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

:root {
  --tsinghua-purple: #82318e;
  --tsinghua-purple-dark: #5f2369;
  --tsinghua-purple-soft: #f6eef8;
  --first-author-highlight: #fff8d8;
  --first-author-highlight-border: #eedf9a;
}

html {
  min-height: 100%;
  background: #fff;
  color: #494e52;
  font-size: 15px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Trebuchet MS", Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

a {
  color: #224b8d;
  text-decoration: none;
}

a:hover,
a:focus {
  color: #163463;
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
  border: 0;
}

.masthead {
  width: 100%;
  background: #fff;
  border-bottom: 1px solid #f2f3f3;
}

.masthead__inner-wrap {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
}

.greedy-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 2rem;
  gap: 1rem;
}

.masthead__menu-home-item {
  color: #252a2e;
  font-size: 1.05rem;
  font-weight: 700;
  white-space: nowrap;
}

.visible-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.visible-links a {
  color: #494e52;
  font-size: 0.92rem;
}

#main {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 2.5rem;
  max-width: 1160px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3.5rem;
}

.sidebar {
  min-width: 0;
}

.sticky {
  position: sticky;
  top: 1.25rem;
  align-self: start;
}

.profile_box {
  color: #494e52;
}

.author__avatar {
  width: 170px;
  margin: 0 auto 1rem;
}

.author__avatar img {
  display: block;
  width: 170px;
  height: 170px;
  object-fit: cover;
  border: 1px solid #e6e8eb;
  border-radius: 6px;
}

.author__content {
  text-align: center;
}

.author__name {
  margin: 0.6rem 0 0.15rem;
  color: #252a2e;
  font-size: 1.35rem;
  line-height: 1.2;
}

.author__native-name {
  margin: 0 0 0.45rem;
  color: #6f777d;
  font-size: 0.95rem;
}

.author__bio {
  margin: 0 0 1rem;
  color: #5d646a;
  font-size: 0.95rem;
}

.author__urls {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.92rem;
}

.author__urls li {
  margin: 0.45rem 0;
  overflow-wrap: anywhere;
}

.author__urls .bio-note {
  margin-bottom: 1rem;
  color: #494e52;
}

.author__urls a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.author__urls img {
  width: 18px;
  height: 18px;
  object-fit: contain;
  border-radius: 3px;
}

.page {
  min-width: 0;
}

.page__inner-wrap {
  max-width: 840px;
}

.page__content {
  color: #494e52;
  font-size: 1rem;
}

.page__content p {
  margin: 0 0 0.7rem;
}

.page__content h2 {
  margin: 1.55rem 0 0.8rem;
  padding-bottom: 0.35rem;
  color: #252a2e;
  font-size: 1.35rem;
  line-height: 1.25;
  border-bottom: 1px solid #eceff1;
}

.anchor {
  display: block;
  position: relative;
  top: -1rem;
  visibility: hidden;
}

.news-list,
.education-list {
  margin: 0 0 1rem 1.2rem;
  padding: 0;
}

.news-list li,
.education-list li {
  margin: 0.35rem 0;
}

.paper-box {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 1.15rem;
  margin: 1.1rem 0 1.35rem;
  padding-bottom: 1.35rem;
  border-bottom: 1px solid #eef0f2;
}

.paper-box-highlight {
  margin-right: -0.75rem;
  margin-left: -0.75rem;
  padding: 0.85rem 0.75rem 1.35rem;
  border: 1px solid var(--first-author-highlight-border);
  border-radius: 6px;
  background: var(--first-author-highlight);
}

.paper-box-image {
  min-width: 0;
}

.paper-box-image > div {
  position: relative;
  border: 1px solid #e2e6e9;
  border-radius: 4px;
  background: #f7f8f9;
}

.paper-media {
  position: relative;
  overflow: hidden;
}

.paper-media > img.paper-image {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

.paper-media > video.paper-video {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease-in-out;
}

.paper-box:hover .paper-video,
.paper-box:focus-within .paper-video {
  opacity: 1;
}

.paper-box-text {
  min-width: 0;
  color: #494e52;
}

.paper-box-text p {
  margin: 0 0 0.55rem;
}

.paper-box-text strong {
  color: #252a2e;
}

.badge {
  position: absolute;
  top: 0.55rem;
  left: 0.55rem;
  z-index: 1;
  display: inline-block;
  padding: 0.16rem 0.46rem;
  border-radius: 3px;
  color: #fff;
  font-size: 0.76rem;
  font-weight: 700;
  line-height: 1.4;
  background: var(--tsinghua-purple);
}

.bg-danger {
  background: var(--tsinghua-purple);
}

.bg-muted {
  background: var(--tsinghua-purple-dark);
}

.page-footer {
  max-width: 1160px;
  margin: 0 auto;
  padding: 1rem 1.25rem 2rem;
  color: #777;
  font-size: 0.86rem;
  border-top: 1px solid #f2f3f3;
}

@media (max-width: 900px) {
  .greedy-nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.65rem;
  }

  .visible-links {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 0.8rem 1rem;
  }

  #main {
    grid-template-columns: 1fr;
    gap: 1.25rem;
    padding-top: 1.4rem;
  }

  .sticky {
    position: static;
  }

  .profile_box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.9rem;
    text-align: center;
  }

  .author__avatar {
    width: 110px;
    margin: 0;
  }

  .author__avatar img {
    width: 110px;
    height: 110px;
  }

  .author__content {
    text-align: center;
  }

  .author__urls-wrapper {
    width: 100%;
  }

  .author__urls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.35rem 0.9rem;
  }

  .author__urls li {
    margin: 0;
  }

  .author__urls .bio-note {
    flex-basis: 100%;
    margin-bottom: 0.25rem;
    text-align: center;
  }
}

@media (max-width: 620px) {
  html {
    font-size: 14px;
  }

  .masthead__inner-wrap,
  #main,
  .page-footer {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .paper-box {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
}

@media (hover: none) {
  .paper-video {
    opacity: 1;
  }
}