/* B1 公共叙事底座：沿用入口与 M1 的网格、尺度和状态语言。 */
:root {
  --bg: oklch(98% 0.005 250);
  --surface: oklch(100% 0 0);
  --fg: oklch(22% 0.02 240);
  --muted: oklch(50% 0.018 240);
  --border: oklch(90% 0.008 240);
  --accent: oklch(58% 0.16 145);
  --accent-dark: oklch(45% 0.13 145);
  --accent-bg: oklch(96% 0.03 145);
  --warn: oklch(54% 0.11 77);
  --warn-bg: oklch(96% 0.035 80);
  --info: oklch(46% 0.12 245);
  --info-bg: oklch(96% 0.025 245);
  --danger: oklch(48% 0.17 28);
  --danger-bg: oklch(96% 0.035 28);
  --dark: oklch(19% 0.025 240);
  --dark-surface: oklch(24% 0.024 240);
  --dark-muted: oklch(76% 0.012 240);
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--fg);
  background-color: var(--bg);
  background-image:
    linear-gradient(to right, color-mix(in oklch, var(--border) 42%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in oklch, var(--border) 42%, transparent) 1px, transparent 1px);
  background-size: 32px 32px;
  font: 16px/1.75 var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

[hidden] { display: none !important; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
a { color: inherit; }
a:focus-visible, button:focus-visible, [tabindex]:focus-visible { outline: 3px solid var(--fg); outline-offset: 3px; }
code { font-family: var(--font-mono); overflow-wrap: anywhere; }
.frame { width: min(1240px, calc(100% - 64px)); margin-inline: auto; }
section[id] { scroll-margin-top: 92px; }

.progress { position: fixed; inset: 0 0 auto; z-index: 100; height: 3px; }
.progress span { display: block; width: 0; height: 100%; background: var(--accent); }

/* Header */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 72px;
  display: grid;
  grid-template-columns: minmax(235px, 1fr) auto minmax(235px, 1fr);
  align-items: center;
  gap: 28px;
  padding: 0 max(32px, calc((100vw - 1240px) / 2));
  background: color-mix(in oklch, var(--surface) 92%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(18px);
}
.brand { min-height: 44px; display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font: 600 14px/1 var(--font-mono); letter-spacing: .06em; }
.brand b { margin-left: 6px; color: var(--muted); font-weight: 500; }
.mobile-home { display: none; color: var(--muted); font-size: 11px; letter-spacing: 0; }
.mark { width: 22px; height: 22px; display: grid; grid-template-columns: 1fr 1fr; gap: 3px; transform: rotate(45deg); }
.mark i { background: var(--fg); }
.mark i:nth-child(2) { background: var(--accent); }
.nav { display: flex; gap: 24px; font-size: 14px; font-weight: 550; white-space: nowrap; }
.nav a { padding: 12px 0; text-decoration: none; border-bottom: 1px solid transparent; }
.nav a:hover { border-color: var(--fg); }
.nav .tour-home { color: var(--accent-dark); }
.mobile-nav { display: none; }
.stage-tag { justify-self: end; min-height: 40px; display: inline-flex; align-items: center; padding: 0 13px; color: var(--warn); background: var(--warn-bg); border: 1px solid currentColor; border-radius: 4px; font: 600 11px/1.3 var(--font-mono); white-space: nowrap; }

/* Shared headings */
.eyebrow, .kicker { margin: 0 0 18px; color: var(--muted); font: 550 12px/1.4 var(--font-mono); letter-spacing: .09em; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 48px; margin-bottom: 46px; }
.section-head h2 { margin: 0; max-width: 18ch; font: 600 clamp(34px, 4vw, 52px)/1.35 var(--font-sans); letter-spacing: -.02em; }
.section-head > p { width: min(480px, 42%); margin: 0; color: var(--muted); }
.content { padding-block: 124px; }

