:root {
  --bg: #f7f8f8;
  --surface: #ffffff;
  --surface-soft: #eef4f2;
  --text: #17201d;
  --muted: #5b6661;
  --line: #dbe3df;
  --accent: #00756a;
  --accent-strong: #005a52;
  --warm: #b36b20;
  --shadow: 0 18px 45px rgba(24, 40, 35, 0.08);
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

a {
  color: var(--accent-strong);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
  padding: 0 max(24px, calc((100vw - var(--max-width)) / 2));
  background: rgba(247, 248, 248, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  color: var(--text);
  font-weight: 700;
  white-space: nowrap;
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px 18px;
  font-size: 14px;
}

.nav a {
  color: var(--muted);
}

.language-toggle {
  min-width: 52px;
  min-height: 34px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--accent-strong);
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}

.language-toggle:hover {
  border-color: var(--accent);
}

main {
  width: min(var(--max-width), calc(100% - 40px));
  margin: 0 auto;
}

.profile-section {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 42px;
  align-items: center;
  padding: 42px 0 52px;
}

.profile-media {
  width: 100%;
  max-width: 250px;
  aspect-ratio: 1;
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.profile-media img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.eyebrow,
.section-kicker {
  margin: 0 0 8px;
  color: var(--warm);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.eyebrow:empty,
.title-line:empty {
  display: none;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(42px, 5.2vw, 64px);
  line-height: 1;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.35;
  letter-spacing: 0;
}

.title-line {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.bio {
  max-width: 760px;
  margin: 20px 0 0;
  font-size: 16px;
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 14px;
}

.profile-actions,
.contact-links,
.publication-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.profile-actions {
  margin-top: 24px;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 7px 13px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: var(--accent);
  color: #ffffff;
  font-size: 14px;
  font-weight: 650;
}

.button-link.secondary {
  background: transparent;
  color: var(--accent-strong);
}

.button-link:hover {
  text-decoration: none;
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: #ffffff;
}

.content-section,
.contact-section {
  padding: 52px 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  margin-bottom: 28px;
}

.timeline {
  display: grid;
  gap: 16px;
}

.timeline-item,
.publication-item,
.award-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 8px 24px rgba(24, 40, 35, 0.045);
}

.timeline-item {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 24px;
  padding: 22px;
}

.timeline.compact .timeline-item {
  grid-template-columns: 120px minmax(0, 1fr);
  padding: 18px 20px;
}

.item-date {
  color: var(--warm);
  font-size: 14px;
  font-weight: 700;
}

.item-meta,
.publication-meta {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.item-description,
.publication-abstract {
  margin: 12px 0 0;
  color: var(--muted);
}

.publication-list {
  display: grid;
  gap: 18px;
}

.publication-group + .publication-group {
  margin-top: 34px;
}

.subsection-title {
  margin-bottom: 14px;
  color: var(--text);
  font-size: 20px;
}

.publication-item {
  padding: 24px;
}

.publication-authors {
  margin: 8px 0 0;
  color: var(--muted);
}

.publication-authors strong {
  color: var(--text);
  font-weight: 800;
}

.publication-links {
  margin-top: 16px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  color: var(--accent-strong);
  font-size: 14px;
  font-weight: 700;
}

.award-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.award-item {
  padding: 20px;
}

.award-year {
  color: var(--warm);
  font-size: 14px;
  font-weight: 700;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  gap: 40px;
  align-items: start;
}

.contact-section p {
  max-width: 620px;
  margin: 12px 0 0;
  color: var(--muted);
}

.contact-links {
  justify-content: flex-start;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  width: min(var(--max-width), calc(100% - 40px));
  margin: 0 auto;
  padding: 26px 0 34px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 820px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 20px;
  }

  .header-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
    width: 100%;
  }

  .nav {
    justify-content: flex-start;
  }

  main,
  .site-footer {
    width: min(100% - 28px, var(--max-width));
  }

  .profile-section {
    grid-template-columns: 1fr;
    gap: 28px;
    min-height: auto;
    padding: 32px 0 42px;
  }

  .profile-media {
    width: min(220px, 70vw);
  }

  .section-heading,
  .timeline-item,
  .timeline.compact .timeline-item,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .award-grid {
    grid-template-columns: 1fr;
  }

  .content-section,
  .contact-section {
    padding: 48px 0;
  }

  .site-footer {
    flex-direction: column;
  }
}