.curtain-calculator {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(250px, .8fr);
  margin-bottom: 24px;
  overflow: hidden;
  border: 1px solid #cad8dc;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 12px 30px rgba(24, 43, 51, .07);
}
.curtain-inputs, .curtain-results { padding: 28px; }
.curtain-results { border-left: 1px solid #d7e1e4; background: #f3f8f7; }
.curtain-section-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }
.curtain-section-head h2 { margin: 2px 0 18px; }
.unit-choice { display: flex; gap: 8px; margin: 0 0 22px; padding: 0; border: 0; }
.unit-choice legend { margin-bottom: 8px; color: #445861; font-size: .86rem; font-weight: 700; }
.unit-choice label { position: relative; }
.unit-choice input { position: absolute; opacity: 0; pointer-events: none; }
.unit-choice span { display: block; min-width: 108px; padding: 9px 14px; border: 1px solid #b9c9ce; background: #fff; color: #28434d; text-align: center; cursor: pointer; }
.unit-choice label:first-of-type span { border-radius: 6px 0 0 6px; }
.unit-choice label:last-of-type span { margin-left: -9px; border-radius: 0 6px 6px 0; }
.unit-choice input:checked + span { position: relative; border-color: #086b5d; background: #086b5d; color: #fff; }
.unit-choice input:focus-visible + span { outline: 3px solid rgba(8,107,93,.24); outline-offset: 2px; }
.curtain-field-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.curtain-field-grid > label { display: grid; gap: 7px; color: #314852; font-weight: 700; }
.curtain-field-grid input { width: 100%; min-width: 0; height: 46px; padding: 0 13px; border: 1px solid #b9c9ce; border-radius: 5px; background: #fff; color: #152b33; font: inherit; }
.curtain-field-grid input:focus { border-color: #087a69; outline: 3px solid rgba(8,122,105,.14); }
.curtain-input-wrap { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: center; }
.curtain-input-wrap input { grid-area: 1/1/2/3; padding-right: 52px; }
.curtain-input-wrap > span { z-index: 1; grid-area: 1/2; padding-right: 13px; color: #60747c; font-weight: 600; }
.field-help { margin: 16px 0 0; color: #60747c; font-size: .92rem; line-height: 1.55; }
.curtain-error { margin: 14px 0 0; padding: 10px 12px; border-left: 4px solid #b42318; background: #fff1f0; color: #8f1d15; }
.curtain-primary-result { margin: 12px 0 24px; }
.curtain-primary-result strong { display: block; color: #086b5d; font-size: clamp(2.55rem, 5vw, 4rem); line-height: 1; }
.curtain-primary-result span { display: block; margin-top: 7px; color: #364d56; font-weight: 700; }
.curtain-result-list { display: grid; gap: 0; margin: 0; }
.curtain-result-list div { display: flex; justify-content: space-between; gap: 20px; padding: 13px 0; border-top: 1px solid #cfdddf; }
.curtain-result-list dt { color: #50656e; }
.curtain-result-list dd { margin: 0; color: #142b34; font-weight: 800; text-align: right; }
.curtain-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; }
.curtain-actions button, #curtain-reset {
  min-height: 40px;
  padding: 9px 15px;
  border: 1px solid #9eb4ba;
  border-radius: 5px;
  background: #fff;
  color: #173841;
  font: inherit;
  font-weight: 750;
  cursor: pointer;
}
.curtain-actions .primary-button {
  border-color: #086b5d;
  background: #086b5d;
  color: #fff;
}
.curtain-actions button:hover, #curtain-reset:hover { border-color: #086b5d; background: #eaf4f1; }
.curtain-actions .primary-button:hover { background: #075a4f; color: #fff; }
.curtain-actions button:focus-visible, #curtain-reset:focus-visible { outline: 3px solid rgba(8,107,93,.24); outline-offset: 2px; }
.curtain-status { min-height: 1.4em; margin: 10px 0 0; color: #086b5d; font-size: .9rem; }
.curtain-mark-list { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 8px; margin: 18px 0; padding: 0; list-style: none; counter-reset: marks; }
.curtain-mark-list li { counter-increment: marks; padding: 10px 11px; border: 1px solid #d3dee1; border-radius: 5px; background: #f7faf9; color: #26424c; font-variant-numeric: tabular-nums; }
.curtain-mark-list li::before { content: counter(marks) ". "; color: #6a7c83; font-weight: 700; }
.curtain-ruler { position: relative; height: 118px; margin-top: 26px; border: 1px solid #b9c9ce; border-radius: 6px; background: repeating-linear-gradient(to right,#edf4f2 0,#edf4f2 1px,transparent 1px,transparent 5%); overflow: hidden; }
.curtain-ruler::before { content: ""; position: absolute; left: 4%; right: 4%; top: 58px; height: 4px; background: #29434d; }
.curtain-ruler-mark { position: absolute; top: 41px; width: 2px; height: 38px; background: #087a69; transform: translateX(-1px); }
.curtain-ruler-mark::before { content: ""; position: absolute; left: -4px; top: -4px; width: 10px; height: 10px; border-radius: 50%; background: #087a69; }
.curtain-ruler-mark span { position: absolute; top: 42px; left: 50%; min-width: 64px; color: #496068; font-size: .72rem; text-align: center; transform: translateX(-50%); }
.curtain-method-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 26px; }
.curtain-method-grid article { min-width: 0; }
.curtain-method-grid h3 { margin-top: 0; }
.curtain-method-grid code { display: block; padding: 12px; border-radius: 5px; background: #edf4f2; color: #17463f; white-space: normal; }
.curtain-method-grid ol { margin: 0; padding-left: 22px; }
.curtain-method-grid li + li { margin-top: 9px; }
.curtain-reference-list { display: grid; gap: 8px; margin-top: 18px; }
.curtain-reference-list a { width: fit-content; font-weight: 700; }
@media (max-width: 850px) {
  .curtain-calculator { grid-template-columns: 1fr; }
  .curtain-results { border-top: 1px solid #d7e1e4; border-left: 0; }
  .curtain-mark-list { grid-template-columns: repeat(3,minmax(0,1fr)); }
}
@media (max-width: 560px) {
  .curtain-inputs, .curtain-results { padding: 20px; }
  .curtain-field-grid, .curtain-method-grid { grid-template-columns: 1fr; }
  .curtain-section-head { align-items: center; }
  .curtain-mark-list { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .curtain-ruler-mark span { display: none; }
}
@media print {
  .site-header,.breadcrumbs,.tool-sidebar,.related-tools,.site-footer,.curtain-actions,.unit-choice,.curtain-field-grid,.field-help,#guidance,#faq { display: none !important; }
  .tool-page-grid,.curtain-calculator { display: block; }
  .curtain-results { border: 0; }
  .content-panel,.curtain-calculator { box-shadow: none; }
}