/* Hero */
.hero { min-height: 700px; display: grid; grid-template-columns: 1.05fr .95fr; gap: 8%; align-items: center; padding-block: 94px; }
.hero h1 { margin: 0; max-width: 760px; font: 600 clamp(50px, 5.5vw, 78px)/1.3 var(--font-sans); letter-spacing: -.03em; }
.lead { max-width: 62ch; margin: 28px 0 0; color: var(--muted); font-size: 18px; line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.hero-actions a { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; padding: 0 18px; background: var(--surface); border: 1px solid var(--fg); border-radius: 4px; font-weight: 650; text-decoration: none; }
.hero-actions .primary { min-width: 206px; justify-content: space-between; gap: 28px; color: var(--surface); background: var(--fg); }
.hero-actions a:hover { color: var(--surface); background: var(--accent-dark); border-color: var(--accent-dark); }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); margin: 32px 0 0; background: var(--surface); border: 1px solid var(--border); }
.hero-facts div { min-height: 92px; display: flex; flex-direction: column; justify-content: center; padding: 16px 18px; border-right: 1px solid var(--border); }
.hero-facts div:last-child { border-right: 0; }
.hero-facts dt { color: var(--muted); font: 11px/1.4 var(--font-mono); }
.hero-facts dd { margin: 7px 0 0; font-size: 14px; font-weight: 650; }
.hero-facts strong { margin-right: 3px; font: 600 24px/1 var(--font-mono); }

.foundation-map { position: relative; padding: 28px; background: var(--surface); border: 1px solid var(--border); box-shadow: 0 28px 90px color-mix(in oklch, var(--fg) 9%, transparent); }
.foundation-map::before { content: "COMMON FOUNDATION"; position: absolute; top: -27px; right: 0; color: var(--muted); font: 11px/1 var(--font-mono); letter-spacing: .12em; }
.map-head { min-height: 86px; display: flex; flex-direction: column; justify-content: center; padding: 18px 22px; color: var(--surface); background: var(--dark); }
.map-head span, .common-layer > p, .optional-label, .map-note { font: 11px/1.4 var(--font-mono); letter-spacing: .06em; }
.map-head span { color: var(--dark-muted); }
.map-head b { margin-top: 7px; font-size: 20px; }
.map-line { height: 36px; display: grid; place-items: center; }
.map-line span { width: 1px; height: 100%; background: var(--border); }
.common-layer { padding: 20px; background: var(--accent-bg); border: 1px solid var(--accent); }
.common-layer > p { margin: 0 0 14px; color: var(--accent-dark); }
.common-grid { display: grid; grid-template-columns: 1fr 1fr; background: var(--surface); border: 1px solid var(--border); }
.common-grid span { min-height: 58px; display: flex; align-items: center; gap: 9px; padding: 10px 12px; border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); font-size: 13px; font-weight: 650; }
.common-grid span:nth-child(even) { border-right: 0; }
.common-grid span:nth-child(n + 3) { border-bottom: 0; }
.common-grid i { color: var(--muted); font: normal 10px/1 var(--font-mono); }
.optional-label { position: relative; height: 48px; display: grid; place-items: center; color: var(--muted); }
.optional-label::before { content: ""; position: absolute; inset: 50% 0 auto; border-top: 1px solid var(--border); }
.optional-label span { z-index: 1; padding: 0 10px; background: var(--surface); }
.optional-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--border); }
.optional-grid div { min-height: 90px; display: flex; flex-direction: column; justify-content: center; padding: 14px; border-right: 1px solid var(--border); }
.optional-grid div:last-child { border-right: 0; }
.optional-grid b { font-size: 14px; }
.optional-grid small { margin-top: 4px; color: var(--muted); font-size: 11px; }
.map-note { margin: 18px 0 0; color: var(--muted); }
.map-note b { color: var(--fg); }

