.calculations-view { max-width: 1280px; margin: 0 auto; padding: 22px 18px 40px; }
.calculations-heading { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin-bottom: 20px; }
.calculations-heading h1 { margin: 4px 0 0; font-size: 28px; }
.calculations-heading p:not(.eyebrow) { max-width: 510px; margin: 0; color: var(--muted); line-height: 1.6; font-size: 14px; }
.calculations-layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 20px; align-items: start; }
.calculation-tabs { display: grid; gap: 5px; padding: 10px; }
.calculation-tabs button { display: grid; grid-template-columns: 26px 1fr; align-items: center; gap: 10px; border-color: transparent; background: transparent; min-height: 55px; padding: 10px; text-align: left; font-size: 13px; line-height: 1.4; }
.calculation-tabs button > span { font-size: 11px; color: var(--muted); font-variant-numeric: tabular-nums; }
.calculation-tabs button.is-active { color: var(--accent-dark); background: #e7f3f3; border-color: #b9d9dc; font-weight: 700; }
.calculation-tabs button.is-active > span { color: var(--accent-dark); }
.calculation-tabs button:hover { border-color: var(--accent); }
.calculation-panels { min-width: 0; }
.calculation-panel { padding: 24px; }
.calculation-panel h2 { margin: 0 0 8px; font-size: 22px; }
.calculation-intro { margin: 0 0 22px; color: var(--muted); line-height: 1.6; font-size: 14px; }
.calculation-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.calculation-form label { display: flex; flex-direction: column; gap: 7px; min-width: 0; font-size: 13px; font-weight: 600; }
.calculation-form input, .calculation-form select { width: 100%; min-width: 0; min-height: 46px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 7px; background: #fff; color: var(--ink); font-size: 16px; }
.calculation-form input:focus, .calculation-form select:focus { outline: 2px solid #99cdd2; outline-offset: 1px; }
.calculation-form label[data-air-flow="true"] { grid-column: 1 / -1; color: #1d4ed8; }
.calculation-form label[data-air-flow="true"] input { border: 2px solid #2563eb; background: #f4f8ff; }
.calculation-form label[data-air-flow="true"] input:focus { outline: 2px solid #93c5fd; outline-offset: 2px; }
.calculation-form label[data-air-flow="true"] input[aria-invalid="true"] { border-color: var(--warn); }
.calculation-airflow-row { grid-column:1 / -1; display:flex; align-items:flex-start; gap:18px; }
.calculation-airflow-row > label { flex:1 1 55%; }
.calculation-next-actions { flex:1 1 45%; display:grid; gap:7px; padding-top:23px; }
.calculation-next-actions [data-calc-next-status] { font-size:12px; line-height:1.5; }
.calculation-history-card { margin:20px 0; padding:20px; border:1px solid #c5d9e9; border-radius:12px; background:#f8fbff; }
.calculation-history-card header { display:flex; justify-content:space-between; flex-wrap:wrap; gap:8px; }
.calculation-history-card h4 { margin:0; font-size:17px; }
.calculation-history-inputs { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:10px 18px; margin:18px 0; }
.calculation-history-inputs div { min-width:0; }
.calculation-history-inputs dt { font-size:12px; color:var(--muted); }
.calculation-history-inputs dd { margin:4px 0 0; font-weight:600; overflow-wrap:anywhere; }
.calculation-history-actions { display:flex; flex-wrap:wrap; gap:8px; margin-top:16px; }
@media(max-width:600px) { .calculation-airflow-row { flex-direction:column; align-items:stretch; } .calculation-next-actions { padding-top:0; } .calculation-history-inputs { grid-template-columns:1fr; } }
.calculation-form input[aria-invalid="true"] { border-color: var(--warn); }
.calculation-form label[data-calc-toggle="true"] { flex-direction:row; align-items:center; padding:12px; border:1px solid #bfdbfe; border-radius:8px; background:#eff6ff; }
.calculation-form label[data-calc-toggle="true"] input { order:-1; width:20px; min-height:20px; height:20px; margin:0 5px 0 0; accent-color:#2563eb; }
.calculation-form small { color: var(--muted); font-weight: 400; font-size: 11px; line-height: 1.4; }
.calculation-result { margin-top: 24px; }
.calculation-primary { padding: 20px; border-radius: 10px; background: #e7f3f3; border: 1px solid #c0dfe1; }
.calculation-primary span { display: block; color: var(--accent-dark); font-size: 13px; }
.calculation-primary strong { display: block; margin-top: 7px; color: var(--accent-dark); font-size: clamp(25px, 4vw, 36px); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.calculation-metrics { margin: 14px 0 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 18px; }
.calculation-metrics div { padding: 12px 0; border-bottom: 1px solid var(--line); min-width: 0; }
.calculation-metrics dt { color: var(--muted); font-size: 12px; margin-bottom: 5px; }
.calculation-metrics dd { margin: 0; font-size: 16px; font-weight: 600; overflow-wrap: anywhere; font-variant-numeric: tabular-nums; }
.calculation-warning, .calculation-error { padding: 12px 14px; border-radius: 7px; line-height: 1.5; font-size: 13px; background: #fff4e5; color: #794a0d; }
.calculation-error { background: #fff0eb; color: #8c3425; }
.calculation-method { margin-top: 20px; border-top: 1px solid var(--line); padding-top: 14px; color: var(--muted); font-size: 12px; line-height: 1.6; }
.calculation-method summary { cursor: pointer; color: var(--ink); font-weight: 600; }
