* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Noto Sans JP', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: #0f172a;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

body.menu-open {
  overflow: hidden;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1.75rem 1.5rem 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3;
  pointer-events: none;
}

.menu-toggle {
  position: absolute;
  left: 1.5rem;
  top: 1.75rem;
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 20px;
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
  color: #111827;
  pointer-events: auto;
}

.menu-toggle:focus-visible {
  outline: 2px solid #2563eb;
  outline-offset: 4px;
}

.menu-toggle .bar {
  height: 2px;
  width: 100%;
  background-color: currentColor;
  transition: transform 0.25s ease, opacity 0.25s ease, background-color 0.25s ease;
}

.menu-toggle.is-open .bar:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.menu-toggle.is-open .bar:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-open .bar:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

.menu-toggle.is-open .bar {
  background-color: #f8fafc;
}

.brand {
  pointer-events: auto;
}

.brand-logo {
  width: 140px;
  height: auto;
}

.about {
  padding: 8rem 1.5rem 4.5rem;
  max-width: 1080px;
  margin: 0 auto;
  display: grid;
  gap: 3.5rem;
}

.about-hero {
  text-align: center;
  display: grid;
  gap: 1.25rem;
}

.about-hero .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.75rem;
  color: #64748b;
  margin: 0;
}

.about-hero h1 {
  margin: 0;
  font-size: clamp(2.1rem, 6vw, 3rem);
  letter-spacing: 0.04em;
}

.about-hero .lead {
  margin: 0 auto;
  max-width: 48rem;
  line-height: 1.9;
  color: #475467;
}

.about-grid {
  display: grid;
  gap: 2rem;
}

.about-card {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 24px;
  padding: 2.25rem;
  box-shadow: 0 28px 60px rgba(15, 23, 42, 0.12);
}

.about-card h2 {
  margin: 0 0 1.25rem;
  font-size: 1.4rem;
}

.about-card p {
  margin: 0;
  line-height: 1.85;
  color: #475467;
}

.about-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin: 0 0 1.5rem;
  padding: 0;
}

.about-meta div {
  background: rgba(248, 250, 252, 0.65);
  border-radius: 18px;
  padding: 1rem 1.25rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.about-meta dt {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
  color: #94a3b8;
}

.about-meta dd {
  margin: 0;
  font-weight: 600;
  color: #0f172a;
}

.contact-card {
  display: grid;
  gap: 1rem;
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.contact-list a {
  color: #2563eb;
  text-decoration: none;
  font-weight: 600;
}

.contact-list a:hover,
.contact-list a:focus-visible {
  text-decoration: underline;
}

.highlight {
  display: grid;
  gap: 1rem;
}

.portrait-photo {
  width: 132px;
  height: 132px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 20px 56px rgba(99, 102, 241, 0.28);
  justify-self: center;
}

.highlight .intro {
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #6366f1;
  margin: 0;
}

.detail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  color: #475467;
}

.detail-list span {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #94a3b8;
  margin-bottom: 0.35rem;
}

.contact-link {
  justify-self: start;
  margin-top: 0.5rem;
  color: #2563eb;
  text-decoration: none;
  font-weight: 600;
}

.contact-link:hover,
.contact-link:focus-visible {
  text-decoration: underline;
}

.site-nav {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.94);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  z-index: 2;
}

.site-nav.open {
  display: flex;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  text-align: center;
}

.site-nav li + li {
  margin-top: 1.5rem;
}

.site-nav a {
  color: #f8fafc;
  text-decoration: none;
  font-size: 1.35rem;
  letter-spacing: 0.1em;
}

@media (min-width: 768px) {
  .about {
    padding: 9rem 2.5rem 6rem;
  }

  .site-header {
    padding: 2rem 2.5rem 0;
  }

  .menu-toggle {
    left: 2.5rem;
    top: 2rem;
    width: 28px;
    height: 22px;
  }

  .brand-logo {
    width: 160px;
  }

  .about-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .highlight {
    grid-template-columns: auto 1fr;
    align-items: start;
  }

  .highlight .portrait-photo {
    margin-right: 1rem;
    justify-self: start;
  }

  .highlight h2,
  .highlight .intro,
  .highlight p,
  .highlight .detail-list,
  .highlight .contact-link {
    grid-column: span 2;
  }
}

@media (min-width: 1024px) {
  .about-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2.5rem;
  }

  .about-card:first-child {
    grid-column: span 2;
  }

  .highlight {
    grid-column: span 3;
    grid-template-columns: auto 1fr;
  }

  .highlight .portrait-photo {
    align-self: start;
  }
}