:root {
  --cs-ink: #11120f;
  --cs-paper: #f3f0e8;
  --cs-card: #fbfaf5;
  --cs-line: #c9c5b8;
  --cs-muted: #66685e;
  --cs-signal: #c9ff31;
  --cs-signal-dark: #263a00;
  --cs-arabica: #dc562e;
  --cs-robusta: #2667ff;
  --cs-radius: 3px;
  --cs-max: 1180px;
}

html { scroll-behavior: smooth; }
body.coffee-signal-product {
  margin: 0;
  background: var(--cs-paper);
  color: var(--cs-ink);
  font-family: "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}
body.coffee-signal-product * { box-sizing: border-box; }
body.coffee-signal-product a { color: inherit; }
.cs-site .cs-shell { min-height: 100vh; overflow: hidden; }
.cs-skip { position: fixed; left: 12px; top: -80px; z-index: 99999; padding: 10px 16px; background: var(--cs-signal); color: var(--cs-ink); font-weight: 700; }
.cs-skip:focus { top: 12px; }
.cs-header {
  width: min(calc(100% - 40px), var(--cs-max));
  margin: 0 auto;
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--cs-ink);
}
.cs-brand { display: inline-flex; align-items: center; gap: 11px; font-size: 14px; font-weight: 900; letter-spacing: .12em; text-decoration: none; }
.cs-brand-mark { width: 13px; height: 13px; border-radius: 50%; background: var(--cs-signal); border: 2px solid var(--cs-ink); box-shadow: 5px 0 0 var(--cs-ink); }
.cs-nav { display: flex; gap: 28px; font-size: 13px; font-weight: 700; }
.cs-nav a { position: relative; text-decoration: none; }
.cs-nav a[aria-current="page"]::after, .cs-nav a:hover::after { content: ""; position: absolute; left: 0; right: 0; bottom: -8px; height: 3px; background: var(--cs-signal); border: 1px solid var(--cs-ink); }
.cs-main { outline: none; }
.cs-grid-bg {
  background-image: linear-gradient(to right, rgba(17,18,15,.07) 1px, transparent 1px), linear-gradient(to bottom, rgba(17,18,15,.07) 1px, transparent 1px);
  background-size: 32px 32px;
}
.cs-hero, .cs-page-header { width: min(calc(100% - 40px), var(--cs-max)); margin: 0 auto; }
.cs-hero { padding: clamp(72px, 10vw, 138px) clamp(0px, 4vw, 58px) 100px; border-bottom: 1px solid var(--cs-ink); }
.cs-eyebrow, .cs-kicker { margin: 0 0 20px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.cs-eyebrow::before, .cs-kicker::before { content: ""; display: inline-block; width: 26px; height: 8px; margin-right: 10px; background: var(--cs-signal); border: 1px solid var(--cs-ink); }
.cs-hero h1 { max-width: 940px; margin: 0; font-size: clamp(48px, 8vw, 104px); line-height: 1.05; letter-spacing: -.055em; font-weight: 900; }
.cs-hero h1 span { text-decoration: underline; text-decoration-color: var(--cs-signal); text-decoration-thickness: .2em; text-underline-offset: -.08em; text-decoration-skip-ink: none; }
.cs-lede { max-width: 720px; margin: 38px 0 0; font-size: clamp(17px, 2vw, 22px); line-height: 1.8; font-weight: 650; }
.cs-hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 42px; }
.cs-button { display: inline-flex; min-height: 52px; align-items: center; justify-content: center; padding: 0 22px; border: 1px solid var(--cs-ink); background: var(--cs-card); text-decoration: none; font-weight: 800; box-shadow: 4px 4px 0 var(--cs-ink); transition: transform .16s ease, box-shadow .16s ease; }
.cs-button:hover { transform: translate(2px,2px); box-shadow: 2px 2px 0 var(--cs-ink); }
.cs-button-primary { background: var(--cs-signal); }
.cs-section { width: min(calc(100% - 40px), var(--cs-max)); margin: 0 auto; padding: 88px 0; border-bottom: 1px solid var(--cs-ink); }
.cs-section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 32px; }
.cs-section h2 { margin: 0; font-size: clamp(29px, 4vw, 48px); line-height: 1.15; letter-spacing: -.035em; }
.cs-section h3 { line-height: 1.35; }
