.cpu-shell { overflow-x: hidden; }
.cpu-workspace { display: grid; grid-template-columns: minmax(300px, .78fr) minmax(0, 1.22fr); gap: 16px; align-items: start; }
.scenario-brief { display: grid; gap: 8px; margin-top: 12px; padding: 12px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(234,240,255,.045); }
.cpu-editor { display: grid; gap: 8px; }
.cpu-editor-row { display: grid; grid-template-columns: 4.5rem minmax(0, 1fr); gap: 8px; align-items: start; }
.cpu-address-label { display: grid; gap: 2px; min-height: 44px; padding: 8px; border: 1px solid var(--line); border-radius: var(--radius); font-weight: 900; }
.cpu-address-label span { color: var(--muted); font-size: .82rem; }
.cpu-editor input { font-family: Consolas, "Courier New", monospace; text-transform: uppercase; }
.field-error { color: #ffd2dc; font-weight: 800; }
.cpu-trace-panel { min-width: 0; }
.cpu-status-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; margin: 12px 0; }
.cpu-status-card { padding: 10px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(234,240,255,.055); }
.cpu-status-card strong { display: block; color: var(--muted); font-size: .78rem; text-transform: uppercase; }
.cpu-status-card code { display: block; white-space: normal; overflow-wrap: anywhere; font-size: 1rem; }
.cpu-status-card.changed { border-color: rgba(250,204,21,.9); box-shadow: 0 0 0 2px rgba(250,204,21,.12); }
.cpu-phase { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.cpu-badge { display: inline-flex; align-items: center; min-height: 30px; padding: 2px 9px; border: 1px solid var(--line); border-radius: 999px; background: rgba(34,211,238,.08); font-weight: 900; }
.cpu-badge.changed { border-color: rgba(250,204,21,.85); background: rgba(250,204,21,.12); }
.cpu-main-grid { display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); gap: 14px; align-items: start; }
.cpu-diagram { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 12px 0; }
.cpu-component { min-height: 74px; padding: 10px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(14,20,36,.72); }
.cpu-component.active { border-color: rgba(34,211,238,.9); box-shadow: 0 0 0 2px rgba(34,211,238,.14); }
.cpu-component.changed { outline: 2px solid rgba(250,204,21,.65); outline-offset: 2px; }
.cpu-component h4 { margin: 0 0 4px; }
.cpu-bus { grid-column: 1 / -1; padding: 10px; border: 2px dashed var(--line); border-radius: var(--radius); background: rgba(234,240,255,.035); }
.cpu-bus.active { border-color: rgba(34,211,238,.9); }
.cpu-transfer { padding: 12px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(234,240,255,.055); }
.cpu-transfer code { font-size: 1rem; white-space: normal; }
.cpu-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); margin-top: 12px; }
.cpu-table { width: 100%; min-width: 760px; border-collapse: collapse; }
.cpu-table caption { text-align: left; padding: 10px; color: var(--muted); font-weight: 900; }
.cpu-table th, .cpu-table td { border-top: 1px solid var(--line); padding: 8px; text-align: left; vertical-align: top; }
.cpu-table .current-row { background: rgba(34,211,238,.1); }
.cpu-table .instruction-row { outline: 2px solid rgba(34,211,238,.42); outline-offset: -3px; }
.cpu-table .changed-row { box-shadow: inset 4px 0 0 rgba(250,204,21,.9); }
.cpu-table code { white-space: nowrap; }
.cpu-io-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.cpu-queue, .cpu-output-list { padding: 10px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(234,240,255,.045); }
.cpu-queue ol, .cpu-output-list ol { margin: 8px 0 0 24px; padding: 0; }
.cpu-consumed { text-decoration: line-through; color: var(--muted); }
.cpu-current-input { outline: 2px solid rgba(34,211,238,.9); outline-offset: 2px; }
.cpu-worksheet { display: none; }
.teacher-display .cpu-config, .teacher-display .site-header, .teacher-display .breadcrumbs, .teacher-display footer, .teacher-display .no-display { display: none; }
.teacher-display main { width: min(calc(100% - 28px), 1500px); }
.teacher-display .cpu-workspace { grid-template-columns: 1fr; }
.teacher-display .cpu-trace-panel { font-size: 1.16rem; }
.teacher-display .cpu-status-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
@media (max-width: 1040px) {
  .cpu-workspace, .cpu-main-grid { grid-template-columns: 1fr; }
  .cpu-status-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .cpu-status-grid, .cpu-io-grid, .cpu-diagram { grid-template-columns: 1fr; }
  .cpu-editor-row { grid-template-columns: 1fr; }
  .cpu-table { min-width: 700px; }
  .cpu-phase .cpu-badge { width: 100%; justify-content: center; }
}
@media (max-width: 340px) {
  .cpu-table { min-width: 660px; }
  .cpu-status-card code { font-size: .92rem; }
}
@media (prefers-reduced-motion: reduce) {
  .cpu-component, .cpu-bus, .cpu-status-card { transition: none !important; }
}
@media print {
  .cpu-shell { padding: 0; }
  .cpu-workspace, .cpu-main-grid, .cpu-io-grid { grid-template-columns: 1fr; }
  .cpu-config, .site-header, .breadcrumbs, .simulation-controls, .sim-actions, footer, .no-print { display: none !important; }
  .cpu-table { min-width: 0; font-size: 9pt; }
  .cpu-status-grid { grid-template-columns: repeat(3, 1fr); }
  .cpu-diagram { grid-template-columns: repeat(2, 1fr); }
  .cpu-component, .cpu-bus, .cpu-transfer, .cpu-status-card, .simulation-card, .simulation-panel { background: #fff; color: #111; border-color: #777; box-shadow: none; break-inside: avoid; }
  .learner-blank .cpu-trace-panel { display: none; }
  .learner-blank .cpu-worksheet { display: block; }
  .learner-blank .simulation-card:not(.worksheet-card) { display: none !important; }
}