:root {
  --paper: #fbfbf8; --panel: #fff; --ink: #0b2239; --muted: #49617a;
  --line: #c9d5df; --line-dark: #8fa5b8; --blue: #2f83df;
  --blue-dark: #174f78; --blue-pale: #dcecf7; --green-pale: #eff8eb;
  --font-serif: Georgia, "Times New Roman", serif;
  --font-mono: "Courier New", Courier, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body { margin: 0; color: var(--ink); background: var(--paper); font: 1rem/1.38 var(--font-mono); }
button, input { font: inherit; } button { color: inherit; } [hidden] { display: none !important; } a { color: inherit; }
.site-header, main, footer { width: min(1440px, calc(100% - 56px)); margin-inline: auto; }
.site-header { min-height: 86px; display: flex; align-items: center; justify-content: space-between; gap: 28px; border-bottom: 1px solid var(--ink); }
.brand-block { padding: 9px 0 10px; }
.wordmark { display: block; color: var(--ink); font: 700 clamp(2rem, 3vw, 2.8rem)/1 var(--font-serif); letter-spacing: .01em; text-decoration: none; }
.brand-block p { margin: 8px 0 0; font-size: .92rem; letter-spacing: .015em; }
.intro { display: flex; justify-content: space-between; gap: 30px; padding: 13px 12px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: .86rem; }
.intro h1 { flex: 0 0 auto; margin: 0; color: var(--ink); font: 700 1.05rem/1.25 var(--font-serif); }
.intro p, .intro span { margin: 0; } .intro p { flex: 1; } .intro span { white-space: nowrap; font-style: italic; }
.explainer { margin: 14px 0 28px; padding: 18px; border: 1px solid var(--line-dark); background: var(--panel); }
.explainer h2 { margin-bottom: 14px; }
.explainer-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.explainer h3 { margin: 0 0 7px; font: 700 1.05rem/1.2 var(--font-serif); }
.explainer p { margin: 0; color: var(--muted); font-size: .82rem; line-height: 1.5; }
.explainer a { color: var(--blue-dark); text-underline-offset: 2px; }
.app-status, .form-message { margin: 0; min-height: 1.3em; color: #a02a2a; font-weight: 700; }
.app-status { margin-top: 14px; padding: 11px 13px; border: 1px solid var(--line-dark); background: var(--panel); }
.calculator { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(440px, .88fr); margin-top: 14px; border: 1px solid var(--line-dark); background: var(--panel); }
.map-panel, .questionnaire { min-width: 0; padding: 12px; } .map-panel { border-right: 1px solid var(--line); }
.section-heading { display: block; min-height: 0; margin: 0 0 8px; }
.section-heading > div { display: flex; align-items: baseline; gap: 8px; }
.step-number { flex: 0 0 auto; font: 700 1.45rem var(--font-serif); }
h2 { margin: 0; font: 700 clamp(1.22rem, 1.8vw, 1.55rem)/1.05 var(--font-serif); }
.section-heading p { margin: 5px 0 0; color: var(--ink); font-size: .82rem; }
.map { height: 470px; border: 1px solid var(--line-dark); background: #cbe3ec; z-index: 0; }
.leaflet-container { font-family: var(--font-mono); } .leaflet-control-zoom a { border-radius: 0 !important; color: var(--ink); }
.quiet-basemap { filter: grayscale(.78) saturate(.38) contrast(.9) brightness(1.08); opacity: .82; }
.leaflet-control-attribution { font-size: 10px; } .coverage-cell:focus { outline: 4px solid #fff; outline-offset: 2px; }
.cell-selected { filter: saturate(1.1); }
.map-footer { display: flex; justify-content: space-between; align-items: center; min-height: 38px; padding: 5px 2px; border-bottom: 1px solid var(--line); }
.map-footer p { margin: 0; font-size: .82rem; }
.text-button, .copy-button { min-height: 34px; padding: 5px 0; border: 0; border-bottom: 1px solid currentColor; background: transparent; font-size: .8rem; cursor: pointer; }
.map-key { margin: 8px 0 0; color: var(--ink); font-size: .75rem; }
