.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition), backdrop-filter var(--transition);
}

.site-header.is-scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
  gap: 1rem;
}

.nav-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
}

.nav-brand-cn {
  font-family: var(--font-zh);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

.nav-brand:hover {
  color: var(--accent);
}

.nav-brand:hover .nav-brand-cn {
  color: inherit;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--accent);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 4rem;
  overflow: hidden;
}

.hero-wave {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.65;
}

.hero-wave svg {
  width: 100%;
  height: 100%;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-block: 4rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr minmax(220px, 340px);
  grid-template-areas: 'copy portrait';
  align-items: center;
  column-gap: clamp(2rem, 5vw, 4rem);
}

.hero-copy {
  grid-area: copy;
  min-width: 0;
  max-width: 40rem;
}

.hero-portrait {
  grid-area: portrait;
  margin: 0;
  justify-self: end;
}

.hero-portrait img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero-portrait img:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.hero-name {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.2em 0.45em;
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 6vw, 4.25rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 0.25rem;
}

.hero-name-en {
  letter-spacing: inherit;
}

.hero-name-rest {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45em;
  white-space: nowrap;
}

.hero-name-sep {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 0.38em;
  color: var(--text-muted);
  letter-spacing: 0;
  opacity: 0.55;
  user-select: none;
}

.hero-name-cn {
  font-family: var(--font-zh);
  font-size: 0.4em;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.14em;
  line-height: 1;
}

.hero-title {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.hero-affiliation {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.hero-tagline {
  max-width: 38rem;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  transition: color var(--transition), border-color var(--transition),
    background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.hero-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.hero-btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

[data-theme='dark'] .hero-btn--primary {
  color: #0f0f0f;
}

.hero-btn--primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
  box-shadow: var(--shadow-hover);
}

[data-theme='dark'] .hero-btn--primary:hover {
  color: #0f0f0f;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0 1.5rem;
  border-left: 1px solid var(--border);
}

.hero-stat:first-child {
  padding-left: 0;
  border-left: 0;
}

a.hero-stat {
  text-decoration: none;
  transition: transform var(--transition);
}

a.hero-stat:hover {
  transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
  a.hero-stat:hover {
    transform: none;
  }
}

a.hero-stat:hover .hero-stat-value {
  color: var(--accent);
}

.hero-stat-value {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text);
  transition: color var(--transition);
}

.hero-stat-label {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

section {
  padding-block: var(--section-gap);
}

.about {
  padding-top: clamp(4rem, 8vw, 9rem);
}

.about-content p {
  margin-bottom: 1.25rem;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.about-content p:last-child {
  margin-bottom: 0;
}

.about-education {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.education-label {
  display: block;
  margin-bottom: 1rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.education-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 0;
}

.edu-item {
  display: flex;
  padding: 0 1.5rem;
  border-left: 1px solid var(--border);
}

.edu-item:first-child {
  padding-left: 0;
  border-left: 0;
}

.edu-link {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  text-decoration: none;
  transition: color var(--transition);
}

.edu-school {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.25;
  white-space: nowrap;
  color: var(--text);
  transition: color var(--transition);
}

.edu-degree {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--text-muted);
}

.edu-link:hover .edu-school {
  color: var(--accent);
}

.site-footer {
  padding-block: 3rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.site-footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.75rem;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color var(--transition), transform var(--transition);
}

.footer-link:hover {
  color: var(--accent);
  transform: translateY(-1px);
}

.footer-icon {
  width: 1.05rem;
  height: 1.05rem;
  flex-shrink: 0;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.8;
}

@media (max-width: 768px) {
  .nav {
    height: 3.5rem;
  }

  .nav-links {
    position: fixed;
    top: 3.5rem;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 1rem 1rem;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition:
      transform var(--transition),
      opacity var(--transition),
      visibility var(--transition);
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-links a {
    padding: 0.75rem 0.5rem;
    font-size: 1rem;
    border-bottom: 1px solid var(--border);
  }

  .nav-links a:last-child {
    border-bottom: 0;
  }

  section {
    padding-block: 4rem;
  }

  .hero {
    min-height: auto;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    grid-template-areas:
      'portrait'
      'copy';
  }

  .hero-portrait {
    justify-self: center;
    max-width: 260px;
    width: 100%;
  }
}