--ui-page) 76%, transparent);
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
}
.challenge-shortcuts-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.challenge-shortcuts-heading h2,
.challenge-shortcuts-dialog p,
.challenge-shortcuts-dialog dl {
  margin: 0;
}
.challenge-shortcuts-dialog > p {
  margin-top: 10px;
  color: var(--ui-muted);
  font-size: 0.78rem;
  line-height: 1.6;
}
.challenge-shortcuts-dialog dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 16px;
  overflow: hidden;
  border: 1px solid var(--ui-line);
  border-radius: 7px;
  background: var(--ui-line);
}
.challenge-shortcuts-dialog dl div {
  display: grid;
  gap: 5px;
  padding: 11px;
  background: var(--ui-page);
}
.challenge-shortcuts-dialog dt {
  font-size: 0.72rem;
}
.challenge-shortcuts-dialog dd {
  margin: 0;
  color: var(--ui-muted);
  font-size: 0.7rem;
}
.challenge-shortcuts-dialog kbd {
  padding: 2px 5px;
  border: 1px solid var(--ui-line-strong);
  border-radius: 4px;
  background: var(--ui-surface);
  font: 600 0.68rem var(--font-code, monospace);
}
.challenge-shortcuts-dialog button {
  min-height: 34px;
  padding: 6px 10px;
  border: 1px solid var(--ui-line-strong);
  border-radius: 6px;
  background: var(--ui-page);
  color: var(--ui-text);
  font: inherit;
  cursor: pointer;
}
.challenge-celebration {
  position: fixed;
  z-index: 20;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.challenge-celebration[hidden] {
  display: none;
}
.challenge-celebration canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.challenge-celebration-message {
  position: absolute;
  top: max(72px, 12vh);
  left: 50%;
  display: grid;
  gap: 4px;
  min-width: min(300px, calc(100vw - 32px));
  padding: 13px 18px;
  border: 1px solid color-mix(in srgb, var(--challenge-accent, #74d6a4) 66%, white);
  border-radius: 8px;
  background: color-mix(in srgb, var(--ui-surface) 91%, transparent);
  color: var(--ui-text);
  text-align: center;
  box-shadow: 0 16px 42px color-mix(in srgb, var(--ui-page) 60%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  opacity: 0;
  transform: translate(-50%, -12px) scale(0.96);
}
.challenge-celebration.is-active .challenge-celebration-message {
  animation: challenge-success-message 1.9s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}
.challenge-celebration-message strong {
  color: var(--challenge-accent, #74d6a4);
  font-size: 1.02rem;
  letter-spacing: 0.04em;
}
.challenge-celebration-message span {
  color: var(--ui-muted);
  font-size: 0.72rem;
}
@keyframes challenge-success-message {
  0% {
    opacity: 0;
    transform: translate(-50%, -12px) scale(0.96);
  }
  14%,
  72% {
    opacity: 1;
    transform: translate(-50%, 0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -5px) scale(0.99);
  }
}
.challenge-runbar {
  position: sticky;
  z-index: 2;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 18px;
  border-top: 1px solid var(--ui-line);
  background: color-mix(in srgb, var(--ui-surface) 94%, transparent);
  box-shadow: 0 -10px 24px color-mix(in srgb, var(--ui-page) 68%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.challenge-runbar strong {
  font-size: 0.8rem;
}
.challenge-runbar p {
  margin-top: 3px;
  color: var(--ui-muted);
  font-size: 0.68rem;
}
.challenge-leaderboard {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 5px;
}
.challenge-rank {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr) auto;
  align-items: center;
  gap: 7px;
  padding: 8px 6px;
  border-right: 1px solid var(--ui-line);
  font-size: 0.7rem;
}
.challenge-rank:last-child {
  border-right: 0;
}
.challenge-rank b {
  color: var(--challenge-accent);
  font: 700 0.72rem var(--font-code, monospace);
}
.challenge-rank strong {
  overflow: hidden;
  text-overflow: ellipsis;
}
.challenge-rank small {
  color: var(--ui-muted);
  text-align: right;
  font: 0.62rem var(--font-code, monospace);
}
.challenge-ranking-note,
.challenge-empty {
