@font-face {
  font-family: "Noto Sans SC";
  src: url("../assets/fonts/NotoSansSC-Regular.otf") format("opentype");
  font-display: swap;
  font-style: normal;
  font-weight: 100 900;
}

:root {
  color-scheme: light;
  --bg: #f4f0e8;
  --paper: #fbf8f2;
  --ink: #191613;
  --muted: #706a63;
  --line: #cfc6b8;
  --soft-line: #e4ddd2;
  --accent: #d01920;
  --accent-deep: #9f1117;
  --accent-soft: #f4d8d7;
  --good: #176443;
  --good-soft: #dceae3;
  --bad: #a51f24;
  --black: #11100e;
  --white: #fffdf8;
  --max: 1240px;
  --pad: clamp(20px, 5vw, 72px);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #11100e;
  --paper: #191714;
  --ink: #f4f0e8;
  --muted: #aaa39a;
  --line: #4b4640;
  --soft-line: #302c28;
  --accent: #ff555a;
  --accent-deep: #ff7b7f;
  --accent-soft: #3a2020;
  --good: #6fc59c;
  --good-soft: #183529;
  --bad: #ff797d;
  --black: #f4f0e8;
  --white: #151310;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

button,
input { font: inherit; }

button { color: inherit; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--bg);
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  min-height: 58px;
  padding: 0 var(--pad);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter: blur(12px);
}

.brand {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
  text-decoration: none;
  text-transform: uppercase;
}

.site-header nav {
  display: flex;
  justify-content: center;
  gap: 22px;
  overflow: hidden;
}

.site-header nav a {
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
}

.site-header nav a:hover,
.site-header nav a:focus-visible { color: var(--accent); }

.theme-button {
  min-width: 50px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: transparent;
  cursor: pointer;
  font-size: 12px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(340px, .7fr);
  gap: clamp(40px, 7vw, 100px);
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(76px, 10vw, 136px) var(--pad) clamp(64px, 8vw, 104px);
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 840px;
  margin: 0;
  font-size: clamp(44px, 7vw, 92px);
  font-weight: 900;
  letter-spacing: -.055em;
  line-height: 1.02;
}

mark {
  padding: 0 .08em .04em;
  background: var(--accent);
  color: #fff;
}

.lede {
  max-width: 760px;
  margin: 30px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 1.6vw, 21px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: background-color .15s ease, border-color .15s ease, color .15s ease;
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.button:hover,
.button:focus-visible { border-color: var(--accent); }

.button.primary:hover,
.button.primary:focus-visible { background: var(--accent-deep); }

.verdict-sheet {
  align-self: end;
  padding: 0 0 0 26px;
  border-left: 4px solid var(--accent);
}

.sheet-label {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
}

.verdict-sheet dl { margin: 0; }

.verdict-sheet dl div {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  padding: 11px 0;
  border-bottom: 1px solid var(--soft-line);
}

.verdict-sheet dt { color: var(--muted); font-size: 13px; }
.verdict-sheet dd { margin: 0; font-weight: 800; white-space: nowrap; }
.verdict-sheet > p { margin: 18px 0 0; color: var(--muted); font-size: 13px; }

.audit-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.audit-strip article {
  min-width: 0;
  padding: 24px clamp(14px, 2.5vw, 36px);
  border-right: 1px solid var(--line);
}

.audit-strip article:last-child { border-right: 0; }
.audit-strip span,
.audit-strip small { display: block; color: var(--muted); font-size: 12px; }
.audit-strip strong { display: block; margin: 2px 0; font-size: clamp(23px, 3vw, 40px); line-height: 1.1; }

.warning-band {
  display: grid;
  grid-template-columns: minmax(180px, .35fr) minmax(0, 1.65fr);
  gap: 28px;
  max-width: var(--max);
  margin: clamp(44px, 7vw, 92px) auto 0;
  padding: 28px var(--pad);
  border-top: 3px solid var(--accent);
  border-bottom: 1px solid var(--line);
}

.warning-band strong { font-size: 20px; }
.warning-band p { margin: 0; color: var(--muted); }

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(80px, 11vw, 150px) var(--pad) 0;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, .65fr);
  column-gap: 64px;
  align-items: end;
  margin-bottom: 38px;
}

