:root {
  color-scheme: light;
  --bg: #f8f9fa;
  --surface: #ffffff;
  --surface-soft: #f3f6fb;
  --ink: #212529;
  --muted: #6c757d;
  --line: #dee2e6;
  --line-soft: #edf0f3;
  --accent: #0d6efd;
  --accent-dark: #0a58ca;
  --accent-soft: #e7f1ff;
  --shadow: 0 0.125rem 0.5rem rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 0.75rem 2rem rgba(33, 37, 41, 0.08);
  --radius: 0.8rem;
  --max: 1140px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding-top: 78px;
  background: var(--bg);
  color: var(--ink);
  font-family: "Lato", "Fira Sans", "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.62;
  letter-spacing: 0;
}

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

a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.16em;
}

img {
  max-width: 100%;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 8px 12px;
  color: #fff;
  background: var(--ink);
  border-radius: 0.45rem;
}

.skip-link:focus {
  top: 14px;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  min-height: 64px;
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid rgba(222, 226, 230, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(var(--max), calc(100% - 40px));
  min-height: 64px;
  margin: 0 auto;
}

.brand {
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover {
  color: var(--ink);
  text-decoration: none;
}

.topnav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 2px;
  flex-wrap: wrap;
  font-size: 0.95rem;
}

.topnav a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 8px 11px;
  color: rgba(33, 37, 41, 0.74);
  border-radius: 0.45rem;
  text-decoration: none;
}

.topnav a:hover,
.topnav a[aria-current="page"] {
  color: var(--ink);
  background: rgba(13, 110, 253, 0.08);
  text-decoration: none;
}

.language-link {
  margin-left: 6px;
  color: var(--accent-dark) !important;
  background: var(--surface);
  border: 1px solid var(--line);
}

.page-shell {
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  gap: 28px;
  width: min(var(--max), calc(100% - 40px));
  margin: 24px auto 52px;
  align-items: start;
}

.page-shell.single-column {
  display: block;
}

.sidebar {
  position: sticky;
  top: 88px;
  min-width: 0;
}

.profile-card,
.content-card,
.mini-card,
.hero-card,
.not-found-card {
  background: var(--surface);
  border: 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.profile-card {
  overflow: hidden;
}

.profile-card-body {
  padding: 1.5rem 1.35rem 1.25rem;
}

.profile-portrait {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  margin: 0 auto 1.2rem;
  object-fit: cover;
  background: var(--surface-soft);
  border-radius: 0.65rem;
}

.profile-name {
  margin: 0;
  text-align: center;
  font-size: 1.45rem;
  line-height: 1.2;
  font-weight: 700;
}

.profile-name small {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 400;
}

.profile-position,
.profile-affiliation,
.profile-email {
  margin: 0.55rem 0 0;
  color: var(--muted);
  text-align: center;
  font-size: 0.94rem;
}

.profile-position {
  color: var(--ink);
}

.profile-email {
  font-family: "Source Code Pro", "SFMono-Regular", Consolas, monospace;
  font-size: 0.88rem;
}

.profile-links {
  display: flex;
  justify-content: center;
  gap: 0.55rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.profile-links a,
.tag,
.pub-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0.24rem 0.55rem;
  color: var(--accent-dark);
  background: var(--accent-soft);
  border: 1px solid rgba(13, 110, 253, 0.12);
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.profile-links a:hover,
.pub-link:hover {
  color: #fff;
  background: var(--accent-dark);
  text-decoration: none;
}

.profile-note {
  margin: 1rem 0 0;
  padding-top: 1rem;
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
  font-size: 0.9rem;
}

.content-flow {
  display: grid;
  gap: 18px;
  min-width: 0;
}

.content-card {
  overflow: hidden;
}

.card-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 54px;
  padding: 0.95rem 1.35rem;
  border-bottom: 1px solid var(--line);
}

.card-heading h1,
.card-heading h2,
.card-heading h3 {
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.3;
  font-weight: 700;
}

.card-heading a {
  flex: 0 0 auto;
  font-size: 0.9rem;
  font-weight: 700;
}

.card-body {
  padding: 1.35rem;
}

.card-body > :first-child {
  margin-top: 0;
}

.card-body > :last-child {
  margin-bottom: 0;
}

.lead-name {
  margin: 0 0 0.55rem;
  font-size: 2rem;
  line-height: 1.18;
  font-weight: 400;
}

