@charset "UTF-8";
:root { color-scheme: light; --ink: #183b43; --muted: #52696b; --paper: #faf7ee; --line: #d9e1db; --blue: #186781; --yellow: #f5cf66; --red: #ba493b; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif; line-height: 1.85; -webkit-font-smoothing: antialiased; }
a { color: var(--blue); text-underline-offset: .25em; }
button { font: inherit; }
button, summary { -webkit-tap-highlight-color: transparent; }
button, a, summary { touch-action: manipulation; }
img { display: block; max-width: 100%; height: auto; }
[hidden] { display: none !important; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.5; overflow-wrap: anywhere; }
p { margin-bottom: 1em; }
:focus-visible { outline: 3px solid #d4492d; outline-offset: 5px; }
::selection { background: var(--yellow); color: var(--ink); }
.container { width: min(1100px, calc(100% - 80px)); margin-inline: auto; }
.skip-link { position: absolute; left: 12px; top: -80px; padding: 12px 20px; background: var(--ink); color: white; z-index: 10; }
.skip-link:focus { top: 12px; }
.site-header { border-bottom: 1px solid var(--line); }
.header-inner { width: min(1240px, calc(100% - 80px)); margin: auto; min-height: 92px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.wordmark { display: flex; align-items: center; gap: 14px; color: var(--ink); text-decoration: none; font-size: 23px; font-weight: 800; letter-spacing: .045em; line-height: 1.4; }
.header-link { display: inline-flex; align-items: center; min-height: 44px; font-size: 12px; font-weight: 700; color: var(--ink); text-decoration: none; padding: 12px 0 12px 12px; flex-shrink: 0; }
.header-link span { margin-left: 12px; }
.hero { padding: 70px 0 65px; position: relative; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 1fr; align-items: center; gap: 42px; }
.eyebrow { font-size: 11px; letter-spacing: .12em; font-weight: 700; margin-bottom: 23px; line-height: 1.7; }
.hero-copy .eyebrow { letter-spacing: .035em; display: flex; align-items: center; gap: 8px; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: #317857; flex-shrink: 0; }
.hero h1 { font-size: clamp(2.55rem, 4.7vw, 4rem); font-weight: 800; line-height: 1.5; letter-spacing: -.045em; margin-bottom: 24px; }
.highlight { background: linear-gradient(transparent 69%, var(--yellow) 69%, var(--yellow) 93%, transparent 93%); }
.hero-lead { font-size: 17px; font-weight: 700; line-height: 1.95; margin-bottom: 17px; }
.hero-sub { font-size: 14px; color: var(--muted); margin-bottom: 30px; }
.button { display: inline-flex; min-height: 54px; justify-content: space-between; align-items: center; gap: 28px; padding: 13px 23px; border-radius: 7px; text-decoration: none; font-size: 14px; font-weight: 700; transition: background .18s, transform .18s; }
.button-primary { color: white; background: var(--ink); }
.button-primary:hover { background: #285865; transform: translateY(-2px); }
.button-secondary { border: 1px solid var(--ink); color: var(--ink); background: transparent; }
.button-secondary:hover { background: #e8eee6; }
.hero-note { font-size: 10px; color: var(--muted); line-height: 1.7; margin: 17px 0 0; max-width: 340px; }
.hero-visual { height: 470px; position: relative; isolation: isolate; }
.scene-orbit { position: absolute; width: 390px; height: 390px; max-width: 94%; left: 4%; top: 22px; border: 1px solid #d7e3d9; border-radius: 50%; background: radial-gradient(circle at 30% 60%, #e6f0e6 0, #edf1df 42%, transparent 68%); z-index: -1; }
.scene-orbit::after { content: ""; position: absolute; inset: 28px; border: 1px dashed #cbd9cb; border-radius: 50%; }
.qr-ticket { position: absolute; top: 65px; left: 0; width: 218px; padding: 17px 18px 11px; background: white; border: 1px solid #d4dfd6; border-radius: 12px; transform: rotate(-9deg); box-shadow: 0 16px 35px #1c454013; }
