:root {
  --ink: #17191b;
  --muted: #687176;
  --line: #d9ddda;
  --paper: #f4f4f1;
  --white: #fbfbf8;
  --tint: #e8eeee;
  --accent: #b8d9d4;
  --teal: #1c5f5b;
  --motion-ease: cubic-bezier(.2, .74, .22, 1);
  --max: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: auto; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { letter-spacing: 0; }
.shell { width: min(calc(100% - 64px), var(--max)); margin: 0 auto; }
.site-header, .site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.site-header { width: min(calc(100% - 64px), 1360px); margin: 0 auto; }
.site-header a { text-decoration: none; }
.back-link { display: inline-flex; align-items: center; min-height: 44px; color: var(--muted); }
.header-meta { display: flex; gap: 22px; color: var(--muted); }
.header-mark { color: var(--muted); }
.hero { padding: 104px 0 82px; }
.hero-copy { max-width: 1100px; }
.eyebrow, .section-label, .section-number, .small-label { letter-spacing: .12em; text-transform: uppercase; }
.eyebrow { margin-bottom: 36px; color: #59706f; font-size: 11px; font-weight: 650; }
h1 { max-width: 1080px; margin-bottom: 30px; font-size: clamp(54px, 6vw, 78px); line-height: 1.03; font-weight: 650; }
.hero-deck { max-width: 650px; margin-bottom: 0; padding-left: 1em; font-size: 21px; line-height: 1.45; }
.hero-meta { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 28px; max-width: 900px; margin-top: 42px; color: var(--muted); }
.hero-meta span { padding-top: 12px; border-top: 1px solid var(--line); font-size: 12px; }
.hero-meta span { color: #59706f; font-size: 12px; letter-spacing: .06em; }
.hero-art-shell { min-width: 0; margin-top: 62px; }
.hero-art { display: block; width: 100%; height: 690px; border: 0; background: #edf3f6; }
.section { padding: 126px 0; border-top: 1px solid var(--line); }
.split-section { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 54px; }
.section-label { display: flex; flex-direction: column; gap: 10px; color: var(--muted); font-size: 11px; }
.section-number { color: #59706f; }
.section-content { min-width: 0; }
h2 { max-width: 820px; margin-bottom: 28px; font-size: clamp(42px, 5vw, 62px); line-height: 1.04; font-weight: 650; }
.section-lead { max-width: 700px; margin-bottom: 0; color: var(--muted); font-size: 19px; line-height: 1.5; }
.overview-section { padding-bottom: 142px; }
.overview-section .section-intro { padding-bottom: 72px; }
.system-field-rail { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.system-field-rail article { min-height: 170px; padding: 17px 22px 12px 0; border-top: 1px solid #b9c4c1; }
.system-field-rail article + article { padding-left: 22px; border-left: 1px solid #b9c4c1; }
.system-field-rail h3 { margin: 32px 0 10px; font-size: 20px; font-weight: 650; }
.system-field-rail p { max-width: 230px; margin-bottom: 0; color: var(--muted); font-size: 14px; line-height: 1.55; }
.contribution { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 54px; margin-top: 48px; padding: 26px 0; border-top: 1px solid var(--line); background: rgba(251,251,248,.58); }
.contribution h3 { margin: 0; padding-left: 22px; font-size: 18px; font-weight: 650; }
.contribution p { max-width: 760px; margin: 0; padding-right: 22px; color: #526360; font-size: 16px; line-height: 1.65; }
.responsibility-section { background: #1a1e1f; color: var(--white); border-color: #303638; }
.responsibility-section .section-label { color: #aeb9b8; }
.responsibility-section .section-number { color: var(--accent); }
