.datapath-main {
  max-width: 72rem;
}

.datapath-header {
  margin-bottom: 2rem;
  padding-top: 1rem;
}

.datapath-header .site-tagline {
  max-width: 46rem;
  margin-inline: auto;
}

.overview-panel,
.control-panel,
.instruction-panel,
.diagram-panel,
.state-panel,
.register-area,
.memory-area,
.notes-panel,
.log-panel {
  border: 1px solid var(--wa-gray-light);
  border-radius: 8px;
  background: var(--wa-white);
}

.overview-panel,
.control-panel,
.instruction-panel,
.diagram-panel,
.state-panel,
.register-area,
.memory-area,
.notes-panel,
.log-panel {
  padding: 1rem;
}

.overview-panel,
.control-panel,
.instruction-panel,
.datapath-layout,
.register-panel,
.notes-panel,
.log-panel {
  margin-bottom: 1rem;
}

.panel-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
}

.overview-panel {
  display: grid;
  gap: 0.85rem;
}

.overview-panel p,
.notes-panel p,
.instruction-panel p {
  margin: 0;
  color: var(--wa-ink-light);
  font-size: 0.92rem;
  line-height: 1.9;
}

.overview-terms {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.overview-terms span {
  display: inline-flex;
  gap: 0.45rem;
  align-items: center;
  min-height: 2rem;
  padding: 0.25rem 0.7rem;
  border: 1px solid var(--wa-gray-light);
  border-radius: 999px;
  background: var(--wa-bg);
  color: var(--wa-ink-light);
  font-size: 0.85rem;
}

.overview-terms strong {
  color: var(--wa-ink);
}

.control-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.85rem;
  align-items: center;
}

.mode-group,
.step-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.mode-group {
  justify-content: flex-start;
  justify-self: start;
}

.step-controls {
  justify-content: flex-end;
  justify-self: end;
}

.mode-button {
  min-height: 2.4rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--wa-gray-light);
  border-radius: 6px;
  background: var(--wa-white);
  color: var(--wa-ink);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
}

.mode-button.is-active {
  border-color: var(--wa-orange);
  background: var(--wa-orange-pale);
  color: var(--wa-orange-dark);
}

.instruction-panel {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: center;
}

.instruction-panel > div {
  display: grid;
  gap: 0.2rem;
}

.instruction-label {
  color: var(--wa-gray);
  font-size: 0.75rem;
  font-weight: 700;
}

#instructionText {
  font-family: Consolas, "Courier New", monospace;
  font-size: 1.35rem;
  letter-spacing: 0;
}

.datapath-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 16rem;
  gap: 0.8rem;
  align-items: stretch;
}

.diagram-panel {
  min-width: 0;
}

.datapath-diagram {
  position: relative;
  display: grid;
  grid-template-columns: 9.8rem minmax(7rem, 1fr) 9.8rem;
  grid-template-rows: 5.9rem 5.9rem 4.8rem;
  gap: 0.9rem;
  min-height: 22.4rem;
  margin-top: 0.7rem;
  padding: 0.85rem;
  border: 1px solid var(--wa-gray-light);
  border-radius: 8px;
  background: var(--wa-bg);
  overflow: hidden;
}

.module-card {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 0.25rem;
  align-content: center;
  min-height: 4.6rem;
  padding: 0.62rem;
  border: 2px solid var(--wa-gray-light);
  border-radius: 6px;
  background: var(--wa-white);
  box-shadow: 0 1px 0 rgba(17, 24, 39, 0.04);
}

.module-card.is-active {
  border-color: var(--wa-orange);
  background: #fff9ec;
}

.module-card strong {
  color: var(--wa-ink);
  font-size: 0.96rem;
}

.module-card p {
  margin: 0;
  color: var(--wa-ink-light);
  font-size: 0.78rem;
  line-height: 1.45;
}

.register-file {
  grid-column: 1;
  grid-row: 1 / span 2;
}

.alu-box {
  grid-column: 2;
  grid-row: 1;
}

.memory-box {
  grid-column: 3;
  grid-row: 1 / span 2;
}

.writeback-box {
  grid-column: 2;
  grid-row: 2;
}

.control-box {
  grid-column: 1 / span 3;
  grid-row: 3;
}

.wire {
  position: absolute;
  z-index: 1;
  display: block;
  border-radius: 999px;
  background: #cec9bd;
}

.wire.is-active {
  background: var(--wa-orange);
  box-shadow: 0 0 0 4px rgba(255, 153, 0, 0.14);
}

.wire-control {
  left: 11%;
  right: 11%;
  bottom: 6.55rem;
  height: 0.28rem;
}

.wire-reg-alu-a {
  left: 10.05rem;
  top: 4.45rem;
  width: calc(50% - 13.1rem);
  height: 0.28rem;
}

.wire-reg-alu-b {
  left: 10.05rem;
  top: 8.6rem;
  width: calc(50% - 13.1rem);
  height: 0.28rem;
}

.wire-alu-memory {
  right: 10.05rem;
  top: 4.45rem;
  width: calc(50% - 13.1rem);
  height: 0.28rem;
}

.wire-alu-writeback {
  left: calc(50% - 0.14rem);
  top: 6.95rem;
  width: 0.28rem;
  height: 3.4rem;
}

