:root {
  --bg: #f5efe6;
  --panel: rgba(255, 251, 245, 0.84);
  --panel-strong: rgba(250, 244, 236, 0.98);
  --line: rgba(40, 30, 22, 0.14);
  --text: #1d1611;
  --muted: #64594f;
  --accent: #0e5b58;
  --accent-soft: rgba(14, 91, 88, 0.09);
  --shadow: 0 24px 80px rgba(54, 37, 18, 0.08);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --max: 1120px;
  --font-display: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", "Baskerville", Georgia, serif;
  --font-body: "Avenir Next", "Segoe UI", "Helvetica Neue", Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-body);
  background:
    radial-gradient(circle at top left, rgba(14, 91, 88, 0.12), transparent 34%),
    radial-gradient(circle at top right, rgba(191, 132, 71, 0.12), transparent 30%),
    linear-gradient(180deg, #f8f4ee 0%, var(--bg) 100%);
}

a {
  color: inherit;
}

.lang-en,
.lang-zh {
  display: none;
}

html[data-lang="en"] .lang-en {
  display: inline;
}

html[data-lang="zh"] .lang-zh {
  display: inline;
}

.news-link.lang-en,
.news-link.lang-zh {
  display: none;
}

html[data-lang="en"] .news-link.lang-en {
  display: inline-flex;
}

html[data-lang="zh"] .news-link.lang-zh {
  display: inline-flex;
}

.page-shell {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding: 1rem 0 3rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  margin-top: 0.5rem;
  padding: 1rem 1.25rem;
  background: rgba(248, 244, 238, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 999px;
  backdrop-filter: blur(14px);
  box-shadow: 0 10px 40px rgba(66, 45, 25, 0.06);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: nowrap;
  min-width: 0;
}

.site-nav {
  display: flex;
  flex: 1 1 auto;
  min-width: 0;
  flex-wrap: nowrap;
  align-items: center;
  gap: 0.75rem;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.site-nav::-webkit-scrollbar {
  display: none;
}

.site-nav a {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 0.25rem 0;
  color: var(--muted);
  text-decoration: none;
}

.site-nav a[aria-current="page"] {
  color: var(--accent);
  font-weight: 700;
}

.header-links {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.12rem;
  flex-wrap: nowrap;
}

.lang-toggle {
  display: inline-flex;
  flex: 0 0 auto;
  padding: 0.18rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.58);
}

.lang-button {
  min-width: 2.6rem;
  padding: 0.5rem 0.7rem;
  border: 0;
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  cursor: pointer;
}

.lang-button[aria-pressed="true"] {
  color: #f4f7f7;
  background: var(--accent);
}

.view-panel {
  display: none;
}

.view-panel.is-active {
  display: block;
}

.hero,
.section,
.site-footer {
  margin-top: 1.2rem;
  padding: clamp(1.2rem, 2.8vw, 2.2rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 252, 247, 0.84), rgba(247, 240, 230, 0.78));
  box-shadow: var(--shadow);
}

.hero,
.section {
  scroll-margin-top: 7rem;
}

.hero {
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -4rem -5rem auto;
  width: 14rem;
  height: 14rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(14, 91, 88, 0.18), transparent 68%);
  pointer-events: none;
}

.hero-layout {
  position: relative;
  z-index: 1;
}

.eyebrow,
.section-kicker,
.paper-tab-meta,
.research-area-meta,
.area-launch-index,
.news-date {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.76rem;
}

h3,
h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.08;
}

h3 {
  font-size: clamp(1.35rem, 2.2vw, 1.9rem);
}

h4 {
  font-size: 1.14rem;
}

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

.hero-copy {
  max-width: 52rem;
  margin-top: 0.9rem;
  font-size: 1.04rem;
}

.section-heading {
  display: grid;
  gap: 0.3rem;
  margin-bottom: 1.15rem;
}

.section-intro {
  max-width: 42rem;
}

.news-timeline {
  display: grid;
  gap: 1rem;
  margin-left: 0.35rem;
  padding-left: 1.15rem;
  border-left: 1px solid var(--line);
}

.news-hub {
  padding-top: 1.35rem;
}

.news-item {
  position: relative;
  display: grid;
  gap: 0.5rem;
}

.news-item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.42rem;
  width: 0.58rem;
  height: 0.58rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 6px rgba(14, 91, 88, 0.08);
}

.news-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.news-item-more {
  gap: 0.55rem;
}

.news-link,
.support-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  padding: 0.46rem 0.76rem;
  border-radius: 999px;
  color: var(--accent);
  background: var(--accent-soft);
  text-decoration: none;
  font-weight: 600;
}

.news-link-more {
  padding: 0;
  border-radius: 0;
  color: var(--muted);
  background: transparent;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.news-link-more:hover,
.news-link-more:focus-visible {
  color: var(--accent);
  background: transparent;
  opacity: 1;
}