.responsibility-layout { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 82px; }
.responsibility-lead { padding-top: 4px; }
.responsibility-lead h2 { max-width: 500px; margin-top: 70px; font-size: clamp(44px, 5vw, 66px); }
.core-statement { max-width: 390px; margin: 56px 0 0; color: #d7e1de; font-size: 23px; line-height: 1.4; }
.responsibility-body { padding-top: 4px; }
.responsibility-body .section-lead { color: #d0dcda; }
.responsibility-rows { margin-top: 46px; border-top: 1px solid #3a4344; }
.responsibility-rows article { padding: 22px 0; border-bottom: 1px solid #3a4344; }
.responsibility-rows h3 { margin-bottom: 6px; color: #f2f6f3; font-size: 20px; font-weight: 650; }
.responsibility-rows p { max-width: 510px; margin: 0; color: #d0dcda; font-size: 14px; line-height: 1.5; }
.section-tint { background: var(--tint); }
.mechanisms-section { padding-top: 112px; padding-bottom: 126px; }
.mechanism-list { max-width: 830px; margin-top: 58px; border-top: 1px solid #b8c2bf; }
.mechanism-list article { padding: 19px 0; border-bottom: 1px solid #b8c2bf; }
.mechanism-list h3 { margin-bottom: 5px; font-size: 19px; font-weight: 650; }
.mechanism-name { font-size: .85em; font-weight: 500; }
.mechanism-list p { margin-bottom: 0; color: #566366; font-size: 14px; line-height: 1.45; }
.console-section { background: #dfe7e5; border-color: #becac7; }
.console-layout { display: grid; grid-template-columns: minmax(280px, .75fr) minmax(0, 1.25fr); gap: 72px; align-items: center; }
.console-copy .section-label { margin-bottom: 56px; }
.console-copy h2 { max-width: 440px; margin-bottom: 26px; }
.console-section .section-lead { max-width: 420px; color: #4f5d5b; font-size: 17px; }
.console-link { display: inline-block; margin-top: 30px; padding-bottom: 5px; color: var(--teal); border-bottom: 1px solid currentColor; text-decoration: none; font-size: 13px; }
.console-figure { min-width: 0; margin: 0; }
.console-figure img { display: block; width: 100%; border: 1px solid #c2cfcb; background: #f7faf8; box-shadow: 0 24px 52px rgba(52, 74, 71, .12); }
.console-figure figcaption { display: flex; justify-content: space-between; gap: 20px; padding-top: 12px; color: #526360; font-size: 10px; letter-spacing: .07em; }
.evidence-close { padding-top: 126px; padding-bottom: 112px; }
.evidence-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 26px; margin-top: 56px; }
.evidence-grid article { min-height: 170px; padding-top: 16px; border-top: 1px solid var(--line); }
.evidence-grid h3 { margin: 22px 0 14px; color: var(--muted); font-size: 16px; font-weight: 500; line-height: 1.5; }
.evidence-grid p { max-width: 275px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.5; }
.evidence-grid .acceptance-result { min-height: 60px; margin-bottom: 16px; color: var(--ink); font-size: 20px; line-height: 1.5; }
.acceptance-result strong { font-weight: 650; }
.evidence-links { display: flex; justify-content: space-between; gap: 24px; margin-top: 44px; padding-top: 14px; border-top: 1px solid var(--line); color: #59706f; font-size: 11px; letter-spacing: .07em; }
.evidence-links a { text-decoration: none; border-bottom: 1px solid currentColor; }
.next-project { display: flex; align-items: end; justify-content: space-between; min-height: 340px; padding-top: 80px; padding-bottom: 84px; border-top: 1px solid var(--line); }
.next-project h2 { margin: 18px 0 0; font-size: clamp(42px, 6vw, 80px); }
.next-arrow { color: #6b7777; font-size: 88px; line-height: .7; }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); }

