:root {
  --purple: #6754f7;
  --purple-light: #9c8fff;
  --purple-pale: #eeebff;
  --ink: #11121c;
  --ink-soft: #1a1c2b;
  --paper: #f4f5f9;
  --white: #fff;
  --muted: #6c6e7c;
  --line: rgba(17, 18, 28, .14);
  --dark-line: rgba(255, 255, 255, .14);
  --shell: 1210px;
  --ease: cubic-bezier(.2, .72, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; -webkit-font-smoothing: antialiased; }
body.menu-open { overflow: hidden; }
[id] { scroll-margin-top: 100px; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { color: inherit; font: inherit; }
button:focus-visible, a:focus-visible { outline: 2px solid var(--purple-light); outline-offset: 4px; }
.shell { width: min(calc(100% - 48px), var(--shell)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 300; top: -60px; left: 18px; padding: 10px 15px; color: #fff; background: var(--purple); }
.skip-link:focus { top: 12px; }
.reading-progress { position: fixed; z-index: 220; top: 0; left: 0; width: 0; height: 3px; background: var(--purple); transition: width .08s linear; }

/* Header */
.site-header { position: fixed; z-index: 150; inset: 0 0 auto; color: #fff; background: rgba(17, 18, 28, .72); border-bottom: 1px solid rgba(255,255,255,.08); backdrop-filter: blur(16px); transition: color .25s, background .25s, border-color .25s; }
.site-header.scrolled { color: var(--ink); background: rgba(255,255,255,.95); border-color: var(--line); }
.header-inner { height: 78px; display: flex; align-items: center; gap: 38px; }
.brand { width: 110px; flex: 0 0 auto; }
.brand img { width: 100%; filter: brightness(0) invert(1); transition: filter .25s; }
.site-header.scrolled .brand img, body.menu-open .brand img { filter: none; }
.desktop-nav { display: flex; gap: 29px; margin-left: auto; font-size: 12px; }
.desktop-nav a { position: relative; opacity: .72; transition: opacity .2s; }
.desktop-nav a::after { content: ""; position: absolute; right: 0; bottom: -10px; left: 0; height: 1px; background: var(--purple-light); transform: scaleX(0); transition: transform .2s; }
.desktop-nav a:hover, .desktop-nav a.active { opacity: 1; }
.desktop-nav a.active::after { transform: scaleX(1); }
.header-actions { display: flex; align-items: center; gap: 20px; margin-left: 12px; }
.header-link { font-size: 12px; opacity: .72; }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; gap: 18px; padding: 0 23px; border: 1px solid transparent; border-radius: 0; font-size: 13px; font-weight: 700; cursor: pointer; transition: transform .22s, color .22s, background .22s; }
.button:hover { transform: translateY(-2px); }
.button-small { min-height: 42px; color: var(--ink); background: #fff; }
.site-header.scrolled .button-small { color: #fff; background: var(--ink); }
.menu-toggle { width: 42px; height: 42px; display: none; position: relative; padding: 0; border: 1px solid rgba(255,255,255,.18); background: transparent; }
.site-header.scrolled .menu-toggle { border-color: var(--line); }
.menu-toggle span { position: absolute; left: 11px; width: 18px; height: 1.5px; background: currentColor; transition: .25s; }
.menu-toggle span:first-child { top: 16px; }
.menu-toggle span:last-child { top: 23px; }
.menu-toggle[aria-expanded="true"] span:first-child { top: 20px; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { top: 20px; transform: rotate(-45deg); }
.mobile-menu { position: absolute; top: 68px; right: 0; left: 0; height: calc(100dvh - 68px); overflow-y: auto; padding: 18px 20px 90px; color: var(--ink); background: #fff; }
.mobile-menu[hidden] { display: none; }
.mobile-menu a { min-height: 54px; display: flex; align-items: center; border-bottom: 1px solid var(--line); font-size: 17px; font-weight: 700; }
.mobile-print { width: 100%; min-height: 50px; margin-top: 18px; border: 0; color: #fff; background: var(--purple); font-weight: 700; }
body.menu-open .site-header { color: var(--ink); background: #fff; border-color: var(--line); }