.ticket-label { display: block; font-size: 10px; font-weight: 700; margin-bottom: 12px; text-align: center; }
.qr-ticket img { width: 100%; }
.ticket-bottom { display: flex; justify-content: space-between; margin-top: 8px; font-size: 9px; letter-spacing: .15em; align-items: center; }
.ticket-bottom span:last-child { font-size: 23px; line-height: 1; }
.hero-character { position: absolute; width: 235px; right: -8px; top: 44px; filter: drop-shadow(0 15px 12px #7256300d); }
.scene-bubble { position: absolute; right: 22px; top: 9px; font-size: 12px; font-weight: 700; padding: 10px 18px; background: var(--yellow); border-radius: 20px 20px 20px 0; transform: rotate(4deg); }
.scene-spark { position: absolute; color: #cb9f36; font-size: 38px; }
.spark-one { left: 20px; top: 0; transform: rotate(10deg); }
.spark-two { right: 0; top: 330px; font-size: 23px; }
.destination { position: absolute; left: 15px; right: 0; bottom: 23px; padding: 17px 20px; border: 1px solid #c5d8d3; background: #fcfefb; border-radius: 12px; display: flex; align-items: center; gap: 13px; box-shadow: 0 12px 26px #21453208; }
.destination-mark { font-size: 28px; color: var(--blue); }
.destination div { min-width: 0; }
.destination div > span { display: block; font-size: 10px; color: var(--muted); margin-bottom: 3px; }
.destination code { font-size: 14px; letter-spacing: -.03em; overflow-wrap: anywhere; }
.destination-check { margin-left: auto; color: #317857; border-radius: 50%; width: 27px; height: 27px; border: 1px solid #b7d4bf; font-size: 15px; text-align: center; line-height: 25px; flex-shrink: 0; }
.chapter-strip { border-block: 1px solid var(--line); display: flex; gap: 24px; justify-content: space-between; align-items: center; padding-block: 22px; font-size: 12px; }
.chapter-strip > span { color: var(--muted); }
.chapter-strip ol { display: flex; gap: 37px; list-style: none; padding: 0; margin: 0; }
.chapter-strip b { font-size: 10px; color: var(--blue); margin-right: 8px; font-family: monospace; }
.section { padding: 92px 0; }
.section-heading { margin-bottom: 39px; }
.section h2 { font-size: clamp(26px, 3vw, 35px); letter-spacing: -.035em; line-height: 1.6; font-weight: 800; margin-bottom: 20px; }
.section-heading > p:last-child, .takeaway-heading > p:last-child, .video-grid > div > p { font-size: 14px; color: var(--muted); }
.section .eyebrow { margin-bottom: 16px; }
.mechanism-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 60px; align-items: start; }
.pattern-board { background: #f0f3e9; border: 1px solid #d5dfd1; border-radius: 14px; padding: 27px 30px 19px; }
.board-title { display: flex; align-items: center; gap: 9px; font-size: 12px; font-weight: 700; margin-bottom: 23px; }
.tiny-squares { font-size: 21px; }
.pattern-image { position: relative; width: 232px; max-width: 100%; margin: auto; padding: 12px; background: white; }
.pattern-image img { width: 100%; }
.finder-frame { position: absolute; width: 27%; height: 27%; border: 3px solid var(--red); border-radius: 6px; }
.finder-one { left: 6%; top: 6%; }
.finder-two { right: 6%; top: 6%; }
.finder-three { left: 6%; bottom: 6%; }
.pattern-board > p { font-size: 11px; margin: 20px 0 0; text-align: center; }
.legend-dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--red); margin-right: 6px; }
.role-list { border-top: 1px solid #c6d3cd; }
.role-card { border-bottom: 1px solid #c6d3cd; }
.role-card summary { display: flex; align-items: center; gap: 18px; min-height: 91px; padding: 18px 0; cursor: pointer; list-style: none; }
.role-card summary::-webkit-details-marker { display: none; }
.role-number { border: 1px solid #bccdc7; border-radius: 50%; width: 35px; height: 35px; font: 12px/35px monospace; text-align: center; flex-shrink: 0; }
