:root {
  --ink: #102326;
  --muted: #5a6b6d;
  --paper: #f8fbfa;
  --white: #ffffff;
  --teal: #0a6f7b;
  --teal-dark: #064d58;
  --sea: #d6f0ec;
  --gold: #b9892d;
  --coral: #d35f4b;
  --line: #dbe7e5;
  --shadow: 0 22px 70px rgba(8, 45, 49, 0.13);
  font-family: Inter, "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(214, 240, 236, 0.88), rgba(248, 251, 250, 0.45) 38%, rgba(250, 245, 234, 0.72)),
    var(--paper);
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 28px;
  align-items: center;
  padding: 18px clamp(20px, 5vw, 70px);
  border-bottom: 1px solid rgba(219, 231, 229, 0.84);
  background: rgba(248, 251, 250, 0.92);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 180px;
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 50%;
  color: var(--white);
  background: linear-gradient(145deg, var(--teal), var(--coral));
  font-weight: 800;
  letter-spacing: 0;
}

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

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.nav-links {
  display: flex;
  justify-content: center;
  gap: clamp(16px, 3vw, 36px);
  color: var(--muted);
  font-size: 15px;
}

.nav-links a {
  border-bottom: 2px solid transparent;
  padding-bottom: 4px;
}

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

.language-toggle {
  width: 46px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--teal-dark);
  background: var(--white);
  font-weight: 700;
  cursor: pointer;
}

main {
  overflow: hidden;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 400px);
  gap: clamp(30px, 6vw, 90px);
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(60px, 8vw, 118px) clamp(20px, 5vw, 40px) 36px;
}

.eyebrow,
.section-kicker,
.panel-label {
  margin: 0 0 12px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  display: grid;
  gap: 4px;
  margin-bottom: 14px;
  font-size: clamp(52px, 7vw, 92px);
  line-height: 0.95;
  letter-spacing: 0;
}

h1 span + span {
  color: var(--teal-dark);
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 650;
}

.role {
  margin-bottom: 22px;
  color: var(--gold);
  font-size: clamp(20px, 2.4vw, 30px);
  font-weight: 800;
}

.intro {
  max-width: 720px;
  color: #29494d;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0 18px;
  color: var(--teal-dark);
  background: rgba(255, 255, 255, 0.76);
  font-weight: 800;
}

.button.primary {
  border-color: var(--teal);
  color: var(--white);
  background: var(--teal);
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(8, 45, 49, 0.12);
}

.profile-panel {
  display: grid;
  gap: 22px;
  align-self: stretch;
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 8px;
  padding: 22px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.72));
  box-shadow: var(--shadow);
}

.portrait {
  width: 100%;
  min-height: 300px;
  max-height: 470px;
  border-radius: 8px;
  object-fit: cover;
  object-position: center top;
  background: var(--white);
}

.panel-title {
  margin: 0;
  color: #274447;
  font-size: 20px;
  font-weight: 750;
  line-height: 1.5;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 40px);
}

.metrics article {
  display: grid;
  gap: 8px;
  min-height: 138px;
  align-content: center;
  padding: 22px;
  background: rgba(255, 255, 255, 0.76);
  border-top: 4px solid var(--sea);
}

.metrics article:nth-child(2) {
  border-color: #f1d6a6;
}

.metrics article:nth-child(3) {
  border-color: #fac8bd;
}

.metrics article:nth-child(4) {
  border-color: #c6d5f1;
}

.metrics strong {
  color: var(--teal-dark);
  font-size: clamp(34px, 4vw, 54px);
  line-height: 1;
}

.metrics span {
  color: var(--muted);
  font-weight: 700;
}

.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(58px, 8vw, 96px) clamp(20px, 5vw, 40px);
}

.two-column {
  display: grid;
  grid-template-columns: minmax(200px, 320px) minmax(0, 1fr);
  gap: clamp(28px, 7vw, 92px);
}

h2 {
  margin-bottom: 0;
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1.12;
  letter-spacing: 0;
}

.body-copy {
  color: #2e484b;
  font-size: 18px;
  line-height: 1.9;
}

.body-copy p:last-child {
  margin-bottom: 0;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.research-card {
  min-height: 260px;
  border: 1px solid rgba(219, 231, 229, 0.9);
  border-radius: 8px;
  padding: 26px;
  background: rgba(255, 255, 255, 0.82);
}

.research-card span {
  display: inline-flex;
  margin-bottom: 38px;
  color: var(--coral);
  font-weight: 850;
}

.research-card h3 {
  margin-bottom: 12px;
  font-size: 23px;
  letter-spacing: 0;
}

.research-card p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.75;
}

.publications-heading {
  align-items: center;
}

.text-link {
  border-bottom: 2px solid var(--teal);
  color: var(--teal-dark);
  font-weight: 800;
  white-space: nowrap;
}

.publication-list {
  display: grid;
  border-top: 1px solid var(--line);
}

.publication {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.publication time {
  color: var(--coral);
  font-size: 18px;
  font-weight: 850;
}

.publication h3 {
  margin-bottom: 8px;
  font-size: clamp(20px, 2vw, 25px);
  line-height: 1.35;
}

.publication p {
  margin-bottom: 0;
  color: var(--muted);
  font-weight: 650;
}

.source-section {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(280px, 1fr);
  gap: clamp(26px, 5vw, 64px);
  align-items: center;
}

.source-copy p:last-child {
  color: #2f4f52;
  font-size: 18px;
  line-height: 1.8;
}

.source-card {
  margin: 0;
}

.source-card img {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 18px 44px rgba(8, 45, 49, 0.12);
}

.source-card figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(200px, 330px) minmax(0, 1fr);
  gap: clamp(28px, 6vw, 80px);
  padding-bottom: 76px;
}

.contact-grid {
  display: grid;
  gap: 12px;
}

.contact-grid a {
  display: grid;
  gap: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.82);
}

.contact-grid a:hover {
  border-color: var(--teal);
}

.contact-grid span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.contact-grid strong {
  overflow-wrap: anywhere;
  color: var(--teal-dark);
  font-size: 18px;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 26px clamp(20px, 5vw, 70px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.7);
}

footer p {
  margin-bottom: 0;
}

footer a {
  color: var(--teal-dark);
  font-weight: 800;
}

@media (max-width: 860px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav-links {
    display: none;
  }

  .hero,
  .two-column,
  .source-section,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .profile-panel {
    max-width: 460px;
  }

  .metrics,
  .research-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .site-header {
    padding: 14px 18px;
  }

  .brand {
    min-width: 0;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
  }

  .hero {
    padding-top: 46px;
  }

  h1 {
    font-size: 48px;
  }

  h1 span + span {
    font-size: 29px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .metrics,
  .research-grid {
    grid-template-columns: 1fr;
  }

  .metrics article {
    min-height: 112px;
  }

  .section-heading,
  footer {
    display: grid;
  }

  .publication {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}