:root {
  --bg: #ffffff;
  --ink: #161c23;
  --muted: #4f5a67;
  --accent: #4b88c7;
  --accent-deep: #316fa9;
  --line: #d4e0ef;
  --max-width: 1120px;
  --font-sans: "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Montserrat", "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-zh: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-padding-top: 88px;
}

body {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  margin: 0;
  color: var(--ink);
  font-family: var(--font-sans);
  background: var(--bg);
  line-height: 1.66;
}

main {
  flex: 1;
}

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

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

.container {
  width: min(var(--max-width), 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
}

.mobile-menu-toggle,
.mobile-nav {
  display: none;
}

.mobile-menu-toggle {
  width: 42px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(75, 136, 199, 0.26);
  border-radius: 999px;
  background: #f3f7fc;
  color: var(--accent-deep);
  cursor: pointer;
  font: inherit;
  font-size: 1.15rem;
  line-height: 1;
}

.mobile-menu-toggle:hover,
.mobile-menu-toggle:focus-visible {
  border-color: rgba(75, 136, 199, 0.44);
  box-shadow: 0 6px 14px rgba(75, 136, 199, 0.14);
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--accent-deep);
  transition: color 0.2s ease;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.94rem;
}

.nav-links a {
  color: var(--accent-deep);
  position: relative;
  padding: 7px 10px;
  border-radius: 999px;
  font-weight: 500;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-links a::after {
  display: none;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--accent-deep);
  background: #f3f7fc;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 15px;
  border-radius: 999px;
  border: 1px solid rgba(75, 136, 199, 0.26);
  background: #f3f7fc;
  color: var(--accent-deep);
  font-size: 0.88rem;
  font-family: inherit;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: rgba(75, 136, 199, 0.44);
  box-shadow: 0 8px 18px rgba(75, 136, 199, 0.16);
}

.join-btn {
  white-space: nowrap;
}

.hero {
  padding: 72px 0 36px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 300px);
  grid-template-areas:
    "identity card"
    "about card";
  column-gap: 38px;
  row-gap: 16px;
  align-items: start;
}

.hero-identity {
  grid-area: identity;
  max-width: 72ch;
}

.hero-name {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(2.45rem, 4.7vw, 4rem);
  line-height: 1.1;
  color: #172235;
}

.name-zh {
  display: inline;
  margin-left: 0.16em;
  font-family: var(--font-zh);
  font-size: 0.43em;
  font-weight: 450;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--muted);
  white-space: nowrap;
}

.hero-about {
  grid-area: about;
  max-width: 72ch;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.hero-about-text {
  margin: 0 0 10px;
  color: var(--muted);
  line-height: 1.73;
  hyphens: none;
  text-align: left;
  text-wrap: pretty;
}

.hero-about .inline-link {
  white-space: nowrap;
}

.hero-note {
  margin: 0;
  color: #33465a;
  line-height: 1.65;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 9px;
  margin-top: 0;
}

.hero-card {
  grid-area: card;
  display: grid;
  gap: 16px;
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
  width: min(100%, 300px);
  justify-self: end;
  align-self: start;
  margin-top: clamp(8px, 2.2vw, 34px);
}

.portrait {
  position: relative;
  border: 1px solid rgba(49, 111, 169, 0.18);
  border-radius: 8px;
  overflow: hidden;
  aspect-ratio: 4 / 5;
  background: linear-gradient(140deg, #0f766e, #d58a4f);
  box-shadow: 0 10px 24px rgba(28, 55, 88, 0.1);
}

.portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.portrait-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.75), rgba(197, 106, 56, 0.86));
  color: #ffffff;
  font-family: var(--font-serif);
  font-size: 2.4rem;
  letter-spacing: 0.16em;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.portrait.is-fallback .portrait-fallback {
  opacity: 1;
}

.portrait.is-fallback img {
  opacity: 0;
}

.section {
  padding: 56px 0;
}

.section-title {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 3.2vw, 2.6rem);
  line-height: 1.22;
  color: #1a283a;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 8px;
}

body[data-page="home"] #highlights .section-head {
  border-bottom: 1px solid var(--line);
  margin-bottom: 0;
  padding-bottom: 14px;
}

.section-head .section-title {
  margin-bottom: 0;
}

.section-head-btn {
  flex-shrink: 0;
}

.section-subtitle {
  margin: 0 0 12px;
  color: var(--muted);
  line-height: 1.72;
}

.inline-link {
  color: var(--accent-deep);
  font-weight: inherit;
  border-bottom: 1px solid transparent;
}

.inline-link:hover {
  color: var(--accent);
  border-bottom-color: rgba(75, 136, 199, 0.42);
}