.lead-name strong {
  font-weight: 700;
}

.lead-name small {
  color: var(--muted);
  font-size: 1.15rem;
  font-weight: 400;
}

.bio-text {
  color: #343a40;
}

.bio-text p {
  margin: 0 0 0.8rem;
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  padding-top: 1rem;
  margin-top: 1rem;
  border-top: 1px solid var(--line-soft);
}

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

.research-visual {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 1.35rem;
  align-items: center;
}

.research-map {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: var(--surface);
}

.stats-grid,
.theme-grid,
.direction-grid,
.material-list,
.split-grid {
  display: grid;
  gap: 1rem;
}

.stats-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1rem;
}

.mini-card {
  padding: 1rem;
}

.mini-card strong {
  display: block;
  font-size: 1.45rem;
  line-height: 1.1;
}

.mini-card span {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.news-list,
.check-list {
  padding: 0;
  margin: 0;
  list-style: none;
}

.news-list li {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 1rem;
  padding: 0.82rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.news-list li:first-child {
  padding-top: 0;
}

.news-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.news-list time {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.timeline {
  display: grid;
  gap: 0;
}

.timeline-item {
  display: grid;
  grid-template-columns: 148px minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.timeline-item:first-child {
  padding-top: 0;
}

.timeline-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.timeline-date {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.timeline-item h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.timeline-item p {
  margin: 0;
  color: var(--muted);
}

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

.publication-group:first-child {
  border-top: 0;
}

.publication-group-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.35rem;
  background: #fbfcfd;
  border-bottom: 1px solid var(--line);
}

.publication-group-title h3 {
  margin: 0;
  font-size: 1rem;
}

.publication-list {
  display: block;
}

.publication-item {
  display: grid;
  grid-template-columns: 116px minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem 1.35rem;
  background: var(--surface);
  border-bottom: 1px solid var(--line-soft);
}

.publication-item:last-child {
  border-bottom: 0;
}

.publication-item[hidden] {
  display: none;
}

.publication-cover {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 76px;
  padding: 0.75rem;
  color: #fff;
  background:
    radial-gradient(circle at 30% 22%, rgba(255, 255, 255, 0.72) 0 9px, transparent 10px),
    radial-gradient(circle at 76% 72%, rgba(255, 255, 255, 0.34) 0 18px, transparent 19px),
    linear-gradient(135deg, #0d6efd, #475569);
  border-radius: 0.45rem;
  font-size: 0.83rem;
  font-weight: 800;
  text-align: center;
}

.publication-cover.alt {
  background:
    radial-gradient(circle at 28% 75%, rgba(255, 255, 255, 0.5) 0 16px, transparent 17px),
    radial-gradient(circle at 78% 28%, rgba(255, 255, 255, 0.32) 0 22px, transparent 23px),
    linear-gradient(135deg, #198754, #0f5132);
}

.publication-cover.warm {
  background:
    radial-gradient(circle at 24% 26%, rgba(255, 255, 255, 0.52) 0 14px, transparent 15px),
    radial-gradient(circle at 78% 66%, rgba(255, 255, 255, 0.3) 0 20px, transparent 21px),
    linear-gradient(135deg, #6f42c1, #3b2f63);
}

.publication-content h2,
.publication-content h3,
.publication-content h4 {
  margin: 0 0 0.28rem;
  color: var(--ink);
  font-size: 1.02rem;
  line-height: 1.36;
  font-weight: 400;
}

.publication-content p {
  margin: 0.18rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.publication-authors {
  color: #343a40 !important;
}

.publication-authors strong {
  color: var(--accent-dark);
}

.venue {
  display: inline-block;
  margin-bottom: 0.42rem;
  color: var(--accent-dark);
  font-size: 0.83rem;
  font-weight: 800;
}

.pub-links {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
  margin-top: 0.55rem;
}

.author-note {
  margin: 0;
  padding: 1rem 1.35rem;
  color: var(--muted);
  background: #fbfcfd;
  border-top: 1px solid var(--line);
  font-size: 0.92rem;
}

