.content-section {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 4rem;
  margin-top: 10vh;
  padding-bottom: 6rem;
  align-items: start;
}

.content-section--subpage {
  margin-top: 4rem;
}

.subpage-sidebar {
  position: sticky;
  top: calc(var(--header-offset) + 3.5rem);
  align-self: start;
  background: #fff;
  border: 2px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.sidebar-image {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 5px;
  object-fit: cover;
  display: block;
}

.about-page {
  padding-top: 4rem;
  padding-bottom: 6rem;
}

.about-page .content {
  margin-inline: auto;
}

.about-image {
  width: 100%;
  max-width: 420px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 5px;
  display: block;
  margin: 0 auto 2.5rem;
}

.katakana-inline {
  display: inline-block;
  height: 1.1em;
  width: auto;
  margin-top: 0.25em;
}

.socials, .associations {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--icons-gap);
}

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


.associations > .social-link{
  height: calc((320px - 3 * var(--icons-gap)) / 4);   
  aspect-ratio: auto;
}

.social-link {
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-anchor);
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.social-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.social-link img {
  width: 60%;
  height: 60%;
  object-fit: contain;
}

.associations img {
  width: 80%;
  height: 80%;
  object-fit: contain;
}

.social-link.cv {
  font-size: 2rem;
  color: var(--cv-color);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.sidebar-info {
  display: contents;
}

.sidebar-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-l0);
  line-height: 1.2;
}

.sidebar-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  line-height: 1.35;
}

.sidebar-contact {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.sidebar-contact-row {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.875rem;
  line-height: 1.3;
  color: var(--text-l1);
}

.sidebar-contact-row img {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.sidebar-contact-row a {
  color: inherit;
  word-break: break-word;
}

.sidebar-contact-row a:hover {
  color: var(--primary);
}

.sidebar-socials {
  gap: 0.5rem;
}

.sidebar-socials .social-link.cv {
  font-size: 1.5rem;
}

.toc {
  position: sticky;
  top: calc(var(--header-offset) + 3.5rem);
  align-self: start;
  background: #fff;
  border: 2px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
  padding: 1.5rem;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toc-list a {
  display: block;
  font-size: 1.125rem;
  line-height: 1.5;
  color: var(--text-muted);
  transition: color 180ms ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toc-list a:hover {
  color: var(--text-l1);
}

.toc-list li.active a {
  color: var(--text-l1);
  font-weight: 500;
}

.toc-mobile-toggle {
  display: none;
}

.content {
  min-width: 0;
  max-width: 80ch;
}

.content > * + * {
  margin-top: 1rem;
}

.content h1 {
  font-size: 2rem;
  line-height: 1.2;
  font-weight: 600;
  color: var(--text-l0);
  margin-bottom: 1.5rem;
}

.content h2 {
  font-size: 1.25rem;
  line-height: 1.3;
  font-weight: 500;
  color: var(--text-l1);
  margin-top: 3rem;
}

.content h1 + h2,
.content h2:first-child {
  margin-top: 0;
}

.content h3 {
  font-size: 1rem;
  line-height: 1.3;
  font-weight: 500;
  color: var(--text-l1);
  margin-top: 1.5rem;
}

.content p {
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text-l1);
}

.content a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

.content a:hover {
  text-decoration-thickness: 2px;
}

.content ul {
  list-style: none;
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.content ul li {
  position: relative;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-l1);
  padding-left: 0.25rem;
}

.content ul li::before {
  content: '•';
  position: absolute;
  left: -1rem;
  top: 0;
  color: var(--text-l1);
  font-weight: 500;
}

.content ul.papers-list,
.content ul.talks-list {
  list-style: none;
  padding-left: 0;
  gap: 0;
}

.content ul.papers-list + ul.papers-list {
  margin-top: 3rem;
}

.content ul.papers-list li,
.content ul.talks-list li {
  padding: 1.25rem 0;
  padding-left: 0;
  border-bottom: 1px solid var(--border);
}

.content ul.papers-list li:last-child,
.content ul.talks-list li:last-child {
  border-bottom: none;
}

.content ul.papers-list li::before,
.content ul.talks-list li::before {
  content: none;
}

.content ul.papers-list li strong,
.content ul.talks-list li strong {
  font-weight: 500;
  color: var(--text-l0);
}

.social-link.contact-link {
  display: none;
}

@media (max-width: 1024px) {
  .content-section {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-top: 5rem;
  }

  .content-section--subpage {
    margin-top: 2rem;
    gap: 3rem;
  }

  .subpage-sidebar {
    position: static;
    top: auto;
    flex-direction: row;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
  }

  .sidebar-image {
    width: 64px;
    height: 64px;
  }

  .sidebar-subtitle {
    margin-top: 0.125rem;
  }

  .sidebar-contact {
    margin-left: 0.75rem;
    gap: 0.375rem;
  }

  .sidebar-contact-row span {
    white-space: nowrap;
  }

  .sidebar-socials {
    display: flex;
    margin-left: auto;
    gap: 0.5rem;
  }

  .sidebar-socials .social-link {
    width: 42px;
    height: 42px;
    flex-shrink: 0;
  }

  .toc {
    position: sticky;
    top: var(--header-offset);
    z-index: 50;
    padding: 0;
    border-radius: var(--radius-button);
    overflow: hidden;
  }

  .content-section .content {
    padding-left: 2px;
  }

  .toc-mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-l1);
    background: #fff;
    text-align: left;
  }

  .toc-mobile-toggle .chevron {
    width: 16px;
    height: 16px;
    transition: transform 220ms ease;
  }

  .toc.open .toc-mobile-toggle .chevron {
    transform: rotate(180deg);
  }

  .toc-list {
    max-height: 0;
    overflow: hidden;
    transition: max-height 280ms ease, padding 280ms ease;
    padding: 0 1.5rem;
    gap: 0.75rem;
    border-top: 0 solid var(--border);
  }

  .toc.open .toc-list {
    max-height: 60vh;
    overflow-y: auto;
    padding: 1rem 1.5rem 1.25rem;
    border-top: 1px solid var(--border);
  }
}

@media (max-width: 1024px) {
  html {
    scroll-padding-top: calc(var(--header-offset) + 4rem);
  }
}

@media (max-width: 900px) {
  .sidebar-socials .social-link:not(:first-child) {
    display: none;
  }
}

@media (max-width: 768px) {
  .content h2 {
    margin-top: 2.5rem;
  }
  .toc {
    top: calc(var(--header-offset) + 2px);
  }
}

@media (max-width: 690px) {
  .social-link {
    display: none;
  }
  .social-link.contact-link {
    display: flex !important;
  }

  .sidebar-contact {
    display: none;
  }
}

.br { display: none;}

@media screen and (max-width: 470px) {
  .br {
    display: block;
  }

  .subtitle-sep {
    display: none;
  }
}

@media screen and (max-width: 370px) {
  .subpage-sidebar {
    padding: 0;
    border: none;
    box-shadow: none;
  }
}