html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: #222;
  background: #fff;
  font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

[hidden] {
  display: none !important;
}

a {
  color: #1a73b7;
  text-decoration: none;
}

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

img,
video {
  display: block;
  max-width: 100%;
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: #000;
  color: #fff;
  padding: 0.5rem 0.75rem;
}

.site-shell {
  width: min(100% - 2rem, 920px);
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid #e8e8e8;
}

.nav-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0;
}

.nav-toggle {
  padding: 0;
  border: 0;
  background: transparent;
  color: transparent;
  font: inherit;
  width: 0;
  min-width: 0;
  overflow: hidden;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
}

.site-nav a {
  color: #444;
  font-size: 0.95rem;
  font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

.page {
  padding: 1.5rem 0 3rem;
}

.hero {
  margin-bottom: 2.6rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 1.5rem;
  align-items: start;
}

h1 {
  margin: 0 0 0.9rem;
  font-size: 3rem;
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: #111;
  font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

h2 {
  margin: 0 0 1rem;
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.3;
  color: #111;
  font-family: "Roboto Slab", Georgia, serif;
}

h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  color: #111;
  font-family: "Roboto Slab", Georgia, serif;
}

p,
ul,
ol {
  margin-top: 0;
}

.hero-lead {
  margin-bottom: 0.9rem;
}

.hero-copy p {
  max-width: 760px;
}

.hero-side {
  margin-top: 3.25rem;
}

.profile-frame {
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border-radius: 6px;
}

.profile-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.timeline {
  margin: 1.1rem 0 1rem;
  padding-left: 1.2rem;
  font-size: 0.92rem;
  line-height: 1.55;
}

.keyword-line,
.contact-line,
.link-line {
  margin-top: 0.9rem;
}

.link-line {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.section {
  margin-top: 2.8rem;
}

.section-intro {
  margin-bottom: 1rem;
}

.research-list,
.simple-list {
  padding-left: 1.35rem;
}

.research-entry,
.simple-list li {
  margin-bottom: 1.5rem;
}

.research-showcase {
  margin-top: 1rem;
  padding: 1.25rem 1.4rem;
  border-radius: 2px;
  background: #1f1f1f;
  color: #f1f1f1;
}

.research-showcase .research-entry {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 1.6rem;
  align-items: start;
  margin-bottom: 1.7rem;
  padding-left: 0;
}

.research-showcase .research-entry:last-child {
  margin-bottom: 0;
}

.research-showcase .research-content h3 {
  margin-bottom: 0.45rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: #f3f3f3;
}

.research-showcase .research-content p {
  margin-bottom: 0.28rem;
  color: #d7d7d7;
}

.research-thumb {
  margin-top: 0.15rem;
}

.research-media {
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: 4px;
  background: #ffffff;
}

.research-media video,
.research-media img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  background: #ffffff;
}

.research-content {
  min-width: 0;
}

.research-meta-line {
  font-style: italic;
  color: #bfbfbf;
}

.research-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.55rem;
  align-items: flex-start;
}

.research-actions a,
.abs-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 74px;
  min-height: 30px;
  padding: 0 0.8rem;
  border: 1px solid #c6c6c6;
  color: #f3f3f3;
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  background: transparent;
  box-sizing: border-box;
  cursor: pointer;
}

.research-actions a:hover,
.research-actions a:focus-visible,
.abs-button:hover,
.abs-button:focus-visible {
  background: #2a2a2a;
  text-decoration: none;
}

.abs-button {
  color: #f3f3f3;
}

.abs-box {
  display: block;
  margin-top: 0.55rem;
  padding: 0.8rem 0.9rem;
  border: 1px dashed #bcbcbc;
  color: #dddddd;
  line-height: 1.65;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow-wrap: break-word;
}

.research-paper {
  margin-top: 0.5rem;
  color: #cfcfcf;
  font-size: 0.93rem;
  line-height: 1.55;
}

.simple-list p,
.cv-block li,
.research-content p {
  color: #333;
}

.project-period {
  margin-left: 0.65rem;
  font-weight: 400;
  color: #666;
  font-size: 0.96rem;
}

.cv-link {
  margin-bottom: 1rem;
}

.cv-block {
  margin-bottom: 1.6rem;
}

.site-footer {
  padding-bottom: 2.5rem;
  color: #666;
  font-size: 0.95rem;
}

.social-links {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.45rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  color: #444;
  font-size: 1.4rem;
  line-height: 1;
  text-decoration: none;
}

.social-link i {
  display: inline-block;
}

.social-link:hover,
.social-link:focus-visible {
  text-decoration: none;
  color: #111;
}

@media (max-width: 720px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-side {
    max-width: 220px;
  }

  .page {
    padding-top: 1rem;
  }

  h1 {
    font-size: 1.95rem;
  }

  h2 {
    font-size: 1.45rem;
  }

  .research-showcase .research-entry {
    grid-template-columns: 1fr;
    gap: 0.9rem;
  }

  .research-thumb {
    max-width: 190px;
  }
}