.publications {
  display: grid;
  gap: 14px;
  margin-top: 16px;
}

body[data-page="home"] .publications {
  gap: 18px;
  margin-top: 14px;
}

body[data-page="home"] .pub-list {
  gap: 12px;
}

body[data-page="home"] .pub-item {
  padding-left: 18px;
}

body[data-page="home"] .pub-item::before {
  left: 1px;
  top: 3px;
  color: #5c7fa5;
}

body[data-page="publications"] .pub-block + .pub-block {
  margin-top: 12px;
}

.pub-block h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  color: #2a3340;
  font-size: clamp(1.22rem, 2.1vw, 1.44rem);
  line-height: 1.28;
  position: relative;
  display: block;
}

.pub-block h3::after {
  content: "";
  display: block;
  width: 100%;
  height: 1px;
  margin-top: 8px;
  background: var(--line);
}

.pub-block.is-flat .pub-list {
  margin-top: 0;
}

.pub-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.pub-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: start;
  padding-left: 14px;
}

.pub-item::before {
  content: "•";
  position: absolute;
  left: 0;
  top: 2px;
  color: #5a6470;
  font-size: 0.95rem;
  line-height: 1;
}

.pub-main {
  display: grid;
  gap: 4px;
}

.pub-title {
  font-weight: 400;
  line-height: 1.5;
}

a.pub-title {
  color: #336da6;
  transition: color 0.2s ease;
}

a.pub-title:hover {
  color: var(--accent);
}

.pub-meta {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.55;
}

.pub-year {
  min-width: 52px;
  text-align: right;
  color: #6e7f92;
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding-top: 2px;
}

.talks-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.talk-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  align-items: start;
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 6px 0 6px 14px;
}

.talk-item::before {
  content: "•";
  position: absolute;
  left: 0;
  top: 8px;
  color: #5a6470;
  font-size: 0.95rem;
  line-height: 1;
}

.talk-item strong {
  font-weight: 400;
  line-height: 1.5;
}

.talk-item strong a {
  color: var(--accent-deep);
}

.talk-item strong a:hover {
  color: var(--accent);
}

.join-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: start;
  max-width: none;
}

.join-copy {
  display: grid;
  gap: 22px;
}

.join-intro {
  gap: 16px;
}

.join-lede {
  margin: 0;
  color: var(--muted);
  font-size: 1.03rem;
  line-height: 1.72;
}

.join-section {
  padding-top: 2px;
}

.join-section h2,
.join-panel h2 {
  margin: 0 0 10px;
  color: #253a52;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.35;
}

.join-section p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.join-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 19px;
  color: var(--muted);
  line-height: 1.65;
}

.join-list.compact {
  gap: 6px;
}

.people-list {
  margin-top: 10px;
}

.person-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: baseline;
}

.person-time {
  color: #7a8794;
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.join-panel {
  display: grid;
  gap: 13px;
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: 0 1px 0 rgba(15, 23, 42, 0.02);
  padding: 0;
}

.join-panel strong {
  color: #2f4156;
  font-weight: 600;
}

.footer {
  padding: 32px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-updated {
  white-space: nowrap;
}

.noscript-box {
  margin: 0 auto 28px;
  color: #8a2d16;
  background: #fff1ed;
  border: 1px solid #f1c9bf;
  border-radius: 8px;
  padding: 10px 12px;
}

@media (max-width: 1040px) {
  .join-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .person-row {
    grid-template-columns: 1fr;
    gap: 2px;
  }

}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    grid-template-areas:
      "identity"
      "card"
      "about";
    gap: 24px;
  }

  .hero-identity,
  .hero-about {
    max-width: none;
  }

  .hero-card {
    justify-self: center;
    margin-top: 0;
  }

  .portrait {
    width: 260px;
    justify-self: center;
  }
}

@media (max-width: 860px) {
  .site-header .container {
    position: relative;
  }

  .nav {
    gap: 12px;
    padding: 12px 0;
  }

  .nav-links,
  .join-btn {
    display: none;
  }

  .mobile-menu-toggle {
    display: inline-flex;
  }

  .mobile-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    border: 1px solid var(--line);
    border-radius: 0 0 12px 12px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 12px 24px rgba(49, 111, 169, 0.12);
    padding: 8px 0 14px;
  }

  .mobile-nav:not([hidden]) {
    display: grid;
    gap: 2px;
  }

  .mobile-nav a:not(.btn) {
    padding: 9px 10px;
    border-radius: 8px;
    color: var(--accent-deep);
    font-size: 0.95rem;
    font-weight: 500;
  }

  .mobile-nav a:not(.btn):hover,
  .mobile-nav a:not(.btn):focus {
    background: #f3f7fc;
  }

  .mobile-join-btn {
    justify-self: start;
    margin: 8px 10px 0;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }
}

@media (max-width: 760px) {
  .hero {
    padding: 36px 0 30px;
  }

  .portrait {
    width: 240px;
  }

  .pub-item,
  .talk-item {
    grid-template-columns: 1fr;
  }

  .pub-year {
    text-align: left;
  }
}

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