/* Hero */
.hero { min-height: 920px; position: relative; overflow: hidden; padding: 138px 0 0; color: #fff; background: var(--ink); }
.hero-grid, .final-grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px); background-size: 46px 46px; mask-image: radial-gradient(circle at 70% 45%, #000, transparent 78%); }
.hero::before { content: ""; position: absolute; width: 660px; height: 660px; top: 30px; right: -170px; border-radius: 50%; background: radial-gradient(circle, rgba(103,84,247,.38), transparent 68%); }
.hero-layout { position: relative; z-index: 1; display: grid; grid-template-columns: .92fr 1.08fr; gap: 75px; align-items: center; }
.breadcrumb { display: flex; gap: 9px; margin-bottom: 55px; color: rgba(255,255,255,.38); font-size: 10px; }
.breadcrumb b { color: rgba(255,255,255,.68); font-weight: 500; }
.eyebrow, .section-kicker { margin: 0 0 22px; color: var(--purple); font: 800 9px Arial, sans-serif; letter-spacing: .18em; }
.eyebrow { color: var(--purple-light); }
.eyebrow i { width: 8px; height: 8px; display: inline-block; margin-right: 9px; border-radius: 50%; background: var(--purple); box-shadow: 0 0 0 5px rgba(103,84,247,.15); }
.hero h1 { margin: 0; font-size: clamp(51px, 5.4vw, 72px); font-weight: 700; line-height: 1.12; letter-spacing: -.055em; }
.hero h1 em { color: var(--purple-light); font-style: normal; }
.hero-slogan { margin: 24px 0 0; color: #fff; font-size: 22px; font-weight: 700; }
.hero-lead { max-width: 620px; margin: 20px 0 0; color: rgba(255,255,255,.58); font-size: 15px; line-height: 1.9; }
.hero-actions { display: flex; align-items: center; gap: 27px; margin-top: 34px; }
.button-primary { color: #fff; background: var(--purple); }
.text-button { padding: 7px 0; border: 0; border-bottom: 1px solid rgba(255,255,255,.38); color: rgba(255,255,255,.75); background: transparent; font-size: 12px; cursor: pointer; }
.text-button span { margin-left: 12px; color: var(--purple-light); }
.hero-meta { display: flex; margin: 39px 0 0; }
.hero-meta div { min-width: 122px; padding-left: 16px; border-left: 1px solid rgba(255,255,255,.16); }
.hero-meta dt { color: rgba(255,255,255,.34); font: 8px Arial, sans-serif; letter-spacing: .12em; }
.hero-meta dd { margin: 8px 0 0; color: rgba(255,255,255,.72); font-size: 11px; }
.hero-cover { position: relative; margin: 0; border: 1px solid rgba(255,255,255,.16); background: rgba(255,255,255,.045); box-shadow: 0 45px 80px rgba(0,0,0,.28); }
.hero-cover img { width: 100%; height: auto; }
.hero-cover figcaption { display: grid; grid-template-columns: 150px 1fr; gap: 20px; align-items: center; min-height: 76px; padding: 16px 21px; border-top: 1px solid rgba(255,255,255,.13); }
.hero-cover figcaption span { color: var(--purple-light); font: 8px Arial, sans-serif; letter-spacing: .12em; }
.hero-cover figcaption b { font-size: 13px; }
.hero-strip { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(5, 1fr); margin-top: 66px; border: 1px solid rgba(255,255,255,.12); border-bottom: 0; }
.hero-strip span { min-height: 76px; display: flex; align-items: center; gap: 12px; padding: 15px 20px; border-left: 1px solid rgba(255,255,255,.12); color: rgba(255,255,255,.64); font-size: 12px; }
.hero-strip span:first-child { border-left: 0; }
.hero-strip small { color: var(--purple-light); font: 8px Arial, sans-serif; }