.cs-section-intro { max-width: 820px; margin: -10px 0 32px; color: var(--cs-muted); font-size: clamp(16px, 2vw, 19px); }
.cs-freshness { margin: 0; padding: 6px 10px; border: 1px solid var(--cs-ink); background: var(--cs-card); font-family: ui-monospace, monospace; font-size: 12px; }
.cs-metric-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--cs-ink); border-left: 1px solid var(--cs-ink); }
.cs-metric-card { min-width: 0; padding: 28px; border-right: 1px solid var(--cs-ink); border-bottom: 1px solid var(--cs-ink); background: var(--cs-card); }
.cs-metric-card > p:first-child { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 0 0 24px; font-weight: 800; }
.cs-metric-card strong { display: block; font-size: clamp(31px, 4vw, 50px); line-height: 1; letter-spacing: -.04em; }
.cs-metric-card strong small { font-size: 13px; letter-spacing: 0; }
.cs-tag { padding: 3px 7px; border: 1px solid currentColor; font-size: 10px; font-family: ui-monospace, monospace; }
.cs-delta { margin: 22px 0 0; color: #9c2d11; font-weight: 800; }
.cs-delta.is-down { color: #1246bb; }
.cs-metric-card-note { background: var(--cs-ink); color: var(--cs-paper); }
.cs-metric-card-note strong { font-size: clamp(23px, 3vw, 35px); color: var(--cs-signal); }
.cs-metric-card-note > p:last-child { color: #caccc1; font-size: 14px; }
.cs-positive-note strong { color: var(--cs-signal); }
.cs-cup-signal-card .cs-signal-original { margin: 20px 0 0; color: var(--cs-muted); font-family: ui-monospace, monospace; font-size: 12px; }
.cs-fineprint { margin: 16px 0 0; color: var(--cs-muted); font-size: 11px; line-height: 1.65; }
.cs-fineprint a { text-underline-offset: 3px; }
.cs-retail-summary { max-width: 920px; margin: -2px 0 32px; font-size: clamp(22px, 3.3vw, 38px); line-height: 1.45; letter-spacing: -.035em; }
.cs-retail-summary strong { background: linear-gradient(transparent 62%, var(--cs-signal) 62%); }
.cs-retail-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--cs-ink); border-left: 1px solid var(--cs-ink); }
.cs-retail-card { min-height: 270px; display: flex; flex-direction: column; padding: 24px; border-right: 1px solid var(--cs-ink); border-bottom: 1px solid var(--cs-ink); background: var(--cs-card); }
.cs-retail-card > span { font-family: ui-monospace, monospace; font-size: 10px; font-weight: 900; }
.cs-retail-card > strong { display: block; margin-top: 36px; font-size: clamp(38px, 4.5vw, 58px); line-height: 1; letter-spacing: -.055em; }
.cs-retail-card > strong small { display: block; margin-top: 8px; font-size: 11px; letter-spacing: 0; }
.cs-retail-card > p { margin: 20px 0 0; color: var(--cs-muted); font-size: 13px; }
.cs-retail-card > em { margin-top: auto; color: var(--cs-muted); font-family: ui-monospace, monospace; font-size: 10px; font-style: normal; }
.cs-retail-card:first-child { background: var(--cs-signal); }
.cs-stage-grid { display: grid; grid-template-columns: repeat(4, 1fr); margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--cs-ink); border-left: 1px solid var(--cs-ink); }
.cs-stage-grid li { min-height: 250px; display: flex; flex-direction: column; padding: 24px; border-right: 1px solid var(--cs-ink); border-bottom: 1px solid var(--cs-ink); background: var(--cs-card); }
.cs-stage-grid li > span { font-family: ui-monospace, monospace; font-weight: 800; }
.cs-stage-grid strong { margin-top: 48px; font-size: 20px; }
.cs-stage-grid p { color: var(--cs-muted); font-size: 14px; }
.cs-stage-grid em { margin-top: auto; align-self: flex-start; padding: 3px 8px; border: 1px solid var(--cs-ink); font-family: ui-monospace, monospace; font-size: 11px; font-style: normal; }
.cs-stage-grid li:first-child em { background: var(--cs-signal); }
