:root {
  --ink: #17211d;
  --muted: #6e7973;
  --paper: #f4f3ee;
  --card: #fffefa;
  --line: #d8dbd5;
  --green: #1e6549;
  --green-dark: #174b38;
  --mint: #dbeadf;
  --orange: #e66b3d;
  --orange-soft: #f9e5dc;
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 5%, rgba(215, 231, 218, .75), transparent 24rem),
    var(--paper);
  font-family: Manrope, system-ui, sans-serif;
}
button, input, select { font: inherit; }
button { color: inherit; }
[hidden] { display: none !important; }
.shell { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  min-height: 104px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; gap: 12px; align-items: center; color: inherit; text-decoration: none; font-size: 12px; font-weight: 700; line-height: 1.2; letter-spacing: .04em; text-transform: uppercase; }
.brand-mark { display: grid; place-items: center; width: 43px; height: 43px; border-radius: 50%; background: var(--green); color: white; font: 500 25px/1 Georgia, serif; }
.source-link { display: flex; gap: 18px; align-items: center; color: var(--green-dark); text-decoration: none; font-size: 13px; font-weight: 700; }
.source-link span:last-child { font-size: 18px; transition: transform .2s; }
.source-link:hover span:last-child { transform: translate(2px, -2px); }

.tool-tabs { display: flex; gap: 6px; padding-top: 18px; overflow-x: auto; scrollbar-width: thin; }
.tool-tabs button { display: flex; align-items: center; gap: 11px; padding: 11px 16px; border: 1px solid transparent; border-radius: 7px; color: var(--muted); background: transparent; font-size: 12px; font-weight: 700; cursor: pointer; }
.tool-tabs button span { color: #9aa39d; font: 500 9px/1 DM Mono, monospace; }
.tool-tabs button.active { border-color: var(--line); color: var(--green-dark); background: rgba(255,255,255,.55); }
.tool-tabs button:focus-visible { outline: 2px solid var(--green); outline-offset: 2px; }

.hero { padding: 76px 0 50px; }
.eyebrow { display: flex; align-items: center; gap: 10px; color: var(--green); font: 500 12px/1 DM Mono, monospace; text-transform: uppercase; letter-spacing: .12em; }
.eyebrow span { width: 22px; height: 2px; background: var(--orange); }
.hero h1 { max-width: 820px; margin: 21px 0 22px; font-size: clamp(44px, 6.6vw, 82px); line-height: .98; letter-spacing: -.055em; font-weight: 500; }
.hero h1 i { color: var(--green); font-family: Georgia, serif; font-weight: 400; }
.hero > p { max-width: 650px; margin: 0; color: var(--muted); font-size: 17px; line-height: 1.65; }

.calculator {
  display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  border: 1px solid var(--line); background: var(--card); box-shadow: 0 20px 60px rgba(38, 52, 44, .07);
}
.input-panel, .result-panel { position: relative; padding: 42px 48px 46px; }
.input-panel { border-right: 1px solid var(--line); }
.result-panel { background: #edf3ed; }
.panel-number { position: absolute; top: 24px; right: 28px; color: #aeb6b0; font: 500 11px/1 DM Mono, monospace; }
h2 { margin: 0 0 30px; font-size: 20px; letter-spacing: -.02em; }
.mode-field { margin: 0 0 30px; padding: 0; border: 0; }
.mode-field legend, .value-label { margin-bottom: 10px; color: var(--muted); font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; }
.segmented { display: grid; grid-template-columns: 1fr 1fr; padding: 4px; border: 1px solid var(--line); border-radius: 10px; background: #f4f5f1; }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented span { min-height: 60px; display: grid; place-items: center; padding: 8px; border-radius: 7px; color: var(--muted); font-size: 12px; text-align: center; cursor: pointer; }
.segmented span b { display: block; color: var(--ink); font: 500 20px/1.1 Georgia, serif; }
.segmented input:checked + span { color: var(--green-dark); background: white; box-shadow: 0 2px 8px rgba(30, 50, 40, .08); }
.segmented input:focus-visible + span { outline: 2px solid var(--green); outline-offset: 2px; }
.value-label { display: flex; justify-content: space-between; }
