[data-spring-tool] {
  --spring-navy: #001449;
  --spring-blue: #00288e;
  --spring-accent: #145bc6;
  --spring-muted: #56647a;
  --spring-line: #dce2eb;
  --spring-panel: #f5f7fa;
  color: var(--spring-navy);
  font-family: var(--etar-font-family, Inter, Arial, sans-serif);
  padding-bottom: clamp(62px, 8vw, 116px);
}
[data-spring-tool] *, [data-spring-tool] *::before, [data-spring-tool] *::after { box-sizing: border-box; }
[data-spring-tool] [hidden] { display: none !important; }
.spring-crumb { display: flex; align-items: center; flex-wrap: wrap; gap: 11px; padding-block: 25px; color: var(--spring-muted); font: 500 12px/1.4 var(--etar-font-family, Inter, Arial, sans-serif); }
.spring-crumb a:hover { color: var(--spring-blue); text-decoration: underline; text-underline-offset: 4px; }
.spring-tool-heading { max-width: 900px; padding-block: clamp(23px,4vw,54px) 34px; }
.spring-tool-heading .eyebrow, .spring-scope-section .eyebrow, .spring-method .eyebrow { margin: 0 0 17px; color: var(--spring-blue); font: 600 11px/1.4 var(--etar-font-family, Inter, Arial, sans-serif); letter-spacing: .13em; }
.spring-tool-heading h1 { max-width: 820px; margin: 0 0 20px; font: 500 clamp(41px,6vw,72px)/1.02 var(--etar-font-family, Inter, Arial, sans-serif); letter-spacing: -.055em; }
.spring-tool-lead { max-width: 720px; margin: 0; color: var(--spring-muted); font-size: clamp(17px,2vw,20px); line-height: 1.65; }
.spring-type-switch { display: flex; gap: 10px; margin-top: 31px; }
.spring-type-switch button, .spring-mode-switch button { min-height: 47px; border: 1px solid var(--spring-line); border-radius: 7px; padding: 10px 17px; background: #fff; color: var(--spring-navy); font: 600 14px/1.35 var(--etar-font-family, Inter, Arial, sans-serif); transition: border-color .16s ease, background .16s ease, color .16s ease; }
.spring-type-switch button { display: inline-flex; align-items: center; gap: 11px; }
.spring-type-switch button:hover, .spring-mode-switch button:hover { border-color: #8297b8; }
.spring-type-switch button[aria-pressed="true"], .spring-mode-switch button[aria-pressed="true"] { border-color: var(--spring-navy); background: var(--spring-navy); color: #fff; }
.spring-type-symbol { font-size: 20px; line-height: 1; }
.spring-tool-layout { display: grid; grid-template-columns: minmax(0, .92fr) minmax(0, 1.16fr); align-items: start; gap: 19px; }
.spring-input-card, .spring-results-card { min-width: 0; overflow: hidden; border: 1px solid var(--spring-line); border-radius: 14px; background: #fff; box-shadow: 0 7px 26px rgb(0 20 73 / 4%); }
.spring-input-card { padding: clamp(20px,2.3vw,31px); }
.spring-results-card { padding: clamp(20px,2.3vw,31px); }
.spring-card-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; margin-bottom: 24px; }
.spring-card-heading .eyebrow { margin: 0 0 8px; color: #61718b; font: 600 11px/1.4 var(--etar-font-family, Inter, Arial, sans-serif); letter-spacing: .12em; }
.spring-card-heading h2 { margin: 0; font: 550 clamp(23px,2.5vw,30px)/1.18 var(--etar-font-family, Inter, Arial, sans-serif); letter-spacing: -.035em; }
.spring-text-button { flex: 0 0 auto; border: 0; padding: 5px 0; background: transparent; color: var(--spring-blue); font: 600 12px/1.5 var(--etar-font-family, Inter, Arial, sans-serif); text-decoration: underline; text-decoration-color: #a9b7ca; text-underline-offset: 4px; }
.spring-mode-switch { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; margin-bottom: 21px; }
.spring-mode-switch button { min-width: 0; min-height: 43px; padding-inline: 8px; font-size: 12px; }
.spring-form-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 19px 15px; }
.spring-input-card fieldset { min-width: 0; margin: 0; border: 0; padding: 0; }
.spring-field { min-width: 0; }
.spring-field > label { display: block; margin-bottom: 8px; font: 650 13px/1.4 var(--etar-font-family, Inter, Arial, sans-serif); }
.spring-field > label > span { color: var(--spring-muted); font-size: 12px; font-weight: 500; }
