/* ===================================
   Academic Editorial Theme
   =================================== */
:root {
  --font-body: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-display: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --body-bg: #f1f2f3;
  --body-gradient-1: rgba(0, 0, 0, 0);
  --body-gradient-2: rgba(0, 0, 0, 0);
  --surface: #ffffff;
  --surface-strong: #ffffff;
  --surface-muted: #f6f7f8;
  --surface-dark: #15181e;
  --surface-dark-strong: #0d0e12;

  --text-color: #17181c;
  --text-muted: #3b3d45;
  --text-light: #656a76;
  --text-on-dark: #efeff1;
  --text-muted-on-dark: #b2b6bd;

  --border-color: #d5d7db;
  --border-strong: #bfc5cc;

  --link-color: #2f6fb2;
  --link-hover: #245c95;
  --accent-color: #17181c;
  --accent-soft: #eef2f5;
  --accent-purple: #7b42bc;

  --tag-oral: #e67e22;
  --tag-poster: #2f6fb2;
  --tag-good: #4f6b56;
  --tag-note: #6b6a56;

  --focus-ring: rgba(34, 100, 214, 0.28);

  --container-max-width: 1220px;
  --sidebar-width: 248px;
  --gap-size: 36px;

  --shadow-lg: rgba(97, 104, 117, 0.05) 0 1px 1px, rgba(97, 104, 117, 0.05) 0 2px 2px;
  --shadow-md: rgba(97, 104, 117, 0.05) 0 1px 1px, rgba(97, 104, 117, 0.05) 0 2px 2px;
  --shadow-sm: rgba(97, 104, 117, 0.04) 0 1px 1px, rgba(97, 104, 117, 0.04) 0 2px 2px;

  --radius-lg: 8px;
  --radius-md: 5px;
  --radius-sm: 4px;
}

body.dark-mode {
  --body-bg: #101317;
  --body-gradient-1: rgba(0, 0, 0, 0);
  --body-gradient-2: rgba(0, 0, 0, 0);
  --surface: #16181d;
  --surface-strong: #15181e;
  --surface-muted: #1d2026;

  --text-color: #efeff1;
  --text-muted: #d5d7db;
  --text-light: #b2b6bd;
  --text-on-dark: #efeff1;
  --text-muted-on-dark: #b2b6bd;

  --border-color: #2d3138;
  --border-strong: #3a4048;

  --link-color: #84afe0;
  --link-hover: #a3c5ee;
  --accent-color: #efeff1;
  --accent-soft: #20242b;

  --tag-oral: #e59a4d;
  --tag-poster: #5d94cf;
  --tag-good: #6e8b76;
  --tag-note: #8a8975;

  --focus-ring: rgba(132, 175, 224, 0.32);

  --shadow-lg: rgba(0, 0, 0, 0.24) 0 1px 1px, rgba(0, 0, 0, 0.24) 0 2px 2px;
  --shadow-md: rgba(0, 0, 0, 0.2) 0 1px 1px, rgba(0, 0, 0, 0.2) 0 2px 2px;
  --shadow-sm: rgba(0, 0, 0, 0.16) 0 1px 1px, rgba(0, 0, 0, 0.16) 0 2px 2px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  position: relative;
  margin: 0;
  padding: 24px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.66;
  color: var(--text-color);
  background: var(--body-bg);
  transition: background 0.35s ease, color 0.25s ease;
}

body::before,
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  display: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-feature-settings: "kern" 1;
  letter-spacing: -0.01em;
}

main,
section,
aside,
footer,
button,
a,
span,
div,
p {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  display: flex;
  max-width: var(--container-max-width);
  margin: 0 auto;
  gap: var(--gap-size);
  align-items: flex-start;
}

/* ===================================
   Sidebar
   =================================== */
.sidebar {
  flex: 0 0 var(--sidebar-width);
  position: sticky;
  top: 20px;
}

.sidebar-content {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 24px 20px;
  text-align: center;
  backdrop-filter: none;
  animation: rise-in 0.55s ease both;
}

.sidebar-content::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  border-radius: 0;
  background: var(--border-color);
}

.sidebar .profile-photo {
  margin-bottom: 16px;
}

.sidebar .profile-photo img {
  width: 148px;
  height: 148px;
  border-radius: 8px;
  object-fit: cover;
  object-position: center 24%;
  border: 2px solid var(--surface-strong);
  box-shadow: var(--shadow-md);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.sidebar .profile-photo img:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.sidebar .social-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 14px 0 18px;
}

.sidebar .social-links a {
  color: var(--text-muted);
  padding: 4px;
  border-radius: 8px;
  transition: color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.sidebar .social-links a:hover {
  color: var(--link-color);
  background: var(--surface-muted);
  transform: translateY(-2px);
}