.key-swatch { display: inline-block; width: 13px; height: 13px; margin: 0 5px 0 14px; border: 1px solid #81a2b7; vertical-align: -2px; }
.key-swatch:first-child { margin-left: 0; } .key-swatch.available { background: rgba(47,131,223,.4); }
.key-swatch.unavailable { background: #e3eaf0; border-style: dashed; }
fieldset { min-width: 0; margin: 0; padding: 10px 0 12px; border: 0; }
legend { float: left; width: 100%; margin: 0 0 7px; padding: 0; font: 700 1rem var(--font-serif); }
legend + * { clear: both; }
.choice-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
.choice { position: relative; display: flex; min-height: 60px; cursor: pointer; }
.choice input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.choice span { display: flex; flex: 1; flex-direction: column; justify-content: center; gap: 5px; padding: 8px 9px; border: 1px solid var(--line-dark); background: var(--panel); }
.choice strong { font-size: .8rem; line-height: 1.17; } .choice small { color: var(--muted); font-size: .72rem; line-height: 1.2; }
.choice input:checked + span { border-color: var(--blue); color: var(--ink); background: var(--blue-pale); box-shadow: inset 4px 0 0 var(--blue); }
.choice input:checked + span small { color: var(--muted); } .choice input:focus-visible + span { outline: 3px solid var(--blue); outline-offset: 2px; }
.choice:hover span { border-color: var(--blue-dark); } .choice-list--compact .choice { min-height: 53px; }
.paired-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.choice-list--stacked { grid-template-columns: 1fr; } .choice-list--stacked .choice { min-height: 34px; }
.paired-fields .choice span { gap: 3px; padding-block: 6px; }
.month-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 4px; margin: 0 0 12px; }
.month-grid label { position: relative; cursor: pointer; } .month-grid input { position: absolute; opacity: 0; }
.month-grid span { display: block; padding: 8px 2px; border: 1px solid var(--line-dark); text-align: center; font-size: .75rem; }
.month-grid input:checked + span { color: #fff; background: var(--blue-dark); border-color: var(--blue-dark); }
.month-grid input:focus-visible + span { outline: 3px solid var(--blue-dark); outline-offset: 1px; }
.form-message { font-size: .8rem; }
.loading-message { margin: 4px 0 8px; color: var(--blue-dark); font-size: .82rem; font-weight: 700; }
.loading-message::before { content: ""; display: inline-block; width: 7px; height: 7px; margin-right: 7px; background: var(--blue); animation: blink 800ms steps(2,end) infinite; }
@keyframes blink { 50% { opacity: .2; } }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; animation: none !important; transition: none !important; } }
.calculate-button { width: 100%; min-height: 48px; display: flex; justify-content: center; align-items: center; gap: 12px; margin-top: 5px; padding: 0 16px; border: 1px solid var(--blue-dark); border-radius: 3px; color: #fff; background: var(--blue-dark); font: 1.05rem var(--font-serif); cursor: pointer; }
.calculate-button:hover:not(:disabled) { background: #0d3f63; } .calculate-button:focus-visible { outline: 4px solid var(--blue); outline-offset: 2px; }
.calculate-button:disabled { color: #506779; background: #d8e3ea; border-color: #71899c; cursor: not-allowed; }
.result { scroll-margin-top: 14px; margin-top: 14px; padding: 12px; color: var(--ink); background: var(--panel); border: 1px solid var(--line-dark); }
.result-heading { display: flex; gap: 8px; align-items: baseline; margin-bottom: 9px; padding-bottom: 7px; border-bottom: 1px solid var(--line); }
.result-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr); gap: 14px; align-items: stretch; }