.hero-card {
  padding: 2rem;
  margin-bottom: 18px;
  box-shadow: var(--shadow-lg);
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--accent-dark);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero-card h1,
.not-found-card h1 {
  margin: 0;
  font-size: 2.35rem;
  line-height: 1.16;
  font-weight: 700;
}

.hero-card p,
.not-found-card p {
  max-width: 760px;
  margin: 0.85rem 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0.45rem 0.9rem;
  border-radius: 0.45rem;
  font-weight: 700;
  text-decoration: none;
}

.primary-action {
  color: #fff;
  background: var(--accent-dark);
}

.primary-action:hover {
  color: #fff;
  background: var(--accent);
  text-decoration: none;
}

.secondary-action {
  color: var(--accent-dark);
  background: var(--surface);
  border: 1px solid var(--line);
}

.secondary-action:hover {
  background: var(--accent-soft);
  text-decoration: none;
}

.theme-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.direction-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.theme-card,
.direction-card,
.material-card {
  display: block;
  min-width: 0;
  padding: 1.1rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  text-decoration: none;
}

.theme-card:hover {
  border-color: rgba(13, 110, 253, 0.35);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.theme-card span {
  color: var(--accent-dark);
  font-size: 0.82rem;
  font-weight: 800;
}

.theme-card h3,
.direction-card h3,
.material-card h3 {
  margin: 0.45rem 0 0.35rem;
  font-size: 1rem;
}

.theme-card p,
.direction-card p,
.material-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.muted-card {
  background: #fbfcfd;
}

.info-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.info-strip p {
  margin: 0;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.65rem;
}

.check-list {
  display: grid;
  gap: 0.7rem;
}

.check-list li {
  position: relative;
  padding-left: 1.15rem;
  color: #343a40;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--accent-dark);
  border-radius: 50%;
}

.contact-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.contact-band h2,
.contact-band p {
  margin: 0;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}

.filter-button {
  min-height: 38px;
  padding: 0.45rem 0.75rem;
  color: var(--accent-dark);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
}

.filter-button:hover,
.filter-button.active {
  color: #fff;
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.result-count {
  min-height: 24px;
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto 36px;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

.not-found-card {
  width: min(760px, calc(100% - 40px));
  margin: 28px auto;
  padding: 2rem;
}

@media (max-width: 980px) {
  .page-shell,
  .research-visual {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .profile-card-body {
    display: grid;
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 1rem;
    align-items: center;
  }

  .profile-portrait {
    margin: 0;
  }

  .profile-name,
  .profile-position,
  .profile-affiliation,
  .profile-email {
    text-align: left;
  }

  .profile-links {
    justify-content: flex-start;
  }

  .profile-note {
    grid-column: 1 / -1;
  }

  .theme-grid,
  .direction-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  body {
    padding-top: 0;
  }

  .topbar {
    position: static;
  }

  .topbar-inner {
    width: min(100% - 28px, var(--max));
    align-items: flex-start;
    flex-direction: column;
    gap: 0.3rem;
    padding: 0.75rem 0;
  }

  .topnav {
    justify-content: flex-start;
  }

  .topnav a {
    min-height: 34px;
    padding: 6px 8px;
  }

  .language-link {
    margin-left: 0;
  }

  .page-shell,
  .site-footer {
    width: min(100% - 28px, var(--max));
    margin-top: 18px;
  }

  .profile-card-body {
    grid-template-columns: 96px minmax(0, 1fr);
    padding: 1rem;
  }

  .profile-name {
    font-size: 1.25rem;
  }

  .card-heading,
  .publication-group-title,
  .publication-item,
  .author-note {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .card-body {
    padding: 1rem;
  }

  .lead-name,
  .hero-card h1,
  .not-found-card h1 {
    font-size: 1.8rem;
  }

  .stats-grid,
  .theme-grid,
  .direction-grid,
  .split-grid,
  .info-strip {
    grid-template-columns: 1fr;
  }

  .news-list li,
  .timeline-item,
  .publication-item {
    grid-template-columns: 1fr;
  }

  .publication-cover {
    min-height: 72px;
  }

  .contact-band,
  .card-heading {
    align-items: flex-start;
    flex-direction: column;
  }
}