/* Report system */
.section { padding: 128px 0; }
.report-grid { display: grid; grid-template-columns: 170px 1fr; gap: 65px; align-items: start; }
.chapter-mark { position: sticky; top: 118px; display: flex; flex-direction: column; align-items: flex-start; gap: 12px; color: var(--muted); }
.chapter-mark span { width: 40px; height: 40px; display: grid; place-items: center; margin-bottom: 8px; border: 1px solid var(--line); color: var(--purple); font: 9px Arial, sans-serif; }
.chapter-mark b { color: var(--ink); font-size: 13px; }
.chapter-mark small { font: 8px Arial, sans-serif; letter-spacing: .13em; }
.chapter-mark.light { color: rgba(255,255,255,.42); }
.chapter-mark.light span { border-color: var(--dark-line); color: var(--purple-light); }
.chapter-mark.light b { color: #fff; }
.report-content { min-width: 0; }
.section-heading { display: grid; grid-template-columns: 1fr 310px; gap: 65px; align-items: end; margin-bottom: 62px; }
.section-heading .section-kicker { grid-column: 1 / 3; margin-bottom: -35px; }
.section-heading h2, .summary-lead h2 { margin: 0; font-size: clamp(38px, 4.3vw, 55px); font-weight: 650; line-height: 1.3; letter-spacing: -.045em; }
.section-heading > p, .summary-lead > p:last-child { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.9; }
.section-heading.light h2 { color: #fff; }
.section-heading.light > p { color: rgba(255,255,255,.5); }

/* Summary */
.summary { background: #fff; }
.summary-lead { display: grid; grid-template-columns: 1.1fr .9fr; gap: 60px; align-items: end; margin-bottom: 70px; }
.summary-lead .section-kicker { grid-column: 1 / 3; margin-bottom: -35px; }
.shift-list { border-top: 2px solid var(--ink); }
.shift-list article { display: grid; grid-template-columns: 65px 1fr; min-height: 150px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.shift-list article > span { color: var(--purple); font: 9px Arial, sans-serif; }
.shift-list small { color: var(--purple); font: 8px Arial, sans-serif; letter-spacing: .14em; }
.shift-list h3 { margin: 11px 0 9px; font-size: 23px; }
.shift-list p { max-width: 720px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }
.evidence-note { margin-top: 45px; padding: 28px 30px; border-left: 3px solid var(--purple); background: var(--purple-pale); }
.evidence-note > b { font-size: 16px; }
.evidence-note p { margin: 12px 0 18px; color: #5f5a7a; font-size: 13px; line-height: 1.8; }
.evidence-note div { display: flex; gap: 25px; flex-wrap: wrap; }
.evidence-note a { color: var(--purple); font-size: 11px; font-weight: 700; }

/* Framework */
.framework { color: #fff; background: var(--ink); }
.engine-board { display: grid; grid-template-columns: 1fr 230px 1fr; border: 1px solid var(--dark-line); }
.engine { min-height: 420px; padding: 38px 34px; }
.engine-geo { border-left: 1px solid var(--dark-line); }
.engine small { color: var(--purple-light); font: 8px Arial, sans-serif; letter-spacing: .14em; }
.engine h3 { margin: 48px 0 8px; font: 700 60px Arial, sans-serif; }
.engine > b { font-size: 16px; }
.engine ul { margin: 44px 0 0; padding: 0; list-style: none; }
.engine li { padding: 12px 0; border-top: 1px solid var(--dark-line); color: rgba(255,255,255,.55); font-size: 12px; }
.engine-core { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 25px; border-left: 1px solid var(--dark-line); text-align: center; }
.engine-core span { color: rgba(255,255,255,.35); font: 8px Arial, sans-serif; letter-spacing: .13em; }
.engine-core b { margin-top: 20px; font-size: 19px; }
.engine-core i { width: 82px; height: 82px; margin: 27px 0; border: 1px solid var(--purple-light); border-radius: 50%; background: radial-gradient(circle, var(--purple) 0 25%, transparent 27% 50%, rgba(103,84,247,.25) 52% 54%, transparent 56%); box-shadow: 0 0 50px rgba(103,84,247,.24); }
.engine-core p { margin: 0; color: rgba(255,255,255,.48); font-size: 11px; line-height: 1.8; }
.framework-rule { display: grid; grid-template-columns: 150px 1fr; gap: 35px; margin-top: 28px; padding-top: 27px; border-top: 1px solid var(--dark-line); }
.framework-rule span { color: var(--purple-light); font-size: 11px; font-weight: 700; }
.framework-rule p { margin: 0; color: rgba(255,255,255,.52); font-size: 13px; line-height: 1.8; }