.headline-result { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 10px 20px 12px; border: 1px solid #cfe1ca; border-radius: 3px; background: var(--green-pale); font-family: var(--font-serif); text-align: center; }
.headline-result > span:first-child { font-size: 1rem; font-weight: 700; }
.headline-result > strong { margin: 3px 0 -3px; font-size: clamp(3.3rem, 6vw, 5.3rem); line-height: 1; letter-spacing: -.06em; }
.headline-result > span:nth-child(3) { font-size: 1.6rem; font-weight: 700; }
.practical-result { display: flex; flex-direction: column; gap: 5px; align-items: center; margin-top: 18px; padding-top: 15px; border-top: 1px solid #cfe1ca; }
.practical-result strong { font-size: 1.13rem; line-height: 1.25; letter-spacing: 0; }
.practical-result span { font-family: var(--font-mono); font-size: .8rem; }
.result-metrics { width: 100%; display: grid; grid-template-columns: repeat(3,1fr); margin-top: 17px; }
.result-metrics div { padding: 0 9px; border-left: 1px solid #cfe1ca; } .result-metrics div:first-child { border-left: 0; }
.result-metrics small { display: block; min-height: 2.5em; font: .75rem/1.25 var(--font-mono); } .result-metrics b { display: block; margin-top: 3px; font-size: 1.16rem; }
.result-detail { display: flex; flex-direction: column; justify-content: center; padding: 18px; border: 1px solid var(--line); }
.result-detail h3 { margin: 0 0 7px; font: 700 1.12rem var(--font-serif); }
.result-detail p { margin: 5px 0; font-size: .86rem; }
.result-facts { display: grid; gap: 7px; margin: 13px 0 5px; }
.result-facts div { display: grid; grid-template-columns: 70px 1fr; gap: 10px; padding-top: 7px; border-top: 1px solid var(--line); }
.result-facts dt { color: var(--muted); font-size: .75rem; font-weight: 700; text-transform: uppercase; }
.result-facts dd { margin: 0; font-size: .8rem; }
.capture-choice { margin-top: 8px; padding-bottom: 5px; }
.capture-choice legend { font-size: .98rem; line-height: 1.25; }
.choice-list--capture .choice { min-height: 55px; }
.choice-list--capture .choice span { padding: 8px; }
.practical-caveat { color: var(--muted); }
.copy-button { align-self: flex-start; margin-top: 10px; color: var(--blue-dark); }
.ownership-maths { margin-top: 12px; border: 1px solid var(--line); }
.ownership-maths summary { padding: 12px; font: 700 1.05rem var(--font-serif); cursor: pointer; }
.ownership-body { display: grid; gap: 14px; padding: 0 12px 14px; }
.cost-entry { display: grid; grid-template-columns: minmax(220px, 1fr) auto; gap: 7px 16px; align-items: center; padding-top: 12px; border-top: 1px solid var(--line); }
.cost-entry label { font: 700 .92rem var(--font-serif); }
.cost-entry small { grid-column: 1 / -1; color: var(--muted); font-size: .75rem; }
.currency-input { display: flex; align-items: center; border: 1px solid var(--line-dark); background: var(--panel); }
.currency-input > span { padding-left: 10px; font-weight: 700; }
.currency-input input { width: 135px; min-height: 42px; padding: 7px 9px 7px 4px; border: 0; color: var(--ink); background: transparent; }
.currency-input:focus-within { outline: 3px solid var(--blue); outline-offset: 2px; }
.ownership-summary { margin: 0; font: 700 .96rem/1.4 var(--font-serif); }
.cost-table-wrap { overflow-x: auto; }
.cost-table { width: 100%; border-collapse: collapse; font-size: .8rem; text-align: right; }
.cost-table th, .cost-table td { padding: 9px 10px; border: 1px solid var(--line); }
.cost-table thead th { background: #f2f6f8; font-family: var(--font-serif); }
.cost-table th:first-child { text-align: left; }
.cost-note { margin: 0; color: var(--muted); font-size: .75rem; }
.history-wrap { margin-top: 12px; padding: 12px; border: 1px solid var(--line); }