.calculation-method a { color: var(--accent-dark); }
.calculation-actions { display: flex; justify-content: flex-end; margin-top: 18px; }
.calculation-actions button { font-size: 12px; color: var(--muted); }
.calculation-disclaimer { color: var(--muted); line-height: 1.5; font-size: 11px; margin: 18px 0 0; }
.calculation-insulation { grid-column: 1 / -1; margin: 8px 0 0; padding: 16px; min-width: 0; border: 1px solid var(--line); border-radius: 9px; }
.calculation-insulation legend { padding: 0 7px; font-weight: 700; }
.calculation-insulation > p, .calculation-layer-results > p { margin: 0 0 14px; color: var(--muted); font-size: 12px; line-height: 1.6; }
.calculation-layer { padding: 14px; margin-bottom: 12px; border-radius: 8px; background: #f4f8f8; border: 1px solid var(--line); }
.calculation-layer-heading { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-bottom: 12px; }
.calculation-layer-heading strong { color: var(--accent-dark); font-size: 13px; }
.calculation-layer-actions { display: flex; gap: 5px; }
.calculation-layer-actions button { min-width: 38px; padding: 0 10px; font-size: 12px; }
.calculation-layer-actions button:disabled { cursor: default; opacity: 0.4; }
.calculation-layer-fields { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr); gap: 12px; }
.calculation-layer-fields input[readonly], .calculation-surface-fields input[readonly] { color: var(--muted); background: #eaf0f1; }
.calculation-layer-results { margin-top: 22px; }
.calculation-layer-results h3 { font-size: 16px; margin: 0 0 8px; }
.calculation-layer-table-wrap { max-width: 100%; overflow-x: auto; border: 1px solid var(--line); border-radius: 8px; }
.calculation-layer-table { width: 100%; min-width: 620px; border-collapse: collapse; font-size: 12px; }
.calculation-layer-table th, .calculation-layer-table td { padding: 10px; border-bottom: 1px solid var(--line); text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
.calculation-layer-table th:first-child { text-align: left; }
.calculation-layer-table thead th { color: var(--accent-dark); background: #edf5f5; }
.calculation-layer-table tbody tr:last-child > * { border-bottom: 0; }
.calculation-surface-hint, .calculation-surface-list, .calculation-surface-empty, .calculation-surface-toolbar { grid-column: 1 / -1; min-width: 0; }
.calculation-surface-hint, .calculation-surface-empty { margin: 0; font-size: 13px; line-height: 1.6; color: var(--muted); }
.calculation-surface-row { padding: 16px; margin-bottom: 14px; border: 1px solid var(--line); border-radius: 9px; background: #f4f8f8; }
.calculation-surface-row:last-child { margin-bottom: 0; }
.calculation-surface-fields { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.calculation-surface-row-result { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 14px; font-size: 13px; color: var(--accent-dark); }
.calculation-surface-row-result > small { flex-basis: 100%; color: var(--muted); }
.calculation-surface-row-result .calculation-error { width: 100%; margin: 0; }
.calculation-surface-totals { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.calculation-surface-totals .calculation-primary strong { font-size: clamp(24px, 3vw, 32px); }
.calculation-surface-total-mass { grid-column: 1 / -1; }
.calculation-surface-group-table { min-width: 530px; }
@media (max-width: 1000px) {
  .calculation-surface-fields { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .calculation-layer-fields { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .calculation-layer-fields > label:first-child { grid-column: 1 / -1; }
}
@media (max-width: 800px) {
  .calculations-layout { grid-template-columns: 1fr; gap: 14px; }
  .calculations-heading { display: block; }
  .calculations-heading p:not(.eyebrow) { margin-top: 10px; }
  .calculation-tabs { display: flex; overflow-x: auto; gap: 6px; padding: 8px; scroll-snap-type: x proximity; }
  .calculation-tabs button { flex: 0 0 174px; scroll-snap-align: start; min-height: 62px; }
  .calculation-panel { padding: 18px; }
}
@media (max-width: 480px) {
  .calculations-view { padding: 16px 10px 30px; }
  .calculation-form { grid-template-columns: 1fr; gap: 14px; }
  .calculation-panel h2 { font-size: 20px; }
  .calculation-metrics { gap: 0 12px; }
  .calculation-insulation { padding: 12px; }
  .calculation-layer { padding: 10px; }
  .calculation-layer-fields { grid-template-columns: 1fr; }
  .calculation-surface-fields, .calculation-surface-totals { grid-template-columns: 1fr; }
  .calculation-surface-row { padding: 12px; }
}
@media print { .calculations-view { display: none !important; } }
 .calculation-notebook { margin-top:28px; padding-top:20px; border-top:1px solid #d8e0e8; }
 .calculation-notebook-toolbar { display:flex; align-items:end; gap:10px; flex-wrap:wrap; }
 .calculation-notebook-toolbar label { display:grid; gap:6px; flex:1 1 260px; }
 .calculation-notebook-scroll { overflow-x:auto; margin:16px 0; }
 .calculation-notebook table { width:100%; border-collapse:collapse; min-width:550px; }
 .calculation-notebook td, .calculation-notebook th { padding:10px; text-align:left; border-bottom:1px solid #d8e0e8; }
 .calculation-notebook td small, .calculation-notebook td strong { display:block; }
 .calculation-notebook td button { margin:3px; }