.value-label .range { font-family: DM Mono, monospace; font-weight: 400; letter-spacing: 0; }
.number-input { position: relative; }
.number-input input {
  width: 100%; height: 80px; padding: 0 96px 0 20px; border: 0; border-bottom: 2px solid var(--green);
  border-radius: 6px 6px 0 0; outline: 0; color: var(--ink); background: #f6f7f3;
  font: 500 36px/1 DM Mono, monospace;
}
.number-input input:focus { background: #f0f5ef; box-shadow: inset 0 0 0 1px rgba(30,101,73,.18); }
.number-input input.invalid { border-color: #b33d32; }
.number-input span { position: absolute; right: 20px; top: 50%; transform: translateY(-50%); color: var(--green); font: 500 18px/1 DM Mono, monospace; }
.input-help, .input-error { min-height: 18px; margin: 9px 0 0; color: var(--muted); font-size: 11px; }
.input-error { display: none; color: #a5352b; }
.quick-values { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 27px; }
.quick-values > span { margin-right: 4px; color: var(--muted); font-size: 11px; font-weight: 700; text-transform: uppercase; }
.quick-values button { padding: 7px 11px; border: 1px solid var(--line); border-radius: 20px; background: transparent; font: 500 11px/1 DM Mono, monospace; cursor: pointer; }
.quick-values button:hover { border-color: var(--green); color: var(--green); background: white; }

.result-heading { display: flex; justify-content: space-between; align-items: flex-start; }
.badge { padding: 7px 10px; border-radius: 20px; color: #92502d; background: var(--orange-soft); font: 500 10px/1 DM Mono, monospace; text-transform: uppercase; letter-spacing: .06em; }
.badge.exact { color: var(--green-dark); background: var(--mint); }
.result-comparison { display: grid; grid-template-columns: 1.45fr 1fr; gap: 12px; margin-top: 30px; }
.result-version { min-width: 0; padding: 16px 18px; border: 1px solid #cbd4cc; background: rgba(255,255,255,.38); }
.likely-result { border-top: 3px solid var(--green); }
.published-result { border-top: 3px solid var(--orange); }
.version-label { color: var(--muted); font: 500 9px/1.3 DM Mono, monospace; text-transform: uppercase; letter-spacing: .05em; }
.main-result, .secondary-result { display: flex; align-items: baseline; gap: 10px; margin-top: 16px; }
.main-result span { color: var(--green); font: italic 36px/1 Georgia, serif; }
.main-result strong { font: 500 clamp(35px, 4vw, 56px)/1 DM Mono, monospace; letter-spacing: -.06em; }
.secondary-result span { color: var(--orange); font: italic 25px/1 Georgia, serif; }
.secondary-result strong { font: 500 clamp(23px, 2.5vw, 34px)/1 DM Mono, monospace; letter-spacing: -.05em; }
#result-caption { margin: 10px 0 39px; color: var(--muted); font-size: 12px; }
.references { border-top: 1px solid #cbd4cc; }
.reference-head, .reference-row { display: grid; grid-template-columns: 1fr 100px 100px; gap: 16px; align-items: center; }
.reference-head { padding: 14px 0 10px; color: var(--muted); font: 500 10px/1 DM Mono, monospace; text-transform: uppercase; }
.reference-head span:not(:first-child), .reference-row strong { text-align: right; }
.reference-row { padding: 13px 0; border-top: 1px solid #d7dfd8; font-size: 12px; }
.reference-row > span { display: flex; align-items: center; gap: 9px; }
.reference-row i { width: 7px; height: 7px; border-radius: 50%; background: var(--green); }
.reference-row.published i { background: var(--orange); }
.reference-row.upper i { opacity: .5; }
.reference-row strong { font: 500 13px/1 DM Mono, monospace; }
.formula { margin-top: 25px; padding: 17px 18px; border: 1px solid #cdd7ce; background: rgba(255,255,255,.42); }
.formula-title { display: flex; justify-content: space-between; align-items: center; color: var(--green-dark); font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; }
.formula-title button { width: 22px; border: 0; background: transparent; cursor: pointer; font-size: 18px; }
.formula code { display: block; margin-top: 13px; white-space: normal; color: var(--ink); font: 500 11px/1.6 DM Mono, monospace; }
