:root {
  --ink: #222;
  --muted: #666;
  --light: #888;
  --line: #dedede;
  --paper: #fff;
  --soft: #f7f7f7;
  --accent: #1f6f8b;
  --accent-dark: #15516a;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 74px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 15px;
  line-height: 1.55;
}

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

a:hover,
a:focus {
  color: var(--accent-dark);
  text-decoration: underline;
}

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

.page-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  min-height: 100vh;
  padding: 34px 26px;
  border-right: 1px solid var(--line);
  background: var(--soft);
}

.portrait {
  width: 190px;
  height: 230px;
  margin: 0 auto 18px;
  object-fit: cover;
  object-position: center 18%;
  border-radius: 4px;
  border: 1px solid #d2d2d2;
}

.sidebar h1 {
  margin: 0;
  font-size: 1.42rem;
  line-height: 1.2;
  text-align: center;
}

.name-cn,
.role,
.affiliation,
.location {
  margin: 5px 0 0;
  color: var(--muted);
  text-align: center;
}

.role {
  margin-top: 14px;
  color: var(--ink);
  font-weight: 700;
}

.sidebar-links {
  display: grid;
  justify-items: stretch;
  gap: 12px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.sidebar-links a,
.sidebar-link-static {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  min-height: 32px;
  padding: 4px 0;
  color: var(--accent);
  font-weight: 700;
  line-height: 1.2;
  text-align: left;
}

.sidebar-link-static {
  color: var(--muted);
}

.link-icon {
  display: inline-grid;
  flex: 0 0 auto;
  place-items: center;
  width: 18px;
  height: 18px;
  color: var(--accent);
}

.link-icon svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.text-icon {
  width: 22px;
  height: 22px;
  border: 1.5px solid currentColor;
  border-radius: 50%;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0;
}

.main-column {
  min-width: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  min-height: 58px;
  padding: 0 42px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  align-items: center;
}

.tab-link {
  display: inline-flex;
  align-items: center;
  min-height: 58px;
  color: #444;
  border-bottom: 3px solid transparent;
  font-size: 0.96rem;
  font-weight: 700;
}

.tab-link:hover,
.tab-link:focus {
  color: var(--accent);
  text-decoration: none;
}

.tab-link.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  margin-right: 12px;
  padding: 8px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 4px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.content {
  max-width: 1280px;
  padding: 42px 54px 32px;
}

.page-section {
  display: block;
  scroll-margin-top: 76px;
  margin-bottom: 42px;
}

h2 {
  margin: 0 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 1.65rem;
  line-height: 1.2;
}

h3 {
  margin: 28px 0 10px;
  font-size: 1.08rem;
}

h4 {
  margin: 0 0 8px;
  font-size: 1rem;
  line-height: 1.3;
}

p {
  margin: 0 0 14px;
}

.research-taxonomy {
  display: grid;
  gap: 14px;
}

.research-item {
  padding: 15px 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.research-item p {
  margin-bottom: 11px;
  color: var(--muted);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.tech-tags span {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 8px;
  border: 1px solid #d7e6ec;
  border-radius: 4px;
  color: var(--accent-dark);
  background: #f3f8fa;
  font-size: 0.84rem;
  line-height: 1.25;
}

.compact-list,
.news-list,
.entry-list,
.project-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.compact-list li {
  position: relative;
  margin-bottom: 10px;
  padding-left: 18px;
}

.compact-list li::before {
  position: absolute;
  left: 0;
  color: var(--accent);
  content: "·";
  font-weight: 800;
}

.news-list {
  display: grid;
  gap: 10px;
}

.news-list li,
.entry-list li {
  display: grid;
  grid-template-columns: 98px minmax(0, 1fr);
  gap: 18px;
  padding: 9px 0;
  border-bottom: 1px solid #ececec;
}

.entry-list li {
  grid-template-columns: 150px minmax(0, 1fr);
}

.education-list .entry-date {
  white-space: nowrap;
}

.education-list div {
  display: flex;
  flex-wrap: nowrap;
  gap: 0;
  align-items: baseline;
  white-space: nowrap;
}