.spring-field > input, .spring-field select, .spring-input-combo > input, .spring-input-combo > select, .spring-input-unit > input { display: block; width: 100%; min-width: 0; min-height: 46px; border: 1px solid #cbd4e0; border-radius: 6px; padding: 10px 12px; background-color: #fff; color: var(--spring-navy); font: 550 16px/1.25 var(--etar-font-family, Inter, Arial, sans-serif); font-variant-numeric: tabular-nums; }
.spring-field input:focus, .spring-field select:focus { border-color: var(--spring-accent); outline: 3px solid rgb(20 91 198 / 17%); outline-offset: 1px; }
.spring-field small { display: block; margin-top: 7px; color: var(--spring-muted); font-size: 11px; line-height: 1.5; }
.spring-input-combo { display: grid; grid-template-columns: minmax(68px,.82fr) minmax(105px,1.18fr); }
.spring-input-combo > input { border-radius: 6px 0 0 6px; }
.spring-input-combo > select { margin-left: -1px; border-radius: 0 6px 6px 0; padding-inline: 8px; font-size: 12px; }
.spring-input-unit { position: relative; }
.spring-input-unit > input { padding-right: 48px; }
.spring-input-unit > span { position: absolute; top: 50%; right: 12px; color: var(--spring-muted); font-size: 12px; transform: translateY(-50%); pointer-events: none; }
.spring-model-note { margin-top: 19px; border-left: 3px solid #a9bddb; padding: 10px 12px; background: var(--spring-panel); color: #43536c; font-size: 11px; line-height: 1.55; }
.spring-model-note sub { font-size: 11px; }
.spring-submit-row { display: flex; flex-wrap: wrap; align-items: center; gap: 13px 19px; margin-top: 23px; }
.spring-primary-button, .spring-secondary-button { display: inline-flex; align-items: center; justify-content: center; gap: 14px; min-height: 47px; border: 1px solid var(--spring-navy); border-radius: 6px; padding: 11px 16px; font: 650 13px/1.35 var(--etar-font-family, Inter, Arial, sans-serif); transition: background .16s ease, color .16s ease, border-color .16s ease; }
.spring-primary-button { background: var(--spring-navy); color: #fff; }
.spring-primary-button:hover:not(:disabled) { border-color: var(--spring-blue); background: var(--spring-blue); }
.spring-primary-button > span { font-size: 19px; }
.spring-primary-button:disabled, .spring-secondary-button:disabled { cursor: not-allowed; opacity: .43; }
.spring-example-button { min-height: 44px; border: 0; border-bottom: 1px solid #bdc8d8; padding: 8px 0; background: transparent; color: var(--spring-blue); font: 600 12px/1.45 var(--etar-font-family, Inter, Arial, sans-serif); }
.spring-symbol-key { margin-top: 24px; border-top: 1px solid var(--spring-line); }
.spring-symbol-key summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-block: 16px 5px; color: var(--spring-blue); cursor: pointer; font-size: 12px; font-weight: 650; list-style: none; }
.spring-symbol-key summary::-webkit-details-marker { display: none; }
.spring-symbol-key summary::after { content: "+"; font-size: 17px; font-weight: 450; }
.spring-symbol-key[open] summary::after { content: "−"; }
.spring-symbol-key dl { display: grid; grid-template-columns: 1fr 1fr; gap: 0 13px; margin: 12px 0 0; }
.spring-symbol-key dl > div { display: grid; grid-template-columns: 34px minmax(0,1fr); gap: 8px; border-top: 1px solid var(--spring-line); padding-block: 8px; font-size: 11px; }
.spring-symbol-key dt { font-weight: 700; }
.spring-symbol-key dd { margin: 0; color: var(--spring-muted); line-height: 1.45; }
.spring-result-state { flex: 0 0 auto; margin-top: 3px; border: 1px solid var(--spring-line); border-radius: 999px; padding: 5px 9px; color: var(--spring-muted); font: 550 11px/1.4 var(--etar-font-family, Inter, Arial, sans-serif); }
.spring-empty-state { display: grid; justify-items: start; min-height: 346px; align-content: center; padding: 20px 8px 27px; }
.spring-illustration { width: min(100%,265px); margin-bottom: 14px; color: #8fa8ca; }