/* Before / after */
.position { display: grid; grid-template-columns: .78fr 1.22fr; gap: 66px; align-items: start; padding: 54px; background: var(--surface); border: 1px solid var(--border); box-shadow: 0 18px 60px color-mix(in oklch, var(--fg) 5%, transparent); }
.position h2 { margin: 0; max-width: 15ch; font: 600 clamp(28px, 3vw, 38px)/1.42 var(--font-sans); }
.before-after { display: grid; grid-template-columns: 1fr 38px 1fr; align-items: stretch; }
.before-after article { min-height: 260px; display: flex; flex-direction: column; padding: 28px; border: 1px solid var(--border); }
.before-after article > span { color: var(--muted); font: 11px/1.4 var(--font-mono); letter-spacing: .08em; }
.before-after h3 { margin: 48px 0 12px; font: 600 22px/1.45 var(--font-sans); }
.before-after p { margin: auto 0 0; color: var(--muted); font-size: 14px; }
.after-card { background: var(--accent-bg); border-color: var(--accent) !important; }
.after-card > span { color: var(--accent-dark) !important; }
.change-mark { display: grid; place-items: center; color: var(--muted); font: 18px/1 var(--font-mono); }

/* Contract workbench */
.contract-workbench { display: grid; grid-template-columns: 310px minmax(0, 1fr); min-height: 620px; background: var(--surface); border: 1px solid var(--border); }
.contract-tabs { display: grid; grid-template-rows: repeat(4, 1fr); border-right: 1px solid var(--border); }
.contract-tabs button { min-height: 132px; display: grid; grid-template-columns: 34px 1fr 18px; gap: 13px; align-items: center; padding: 20px; text-align: left; color: var(--fg); background: var(--surface); border: 0; border-bottom: 1px solid var(--border); cursor: pointer; }
.contract-tabs button:last-child { border-bottom: 0; }
.contract-tabs button:hover, .contract-tabs button.active { color: var(--surface); background: var(--dark); }
.contract-tabs small { color: var(--muted); font: 11px/1 var(--font-mono); }
.contract-tabs span { color: var(--muted); font-size: 13px; }
.contract-tabs b { display: block; margin-bottom: 5px; color: var(--fg); font-size: 17px; }
.contract-tabs button:hover b, .contract-tabs button.active b { color: var(--surface); }
.contract-tabs button:hover span, .contract-tabs button.active span { color: var(--dark-muted); }
.contract-tabs i { font-style: normal; }
.contract-panels { min-width: 0; }
.contract-panel { min-height: 620px; padding: 48px 50px; }
.contract-panel > header { display: flex; justify-content: space-between; gap: 24px; padding-bottom: 28px; border-bottom: 1px solid var(--border); }
.contract-panel header p { margin: 0 0 10px; color: var(--muted); font: 12px/1.4 var(--font-mono); }
.contract-panel h3 { margin: 0; max-width: 30ch; font: 600 clamp(27px, 3vw, 36px)/1.38 var(--font-sans); }
.badge { flex: none; width: fit-content; height: fit-content; min-height: 28px; display: inline-flex; align-items: center; padding: 3px 9px; border: 1px solid currentColor; border-radius: 999px; font: 550 11px/1.4 var(--font-mono); }
.determined { color: var(--info); background: var(--info-bg); }
.contract-summary { max-width: 66ch; margin: 26px 0; color: var(--muted); font-size: 17px; }
.promise-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--border); border-left: 1px solid var(--border); }
.promise-grid > div { min-height: 185px; display: flex; flex-direction: column; padding: 20px; border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.promise-grid span { color: var(--muted); font: 11px/1.4 var(--font-mono); letter-spacing: .05em; }
.promise-grid b { margin-top: 34px; font-size: 17px; line-height: 1.45; }
.promise-grid p { margin: auto 0 0; color: var(--muted); font-size: 13px; }
.plain-example { display: grid; grid-template-columns: 116px 1fr; gap: 24px; align-items: center; margin-top: 20px; padding: 20px 22px; color: var(--surface); background: var(--fg); }
.plain-example span { color: var(--dark-muted); font: 11px/1.4 var(--font-mono); letter-spacing: .07em; }
.plain-example p { margin: 0; }
.authority-note { margin: 20px 0 0; padding-left: 14px; color: var(--muted); border-left: 3px solid var(--border); font-size: 13px; }

