:root {
  --ink: #17202a;
  --muted: #5c6672;
  --line: #d9e0e7;
  --paper: #ffffff;
  --soft: #f5f7f8;
  --blue: #0a6f9e;
  --teal: #0e8b84;
  --red: #b14b3b;
  --green: #3f7f54;
  --violet: #695a9f;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

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

a:hover {
  text-decoration: underline;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--green));
  font-weight: 800;
  letter-spacing: 0;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.site-nav a {
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--ink);
  background: var(--soft);
  text-decoration: none;
}

.language-toggle {
  min-width: 54px;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--paper);
  font: inherit;
  font-size: 14px;
  font-weight: 750;
  cursor: pointer;
}

.language-toggle:hover,
.language-toggle:focus-visible {
  background: var(--soft);
}

body.is-zh {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

body.is-zh .eyebrow,
body.is-zh .focus-index,
body.is-zh .year,
body.is-zh .timeline time {
  letter-spacing: 0;
}


.hero,
.page-hero,
.section,
.people-section,
.timeline,
.join-grid,
.research-list,
.research-map {
  width: min(var(--max), calc(100vw - 40px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  gap: 48px;
  align-items: center;
  padding: 64px 0 52px;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(42px, 6vw, 78px);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero-copy {
  min-width: 0;
}

.lead {
  max-width: 760px;
  color: var(--muted);
  font-size: 19px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  font-weight: 750;
}

.button.primary {
  color: #fff;
  background: var(--ink);
}

.button.secondary {
  color: var(--ink);
  background: var(--soft);
}

.button:hover {
  text-decoration: none;
}

.hero-visual,
.research-map {
  margin: 0;
}

.hero-visual img,
.research-map img,
.research-entry img {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 16px 42px rgba(23, 32, 42, 0.08);
}

.section {
  padding: 56px 0;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 28px;
}

.section-heading h2,
.split-band h2,
.page-hero h1,
.research-entry h2,
.publication-item h2,
.person-feature h2,
.join-grid h2,
.timeline h2 {
  margin-top: 0;
}

.section-heading h2 {
  max-width: 620px;
  font-size: 38px;
  line-height: 1.12;
}

.focus-grid,
.member-grid,
.join-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.focus-item,
.member-grid article,
.join-grid article,
.publication-item,
.timeline article {
  border-top: 3px solid var(--line);
  padding: 22px 0 0;
}

.focus-index,
.year,
.timeline time {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.focus-item h3,
.member-grid h3 {
  margin: 10px 0 8px;
}

.focus-item p,
.member-grid p,
.publication-item p,
.timeline p,
.join-grid p {
  color: var(--muted);
}

.split-band {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-hero {
  padding: 64px 0 32px;
}

.page-hero.compact {
  max-width: 900px;
}

.research-map {
  padding: 10px 0 48px;
}

.research-list {
  display: grid;
  gap: 42px;
  padding: 0 0 70px;
}

.research-entry {
  display: grid;
  grid-template-columns: minmax(340px, 0.9fr) minmax(0, 1fr);
  gap: 34px;
  align-items: center;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.tag-list li {
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: var(--soft);
  font-size: 13px;
  font-weight: 650;
}

.publication-list {
  display: grid;
  gap: 28px;
}

.publication-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
}

.people-section {
  padding: 16px 0 70px;
}

.person-feature {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 26px;
  align-items: center;
  margin-bottom: 42px;
  padding: 30px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.avatar-placeholder {
  display: grid;
  width: 104px;
  height: 104px;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--red), var(--violet));
  font-size: 28px;
  font-weight: 850;
}

.member-grid {
  grid-template-columns: repeat(3, 1fr);
}

.timeline {
  display: grid;
  gap: 28px;
  padding: 20px 0 70px;
}

.join-grid {
  grid-template-columns: repeat(3, 1fr);
  padding: 16px 0 70px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px max(24px, calc((100vw - var(--max)) / 2));
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 900px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .hero,
  .split-band,
  .research-entry,
  .publication-item,
  .person-feature {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 44px;
  }

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

@media (max-width: 620px) {
  .hero,
  .page-hero,
  .section,
  .people-section,
  .timeline,
  .join-grid,
  .research-list,
  .research-map {
    width: min(100% - 28px, var(--max));
  }

  .hero h1,
  .page-hero h1 {
    font-size: 40px;
  }

  .focus-grid,
  .member-grid,
  .join-grid {
    grid-template-columns: 1fr;
  }

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