/* Method */
.method { background: var(--paper); }
.workstreams { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 2px solid var(--ink); border-left: 1px solid var(--line); }
.workstreams article { min-height: 320px; padding: 29px 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(255,255,255,.45); transition: background .2s; }
.workstreams article:hover { background: #fff; }
.workstreams article > span { color: var(--purple); font: 9px Arial, sans-serif; }
.workstreams small { float: right; color: #9b9ca6; font: 8px Arial, sans-serif; letter-spacing: .13em; }
.workstreams h3 { margin: 75px 0 15px; font-size: 22px; }
.workstreams p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }
.workstreams b { display: block; margin-top: 26px; color: var(--purple); font-size: 11px; }

/* Anatomy */
.anatomy { background: #fff; }
.anatomy-layout { display: grid; grid-template-columns: 1.05fr .95fr; gap: 70px; align-items: center; }
.page-model { padding: 28px; border: 1px solid var(--line); background: var(--paper); box-shadow: 16px 16px 0 var(--purple-pale); }
.model-top { min-height: 95px; padding: 18px; border: 1px solid var(--line); background: #fff; }
.model-top small { display: block; margin-bottom: 18px; color: var(--purple); font: 8px Arial, sans-serif; letter-spacing: .13em; }
.model-top b { font-size: 18px; }
.model-answer { margin-top: 12px; padding: 18px; color: #fff; background: var(--purple); }
.model-answer span, .model-proof span { font: 8px Arial, sans-serif; letter-spacing: .13em; }
.model-answer p { margin: 12px 0 0; font-size: 12px; }
.model-grid { display: grid; grid-template-columns: 1fr 1fr; margin-top: 12px; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.model-grid span { min-height: 65px; display: grid; place-items: center; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; font-size: 11px; }
.model-proof { display: flex; align-items: center; gap: 9px; margin-top: 12px; padding: 15px; border: 1px solid var(--line); background: #fff; }
.model-proof span { margin-right: auto; color: var(--muted); }
.model-proof i { width: 34px; height: 6px; background: #d7d8df; }
.model-action { margin-top: 12px; padding: 15px; color: #fff; background: var(--ink); font-size: 11px; }
.anatomy-list { margin: 0; padding: 0; border-top: 2px solid var(--ink); list-style: none; }
.anatomy-list li { display: grid; grid-template-columns: 42px 1fr; min-height: 112px; padding: 21px 0; border-bottom: 1px solid var(--line); }
.anatomy-list li > span { color: var(--purple); font: 9px Arial, sans-serif; }
.anatomy-list h3 { margin: 0 0 9px; font-size: 17px; }
.anatomy-list p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.7; }

/* Roadmap */
.roadmap { color: #fff; background: var(--ink-soft); }
.roadmap-track { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--dark-line); border-left: 1px solid var(--dark-line); }
.roadmap-track article { min-height: 480px; padding: 30px 27px; border-right: 1px solid var(--dark-line); border-bottom: 1px solid var(--dark-line); }
.roadmap-time { display: flex; align-items: baseline; gap: 8px; }
.roadmap-time span { color: var(--purple-light); font: 8px Arial, sans-serif; }
.roadmap-time b { font: 600 25px Arial, sans-serif; }
.roadmap-track article > small { display: block; margin-top: 70px; color: rgba(255,255,255,.35); font: 8px Arial, sans-serif; letter-spacing: .14em; }
.roadmap-track h3 { margin: 13px 0 25px; font-size: 23px; }
.roadmap-track ul { margin: 0; padding: 0; list-style: none; }
.roadmap-track li { padding: 11px 0; border-top: 1px solid var(--dark-line); color: rgba(255,255,255,.6); font-size: 12px; }
.roadmap-track p { margin: 32px 0 0; color: var(--purple-light); font-size: 10px; line-height: 1.7; }

/* Metrics */
.measurement { background: #fff; }
.metric-table { border-top: 2px solid var(--ink); }
.metric-table > div { display: grid; grid-template-columns: .65fr 1fr 1fr 1fr; border-bottom: 1px solid var(--line); }
.metric-table span, .metric-table b, .metric-table p { min-height: 90px; margin: 0; padding: 22px 18px; border-left: 1px solid var(--line); font-size: 12px; line-height: 1.75; }
.metric-table > div > :first-child { border-left: 0; }
.metric-head { color: #fff; background: var(--ink); }
.metric-head span { min-height: 58px; color: rgba(255,255,255,.7); font-size: 10px; }
.metric-table b { font-size: 13px; }
.metric-table p { color: var(--muted); }
.measurement-note { display: grid; grid-template-columns: 180px 1fr; gap: 30px; margin-top: 28px; padding: 25px 0; border-top: 1px solid var(--line); }
.measurement-note b { color: var(--purple); font-size: 12px; }
.measurement-note p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

