html,
body {
  overflow: hidden;
}

.cml-toolbar {
  min-width: 0;
  overflow: hidden;
}

.cml-toolbar .toolbar-left,
.cml-toolbar .toolbar-right {
  min-width: 0;
}

.lesson-select {
  min-width: 220px;
  max-width: 300px;
  height: 30px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 12px;
  padding: 0 8px;
}

.btn-explain {
  border-radius: 0 4px 4px 0;
  border: none;
}

.cml-workbench {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(720px, 1fr) 360px;
  overflow: hidden;
  background: var(--bg-primary);
}

.workbench-main,
.workbench-side {
  min-height: 0;
  overflow: auto;
}

.workbench-main {
  display: grid;
  grid-template-rows: minmax(320px, 1.2fr) 230px minmax(260px, 0.8fr);
  border-right: 1px solid var(--border-color);
}

.workbench-side {
  display: flex;
  flex-direction: column;
}

.top-grid {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(320px, 1fr);
}

.bottom-grid {
  min-height: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(280px, 1fr));
  grid-auto-rows: minmax(210px, 1fr);
}

.panel {
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-primary);
}

.workbench-side .panel {
  border-right: none;
  min-height: 170px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 32px;
  padding: 6px 10px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
}

.panel-header i {
  margin-right: 6px;
}

.source-editor {
  flex: 1;
  min-height: 0;
}

.source-editor .ace_editor {
  width: 100% !important;
  height: 100% !important;
}

.ace-current-source-line {
  position: absolute;
  background: rgba(59, 130, 246, 0.22);
  border-left: 3px solid var(--accent);
}

.diagnostics-strip {
  max-height: 74px;
  overflow: auto;
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.diagnostic {
  padding: 5px 8px;
  font-size: 12px;
  color: var(--text-secondary);
  border-left: 3px solid var(--accent);
}

.diagnostic span {
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.diagnostic-error {
  border-left-color: var(--danger);
}

.diag-count.has-errors {
  color: var(--danger);
}

.assembly-list {
  flex: 1;
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 12px;
}

.assembly-row {
  width: 100%;
  min-height: 26px;
  display: grid;
  grid-template-columns: 64px 1fr 42px;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  border: 0;
  border-bottom: 1px solid rgba(128, 128, 128, 0.12);
  background: transparent;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
}

.assembly-row:hover,
.assembly-row.active {
  background: var(--accent-light);
}

.assembly-row.active {
  box-shadow: inset 3px 0 0 var(--accent);
}

.label-row .asm-text {
  color: var(--accent);
  font-weight: 700;
}

.asm-address,
.asm-line {
  color: var(--text-muted);
  font-size: 11px;
}

.register-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  padding: 8px;
}

.register-cell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-width: 0;
  padding: 6px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 11px;
  cursor: pointer;
}

.register-cell strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.changed {
  animation: cml-pulse 0.6s ease-out;
}

@keyframes cml-pulse {
  from { background: rgba(34, 197, 94, 0.28); }
  to { background: transparent; }
}

.flags-row {
  display: flex;
  gap: 6px;
  padding: 0 8px 8px;
}

.flag {
  min-width: 32px;
  padding: 3px 6px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-muted);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
}

.flag.on {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.ir-line,
.empty-panel {
  padding: 8px;
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.45;
}

.alu-card,
.inspector-card {
  padding: 10px;
}

.alu-op {
  font-size: 22px;
  font-weight: 800;
  color: var(--accent);
}

.alu-values {
  display: grid;
  gap: 4px;
  margin: 8px 0;
  font-family: var(--font-mono);
  font-size: 12px;
}

.mini-toggle {
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 11px;
  padding: 2px 6px;
}

.segment-map {
  display: flex;
  height: 34px;
  padding: 8px;
  gap: 3px;
}

.segment {
  min-width: 50px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 10px;
  text-transform: uppercase;
  cursor: pointer;
}

.segment-text { border-color: #64748b; }
.segment-data { border-color: #0ea5e9; }
.segment-io { border-color: #f59e0b; }
.segment-heap { border-color: #16a34a; }
.segment-stack { border-color: #ef4444; }

.segmented {
  display: inline-flex;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
}

.segmented button {
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  font-size: 10px;
  padding: 3px 7px;
  cursor: pointer;
}

.segmented button.active {
  background: var(--accent);
  color: #fff;
}

.memory-grid {
  flex: 1;
  overflow: auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(74px, 1fr));
  align-content: start;
  gap: 4px;
  padding: 8px;
}

.memory-byte {
  height: 42px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font-mono);
  cursor: pointer;
}

.memory-byte span {
  font-size: 10px;
  color: var(--text-muted);
}

.memory-byte strong {
  font-size: 13px;
}

.memory-byte.read {
  border-color: #f59e0b;
}

.memory-byte.write {
  border-color: var(--success);
  background: rgba(34, 197, 94, 0.12);
}

.memory-byte.selected {
  outline: 2px solid var(--accent);
}

.stack-list,
.pointer-list,
.heap-blocks {
  flex: 1;
  overflow: auto;
  padding: 8px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.frame-card,
.heap-block,
.pointer-row,
.lesson-body,
.interrupt-current,
.virtual-file,
.handle-row,
.file-event {
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-secondary);
}

.frame-card {
  padding: 8px;
}

.frame-title,
.variable-row,
.heap-block,
.pointer-row,
.handle-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 8px;
}