.history-heading { display: flex; justify-content: space-between; align-items: baseline; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.history-heading h3 { margin: 0; font: 700 1.08rem var(--font-serif); } .history-heading p { margin: 0; color: var(--muted); font-size: .75rem; }
.history-chart { height: 170px; display: flex; align-items: stretch; gap: 4px; margin-top: 12px; padding-top: 18px; border-bottom: 1px solid var(--line-dark); background: repeating-linear-gradient(to bottom,transparent 0,transparent 36px,rgba(143,165,184,.25) 37px); }
.history-column { position: relative; flex: 1; min-width: 0; display: grid; grid-template-rows: 1fr 25px; align-items: end; }
.history-bar { display: block; height: var(--bar-height); background: #4a92df; } .history-column:hover .history-bar { background: var(--blue-dark); }
.history-value { position: absolute; top: -18px; left: 50%; transform: translateX(-50%); opacity: 0; font-size: .72rem; }
.history-column:hover .history-value { opacity: 1; } .history-year { align-self: center; color: var(--muted); font-size: .68rem; text-align: center; }
.assumptions { margin-top: 12px; border: 1px solid var(--line); }
.assumptions summary { padding: 10px 12px; font-family: var(--font-serif); font-weight: 700; cursor: pointer; }
.assumptions dl { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; margin: 0; padding: 0 12px 12px; }
.assumptions dl div { display: grid; grid-template-columns: 105px 1fr; gap: 8px; padding: 7px 0; border-top: 1px solid var(--line); }
.assumptions dt { color: var(--muted); font-size: .75rem; font-weight: 700; text-transform: uppercase; } .assumptions dd { margin: 0; font-size: .8rem; }
.fine-print { display: flex; justify-content: space-between; gap: 40px; margin-top: 14px; padding: 12px; border: 1px solid var(--line); color: var(--muted); font-size: .75rem; }
.fine-print p { margin: 0; max-width: 650px; }
footer { display: flex; justify-content: space-between; margin-top: 14px; padding: 12px 0 28px; border-top: 1px solid var(--ink); font-size: .75rem; }
@media (max-width: 1040px) { .calculator { grid-template-columns: 1fr; } .map-panel { border-right: 0; } .questionnaire { border-top: 1px solid var(--line-dark); } .map { height: 500px; } }
@media (max-width: 720px) {
  .site-header, main, footer { width: min(100% - 28px,680px); }
  .site-header { display: block; padding: 18px 8px 12px; } .wordmark { font-size: clamp(2.15rem,10.5vw,3.1rem); max-width: 360px; }
  .brand-block p { font-size: .84rem; }
  .intro { display: block; padding: 11px 6px; } .intro h1 { margin-bottom: 5px; } .intro span { display: block; margin-top: 6px; }
  .explainer { padding: 14px; } .explainer-grid { grid-template-columns: 1fr; gap: 17px; }
  .calculator { margin-top: 12px; } .map-panel, .questionnaire { padding: 10px; } .section-heading p { margin-top: 6px; font-size: .8rem; }
  .map { height: min(68vh,500px); min-height: 380px; } .map-footer { align-items: flex-start; gap: 12px; } .map-key { line-height: 1.8; }
  .choice-list { grid-template-columns: 1fr; } .choice { min-height: 48px; } .choice span { flex-direction: row; justify-content: space-between; align-items: center; }
  .choice-list--stacked .choice span { display: block; } .paired-fields { gap: 10px; } .month-grid { grid-template-columns: repeat(4,1fr); }
  .calculate-button { min-height: 52px; } .result { padding: 10px; } .result-grid { grid-template-columns: 1fr; }
  .headline-result { min-height: 280px; } .headline-result > strong { font-size: clamp(4.5rem,22vw,7rem); } .headline-result > span:nth-child(3) { font-size: 1.5rem; }
  .choice-list--capture { grid-template-columns: 1fr; } .choice-list--capture .choice { min-height: 48px; }
