* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    -apple-system, BlinkMacSystemFont,
    "Segoe UI", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  color: #1e293b;
  background: #ffffff;
  line-height: 1.8;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.narrow {
  max-width: 820px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid #e5e7eb;
  backdrop-filter: blur(10px);
}

.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-title {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
}

.site-title a {
  font-weight: 800;
  font-size: 1.05rem;
}

.site-title span {
  font-size: 0.75rem;
  color: #64748b;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 24px;
  padding: 0;
  margin: 0;
  font-size: 0.9rem;
}

.nav-list a:hover {
  opacity: 0.6;
}

.hero {
  min-height: 620px;
  display: flex;
  align-items: center;
  background:
    linear-gradient(120deg, rgba(7, 33, 65, 0.96), rgba(13, 72, 99, 0.88)),
    linear-gradient(45deg, #0f172a, #164e63);
  color: white;
}

.hero-content {
  padding: 90px 0;
}

.eyebrow {
  margin: 0 0 18px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  opacity: 0.75;
}

.hero h1 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(2.4rem, 6vw, 4.8rem);
  line-height: 1.25;
  letter-spacing: -0.025em;
}

.hero-text {
  max-width: 760px;
  margin-top: 28px;
  font-size: 1.05rem;
  opacity: 0.88;
}

.hero-buttons {
  display: flex;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 6px;
  font-weight: 700;
}

.button.primary {
  background: white;
  color: #0f3551;
}

.button.secondary {
  border: 1px solid rgba(255,255,255,0.5);
  color: white;
}

.section {
  padding: 88px 0;
}

.section.alt {
  background: #f6f8fa;
}

.section-heading {
  margin-bottom: 40px;
}

.section-heading span {
  display: block;
  margin-bottom: 4px;
  color: #64748b;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.section-heading h2,
.intro h2 {
  margin: 0;
  font-size: 2rem;
}

.intro {
  text-align: center;
}

.intro p {
  font-size: 1.05rem;
  color: #475569;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: #fff;
  padding: 30px;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
}

.card-number {
  margin-bottom: 20px;
  color: #94a3b8;
  font-weight: 800;
}

.card h3 {
  margin-top: 0;
  font-size: 1.25rem;
}

.card p {
  margin-bottom: 0;
  color: #475569;
}

.member-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.member {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  align-items: start;
}

.photo-placeholder {
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  background: #e2e8f0;
  color: #94a3b8;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.member h3 {
  margin: 0 0 4px;
}

.role {
  margin: 0 0 12px;
  color: #64748b;
  font-size: 0.9rem;
}

.publication-list article {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid #dbe2ea;
}

.year {
  font-weight: 800;
}

.publication-list p {
  margin: 0;
}

.more-link {
  margin-top: 24px;
  font-weight: 700;
}

.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.two-column h3 {
  margin-top: 0;
}

.contact-box {
  padding: 28px;
  background: #f8fafc;
  border-left: 4px solid #0f4c5c;
}

footer {
  background: #0f172a;
  color: #cbd5e1;
}

.footer-inner {
  padding: 26px 0;
  font-size: 0.85rem;
}

@media (max-width: 820px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

  .nav-list {
    flex-wrap: wrap;
    gap: 10px 18px;
  }

  .hero {
    min-height: 540px;
  }

  .cards,
  .member-grid,
  .two-column {
    grid-template-columns: 1fr;
  }

  .member {
    grid-template-columns: 110px 1fr;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - 28px, 1120px);
  }

  .hero-content {
    padding: 70px 0;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: flex-start;
  }

  .section {
    padding: 64px 0;
  }

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

  .photo-placeholder {
    max-width: 180px;
  }

  .publication-list article {
    grid-template-columns: 1fr;
    gap: 0;
  }
}