.sidebar .name {
  margin: 0 0 8px;
  color: var(--accent-color);
  font-size: 28px;
  line-height: 1.02;
}

.sidebar .name .chinese {
  display: inline-block;
  margin-top: 2px;
  font-size: 22px;
  font-weight: 500;
  color: var(--text-muted);
}

.affiliation {
  margin: 0 0 14px;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.sidebar-nav {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}

.sidebar-nav-label {
  margin: 0 0 10px;
  color: var(--text-light);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: left;
}

.sidebar-nav a {
  display: block;
  position: relative;
  padding: 7px 0 7px 14px;
  margin: 2px 0;
  border-radius: 0;
  text-align: left;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 16px;
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}

.sidebar-nav a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: transparent;
  transition: background 0.2s ease;
}

.sidebar-nav a:hover {
  color: var(--link-color);
  transform: translateX(3px);
}

.sidebar-nav a.active {
  color: var(--accent-color);
  font-weight: 600;
}

.sidebar-nav a.active::before {
  background: var(--accent-color);
}

/* ===================================
   Content region
   =================================== */
.main-content {
  flex: 1;
  min-width: 0;
}

.section,
.bio-section {
  position: relative;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 32px 30px;
  margin-bottom: 18px;
  backdrop-filter: none;
  animation: rise-in 0.5s ease both;
}

.main-content .section:nth-of-type(2) {
  animation-delay: 0.06s;
}

.main-content .section:nth-of-type(3) {
  animation-delay: 0.12s;
}

.main-content .section:nth-of-type(4) {
  animation-delay: 0.18s;
}

.main-content .section:nth-of-type(5),
.main-content .section:nth-of-type(6),
.main-content .section:nth-of-type(7) {
  animation-delay: 0.24s;
}

.section::after,
.bio-section::after {
  content: none;
  position: absolute;
  right: -48px;
  top: -48px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: transparent;
}

.section-label {
  margin: 0 0 10px;
  color: var(--text-light);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-title {
  margin: 0 0 18px;
  padding-bottom: 12px;
  font-size: 32px;
  font-weight: 700;
  line-height: 1.08;
  color: var(--accent-color);
  border-bottom: 1px solid var(--border-color);
}

.section-subtitle {
  margin: 10px 0 16px;
  color: var(--text-muted);
  font-size: 20px;
  font-weight: 600;
}

.subsection-title {
  margin: 18px 0 10px;
  color: var(--text-color);
  font-size: 16px;
  font-weight: 600;
  border-left: 3px solid var(--link-color);
  padding-left: 10px;
}

.section p {
  margin: 0;
}

.bio-contact {
  margin-top: 14px !important;
  color: var(--text-muted);
}

.bio-contact strong {
  color: var(--text-color);
}

.section .highlight {
  color: var(--text-color);
  font-style: normal;
  font-weight: 700;
}

.bio-interests {
  margin: 12px 0 10px 0;
  padding-left: 20px;
  line-height: 1.5;
}

.bio-interests li + li {
  margin-top: 4px;
}

#biography p + p,
#biography ul + p {
  margin-top: 10px;
}

.intro-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(220px, 0.9fr);
  gap: 28px;
  align-items: start;
}

.intro-copy {
  position: relative;
  z-index: 1;
}

.intro-copy p + p {
  margin-top: 16px;
}

.intro-lead {
  margin: 0;
  font-family: var(--font-display);
  font-size: 34px;
  line-height: 1.16;
  color: var(--text-on-dark);
  max-width: 14ch;
}

#biography.section {
  background: var(--surface);
  border-color: var(--border-color);
}

#biography .section-title {
  color: var(--accent-color);
  border-bottom-color: var(--border-color);
}

#biography p {
  color: var(--text-color);
}

#biography a {
  color: var(--link-color);
  text-decoration-color: rgba(34, 100, 214, 0.28);
}

#biography a:hover {
  color: var(--link-hover);
  text-decoration-color: currentColor;
}

#biography .highlight {
  color: var(--text-color);
}

.intro-aside {
  display: flex;
  justify-content: flex-end;
}

.intro-note {
  width: 100%;
  padding: 16px 16px 18px;
  border: 1px solid rgba(178, 182, 189, 0.2);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.03);
  box-shadow: none;
}

.intro-note-label {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--text-muted-on-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.intro-note p {
  margin: 0;
  color: var(--text-on-dark);
  line-height: 1.55;
}