.cs-note { margin: 20px 0 0; padding-left: 16px; border-left: 4px solid var(--cs-signal); color: var(--cs-muted); font-size: 14px; }
.cs-feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.cs-feature { min-height: 300px; display: flex; flex-direction: column; padding: 30px; border: 1px solid var(--cs-ink); background: var(--cs-card); box-shadow: 6px 6px 0 var(--cs-ink); text-decoration: none; }
.cs-feature:hover { background: var(--cs-signal); }
.cs-feature > span { font-family: ui-monospace, monospace; font-size: 11px; font-weight: 800; }
.cs-feature h3 { max-width: 440px; margin: 50px 0 10px; font-size: clamp(25px, 3vw, 38px); letter-spacing: -.03em; }
.cs-feature p { max-width: 520px; margin: 0; color: var(--cs-muted); }
.cs-feature b { margin-top: auto; }
.cs-page-header { padding: 84px clamp(0px, 4vw, 58px) 72px; border-bottom: 1px solid var(--cs-ink); }
.cs-page-header h1 { max-width: 950px; margin: 0; font-size: clamp(45px, 7vw, 84px); line-height: 1.08; letter-spacing: -.05em; }
.cs-page-header > p:last-child { max-width: 760px; margin: 28px 0 0; font-size: clamp(17px, 2vw, 21px); font-weight: 600; }
.cs-page-header .cs-answer { padding: 24px; border: 1px solid var(--cs-ink); background: var(--cs-card); box-shadow: 5px 5px 0 var(--cs-ink); }
.cs-answer strong { background: linear-gradient(transparent 55%, var(--cs-signal) 55%); }
.cs-price-header .cs-price-answer { max-width: 970px; display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 15px; margin-top: 34px; font-size: clamp(17px, 2.2vw, 25px); }
.cs-price-answer > span { width: 100%; font-family: ui-monospace, monospace; font-size: 12px; letter-spacing: .05em; }
.cs-price-answer strong { padding: 0 5px; background: linear-gradient(transparent 55%, var(--cs-signal) 55%); font-size: clamp(27px, 4vw, 46px); line-height: 1.2; }
.cs-price-answer small { width: 100%; color: var(--cs-muted); font-size: 11px; font-weight: 500; }
.cs-definition-bar { display: grid; grid-template-columns: 2fr repeat(3, 1fr); border: 1px solid var(--cs-ink); background: var(--cs-ink); color: var(--cs-paper); }
.cs-definition-bar div { padding: 16px 18px; border-right: 1px solid #4b4d45; }
.cs-definition-bar span, .cs-definition-bar strong { display: block; }
.cs-definition-bar span { color: #aeb0a6; font-size: 10px; font-family: ui-monospace, monospace; }
.cs-definition-bar strong { font-size: 13px; }
.cs-metric-grid-compact { grid-template-columns: repeat(2, 1fr); margin-top: 20px; }
.cs-chart-toolbar { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 20px; margin: 34px 0 18px; }
.cs-chart-toolbar fieldset { display: flex; gap: 6px; margin: 0; padding: 0; border: 0; }
.cs-chart-toolbar legend { float: left; margin-right: 10px; padding-top: 8px; font-size: 12px; font-weight: 800; }
.cs-chart-toolbar button { min-height: 38px; padding: 0 14px; border: 1px solid var(--cs-ink); background: transparent; color: var(--cs-ink); font: inherit; font-size: 12px; font-weight: 800; cursor: pointer; }
.cs-chart-toolbar button.is-active { background: var(--cs-signal); box-shadow: 2px 2px 0 var(--cs-ink); }
.cs-legend { display: flex; gap: 22px; font-size: 12px; font-weight: 800; }
.cs-legend span::before { content: ""; display: inline-block; width: 24px; height: 4px; margin-right: 8px; vertical-align: middle; background: currentColor; }
.cs-legend .arabica { color: var(--cs-arabica); }
.cs-legend .robusta { color: var(--cs-robusta); }
.cs-chart-wrap { position: relative; margin-top: 12px; border: 1px solid var(--cs-ink); background: var(--cs-card); }
.cs-chart { display: block; width: 100%; height: auto; min-height: 280px; }
.cs-chart-grid line { stroke: #d9d5c9; stroke-width: 1; }
