:root {
  --site-blue-900: #142f4f;
  --site-blue-800: #1b426d;
  --site-blue-700: #285b8f;
  --site-blue-100: #dce7f1;
  --site-blue-050: #eef3f7;
  --site-gray-900: #252b31;
  --site-gray-700: #4c5661;
  --site-gray-500: #77818b;
  --site-gray-200: #d9dee3;
  --site-gray-100: #edf0f2;
  --site-white: #ffffff;
}

html[lang="ja"] {
  --site-japanese-font: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", "Noto Sans JP", sans-serif;
  --bs-body-font-family: var(--site-japanese-font);
  --bs-font-sans-serif: var(--site-japanese-font);
}

body {
  color: var(--site-gray-900);
  background: #f7f8f9;
}

html[lang="ja"] body {
  font-family: var(--site-japanese-font);
}

html[lang="ja"] #quarto-content,
html[lang="ja"] #quarto-content :is(h1, h2, h3, h4, h5, h6, p, li, a, span, strong, em) {
  font-family: var(--site-japanese-font);
}

a {
  color: var(--site-blue-700);
}

.navbar {
  min-height: 4.5rem;
  background: var(--site-blue-900);
  border-bottom: 1px solid rgba(255, 255, 255, 0.13);
  box-shadow: 0 0.25rem 1.5rem rgba(20, 47, 79, 0.13);
}

.navbar .navbar-brand,
.navbar .nav-link,
.navbar .quarto-navigation-tool {
  color: rgba(255, 255, 255, 0.88) !important;
}

.navbar .navbar-brand {
  font-size: 1.1rem;
  font-weight: 650;
  letter-spacing: 0.01em;
}

.navbar .nav-link {
  position: relative;
  font-weight: 500;
}

.navbar .nav-link:hover,
.navbar .nav-link.active {
  color: var(--site-white) !important;
}

.navbar .nav-link.active::after {
  position: absolute;
  right: 0.75rem;
  bottom: 0.15rem;
  left: 0.75rem;
  height: 2px;
  content: "";
  background: #9fc3e4;
}

.home-page {
  grid-column: screen-start / screen-end !important;
  width: 100%;
  margin-top: -1rem;
}

.home-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  color: var(--site-white);
  background:
    radial-gradient(circle at 78% 48%, rgba(180, 208, 232, 0.2) 0 9%, transparent 9.3% 17%, rgba(180, 208, 232, 0.1) 17.3% 17.8%, transparent 18.1%),
    linear-gradient(118deg, var(--site-blue-900) 0%, var(--site-blue-800) 58%, #4c657c 100%);
}

.home-hero::after {
  position: absolute;
  z-index: -1;
  top: -35%;
  right: 6%;
  width: 28rem;
  height: 28rem;
  content: "";
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 50%;
  box-shadow:
    0 0 0 4rem rgba(255, 255, 255, 0.025),
    0 0 0 8rem rgba(255, 255, 255, 0.02);
}

.home-hero__inner,
.home-profile__inner,
.home-topics__inner {
  width: min(1120px, calc(100% - 3rem));
  margin-inline: auto;
}

.home-hero__inner {
  padding: clamp(5rem, 10vw, 8.5rem) 0 clamp(5.5rem, 11vw, 9rem);
}

.home-hero__eyebrow,
.section-label {
  margin: 0 0 1rem;
  color: #b7d2e9;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.17em;
}

.home-hero h1 {
  max-width: 900px;
  margin: 0;
  color: var(--site-white);
  border: 0;
  font-size: clamp(2.6rem, 7vw, 5.5rem);
  font-weight: 750;
  line-height: 1.03;
  letter-spacing: -0.045em;
}

.home-hero__name {
  margin: 1.6rem 0 0;
  color: var(--site-white);
  font-size: clamp(1.8rem, 4.5vw, 3.5rem);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.home-hero__role {
  margin: 1.2rem 0 0;
  color: #d7e4ef;
  font-size: clamp(1rem, 2vw, 1.2rem);
  letter-spacing: 0.035em;
}

.home-profile {
  color: #f5f7f9;
  background: var(--site-gray-900);
}

.home-profile__inner {
  display: grid;
  grid-template-columns: minmax(230px, 330px) minmax(0, 1fr);
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: center;
  padding-block: clamp(4rem, 8vw, 7rem);
}

.profile-photo-placeholder {
  display: grid;
  min-height: 410px;
  padding: 2rem;
  place-content: center;
  text-align: center;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.015)),
    var(--site-gray-700);
  border: 1px dashed rgba(255, 255, 255, 0.38);
  border-radius: 0.3rem;
}

.profile-photo {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center;
  background: var(--site-gray-700);
  border-radius: 0.3rem;
}

.profile-photo-placeholder__initials {
  display: grid;
  width: 6.5rem;
  height: 6.5rem;
  margin: 0 auto 1.5rem;
  color: var(--site-blue-900);
  background: var(--site-blue-100);
  border-radius: 50%;
  place-items: center;
  font-size: 1.7rem;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.profile-photo-placeholder__title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
}

.profile-photo-placeholder__note {
  margin: 0.6rem 0 0;
  color: #cbd1d7;
  font-size: 0.9rem;
}

.profile-introduction .section-label,
.home-topics .section-label {
  color: #8db5d8;
}

.profile-introduction h2,
.home-topics h2 {
  margin: 0 0 1.5rem;
  border: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.profile-introduction h2 {
  color: var(--site-white);
}

.profile-introduction > p:not(.section-label) {
  max-width: 45rem;
  color: #dce1e5;
  font-size: 1.02rem;
  line-height: 1.95;
}