.formula p { margin: 8px 0 0; color: var(--muted); font: 400 10px/1.5 DM Mono, monospace; }
.formula.collapsed #formula-body { display: none; }

.charts-section { margin-top: 76px; }
.charts-heading { display: flex; align-items: end; justify-content: space-between; gap: 40px; margin-bottom: 26px; }
.charts-heading h2 { margin: 14px 0 8px; font-size: clamp(28px, 4vw, 44px); font-weight: 500; letter-spacing: -.04em; }
.charts-heading p { max-width: 650px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.chart-range { flex: 0 0 auto; display: flex; padding: 4px; border: 1px solid var(--line); border-radius: 9px; background: #e9eae5; }
.chart-range button { padding: 10px 13px; border: 0; border-radius: 6px; color: var(--muted); background: transparent; font-size: 10px; font-weight: 700; cursor: pointer; }
.chart-range button.active { color: var(--green-dark); background: white; box-shadow: 0 2px 7px rgba(30,50,40,.08); }
.chart-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.chart-card { border: 1px solid var(--line); background: var(--card); }
.chart-card header { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 20px 22px 16px; border-bottom: 1px solid var(--line); }
.chart-card header > div { display: flex; align-items: center; gap: 10px; }
.chart-card h3 { margin: 0; font-size: 14px; }
.chart-card header > span { color: var(--muted); font: 500 9px/1.3 DM Mono, monospace; text-align: right; text-transform: uppercase; }
.chart-index { display: grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; color: white; background: var(--orange); font: 500 10px/1 DM Mono, monospace; }
.likely-chart .chart-index { background: var(--green); }
.chart { min-height: 270px; padding: 10px 12px 0; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart-card > p { margin: 0; padding: 12px 22px 18px; color: var(--muted); font-size: 10px; line-height: 1.5; }
.chart-grid-line { stroke: #dfe3de; stroke-width: 1; }
.chart-axis-label { fill: #758079; font: 9px DM Mono, monospace; }
.chart-line { fill: none; stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; }
.published-chart .chart-line { stroke: var(--orange); }
.likely-chart .chart-line { stroke: var(--green); }
.chart-point { fill: var(--card); stroke-width: 1.5; }
.published-chart .chart-point { stroke: var(--orange); }
.likely-chart .chart-point { stroke: var(--green); }
.chart-point.issue { fill: var(--orange-soft); stroke-width: 3; }
.likely-chart .chart-point.issue { fill: var(--mint); }
.chart-cursor { stroke: #6f7973; stroke-width: 1; stroke-dasharray: 4 4; }
.chart-current { fill: var(--ink); stroke: white; stroke-width: 2; }
.correction-context { min-height: 44px; margin-top: 14px; padding: 13px 17px; border-left: 3px solid var(--orange); color: var(--muted); background: rgba(255,255,255,.45); font-size: 11px; line-height: 1.55; }
.correction-context strong { color: var(--ink); }

.demand-calculator { display: grid; grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr); border: 1px solid var(--line); background: var(--card); box-shadow: 0 20px 60px rgba(38,52,44,.07); }
.demand-inputs, .demand-results { position: relative; padding: 42px 48px 46px; }
.demand-inputs { border-right: 1px solid var(--line); }
.demand-results { background: #edf3ed; }
.select-label { display: block; margin-bottom: 10px; color: var(--muted); font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; }
#consumer-select { width: 100%; min-height: 58px; padding: 10px 42px 10px 14px; border: 1px solid var(--line); border-radius: 7px; outline: 0; color: var(--ink); background: #f6f7f3; font-size: 12px; line-height: 1.4; }
#consumer-select:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(30,101,73,.1); }
.consumer-unit { margin: 8px 0 27px; color: var(--muted); font-size: 10px; }
.segmented.three { grid-template-columns: repeat(3, 1fr); }
.segmented.three span { min-height: 54px; }
.demand-field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.demand-field > span { display: flex; justify-content: space-between; margin-bottom: 8px; color: var(--muted); font-size: 10px; font-weight: 700; text-transform: uppercase; }
