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

html {
  background: #ffffff;
  color: #111111;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  font-size: 16px;
  line-height: 1.5;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #ffffff;
  color: #111111;
}

body,
button,
input,
textarea,
select {
  font: inherit;
}

a {
  color: #212529;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
}

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

a:focus-visible {
  border-radius: 0.15rem;
  outline: 3px solid rgba(13, 110, 253, 0.35);
  outline-offset: 3px;
}

img {
  display: block;
  height: auto;
  max-width: 100%;
}

p {
  margin: 0 0 1rem;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 10;
  padding: 0.55rem 0.8rem;
  background: #ffffff;
  border: 1px solid #dee2e6;
  border-radius: 0.25rem;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-shell {
  width: min(calc(100% - 2rem), 960px);
  margin: 0 auto;
  padding: 3rem 0 1rem;
}

.site-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-bottom: 1rem;
  margin-bottom: 3rem;
  border-bottom: 1px solid #dee2e6;
}

.site-brand {
  flex: 0 0 auto;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0 1rem;
  margin-left: auto;
}

.nav-link,
.language-switch {
  display: inline-block;
  padding: 0.5rem 0;
  text-decoration: none;
}

.nav-link.is-current {
  font-weight: 650;
  text-decoration: underline;
  text-underline-offset: 0.3em;
}

.language-switch {
  padding-left: 1rem;
  border-left: 1px solid #dee2e6;
  font-weight: 700;
}

.home-intro {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 3rem;
  align-items: start;
  margin-bottom: 3rem;
}

.home-heading {
  margin: 0 0 0.75rem;
  font-size: 1.75rem;
  line-height: 1.2;
}

.portrait {
  margin: 0;
}

.portrait img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.content-section {
  margin-bottom: 3rem;
}

.section-heading {
  margin: 0 0 3rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #dee2e6;
  font-size: 1.75rem;
  line-height: 1.2;
}

.publication-list {
  margin-top: 1.5rem;
}

.cv-entry h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
}

.cv-entry p {
  margin-bottom: 0;
}

.cv-section {
  display: grid;
  grid-template-columns: minmax(8rem, 2fr) minmax(0, 10fr);
  gap: 3rem;
  margin-bottom: 3rem;
}

.cv-section > h2,
.activity-section > h2 {
  margin: 0;
  font-size: 1.5rem;
  line-height: 1.35;
}

.cv-entry + .cv-entry {
  margin-top: 1.5rem;
}

.activity-section {
  margin-top: 2.5rem;
}

.activity-section > h2 {
  margin-bottom: 1.25rem;
}

.contact-card {
  font-style: normal;
}

.post-header .section-heading {
  margin-bottom: 0.75rem;
}

.post-date {
  margin-bottom: 2rem;
  color: #6c757d;
}

.site-footer {
  padding: 3rem 0 0;
  margin-top: 3rem;
  border-top: 1px solid #dee2e6;
  color: #6c757d;
  font-size: 0.875rem;
}

html[lang="zh-CN"] body {
  line-height: 1.75;
}

@media (max-width: 767px) {
  .site-shell {
    padding-top: 1.5rem;
  }

  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 2rem;
  }

  .site-nav {
    justify-content: flex-start;
    margin-left: 0;
    gap: 0 0.9rem;
  }

  .language-switch {
    padding-left: 0.9rem;
  }

  .home-intro {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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

  .cv-section {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}