/* References + FAQ */
.references { background: var(--paper); }
.reference-list { margin: 0; padding: 0; border-top: 2px solid var(--ink); list-style: none; }
.reference-list li { display: grid; grid-template-columns: 45px 1fr 100px; gap: 20px; align-items: center; min-height: 105px; border-bottom: 1px solid var(--line); }
.reference-list li > span { color: var(--purple); font: 9px Arial, sans-serif; }
.reference-list b { font-size: 14px; }
.reference-list p { margin: 8px 0 0; color: var(--muted); font-size: 11px; }
.reference-list a { color: var(--purple); font-size: 10px; font-weight: 700; text-align: right; }
.source-date { margin: 25px 0 0; color: var(--muted); font-size: 11px; line-height: 1.7; }
.faq { background: #fff; }
.faq-layout { display: grid; grid-template-columns: .78fr 1.22fr; gap: 105px; }
.faq-intro { position: sticky; top: 115px; align-self: start; }
.faq-intro h2 { margin: 0; font-size: clamp(37px, 4vw, 52px); line-height: 1.3; letter-spacing: -.045em; }
.faq-intro > p { max-width: 430px; margin: 26px 0; color: var(--muted); font-size: 13px; line-height: 1.85; }
.faq-intro > a { display: inline-flex; gap: 15px; padding-bottom: 6px; border-bottom: 1px solid var(--ink); font-size: 12px; font-weight: 700; }
.faq-intro > a span { color: var(--purple); }
.faq-list { border-top: 2px solid var(--ink); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item button { width: 100%; display: grid; grid-template-columns: 38px 1fr 24px; gap: 14px; align-items: center; padding: 28px 0; border: 0; color: var(--ink); background: transparent; text-align: left; cursor: pointer; }
.faq-item button span { color: var(--purple); font: 9px Arial, sans-serif; }
.faq-item button b { font-size: 16px; }
.faq-item button i { width: 20px; height: 20px; position: relative; }
.faq-item button i::before, .faq-item button i::after { content: ""; position: absolute; top: 9px; left: 3px; width: 14px; height: 1.5px; background: var(--ink); transition: transform .2s; }
.faq-item button i::after { transform: rotate(90deg); }
.faq-item.open button i::after { transform: rotate(0); }
.faq-answer { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .3s var(--ease); }
.faq-answer > p { min-height: 0; overflow: hidden; margin: 0; padding: 0 36px; color: var(--muted); font-size: 13px; line-height: 1.85; }
.faq-item.open .faq-answer { grid-template-rows: 1fr; }
.faq-item.open .faq-answer > p { padding-bottom: 28px; }

/* Final + footer */
.final-cta { position: relative; overflow: hidden; padding: 115px 0; color: #fff; background: var(--purple); }
.final-grid { opacity: .4; mask-image: none; }
.final-layout { position: relative; z-index: 1; display: grid; grid-template-columns: 1.25fr .75fr; gap: 90px; align-items: end; }
.final-layout small { color: rgba(255,255,255,.55); font: 8px Arial, sans-serif; letter-spacing: .15em; }
.final-layout h2 { margin: 19px 0 0; font-size: clamp(41px, 4.6vw, 60px); line-height: 1.25; letter-spacing: -.05em; }
.final-layout p { margin: 0 0 28px; color: rgba(255,255,255,.72); font-size: 14px; line-height: 1.85; }
.button-white { color: var(--ink); background: #fff; }
.final-print { width: max-content; display: block; margin-top: 24px; padding: 0 0 6px; border: 0; border-bottom: 1px solid rgba(255,255,255,.5); color: #fff; background: transparent; font-size: 11px; cursor: pointer; }
.site-footer { padding: 68px 0 0; background: #f0f1f5; }
.footer-main { display: grid; grid-template-columns: .8fr 1.2fr; gap: 90px; padding-bottom: 55px; }
.footer-brand img { width: 116px; }
.footer-brand p { max-width: 350px; margin: 24px 0 0; color: var(--muted); font-size: 12px; line-height: 1.8; }
.footer-nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: 35px; }
.footer-nav div { display: flex; flex-direction: column; gap: 12px; font-size: 11px; }
.footer-nav b { margin-bottom: 8px; font-size: 12px; }
.footer-nav a { color: var(--muted); }
.footer-nav a:hover { color: var(--purple); }
.footer-bottom { min-height: 70px; display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--line); color: var(--muted); font-size: 10px; }
.footer-bottom span:last-child { display: flex; gap: 20px; }
.mobile-contact { display: none; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 1040px) {
  .desktop-nav { gap: 20px; }
  .header-link { display: none; }
  .hero-layout { gap: 40px; }
  .report-grid { grid-template-columns: 130px 1fr; gap: 45px; }
  .section-heading { grid-template-columns: 1fr 270px; gap: 40px; }
  .engine-board { grid-template-columns: 1fr 190px 1fr; }
  .faq-layout { gap: 65px; }
}