.demand-field > span b { color: var(--green); font: 500 13px/1 DM Mono, monospace; }
.demand-field input { width: 100%; height: 62px; padding: 0 14px; border: 0; border-bottom: 2px solid var(--green); outline: 0; background: #f6f7f3; font: 500 23px/1 DM Mono, monospace; }
.demand-field input:focus { background: #f0f5ef; }
.source-parameters { margin-top: 25px; padding: 16px 18px; border: 1px solid var(--line); background: #f8f8f4; }
.parameter-heading { display: flex; justify-content: space-between; align-items: center; color: var(--green-dark); font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; }
.parameter-heading button { border: 0; background: transparent; font-size: 17px; cursor: pointer; }
.parameter-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 16px; }
.parameter-grid > div { display: flex; flex-direction: column; gap: 5px; }
.parameter-grid span { color: var(--muted); font: 500 10px/1 DM Mono, monospace; }
.parameter-grid strong { font: 500 12px/1.3 DM Mono, monospace; }
.source-parameters.collapsed .parameter-grid { display: none; }
.consumer-note { min-height: 0; margin: 10px 0 0; color: #98502f; font-size: 10px; line-height: 1.5; }
.flow-results { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 30px 0 26px; }
.flow-result { min-width: 0; padding: 18px; border-top: 3px solid var(--green); background: rgba(255,255,255,.5); }
.hourly-flow { border-color: var(--orange); }
.flow-kicker { display: block; min-height: 26px; color: var(--muted); font: 500 9px/1.4 DM Mono, monospace; text-transform: uppercase; }
.flow-result > div { display: flex; align-items: baseline; gap: 7px; margin: 12px 0 10px; }
.flow-result strong { font: 500 clamp(28px,3.1vw,42px)/1 DM Mono, monospace; letter-spacing: -.06em; }
.flow-result b { color: var(--green); font: 500 11px/1 DM Mono, monospace; }
.hourly-flow b { color: var(--orange); }
.flow-result code { color: var(--muted); font: 400 9px/1.4 DM Mono, monospace; }
.calculation-path { border-top: 1px solid #cbd4cc; }
.calculation-path > div { display: grid; grid-template-columns: 1fr 110px; gap: 12px; padding: 11px 0; border-bottom: 1px solid #d7dfd8; font-size: 11px; }
.calculation-path strong { text-align: right; font: 500 12px/1 DM Mono, monospace; }
.calculation-path b { color: var(--green-dark); }
.calculation-path .path-head { padding-top: 13px; color: var(--muted); font: 500 9px/1 DM Mono, monospace; text-transform: uppercase; }
.calculation-path .path-head span:last-child { text-align: right; }
.calculation-path .path-head.hour { margin-top: 8px; }
.daily-results { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 22px; background: #cdd7ce; border: 1px solid #cdd7ce; }
.daily-results > div { display: flex; flex-direction: column; gap: 7px; padding: 13px 15px; background: rgba(255,255,255,.65); }
.daily-results span { color: var(--muted); font-size: 9px; text-transform: uppercase; }
.daily-results strong { font: 500 12px/1 DM Mono, monospace; }
.demand-comparison { display: flex; justify-content: space-between; gap: 18px; margin-top: 14px; padding: 13px 15px; border-left: 3px solid var(--orange); background: var(--orange-soft); font-size: 10px; }
.demand-comparison > span { text-align: right; font-family: DM Mono, monospace; }
.demand-formula { margin-top: 18px; }
.demand-formula code + code { margin-top: 6px; }
.demand-notice { max-width: 1000px; }

.catalog { border: 1px solid var(--line); background: var(--card); box-shadow: 0 20px 60px rgba(38,52,44,.07); }
.catalog-toolbar { position: relative; display: grid; grid-template-columns: 1.3fr .7fr; gap: 48px; padding: 36px 42px 30px; border-bottom: 1px solid var(--line); }
.catalog-toolbar > div:first-child { position: relative; }
.catalog-toolbar h2 { margin-bottom: 20px; }
.catalog-types { display: flex; flex-wrap: wrap; gap: 7px; }