/* Wire */
.wire { padding-block: 120px; color: var(--surface); background: var(--dark); }
.wire .kicker, .dark-head > p { color: var(--dark-muted); }
.wire-flow { display: grid; grid-template-columns: 1fr 34px 1fr 34px 1fr 34px 1fr; align-items: stretch; }
.wire-flow article { min-height: 250px; display: flex; flex-direction: column; padding: 26px; background: var(--dark-surface); border: 1px solid color-mix(in oklch, var(--surface) 15%, transparent); }
.wire-flow article:nth-of-type(2) { color: var(--fg); background: var(--surface); }
.wire-flow article:nth-of-type(2) span, .wire-flow article:nth-of-type(2) p { color: var(--muted); }
.wire-flow span { color: var(--dark-muted); font: 11px/1.4 var(--font-mono); }
.wire-flow b { margin-top: 54px; font-size: 21px; }
.wire-flow p { margin: 7px 0 0; color: var(--dark-muted); font-size: 13px; }
.wire-flow code { width: fit-content; margin-top: auto; padding: 5px 7px; color: var(--dark-muted); border: 1px solid color-mix(in oklch, var(--surface) 16%, transparent); font-size: 11px; }
.wire-flow article:nth-of-type(2) code { color: var(--muted); border-color: var(--border); }
.wire-flow > i { display: grid; place-items: center; color: var(--dark-muted); font-style: normal; }
.wire-split { display: grid; grid-template-columns: 1fr 1fr; margin-top: 36px; border-top: 1px solid color-mix(in oklch, var(--surface) 16%, transparent); }
.wire-split > div { display: grid; grid-template-columns: 150px 1fr; gap: 24px; padding: 28px 30px 0 0; }
.wire-split > div + div { padding-left: 30px; border-left: 1px solid color-mix(in oklch, var(--surface) 16%, transparent); }
.wire-split span { color: var(--surface); font-weight: 650; }
.wire-split p { margin: 0; color: var(--dark-muted); }

/* Status */
.status-grid { display: grid; grid-template-columns: repeat(4, 1fr); background: var(--surface); border: 1px solid var(--border); }
.status-grid article { min-height: 330px; display: flex; flex-direction: column; padding: 28px; border-right: 1px solid var(--border); }
.status-grid article:last-child { border-right: 0; }
.status-grid span { width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid currentColor; border-radius: 50%; font: 11px/1 var(--font-mono); }
.status-grid [data-tone="determined"] span { color: var(--info); background: var(--info-bg); }
.status-grid [data-tone="verified"] span { color: var(--accent-dark); background: var(--accent-bg); }
.status-grid [data-tone="unknown"] span { color: var(--warn); background: var(--warn-bg); }
.status-grid [data-tone="pending"] span { color: var(--danger); background: var(--danger-bg); }
.status-grid h3 { margin: 46px 0 12px; font: 600 23px/1.4 var(--font-sans); }
.status-grid p { margin: 0; color: var(--muted); }
.status-grid b { margin-top: auto; padding-top: 22px; border-top: 1px solid var(--border); font: 550 11px/1.5 var(--font-mono); }

