:root {
  --ink: #101418;
  --muted: #5f6b72;
  --line: #dce6ea;
  --accent: #176f8f;
  --accent-dark: #0e5269;
  --paper: #fbfcfc;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.6;
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
}

a:hover,
a:focus {
  color: var(--accent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  padding: 22px clamp(24px, 6vw, 88px);
  border-bottom: 1px solid var(--line);
  background: rgba(251, 252, 252, 0.96);
}

.brand {
  color: var(--ink);
  font-size: 1.02rem;
  font-weight: 700;
  text-decoration: none;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: flex-end;
}

nav a {
  color: var(--muted);
  font-size: 0.95rem;
  text-decoration: none;
}

main {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, 360px);
  align-items: center;
  gap: clamp(32px, 5vw, 64px);
  padding: clamp(54px, 9vw, 112px) 0 clamp(40px, 7vw, 88px);
}

.chinese-name {
  margin: 0 0 18px;
  color: var(--accent-dark);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 600;
  letter-spacing: 0;
}

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

h1 {
  margin-bottom: 10px;
  font-size: clamp(3rem, 7vw, 5.7rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.subtitle {
  margin-bottom: 24px;
  color: var(--accent-dark);
  font-size: clamp(1.18rem, 2.2vw, 1.52rem);
}

.bio {
  max-width: 650px;
  color: #263238;
  font-size: 1.08rem;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin-top: 28px;
}

.links a {
  font-weight: 650;
}

.home-contact {
  width: min(100%, 380px);
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.home-contact p {
  margin-bottom: 3px;
  color: var(--muted);
  font-size: 0.92rem;
}

.home-contact a {
  font-size: 1.08rem;
  font-weight: 700;
}

.portrait {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center 35%;
  border: 1px solid var(--line);
  filter: brightness(1.18) contrast(0.94) saturate(0.9);
}

.fields,
.research,
.cv {
  padding: clamp(36px, 6vw, 70px) 0;
  border-top: 1px solid var(--line);
}

.area {
  scroll-margin-top: 96px;
}

h2 {
  margin-bottom: 30px;
  color: var(--accent-dark);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.12;
}

.fields ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.fields li {
  padding: 6px 0;
  color: #24323a;
  font-size: 1.05rem;
}

.fields li::after {
  content: "";
  display: block;
  width: 100%;
  height: 2px;
  margin-top: 5px;
  background: var(--line);
}

.paper {
  max-width: 1050px;
  margin-bottom: clamp(48px, 7vw, 78px);
}

.paper:last-child {
  margin-bottom: 0;
}

.paper h3 {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  margin-bottom: 22px;
  color: var(--accent-dark);
  font-size: clamp(1.45rem, 2.7vw, 2rem);
  font-style: italic;
  font-weight: 500;
  line-height: 1.35;
}

.paper-number {
  white-space: nowrap;
}

.paper-title {
  color: var(--accent-dark);
}

.paper-meta,
.status {
  color: var(--ink);
  font-size: clamp(1.02rem, 1.8vw, 1.3rem);
  font-style: normal;
}

.status {
  font-weight: 650;
}

.paper p {
  max-width: 1000px;
  margin-bottom: 20px;
  font-size: clamp(1.05rem, 2vw, 1.26rem);
  line-height: 1.55;
}

.presentations {
  color: var(--ink);
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  font-weight: 520;
}

.paper-links {
  margin-top: -4px;
}

.paper-links a {
  font-weight: 700;
}

footer {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  padding: 28px 0 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.95rem;
}

.cv-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 800px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.cv-panel p {
  margin-bottom: 4px;
  font-size: 1.08rem;
}

.cv-meta {
  color: var(--muted);
  font-size: 0.96rem !important;
}

.download {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 18px;
  border: 1px solid var(--accent-dark);
  color: var(--accent-dark);
  font-weight: 700;
  text-decoration: none;
}

.download:hover,
.download:focus {
  background: var(--accent-dark);
  color: #fff;
}

@media (max-width: 780px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    padding: 18px 24px;
  }

  nav {
    justify-content: flex-start;
  }

  main,
  footer {
    width: min(100% - 36px, 1120px);
  }

  .intro {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .portrait {
    max-width: 520px;
  }

  .paper h3 {
    display: block;
  }

  .paper h3 span {
    display: inline;
  }

  .paper-meta,
  .status {
    display: block;
    margin-top: 4px;
  }

  .cv-panel {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (min-width: 900px) {
  .subtitle {
    white-space: nowrap;
  }
}