.spring-empty-state h3 { max-width: 430px; margin-bottom: 9px; font-size: clamp(21px,2.3vw,26px); line-height: 1.2; letter-spacing: -.03em; }
.spring-empty-state p { max-width: 400px; margin: 0; color: var(--spring-muted); font-size: 14px; line-height: 1.65; }
.spring-kpi-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 9px; }
.spring-kpi-grid article { min-width: 0; border: 1px solid var(--spring-line); border-radius: 8px; padding: 14px 13px; background: var(--spring-panel); }
.spring-kpi-grid article > span, .spring-kpi-grid article > small { display: block; color: var(--spring-muted); font-size: 11px; line-height: 1.4; }
.spring-kpi-grid article > strong { display: block; overflow-wrap: anywhere; padding-block: 8px 3px; color: var(--spring-navy); font: 650 clamp(19px,2vw,25px)/1.15 var(--etar-font-family, Inter, Arial, sans-serif); font-variant-numeric: tabular-nums; letter-spacing: -.035em; }
.spring-geometry-strip { display: flex; flex-wrap: wrap; gap: 9px 22px; border-bottom: 1px solid var(--spring-line); padding: 14px 1px; color: var(--spring-muted); font-size: 11px; line-height: 1.5; }
.spring-geometry-strip > span { display: flex; flex-wrap: wrap; gap: 5px; align-items: baseline; }
.spring-geometry-strip strong { color: var(--spring-navy); font-size: 12px; font-variant-numeric: tabular-nums; }
.spring-geometry-strip small { color: var(--spring-muted); font-size: 11px; }
.spring-chart-card { margin-top: 19px; border: 1px solid var(--spring-line); border-radius: 9px; padding: 16px 15px 11px; }
.spring-chart-heading { display: flex; flex-wrap: wrap; align-items: start; justify-content: space-between; gap: 8px; }
.spring-chart-heading h3 { margin: 0 0 4px; font-size: 15px; line-height: 1.3; letter-spacing: -.02em; }
.spring-chart-heading p { margin: 0; color: var(--spring-muted); font-size: 11px; line-height: 1.5; }
.spring-chart-unit { color: var(--spring-blue); font: 600 11px/1.5 var(--etar-font-family, Inter, Arial, sans-serif); }
.spring-chart { display: block; width: 100%; height: auto; margin: 10px 0 0; overflow: visible; }
.spring-chart-gridline { fill: none; stroke: #dfe5ed; stroke-width: 1; }
.spring-chart-line { fill: none; stroke: #145bc6; stroke-linecap: round; stroke-linejoin: round; stroke-width: 3; }
.spring-chart-dot { fill: #fff; stroke: #145bc6; stroke-width: 3; }
.spring-chart text { fill: #63728a; font: 11px var(--etar-font-family, Inter, Arial, sans-serif); }
.spring-table-wrap { width: 100%; overflow-x: auto; }
.spring-points-table, .spring-compare-table { width: 100%; border-collapse: collapse; font-size: 11px; font-variant-numeric: tabular-nums; }
.spring-points-table { margin-top: 2px; }
.spring-points-table caption { padding-block: 5px 8px; color: var(--spring-muted); font-size: 11px; text-align: left; }
.spring-points-table th, .spring-points-table td { border-top: 1px solid var(--spring-line); padding: 7px 8px; text-align: right; }
.spring-points-table th:first-child, .spring-points-table td:first-child { text-align: left; }
.spring-points-table th { color: var(--spring-muted); font-weight: 600; }
.spring-warning-list { display: grid; gap: 7px; margin: 14px 0 0; padding: 0; list-style: none; }
.spring-warning-list li { border-left: 3px solid #d1a449; padding: 8px 10px; background: #fff8e9; color: #57441f; font-size: 11px; line-height: 1.55; }
.spring-result-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.spring-result-actions .spring-primary-button, .spring-result-actions .spring-secondary-button { min-height: 40px; padding: 8px 11px; font-size: 11px; }
.spring-result-actions .spring-primary-button { gap: 8px; }
.spring-secondary-button { border-color: #cbd4e0; background: #fff; color: var(--spring-blue); }
.spring-secondary-button:hover:not(:disabled) { border-color: var(--spring-blue); background: #f1f5fc; }
.spring-compare { margin-top: 25px; border-top: 1px solid var(--spring-line); padding-top: 18px; }
.spring-compare-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.spring-compare h3 { margin: 0; font-size: 16px; letter-spacing: -.02em; }