.catalog-types button { padding: 10px 13px; border: 1px solid var(--line); border-radius: 6px; color: var(--muted); background: #f4f5f1; font-size: 11px; font-weight: 700; cursor: pointer; }
.catalog-types button b { margin-left: 5px; color: #929c96; font: 500 9px/1 DM Mono, monospace; }
.catalog-types button.active { border-color: var(--green); color: white; background: var(--green); }
.catalog-types button.active b { color: #c7dfd1; }
.catalog-search { align-self: end; }
.catalog-search > span { display: block; margin-bottom: 9px; color: var(--muted); font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; }
.catalog-search > div { position: relative; }
.catalog-search > div > span { position: absolute; left: 15px; top: 50%; transform: translateY(-53%); color: var(--green); font-size: 24px; }
.catalog-search input { width: 100%; height: 50px; padding: 0 42px; border: 1px solid var(--line); border-radius: 6px; outline: 0; background: #f6f7f3; font-size: 12px; }
.catalog-search input:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(30,101,73,.1); }
.catalog-search button { position: absolute; right: 8px; top: 8px; width: 34px; height: 34px; border: 0; border-radius: 50%; color: var(--muted); background: transparent; font-size: 19px; cursor: pointer; }
.catalog-search button:hover { color: var(--ink); background: #e5e9e4; }
.catalog-summary { display: flex; justify-content: space-between; gap: 20px; padding: 14px 42px; border-bottom: 1px solid var(--line); color: var(--muted); background: #f7f7f3; font: 500 9px/1.4 DM Mono, monospace; text-transform: uppercase; letter-spacing: .04em; }
.catalog-summary p { margin: 0; }
.catalog-summary > span { color: var(--green-dark); }
.catalog-results { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 22px; background: #ecefe9; }
.catalog-card { min-width: 0; border: 1px solid var(--line); background: var(--card); }
.catalog-card > header { display: grid; grid-template-columns: 32px 1fr; gap: 12px; min-height: 112px; padding: 18px; border-bottom: 1px solid var(--line); }
.catalog-index { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; color: white; background: var(--green); font: 500 9px/1 DM Mono, monospace; }
.catalog-card header small { display: block; margin: 2px 0 7px; color: var(--green); font: 500 8px/1.3 DM Mono, monospace; text-transform: uppercase; letter-spacing: .06em; }
.catalog-card h3 { margin: 0; font-size: 13px; line-height: 1.45; }
.catalog-card header p { margin: 8px 0 0; color: var(--muted); font-size: 9px; }
.catalog-section-label { padding: 11px 18px 8px; color: var(--muted); font: 500 8px/1 DM Mono, monospace; text-transform: uppercase; letter-spacing: .05em; }
.catalog-metrics { display: grid; grid-template-columns: repeat(3, 1fr); padding: 0 18px 13px; }
.catalog-metric { min-width: 0; display: flex; flex-direction: column; gap: 5px; padding: 8px 10px; border-left: 1px solid var(--line); }
.catalog-metric:first-child { border-left: 0; }
.catalog-metric span { color: var(--muted); font-size: 8px; line-height: 1.3; text-transform: uppercase; }
.catalog-metric strong { white-space: nowrap; font: 500 13px/1 DM Mono, monospace; }
.catalog-metric small { margin-left: 4px; color: var(--muted); font: 400 8px/1 DM Mono, monospace; }
.catalog-metrics.compact { padding-bottom: 16px; }
.catalog-metrics.compact .catalog-metric strong { font-size: 11px; }
.catalog-bottom { display: grid; grid-template-columns: repeat(4, 1fr); padding: 10px 8px; border-top: 1px solid var(--line); background: #f5f6f2; }
.catalog-bottom.two { grid-template-columns: 1fr 1fr; }
.consumer-card > header { min-height: 144px; }
.consumer-card .catalog-metrics { padding-bottom: 19px; }
.catalog-warning { margin: 0; padding: 11px 18px; border-top: 1px solid #edcbbb; color: #8d4a2d; background: var(--orange-soft); font-size: 9px; line-height: 1.5; }
.catalog-results.wastewater { display: block; padding: 0; background: var(--card); }
.wastewater-row { display: grid; grid-template-columns: 45px 1fr 100px; gap: 16px; align-items: center; min-height: 74px; padding: 14px 34px; border-bottom: 1px solid var(--line); }
