:root {
  color: #1a1a1a;
  background: #ffffff;
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", -apple-system, BlinkMacSystemFont, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  --blue-50: #f0f9ff;
  --blue-200: #c5e7f7;
  --blue-600: #3460fb;
  --blue-900: #0017c1;
  --blue-1000: #00118f;
  --green-50: #f1fff8;
  --green-700: #197a4a;
  --orange-50: #fff7f0;
  --orange-700: #b53b00;
  --yellow-300: #ffd43d;
  --magenta-900: #8b008b;
  --gray-50: #f7f7f7;
  --gray-200: #e6e6e6;
  --gray-420: #949494;
  --gray-536: #767676;
  --gray-700: #4a4a4a;
  --gray-900: #1a1a1a;
  --white: #ffffff;
  --black: #000000;
  --space-1: .5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-6: 3rem;
  --space-8: 4rem;
  --space-12: 6rem;
  --radius: .5rem;
}

* { box-sizing: border-box; }
html { color-scheme: light; scroll-behavior: smooth; scrollbar-gutter: stable; }
body { min-width: 320px; margin: 0; color: var(--gray-900); background: var(--white); font-size: 1rem; line-height: 1.8; }
button, input { font: inherit; }
a { color: var(--blue-1000); text-decoration-thickness: .0625rem; text-underline-offset: .2em; }
a:visited { color: var(--magenta-900); }
a:hover { text-decoration-thickness: .1875rem; }
:focus-visible { border-radius: .25rem; outline: .25rem solid var(--black); outline-offset: .125rem; box-shadow: 0 0 0 .125rem var(--yellow-300); }
.shell { width: min(72rem, calc(100% - 3rem)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 20; top: .5rem; left: .5rem; padding: .5rem 1rem; color: var(--white); background: var(--black); transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }

.site-header { border-bottom: 1px solid var(--gray-200); background: rgba(255, 255, 255, .96); }
.header-inner { display: flex; min-height: 4.5rem; align-items: center; justify-content: space-between; gap: 2rem; }
.brand:any-link { color: var(--gray-900); font-weight: 800; letter-spacing: .08em; text-decoration: none; }
nav { display: flex; gap: 1.5rem; }
nav a { color: var(--gray-700); font-size: .875rem; font-weight: 700; }

.hero { padding-block: 7.5rem 6rem; }
.eyebrow { margin: 0 0 .75rem; color: var(--blue-900); font-size: .75rem; font-weight: 800; letter-spacing: .16em; }
.hero h1 { max-width: 58rem; margin: 0; font-size: clamp(2.6rem, 6.2vw, 5.4rem); line-height: 1.13; letter-spacing: -.035em; }
.hero h1 span { color: var(--blue-900); }
.hero-lead { max-width: 52rem; margin: 2rem 0 0; font-size: clamp(1.1rem, 2vw, 1.35rem); line-height: 1.9; }
.answer-card { display: grid; max-width: 58rem; margin: 2.5rem 0; padding: 1.5rem 2rem; background: var(--blue-50); border-left: .5rem solid var(--blue-900); grid-template-columns: 8rem 1fr; gap: 1.5rem; }
.answer-card p { margin: 0; }
.answer-card__label { color: var(--blue-900); font-weight: 800; }
.primary-link:any-link { display: inline-flex; min-height: 3rem; align-items: center; gap: .75rem; padding: .5rem 1.25rem; color: var(--white); background: var(--blue-900); border: 2px solid var(--blue-900); border-radius: .25rem; font-weight: 700; text-decoration: none; }
.primary-link:hover { background: var(--blue-1000); }

.section { padding-block: var(--space-12); }
.section--tint { background: var(--gray-50); }
.section-heading { display: grid; margin-bottom: 3rem; grid-template-columns: 4.5rem 1fr; gap: 1.5rem; }
.section-number { margin: 0; color: var(--blue-900); font-size: 2.5rem; font-weight: 300; line-height: 1; }
.section-heading h2 { margin: 0; font-size: clamp(2rem, 4vw, 3.25rem); line-height: 1.3; letter-spacing: -.02em; }
.section-heading div > p:last-child { max-width: 48rem; margin: .75rem 0 0; color: var(--gray-700); }

