@font-face {
  font-family: "Lato";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: local("Lato Regular"), local("Lato-Regular"), url("https://fonts.gstatic.com/s/lato/v24/S6uyw4BMUTPHjx4wXiWtFCc.woff2") format("woff2");
}

@font-face {
  font-family: "Lato";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: local("Lato Bold"), local("Lato-Bold"), url("https://fonts.gstatic.com/s/lato/v24/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2") format("woff2");
}

:root {
  --font-cjk: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  --font-sans: "Lato", "Segoe UI", var(--font-cjk);
  --font-display: Georgia, "Times New Roman", var(--font-cjk);
  --paper: #ffffff;
  --surface: #ffffff;
  --ink: #14253d;
  --muted: #64748b;
  --line: #d4eaf4;
  --accent: #0783c0;
  --accent-strong: #006f9f;
  --accent-dark: #075a82;
  --accent-pale: #ecf8fc;
  --accent-light: #52b7df;
  --accent-label: #3b7592;
  --accent-rgb: 7, 131, 192;
  --shadow-rgb: 0, 111, 159;
  --shadow: 0 18px 50px rgba(var(--shadow-rgb), 0.1);
  --content-width: 980px;
}

html[data-theme="teal"] {
  --line: #d3ebe4;
  --accent: #009b72;
  --accent-strong: #007b5c;
  --accent-dark: #005f48;
  --accent-pale: #edf9f5;
  --accent-light: #50c7a5;
  --accent-label: #397b68;
  --accent-rgb: 0, 155, 114;
  --shadow-rgb: 0, 123, 92;
}

html[data-theme="rose"] {
  --line: #ecdbe2;
  --accent: #be185d;
  --accent-strong: #be185d;
  --accent-dark: #831843;
  --accent-pale: #fff1f5;
  --accent-light: #fb7185;
  --accent-label: #8d5369;
  --accent-rgb: 190, 24, 93;
  --shadow-rgb: 131, 24, 67;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.68;
  cursor: var(--cursor-default, auto);
}

a,
button {
  cursor: var(--cursor-pointer, pointer);
}

a {
  color: var(--accent-strong);
  text-decoration: none;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

:focus-visible {
  outline: 3px solid rgba(var(--accent-rgb), 0.42);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 9px 14px;
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  transform: translateY(-160%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  color: #fff;
  transform: translateY(0);
}

.site-shell {
  width: min(calc(100% - 44px), var(--content-width));
  margin: 0 auto;
}

.page-section {
  scroll-margin-top: 82px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 44px), var(--content-width));
  height: 58px;
  margin: 0 auto;
}

.top-nav-links {
  display: flex;
  align-self: stretch;
  gap: 4px;
}

.top-nav-links a {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0 15px;
  color: #5b6b80;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.025em;
}

.top-nav-links a::after {
  content: "";
  position: absolute;
  right: 13px;
  bottom: -1px;
  left: 13px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.18s ease;
}

.top-nav-links a:hover,
.top-nav-links a.active {
  color: #172a44;
  text-decoration: none;
}

.top-nav-links a:hover::after,
.top-nav-links a.active::after {
  transform: scaleX(1);
}

.top-nav-actions,
.theme-options {
  display: flex;
  align-items: center;
}

.top-nav-actions {
  flex: 0 0 auto;
  gap: 9px;
}

.theme-options {
  gap: 1px;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
}

.theme-option {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  padding: 0;
}

.theme-option span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08);
  transition: transform 0.18s ease;
}

.theme-option:hover span {
  transform: scale(1.18);
}

.theme-option[aria-pressed="true"] {
  box-shadow: inset 0 0 0 1.5px var(--ink);
}

.theme-blue span {
  background: #0783c0;
}

.theme-teal span {
  background: #009b72;
}

.theme-rose span {
  background: #be185d;
}

.language-toggle {
  min-width: 38px;
  height: 29px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}

.language-toggle:hover {
  border-color: rgba(var(--accent-rgb), 0.42);
  background: var(--accent-pale);
  color: var(--accent-dark);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 270px;
  gap: 64px;
  align-items: center;
  min-height: 420px;
  padding: 30px 0 27px;
}

h1 {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 6px 0 20px;
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.1;
}

h1 .name-zh {
  font-family: var(--font-cjk);
  font-size: 1em;
  letter-spacing: 0.05em;
}