.spring-compare-heading > span { color: var(--spring-muted); font: 600 11px var(--etar-font-family, Inter, Arial, sans-serif); }
.spring-compare > p { margin: 7px 0 12px; color: var(--spring-muted); font-size: 11px; line-height: 1.55; }
.spring-compare-table { min-width: 610px; }
.spring-compare-table th, .spring-compare-table td { border-top: 1px solid var(--spring-line); padding: 8px 7px; text-align: right; white-space: nowrap; }
.spring-compare-table th:first-child, .spring-compare-table td:first-child { text-align: left; }
.spring-compare-table th { color: var(--spring-muted); font-size: 11px; font-weight: 650; }
.spring-compare-table td { font-size: 11px; }
.spring-compare-table th small { font-size: 10px; font-weight: 500; }
.spring-remove-variant { border: 0; padding: 3px; background: transparent; color: var(--spring-blue); cursor: pointer; font-size: 11px; text-decoration: underline; text-underline-offset: 3px; }
.spring-footnote { margin: 17px 0 0; border-top: 1px solid var(--spring-line); padding-top: 13px; color: var(--spring-muted); font-size: 11px; line-height: 1.6; }
.spring-inquiry-next { margin-top: 22px; border-top: 1px solid var(--spring-line); padding-top: 18px; }
.spring-inquiry-next h3 { margin: 0 0 8px; font-size: 17px; }
.spring-inquiry-next p { margin: 0 0 12px; font-size: 13px; line-height: 1.65; color: var(--spring-muted); }
.spring-error { margin: 17px 0 0; border-left: 3px solid #b53734; padding: 10px 12px; background: #fff2f1; color: #762a27; font-size: 12px; line-height: 1.55; }
.spring-action-notice { margin: 12px 0 0; border-left: 3px solid #3d8065; padding: 8px 11px; background: #edf8f2; color: #22543f; font-size: 11px; line-height: 1.5; }
.spring-action-notice--error { border-color: #b53734; background: #fff2f1; color: #762a27; }
.spring-result-mode { margin: 0 0 13px; border-left: 3px solid #a9bddb; padding: 9px 11px; background: var(--spring-panel); color: #43536c; font-size: 11px; line-height: 1.55; }
.spring-scope-section { padding-top: clamp(64px,8vw,104px); }
.spring-scope-section > header { max-width: 700px; margin-bottom: 34px; }
.spring-scope-section > header h2, .spring-method h2 { margin: 0; font: 500 clamp(29px,4vw,47px)/1.1 var(--etar-font-family, Inter, Arial, sans-serif); letter-spacing: -.045em; }
.spring-scope-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 22px; }
.spring-scope-grid article { border-top: 1px solid #9cabbf; padding-top: 17px; }
.spring-scope-number { color: var(--spring-blue); font: 600 11px var(--etar-font-family, Inter, Arial, sans-serif); }
.spring-scope-grid h3 { margin: 19px 0 9px; font-size: 19px; letter-spacing: -.025em; }
.spring-scope-grid p, .spring-method p { margin: 0; color: var(--spring-muted); font-size: 13px; line-height: 1.7; }
.spring-method { display: grid; grid-template-columns: minmax(0,1.3fr) minmax(250px,.7fr); gap: 50px; margin-top: clamp(64px,8vw,100px); border-top: 1px solid var(--spring-line); padding-top: 35px; }
.spring-method > div > p:not(.eyebrow) { max-width: 680px; margin-top: 16px; }
.spring-source-links { display: grid; grid-template-columns: 1fr 1fr; gap: 0 22px; margin-top: 20px; }
.spring-source-links a { display: flex; justify-content: space-between; gap: 12px; border-top: 1px solid var(--spring-line); padding-block: 12px; color: var(--spring-blue); font-size: 11px; line-height: 1.5; }
.spring-source-links a:hover, .spring-contact-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.spring-method aside { align-self: start; border-radius: 9px; padding: 23px; background: var(--spring-panel); }
.spring-method aside h3 { margin-bottom: 10px; font-size: 18px; letter-spacing: -.025em; }
.spring-method aside p { font-size: 12px; }
.spring-contact-link { display: flex; justify-content: space-between; gap: 12px; margin-top: 18px; color: var(--spring-blue); font-size: 12px; font-weight: 650; }