.wastewater-row:last-child { border-bottom: 0; }
.wastewater-row h3 { margin: 0; font-size: 12px; font-weight: 600; line-height: 1.5; }
.wastewater-row > div { display: flex; align-items: baseline; justify-content: flex-end; gap: 6px; }
.wastewater-row strong { color: var(--green-dark); font: 500 23px/1 DM Mono, monospace; }
.wastewater-row small { color: var(--muted); font: 400 9px/1 DM Mono, monospace; }
.catalog-empty { padding: 72px 24px; text-align: center; }
.catalog-empty strong { font-size: 18px; }
.catalog-empty p { margin: 8px 0 0; color: var(--muted); font-size: 12px; }
.catalog-notice { max-width: 1000px; }

.engineering-calculator { display: grid; grid-template-columns: minmax(0,.9fr) minmax(0,1.1fr); border: 1px solid var(--line); background: var(--card); box-shadow: 0 20px 60px rgba(38,52,44,.07); }
.engineering-inputs, .engineering-results { position: relative; padding: 42px 48px 46px; }
.engineering-inputs { border-right: 1px solid var(--line); }
.engineering-results { background: #edf3ed; }
.engineering-field { display: block; margin-bottom: 22px; }
.engineering-field > span { display: flex; justify-content: space-between; gap: 14px; margin-bottom: 9px; color: var(--muted); font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; }
.engineering-field > span b { color: var(--green); font: 500 12px/1 DM Mono,monospace; text-transform: none; }
.engineering-field > div { position: relative; }
.engineering-field input, .engineering-field select { width: 100%; height: 58px; padding: 0 56px 0 14px; border: 1px solid var(--line); border-radius: 6px; outline: 0; background: #f6f7f3; font: 500 18px/1 DM Mono,monospace; }
.engineering-field select { padding-right: 40px; font: 500 11px/1.35 Manrope,sans-serif; }
.engineering-field input:focus, .engineering-field select:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(30,101,73,.1); }
.engineering-field div small { position: absolute; right: 14px; top: 50%; transform: translateY(-50%); color: var(--green); font: 500 9px/1 DM Mono,monospace; }
.engineering-subhead { display: flex; justify-content: space-between; gap: 12px; margin: 31px 0 17px; padding-top: 20px; border-top: 1px solid var(--line); }
.engineering-subhead span { color: var(--green-dark); font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; }
.engineering-subhead small { color: var(--muted); font: 400 8px/1.4 DM Mono,monospace; text-align: right; }
.material-mode { margin-bottom: 18px; }
.material-mode .segmented span { min-height: 52px; }
.material-mode .segmented span b { font: 500 12px/1.2 DM Mono,monospace; }
.engineering-field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.engineering-help { margin: -5px 0 0; color: var(--muted); font-size: 9px; line-height: 1.5; }
.engineering-primary { padding: 20px 22px; border-top: 3px solid var(--green); background: rgba(255,255,255,.55); }
.engineering-results > .engineering-primary { margin-top: 30px; }
.engineering-primary > span { color: var(--muted); font: 500 9px/1.4 DM Mono,monospace; text-transform: uppercase; }
.engineering-primary > div { display: flex; align-items: baseline; gap: 8px; margin: 15px 0 12px; }
.engineering-primary strong { font: 500 clamp(35px,4vw,54px)/1 DM Mono,monospace; letter-spacing: -.06em; }
.engineering-primary b { color: var(--green); font: 500 11px/1 DM Mono,monospace; }
.engineering-primary code { color: var(--muted); font: 400 9px/1.5 DM Mono,monospace; }
.engineering-checks { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; margin-top: 18px; border: 1px solid #cdd7ce; background: #cdd7ce; }
.engineering-checks > div { min-width: 0; padding: 14px 12px; background: rgba(255,255,255,.65); }
.engineering-checks span, .engineering-checks small { display: block; color: var(--muted); font-size: 8px; line-height: 1.35; }
.engineering-checks strong { display: block; margin: 8px 0 6px; font: 500 10px/1.3 DM Mono,monospace; }
.engineering-checks .passed { box-shadow: inset 0 3px var(--green); }