.cs-chart-grid text, .cs-chart-axis text { fill: var(--cs-muted); font-size: 12px; font-family: ui-monospace, monospace; }
.cs-series { fill: none; stroke-width: 3; vector-effect: non-scaling-stroke; }
.cs-series.arabica { stroke: var(--cs-arabica); }
.cs-series.robusta { stroke: var(--cs-robusta); }
.cs-series-dot { stroke: var(--cs-card); stroke-width: 2; }
.cs-series-dot.arabica { fill: var(--cs-arabica); }
.cs-series-dot.robusta { fill: var(--cs-robusta); }
.cs-chart-state { margin: 0; padding: 10px 16px; border-top: 1px solid var(--cs-ink); font-family: ui-monospace, monospace; font-size: 11px; }
.cs-chart-state.is-error { color: #a42916; }
.cs-data-table { margin-top: 26px; border: 1px solid var(--cs-ink); background: var(--cs-card); }
.cs-data-table summary { padding: 14px 18px; cursor: pointer; font-weight: 800; }
.cs-table-scroll { overflow-x: auto; }
.cs-data-table table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.cs-data-table th, .cs-data-table td { padding: 12px 18px; border-top: 1px solid var(--cs-line); text-align: right; white-space: nowrap; }
.cs-data-table th:first-child, .cs-data-table td:first-child { text-align: left; }
.cs-three-columns { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 28px; border-top: 1px solid var(--cs-ink); border-left: 1px solid var(--cs-ink); }
.cs-three-columns article { padding: 25px; border-right: 1px solid var(--cs-ink); border-bottom: 1px solid var(--cs-ink); background: var(--cs-card); }
.cs-three-columns article > span { font-family: ui-monospace, monospace; font-size: 11px; font-weight: 800; }
.cs-three-columns h3 { margin: 34px 0 8px; font-size: 21px; }
.cs-three-columns p { color: var(--cs-muted); font-size: 14px; }
.cs-text-link { font-weight: 900; text-decoration-thickness: 2px; text-underline-offset: 5px; }
.cs-cup-calculator { display: grid; grid-template-columns: minmax(0, .9fr) minmax(420px, 1.1fr); gap: clamp(34px, 7vw, 90px); align-items: start; }
.cs-cup-calculator-copy { padding-top: 8px; }
.cs-big-answer { margin: 0 0 24px; font-size: clamp(22px, 3vw, 34px); line-height: 1.45; letter-spacing: -.025em; }
.cs-big-answer strong { background: linear-gradient(transparent 62%, var(--cs-signal) 62%); }
.cs-cup-calculator-copy > p:not(.cs-big-answer) { max-width: 580px; color: var(--cs-muted); }
.cs-preset-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.cs-preset-row button { padding: 7px 10px; border: 1px solid var(--cs-ink); background: var(--cs-card); color: var(--cs-ink); font: inherit; font-size: 11px; font-weight: 800; cursor: pointer; }
.cs-preset-row button:hover, .cs-preset-row button:focus-visible { background: var(--cs-signal); }
.cs-calculator { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(30px, 8vw, 100px); }
.cs-calculator-copy h2 { margin-bottom: 20px; }
.cs-calculator-copy ul { margin: 28px 0 0; padding-left: 20px; color: var(--cs-muted); }
.cs-calc-form { align-self: start; padding: 30px; border: 1px solid var(--cs-ink); background: var(--cs-card); box-shadow: 7px 7px 0 var(--cs-ink); }
.cs-calc-form label { display: block; margin-bottom: 20px; font-size: 13px; font-weight: 800; }
.cs-calc-form input { display: block; width: 100%; margin-top: 7px; padding: 13px 14px; border: 1px solid var(--cs-ink); border-radius: 0; background: white; color: var(--cs-ink); font: inherit; font-size: 20px; }
.cs-form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 14px; }
.cs-form-grid label:first-child { grid-column: 1 / -1; }
.cs-primary-result { margin-top: 8px; padding: 22px; border: 1px solid var(--cs-ink); background: var(--cs-signal); }
.cs-primary-result > span { display: block; font-size: 12px; font-weight: 800; }