.wire-memory-writeback {
  right: 10.05rem;
  top: 8.6rem;
  width: calc(50% - 13.1rem);
  height: 0.28rem;
}

.wire-writeback-register {
  left: 10.05rem;
  top: 12.15rem;
  width: calc(50% - 13.1rem);
  height: 0.28rem;
}

.state-panel {
  display: grid;
  gap: 0.8rem;
  align-content: start;
}

.step-readout {
  display: grid;
  gap: 0.1rem;
}

.step-readout span {
  color: var(--wa-gray);
  font-weight: 700;
}

.step-readout strong {
  color: var(--wa-orange-dark);
  font-size: 2.5rem;
  line-height: 1;
}

.status-text {
  margin: 0;
  color: var(--wa-ink-light);
  font-size: 0.92rem;
  line-height: 1.9;
}

.signal-list {
  display: grid;
  gap: 0.45rem;
  margin: 0;
}

.signal-list div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.5rem;
  align-items: center;
  min-height: 2rem;
  padding: 0.3rem 0.5rem;
  border: 1px solid var(--wa-gray-light);
  border-radius: 6px;
  background: var(--wa-bg);
}

.signal-list dt {
  color: var(--wa-gray);
  font-size: 0.74rem;
  font-weight: 700;
}

.signal-list dd {
  margin: 0;
  color: var(--wa-ink);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.8rem;
  font-weight: 700;
}

.register-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(18rem, 0.9fr);
  gap: 1rem;
  align-items: start;
}

.register-grid,
.memory-grid {
  display: grid;
  gap: 0.55rem;
  margin-top: 0.85rem;
}

.register-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.memory-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.value-cell {
  display: grid;
  gap: 0.15rem;
  min-height: 3.7rem;
  padding: 0.65rem;
  border: 1px solid var(--wa-gray-light);
  border-radius: 6px;
  background: var(--wa-bg);
}

.value-cell.is-read {
  border-color: #2b7a9e;
  background: #eef8fb;
}

.value-cell.is-written {
  border-color: var(--wa-orange);
  background: var(--wa-orange-pale);
}

.value-cell span {
  color: var(--wa-gray);
  font-size: 0.75rem;
  font-weight: 700;
}

.value-cell strong {
  color: var(--wa-ink);
  font-size: 1.2rem;
  letter-spacing: 0;
}

.inline-token {
  display: inline-grid;
  place-items: center;
  min-width: 1.55rem;
  min-height: 1.55rem;
  padding: 0 0.35rem;
  border-radius: 6px;
  background: var(--wa-orange-pale);
  color: var(--wa-orange-dark);
  font-weight: 700;
  letter-spacing: 0;
}

.event-log {
  display: grid;
  gap: 0.45rem;
  margin: 0;
  padding-left: 1.3rem;
  color: var(--wa-ink-light);
  font-size: 0.9rem;
  line-height: 1.7;
}

.event-log li::marker {
  color: var(--wa-orange);
  font-weight: 700;
}

.info-modal.hidden {
  display: none;
}

.info-modal {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.info-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 24, 39, 0.45);
}

.info-modal-panel {
  position: relative;
  z-index: 1;
  width: min(34rem, 100%);
  border: 1px solid var(--wa-gray-light);
  border-radius: 8px;
  background: var(--wa-white);
  box-shadow: 0 24px 60px rgba(17, 24, 39, 0.18);
}

.info-modal-header {
  display: grid;
  gap: 0.2rem;
  padding: 1.2rem 1.2rem 0.6rem;
}

.info-modal-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: 2.2rem;
  height: 2.2rem;
  border: 1px solid var(--wa-gray-light);
  border-radius: 50%;
  background: var(--wa-bg);
  color: var(--wa-ink);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.info-modal-kicker {
  margin: 0;
  color: var(--wa-orange-dark);
  font-size: 0.78rem;
  font-weight: 700;
}

.info-modal-header h2 {
  margin: 0;
  padding-right: 2.5rem;
  font-size: 1.35rem;
}

.info-modal-body {
  display: grid;
  gap: 0.75rem;
  padding: 0 1.2rem 1.2rem;
  color: var(--wa-ink-light);
  line-height: 1.8;
}

.info-modal-body p {
  margin: 0;
}

.info-modal-body code {
  padding: 0.08rem 0.25rem;
  border-radius: 4px;
  background: var(--wa-bg);
  color: var(--wa-ink);
}

@media (max-width: 860px) {
  .control-panel,
  .instruction-panel,
  .datapath-layout,
  .register-panel {
    grid-template-columns: 1fr;
  }

  .step-controls {
    justify-content: flex-start;
    justify-self: start;
  }

  .datapath-diagram {
    grid-template-columns: 1fr;
    grid-template-rows: none;
    min-height: auto;
  }

  .register-file,
  .alu-box,
  .memory-box,
  .writeback-box,
  .control-box {
    grid-column: auto;
    grid-row: auto;
  }

  .wire {
    display: none;
  }

  .register-grid,
  .memory-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .mode-button,
  .step-controls button {
    flex: 1 1 8rem;
  }

  .register-grid,
  .memory-grid {
    grid-template-columns: 1fr;
  }
}