@media (max-width: 820px) {
  .desktop-nav, .header-actions > .button-small { display: none; }
  .header-actions { margin-left: auto; }
  .menu-toggle { display: block; }
  .hero { min-height: auto; padding-top: 118px; }
  .hero-layout { grid-template-columns: 1fr; }
  .hero-copy { max-width: 700px; }
  .hero-cover { max-width: 680px; margin-inline: auto; }
  .report-grid { grid-template-columns: 1fr; }
  .chapter-mark { position: static; display: grid; grid-template-columns: 40px auto 1fr; align-items: center; }
  .chapter-mark span { margin: 0; }
  .chapter-mark small { text-align: right; }
  .section-heading, .summary-lead { grid-template-columns: 1fr; gap: 25px; }
  .section-heading .section-kicker, .summary-lead .section-kicker { grid-column: auto; margin-bottom: 0; }
  .engine-board { grid-template-columns: 1fr 170px 1fr; }
  .workstreams { grid-template-columns: 1fr 1fr; }
  .anatomy-layout { gap: 40px; }
  .roadmap-track { grid-template-columns: 1fr; }
  .roadmap-track article { min-height: auto; }
  .roadmap-track article > small { margin-top: 40px; }
  .faq-layout, .final-layout { grid-template-columns: 1fr; }
  .faq-intro { position: static; }
}