.cs-primary-result strong { display: flex; align-items: baseline; gap: 8px; margin-top: 6px; line-height: 1; }
.cs-primary-result strong > b { font-size: clamp(48px, 7vw, 76px); letter-spacing: -.06em; }
.cs-primary-result strong small { font-size: 14px; }
.cs-primary-result p { margin: 10px 0 0; font-size: 13px; }
.cs-calc-results { display: grid; grid-template-columns: 1fr 1fr; margin-top: 28px; border-top: 1px solid var(--cs-ink); border-left: 1px solid var(--cs-ink); }
.cs-calc-results > div { padding: 18px; border-right: 1px solid var(--cs-ink); border-bottom: 1px solid var(--cs-ink); }
.cs-calc-results span, .cs-calc-results small { display: block; font-size: 11px; }
.cs-calc-results strong { display: block; margin: 15px 0 3px; font-size: 35px; line-height: 1; }
.cs-calc-results p { grid-column: 1 / -1; margin: 0; padding: 13px 18px; border-right: 1px solid var(--cs-ink); border-bottom: 1px solid var(--cs-ink); background: #ece8dc; font-size: 12px; }
.cs-form-error { color: #a42916; font-weight: 800; }
.cs-converter-layout { display: grid; grid-template-columns: minmax(260px, .55fr) minmax(0, 1.45fr); gap: 20px; align-items: start; }
.cs-converter-form { box-shadow: none; }
.cs-converter-results { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--cs-ink); border-left: 1px solid var(--cs-ink); }
.cs-converter-results article { min-height: 220px; padding: 28px; border-right: 1px solid var(--cs-ink); border-bottom: 1px solid var(--cs-ink); background: var(--cs-card); }
.cs-converter-results article > span { font-weight: 900; }
.cs-converter-results article > strong { display: block; margin-top: 35px; font-size: clamp(42px, 6vw, 68px); line-height: 1; letter-spacing: -.055em; }
.cs-converter-results article > strong b { font: inherit; }
.cs-converter-results article > strong small { margin-left: 7px; font-size: 14px; letter-spacing: 0; }
.cs-converter-results article > p { margin: 20px 0 0; color: var(--cs-muted); font-family: ui-monospace, monospace; font-size: 12px; }
.cs-converter-results .is-arabica { box-shadow: inset 0 6px 0 var(--cs-arabica); }
.cs-converter-results .is-robusta { box-shadow: inset 0 6px 0 var(--cs-robusta); }
.cs-live-formula { grid-column: 1 / -1; margin: 0; padding: 12px 18px; border-right: 1px solid var(--cs-ink); border-bottom: 1px solid var(--cs-ink); background: #ece8dc; font-family: ui-monospace, monospace; font-size: 11px; }
.cs-source-card { padding: clamp(24px, 5vw, 52px); border: 1px solid var(--cs-ink); background: var(--cs-card); box-shadow: 7px 7px 0 var(--cs-ink); }
.cs-source-card h2 { max-width: 900px; margin-top: 22px; }
.cs-source-status { font-family: ui-monospace, monospace; font-size: 12px; font-weight: 800; }
.cs-status-dot { display: inline-block; width: 10px; height: 10px; margin-right: 8px; border-radius: 50%; background: var(--cs-signal); border: 1px solid var(--cs-ink); }
.cs-source-card dl, .cs-status-list { margin: 32px 0; border-top: 1px solid var(--cs-line); }
.cs-source-card dl > div, .cs-status-list > div { display: grid; grid-template-columns: minmax(150px, .5fr) 2fr; gap: 20px; padding: 13px 0; border-bottom: 1px solid var(--cs-line); }
.cs-source-card dt, .cs-status-list dt { color: var(--cs-muted); font-size: 13px; }
.cs-source-card dd, .cs-status-list dd { margin: 0; font-weight: 700; overflow-wrap: anywhere; }
.cs-method { padding-top: 44px; }
.cs-method article { display: grid; grid-template-columns: 90px 1fr; gap: 25px; padding: 44px 0; border-bottom: 1px solid var(--cs-line); }
.cs-method article:last-child { border-bottom: 0; }
.cs-method-number { font-family: ui-monospace, monospace; font-size: 13px; font-weight: 900; }
.cs-method h2 { font-size: clamp(25px, 3vw, 38px); }