/* Evidence and remaining work */
.carrier-pair { display: grid; grid-template-columns: 1fr 120px 1fr; align-items: stretch; background: var(--surface); border: 1px solid var(--border); }
.carrier-pair article { min-height: 350px; display: flex; flex-direction: column; padding: 38px; }
.carrier-pair article:first-child { border-right: 1px solid var(--border); }
.carrier-pair article:last-child { border-left: 1px solid var(--border); }
.carrier-pair article > span { color: var(--muted); font: 11px/1.4 var(--font-mono); letter-spacing: .08em; }
.carrier-pair h3 { max-width: 15ch; margin: 58px 0 12px; font: 600 27px/1.4 var(--font-sans); }
.carrier-pair p { margin: 0; color: var(--muted); }
.carrier-pair article > b { margin-top: auto; padding-top: 24px; border-top: 1px solid var(--border); font-size: 13px; }
.pair-mark { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 16px; }
.pair-mark i { width: 1px; height: 58px; background: var(--border); }
.pair-mark span { width: 56px; height: 56px; display: grid; place-items: center; color: var(--surface); background: var(--accent-dark); border-radius: 50%; font: 600 10px/1 var(--font-mono); }
.open-work { display: grid; grid-template-columns: .78fr 1.22fr; gap: 70px; margin-top: 84px; padding-top: 84px; border-top: 1px solid var(--border); }
.open-intro h2 { margin: 0; max-width: 13ch; font: 600 clamp(32px, 4vw, 48px)/1.38 var(--font-sans); }
.open-intro > p:last-child { max-width: 42ch; color: var(--muted); }
.open-work ol { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--border); }
.open-work li { min-height: 118px; display: grid; grid-template-columns: 54px 1fr; gap: 18px; align-items: center; padding: 20px 4px; border-bottom: 1px solid var(--border); }
.open-work li > span { color: var(--muted); font: 11px/1 var(--font-mono); }
.open-work b { font-size: 18px; }
.open-work li p { margin: 5px 0 0; color: var(--muted); }
.closing-note { display: grid; grid-template-columns: 210px 1fr; gap: 34px; align-items: center; margin-top: 56px; padding: 34px 38px; color: var(--surface); background: var(--fg); }
.closing-note > span { color: var(--dark-muted); font: 11px/1.4 var(--font-mono); letter-spacing: .08em; }
.closing-note p { margin: 0; font-size: 19px; }

/* Footer */
footer { min-height: 120px; display: flex; align-items: center; justify-content: space-between; gap: 32px; border-top: 1px solid var(--border); }
footer p { margin: 7px 0 0; color: var(--muted); font-size: 13px; }
footer > div:last-child { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px 22px; color: var(--muted); font: 12px/1.5 var(--font-mono); }
footer a { text-underline-offset: 4px; }

@media (max-width: 1100px) {
  .topbar { grid-template-columns: 1fr auto auto; }
  .nav { display: none; }
  .mobile-nav { position: relative; display: block; justify-self: end; }
  .mobile-nav summary { min-width: 54px; min-height: 40px; display: grid; place-items: center; background: var(--surface); border: 1px solid var(--border); border-radius: 4px; font: 600 11px/1 var(--font-mono); cursor: pointer; list-style: none; }
  .mobile-nav summary::-webkit-details-marker { display: none; }
  .mobile-nav[open] summary { color: var(--surface); background: var(--fg); border-color: var(--fg); }
  .mobile-nav > div { position: absolute; top: 48px; right: 0; width: 190px; display: grid; padding: 8px; background: var(--surface); border: 1px solid var(--border); box-shadow: 0 18px 50px color-mix(in oklch, var(--fg) 14%, transparent); }
  .mobile-nav a { min-height: 42px; display: flex; align-items: center; padding: 0 12px; text-decoration: none; border-bottom: 1px solid var(--border); font-size: 13px; }
  .mobile-nav a:last-child { border-bottom: 0; }
  .mobile-nav a:hover { background: var(--bg); }
  .hero { grid-template-columns: 1fr; gap: 82px; }
  .foundation-map { width: min(720px, 100%); }
  .position { grid-template-columns: 1fr; gap: 40px; }
  .position h2 { max-width: 22ch; }
  .contract-workbench { grid-template-columns: 1fr; }
  .contract-tabs { grid-template-columns: repeat(4, 1fr); grid-template-rows: auto; border-right: 0; border-bottom: 1px solid var(--border); }
  .contract-tabs button { min-height: 112px; grid-template-columns: 1fr; gap: 6px; border-right: 1px solid var(--border); border-bottom: 0; }
  .contract-tabs button:last-child { border-right: 0; }
  .contract-tabs button > i { display: none; }
  .contract-panel { min-height: 0; }
  .wire-flow { grid-template-columns: 1fr; gap: 10px; }
  .wire-flow > i { min-height: 22px; transform: rotate(90deg); }
  .wire-flow article { min-height: 190px; }
  .wire-flow b { margin-top: 34px; }
  .status-grid { grid-template-columns: 1fr 1fr; }
  .status-grid article { border-bottom: 1px solid var(--border); }
  .status-grid article:nth-child(even) { border-right: 0; }
  .status-grid article:nth-child(n + 3) { border-bottom: 0; }
}