.name-divider {
  width: 1px;
  height: 28px;
  background: var(--line);
}

.hero-copy > p {
  margin: 0 0 11px;
  color: #34445a;
}

.contact-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--accent-strong);
  font: inherit;
  line-height: 1.5;
}

.contact-link:hover {
  color: var(--accent-dark);
  text-decoration: none;
}

.contact-link svg {
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
}

.contact-sub {
  max-width: 165px;
  overflow: hidden;
  color: #8b9aab;
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.contact-separator {
  color: #c5d1df;
}

.portrait-wrap {
  margin: 0;
}

.portrait-contact {
  justify-content: center;
  flex-wrap: nowrap;
  gap: 8px;
  margin-top: 17px;
  font-size: 13px;
}

.portrait-contact .contact-sub {
  max-width: none;
  color: var(--accent-strong);
  font-size: inherit;
}

.portrait-frame {
  position: relative;
  padding: 6px;
  border: 1px solid rgba(var(--accent-rgb), 0.17);
  border-radius: 18px 18px 70px 18px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 26px rgba(var(--shadow-rgb), 0.08);
  transform: rotate(1.6deg);
}

.portrait-frame::before {
  content: "";
  position: absolute;
  inset: -13px 18px 20px -13px;
  z-index: -1;
  border: 1px solid rgba(var(--accent-rgb), 0.24);
  border-radius: 22px 22px 74px 22px;
}

.portrait-frame img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 11px 11px 60px 11px;
  filter: saturate(0.9) contrast(1.02);
}

.content-section {
  padding: 26px 0 28px;
}

.section-heading {
  margin-bottom: 13px;
}

.section-heading h2 {
  position: relative;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(27px, 4vw, 34px);
  font-weight: 400;
  line-height: 1.2;
}

#research .section-heading h2,
#education .section-heading h2,
#awards .section-heading h2 {
  font-size: clamp(25px, 3vw, 32px);
}

.section-heading h2::after {
  display: none;
}

.section-intro {
  max-width: none;
  margin: 0 0 12px;
  color: #405168;
}

.interest-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-left: 0;
}

.interest-card {
  position: relative;
  min-height: 0;
  padding: 4px 0 6px;
}

.interest-card:hover {
  transform: none;
}

.interest-card h3,
.education-content h3,
.award-item h3 {
  margin: 0;
  color: #1b2f4a;
  font-size: 15px;
}

.interest-card p {
  position: relative;
  margin: 6px 0 0 13px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.interest-card h3 {
  display: flex;
  align-items: center;
  white-space: nowrap;
}

.interest-card h3::before {
  width: 5px;
  height: 5px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--accent-strong);
  content: "";
  flex: 0 0 auto;
}

.research-outcome {
  margin: 21px 0 0;
}

.publication-card {
  display: grid;
  grid-template-columns: minmax(0, 1.33fr) minmax(0, 1fr);
  gap: 20px;
  padding: 14px;
  border: 1px solid rgba(var(--accent-rgb), 0.16);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.82);
}

.publication-card + .publication-card {
  margin-top: 12px;
}

.publication-visual {
  position: relative;
  grid-column: 2;
  grid-row: 1;
  align-self: center;
  display: block;
  aspect-ratio: 16 / 10;
  min-height: 0;
  overflow: hidden;
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  border-radius: 11px;
  background: var(--accent-pale);
}

.publication-visual:hover {
  text-decoration: none;
}

.publication-visual video,
.publication-visual img {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 0.3s ease;
}

.publication-card:hover .publication-visual img {
  transform: scale(1.025);
}

.publication-visual.publication-visual-video {
  aspect-ratio: 343 / 269;
  background: #fff;
}

.publication-visual-video video {
  object-fit: contain;
}

.publication-visual-wide {
  aspect-ratio: 2.1 / 1;
  background: #fff;
}

.publication-visual-wide img {
  padding: 4px;
  object-fit: contain;
}

.publication-copy {
  grid-column: 1;
  grid-row: 1;
  align-self: center;
  min-width: 0;
  padding: 2px 0 2px 2px;
}