/* ===================================
   Global links and focus
   =================================== */
a {
  color: var(--link-color);
  text-decoration: underline;
  text-decoration-color: rgba(34, 100, 214, 0.28);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

a:hover {
  color: var(--link-hover);
  text-decoration-color: currentColor;
}

a:focus-visible,
a:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ===================================
   News block
   =================================== */
.news-item {
  display: flex;
  gap: 18px;
  padding: 12px 0;
  align-items: flex-start;
}

.news-item + .news-item {
  border-top: 1px dashed var(--border-color);
}

.news-date {
  flex: 0 0 104px;
  color: var(--text-light);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-mono);
  line-height: 1.45;
}

.news-text {
  flex: 1;
  position: relative;
  padding-left: 24px;
  line-height: 1.45;
}

.news-text::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.38em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--link-color);
}

.news-item:nth-child(1) .news-text::before {
  background: var(--tag-good);
  box-shadow: none;
}

.news-item:nth-child(2) .news-text::before {
  background: var(--tag-oral);
  box-shadow: none;
}

.news-item.news-professional-milestone .news-text::before {
  background: var(--tag-oral);
  box-shadow: none;
}

.news-item.news-professional-site .news-text::before {
  background: var(--tag-oral);
  box-shadow: none;
}

/* ===================================
   Generic rows
   =================================== */
.item-row {
  display: flex;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-color);
}

.item-row:last-child {
  border-bottom: none;
}

.item-date {
  flex: 0 0 156px;
  color: var(--text-light);
  font-size: 13px;
  font-family: var(--font-mono);
}

.item-content {
  flex: 1;
}

.item-content strong {
  color: var(--text-color);
}

.services-subtitle {
  margin-top: 24px;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 28px;
}

.review-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-color);
}

.review-item:nth-last-child(-n + 2) {
  border-bottom: none;
  padding-bottom: 0;
}

.review-venue {
  color: var(--text-light);
  font-size: 13px;
  font-family: var(--font-mono);
}

.review-role {
  text-align: right;
}

/* ===================================
   Publications
   =================================== */
.pub-entry {
  display: flex;
  gap: 18px;
  padding: 18px 0;
  margin: 0 0 12px;
  border-radius: 0;
  border: none;
  border-bottom: 1px solid var(--border-color);
  background: transparent;
  box-shadow: none;
  transition: transform 0.18s ease, border-color 0.2s ease;
}

.pub-entry:hover {
  transform: translateX(3px);
  border-color: var(--border-strong);
}

.pub-entry:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.pub-venue {
  flex: 0 0 136px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-color);
}

#preprints .pub-venue {
  font-size: 12px;
}

.pub-venue .tag-oral,
.pub-venue .tag-poster {
  margin-left: 0;
  font-size: 10px;
  padding: 3px 8px;
}

.pub-details {
  flex: 1;
  max-width: 94%;
}

.pub-title {
  margin-bottom: 6px;
  color: var(--text-color);
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.12;
}

.pub-authors {
  margin-bottom: 8px;
  color: var(--text-muted);
  font-size: 14px;
  max-width: 92%;
}

.pub-authors .author-name {
  white-space: nowrap;
}

.pub-authors .me {
  border-bottom: 2px solid rgba(123, 66, 188, 0.3);
  padding-bottom: 1px;
  font-weight: 600;
}

.pub-links {
  margin-bottom: 8px;
  font-size: 14px;
}

.pub-links a {
  margin-right: 6px;
  font-weight: 600;
}

.pub-tldr {
  color: var(--text-light);
  font-size: 13px;
  font-style: italic;
}

/* ===================================
   Tags
   =================================== */
.tag-oral,
.tag-poster,
.tag-top-reviewer,
.tag-notable {
  display: inline-block;
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: var(--radius-md);
  padding: 3px 8px;
  margin-left: 8px;
}

.tag-oral {
  background: var(--tag-oral);
}

.tag-poster {
  background: var(--tag-poster);
}

.tag-top-reviewer {
  background: var(--tag-oral);
}

.tag-notable {
  background: var(--tag-oral);
}

/* ===================================
   BibTeX block
   =================================== */
.bibtex-toggle {
  cursor: pointer;
  font-weight: 600;
}

.bibtex-toggle.active {
  color: var(--link-hover);
}

.bibtex-content {
  margin-top: 12px;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--surface-muted);
  padding: 12px;
  padding-right: 86px;
  animation: slide-down 0.2s ease;
}

.bibtex-content pre {
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  word-break: break-word;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
}

.bibtex-content code {
  background: transparent;
  padding: 0;
}

.bibtex-copy {
  position: absolute;
  top: 8px;
  right: 8px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--surface-dark);
  color: #fff;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.bibtex-copy:hover {
  background: #20242b;
  transform: translateY(-1px);
}