.profile-introduction a:not(.profile-action) {
  color: #b6d4ed;
}

.profile-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.profile-action {
  display: inline-block;
  padding: 0.78rem 1.2rem;
  border-radius: 0.2rem;
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform 150ms ease, background-color 150ms ease;
}

.profile-action:hover {
  transform: translateY(-2px);
}

.profile-action--primary {
  color: var(--site-blue-900);
  background: #b7d2e9;
}

.profile-action--primary:hover {
  color: var(--site-blue-900);
  background: #cce0f0;
}

.profile-action--secondary {
  color: var(--site-white);
  border: 1px solid rgba(255, 255, 255, 0.42);
}

.profile-action--secondary:hover {
  color: var(--site-white);
  background: rgba(255, 255, 255, 0.08);
}

.home-topics {
  background: var(--site-blue-050);
}

.home-topics__inner {
  padding-block: clamp(4rem, 8vw, 7rem);
}

.home-topics h2 {
  color: var(--site-blue-900);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.topic-card {
  min-height: 16rem;
  padding: 2rem;
  background: var(--site-white);
  border-top: 4px solid var(--site-blue-700);
  box-shadow: 0 0.7rem 2rem rgba(20, 47, 79, 0.08);
}

.topic-card__number {
  color: #8a949e;
  font-size: 0.75rem;
  font-weight: 750;
  letter-spacing: 0.14em;
}

.topic-card h3 {
  margin: 2.8rem 0 0.9rem;
  color: var(--site-blue-900);
  font-size: 1.35rem;
}

.topic-card p {
  color: var(--site-gray-700);
  line-height: 1.75;
}

.research-page {
  --research-accent: #b54b32;
  max-width: 920px;
}

.research-page--dust {
  --research-accent: #80608f;
}

.research-project-divider {
  max-width: 920px;
  margin: clamp(5rem, 10vw, 8rem) 0 clamp(4rem, 8vw, 6rem);
  border: 0;
  border-top: 1px solid var(--site-gray-200);
}

.research-kicker {
  margin: 0 0 0.7rem;
  color: var(--site-blue-700);
  font-size: 0.76rem;
  font-weight: 750;
  letter-spacing: 0.15em;
}

.research-page > h2 {
  margin-top: 0;
  color: var(--site-blue-900);
  border-bottom: 0;
  font-size: clamp(2rem, 5vw, 3.4rem);
  letter-spacing: -0.04em;
}

.research-page > h3 {
  margin-top: 4rem;
  color: var(--site-blue-900);
  border-bottom: 1px solid var(--site-gray-200);
  font-size: clamp(1.35rem, 3vw, 1.8rem);
}

.research-lead {
  max-width: 48rem;
  margin: 1.2rem 0 1.6rem;
  color: var(--site-blue-800);
  font-size: clamp(1.08rem, 2.2vw, 1.28rem);
  font-weight: 600;
  line-height: 1.8;
}

.research-page > p:not(.research-kicker, .research-lead, .research-source) {
  line-height: 2;
}

.research-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 2.5rem 0 0;
  border-block: 1px solid var(--site-gray-200);
}

.research-fact {
  padding: 1.35rem 1.4rem 1.5rem;
  color: var(--site-gray-700);
  font-size: 0.93rem;
  line-height: 1.65;
}

.research-fact + .research-fact {
  border-left: 1px solid var(--site-gray-200);
}

.research-fact p {
  margin: 0;
}

.research-fact__label {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--research-accent);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.research-figure {
  overflow: hidden;
  margin: 1.25rem 0 0;
  background: var(--site-white);
  border: 1px solid var(--site-gray-200);
  box-shadow: 0 0.8rem 2.5rem rgba(20, 47, 79, 0.09);
}

.research-figure p {
  margin: 0;
}

.research-figure img {
  display: block;
  width: 100%;
  margin: 0;
  border: 0;
}

.research-figure__caption {
  padding: 1.15rem 1.35rem 1.3rem;
  color: var(--site-gray-700);
  font-size: 0.92rem;
  line-height: 1.7;
}

.research-figure__caption span {
  margin-right: 0.7rem;
  color: var(--research-accent);
  font-size: 0.75rem;
  font-weight: 750;
  letter-spacing: 0.12em;
}

.research-takeaway {
  margin: 4rem 0 1.2rem;
  padding: 1.7rem 1.9rem;
  background: var(--site-blue-050);
  border-left: 4px solid var(--site-blue-700);
}

.research-takeaway h4 {
  margin: 0 0 0.7rem;
  color: var(--site-blue-900);
}

.research-takeaway p {
  margin: 0;
  color: var(--site-gray-700);
  line-height: 1.8;
}

.research-source {
  color: var(--site-gray-500);
  font-size: 0.78rem;
  line-height: 1.6;
}

.nav-footer {
  color: #cfd7df;
  background: #10263f;
}

@media (max-width: 767.98px) {
  .navbar .nav-link.active::after {
    display: none;
  }

  .home-hero__inner,
  .home-profile__inner,
  .home-topics__inner {
    width: min(100% - 2rem, 680px);
  }

  .home-profile__inner {
    grid-template-columns: 1fr;
  }

  .profile-photo-placeholder {
    min-height: 350px;
  }

  .topic-grid {
    grid-template-columns: 1fr;
  }

  .research-facts {
    grid-template-columns: 1fr;
  }

  .research-fact + .research-fact {
    border-top: 1px solid var(--site-gray-200);
    border-left: 0;
  }

  .topic-card {
    min-height: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .profile-action {
    transition: none;
  }
}