:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --paper: #ffffff;
  --ink: #1d2939;
  --muted: #667085;
  --border: #e2e7ee;
  --accent: #526780;
  --accent-soft: #edf1f6;
  accent-color: var(--accent);
  font: 14px/1.5 Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
}
* { box-sizing: border-box; }
body { margin: 0; }
button, input, select { font: inherit; color: inherit; }
button, a, input, select { -webkit-tap-highlight-color: transparent; }
input, select {
  min-width: 0;
  max-width: 100%;
  border: 1px solid #d7dbe1;
  border-radius: 6px;
  background: var(--paper);
  padding: 9px 11px;
}
input::placeholder { color: #747d8b; }
select, button, summary { cursor: pointer; }
button {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  background: var(--paper);
}
button:hover { background: var(--accent-soft); }
button:disabled { cursor: default; opacity: .55; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
input[aria-invalid="true"] { border-color: #a74444; }
[hidden] { display: none !important; }
a { color: #405b7b; text-underline-offset: 3px; }
a:hover { color: #263f60; }
h1, h2, h3, p { margin: 0; }
h1 { font-size: clamp(25px, 3vw, 32px); line-height: 1.25; font-weight: 550; letter-spacing: -.035em; }
h2 { font-size: 20px; line-height: 1.35; font-weight: 550; letter-spacing: -.025em; }
h3 { font-size: 15px; font-weight: 600; }
.shell { max-width: 1200px; margin: auto; padding-inline: clamp(16px, 3.5vw, 40px); }
.masthead { border-bottom: 1px solid var(--border); background: var(--paper); }
.mast-inner, nav, .brand { display: flex; align-items: center; }
.mast-inner { justify-content: space-between; min-height: 68px; gap: 20px; }
.brand { gap: 10px; font-size: 17px; font-weight: 550; letter-spacing: -.35px; white-space: nowrap; }
.brand img { width: 30px; height: 30px; }
.brand, nav a { color: var(--ink); text-decoration: none; }
nav { gap: 4px; }
nav a { padding: 8px 11px; border-radius: 6px; font-size: 12px; font-weight: 500; color: var(--muted); }
nav a:hover, nav a[aria-current] { color: var(--ink); background: var(--accent-soft); }
.skip { position: absolute; transform: translateY(-160%); padding: 10px; background: var(--paper); z-index: 5; }
.skip:focus { transform: translateY(0); }
main.shell { padding-top: 30px; padding-bottom: 56px; }
.page-heading { margin-bottom: 18px; }
.page-heading p { color: var(--muted); margin-top: 7px; font-size: 14px; }
.examples { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; padding-bottom: 18px; }
label, .field-label { font-size: 12px; font-weight: 500; color: var(--muted); }
.examples select { padding: 7px 30px 7px 10px; font-size: 13px; }
.choices { display: flex; flex-wrap: nowrap; gap: 12px; align-items: flex-start; min-width: 0; max-width: 100%; padding: 6px 8px 14px; overflow-x: auto; overflow-y: hidden; overscroll-behavior-x: contain; scrollbar-width: thin; scrollbar-color: #aeb9c8 #edf1f6; -webkit-overflow-scrolling: touch; }
.choice, .results, .record, .library-group { border: 1px solid var(--border); border-radius: 9px; background: var(--paper); }
.choice { min-width: 0; flex: 0 0 320px; }
.add-choice { display: grid; place-items: center; flex: 0 0 44px; width: 44px; height: 44px; padding: 0; margin-top: 40px; border-color: #c6cfda; font-size: 26px; font-weight: 400; line-height: 1; }
.picker > .remove-choice { position: absolute; top: 7px; right: 9px; width: 32px; height: 32px; padding: 0; border: 0; background: transparent; color: var(--muted); font-size: 21px; line-height: 1; }
.picker > .remove-choice:hover { color: var(--ink); background: var(--accent-soft); }
.choice-context, .result-note, .record p, .results-heading p, .lib-intro { color: var(--muted); font-size: 13px; }
.picker { position: relative; padding: 16px 16px 14px; }
.picker > label { display: block; margin: 0 28px 8px 0; }
.picker-search { position: relative; min-width: 0; }
.picker-search:focus-within { z-index: 3; }
.picker input[type="search"] {
  width: 100%;
  height: 44px;
  padding: 0 13px 0 42px;
  border-radius: 9px;
  background-color: #f3f7fd;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 20 20' fill='none' stroke='%23667085' stroke-width='1.6' stroke-linecap='round'%3E%3Ccircle cx='8.5' cy='8.5' r='5.5'/%3E%3Cpath d='m13 13 4 4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: 13px center;