.engineering-checks .failed { box-shadow: inset 0 3px var(--orange); background: var(--orange-soft); }
.engineering-guidance { margin-top: 16px; padding: 15px 17px; border-left: 3px solid var(--green); background: rgba(255,255,255,.48); }
.engineering-guidance.warning { border-color: var(--orange); background: var(--orange-soft); }
.engineering-guidance strong { font-size: 11px; }
.engineering-guidance p { margin: 5px 0 0; color: var(--muted); font-size: 9px; line-height: 1.55; }
.engineering-formula { margin-top: 18px; }
.rain-primary-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 12px; margin-top: 30px; }
.rain-primary-grid .engineering-primary.secondary { border-color: var(--orange); }
.rain-primary-grid .engineering-primary.secondary b { color: var(--orange); }
.rain-primary-grid .engineering-primary strong { font-size: clamp(27px,3vw,42px); }
.rain-recommendation { display: grid; grid-template-columns: 1.2fr 1fr .8fr; gap: 1px; margin-top: 18px; border: 1px solid #cdd7ce; background: #cdd7ce; }
.rain-recommendation > div { display: flex; flex-direction: column; gap: 8px; padding: 14px; background: rgba(255,255,255,.65); }
.rain-recommendation span { min-height: 24px; color: var(--muted); font-size: 8px; line-height: 1.4; text-transform: uppercase; }
.rain-recommendation strong { font: 500 13px/1.2 DM Mono,monospace; }
.rain-path { margin-top: 19px; }
.hydraulic-limit-fields { grid-template-columns: 1fr 1fr; }
.hydraulic-limit-fields .engineering-field:first-child { grid-column: 1 / -1; }
.hydraulic-limit-fields .engineering-field { min-width: 0; }
.hydraulic-limit-fields select { padding-left: 9px; font-size: 9px; }
.hydraulic-primary-grid { grid-template-columns: 1fr 1fr; }
.hydraulic-summary, .tank-summary { grid-template-columns: repeat(3,1fr); }
.tank-primary { margin-top: 30px; }

.reference-library { border: 1px solid var(--line); background: var(--card); box-shadow: 0 20px 60px rgba(38,52,44,.07); }
.reference-toolbar { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 30px 42px; border-bottom: 1px solid var(--line); }
.reference-toolbar h2 { margin: 0; }
.reference-content { padding: 30px 42px 38px; }
.pressure-converter { display: grid; grid-template-columns: minmax(220px,.65fr) minmax(0,1.35fr); gap: 34px; }
.pressure-converter > div:first-child { padding-right: 34px; border-right: 1px solid var(--line); }
.pressure-results { display: grid; grid-template-columns: repeat(2,1fr); gap: 1px; align-content: start; border: 1px solid var(--line); background: var(--line); }
.pressure-results > div { display: flex; flex-direction: column; gap: 9px; min-width: 0; padding: 17px 19px; background: #f6f7f3; }
.pressure-results span { color: var(--muted); font: 500 9px/1 DM Mono,monospace; text-transform: uppercase; }
.pressure-results strong { overflow-wrap: anywhere; font: 500 16px/1.25 DM Mono,monospace; }
.reference-table { overflow-x: auto; border: 1px solid var(--line); }
.reference-row-table { display: grid; grid-template-columns: minmax(260px,2fr) repeat(4,minmax(85px,.6fr)); min-width: 680px; border-top: 1px solid var(--line); }
.reference-row-table:first-child { border-top: 0; }
.reference-row-table span { padding: 15px 13px; border-left: 1px solid var(--line); font: 500 10px/1.45 DM Mono,monospace; text-align: right; }
.reference-row-table span:first-child { border-left: 0; font-family: Manrope,sans-serif; text-align: left; }
.reference-row-table.head { color: var(--muted); background: #eef2ed; text-transform: uppercase; }
.reference-row-table.head span { font: 500 8px/1.3 DM Mono,monospace; }
.reference-row-table.heights { grid-template-columns: minmax(250px,1.7fr) repeat(4,minmax(120px,1fr)); min-width: 760px; }
.reference-footnote { margin: 0; padding: 13px 15px; border-top: 1px solid var(--line); color: var(--muted); font-size: 9px; }
.reference-search { display: block; width: min(430px,100%); margin: 0 0 20px; }

.notice { display: grid; grid-template-columns: 34px 1fr; gap: 14px; max-width: 920px; margin: 28px auto 0; padding: 18px 22px; color: #58635d; }