  .cost-entry { grid-template-columns: 1fr; } .currency-input { width: max-content; } .cost-entry small { grid-column: auto; }
  .history-heading { display: block; } .history-heading p { margin-top: 3px; } .history-chart { height: 190px; gap: 2px; overflow: hidden; } .history-year { font-size: .62rem; }
  .assumptions dl { grid-template-columns: 1fr; } .fine-print, footer { display: block; }
  .fine-print p + p, footer span + span { display: block; margin-top: 9px; }
}
@media (max-width: 400px) { .paired-fields { grid-template-columns: 1fr; } .paired-fields fieldset:last-child { padding-top: 0; border-top: 0; } .result-metrics small { min-height: 34px; } }

/* Keyboard navigation and nonvisual alternatives. */
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: absolute; top: 8px; left: 14px; z-index: 1000; padding: 12px; color: var(--ink); background: var(--panel); border: 2px solid var(--blue-dark); transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--blue-dark); outline-offset: 3px; }
.map-instructions { margin: 8px 0; color: var(--muted); font-size: .75rem; }
.history-values { margin-top: 12px; }
.history-values summary { padding: 8px 0; cursor: pointer; }

.area-opportunities { margin-top: 12px; padding: 18px; border: 1px solid var(--line-dark); }
.area-opportunities h3 { margin: 0; font: 700 1.2rem var(--font-serif); }
.area-intro { margin: 7px 0 18px; color: var(--muted); font-size: .85rem; }
.area-layout { display: grid; grid-template-columns: minmax(0,1.6fr) minmax(0,1fr); gap: 26px; align-items: center; }
.area-diagram { min-width: 0; }
.result-map { height: 330px; border: 1px solid var(--line-dark); background: var(--blue-pale); cursor: default; }
.result-map .leaflet-interactive { cursor: pointer; }
.result-cell:focus-visible { outline: none; stroke: var(--ink); stroke-width: 3px; }
.result-cell-number { pointer-events: none; text-align: center; }
.result-cell-number span { display: block; padding: 3px 0; color: var(--ink); background: rgba(255,255,255,.94); border: 1px solid var(--line-dark); font: 700 1rem/20px var(--font-mono); }
.result-cell-tooltip { width: 190px; white-space: normal; border-radius: 0; color: var(--ink); font: .78rem/1.5 var(--font-mono); }
.area-legend { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 6px 12px; align-items: center; margin-top: 10px; color: var(--muted); font-size: .7rem; }
.area-scale { display: flex; gap: 10px; }
.area-scale span { display: flex; gap: 4px; align-items: center; }
.area-scale i { width: 12px; height: 12px; border: 1px solid var(--line-dark); }
.area-map-note { margin: 7px 0 0; font-size: .7rem; color: var(--muted); }
.area-summary { display: grid; gap: 20px; margin: 0; }
.area-summary > div { padding: 10px 0 10px 12px; border-left: 3px solid transparent; }
.area-summary > div.is-active { border-left-color: var(--blue-dark); background: var(--blue-pale); }
.area-summary dt { font-size: .75rem; font-weight: 700; text-transform: uppercase; }
.area-summary dd { margin: 7px 0 0; }
.area-summary strong { display: block; margin-top: 5px; font: 700 1.65rem var(--font-serif); }
.area-summary small { font-size: .85rem; font-weight: 400; }
.area-summary span { display: block; font-size: .75rem; overflow-wrap: anywhere; }
.area-flexibility { margin: 18px 0 0; padding-top: 12px; border-top: 1px solid var(--line); font: .95rem/1.45 var(--font-serif); }
@media (max-width: 700px) { .area-opportunities { padding: 14px; } .area-layout { grid-template-columns: 1fr; gap: 16px; } .result-map { height: 300px; } .area-summary { grid-template-columns: 1fr 1fr; gap: 12px; } .result-cell-tooltip { width: 160px; } }