.engineering {
  --lab-gap: clamp(1rem, 3vw, 2rem);
}
.engineering h1 {
  font-size: clamp(2.3rem, 6vw, 4.8rem);
  line-height: 1.05;
  max-width: 16ch;
}
.engineering section {
  scroll-margin-top: 7rem;
}
.lab-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--lab-gap);
  align-items: start;
}
.lab-grid > * {
  min-width: 0;
}
.engineering .buffer-panel {
  margin-top: 2rem;
}
.engineering label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-width: 0;
  font-weight: 650;
}
.engineering select,
.engineering
  input:not([type="radio"]):not([type="checkbox"]):not([type="color"]),
.engineering textarea {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  background: var(--bg);
  color: var(--ink);
  padding: 0.65rem;
  font: inherit;
  box-sizing: border-box;
}
.engineering textarea,
.engineering pre {
  font-family: ui-monospace, monospace;
  font-size: 0.85rem;
  line-height: 1.7;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.engineering textarea {
  resize: vertical;
}
.engineering button {
  min-height: 44px;
  white-space: normal;
  overflow-wrap: anywhere;
}
.lab-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin: 1rem 0;
}
.lab-actions > * {
  flex: 0 1 auto;
}
.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 1rem 0;
}
.field-grid small {
  font-weight: 400;
  overflow-wrap: anywhere;
}
.lab-output {
  padding: 1rem;
  border-left: 3px solid var(--accent);
  background: var(--bg);
  border-radius: 0.4rem;
  overflow-wrap: anywhere;
}
.lab-path {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.65rem;
  counter-reset: step;
}
.lab-path li {
  counter-increment: step;
  display: flex;
  gap: 0.8rem;
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: 0.7rem;
  align-items: center;
  min-height: 3rem;
}
.lab-path li::before {
  content: counter(step, decimal-leading-zero);
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  font-weight: 750;
}
.lab-path li.current {
  border-color: var(--accent);
  background: var(--bg);
}
.lab-badge {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  padding: 0.3rem 0.55rem;
  border-radius: 1rem;
}
.engineering table {
  width: 100%;
}
.engineering td,
.engineering th {
  overflow-wrap: anywhere;
}
.engineering details > summary {
  display: flex;
  width: 100%;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  box-sizing: border-box;
  cursor: pointer;
  min-height: 48px;
  padding: 1rem;
  font-weight: 700;
}
.engineering details > summary::after {
  content: "+";
  font-size: 1.4rem;
}
.engineering details[open] > summary::after {
  content: "−";
}
.engineering[data-depth="beginner"] .engineering-detail,
.engineering:not([data-depth="spec"]) .spec-detail {
  display: none;
}
.engineering .table-scroll {
  max-width: 100%;
  overflow: auto;
}
.engineering :focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}
@media (max-width: 720px) {
  .lab-grid {
    grid-template-columns: 1fr;
  }
  .field-grid {
    grid-template-columns: 1fr;
  }
  .lab-actions > button {
    flex: 1 1 45%;
  }
  .engineering .buffer-panel {
    padding: 1rem;
  }
  .engineering h2 {
    font-size: clamp(1.5rem, 7vw, 2rem);
  }
}
@media (prefers-reduced-motion: reduce) {
  .engineering * {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

.engineering button {
  background: var(--soft);
  border: 1px solid var(--accent);
  border-radius: 0.6rem;
  padding: 0.65rem 0.9rem;
  color: var(--ink);
}

.engineering li { overflow-wrap: anywhere; }