.pipeline-layout { display: grid; grid-template-columns: minmax(17rem, 22rem) 1fr; gap: 3rem; align-items: start; }
.pipeline { position: relative; margin: 0; padding: 0; list-style: none; }
.pipeline::before { position: absolute; top: 1.5rem; bottom: 1.5rem; left: 1.45rem; width: 2px; background: var(--gray-200); content: ""; }
.pipeline li { position: relative; }
.pipeline-step { display: grid; width: 100%; padding: .85rem .75rem; color: var(--gray-900); background: transparent; border: 0; border-radius: var(--radius); cursor: pointer; text-align: left; grid-template-columns: 3rem 1fr; grid-template-rows: auto auto; }
.pipeline-step > span { z-index: 1; display: grid; width: 2.1rem; height: 2.1rem; color: var(--gray-700); background: var(--white); border: 2px solid var(--gray-420); border-radius: 50%; font-size: .8rem; font-weight: 800; place-items: center; grid-row: 1 / 3; }
.pipeline-step b { line-height: 1.35; }
.pipeline-step small { color: var(--gray-536); }
.pipeline-step:hover { background: var(--blue-50); }
.pipeline-step.is-active { background: var(--blue-50); }
.pipeline-step.is-active > span { color: var(--white); background: var(--blue-900); border-color: var(--blue-900); }
.pipeline-step.is-active b { color: var(--blue-900); }
.step-detail { min-height: 30rem; padding: 3rem; background: var(--white); border: 1px solid var(--gray-200); border-top: .5rem solid var(--blue-900); }
.detail-kicker { margin: 0 0 .5rem; color: var(--blue-900); font-size: .875rem; font-weight: 800; }
.step-detail h3 { margin: 0; font-size: clamp(1.65rem, 3vw, 2.5rem); line-height: 1.4; }
.step-detail > p:nth-of-type(2) { margin: 1.5rem 0 2.5rem; font-size: 1.1rem; }
.impact-list { display: grid; margin: 0; border-top: 1px solid var(--gray-200); }
.impact-list div { display: grid; padding: 1rem 0; border-bottom: 1px solid var(--gray-200); grid-template-columns: 8rem 1fr; gap: 1rem; }
.impact-list dt { color: var(--gray-536); font-weight: 700; }
.impact-list dd { margin: 0; }
.loop-note { margin-top: 2rem; padding: 1.25rem 1.5rem; background: var(--white); border: 1px solid var(--blue-200); }

.learning-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.learning-card { padding: 2rem; border-top: .5rem solid; }
.learning-card--blue { background: var(--blue-50); border-color: var(--blue-900); }
.learning-card--green { background: var(--green-50); border-color: var(--green-700); }
.learning-card--orange { background: var(--orange-50); border-color: var(--orange-700); }
.learning-card__number { margin: 0; font-size: 2.5rem; font-weight: 300; }
.learning-card h3 { margin: .25rem 0 0; font-size: 1.5rem; }
.learning-card__method { margin: .25rem 0 1.5rem; color: var(--gray-700); font-size: .875rem; font-weight: 700; }
.example { padding-top: 1rem; border-top: 1px solid rgba(26, 26, 26, .2); font-size: .9rem; }
.example span { display: block; font-weight: 800; }
.caption { max-width: 54rem; margin: 2rem 0 0; color: var(--gray-536); font-size: .875rem; }

.section--dark { color: var(--white); background: #111827; }
.section-heading--light .eyebrow, .section-heading--light .section-number { color: #9ec5ff; }
.section-heading--light div > p:last-child { color: #d1d5db; }
.case-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.case-card { overflow: hidden; color: var(--gray-900); background: var(--white); border-radius: var(--radius); }
.case-card__top { padding: 2rem; border-bottom: 1px solid var(--gray-200); }
.maker { margin: 0; color: var(--blue-900); font-size: .75rem; font-weight: 800; letter-spacing: .16em; }
.case-card h3 { margin: .25rem 0 .75rem; font-size: 2rem; }
.case-card__top p:last-child { margin: 0; }
.evidence { padding: 1.5rem 2rem; border-bottom: 1px solid var(--gray-200); }
.evidence__label { margin: 0 0 .75rem; font-size: .875rem; font-weight: 800; }
.evidence__label span { display: inline-block; width: .65rem; height: .65rem; margin-right: .5rem; border-radius: 50%; }
.evidence--known .evidence__label span { background: var(--green-700); }
.evidence--inferred { background: var(--gray-50); }
.evidence--inferred .evidence__label span { background: var(--orange-700); }
.evidence ul { margin: 0; padding-left: 1.25rem; }
.evidence > p:last-child { margin: 0; }
.source-link:any-link { display: block; padding: 1.25rem 2rem; color: var(--blue-1000); font-weight: 700; }
.case-conclusion { max-width: 58rem; margin: 3rem auto 0; padding: 2rem; border: 1px solid #566174; }
.case-conclusion p { margin: 0; }
.case-conclusion__title { margin-bottom: .5rem !important; color: #9ec5ff; font-weight: 800; }

