:root {
  --bg: #ffffff;
  --surface: #f7f9fc;
  --text: #1f2933;
  --muted: #6b7280;
  --accent: #1d4ed8;
  --border: #e5e7eb;
  font-size: 15px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  letter-spacing: 0.01em;
}

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

a:hover,
a:focus {
  color: var(--accent);
}

.container {
  width: min(860px, 92%);
  margin: 0 auto;
}

.section {
  padding: 2.4rem 0;
}

.surface {
  background: var(--surface);
}

.section + .section {
  border-top: 1px solid var(--border);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 0.6rem 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.9rem;
}

.section-header {
  margin-bottom: 2rem;
}

.section-header h3 {
  margin: 0;
  font-size: clamp(1.6rem, 2.6vw, 1.9rem);
}

h4 {
  margin: 0;
  font-size: clamp(1.1rem, 2.4vw, 1.3rem);
}

.section-header p {
  margin: 0.5rem 0 0;
  color: var(--muted);
}

.intro {
  padding-top: 3.2rem;
}

.intro-inner {
  display: grid;
  gap: 2rem;
}

.intro-name {
  margin: 0;
  font-size: clamp(2.05rem, 3.2vw, 2.45rem);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.intro-role {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.95rem;
}

.intro-summary {
  display: grid;
  gap: 1.1rem;
  font-size: 0.95rem;
}

.intro-summary p {
  margin: 0;
}

.contact-list {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.contact-list div {
  display: flex;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.contact-list dt {
  min-width: 7.5rem;
  color: var(--muted);
  font-weight: 500;
  margin: 0;
  font-size: 0.85rem;
}

.contact-list dd {
  margin: 0;
}

.column-title {
  margin: 2rem 0 1rem;
  font-size: 0.95rem;
}

.simple-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.65rem;
}

.simple-list li {
  display: flex;
  align-items: baseline;
  gap: 0.4rem 1rem;
  flex-wrap: wrap;
  font-size: 0.95rem;
}

.list-term {
  min-width: 5.8rem;
  font-weight: 600;
  color: var(--muted);
  font-size: 0.9rem;
}

.list-desc {
  flex: 1;
  min-width: 12rem;
  line-height: 1.5;
}

.publication-list {
  gap: 0.55rem;
}

.project-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1.1rem;
  font-size: 0.95rem;
}

.project-title {
  font-weight: 600;
  font-size: 1rem;
}

.project-list p {
  margin: 0.3rem 0 0.4rem;
  line-height: 1.5;
}

.project-link {
  font-weight: 500;
  color: var(--accent);
  font-size: 0.9rem;
}

.award-list {
  gap: 0.9rem;
}

.site-footer {
  padding: 0.5rem 0;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.7rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.7rem;
}

@media (max-width: 720px) {
  .contact-list div {
    flex-direction: column;
  }

  .simple-list li {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}