.role-card summary small { display: block; color: var(--muted); font-size: 10px; font-weight: 500; }
.role-card summary strong { display: block; font-size: 18px; letter-spacing: -.015em; }
.detail-plus { width: 16px; height: 16px; margin-left: auto; position: relative; flex-shrink: 0; }
.detail-plus::before, .detail-plus::after { content: ""; position: absolute; top: 7px; width: 14px; height: 1px; background: var(--ink); }
.detail-plus::after { transform: rotate(90deg); }
.role-card[open] .detail-plus::after { transform: rotate(0); }
.role-body { padding: 0 16px 17px 53px; font-size: 13px; color: var(--muted); }
.role-body p:last-child { margin-bottom: 0; }
.role-takeaway { border-left: 2px solid var(--yellow); padding-left: 12px; color: var(--ink); }
.question-section { background: #e8f0ed; border-block: 1px solid #d4e0da; position: relative; }
.question-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 72px; align-items: center; }
.question-grid > div:first-child { position: relative; }
.question-section h2 { margin-bottom: 15px; line-height: 1.55; }
.question-number { font-size: 74px; letter-spacing: -.06em; font-family: Georgia, serif; font-weight: 500; }
.question-grid > div > p { font-size: 13px; }
.question-decoration { position: absolute; right: 0; top: 34px; font: italic 140px Georgia, serif; color: #cddecf; z-index: 0; pointer-events: none; }
.question-grid > div:first-child > :not(.question-decoration) { position: relative; z-index: 1; }
.question-card { padding: 30px; background: #fcfcf8; border: 1px solid #cbdad0; border-radius: 14px; box-shadow: 0 8px 26px #183b4304; }
.question-label { color: var(--muted); font-size: 11px !important; margin-bottom: 10px; }
.question-card h3 { font-size: 18px; margin-bottom: 22px; }
.quiz-options { display: grid; gap: 12px; }
.quiz-options button { text-align: left; display: flex; align-items: center; gap: 12px; border: 1px solid #c8d5cc; background: white; color: var(--ink); border-radius: 7px; padding: 13px; min-height: 62px; cursor: pointer; font-size: 13px; font-weight: 700; line-height: 1.65; }
.quiz-options button > span { flex-shrink: 0; width: 27px; height: 27px; border-radius: 4px; background: #f1f2e9; text-align: center; font: 13px/27px monospace; }
.quiz-options button:hover { border-color: var(--blue); }
.quiz-options button[aria-pressed="true"] { background: #edf5e7; border: 2px solid #44715b; padding: 12px; }
.quiz-options button[data-answer="area"][aria-pressed="true"] { border-color: #bc684c; background: #fff3e8; }
.quiz-feedback { margin-top: 20px; border-top: 1px solid var(--line); padding-top: 20px; font-size: 13px; }
.quiz-feedback strong { display: block; color: var(--ink); margin-bottom: 8px; font-size: 15px; }
.quiz-feedback p { color: var(--muted); margin-bottom: 0; }
.quiz-fallback { font-size: 13px; }
.quiz-fallback summary { cursor: pointer; padding: 12px 0; font-weight: 700; }
.takeaway-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 65px; }
.takeaways article { display: flex; align-items: flex-start; gap: 19px; padding-bottom: 25px; margin-bottom: 25px; border-bottom: 1px solid var(--line); }
.takeaways article:last-child { margin-bottom: 0; }
.takeaways article > span { width: 36px; height: 36px; border-radius: 50%; background: #f1e5bd; color: var(--ink); text-align: center; font-size: 24px; line-height: 34px; flex-shrink: 0; }
.takeaways h3 { font-size: 16px; margin-bottom: 9px; }
.takeaways p { color: var(--muted); font-size: 13px; margin: 0; }
.experiment-note { margin: 40px 0 0; padding: 19px 22px; border-left: 2px solid #98b1a3; background: #f0f2e9; font-size: 11px; line-height: 1.95; color: var(--muted); }
.video-section { padding-top: 0; padding-bottom: 75px; }
.video-grid { border-top: 1px solid var(--line); padding-top: 60px; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.video-image { display: block; position: relative; border-radius: 10px; overflow: hidden; border: 1px solid #dedbd0; }
.video-image img { width: 100%; }
.play-label { position: absolute; bottom: 12px; left: 12px; background: #183b43eb; color: white; font-size: 11px; padding: 7px 13px; border-radius: 5px; }
.play-label span { font-size: 10px; margin-right: 6px; }
.video-grid h2 { font-size: 29px; }
.video-grid .button { margin-top: 5px; }
.sources { padding-bottom: 60px; font-size: 11px; color: var(--muted); }
.sources h2 { font-size: 12px; margin-bottom: 12px; }
.sources p { margin-bottom: 9px; }
.sources-note { font-size: 10px; }
.site-footer { background: #eaf0e6; border-top: 1px solid #d5dfd1; padding: 30px 0 24px; }
.footer-intro { display: flex; gap: 17px; align-items: center; margin-bottom: 23px; }
.footer-intro img { width: 70px; height: 70px; }
.footer-intro p { font-size: 12px; font-weight: 700; margin: 0; }
.footer-bottom { border-top: 1px solid #cfdacd; display: flex; align-items: center; flex-wrap: wrap; gap: 18px; padding-top: 20px; }
.footer-brand { color: var(--ink); font-weight: 700; font-size: 14px; text-decoration: none; }
.footer-bottom nav { display: flex; flex-wrap: wrap; gap: 3px 16px; margin-left: auto; }
.footer-bottom nav a { display: inline-flex; align-items: center; min-height: 44px; font-size: 11px; color: var(--muted); padding-block: 12px; }
.footer-bottom > small { flex-basis: 100%; font-size: 9px; color: var(--muted); }
.document-main { padding: 48px 0 80px; min-height: 60vh; }
.document { max-width: 760px; }
.back-link { font-size: 12px; display: inline-block; padding: 10px 0; margin-bottom: 38px; }
.document .eyebrow { margin-bottom: 12px; }
.document h1 { font-size: clamp(27px, 4vw, 38px); margin-bottom: 24px; }
.document h2 { font-size: 20px; margin-bottom: 15px; }
.document p, .document dd { font-size: 14px; overflow-wrap: anywhere; }
.document .lead { color: var(--muted); }
.document section { margin-top: 40px; }
.definition-list { display: grid; grid-template-columns: 140px 1fr; margin: 0; }
.definition-list dt, .definition-list dd { padding: 15px 0; border-bottom: 1px solid var(--line); margin: 0; }
.definition-list dt { font-size: 12px; font-weight: 700; padding-right: 16px; }
.not-found { padding-top: 30px; }
.not-found .button { margin-top: 20px; }
@media (max-width: 960px) {
  .container, .header-inner { width: calc(100% - 48px); }
  .hero-grid { gap: 24px; }
  .hero h1 { font-size: 42px; }
  .hero-visual { height: 400px; }
  .hero-character { width: 190px; right: -6px; top: 53px; }
  .qr-ticket { width: 170px; top: 62px; }
  .scene-orbit { width: 320px; height: 320px; }
  .destination { padding: 13px 15px; left: 0; bottom: 10px; }
  .destination code { font-size: 12px; }
  .destination-mark { font-size: 22px; }
  .spark-two { top: 300px; }
  .mechanism-grid, .question-grid, .takeaway-grid, .video-grid { gap: 30px; }
  .pattern-board { padding-inline: 20px; }
  .question-decoration { display: none; }
  .question-card { padding: 24px; }
  .role-card summary { gap: 12px; }
  .role-card summary strong { font-size: 16px; }
  .role-body { padding-left: 47px; }
}
@media (max-width: 700px) {
  .header-inner { min-height: 77px; gap: 9px; }
  .wordmark { font-size: 18px; gap: 9px; letter-spacing: .01em; }
  .header-link { font-size: 11px; padding-left: 3px; }
  .header-link span { margin-left: 3px; }
  .hero { padding: 32px 0 34px; }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 15px; }
  .hero .eyebrow { font-size: 10px; margin-bottom: 18px; }
  .hero h1 { font-size: clamp(32px, 10.4vw, 48px); margin-bottom: 18px; line-height: 1.5; }
  .hero-lead { font-size: 15px; margin-bottom: 12px; }
  .hero-sub { font-size: 14px; margin-bottom: 22px; }
  .button { font-size: 14px; gap: 25px; padding-inline: 20px; }
  .hero-note { font-size: 9px; margin-top: 12px; }
  .hero-visual { height: 330px; width: 330px; max-width: 100%; margin-inline: auto; }
  .scene-orbit { width: 290px; height: 290px; left: 5%; top: 6px; }
  .qr-ticket { width: 151px; left: 7px; top: 47px; padding: 12px 14px 8px; }
  .ticket-label { font-size: 8px; margin-bottom: 9px; }
  .ticket-bottom { font-size: 7px; }
  .hero-character { width: 178px; top: 22px; right: -3px; }
  .scene-bubble { top: 0; right: 7px; font-size: 10px; padding: 7px 14px; }
  .spark-one { top: -9px; left: 16px; font-size: 27px; }
  .spark-two { top: 233px; right: 4px; font-size: 21px; }
  .destination { bottom: 0; left: 0; right: 0; gap: 10px; padding: 12px 14px; }
  .destination div > span { font-size: 9px; }
  .destination code { font-size: 12px; }
  .chapter-strip { display: block; padding: 17px 0; }
  .chapter-strip > span { font-size: 10px; }
  .chapter-strip ol { justify-content: space-between; gap: 10px; font-size: 11px; margin-top: 11px; }
  .chapter-strip b { margin-right: 5px; }
  .section { padding: 57px 0; }
  .section .eyebrow { font-size: 10px; margin-bottom: 13px; }
  .section h2 { font-size: 26px; margin-bottom: 16px; }
  .section-heading { margin-bottom: 28px; }
  .section-heading > p:last-child, .takeaway-heading > p:last-child, .video-grid > div > p { font-size: 14px; }
  .desktop-break { display: none; }
  .mechanism-grid, .question-grid, .takeaway-grid, .video-grid { grid-template-columns: minmax(0, 1fr); gap: 27px; }
  .pattern-board { padding: 20px 22px 17px; }
  .board-title { font-size: 11px; margin-bottom: 16px; }
  .pattern-image { width: 213px; }
  .pattern-board > p { margin-top: 16px; font-size: 10px; }
  .role-card summary { gap: 12px; min-height: 88px; }
  .role-card summary strong { font-size: 16px; }
  .role-body { padding-left: 47px; padding-right: 0; font-size: 14px; }
  .question-section h2 { font-size: 28px; margin-bottom: 14px; }
  .question-number { font-size: 70px; }
  .question-grid > div > p { font-size: 14px; }
  .question-grid { gap: 22px; }
  .question-card { padding: 23px 20px; }
  .question-card h3 { font-size: 16px; margin-bottom: 18px; }
  .quiz-options button { font-size: 14px; gap: 10px; }
  .quiz-feedback { font-size: 14px; }
  .quiz-feedback strong { font-size: 14px; }
  .takeaways article { gap: 14px; padding-bottom: 23px; margin-bottom: 23px; }
  .takeaways h3 { font-size: 15px; }
  .takeaways p { font-size: 14px; }
  .experiment-note { font-size: 10px; padding: 16px 17px; margin-top: 26px; }
  .video-section { padding-top: 0; padding-bottom: 45px; }
  .video-grid { padding-top: 38px; gap: 27px; }
  .video-grid h2 { font-size: 26px; }
  .sources { font-size: 10px; padding-bottom: 38px; }
  .sources h2 { font-size: 11px; }
  .sources-note { font-size: 9px; }
  .footer-intro p { font-size: 11px; }
  .footer-intro img { width: 61px; height: 61px; }
  .footer-bottom { display: block; }
  .footer-bottom nav { margin: 10px 0 13px; gap: 1px 15px; }
  .footer-bottom nav a { font-size: 11px; }
  .footer-bottom > small { display: block; }
  .document-main { padding-top: 26px; padding-bottom: 55px; }
  .back-link { margin-bottom: 25px; }
  .document p, .document dd { font-size: 13px; }
  .definition-list { grid-template-columns: 100px 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

.wordmark img, .footer-brand img { display: block; width: 56px; height: 56px; }
@media (max-width: 640px) { .wordmark img, .footer-brand img { width: 44px; height: 44px; } }