.publication-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 9px;
}

.publication-tag {
  display: inline-flex;
  align-items: center;
  min-height: 23px;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.publication-tag-venue {
  background: var(--accent-strong);
  color: #fff;
}

.publication-tag-role {
  border: 1px solid rgba(var(--accent-rgb), 0.34);
  background: var(--accent-pale);
  color: var(--accent-dark);
}

.publication-copy h3 {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
}

.publication-copy h3 a {
  color: #172a44;
}

.publication-copy h3 a:hover {
  color: var(--accent-dark);
  text-decoration-color: var(--accent);
}

.publication-authors {
  margin: 8px 0 0;
  color: #516176;
  font-size: 12px;
  line-height: 1.5;
}

.publication-authors strong {
  color: #1b2c45;
  font-weight: 700;
}

.publication-description {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.publication-highlight {
  color: var(--accent-strong);
  font-weight: 700;
}

.publication-resources {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.resource-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 27px;
  padding: 4px 9px;
  border: 1px solid rgba(var(--accent-rgb), 0.15);
  border-radius: 999px;
  background: #f1f5fa;
  color: #516176;
  font-size: 10px;
  font-weight: 700;
  line-height: 1;
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.resource-chip:hover {
  border-color: rgba(var(--accent-rgb), 0.42);
  background: var(--accent-pale);
  color: var(--accent-dark);
  text-decoration: none;
  transform: translateY(-1px);
}

.resource-chip svg {
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
}

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

.education-card {
  display: grid;
  grid-template-columns: 166px minmax(0, 1fr);
  gap: 30px;
  align-items: center;
  min-height: 126px;
  padding: 19px 26px;
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 5px 18px rgba(var(--shadow-rgb), 0.055);
}

.education-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.education-logo:hover {
  text-decoration: none;
}

.education-logo img {
  display: block;
  max-width: 100%;
  max-height: 82px;
  object-fit: contain;
}

.education-logo-nankai img {
  width: 160px;
}

.education-logo-csu img {
  width: 160px;
}

.education-content h3 {
  font-size: 18px;
  line-height: 1.42;
}

.education-content h3 a {
  color: inherit;
}

.education-content h3 a:hover {
  color: var(--accent-dark);
}

.education-separator {
  margin: 0 0.3em;
  color: var(--muted);
  font-weight: 400;
}

.education-date,
.award-item time {
  color: var(--accent-label);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.education-content .education-date {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 400;
}

.award-list {
  margin-left: 0;
}

.award-item {
  display: grid;
  grid-template-columns: 128px 1fr;
  gap: 28px;
  align-items: baseline;
  padding: 10px 0;
}

.award-item > div {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
}

.award-item p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.award-item h3 {
  color: var(--accent-strong);
  font-size: 13px;
  font-weight: 400;
}

.vision-footer {
  width: 100%;
  overflow: hidden;
  background: #030303;
}

.vision-footer-stage {
  position: relative;
  min-height: 460px;
  isolation: isolate;
  overflow: hidden;
}

.vision-footer-stage picture {
  display: block;
}

.vision-footer-image {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.vision-footer-stage::before,
.vision-footer-stage::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.vision-footer-stage::before {
  background: linear-gradient(180deg, #fff 0%, rgba(255, 255, 255, 0.82) 9%, rgba(255, 255, 255, 0.2) 25%, transparent 43%);
}

.vision-footer-stage::after {
  background: linear-gradient(180deg, transparent 30%, rgba(0, 0, 0, 0.1) 58%, rgba(0, 0, 0, 0.64) 100%);
}

.vision-footer-content {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  min-height: 460px;
  padding: 80px 24px 62px;
}

.vision-footer-motto {
  max-width: 900px;
  margin: 0;
  color: rgba(203, 210, 218, 0.78);
  font-family: var(--font-display);
  font-size: clamp(20px, 2vw, 28px);
  font-weight: 400;
  line-height: 1.35;
  text-align: center;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.52);
  text-wrap: balance;
}

#back-to-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 43px;
  height: 43px;
  border: 0;
  border-radius: 50%;
  background: rgba(var(--accent-rgb), 0.88);
  box-shadow: 0 3px 14px rgba(0, 0, 0, 0.2);
  color: #fff;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
}