.section-head .eyebrow { grid-column: 1 / -1; }
.section-head h2 { margin: 0; font-size: clamp(32px, 5vw, 62px); letter-spacing: -.045em; line-height: 1.06; }
.section-head > p:last-child { margin: 0; color: var(--muted); }

.cup-ledger {
  display: grid;
  grid-template-columns: 220px 1fr 220px;
  gap: 0;
  border: 1px solid var(--line);
  background: var(--paper);
}

.ledger-total,
.ledger-result {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 28px;
}

.ledger-total { border-right: 1px solid var(--line); }
.ledger-result { border-left: 1px solid var(--line); }
.ledger-total span,
.ledger-result span { color: var(--muted); font-size: 12px; }
.ledger-total strong { margin: 8px 0; color: var(--accent); font-size: 50px; line-height: 1; }
.ledger-result strong { margin: 8px 0; font-size: 34px; }
.ledger-total small,
.ledger-result p { margin: 0; color: var(--muted); font-size: 11px; }

.ledger-lines > div {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  padding: 10px 16px 13px;
  border-bottom: 1px solid var(--soft-line);
  overflow: hidden;
  font-size: 13px;
}

.ledger-lines > div:last-child { border-bottom: 0; }
.ledger-lines b { color: var(--accent); }
.ledger-lines i {
  position: absolute;
  bottom: 0;
  left: 0;
  width: var(--share);
  height: 3px;
  background: var(--accent);
}
.ledger-lines .fixed i { background: var(--ink); }

.evidence-box {
  display: grid;
  grid-template-columns: .55fr 1fr;
  gap: 28px 52px;
  margin-top: 30px;
  padding: 30px;
  border-left: 4px solid var(--ink);
  background: var(--paper);
}

.evidence-box h3 { margin: 0; font-size: 22px; line-height: 1.25; }
.evidence-box p { margin: 0; }
.evidence-box .caveat { grid-column: 2; color: var(--muted); font-size: 13px; }

.scenario-table-wrap,
.cost-table-wrap,
.sales-table-wrap,
.owner-table-wrap,
.payback-table-wrap,
.stress-table-wrap { margin-top: 30px; overflow-x: auto; border: 1px solid var(--line); background: var(--paper); }

table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th,
td { padding: 13px 15px; border-bottom: 1px solid var(--soft-line); text-align: left; vertical-align: top; white-space: nowrap; }
thead th { background: color-mix(in srgb, var(--ink) 5%, var(--paper)); color: var(--muted); font-size: 11px; letter-spacing: .04em; }
tbody th { font-weight: 800; }
tbody td { font-size: 13px; }
tbody tr:last-child th,
tbody tr:last-child td { border-bottom: 0; }
tbody tr.focus { background: var(--accent-soft); }
tbody tr.total { background: color-mix(in srgb, var(--ink) 7%, var(--paper)); font-weight: 800; }
td.loss,
.loss { color: var(--bad); font-weight: 800; }
.sales-table-wrap tr.profit { background: var(--good-soft); }
.sales-table-wrap tr.near { background: var(--accent-soft); }
.stress-table-wrap tr.bad { background: var(--accent-soft); }
.stress-table-wrap tr.good { background: var(--good-soft); }

.product-costs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: 30px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.product-costs article { padding: 24px; border-right: 1px solid var(--line); }
.product-costs article:last-child { border-right: 0; }
.product-costs article > div { display: flex; justify-content: space-between; gap: 12px; }
.product-costs span { font-weight: 800; }
.product-costs strong { color: var(--accent); font-size: 13px; }
.product-costs p { margin: 12px 0 0; color: var(--muted); font-size: 13px; }

.finance-section {
  max-width: none;
  margin-top: clamp(80px, 11vw, 150px);
  padding: clamp(70px, 8vw, 110px) max(var(--pad), calc((100vw - var(--max)) / 2 + var(--pad)));
  background: var(--black);
  color: var(--bg);
}

html[data-theme="dark"] .finance-section { background: #ece5da; color: #171410; }
.finance-section .section-head > p:last-child { color: color-mix(in srgb, currentColor 65%, transparent); }
.finance-section .eyebrow { color: #ff7579; }

