.spacetime-app-layout {
  grid-template-columns: minmax(285px, 315px) minmax(0, 1fr);
}

.spacetime-app .control-panel {
  max-height: calc(100vh - 104px);
  overflow-y: auto;
  scrollbar-width: thin;
}

.spacetime-app .control-panel select {
  width: 100%;
  min-height: 42px;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--hairline);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
}

.spacetime-app .control-panel > p {
  font-size: 0.88rem;
}

.spacetime-app .control-group legend,
.spacetime-app .field-label {
  font-size: 0.75rem;
}

.spacetime-app .check-row,
.spacetime-app .lab-button {
  font-size: 0.875rem;
}

.spacetime-app .lab-button {
  min-height: 44px;
}

.field-label-spaced {
  margin-top: 1rem;
}

.control-help {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

.full-width-button {
  width: 100%;
  margin-top: 0.65rem;
}

.draw-mode-row .lab-button[aria-pressed="true"] {
  border-color: var(--forest);
  background: var(--forest);
  color: var(--white);
}

.spacetime-stage-heading {
  align-items: center;
}

.spacetime-workbench {
  display: grid;
  grid-template-columns: minmax(300px, 0.78fr) minmax(480px, 1.42fr);
  min-height: 660px;
  background: #173b36;
}

.slice-panel,
.history-panel {
  min-width: 0;
}

.slice-panel {
  display: flex;
  flex-direction: column;
  border-right: 1px solid rgba(255, 253, 247, 0.16);
  background: #e9e4d7;
}

.history-panel {
  display: flex;
  min-height: 660px;
  flex-direction: column;
  background: #153832;
  color: var(--white);
}

.pane-heading {
  display: flex;
  min-height: 84px;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.15rem;
  border-bottom: 1px solid rgba(23, 33, 29, 0.16);
}

.pane-heading > div {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 0.65rem;
}

.pane-heading span {
  color: var(--forest);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.pane-heading h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
}

.pane-heading p {
  max-width: 180px;
  margin: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.45;
  text-align: right;
}

.pane-heading-dark {
  border-bottom-color: rgba(229, 255, 247, 0.2);
  background: #173b34;
}

.pane-heading-dark span {
  color: #79d8c5;
}

.pane-heading-dark p {
  color: rgba(243, 255, 251, 0.72);
}

.seed-grid-frame {
  display: grid;
  width: min(100%, 600px);
  aspect-ratio: 1;
  align-self: center;
  padding: clamp(0.8rem, 2.2vw, 1.45rem);
  place-items: stretch;
}

#seed-grid {
  display: block;
  width: 100%;
  height: 100%;
  border: 1px solid rgba(7, 62, 53, 0.45);
  background: #09251f;
  cursor: crosshair;
  image-rendering: pixelated;
  touch-action: none;
  user-select: none;
}

#seed-grid:focus-visible {
  outline: 4px solid #d88652;
  outline-offset: 4px;
}

.pane-help {
  max-width: 470px;
  margin: auto auto 0;
  padding: 0 1.25rem 1.2rem;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.55;
}

.history-viewport {
  position: relative;
  min-height: 576px;
  flex: 1;
  overflow: hidden;
  background: #03050a;
}

#history-canvas {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
}

#history-canvas.is-dragging {
  cursor: grabbing;
}

#history-canvas:focus-visible {
  outline: 3px solid #f4a261;
  outline-offset: -5px;
}

.history-message {
  position: absolute;
  z-index: 4;
  inset: 0;
  display: grid;
  padding: 2rem;
  background: rgba(3, 5, 10, 0.97);
  color: rgba(215, 225, 245, 0.9);
  place-items: center;
  text-align: center;
}

.history-message[hidden] {
  display: none;
}

.history-axis {
  position: absolute;
  z-index: 2;
  top: 1.15rem;
  bottom: 5.2rem;
  left: 1rem;
  display: grid;
  grid-template-rows: auto 1fr auto;
  justify-items: center;
  gap: 0.5rem;
  color: rgba(177, 194, 230, 0.64);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  pointer-events: none;
  text-transform: uppercase;
}

.history-axis span {
  writing-mode: vertical-rl;
}

.history-axis i {
  width: 1px;
  min-height: 48px;
  background: linear-gradient(to top, rgba(57, 72, 109, 0.18), #96a7cc);
}

.history-overlay {
  position: absolute;
  z-index: 3;
  right: 1rem;
  bottom: 1rem;
  left: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding: 0.5rem 0.65rem;
  border: 1px solid rgba(150, 167, 204, 0.18);
  background: rgba(3, 5, 10, 0.68);
  color: rgba(177, 194, 230, 0.8);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  backdrop-filter: blur(6px);
  pointer-events: none;
  text-transform: uppercase;
}

.history-overlay strong {
  color: #b1c2e6;
  font-weight: 500;
}

.spacetime-app .lab-button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

@media (max-width: 1250px) {
  .spacetime-workbench {
    grid-template-columns: minmax(280px, 0.88fr) minmax(420px, 1.2fr);
  }

  .pane-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .pane-heading p {
    max-width: none;
    text-align: left;
  }
}

@media (max-width: 1200px) {
  .spacetime-app-layout {
    grid-template-columns: 1fr;
  }

  .spacetime-app .control-panel {
    position: static;
    max-height: none;
    overflow: visible;
  }
}

@media (max-width: 980px) {
  .spacetime-workbench {
    grid-template-columns: minmax(300px, 0.82fr) minmax(430px, 1.18fr);
  }
}

@media (max-width: 800px) {
  .spacetime-workbench {
    grid-template-columns: 1fr;
  }

  .slice-panel {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 253, 247, 0.16);
  }

  .seed-grid-frame {
    width: min(100%, 570px);
  }

  .history-panel,
  .history-viewport {
    min-height: 520px;
  }
}

@media (max-width: 520px) {
  .spacetime-stage-heading {
    align-items: flex-start;
  }

  .pane-heading {
    min-height: 0;
  }

  .history-panel,
  .history-viewport {
    min-height: 430px;
  }

  .history-axis {
    display: none;
  }

  .history-overlay {
    right: 0.6rem;
    bottom: 0.6rem;
    left: auto;
  }

  .history-overlay strong {
    width: auto;
  }
}

@media (forced-colors: active) {
  #seed-grid,
  #history-canvas {
    border: 2px solid CanvasText;
  }
}

@media (prefers-reduced-motion: reduce) {
  #history-canvas {
    scroll-behavior: auto;
  }
}