@media (max-width: 720px) {
  body { font-size: 15px; }
  .frame { width: calc(100% - 28px); }
  section[id] { scroll-margin-top: 76px; }
  .topbar { height: 64px; padding-inline: 14px; }
  .topbar { grid-template-columns: 1fr auto; }
  .brand b { display: none; }
  .mobile-home { display: inline; }
  .stage-tag { display: none; }
  .hero { min-height: auto; padding-block: 76px; gap: 68px; }
  .hero h1 { font-size: clamp(44px, 13vw, 60px); line-height: 1.28; }
  .lead { font-size: 16px; }
  .hero-facts { grid-template-columns: 1fr; }
  .hero-facts div { min-height: 78px; border-right: 0; border-bottom: 1px solid var(--border); }
  .hero-facts div:last-child { border-bottom: 0; }
  .foundation-map { padding: 18px; }
  .common-grid, .optional-grid { grid-template-columns: 1fr; }
  .common-grid span, .optional-grid div { min-height: 54px; border-right: 0; border-bottom: 1px solid var(--border); }
  .common-grid span:last-child, .optional-grid div:last-child { border-bottom: 0; }
  .position { padding: 30px 22px; }
  .before-after { grid-template-columns: 1fr; }
  .change-mark { min-height: 42px; transform: rotate(90deg); }
  .before-after article { min-height: 230px; padding: 24px; }
  .content, .wire { padding-block: 82px; }
  .section-head { align-items: start; flex-direction: column; gap: 16px; margin-bottom: 32px; }
  .section-head h2 { font-size: 35px; }
  .section-head > p { width: 100%; }
  .contract-tabs { grid-template-columns: 1fr 1fr; }
  .contract-tabs button { min-height: 86px; padding: 13px; }
  .contract-tabs b { font-size: 14px; }
  .contract-tabs span { font-size: 11px; }
  .contract-panel { padding: 30px 22px; }
  .contract-panel > header { flex-direction: column-reverse; }
  .contract-panel h3 { font-size: 27px; }
  .contract-summary { font-size: 15px; }
  .promise-grid { grid-template-columns: 1fr; }
  .promise-grid > div { min-height: 150px; }
  .promise-grid b { margin-top: 22px; }
  .plain-example { grid-template-columns: 1fr; gap: 8px; }
  .wire { padding-inline: 0; }
  .wire-flow article { min-height: 170px; }
  .wire-split { grid-template-columns: 1fr; }
  .wire-split > div { grid-template-columns: 1fr; gap: 8px; padding: 24px 0; }
  .wire-split > div + div { padding-left: 0; border-top: 1px solid color-mix(in oklch, var(--surface) 16%, transparent); border-left: 0; }
  .status-grid { grid-template-columns: 1fr; }
  .status-grid article, .status-grid article:nth-child(even), .status-grid article:nth-child(n + 3) { min-height: 260px; border-right: 0; border-bottom: 1px solid var(--border); }
  .status-grid article:last-child { border-bottom: 0; }
  .carrier-pair { grid-template-columns: 1fr; }
  .carrier-pair article { min-height: 300px; padding: 28px 24px; }
  .carrier-pair article:first-child, .carrier-pair article:last-child { border: 0; }
  .carrier-pair article:first-child { border-bottom: 1px solid var(--border); }
  .carrier-pair article:last-child { border-top: 1px solid var(--border); }
  .pair-mark { min-height: 82px; flex-direction: row; }
  .pair-mark i { width: 58px; height: 1px; }
  .pair-mark span { width: 48px; height: 48px; }
  .open-work { grid-template-columns: 1fr; gap: 34px; margin-top: 68px; padding-top: 68px; }
  .open-intro h2 { font-size: 34px; }
  .closing-note { grid-template-columns: 1fr; gap: 10px; padding: 28px 24px; }
  .closing-note p { font-size: 17px; }
  footer { align-items: flex-start; flex-direction: column; justify-content: center; padding-block: 34px; }
  footer > div:last-child { align-items: flex-start; flex-direction: column; justify-content: flex-start; }
}

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