.preset-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.preset-row button {
  padding: 8px 12px;
  border: 1px solid color-mix(in srgb, currentColor 30%, transparent);
  border-radius: 2px;
  background: transparent;
  cursor: pointer;
  font-size: 13px;
}
.preset-row button.active { border-color: var(--accent); background: var(--accent); color: #fff; }

.calculator-grid { display: grid; grid-template-columns: minmax(320px, .75fr) minmax(0, 1.25fr); border: 1px solid color-mix(in srgb, currentColor 35%, transparent); }
.calc-form { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; padding: 28px; border-right: 1px solid color-mix(in srgb, currentColor 35%, transparent); }
.calc-form label { display: block; }
.calc-form label > span { display: block; margin-bottom: 6px; font-size: 12px; color: color-mix(in srgb, currentColor 70%, transparent); }
.calc-form label > div { display: grid; grid-template-columns: 1fr auto; align-items: center; border-bottom: 1px solid color-mix(in srgb, currentColor 35%, transparent); }
.calc-form input { min-width: 0; width: 100%; padding: 7px 0; border: 0; outline: 0; background: transparent; color: inherit; font-size: 25px; font-weight: 800; }
.calc-form i { font-style: normal; font-size: 11px; color: color-mix(in srgb, currentColor 65%, transparent); }
.calc-form small { display: block; margin-top: 5px; color: color-mix(in srgb, currentColor 55%, transparent); font-size: 10px; }
.calc-form button { align-self: end; }

.calc-output { padding: 28px; }
.main-result { display: flex; align-items: baseline; gap: 10px; padding-bottom: 24px; border-bottom: 1px solid color-mix(in srgb, currentColor 30%, transparent); }
.main-result span { font-size: 13px; }
.main-result strong { margin-left: auto; color: #ff686d; font-size: clamp(52px, 7vw, 92px); line-height: 1; letter-spacing: -.05em; }
.main-result i { font-style: normal; font-weight: 800; }
.main-result p { flex-basis: 100%; display: none; }
.output-grid { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 22px; }
.output-grid article { padding: 0 16px; border-right: 1px solid color-mix(in srgb, currentColor 25%, transparent); }
.output-grid article:first-child { padding-left: 0; }
.output-grid article:last-child { border-right: 0; }
.output-grid span,
.output-grid small { display: block; color: color-mix(in srgb, currentColor 62%, transparent); font-size: 11px; }
.output-grid strong { display: block; font-size: clamp(24px, 3vw, 38px); line-height: 1.2; }
.target-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 26px; }
.target-list div { padding: 12px; border: 1px solid color-mix(in srgb, currentColor 24%, transparent); }
.target-list span,
.target-list b { display: block; }
.target-list span { font-size: 11px; color: color-mix(in srgb, currentColor 62%, transparent); }
.target-list b { margin-top: 4px; font-size: 13px; }
.calc-note { margin: 22px 0 0; color: color-mix(in srgb, currentColor 68%, transparent); font-size: 13px; }

.margin-compare,
.store-model-grid,
.channel-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.margin-compare article { padding: 26px; border-right: 1px solid var(--line); }
.margin-compare article:last-child { border-right: 0; }
.margin-compare span { display: block; min-height: 48px; color: var(--muted); font-size: 12px; }
.margin-compare strong { display: block; color: var(--accent); font-size: clamp(36px, 5vw, 58px); line-height: 1; }
.margin-compare p { margin: 16px 0 0; color: var(--muted); font-size: 13px; }
.margin-compare .accent { background: var(--accent); color: #fff; }
.margin-compare .accent span,
.margin-compare .accent strong,
.margin-compare .accent p { color: #fff; }