.cs-method p { max-width: 800px; }
.cs-method code { display: inline-block; padding: 8px 12px; border: 1px solid var(--cs-ink); background: var(--cs-card); }
.cs-limitations ul { max-width: 850px; padding-left: 22px; }
.cs-limitations li { margin: 10px 0; }
.cs-health { display: flex; align-items: center; gap: 22px; padding: 28px; border: 1px solid var(--cs-ink); background: var(--cs-card); }
.cs-health-stack { display: grid; gap: 12px; }
.cs-health-icon { width: 25px; height: 25px; border-radius: 50%; border: 2px solid var(--cs-ink); }
.cs-health.is-ok .cs-health-icon { background: var(--cs-signal); box-shadow: 5px 0 0 var(--cs-ink); }
.cs-health.is-error .cs-health-icon { background: var(--cs-arabica); }
.cs-health p { margin: 0; font-family: ui-monospace, monospace; font-size: 11px; font-weight: 800; }
.cs-health h2 { margin-top: 4px; font-size: clamp(24px, 3vw, 36px); }
.cs-status-list { margin-top: 30px; }
.cs-alert { padding: 18px; border: 1px solid #a42916; background: #fff0e8; color: #7c1f10; font-weight: 800; }
.cs-footer { width: min(calc(100% - 40px), var(--cs-max)); margin: 0 auto; display: flex; justify-content: space-between; gap: 30px; padding: 50px 0 70px; }
.cs-footer strong { letter-spacing: .1em; }
.cs-footer p { margin: 5px 0 0; color: var(--cs-muted); font-size: 13px; }
.cs-footer nav { display: flex; flex-wrap: wrap; align-content: start; justify-content: flex-end; gap: 10px 22px; font-size: 12px; font-weight: 700; }

@media (max-width: 800px) {
  .cs-header { min-height: 68px; align-items: flex-start; flex-direction: column; justify-content: center; gap: 8px; padding: 10px 0; }
  .cs-nav { width: 100%; gap: 18px; overflow-x: auto; white-space: nowrap; }
  .cs-nav a[aria-current="page"]::after, .cs-nav a:hover::after { bottom: -3px; }
  .cs-hero { padding-top: 70px; }
  .cs-metric-grid, .cs-stage-grid, .cs-three-columns, .cs-calculator, .cs-cup-calculator, .cs-converter-layout { grid-template-columns: 1fr; }
  .cs-retail-grid { grid-template-columns: repeat(2, 1fr); }
  .cs-feature-grid { grid-template-columns: 1fr; }
  .cs-definition-bar { grid-template-columns: repeat(2, 1fr); }
  .cs-metric-grid-compact { grid-template-columns: 1fr 1fr; }
  .cs-stage-grid li { min-height: 190px; }
  .cs-stage-grid strong { margin-top: 24px; }
  .cs-section-heading { align-items: flex-start; flex-direction: column; }
  .cs-chart-toolbar { flex-direction: column; }
  .cs-chart-toolbar fieldset { flex-wrap: wrap; }
  .cs-chart-toolbar legend { float: none; width: 100%; }
  .cs-footer { flex-direction: column; }
  .cs-footer nav { justify-content: flex-start; }
}

@media (max-width: 520px) {
  .cs-header, .cs-hero, .cs-page-header, .cs-section, .cs-footer { width: min(calc(100% - 24px), var(--cs-max)); }
  .cs-hero h1 { font-size: 48px; }
  .cs-page-header h1 { font-size: 43px; }
  .cs-metric-grid-compact { grid-template-columns: 1fr; }
  .cs-definition-bar { grid-template-columns: 1fr 1fr; }
  .cs-definition-bar div { padding: 12px; }
  .cs-metric-card { padding: 22px; }
  .cs-metric-card strong { font-size: 36px; }
  .cs-method article { grid-template-columns: 1fr; gap: 8px; }
  .cs-source-card dl > div, .cs-status-list > div { grid-template-columns: 1fr; gap: 2px; }
  .cs-calc-form { padding: 20px; }
  .cs-calc-results { grid-template-columns: 1fr; }
  .cs-calc-results p { grid-column: auto; }
  .cs-form-grid, .cs-converter-results { grid-template-columns: 1fr; }
  .cs-form-grid label:first-child, .cs-live-formula { grid-column: auto; }
  .cs-retail-grid { grid-template-columns: 1fr; }
  .cs-retail-card { min-height: 220px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .001ms !important; }
}