.research-preview-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.research-preview-card,
.research-detail-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
}

.research-preview-card {
  display: grid;
  gap: 0.9rem;
  padding: 1rem;
}

.area-launch {
  display: grid;
  gap: 0.35rem;
  padding: 0.2rem 0;
  text-decoration: none;
}

.area-launch strong {
  font-family: var(--font-display);
  font-size: 1.2rem;
  line-height: 1.08;
}

.paper-tab-grid {
  display: grid;
  gap: 0.75rem;
}

.paper-tab {
  display: grid;
  gap: 0.35rem;
  padding: 0.88rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel-strong);
  text-decoration: none;
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
}

.paper-tab:hover,
.paper-tab:focus-visible,
.area-launch:hover,
.area-launch:focus-visible,
.research-area-tab:hover,
.research-area-tab:focus-visible,
.social-link:hover,
.social-link:focus-visible {
  transform: translateY(-1px);
}

.paper-tab:hover,
.paper-tab:focus-visible,
.research-area-tab:hover,
.research-area-tab:focus-visible {
  border-color: rgba(14, 91, 88, 0.3);
  box-shadow: 0 14px 30px rgba(40, 30, 22, 0.08);
}

.paper-tab-title {
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.2;
}

.research-hub {
  padding-top: 1.35rem;
}

.research-area-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.research-area-tab {
  display: grid;
  gap: 0.3rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  text-decoration: none;
}

.research-area-tab[aria-selected="true"] {
  border-color: rgba(14, 91, 88, 0.32);
  background: linear-gradient(180deg, rgba(14, 91, 88, 0.1), rgba(255, 251, 245, 0.95));
  box-shadow: 0 16px 32px rgba(40, 30, 22, 0.08);
}

.research-detail-panel {
  display: none;
  gap: 1rem;
  padding: 1.15rem;
}

.research-detail-panel.is-active {
  display: grid;
}

.research-detail-copy {
  display: grid;
  gap: 0.8rem;
}

.paper-tab-grid-detail {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.research-support-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.cv-panel {
  padding-top: 1.35rem;
}

.cv-frame-wrap {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.78);
  overflow: hidden;
}

.cv-renderer {
  display: grid;
  gap: 0.9rem;
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.78);
}

.cv-loading {
  margin: 0;
  padding: 0.65rem 0.75rem;
  border-radius: 10px;
  background: rgba(14, 91, 88, 0.08);
}

.cv-page {
  border: 1px solid rgba(29, 22, 17, 0.08);
  border-radius: 10px;
  background: #ffffff;
  overflow: hidden;
}

.cv-page canvas {
  display: block;
  width: 100%;
  height: auto;
}

.cv-frame {
  width: 100%;
  height: min(78vh, 980px);
  border: 0;
  background: #ffffff;
}

.cv-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.9rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0.1rem;
  border-radius: 999px;
  outline: none;
  text-decoration: none;
  transition: transform 140ms ease, opacity 140ms ease;
}

.social-link:hover,
.social-link:focus-visible {
  opacity: 0.78;
}

.social-link:focus-visible {
  outline: 2px solid rgba(14, 91, 88, 0.28);
  outline-offset: 2px;
}

.social-link.is-collapsed {
  display: none;
}

.social-icon {
  width: 1.4rem;
  height: 1.4rem;
  display: block;
  object-fit: contain;
}

.site-footer {
  text-align: center;
}

@media (max-width: 1024px) {
  .research-preview-grid,
  .research-area-tabs,
  .paper-tab-grid-detail {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 1rem), var(--max));
    padding-top: 0.35rem;
  }

  .site-header {
    border-radius: 26px;
  }

  .header-actions {
    gap: 0.35rem;
  }

  .site-nav {
    gap: 0.62rem;
    font-size: 0.92rem;
  }

  .social-link {
    width: 1.95rem;
    height: 1.95rem;
  }

  .social-icon {
    width: 1.36rem;
    height: 1.36rem;
  }

  .hero-copy {
    margin-top: 0.75rem;
  }

  .cv-frame {
    height: min(72vh, 860px);
  }

  .cv-renderer {
    padding: 0.55rem;
    gap: 0.7rem;
  }
}

@media (max-width: 420px) {
  .site-header {
    padding: 0.85rem 0.72rem;
  }

  .site-nav {
    gap: 0.46rem;
    font-size: 0.84rem;
  }

  .lang-button {
    min-width: 2.18rem;
    padding: 0.38rem 0.5rem;
    font-size: 0.8rem;
  }

  .social-link {
    width: 1.78rem;
    height: 1.78rem;
  }

  .social-icon {
    width: 1.2rem;
    height: 1.2rem;
  }

  .cv-frame {
    height: min(68vh, 760px);
  }

  .cv-renderer {
    padding: 0.42rem;
    gap: 0.55rem;
  }
}