.store-model-grid { grid-template-columns: repeat(3, 1fr); }
.store-model-grid > article { padding: 26px; border-right: 1px solid var(--line); }
.store-model-grid > article:last-child { border-right: 0; }
.store-model-grid > article.featured { background: var(--paper); box-shadow: inset 0 4px 0 var(--accent); }
.store-model-grid header { display: flex; gap: 14px; align-items: flex-start; }
.store-model-grid header > span { display: grid; place-items: center; width: 36px; height: 36px; border: 1px solid var(--accent); color: var(--accent); font-weight: 900; }
.store-model-grid h3 { margin: 0; font-size: 24px; }
.store-model-grid header p { margin: 0; color: var(--muted); font-size: 12px; }
.store-model-grid dl { margin: 24px 0; }
.store-model-grid dl div { display: flex; justify-content: space-between; gap: 18px; padding: 8px 0; border-bottom: 1px solid var(--soft-line); font-size: 13px; }
.store-model-grid dd { margin: 0; text-align: right; font-weight: 700; }
.store-model-grid > article > strong { display: block; color: var(--accent); font-size: 23px; }
.store-model-grid > article > p { color: var(--muted); font-size: 13px; }

.staff-note,
.peak-box,
.closure-note {
  margin-top: 30px;
  padding: 25px 28px;
  border-left: 4px solid var(--accent);
  background: var(--paper);
}
.staff-note h3,
.peak-box h3 { margin: 0 0 8px; }
.staff-note p,
.peak-box p,
.closure-note { color: var(--muted); }
.staff-note p,
.peak-box p { margin: 0; }

.cash-flow-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.official-costs,
.accounting-rules { padding: 28px; border: 1px solid var(--line); background: var(--paper); }
.official-costs h3,
.accounting-rules h3 { margin-top: 0; }
.official-costs dl { margin: 0; }
.official-costs dl div { display: flex; justify-content: space-between; gap: 20px; padding: 9px 0; border-bottom: 1px solid var(--soft-line); }
.official-costs dd { margin: 0; font-weight: 800; }
.official-costs .total { color: var(--accent); font-size: 19px; }
.official-costs > p { margin-bottom: 0; color: var(--muted); font-size: 12px; }
.accounting-rules ul { margin: 0; padding-left: 20px; }
.accounting-rules li { margin-bottom: 13px; }
.cash-estimate { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 28px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.cash-estimate article { padding: 22px; border-right: 1px solid var(--line); }
.cash-estimate article:last-child { border-right: 0; }
.cash-estimate span,
.cash-estimate strong { display: block; }
.cash-estimate span { color: var(--muted); font-size: 12px; }
.cash-estimate strong { margin: 6px 0; color: var(--accent); font-size: 24px; }
.cash-estimate p { margin: 0; color: var(--muted); font-size: 12px; }

.channel-grid { grid-template-columns: repeat(3, 1fr); }
.channel-grid article { padding: 28px; border-right: 1px solid var(--line); }
.channel-grid article:last-child { border-right: 0; }
.channel-grid .featured { background: var(--paper); box-shadow: inset 0 4px 0 var(--accent); }
.channel-grid > article > span { display: block; color: var(--muted); font-size: 12px; }
.channel-grid > article > strong { display: block; margin: 10px 0 20px; color: var(--accent); font-size: 25px; }
.channel-grid dl { display: grid; grid-template-columns: repeat(2, 1fr); margin: 0; }
.channel-grid dl div { padding: 10px; border: 1px solid var(--soft-line); }
.channel-grid dt { color: var(--muted); font-size: 11px; }
.channel-grid dd { margin: 0; font-weight: 800; }
.channel-grid p,
.source-note,
.table-definition { color: var(--muted); font-size: 12px; }

.speed-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.speed-grid article { padding: 28px; border-right: 1px solid var(--line); }
.speed-grid article:last-child { border-right: 0; }
.speed-grid span { color: var(--muted); font-size: 12px; }
.speed-grid strong { display: block; margin-top: 4px; color: var(--accent); font-size: clamp(25px, 4vw, 42px); }
.speed-grid p { margin: 7px 0 0; color: var(--muted); }