@media (max-width: 560px) {
  body { padding-bottom: 62px; }
  [id] { scroll-margin-top: 78px; }
  .shell { width: min(calc(100% - 28px), var(--shell)); }
  .header-inner { height: 68px; }
  .brand { width: 93px; }
  .section { padding: 80px 0; }
  .hero { padding-top: 96px; }
  .breadcrumb { display: none; }
  .hero h1 { font-size: clamp(39px, 11.8vw, 48px); line-height: 1.16; }
  .hero-slogan { margin-top: 19px; font-size: 18px; }
  .hero-lead { font-size: 14px; }
  .hero-actions { flex-direction: column; align-items: stretch; gap: 16px; }
  .hero-actions .button { width: 100%; }
  .text-button { align-self: flex-start; }
  .hero-meta { display: grid; grid-template-columns: repeat(3, 1fr); }
  .hero-meta div { min-width: 0; padding-left: 10px; }
  .hero-meta dd { font-size: 9px; }
  .hero-cover { margin-top: 10px; }
  .hero-cover figcaption { grid-template-columns: 1fr; gap: 6px; min-height: auto; }
  .hero-strip { grid-template-columns: 1fr 1fr; margin-top: 28px; }
  .hero-strip span { min-height: 60px; padding: 12px; }
  .hero-strip span:nth-child(3), .hero-strip span:nth-child(5) { border-left: 0; border-top: 1px solid rgba(255,255,255,.12); }
  .hero-strip span:nth-child(4) { border-top: 1px solid rgba(255,255,255,.12); }
  .chapter-mark { grid-template-columns: 40px 1fr; margin-bottom: 40px; }
  .chapter-mark small { display: none; }
  .section-heading, .summary-lead { margin-bottom: 45px; }
  .section-heading h2, .summary-lead h2 { font-size: 32px; line-height: 1.4; }
  .shift-list article { grid-template-columns: 42px 1fr; min-height: 145px; }
  .shift-list h3 { font-size: 20px; }
  .evidence-note { padding: 23px 20px; }
  .evidence-note div { display: grid; gap: 12px; }
  .engine-board { grid-template-columns: 1fr; }
  .engine { min-height: auto; padding: 28px 24px; }
  .engine h3 { margin-top: 35px; font-size: 48px; }
  .engine ul { margin-top: 32px; }
  .engine-core { min-height: 250px; border-top: 1px solid var(--dark-line); border-left: 0; }
  .engine-geo { border-top: 1px solid var(--dark-line); border-left: 0; }
  .framework-rule { grid-template-columns: 1fr; gap: 14px; }
  .workstreams { grid-template-columns: 1fr; }
  .workstreams article { min-height: 270px; }
  .workstreams h3 { margin-top: 60px; }
  .anatomy-layout { grid-template-columns: 1fr; }
  .page-model { padding: 16px; box-shadow: 9px 9px 0 var(--purple-pale); }
  .metric-table { overflow-x: auto; }
  .metric-table > div { min-width: 700px; }
  .measurement-note { grid-template-columns: 1fr; gap: 13px; }
  .reference-list li { grid-template-columns: 30px 1fr; padding: 20px 0; }
  .reference-list a { grid-column: 2; text-align: left; }
  .faq-layout { gap: 52px; }
  .faq-intro h2 { font-size: 34px; }
  .faq-item button { grid-template-columns: 30px 1fr 20px; gap: 8px; }
  .faq-item button b { font-size: 14px; }
  .faq-answer > p { padding-inline: 38px 7px; font-size: 12px; }
  .final-cta { padding: 76px 0; }
  .final-layout { gap: 42px; }
  .final-layout h2 { font-size: 36px; }
  .footer-main { grid-template-columns: 1fr; gap: 38px; padding-bottom: 42px; }
  .footer-nav { grid-template-columns: 1fr 1fr; }
  .footer-nav div:first-child { display: none; }
  .footer-bottom { min-height: 90px; flex-direction: column; align-items: flex-start; justify-content: center; gap: 10px; }
  .footer-bottom span:last-child { gap: 13px; }
  .mobile-contact { position: fixed; z-index: 100; inset: auto 0 0; display: grid; grid-template-columns: .78fr 1.22fr; height: 62px; padding: 7px; gap: 7px; border-top: 1px solid var(--line); background: rgba(255,255,255,.96); backdrop-filter: blur(12px); }
  .mobile-contact a { display: grid; place-items: center; border: 1px solid var(--line); background: #fff; font-size: 12px; font-weight: 700; }
  .mobile-contact a:last-child { color: #fff; border-color: var(--purple); background: var(--purple); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media print {
  @page { size: A4; margin: 15mm; }
  body { padding: 0; color: #111; background: #fff; }
  .site-header, .reading-progress, .mobile-contact, .hero-actions, .final-cta, .site-footer, .skip-link { display: none !important; }
  .hero { min-height: auto; padding: 28mm 0 18mm; color: #111; background: #fff; }
  .hero::before, .hero-grid, .hero-strip { display: none; }
  .hero-layout { grid-template-columns: 1fr 1fr; gap: 12mm; }
  .hero h1, .hero-slogan { color: #111; }
  .hero h1 em, .eyebrow { color: var(--purple); }
  .hero-lead { color: #555; }
  .hero-meta dt { color: #777; }
  .hero-meta dd { color: #333; }
  .hero-cover { border-color: #ccc; box-shadow: none; }
  .hero-cover figcaption { color: #111; border-color: #ccc; }
  .section { padding: 14mm 0; color: #111 !important; background: #fff !important; break-inside: auto; }
  .shell { width: 100%; }
  .report-grid { grid-template-columns: 28mm 1fr; gap: 8mm; }
  .chapter-mark { position: static; }
  .chapter-mark.light, .chapter-mark.light b, .section-heading.light h2 { color: #111; }
  .section-heading.light > p { color: #666; }
  .engine-board, .roadmap-track { border-color: #ccc; }
  .engine, .engine-core, .roadmap-track article { color: #111; border-color: #ccc; }
  .engine li, .engine-core p, .roadmap-track li { color: #555; border-color: #ddd; }
  .workstreams article, .shift-list article, .anatomy-list li, .faq-item { break-inside: avoid; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .faq-answer { grid-template-rows: 1fr; }
  .faq-answer > p { padding-bottom: 20px; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 7pt; word-break: break-all; }
}