.engineering-page {
  padding: 10rem 5vw 5rem;
  background: #f2efe8;
  color: #17232b;
}
.duct-suggested-section { grid-column: 1 / -1; margin-top: 1rem; padding: 1.25rem; background: #f6eadb; border: 1px solid rgba(23,35,43,.18); }
.duct-suggested-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin: .5rem 0 1rem; }
.duct-suggested-grid span { display: flex; flex-direction: column; gap: .25rem; font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; }
.duct-suggested-grid strong { font-size: 1.25rem; color: #17232b; text-transform: none; letter-spacing: 0; }
.duct-warning { grid-column: 1 / -1; color: #8a5a00; background: #fff4cc; border-left: 3px solid #d99a20; padding: .75rem; }
.duct-dimension-note { grid-column: 1 / -1; font-size: .82rem; color: #59636a; }
@media (max-width: 700px) { .duct-suggested-grid { grid-template-columns: 1fr; } }
.tools-intro {
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  gap: 3rem;
  align-items: end;
  max-width: 1280px;
  margin: auto auto 4rem;
}
.tools-intro h1 {
  font-size: clamp(3.2rem, 7vw, 7.7rem);
  line-height: 0.88;
  letter-spacing: -0.065em;
  margin: 0.4rem 0 1.2rem;
}
.tools-intro h1 span {
  color: #f4513a;
}
.tools-intro > div > p:last-child {
  font-size: 1.15rem;
  max-width: 42rem;
}
.tools-back {
  justify-self: end;
  color: inherit;
  border-bottom: 1px solid currentColor;
  padding-bottom: 0.35rem;
}
.tools-tabs {
  max-width: 1280px;
  margin: auto;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border: 1px solid #c8c4b9;
}
.tools-tabs button {
  background: transparent;
  border: 0;
  border-right: 1px solid #c8c4b9;
  padding: 1.3rem;
  text-align: left;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.tools-tabs button:last-child {
  border: 0;
}
.tools-tabs button span {
  color: #f4513a;
  margin-right: 0.8rem;
}
.tools-tabs button[aria-selected="true"] {
  background: #17232b;
  color: #fff;
}
.tool-pane {
  max-width: 1280px;
  margin: auto;
  padding: 4rem 0;
}
.converter-layout,
.sizer-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.converter-inputs,
.sizer-form {
  background: #fff;
  padding: clamp(1.5rem, 4vw, 3.5rem);
}
.converter-result,
.sizer-result {
  background: #17232b;
  color: #fff;
  padding: clamp(1.5rem, 4vw, 3.5rem);
}
.tool-description {
  margin-bottom: 2rem;
}
.tool-field {
  display: grid;
  gap: 0.45rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}
.tool-field input,
.tool-field select {
  width: 100%;
  padding: 1rem;
  border: 1px solid #bbb7ac;
  background: #fff;
  color: #17232b;
  font: 500 1rem/1.2 inherit;
}
.converter-values,
.conversion-target,
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1rem 0;
}
.conversion-target {
  grid-template-columns: 1fr auto;
  align-items: end;
}
.swap-button,
.copy-button {
  border: 1px solid currentColor;
  background: transparent;
  color: inherit;
  padding: 1rem;
  cursor: pointer;
}
.converter-result output {
  display: block;
  font-size: clamp(3rem, 7vw, 6.5rem);
  font-weight: 800;
  line-height: 1;
  margin-top: 2rem;
  word-break: break-word;
}
.converter-result > span:not(.eyebrow) {
  font-size: 1.25rem;
}
.conversion-reference {
  margin-top: 2.5rem;
  border-top: 1px solid #ffffff33;
  padding-top: 1.5rem;
}
.conversion-reference dl {
  display: grid;
  gap: 0.5rem;
}
.conversion-reference dl div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}
.quick-conversions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}
.quick-conversions button {