.notice-icon { display: grid; place-items: center; width: 26px; height: 26px; border: 1px solid #9eaaa3; border-radius: 50%; font: 500 12px/1 DM Mono, monospace; }
.notice strong { color: var(--ink); font-size: 12px; }
.notice p { margin: 5px 0 0; font-size: 11px; line-height: 1.6; }
footer { display: flex; justify-content: space-between; gap: 24px; margin-top: 64px; padding: 25px 0 34px; border-top: 1px solid var(--line); color: var(--muted); font: 500 10px/1.4 DM Mono, monospace; text-transform: uppercase; }

@media (max-width: 800px) {
  .shell { width: min(100% - 24px, 620px); }
  .site-header { min-height: 82px; }
  .hero { padding: 52px 4px 36px; }
  .hero h1 { font-size: clamp(42px, 13vw, 62px); }
  .calculator { grid-template-columns: 1fr; }
  .input-panel { border-right: 0; border-bottom: 1px solid var(--line); }
  .input-panel, .result-panel { padding: 34px 26px 38px; }
  .main-result { margin-top: 32px; }
  .charts-heading { align-items: flex-start; flex-direction: column; gap: 20px; }
  .chart-grid { grid-template-columns: 1fr; }
  .demand-calculator { grid-template-columns: 1fr; }
  .demand-inputs { border-right: 0; border-bottom: 1px solid var(--line); }
  .demand-inputs, .demand-results { padding: 34px 26px 38px; }
  .catalog-toolbar { grid-template-columns: 1fr; gap: 25px; padding: 30px 26px 26px; }
  .catalog-results { grid-template-columns: 1fr; }
  .engineering-calculator { grid-template-columns: 1fr; }
  .engineering-inputs { border-right: 0; border-bottom: 1px solid var(--line); }
  .engineering-inputs, .engineering-results { padding: 34px 26px 38px; }
  .reference-toolbar { align-items: flex-start; flex-direction: column; padding: 28px 26px; }
  .reference-content { padding: 24px 26px 30px; }
  .pressure-converter { grid-template-columns: 1fr; }
  .pressure-converter > div:first-child { padding-right: 0; border-right: 0; border-bottom: 1px solid var(--line); }
}
@media (max-width: 480px) {
  .source-link { gap: 8px; font-size: 10px; }
  .brand { font-size: 10px; }
  .brand-mark { width: 38px; height: 38px; }
  .segmented { grid-template-columns: 1fr; }
  .segmented.three { grid-template-columns: repeat(3, 1fr); }
  .result-comparison { grid-template-columns: 1fr; }
  .main-result { margin-top: 14px; }
  .reference-head, .reference-row { grid-template-columns: 1fr 72px 72px; gap: 8px; }
  .tool-tabs { overflow-x: auto; }
  .tool-tabs button { flex: 0 0 auto; }
  .demand-field-grid, .flow-results { grid-template-columns: 1fr; }
  .demand-comparison { flex-direction: column; }
  .demand-comparison > span { text-align: left; }
  .catalog-types { display: grid; grid-template-columns: 1fr; }
  .catalog-summary { padding: 13px 18px; flex-direction: column; gap: 5px; }
  .catalog-results { padding: 10px; }
  .catalog-card > header { min-height: 0; }
  .catalog-metrics { padding-left: 8px; padding-right: 8px; }
  .catalog-metric { padding: 8px 7px; }
  .catalog-metric strong { font-size: 11px; }
  .catalog-bottom { grid-template-columns: 1fr 1fr; }
  .catalog-bottom .catalog-metric:nth-child(3) { border-left: 0; }
  .consumer-card .catalog-bottom { grid-template-columns: 1fr; }
  .consumer-card .catalog-bottom .catalog-metric + .catalog-metric { border-left: 0; border-top: 1px solid var(--line); }
  .wastewater-row { grid-template-columns: 34px 1fr; padding: 15px 16px; }
  .wastewater-row > div { grid-column: 2; justify-content: flex-start; }
  .engineering-field-grid, .rain-primary-grid { grid-template-columns: 1fr; }
  .hydraulic-limit-fields { grid-template-columns: 1fr; }
  .hydraulic-limit-fields .engineering-field:first-child { grid-column: auto; }
  .engineering-checks { grid-template-columns: 1fr; }
  .rain-recommendation { grid-template-columns: 1fr; }
  .rain-recommendation span { min-height: 0; }
  .pressure-results { grid-template-columns: 1fr; }
  .reference-types { width: 100%; }
  footer { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }