:root {
  --navy: #000c2e;
  --navy-deep: #000719;
  --blue: #395186;
  --lavender: #9296d1;
  --teal: #49c4c1;
  --paper: #f6f7f9;
  --ink: #151923;
  --muted: #647080;
  --serif: "Times New Roman", "游明朝", "Yu Mincho", "Hiragino Mincho ProN", serif;
  --sans: Arial, "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.9;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.page-width { width: min(1180px, calc(100% - 80px)); margin: 0 auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: -50px; left: 20px; z-index: 20; padding: 8px 16px; color: #fff; background: var(--navy); }
.skip-link:focus { top: 20px; }

.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 10;
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,.22);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 104px; padding: 0 42px; }
.brand { flex: 0 0 auto; }
.brand-mark { width: auto; height: 82px; }
.brand-mark-mobile { display: none; }
.site-nav { display: flex; align-items: center; gap: 38px; font-size: 12px; letter-spacing: .18em; }
.site-nav a { position: relative; padding: 40px 0; }
.site-nav a::after { position: absolute; right: 0; bottom: 29px; left: 0; height: 2px; background: var(--teal); content: ""; transform: scaleX(0); transition: transform .25s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { transform: scaleX(1); }
.menu-toggle { display: none; border: 0; background: transparent; }

.hero { position: relative; min-height: 760px; height: min(92vh, 900px); overflow: hidden; color: #fff; background: var(--navy); }
.hero-slides, .hero-slide, .hero-overlay { position: absolute; inset: 0; }
.hero-slide { background-position: center; background-size: cover; opacity: 0; transform: scale(1.04); transition: opacity 1.4s ease, transform 7s ease; }
.hero-slide.is-active { opacity: 1; transform: scale(1); }
.hero-overlay { background: linear-gradient(90deg, rgba(0,12,46,.88) 0%, rgba(0,12,46,.53) 45%, rgba(0,12,46,.2) 100%); }
.hero-content { position: relative; z-index: 1; display: flex; flex-direction: column; justify-content: center; min-height: inherit; padding-top: 84px; }
.eyebrow, .section-kicker { margin: 0 0 17px; color: var(--teal); font-size: 11px; font-weight: 700; letter-spacing: .23em; }
.hero h1 { max-width: 730px; margin: 0 0 22px; font-family: var(--serif); font-size: clamp(38px, 5vw, 68px); font-weight: 400; line-height: 1.35; letter-spacing: .05em; }
.hero-description { max-width: 590px; margin: 0 0 32px; color: rgba(255,255,255,.83); font-size: 15px; line-height: 2.1; }
.outline-button, .primary-button { display: inline-flex; align-items: center; justify-content: space-between; width: fit-content; min-width: 220px; padding: 13px 21px; border: 1px solid rgba(255,255,255,.7); font-size: 13px; letter-spacing: .08em; transition: color .25s ease, background .25s ease, border-color .25s ease; }
.outline-button span, .primary-button span { margin-left: 26px; font-size: 18px; }
.outline-button:hover, .outline-button:focus-visible { color: var(--navy); border-color: #fff; background: #fff; }
.hero-dots { position: absolute; z-index: 2; right: 42px; bottom: 43px; display: flex; gap: 10px; }
.hero-dots button { width: 7px; height: 7px; padding: 0; border: 1px solid #fff; border-radius: 50%; background: transparent; cursor: pointer; }
.hero-dots button.is-active { background: var(--teal); border-color: var(--teal); }
.scroll-cue { position: absolute; z-index: 2; bottom: 34px; left: 42px; display: flex; align-items: center; gap: 14px; color: rgba(255,255,255,.8); font-size: 10px; letter-spacing: .2em; writing-mode: vertical-rl; }
.scroll-cue i { display: block; width: 1px; height: 53px; background: rgba(255,255,255,.7); }

.notice-bar { color: var(--navy); background: #eef0fa; }
.notice-inner { display: flex; align-items: center; justify-content: center; gap: 24px; min-height: 64px; }
.notice-label { padding: 3px 12px; color: #fff; background: var(--blue); font-size: 11px; font-weight: 700; letter-spacing: .12em; }
.notice-inner p { margin: 0; font-size: 14px; }

.affiliation-band { color: #fff; background: var(--navy); }
.affiliation-grid { display: grid; grid-template-columns: 1.1fr 1fr 1fr; gap: 42px; align-items: center; min-height: 126px; }
.affiliation-grid p { margin: 0; padding: 9px 0 9px 24px; border-left: 1px solid rgba(255,255,255,.28); font-size: 13px; line-height: 1.8; }
.affiliation-grid p:first-child { padding-left: 0; border-left: 0; font-family: var(--serif); font-size: 23px; letter-spacing: .08em; }

.section { padding: 122px 0; }
.section-intro { background: #fff; }
.intro-grid { display: grid; grid-template-columns: .82fr 1.18fr; gap: 100px; }
.section-heading h2, .method-copy h2 { margin: 0; font-family: var(--serif); font-size: clamp(32px, 4vw, 48px); font-weight: 400; line-height: 1.45; letter-spacing: .06em; }
.heading-line { display: block; width: 54px; height: 2px; margin-top: 25px; background: var(--teal); }
.intro-copy { padding-top: 39px; }
.intro-copy h3 { margin: 0 0 27px; font-family: var(--serif); font-size: clamp(25px, 3vw, 35px); font-weight: 400; line-height: 1.65; }
.intro-copy p { max-width: 660px; margin: 0 0 20px; color: var(--muted); font-size: 15px; line-height: 2.15; }

.research-section { padding-top: 106px; background: var(--paper); }
.section-heading-centered { text-align: center; }
.section-heading-centered .heading-line { margin-right: auto; margin-left: auto; }
.research-section-title { margin: 0; font-family: var(--serif); font-size: clamp(27px, 3.2vw, 39px); font-weight: 400; line-height: 1.5; letter-spacing: .06em; }
.research-feature { display: grid; grid-template-columns: 1.03fr .97fr; gap: 80px; align-items: center; margin-top: 72px; }
.research-feature-image { position: relative; overflow: hidden; }
.research-feature-image::before { position: absolute; top: 20px; right: -20px; bottom: -20px; left: 20px; border: 1px solid var(--lavender); content: ""; }
.research-feature-image img { position: relative; width: 100%; aspect-ratio: 1.45; object-fit: cover; }
.research-feature-copy { padding-right: 5%; }
.feature-number { margin: 0 0 10px; color: var(--blue); font-size: 13px; letter-spacing: .15em; }
.research-feature-title { margin: 0 0 24px; font-family: var(--serif); font-size: clamp(25px, 3vw, 37px); font-weight: 400; line-height: 1.5; }
.research-feature-copy p:not(.feature-number) { margin: 0 0 17px; color: var(--muted); font-size: 15px; line-height: 2.1; }
.research-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 82px; }
.research-card { background: #fff; box-shadow: 0 12px 30px rgba(0,12,46,.06); }
.research-card-image { overflow: hidden; aspect-ratio: 1; }
.research-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.research-card:hover img { transform: scale(1.06); }
.research-card-body { padding: 21px 19px 25px; }
.research-card-body span { color: var(--blue); font-size: 10px; letter-spacing: .11em; }
.research-card-body h3 { margin: 7px 0 9px; font-family: var(--serif); font-size: 22px; font-weight: 400; line-height: 1.45; }
.research-card-body p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

.method-section { color: #fff; background: var(--navy); }
.method-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; align-items: center; }
.method-section-title { margin: 0; font-family: var(--serif); font-size: clamp(27px, 3.3vw, 40px); font-weight: 400; line-height: 1.5; letter-spacing: .06em; }
.method-copy .heading-line { margin-bottom: 31px; }
.method-copy > p:last-child, .method-copy > p:nth-last-child(2) { max-width: 570px; margin: 0 0 16px; color: rgba(255,255,255,.75); font-size: 14px; line-height: 2.15; }
.method-visual { position: relative; min-height: 430px; background: linear-gradient(145deg, rgba(146,150,209,.45), rgba(73,196,193,.1)), url("images/02_img_3_xgH-.jpg") center/cover; }
.method-visual::after { position: absolute; inset: 20px; border: 1px solid rgba(255,255,255,.65); content: ""; }
.method-visual-label { position: absolute; z-index: 1; top: 50%; left: 50%; color: #fff; font-family: var(--serif); font-size: 35px; letter-spacing: .14em; line-height: 1.2; text-align: center; transform: translate(-50%, -50%); }
.method-visual-label small { color: var(--teal); font-family: var(--sans); font-size: 21px; }

.contact-section { padding-bottom: 110px; }
.contact-lead { margin: 37px auto 26px; color: var(--muted); font-size: 15px; text-align: center; }
.primary-button { color: #fff; border-color: var(--navy); background: var(--navy); }
.primary-button:hover, .primary-button:focus-visible { border-color: var(--blue); background: var(--blue); }
.contact-inner > .primary-button { display: flex; margin: 0 auto; }

.links-section { padding: 100px 0 126px; background: var(--paper); }
.links-grid { display: grid; grid-template-columns: repeat(2, 1fr); column-gap: 80px; margin-top: 45px; border-top: 1px solid #d8dce4; }
.links-grid a { display: flex; justify-content: space-between; padding: 17px 3px; border-bottom: 1px solid #d8dce4; font-size: 14px; transition: color .2s ease, padding .2s ease; }
.links-grid a span { color: var(--blue); }
.links-grid a:hover, .links-grid a:focus-visible { padding-left: 10px; color: var(--blue); }

.footer-banners { display: grid; grid-template-columns: repeat(4, 1fr); }
.footer-banners a { position: relative; overflow: hidden; min-height: 176px; color: #fff; background: var(--navy); }
.footer-banners img { width: 100%; height: 100%; min-height: 176px; object-fit: cover; opacity: .74; transition: transform .5s ease, opacity .5s ease; }
.footer-banners a::after { position: absolute; inset: 0; background: linear-gradient(0deg, rgba(0,12,46,.85), transparent 75%); content: ""; }
.footer-banners a:hover img { opacity: .95; transform: scale(1.06); }
.footer-banners span { position: absolute; z-index: 1; bottom: 19px; left: 24px; font-family: var(--serif); font-size: 21px; letter-spacing: .05em; }
.site-footer { color: rgba(255,255,255,.75); background: var(--navy-deep); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 35px; min-height: 142px; }
.footer-brand img { width: 240px; }
.footer-copy p { margin: 0; font-size: 11px; line-height: 1.8; }
.footer-copy p + p { color: rgba(255,255,255,.45); }
.return-top { color: #fff; font-size: 10px; letter-spacing: .18em; white-space: nowrap; }
.return-top span { margin-left: 10px; color: var(--teal); font-size: 16px; }
.mobile-only { display: none; }

@media (max-width: 900px) {
  .page-width { width: min(100% - 44px, 680px); }
  .header-inner { min-height: 78px; padding: 0 22px; }
  .brand-mark-desktop { display: none; }
  .brand-mark-mobile { display: block; width: 185px; height: auto; }
  .menu-toggle { position: relative; z-index: 12; display: flex; flex-direction: column; gap: 5px; width: 36px; padding: 8px 0; cursor: pointer; }
  .menu-toggle > span:not(.sr-only) { display: block; width: 100%; height: 1px; background: #fff; transition: transform .25s ease, opacity .25s ease; }
  .menu-toggle[aria-expanded="true"] > span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] > span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] > span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
  .site-nav { position: absolute; top: 0; right: 0; left: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 92px 30px 22px; background: rgba(0,7,25,.97); }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 13px 0; border-bottom: 1px solid rgba(255,255,255,.16); }
  .site-nav a::after { display: none; }
  .hero { min-height: 680px; height: 88vh; }
  .hero-content { padding-top: 54px; }
  .hero h1 { font-size: clamp(34px, 8vw, 54px); }
  .hero-description { font-size: 14px; }
  .scroll-cue { left: 22px; }
  .hero-dots { right: 22px; }
  .notice-inner { justify-content: flex-start; gap: 14px; min-height: 72px; }
  .notice-inner p { font-size: 12px; line-height: 1.6; }
  .affiliation-grid { grid-template-columns: 1fr; gap: 0; padding-top: 20px; padding-bottom: 20px; }
  .affiliation-grid p, .affiliation-grid p:first-child { padding: 10px 0; border: 0; font-size: 12px; }
  .affiliation-grid p:first-child { font-size: 20px; }
  .section { padding: 84px 0; }
  .intro-grid, .research-feature, .method-grid { grid-template-columns: 1fr; gap: 45px; }
  .intro-copy { padding-top: 0; }
  .research-feature { margin-top: 48px; }
  .research-feature-copy { padding-right: 0; }
  .research-grid { grid-template-columns: repeat(2, 1fr); margin-top: 56px; }
  .method-visual { min-height: 300px; }
  .links-grid { grid-template-columns: 1fr; column-gap: 0; }
  .footer-banners { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { flex-wrap: wrap; padding-top: 30px; padding-bottom: 30px; }
  .footer-copy { order: 3; width: 100%; }
  .mobile-only { display: block; }
}

@media (max-width: 520px) {
  body { font-size: 15px; }
  .page-width { width: calc(100% - 36px); }
  .hero h1 { font-size: 35px; }
  .hero-description { max-width: 340px; font-size: 13px; }
  .outline-button { min-width: 200px; }
  .research-grid { grid-template-columns: 1fr; }
  .research-feature-image::before { top: 10px; right: -10px; bottom: -10px; left: 10px; }
  .method-visual-label { font-size: 27px; }
  .footer-banners a, .footer-banners img { min-height: 125px; }
  .footer-banners span { bottom: 12px; left: 14px; font-size: 17px; }
  .footer-brand img { width: 200px; }
  .return-top { font-size: 9px; }
}