  border: 1px solid #aaa59a;
  border-radius: 99px;
  padding: 0.7rem 1rem;
  background: transparent;
  cursor: pointer;
}
.sizer-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: end;
  margin-bottom: 2rem;
}
.sizer-intro h2 {
  font-size: clamp(2.6rem, 5vw, 5rem);
  line-height: 0.95;
}
.full-field {
  grid-column: 1/-1;
}
.assumptions {
  margin: 1rem 0;
  border-top: 1px solid #ccc;
  border-bottom: 1px solid #ccc;
  padding: 1rem 0;
}
.assumptions summary,
.tool-method summary {
  cursor: pointer;
  font-weight: 700;
}
.button-dark {
  margin-top: 1rem;
}
.sizer-result h3 {
  font-size: clamp(2.4rem, 5vw, 5rem);
  margin: 1.5rem 0;
}
.result-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 2rem 0;
}
.result-metrics div {
  border-top: 1px solid #ffffff33;
  padding-top: 0.8rem;
  display: grid;
  gap: 0.25rem;
}
.method-readout,
.result-caveat {
  font-size: 0.85rem;
  color: #cdd4d7;
}
.candidate-table-wrap {
  overflow: auto;
  margin: 2rem 0;
}
.candidate-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}
.candidate-table caption {
  text-align: left;
  padding: 1rem;
  font-weight: 700;
}
.candidate-table th,
.candidate-table td {
  text-align: left;
  padding: 1rem;
  border-top: 1px solid #ddd;
}
.candidate-table .pass {
  color: #087b56;
  font-weight: 700;
}
.tool-method {
  background: #e6e2d8;
  padding: 1.3rem;
  margin-top: 2rem;
}
.tool-method > div {
  max-width: 60rem;
  padding-top: 1rem;
}
.tools-contact {
  max-width: 1280px;
  margin: 2rem auto 0;
  background: #f4513a;
  color: #17232b;
  padding: clamp(2rem, 5vw, 5rem);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}
.tools-contact h2 {
  font-size: clamp(2.5rem, 5vw, 5rem);
}
.tools-contact > div:last-child {
  display: grid;
  align-content: end;
}
.tools-contact a {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid #17232b;
  padding: 1rem 0;
  color: inherit;
}
.tool-error {
  color: #b42318;
}
.tool-note,
.tool-footnote {
  font-size: 0.85rem;
  color: #636b6e;
}
.copy-status {
  margin-left: 0.7rem;
}
.noscript-note {
  padding: 1rem;
  background: #fff0c7;
}
.site-footer {
  padding: 2rem 5vw;
}
.discipline-map {
  max-width: 1280px;
  margin: 0 auto 1rem;
  display: grid;
  grid-template-columns: 1.25fr 1fr 1fr;
  gap: 1px;
  background: #c8c4b9;
  border: 1px solid #c8c4b9;
}
.discipline-map div { background: #e7e3da; padding: 1rem; display: grid; gap: 0.35rem; }
.discipline-map span { font-size: 0.72rem; letter-spacing: 0.1em; color: #f4513a; font-weight: 800; }
.discipline-map strong { font-size: 0.92rem; }
.energy-strip { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 1rem; align-items: end; background: #d7ff63; padding: clamp(1.5rem, 4vw, 3rem); margin-top: 1.5rem; }
.energy-strip h3 { font-size: clamp(1.4rem, 2.5vw, 2.2rem); }
.energy-strip output { font-size: 1.3rem; font-weight: 800; padding-bottom: 1rem; }
@media (max-width: 760px) {
  .engineering-page {
    padding-top: 8rem;
  }
  .tools-intro,
  .converter-layout,
  .sizer-layout,
  .sizer-intro,
  .tools-contact {
    grid-template-columns: 1fr;
  }
  .discipline-map,
  .energy-strip {
    grid-template-columns: 1fr;
  }
  .tools-back {
    justify-self: start;
  }
  .tools-tabs {
    grid-template-columns: 1fr;
  }
  .tools-tabs button {
    border-right: 0;
    border-bottom: 1px solid #c8c4b9;
  }
  .converter-values,
  .form-grid {
    grid-template-columns: 1fr;
  }
  .full-field {
    grid-column: auto;
  }
  .result-metrics {
    grid-template-columns: 1fr;
  }
}