.lab-panel { display: grid; border: 1px solid var(--gray-200); grid-template-columns: 1fr 1fr; }
.controls, .outcomes { padding: 2.5rem; }
.controls { background: var(--gray-50); }
.control + .control { margin-top: 1.5rem; }
.control__head, .metric__head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }
.control label { font-weight: 800; }
.control output { min-width: 2.5rem; color: var(--blue-900); font-size: 1.25rem; font-weight: 800; text-align: right; }
.control input { width: 100%; accent-color: var(--blue-900); cursor: pointer; }
.control p { margin: .1rem 0 0; color: var(--gray-536); font-size: .8rem; }
.reset-button { min-height: 2.75rem; margin-top: 2rem; padding: .5rem 1rem; color: var(--blue-1000); background: var(--white); border: 1px solid var(--blue-900); border-radius: .25rem; cursor: pointer; font-weight: 700; }
.reset-button:hover { background: var(--blue-50); }
.outcomes h3 { margin-top: 0; font-size: 1.5rem; }
.metric + .metric { margin-top: 1.25rem; }
.metric__head { font-size: .9rem; font-weight: 700; }
.metric__head output { color: var(--gray-536); }
.meter { overflow: hidden; height: .75rem; margin-top: .35rem; background: var(--gray-200); border-radius: 999px; }
.meter span { display: block; width: 0; height: 100%; background: var(--blue-600); border-radius: inherit; transition: width .2s ease; }
.lab-reading { margin: 2rem 0 0; padding: 1rem; background: var(--blue-50); border-left: .25rem solid var(--blue-900); }

.myth-list { max-width: 58rem; margin-left: 6rem; border-top: 1px solid var(--gray-420); }
.myth-list details { border-bottom: 1px solid var(--gray-420); }
.myth-list summary { padding: 1.5rem 3rem 1.5rem 0; cursor: pointer; font-size: 1.15rem; font-weight: 800; }
.myth-list summary span { display: inline-block; min-width: 5.5rem; color: var(--blue-900); font-size: .75rem; letter-spacing: .06em; }
.myth-list details p { max-width: 46rem; margin: -1rem 0 1.5rem 5.5rem; }

.source-list { max-width: 58rem; margin: 0 0 0 6rem; padding: 0; list-style-position: inside; }
.source-list li { padding: 1.25rem 0; border-top: 1px solid var(--gray-200); }
.source-list a { font-weight: 800; }
.source-list span { display: block; margin-left: 1.5rem; color: var(--gray-536); font-size: .875rem; }
.updated { margin: 2rem 0 0 6rem; color: var(--gray-536); font-size: .8rem; }
.site-footer { padding-block: 3rem; color: var(--white); background: #111827; }
.footer-inner { display: flex; align-items: end; justify-content: space-between; gap: 2rem; }
.footer-inner p { margin: 0; }
.footer-inner a { color: var(--white); }

@media (max-width: 55rem) {
  .hero { padding-block: 5rem; }
  .pipeline-layout, .lab-panel { grid-template-columns: 1fr; }
  .pipeline { display: grid; grid-template-columns: repeat(2, 1fr); gap: .5rem; }
  .pipeline::before { display: none; }
  .learning-grid { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; }
  .myth-list, .source-list, .updated { margin-left: 0; }
}

@media (max-width: 40rem) {
  .shell { width: min(100% - 2rem, 72rem); }
  nav { display: none; }
  .hero { padding-block: 4rem; }
  .answer-card { padding: 1.25rem; grid-template-columns: 1fr; gap: .25rem; }
  .section { padding-block: 4rem; }
  .section-heading { grid-template-columns: 1fr; gap: .75rem; }
  .section-number { font-size: 1.5rem; }
  .pipeline { grid-template-columns: 1fr; }
  .step-detail { min-height: 0; padding: 1.5rem; }
  .impact-list div { grid-template-columns: 1fr; gap: .25rem; }
  .controls, .outcomes { padding: 1.5rem; }
  .myth-list summary span { display: block; margin-bottom: .25rem; }
  .myth-list details p { margin-left: 0; }
  .source-list span { margin-left: 0; }
  .footer-inner { display: grid; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}