.sales-evidence { display: grid; grid-template-columns: .8fr 1.2fr; gap: 30px; }
.national-anchor { padding: 30px; background: var(--accent); color: #fff; }
.national-anchor span,
.national-anchor strong,
.national-anchor small { display: block; }
.national-anchor span { font-size: 12px; }
.national-anchor strong { margin: 8px 0 20px; font-size: clamp(40px, 6vw, 68px); line-height: 1; letter-spacing: -.04em; }
.national-anchor p { font-weight: 700; }
.national-anchor small { opacity: .78; }
.evidence-list article { display: grid; grid-template-columns: 38px 1fr; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.evidence-list article:first-child { padding-top: 0; }
.evidence-list article > b { display: grid; place-items: center; width: 34px; height: 34px; border: 1px solid var(--line); color: var(--accent); }
.evidence-list h3 { margin: 0; font-size: 16px; }
.evidence-list p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.sales-grade { display: grid; grid-template-columns: repeat(6, 1fr); margin-top: 30px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sales-grade div { padding: 18px; border-right: 1px solid var(--line); }
.sales-grade div:last-child { border-right: 0; }
.sales-grade span,
.sales-grade b,
.sales-grade small { display: block; }
.sales-grade span { color: var(--accent); font-weight: 800; }
.sales-grade b { margin: 6px 0; }
.sales-grade small { color: var(--muted); }

.risk-factors { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 28px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.risk-factors article { padding: 20px; border-right: 1px solid var(--line); }
.risk-factors article:last-child { border-right: 0; }
.risk-factors b { color: var(--accent); }
.risk-factors p { margin: 8px 0 0; color: var(--muted); font-size: 12px; }

.decision-lead { display: grid; grid-template-columns: .55fr 1fr; gap: 40px; padding: 30px; border: 1px solid var(--line); background: var(--paper); }
.decision-lead > p { margin: 0; font-size: 21px; font-weight: 800; }
.decision-lead ol { margin: 0; padding-left: 20px; }
.decision-lead li { margin-bottom: 10px; }
.decision-grid { display: grid; grid-template-columns: repeat(2, 1fr); margin-top: 28px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.decision-grid article { padding: 28px; }
.decision-grid article:first-child { border-right: 1px solid var(--line); }
.decision-grid span { color: var(--muted); font-size: 12px; }
.decision-grid strong { display: block; margin: 6px 0; font-size: 30px; }
.decision-grid .go strong { color: var(--good); }
.decision-grid .stop strong { color: var(--bad); }
.decision-grid p { margin: 0; color: var(--muted); }
.final-answers { margin-top: 34px; }
.final-answers h3 { font-size: 24px; }
.final-answers dl { margin: 0; border-top: 1px solid var(--line); }
.final-answers dl div { display: grid; grid-template-columns: minmax(220px, .4fr) 1fr; gap: 24px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.final-answers dt { color: var(--muted); }
.final-answers dd { margin: 0; }

.method-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.method-grid article { padding: 24px; border-right: 1px solid var(--line); }
.method-grid article:last-child { border-right: 0; }
.method-grid b { display: grid; place-items: center; width: 34px; height: 34px; border: 1px solid var(--accent); color: var(--accent); }
.method-grid h3 { margin: 12px 0 4px; }
.method-grid p,
.methodology > p { color: var(--muted); font-size: 13px; }

.sources ol { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); counter-reset: source; }
.sources li { position: relative; display: grid; grid-template-columns: minmax(260px, .65fr) auto 1fr; gap: 18px 30px; padding: 18px 0 18px 42px; border-bottom: 1px solid var(--line); counter-increment: source; }
.sources li::before { content: counter(source, decimal-leading-zero); position: absolute; left: 0; top: 19px; color: var(--accent); font-size: 12px; font-weight: 800; }
.sources li a { font-weight: 800; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.sources li span { color: var(--accent); font-size: 11px; font-weight: 800; white-space: nowrap; }
.sources li p { margin: 0; color: var(--muted); font-size: 12px; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  max-width: var(--max);
  margin: clamp(90px, 12vw, 160px) auto 0;
  padding: 30px var(--pad);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}