  font-size: 14px;
  color: var(--ink);
  transition: background-color .15s, border-color .15s;
}
.picker input[type="search"]:focus { border-color: #8da0b8; background-color: var(--paper); outline: 2px solid #8da0b8; outline-offset: 2px; }
.picker > .choice-context { margin-top: 12px; }
.evidence-badge { display: inline-flex; align-items: center; gap: 5px; padding: 2px 7px; border-radius: 4px; background: var(--accent-soft); color: #46586e; font-size: 11px; font-weight: 500; line-height: 1.6; }
.evidence-badge svg { width: 13px; height: 13px; fill: none; stroke: currentColor; stroke-width: 1.3; stroke-linecap: round; stroke-linejoin: round; }
.picker > .evidence-badge, .picker-option .evidence-badge, .factor > .evidence-badge { margin-top: 6px; }
.measure-evidence { margin-block: 10px; }
.measure-evidence p { margin-top: 5px; }
.picker-panel {
  position: fixed;
  inset: auto;
  margin: 0;
  box-sizing: border-box;
  max-width: calc(100vw - 16px);
  z-index: 10;
  display: flex;
  flex-direction: column;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--paper);
  color: var(--ink);
  box-shadow: 0 12px 36px #32363c20;
  overflow-x: hidden;
  overflow-y: auto;
}
.picker-panel[hidden], .picker-panel[popover]:not(:popover-open) { display: none; }
.picker-toolbar { display: flex; gap: 6px; align-items: center; flex: 0 0 auto; padding: 0 0 4px; border-bottom: 1px solid var(--border); }
.picker-toolbar .picker-breadcrumb { display: flex; flex: 1; min-width: 0; width: auto; align-items: center; flex-wrap: nowrap; gap: 0; overflow-x: auto; white-space: nowrap; scrollbar-width: none; }
.picker-breadcrumb::-webkit-scrollbar { display: none; }
.picker-breadcrumb > * { flex: 0 0 auto; min-width: 0; max-width: 100%; padding: 8px; font-size: 12px; line-height: 1.4; overflow: hidden; text-overflow: ellipsis; }
.picker-breadcrumb > * + *::before { content: '›'; margin-right: 8px; color: var(--muted); }
.picker-breadcrumb button { border: 0; background: transparent; color: #405b7b; text-align: left; }
.picker-breadcrumb [aria-current] { color: var(--muted); }
.picker-back, .picker-close { flex: 0 0 auto; min-height: 38px; padding: 6px 8px; font-size: 12px; background: transparent; }
.picker-status { flex: 0 0 auto; margin: 0; padding: 7px 10px 4px; color: var(--muted); font-size: 11px; }
.picker-list { min-height: 64px; max-height: 330px; padding: 2px 18px 4px 2px; overflow-x: hidden; overflow-y: auto; overscroll-behavior: contain; touch-action: pan-y; -webkit-overflow-scrolling: touch; scrollbar-gutter: stable; scrollbar-width: thin; scrollbar-color: #aeb9c8 #edf1f6; }
.picker-option { position: relative; display: block; width: 100%; min-height: 50px; padding: 10px 28px 10px 10px; text-align: left; border: 1px solid transparent; border-radius: 5px; background: transparent; font-size: 14px; line-height: 1.35; overflow-wrap: anywhere; }
.picker-option strong { display: block; font-size: 14px; font-weight: 500; }
.picker-option small { display: block; margin-top: 4px; color: var(--muted); font-size: 11px; line-height: 1.5; font-weight: 400; }
.picker-option:hover { background: #f5f7fa; }
.picker-option[aria-selected="true"] { background: var(--accent-soft); border-color: #b4bfcd; }
.picker-option:focus-visible { outline-offset: -2px; }
.picker-chevron { position: absolute; top: 16px; right: 10px; color: var(--muted); font-size: 20px; }
.picker-more { flex: 0 0 auto; min-height: 44px; margin-top: 5px; font-size: 13px; }
.choice .advanced { border-top: 1px solid var(--border); padding: 7px 16px; }
summary { width: fit-content; font-size: 13px; font-weight: 500; padding: 4px 0; }
.advanced summary { color: #405b7b; }
.fields, .library-filters { display: grid; gap: 12px; }
.fields { padding: 10px 0; }
.choice .fields .picker { padding: 0; }
.fields .picker > label { margin: 0 0 5px; }
.fields label, .library-filters label { display: grid; gap: 5px; }
.fields select, .fields input, .library-filters select, .library-filters input { width: 100%; font-size: 14px; font-weight: 400; color: var(--ink); }
.pair { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; }