.frame-title span,
.frame-meta,
.heap-block small,
.pointer-row small {
  color: var(--text-muted);
  font-size: 11px;
}

.variable-row,
.heap-block,
.pointer-row {
  width: 100%;
  border: 0;
  border-radius: 4px;
  padding: 5px;
  background: transparent;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
}

.variable-row:hover,
.heap-block:hover,
.pointer-row:hover {
  background: var(--bg-hover);
}

.heap-block.live {
  border-left: 3px solid var(--success);
}

.heap-block.free {
  opacity: 0.72;
  border-left: 3px solid var(--text-muted);
}

.pointer-row.invalid {
  border-left: 3px solid var(--danger);
}

.pointer-row.valid {
  border-left: 3px solid var(--success);
}

.event-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  padding: 0 8px 8px;
}

.event-strip span {
  padding: 3px 6px;
  border-radius: 4px;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 11px;
}

.file-grid,
.compare-grid {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.virtual-files,
.file-handles {
  min-height: 0;
  overflow: auto;
  padding: 8px;
  border-right: 1px solid var(--border-color);
}

.file-handles {
  border-right: 0;
}

.subhead {
  margin-bottom: 6px;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.virtual-file {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 6px;
  margin-bottom: 8px;
}

.virtual-file span {
  font-weight: 600;
  font-size: 12px;
}

.virtual-file textarea {
  min-height: 74px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  resize: vertical;
}

.handle-row,
.file-event {
  padding: 6px;
  margin-bottom: 6px;
  font-size: 12px;
}

.handle-row.closed {
  opacity: 0.7;
}

.interrupt-current {
  margin: 8px;
  padding: 8px;
  display: grid;
  gap: 6px;
}

.interrupt-current.trap {
  border-color: var(--danger);
}

.interrupt-current code {
  white-space: pre-wrap;
  color: var(--text-muted);
}

.vector-table {
  display: grid;
  gap: 3px;
  padding: 0 8px 8px;
}

.vector-row {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 6px;
  padding: 3px 5px;
  border-radius: 4px;
  font-size: 11px;
}

.vector-row.active {
  background: var(--accent-light);
  color: var(--accent);
}

.output-block,
.ai-output,
.compare-grid > div {
  min-height: 0;
  overflow: auto;
  padding: 8px;
}

pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.45;
}

.stderr.has-content {
  color: var(--danger);
}

.kv {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 4px 0;
  border-bottom: 1px solid rgba(128, 128, 128, 0.15);
  font-size: 12px;
}

.kv span {
  color: var(--text-muted);
}

.pointer-status {
  margin: 8px 0;
  padding: 6px;
  border-radius: 5px;
  font-size: 12px;
}

.pointer-status.valid {
  background: rgba(34, 197, 94, 0.14);
  color: var(--success);
}

.pointer-status.invalid {
  background: rgba(239, 68, 68, 0.14);
  color: var(--danger);
}

.byte-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.byte-preview code {
  padding: 3px 4px;
  border-radius: 3px;
  background: var(--bg-tertiary);
}

.lesson-body {
  margin: 8px;
  padding: 10px;
  overflow: auto;
}

.lesson-body h2 {
  font-size: 15px;
  margin-bottom: 2px;
}

.lesson-body p {
  color: var(--text-muted);
  font-size: 12px;
  margin-bottom: 8px;
}

.goal-list {
  display: grid;
  gap: 5px;
  margin-bottom: 10px;
}

.goal-list span,
.challenge,
.walkthrough {
  padding: 6px;
  border-radius: 5px;
  background: var(--bg-primary);
  font-size: 12px;
  line-height: 1.4;
}

.walkthrough,
.challenge {
  display: grid;
  gap: 4px;
  margin-top: 8px;
}

.compare-same {
  color: var(--success);
}

.compare-diff {
  color: var(--danger);
}

.loading-line {
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--accent);
  margin-bottom: 8px;
  font-size: 12px;
}

.cfg-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1200;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--modal-overlay);
}

.cfg-dialog {
  width: min(900px, 94vw);
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: var(--bg-primary);
  box-shadow: var(--shadow-lg);
}

.cfg-header,
.cfg-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-color);
}

.cfg-footer {
  border-top: 1px solid var(--border-color);
  border-bottom: 0;
}

.cfg-header h3 {
  flex: 1;
  font-size: 16px;
}

.cfg-hint {
  padding: 10px 14px;
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.45;
}

.cfg-textarea {
  flex: 1;
  min-height: 420px;
  margin: 0 14px;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--code-bg);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.45;
  resize: none;
}

.cfg-errors {
  margin: 8px 14px 0;
  padding: 8px 12px;
  border: 1px solid var(--danger);
  border-radius: 6px;
  color: var(--danger);
  font-size: 12px;
}

.cfg-spacer {
  flex: 1;
}

@media (max-width: 1100px) {
  .cml-workbench {
    grid-template-columns: 1fr;
  }

  .workbench-side {
    display: grid;
    grid-template-columns: repeat(2, minmax(280px, 1fr));
  }
}

@media (max-width: 760px) {
  .toolbar {
    flex-wrap: wrap;
  }

  .top-grid,
  .bottom-grid,
  .file-grid,
  .compare-grid,
  .workbench-side {
    grid-template-columns: 1fr;
  }

  .workbench-main {
    grid-template-rows: auto;
  }

  .source-panel,
  .assembly-panel {
    min-height: 320px;
  }
}