.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.headless-lab-page {
  min-height: 100vh;
}

.lab-shell {
  padding: 42px 0 64px;
}

.lab-heading {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  align-items: end;
  margin-bottom: 28px;
}

.lab-heading h1 {
  margin: 8px 0 12px;
  font-size: clamp(2.2rem, 5vw, 4.2rem);
}

.lab-heading .lead {
  max-width: 760px;
  margin: 0;
}

.lab-safety {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  min-width: 260px;
  max-width: 340px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
}

.lab-safety strong,
.lab-safety span {
  display: block;
}

.lab-safety span {
  color: var(--muted);
  font-size: 0.9rem;
}

.lab-safety-dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--teal) 14%, transparent);
}

.lab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.92fr);
  gap: 18px;
}

.lab-panel {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: 0 12px 30px rgba(17, 24, 39, 0.04);
}

.lab-editor-panel,
.lab-visualizer-panel,
.lab-console-panel,
.lab-contract-panel {
  padding: 20px;
}

.lab-console-panel,
.lab-contract-panel {
  grid-column: 1 / -1;
}

.lab-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
}

.lab-panel-header h2,
.lab-contract-panel h2 {
  margin: 4px 0 0;
  font-size: 1.5rem;
}

.lab-kicker {
  color: var(--teal-dark);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lab-runtime-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lab-runtime-control label,
.lab-input-row label {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.lab-runtime-control select,
.lab-input-row input,
.lab-input-row textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  font: inherit;
}

.lab-runtime-control select {
  width: auto;
  min-width: 112px;
  padding: 8px 28px 8px 10px;
}

.lab-filebar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-bottom: 0;
  border-radius: 10px 10px 0 0;
  background: var(--band);
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.82rem;
}

#source {
  display: block;
  width: 100%;
  min-height: 420px;
  resize: vertical;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 0 0 10px 10px;
  outline: none;
  background: #111827;
  color: #e5edf4;
  tab-size: 2;
  font: 14px/1.55 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

#source:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--teal) 14%, transparent);
}

.lab-input-row {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 12px;
  margin-top: 14px;
}

.lab-input-row > div {
  min-width: 0;
}

.lab-input-row input,
.lab-input-row textarea {
  display: block;
  margin-top: 6px;
  padding: 10px 11px;
}

.lab-input-row textarea {
  resize: vertical;
  min-height: 72px;
}

.lab-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
}

.lab-actions .button[disabled] {
  cursor: not-allowed;
  opacity: 0.5;
}

.lab-run-state {
  color: var(--muted);
  font-size: 0.88rem;
}

.lab-text-button {
  border: 0;
  background: transparent;
  color: var(--teal-dark);
  cursor: pointer;
  font: inherit;
  font-weight: 750;
}

.lab-runtime-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 18px;
}

.lab-runtime-card {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
}

.lab-runtime-card strong,
.lab-runtime-card span {
  display: block;
}

.lab-runtime-card span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.82rem;
}

.lab-runtime-card.is-ready {
  border-color: color-mix(in srgb, var(--teal) 40%, var(--line));
}

.lab-runtime-card.is-unavailable {
  opacity: 0.72;
}

.lab-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 2px 0 2px 4px;
}

.lab-timeline::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 11px;
  width: 1px;
  background: var(--line);
}

.lab-timeline li {
  position: relative;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 12px;
  padding: 8px 0;
}

.timeline-node {
  position: relative;
  z-index: 1;
  width: 15px;
  height: 15px;
  margin-top: 3px;
  border: 3px solid var(--panel);
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 1px var(--line);
}

.lab-timeline strong,
.lab-timeline span {
  display: block;
}

.lab-timeline span {
  color: var(--muted);
  font-size: 0.84rem;
}

.lab-timeline li.is-error .timeline-node {
  background: var(--rose);
}

.lab-job-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 18px;
}

.lab-job-meta > div {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
}

.lab-job-meta span,
.lab-job-meta strong {
  display: block;
}

.lab-job-meta span {
  color: var(--muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.lab-job-meta strong {
  margin-top: 3px;
  overflow-wrap: anywhere;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.84rem;
}

#job-id {
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--muted);
  white-space: nowrap;
}

.lab-console-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.lab-console-grid section {
  min-width: 0;
}

.lab-console-grid h3 {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.lab-console-grid pre {
  min-height: 180px;
  max-height: 420px;
  overflow: auto;
  margin: 0;
  padding: 14px;
  border-radius: 10px;
  background: #10151d;
  color: #dce6ef;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

#stderr:not(:empty) {
  color: #f3c0ca;
}

.lab-contract-panel {
  display: grid;
  grid-template-columns: minmax(220px, 0.42fr) minmax(0, 1.58fr);
  gap: 24px;
}

.lab-contract-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.lab-contract-grid > div {
  padding: 12px;
  border-left: 3px solid var(--teal);
  background: var(--paper);
}

.lab-contract-grid strong,
.lab-contract-grid span {
  display: block;
}

.lab-contract-grid span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .lab-heading {
    display: grid;
    align-items: start;
  }

  .lab-grid,
  .lab-contract-panel {
    grid-template-columns: 1fr;
  }

  .lab-console-panel,
  .lab-contract-panel {
    grid-column: auto;
  }

  .lab-safety {
    max-width: none;
  }
}

@media (max-width: 640px) {
  .lab-shell {
    padding-top: 28px;
  }

  .lab-input-row,
  .lab-console-grid,
  .lab-runtime-cards,
  .lab-job-meta,
  .lab-contract-grid {
    grid-template-columns: 1fr;
  }

  .lab-panel-header {
    align-items: flex-start;
  }

  #source {
    min-height: 340px;
  }
}


.lab-sam-panel {
  grid-column: 1 / -1;
  padding: 20px;
}

.lab-sam-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lab-sam-connection {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 750;
}

.lab-sam-connection::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--muted);
}

.lab-sam-connection.is-online::before {
  background: var(--teal);
}

.lab-sam-connection.is-offline::before {
  background: var(--rose);
}

.lab-sam-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.lab-sam-summary > div {
  min-width: 0;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--paper);
}

.lab-sam-summary span,
.lab-sam-summary strong {
  display: block;
}

.lab-sam-summary span {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.lab-sam-summary strong {
  margin-top: 4px;
  overflow-wrap: anywhere;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9rem;
}

.lab-sam-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.lab-sam-grid section {
  min-width: 0;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
}

.lab-sam-grid h3 {
  margin: 0 0 7px;
  font-size: 0.86rem;
}

.lab-sam-grid p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.lab-activity-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 0.88rem;
}

.lab-activity-list li + li {
  margin-top: 5px;
}

.lab-sam-cli {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.lab-sam-cli code {
  padding: 6px 8px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--band);
  color: var(--ink);
  font-size: 0.78rem;
}

@media (max-width: 760px) {
  .lab-sam-summary,
  .lab-sam-grid {
    grid-template-columns: 1fr;
  }

  .lab-sam-actions {
    align-items: flex-end;
    flex-direction: column;
  }
}