.input-hint { color: var(--muted); font-size: 12px; font-weight: 400; }
.results { min-width: 0; padding: 21px 22px 16px; margin-top: 22px; }
.results-heading { display: flex; justify-content: space-between; align-items: start; gap: 14px; margin-bottom: 15px; }
.results-heading p { margin-top: 4px; }
.comparison-horizon { display: grid; grid-template-columns: minmax(80px, 110px) minmax(100px, 140px); gap: 8px 12px; align-items: end; margin-bottom: 16px; }
.comparison-horizon label { display: grid; gap: 5px; }
.comparison-horizon input, .comparison-horizon select { width: 100%; min-height: 44px; }
.comparison-horizon p { grid-column: 1 / -1; color: var(--muted); font-size: 12px; }
.comparison-horizon #horizon-error { color: #a74444; }
.measure-text { font-size: 13px; font-weight: 600; color: var(--ink); }
.water-scope { display: block; margin-top: 4px; color: var(--muted); font-size: 11px; line-height: 1.5; font-weight: 400; }
.hide-measures { display: flex; align-items: center; gap: 7px; font-size: 12px; color: var(--muted); font-weight: 400; }
.hide-measures input { width: 15px; height: 15px; margin: 0; }
.comparison-table { width: 100%; min-width: calc(160px + var(--choice-count, 2) * 180px); border-collapse: collapse; table-layout: fixed; text-align: left; }
.comparison-table th, .comparison-table td { padding: 16px 14px; vertical-align: top; border-top: 1px solid var(--border); overflow-wrap: anywhere; }
.comparison-table thead th { padding-top: 12px; padding-bottom: 12px; font-size: 12px; font-weight: 500; background: #f8fafc; }
.comparison-table th:first-child { width: 160px; padding-left: 0; position: sticky; left: 0; z-index: 1; background: var(--paper); padding-right: 14px; box-shadow: 1px 0 0 var(--border); }
.comparison-table th:last-child { padding-right: 0; }
.comparison-table thead th:first-child { background: var(--paper); z-index: 2; }
.comparison-table tbody th { font-weight: 500; }
.result-scroll { min-width: 0; max-width: 100%; scrollbar-width: thin; scrollbar-color: #aeb9c8 #edf1f6; overflow-x: auto; overscroll-behavior-x: contain; -webkit-overflow-scrolling: touch; }
.column-quantity { display: block; margin-top: 6px; color: var(--muted); font-size: 11px; line-height: 1.5; font-weight: 400; }
.column-letter { display: block; margin-bottom: 4px; color: var(--muted); font-size: 11px; font-weight: 600; }
.measure-controls { display: grid; grid-template-columns: minmax(0, 1fr); justify-items: start; gap: 0; }
.measure-label { color: var(--ink); }
.measure-details { display: inline-flex; align-items: center; justify-content: flex-start; gap: 5px; min-width: 64px; min-height: 44px; padding: 0; border: 0; border-radius: 3px; background: transparent; color: #405b7b; font-size: 12px; font-weight: 400; white-space: nowrap; }
.measure-details svg { flex: 0 0 15px; width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.6; }
.measure-details-text { text-decoration: underline; text-underline-offset: 3px; }
.measure-details:hover { background: transparent; color: #263f60; }
.measure-details:focus-visible { outline-offset: -2px; }
.metric-bar { height: 4px; width: 100%; margin-top: 10px; background: #edf0f5; border-radius: 2px; overflow: hidden; }
.metric-fill { display: block; height: 100%; max-width: 100%; background: var(--accent); border-radius: inherit; }
.metric-fill.has-value { min-width: 1px; }
.measure-dialog { width: min(720px, calc(100% - 32px)); max-height: calc(100dvh - 48px); margin: auto; padding: 0; border: 1px solid #d7dfe8; border-radius: 10px; color: var(--ink); background: var(--paper); box-shadow: 0 20px 70px #1d29392b; overflow: auto; }
.measure-dialog::backdrop { background: #1d293970; }
.dialog-header { position: sticky; top: 0; z-index: 1; display: flex; justify-content: space-between; gap: 16px; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border); background: var(--paper); }
.dialog-header h2 { font-size: 20px; }
.dialog-close { min-width: 38px; min-height: 38px; flex: 0 0 auto; padding: 6px 10px; color: var(--muted); }
.measure-dialog-intro { margin: 17px 20px; color: var(--muted); font-size: 13px; }
.measure-dialog-entry { margin: 0 20px; padding: 18px 0; border-top: 1px solid var(--border); overflow-wrap: anywhere; }