  margin-top: 12px !important;
  color: var(--ui-muted);
  font-size: 0.65rem;
  line-height: 1.6;
}
.challenge-empty-state {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  min-height: 220px;
  padding: 32px;
  border: 1px solid var(--ui-line);
  border-radius: 10px;
  background: var(--ui-surface);
}
.challenge-empty-state h2 {
  margin-bottom: 8px;
  font-size: 1.2rem;
}
.challenge-empty-state p {
  max-width: 54ch;
  color: var(--ui-muted);
  font-size: 0.82rem;
  line-height: 1.7;
}
.challenge-empty-mark {
  display: grid;
  place-items: center;
  width: 86px;
  height: 86px;
  border: 1px solid color-mix(in srgb, var(--challenge-accent) 45%, var(--ui-line));
  border-radius: 50%;
  color: var(--challenge-accent);
  font: 700 1.05rem var(--font-code, monospace);
  letter-spacing: 0.05em;
}
.challenge-empty-mark sub {
  font-size: 0.55em;
}
.challenge-main.is-empty .challenge-workbench,
.challenge-main.is-empty .challenge-ranking {
  display: none;
}
.challenge-entry,
.circuit-challenge-entry {
  border-color: #74d6a4 !important;
  color: #3f9d70 !important;
}
@media (max-width: 1180px) {
  .challenge-build-area {
    grid-template-columns: 130px minmax(0, 1fr) 190px;
  }
  .challenge-admin-form {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 860px) {
  .challenge-main {
    padding: 76px 12px 86px;
  }
  .challenge-header {
    align-items: flex-start;
    flex-direction: column;
  }
  .challenge-levels {
    display: block;
  }
  .challenge-levels .challenge-side-heading {
    margin-bottom: 12px;
  }
  .challenge-brief {
    flex-direction: column;
  }
  .challenge-facts {
    width: 100%;
    justify-content: space-between;
  }
  .challenge-build-area {
    grid-template-columns: 1fr;
  }
  .challenge-palette {
    border-right: 0;
    border-bottom: 1px solid var(--ui-line);
  }
  .challenge-palette #challenge-palette {
    display: flex;
    overflow-x: auto;
  }
  .challenge-palette button {
    flex: 0 0 auto;
  }
  .challenge-inspector {
    border-left: 0;
    border-top: 1px solid var(--ui-line);
  }
  .challenge-runbar {
    align-items: flex-start;
    flex-direction: column;
  }
  .challenge-leaderboard {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .challenge-rank:nth-child(even) {
    border-right: 0;
  }
  .challenge-empty-state {
    grid-template-columns: auto minmax(0, 1fr);
  }
  .challenge-empty-state .challenge-button {
    grid-column: 1/-1;
  }
  .challenge-admin-form {
    grid-template-columns: repeat(2, 1fr);
  }
  .challenge-admin-form .is-wide {
    grid-column: 1/-1;
  }
}
@media (max-width: 560px) {
  .challenge-header h1 {
    max-width: 13ch;
    font-size: 1.45rem;
  }
  .challenge-level {
    flex-basis: 78vw;
  }
  .challenge-leaderboard {
    grid-template-columns: 1fr;
  }
  .challenge-rank,
  .challenge-rank:nth-child(even) {
    border-right: 0;
    border-bottom: 1px solid var(--ui-line);
  }
  .challenge-rank:last-child {
    border-bottom: 0;
  }
  .challenge-facts {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  .challenge-admin-form {
    grid-template-columns: 1fr;
  }
  .challenge-admin-form .is-wide {
    grid-column: auto;
  }
  .challenge-run-actions {
    width: 100%;
  }
  .challenge-run-actions button {
    flex: 1 1 42%;
  }
  .challenge-stage {
    min-height: 360px;
  }
  .challenge-canvas-actions {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .challenge-shortcuts-dialog dl {
    grid-template-columns: 1fr;
  }
  .challenge-empty-state {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 24px 20px;
  }
  .challenge-empty-state .challenge-button {
    grid-column: auto;
  }
  .challenge-empty-mark {
    width: 68px;
    height: 68px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .challenge-main * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
  .challenge-celebration.is-active .challenge-celebration-message {
    animation: none;
    opacity: 1;
    transform: translate(-50%, 0);
  }
}