#back-to-top.visible {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
}

#back-to-top:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
}

#back-to-top svg {
  width: 19px;
  height: 19px;
}

@media (min-width: 681px) {
  body {
    font-size: 16px;
  }

  .publication-card:nth-of-type(even) .publication-visual {
    grid-column: 1;
  }

  .publication-card:nth-of-type(even) .publication-copy {
    grid-column: 2;
    padding-right: 2px;
    padding-left: 0;
  }

  .top-nav-links a {
    font-size: 13px;
  }

  h1 {
    font-size: clamp(36px, 3.6vw, 46px);
  }

  .contact-sub {
    font-size: 13px;
  }

  .section-heading h2 {
    font-size: clamp(30px, 3vw, 36px);
  }

  .interest-card h3 {
    font-size: 16px;
  }

  .education-content h3 {
    font-size: 18px;
  }

  .interest-card p,
  .award-item h3,
  .award-item p {
    font-size: 14px;
  }

  .publication-tag {
    font-size: 10px;
  }

  .publication-copy h3 {
    font-size: 18px;
  }

  .publication-authors,
  .publication-description,
  .education-date,
  .award-item time {
    font-size: 13px;
  }

  .resource-chip {
    font-size: 11px;
  }
}

@media (max-width: 680px) {
  .top-nav {
    width: calc(100% - 24px);
    height: 52px;
    padding: 0;
  }

  .top-nav-links {
    min-width: 0;
    gap: 0;
  }

  .top-nav-links a {
    flex: 0 1 auto;
    justify-content: center;
    padding: 0 7px;
    font-size: 10px;
  }

  .top-nav-links a::after {
    right: 7px;
    left: 7px;
  }

  .top-nav-actions {
    gap: 5px;
  }

  .theme-options {
    padding: 1px;
  }

  .theme-option {
    width: 21px;
    height: 24px;
  }

  .theme-option span {
    width: 10px;
    height: 10px;
  }

  .language-toggle {
    min-width: 34px;
    height: 27px;
    padding: 0 7px;
    font-size: 10px;
  }

  .site-shell {
    width: min(calc(100% - 32px), var(--content-width));
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 27px;
    min-height: 0;
    padding: 29px 0 31px;
  }

  .hero-copy {
    order: 1;
  }

  .portrait-wrap {
    order: 2;
    width: min(78vw, 290px);
    margin: 0 auto;
  }

  h1 {
    gap: 9px;
    font-size: 34px;
  }

  .name-divider {
    height: 24px;
  }

  .content-section {
    padding: 24px 0 26px;
  }

  .vision-footer-stage,
  .vision-footer-content {
    min-height: 340px;
  }

  .vision-footer-content {
    padding: 68px 22px 76px;
  }

  .vision-footer-motto {
    font-size: 18px;
    line-height: 1.42;
  }

  .interest-grid {
    grid-template-columns: 1fr;
    row-gap: 5px;
  }

  .interest-card {
    padding: 4px 0 6px;
  }

  .publication-card {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 12px;
  }

  .publication-visual {
    grid-column: 1;
    grid-row: auto;
    min-height: 0;
    aspect-ratio: 16 / 9;
  }

  .publication-copy {
    grid-column: 1;
    grid-row: auto;
    padding: 0 2px 5px;
  }

  .education-card {
    grid-template-columns: 82px minmax(0, 1fr);
    gap: 13px;
    min-height: 0;
    padding: 14px;
  }

  .education-logo img {
    max-height: 66px;
  }

  .education-logo-nankai img {
    width: 80px;
  }

  .education-logo-csu img {
    width: 80px;
  }

  .education-content h3 {
    font-size: 15px;
  }

  .education-content .education-date {
    font-size: 13px;
  }

  .award-item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 12px;
    padding: 8px 0;
  }

  #back-to-top {
    right: 16px;
    bottom: 16px;
  }
}

@media (max-width: 360px) {
  .top-nav {
    width: calc(100% - 16px);
  }

  .top-nav-links a {
    padding: 0 4px;
    font-size: 9px;
  }

  .top-nav-links a::after {
    right: 4px;
    left: 4px;
  }

  .theme-option {
    width: 18px;
  }

  .language-toggle {
    min-width: 30px;
    padding: 0 5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .topbar,
  #back-to-top,
  .vision-footer {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .hero {
    min-height: 0;
  }
}