.measure-dialog-entry:last-child { padding-bottom: 22px; }
.measure-dialog-entry h3 { font-size: 14px; font-weight: 550; }
.measure-dialog-entry p { margin-top: 7px; font-size: 13px; }
.measure-dialog-result { font-weight: 600; font-variant-numeric: tabular-nums; }
.measure-dialog-formula { padding: 10px 12px; border-radius: 6px; background: #f5f7fa; font-variant-numeric: tabular-nums; }
.measure-dialog-scope { color: var(--muted); }
.source-values { margin-block: 8px; padding-inline-start: 26px; font-size: 13px; }
.measure-dialog-entry .source-links { margin-top: 12px; }
.metric-value { display: block; font-size: clamp(17px, 2vw, 23px); line-height: 1.3; letter-spacing: -.025em; font-weight: 550; font-variant-numeric: tabular-nums; }
.metric-detail { display: block; color: var(--muted); margin-top: 5px; font-size: 12px; line-height: 1.5; font-weight: 400; }
.source-links { display: flex; flex-wrap: wrap; gap: 5px 15px; font-size: 12px; }
.result-note { border-top: 1px solid var(--border); padding-top: 12px; font-size: 12px; }
.library-filters { grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); margin: 18px 0 22px; }
.library-filters input[type="search"] { background: #f3f7fd; border-radius: 9px; }
.library-group, .record { padding: 15px 20px; margin: 13px 0; }
.library-group > summary { width: 100%; font-size: 16px; font-weight: 550; }
.library-group .lib-intro { margin: 7px 0; }
.factor { padding: 14px 0; border-top: 1px solid var(--border); }
.factor:first-of-type { margin-top: 14px; }
.factor h3 { font-size: 14px; }
.factor p, .factor-actions button { font-size: 12px; }
.factor p { margin: 4px 0; color: var(--muted); }
.factor-actions { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 10px; }
.factor-actions button { padding: 6px 10px; }
.record { padding: 20px; }
.record h2 { font-size: 19px; }
.record p, .record .source-links { margin-top: 9px; }
.record .scope { margin: 0 0 7px; color: #526780; font-size: 12px; font-weight: 500; }
@media (min-width: 900px) {
  #compare { display: grid; grid-template-columns: minmax(0, 1fr) auto; column-gap: 24px; }
  #compare > :not(.page-heading):not(.examples) { grid-column: 1 / -1; }
  #compare .examples { align-self: end; padding-bottom: 18px; }
}
@media (max-width: 700px) {
  .mast-inner { align-items: start; flex-direction: column; gap: 7px; padding-block: 13px 9px; }
  nav { width: 100%; flex-wrap: wrap; gap: 2px; }
  nav a { padding: 7px 9px; }
  main.shell { padding-top: 22px; }
  .choice { flex-basis: min(300px, calc(100vw - 64px)); }
  .picker { padding-inline: 16px; }
  .choice .advanced { padding-inline: 16px; }
  .picker-list { max-height: 48dvh; }
  .picker-breadcrumb button, .picker-back, .picker-close { min-height: 44px; }
  .results { min-width: 0; padding: 17px 16px 13px; margin-top: 18px; }
  .results-heading { flex-wrap: wrap; }
  .comparison-table th, .comparison-table td { padding: 13px 9px; }
  .examples { padding-bottom: 15px; }
}
@media (max-width: 440px) {
  .library-filters { grid-template-columns: 1fr; }
  .results-heading { display: grid; }
  .comparison-table { font-size: 12px; min-width: calc(100px + var(--choice-count, 2) * 140px); }
  .comparison-table th:first-child { width: 100px; padding-right: 7px; }
  .comparison-table th, .comparison-table td { padding: 12px 7px; }
  .comparison-table .metric-value { font-size: 16px; }
  .comparison-table .metric-detail { font-size: 11px; }
  .measure-dialog { width: calc(100% - 20px); max-height: calc(100dvh - 24px); }
  .dialog-header { padding: 13px 16px; }
  .measure-dialog-intro { margin-inline: 16px; }
  .measure-dialog-entry { margin-inline: 16px; }
  .metric-detail, .water-scope { hyphens: auto; }
  .library-group, .record { padding-inline: 15px; }
  input, select, .fields select, .fields input, .picker input[type="search"] { font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}

.credits-footer { margin-top: 24px; font-size: 13px; }
.library-more { margin: 15px 0 4px; padding: 7px 12px; }
.credits-page { max-width: 900px; }
.credits-page section { margin-top: 20px; }
.credits-page h2 { margin-bottom: 8px; }
.credits-page p + p { margin-top: 8px; }