.bibtex-copy.copied {
  background: var(--tag-good);
}

/* ===================================
   Floating buttons
   =================================== */
.theme-toggle,
.back-to-top {
  position: fixed;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-color);
  border-radius: 5px;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.25s ease;
  z-index: 1000;
}

.theme-toggle {
  top: 20px;
  right: 20px;
  background: var(--surface-strong);
  color: var(--text-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 19px;
}

.theme-toggle:hover,
.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.theme-toggle .icon-sun {
  display: none;
}

body.dark-mode .theme-toggle .icon-moon {
  display: none;
}

body.dark-mode .theme-toggle .icon-sun {
  display: block;
}

.back-to-top {
  right: 20px;
  bottom: 20px;
  background: var(--surface-dark);
  border-color: rgba(178, 182, 189, 0.4);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  opacity: 0;
  visibility: hidden;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

/* ===================================
   Footer
   =================================== */
.footer {
  margin-top: 26px;
  padding: 16px;
  border-top: 1px solid var(--border-color);
  text-align: left;
  color: var(--text-light);
  font-size: 13px;
}

/* ===================================
   Motion
   =================================== */
@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slide-down {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 1100px) {
  .container {
    gap: 24px;
  }

  .sidebar {
    flex-basis: 250px;
  }

  .section,
  .bio-section {
    padding: 24px;
  }

  .pub-title {
    font-size: 24px;
  }

  .intro-lead {
    font-size: 30px;
  }
}

@media (max-width: 900px) {
  body {
    padding: 14px;
  }

  .container {
    flex-direction: column;
    gap: 18px;
  }

  .sidebar {
    position: static;
    width: 100%;
  }

  .sidebar-content {
    padding: 22px 16px;
  }

  .sidebar-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
  }

  .sidebar-nav-label {
    width: 100%;
    margin-bottom: 4px;
    text-align: center;
  }

  .sidebar-nav a {
    text-align: center;
    margin: 0;
    padding: 8px 12px;
  }

  .sidebar-nav a::before {
    display: none;
  }

  .section,
  .bio-section {
    padding: 22px 18px;
  }

  .intro-shell {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .section-title {
    font-size: 31px;
  }

  .pub-entry,
  .item-row,
  .news-item {
    flex-direction: column;
    gap: 6px;
  }

  .review-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .review-item {
    padding: 12px 0;
  }

  .review-item:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
  }

  .review-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }

  .pub-venue,
  .item-date,
  .news-date {
    flex: none;
  }

  .pub-title {
    font-size: 20px;
  }
}

@media (max-width: 600px) {
  body {
    padding: 10px;
  }

  body::before {
    opacity: 0.2;
  }

  .sidebar .profile-photo img {
    width: 122px;
    height: 122px;
  }

  .sidebar .name {
    font-size: 32px;
  }

  .sidebar .name .chinese {
    font-size: 16px;
  }

  .section,
  .bio-section {
    border-radius: 8px;
    padding: 18px 14px;
  }

  .section-title {
    font-size: 26px;
  }

  .section-subtitle {
    font-size: 16px;
  }

  .pub-entry {
    padding: 14px;
    gap: 10px;
  }

  .pub-title {
    font-size: 18px;
  }

  .intro-lead {
    font-size: 24px;
    max-width: none;
  }

  .pub-authors,
  .pub-links {
    font-size: 13px;
  }

  .pub-tldr {
    font-size: 12px;
  }

  .theme-toggle,
  .back-to-top {
    width: 40px;
    height: 40px;
  }

  .theme-toggle {
    top: 10px;
    right: 10px;
  }

  .back-to-top {
    right: 10px;
    bottom: 10px;
  }

  .bibtex-content {
    padding: 10px;
  }

  .bibtex-copy {
    position: static;
    margin-top: 8px;
    width: 100%;
    justify-content: center;
  }
}

/* ===================================
   Print styles
   =================================== */
@media print {
  body {
    background: #fff;
    padding: 0;
    color: #000;
  }

  body::before,
  body::after,
  .theme-toggle,
  .back-to-top,
  .sidebar-nav {
    display: none;
  }

  .container {
    flex-direction: column;
    gap: 14px;
    max-width: 100%;
  }

  .sidebar {
    position: static;
  }

  .sidebar-content,
  .section,
  .bio-section,
  .pub-entry {
    box-shadow: none;
    border: 1px solid #ddd;
    background: #fff;
  }

  .pub-entry {
    page-break-inside: avoid;
  }

  a {
    color: #000;
  }

  a[href^='http']::after {
    content: ' (' attr(href) ')';
    font-size: 0.85em;
  }
}