footer p { margin: 0; text-align: center; }

@media (max-width: 980px) {
  .site-header nav { justify-content: flex-start; overflow-x: auto; }
  .hero { grid-template-columns: 1fr; }
  .verdict-sheet { max-width: 640px; }
  .audit-strip { grid-template-columns: repeat(3, 1fr); }
  .audit-strip article:nth-child(3) { border-right: 0; }
  .audit-strip article:nth-child(n+4) { border-top: 1px solid var(--line); }
  .section-head { grid-template-columns: 1fr; gap: 18px; }
  .cup-ledger { grid-template-columns: 170px 1fr; }
  .ledger-result { grid-column: 1 / -1; border-top: 1px solid var(--line); border-left: 0; }
  .calculator-grid { grid-template-columns: 1fr; }
  .calc-form { border-right: 0; border-bottom: 1px solid color-mix(in srgb, currentColor 35%, transparent); }
  .margin-compare { grid-template-columns: repeat(2, 1fr); }
  .margin-compare article:nth-child(2) { border-right: 0; }
  .margin-compare article:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .sales-grade { grid-template-columns: repeat(3, 1fr); }
  .sales-grade div:nth-child(3) { border-right: 0; }
  .sales-grade div:nth-child(-n+3) { border-bottom: 1px solid var(--line); }
  .risk-factors { grid-template-columns: repeat(2, 1fr); }
  .risk-factors article:nth-child(2) { border-right: 0; }
  .risk-factors article:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .sources li { grid-template-columns: 1fr auto; }
  .sources li p { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  :root { --pad: 18px; }
  .site-header { grid-template-columns: 1fr auto; gap: 10px; }
  .site-header nav { grid-column: 1 / -1; grid-row: 2; padding-bottom: 8px; gap: 18px; }
  .hero { padding-top: 58px; }
  .hero h1 { font-size: clamp(42px, 13vw, 66px); }
  .audit-strip { grid-template-columns: repeat(2, 1fr); }
  .audit-strip article { border-top: 1px solid var(--line); }
  .audit-strip article:nth-child(odd) { border-right: 1px solid var(--line); }
  .audit-strip article:nth-child(even) { border-right: 0; }
  .audit-strip article:first-child,
  .audit-strip article:nth-child(2) { border-top: 0; }
  .warning-band { grid-template-columns: 1fr; }
  .cup-ledger { grid-template-columns: 1fr; }
  .ledger-total { border-right: 0; border-bottom: 1px solid var(--line); }
  .evidence-box { grid-template-columns: 1fr; }
  .evidence-box .caveat { grid-column: auto; }
  .product-costs,
  .store-model-grid,
  .cash-estimate,
  .channel-grid,
  .speed-grid,
  .method-grid { grid-template-columns: 1fr; }
  .product-costs article,
  .store-model-grid > article,
  .cash-estimate article,
  .channel-grid article,
  .speed-grid article,
  .method-grid article { border-right: 0; border-bottom: 1px solid var(--line); }
  .product-costs article:last-child,
  .store-model-grid > article:last-child,
  .cash-estimate article:last-child,
  .channel-grid article:last-child,
  .speed-grid article:last-child,
  .method-grid article:last-child { border-bottom: 0; }
  .calc-form { grid-template-columns: 1fr; padding: 20px; }
  .main-result { flex-wrap: wrap; }
  .main-result strong { margin-left: 0; }
  .output-grid,
  .target-list { grid-template-columns: repeat(2, 1fr); }
  .output-grid article:nth-child(2) { border-right: 0; }
  .output-grid article:nth-child(n+3) { margin-top: 18px; }
  .margin-compare { grid-template-columns: 1fr; }
  .margin-compare article { border-right: 0; border-bottom: 1px solid var(--line); }
  .cash-flow-grid,
  .sales-evidence,
  .decision-lead,
  .decision-grid { grid-template-columns: 1fr; }
  .decision-grid article:first-child { border-right: 0; border-bottom: 1px solid var(--line); }
  .sales-grade { grid-template-columns: repeat(2, 1fr); }
  .sales-grade div:nth-child(odd) { border-right: 1px solid var(--line); }
  .sales-grade div:nth-child(even) { border-right: 0; }
  .sales-grade div:nth-child(-n+4) { border-bottom: 1px solid var(--line); }
  .risk-factors { grid-template-columns: 1fr; }
  .risk-factors article { border-right: 0; border-bottom: 1px solid var(--line); }
  .risk-factors article:last-child { border-bottom: 0; }
  .final-answers dl div { grid-template-columns: 1fr; gap: 6px; }
  .sources li { grid-template-columns: 1fr; padding-left: 36px; }
  .sources li p { grid-column: auto; }
  footer { flex-direction: column; align-items: flex-start; }
  footer p { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}