.education-list p {
  margin: 0;
}

.education-list strong,
.education-list p {
  min-width: 0;
}

.education-list p::before {
  margin: 0 10px;
  color: #aaa;
  content: "|";
}

.news-list time,
.entry-date {
  color: var(--accent);
  font-weight: 700;
}

.entry-list p,
.project-list span,
.note {
  color: var(--muted);
}

.publication-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}

.publication-header h2 {
  margin-bottom: 0;
  border-bottom: 0;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-top: 2px;
}

.filter-button {
  min-height: 30px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 4px;
  color: #444;
  cursor: pointer;
  font: inherit;
  font-size: 0.86rem;
}

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

.publication-list {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.publication-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid #e7e7e7;
}

.publication-list[data-filter="first"] .publication-card {
  grid-template-columns: 205px minmax(0, 1fr);
}

.publication-card.is-hidden {
  display: none;
}

.pub-thumb {
  display: none;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: #fff;
}

.publication-list[data-filter="first"] .pub-thumb {
  display: block;
}

.pub-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 5px;
}

.tag {
  color: var(--light);
  font-size: 0.82rem;
}

.tag + .tag::before {
  margin-right: 6px;
  color: #bbb;
  content: "|";
}

.pub-title {
  margin: 0 0 4px;
  color: var(--ink);
  font-size: 1.02rem;
  line-height: 1.32;
}

.pub-venue {
  margin-bottom: 4px;
  color: var(--muted);
  font-style: italic;
}

.pub-authors {
  margin-bottom: 8px;
}

.pub-authors strong {
  color: #000;
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: 0.92rem;
}

.publication-list:not([data-filter="first"]) .code-link {
  display: none;
}

.pub-links span,
.bibtex-summary {
  color: #aaa;
}

.bibtex-details {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  margin: 0;
}

.bibtex-summary {
  display: inline-flex;
  cursor: pointer;
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 700;
  list-style: none;
}

.bibtex-summary::-webkit-details-marker {
  display: none;
}

.bibtex-summary:hover {
  color: var(--accent-dark);
}

.bibtex-block {
  flex-basis: 100%;
  overflow-x: auto;
  margin: 8px 0 0;
  padding: 12px;
  border: 1px solid var(--line);
  background: #fafafa;
  border-radius: 4px;
  color: #333;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.84rem;
  line-height: 1.45;
  white-space: pre;
}

.project-list {
  display: grid;
  gap: 12px;
}

.project-list li {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 18px;
  padding: 10px 0;
  border-bottom: 1px solid #ececec;
}

.project-list a {
  font-weight: 700;
}

.site-footer {
  max-width: 980px;
  padding: 20px 54px 32px;
  color: var(--light);
  font-size: 0.86rem;
}

@media (max-width: 900px) {
  .page-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    min-height: 0;
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 18px;
    padding: 22px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .portrait {
    grid-row: span 5;
    width: 120px;
    height: 145px;
    margin: 0;
  }

  .sidebar h1,
  .name-cn,
  .role,
  .affiliation,
  .location {
    text-align: left;
  }

  .sidebar-links {
    grid-column: 1 / -1;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 0;
  }

  .topbar {
    padding: 0 22px;
  }

  .content,
  .site-footer {
    padding-right: 22px;
    padding-left: 22px;
  }
}

@media (max-width: 700px) {
  .nav-toggle {
    display: block;
  }

  .topbar {
    align-items: start;
    min-height: 54px;
    padding-top: 8px;
    padding-bottom: 8px;
  }

  .tabs {
    display: none;
    flex: 1;
    gap: 0;
  }

  .tabs.open {
    display: grid;
  }

  .tab-link {
    min-height: 36px;
    border-bottom-width: 0;
  }

  .sidebar {
    grid-template-columns: 96px minmax(0, 1fr);
  }

  .portrait {
    width: 96px;
    height: 116px;
  }

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

  .publication-header,
  .publication-card,
  .news-list li,
  .entry-list li,
  .project-list li {
    grid-template-columns: 1fr;
  }

  .publication-list[data-filter="first"] .publication-card {
    grid-template-columns: 1fr;
  }

  .publication-header {
    display: grid;
  }

  .education-list div {
    flex-wrap: wrap;
    white-space: normal;
  }

  .pub-thumb {
    max-width: 320px;
  }
}