.spring-noscript { margin-top: 30px; border: 1px solid var(--spring-line); border-radius: 8px; padding: 18px; font-size: 13px; }
.spring-noscript a { color: var(--spring-blue); text-decoration: underline; text-underline-offset: 3px; }
.spring-formulas { margin-top: 25px; border: 1px solid var(--spring-line); border-radius: 8px; padding: 18px; background: var(--spring-panel); }
.spring-formulas h3 { margin-bottom: 9px; font-size: 15px; }
.spring-formulas p { margin: 0; color: var(--spring-muted); font-size: 11px; line-height: 1.7; }
.spring-formulas code { color: var(--spring-navy); font: 600 11px/1.5 var(--etar-font-family, Inter, Arial, sans-serif); }
.spring-formulas .spring-formula-definitions { margin-top: 8px; font-size: 11px; }
.spring-print-sheet { display: none; }

@media (max-width: 900px) {
  .spring-tool-layout { grid-template-columns: minmax(0,1fr); }
  .spring-input-card, .spring-results-card { padding: clamp(20px,4vw,31px); }
  .spring-empty-state { min-height: 280px; }
  .spring-method { grid-template-columns: minmax(0,1.2fr) minmax(215px,.8fr); gap: 26px; }
}
@media (max-width: 600px) {
  .spring-crumb { padding-block: 17px; font-size: 11px; }
  .spring-tool-heading { padding-top: 22px; padding-bottom: 26px; }
  .spring-tool-heading h1 { font-size: clamp(39px,11vw,54px); }
  .spring-type-switch { gap: 7px; }
  .spring-type-switch button { min-width: 0; flex: 1; justify-content: center; gap: 6px; padding: 9px 6px; font-size: 11px; }
  .spring-type-symbol { font-size: 17px; }
  .spring-mode-switch { gap: 6px; }
  .spring-mode-switch button { font-size: 11px; }
  .spring-form-grid { gap: 16px 11px; }
  .spring-field > label { font-size: 12px; }
  .spring-field > input, .spring-field select, .spring-input-combo > input, .spring-input-combo > select, .spring-input-unit > input { min-height: 44px; padding-inline: 9px; font-size: 16px; }
  .spring-input-combo { grid-template-columns: minmax(56px,.72fr) minmax(84px,1.28fr); }
  .spring-input-combo > select { padding-inline: 5px; font-size: 11px; }
  .spring-field small { font-size: 11px; }
  .spring-kpi-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .spring-kpi-grid article:last-child { grid-column: 1 / -1; }
  .spring-kpi-grid article { padding: 11px 9px; }
  .spring-kpi-grid article > span, .spring-kpi-grid article > small { font-size: 11px; }
  .spring-kpi-grid article > strong { font-size: clamp(16px,5vw,22px); white-space: nowrap; }
  .spring-geometry-strip { gap: 7px 14px; }
  .spring-chart-card { padding-inline: 9px; }
  .spring-scope-grid { grid-template-columns: 1fr; gap: 22px; }
  .spring-scope-grid h3 { margin-top: 13px; }
  .spring-method { grid-template-columns: minmax(0,1fr); gap: 24px; }
  .spring-source-links { grid-template-columns: 1fr; }
}
@media (max-width: 365px) {
  .spring-type-switch button { flex-direction: column; gap: 4px; }
  .spring-form-grid { grid-template-columns: minmax(0,1fr); }
  .spring-mode-switch button { font-size: 11px; }
}
@media print {
  body:has([data-spring-tool]) .site-header, body:has([data-spring-tool]) .site-footer, body:has([data-spring-tool]) .section-transition-guide { display: none !important; }
  body:has([data-spring-tool]) { color: #001449; font-size: 11pt; }
  [data-spring-tool] { width: 100%; padding: 0; }
  [data-spring-tool] > * { display: none !important; }
  [data-spring-tool] > .spring-print-sheet { display: block !important; }
  .spring-print-sheet { color: #001449; font: 10pt/1.5 Arial, sans-serif; }
  .spring-print-sheet h2#spring-print-heading { margin: 0 0 16px; font-size: 27pt; }
  .spring-print-sheet h2 { margin: 0 0 13px; font-size: 18pt; }
  .spring-print-sheet h3 { margin: 16px 0 6px; font-size: 12pt; }
  .spring-print-sheet ul { margin: 0; padding-left: 20px; }
  .spring-print-sheet li { margin-bottom: 4px; overflow-wrap: anywhere; }
  .spring-print-sheet [hidden] { display: none !important; }
  .spring-print-disclaimer { margin-top: 20px; border-top: 1px solid #9aa7b8; padding-top: 10px; font-weight: 600; }
}