/* Motion stays subordinate to the page's reading order. Without JS, all content remains visible. */
[data-motion] {
  --motion-duration: 680ms;
  --motion-ease: cubic-bezier(.2, .74, .22, 1);
  transition-delay: var(--motion-delay, 0ms);
}
html.motion-ready [data-motion="load"],
html.motion-ready [data-motion="reveal"] {
  opacity: 0;
  transform: translateY(22px);
}
html.motion-ready [data-motion="load-scale"],
html.motion-ready [data-motion="reveal-scale"] {
  opacity: 0;
  transform: translateY(18px) scale(.985);
}
html.motion-ready [data-motion].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity var(--motion-duration) var(--motion-ease) var(--motion-delay, 0ms), transform var(--motion-duration) var(--motion-ease) var(--motion-delay, 0ms);
}
html.motion-ready .hero-art-shell.is-visible {
  transition-duration: 900ms;
}

@media (hover: hover) and (pointer: fine) and (prefers-reduced-motion: no-preference) {
  .system-field-rail h3, .responsibility-rows h3, .mechanism-list h3, .evidence-grid h3 {
    transition: color 200ms ease;
  }
  .system-field-rail article:hover h3 { color: var(--teal); }
  .responsibility-rows article:hover h3 { color: var(--accent); }
  .mechanism-list article:hover h3 { color: var(--teal); }
  .evidence-grid article:hover h3 { color: var(--teal); }
  .console-figure img { transition: transform 500ms var(--motion-ease), box-shadow 500ms var(--motion-ease); }
  .console-figure:hover img { transform: scale(1.012); box-shadow: 0 30px 64px rgba(52, 74, 71, .16); }
  .back-link, .evidence-links a { transition: color 200ms ease; }
  .back-link:hover, .evidence-links a:hover { color: var(--teal); }
}

a:focus-visible { outline: 2px solid var(--teal); outline-offset: 6px; }

@media print {
  html.motion-ready [data-motion] { opacity: 1 !important; transform: none !important; transition: none !important; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-motion],
  html.motion-ready [data-motion="load"],
  html.motion-ready [data-motion="load-scale"],
  html.motion-ready [data-motion="reveal"],
  html.motion-ready [data-motion="reveal-scale"] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

@media (min-width: 861px) {
  .mechanism-list p { white-space: nowrap; }
}

@media (max-width: 860px) {
  .shell, .site-header { width: min(calc(100% - 40px), var(--max)); }
  .hero { padding-top: 78px; }
  .hero-art { height: 610px; }
  .hero-meta { grid-template-columns: 1fr; gap: 0; max-width: 620px; margin-top: 34px; }
  .hero-meta span { padding: 11px 0; }
  .split-section, .responsibility-layout, .console-layout { grid-template-columns: 1fr; gap: 34px; }
  .section { padding: 88px 0; }
  .overview-section { padding-bottom: 96px; }
  .overview-section .section-intro { padding-bottom: 50px; }
  .system-field-rail { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contribution { grid-template-columns: 1fr; gap: 14px; margin-top: 32px; padding: 22px; }
  .contribution h3, .contribution p { padding: 0; }
  .system-field-rail article:nth-child(3) { padding-left: 0; border-left: 0; }
  .system-field-rail article:nth-child(3), .system-field-rail article:nth-child(4) { border-top: 1px solid #b9c4c1; }
  .responsibility-lead h2 { margin-top: 38px; }
  .core-statement { margin-top: 32px; }
  .console-layout { gap: 48px; }
  .console-copy .section-label { margin-bottom: 32px; }
  .console-section .section-lead { max-width: 650px; }
  .evidence-grid { grid-template-columns: 1fr; gap: 0; }
  .evidence-grid article { min-height: 0; padding: 22px 0; }
  .evidence-grid p { max-width: 560px; }
  .evidence-grid .acceptance-result { min-height: 0; margin-bottom: 12px; }
}

@media (max-width: 560px) {
  .site-header { min-height: 62px; font-size: 9px; }
  .back-link { font-size: 13px; letter-spacing: 0; }
  .header-meta { display: none; }
  .shell, .site-header { width: min(calc(100% - 32px), var(--max)); }
  h1 { font-size: 44px; }
  h2 { font-size: 40px; }
  .desktop-only { display: none; }
  .hero-deck { font-size: 18px; }
  .hero-art-shell { margin-top: 44px; }
  .hero-art { height: 520px; }
.console-figure figcaption { align-items: flex-start; flex-direction: column; gap: 6px; }
  .system-field-rail { grid-template-columns: 1fr; }
  .system-field-rail article, .system-field-rail article + article { min-height: 0; padding: 16px 0; border-left: 0; }
  .system-field-rail h3 { margin: 18px 0 7px; }
  .responsibility-rows article { padding: 19px 0; }
  .responsibility-rows h3 { font-size: 18px; }
  .mechanism-list p { white-space: normal; }
  .console-copy h2 { font-size: 40px; }
  .next-project { min-height: 260px; }
  .next-arrow { font-size: 62px; }
  .site-footer { align-items: flex-start; flex-direction: column; gap: 8px; padding: 24px 0; }
}