:root {
  --text: #20262d;
  --muted: #65717c;
  --blue: #1f5f91;
  --blue-dark: #174b73;
  --blue-soft: #edf5fb;
  --link: #21699f;
  --border: #ced8e1;
  --soft: #f7f9fb;
  --white: #fff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  margin: 0;
  background: var(--white);
  color: var(--text);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

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

a:hover,
a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page {
  width: min(880px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 2px solid var(--blue);
  background: rgba(255, 255, 255, 0.97);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.site-name {
  color: var(--blue-dark);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.35rem;
  font-weight: 700;
}

.site-name:hover,
.site-name:focus-visible {
  text-decoration: none;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
}

nav a {
  color: var(--blue-dark);
  font-size: 0.91rem;
  font-weight: 550;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 190px;
  column-gap: 3.5rem;
  row-gap: 1.5rem;
  align-items: start;
  padding: 3.75rem 0 3.25rem;
  border-top: 0;
}

.portrait {
  width: 190px;
  height: 220px;
  border: 1px solid #e5e5e5;
  border-radius: 2px;
  object-fit: cover;
  object-position: center 30%;
}

.intro h1 {
  margin: -0.3rem 0 1.35rem;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--blue-dark);
  font-size: clamp(2rem, 4vw, 2.55rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.15;
}

.intro h1 span {
  margin-left: 0.45rem;
  color: var(--muted);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.56em;
  font-weight: 500;
  letter-spacing: 0;
}

.identity-lines {
  margin-bottom: 1.35rem;
}

.identity-lines p {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 0.9rem;
  margin: 0.24rem 0;
}

.identity-lines strong {
  color: var(--blue-dark);
  font-size: 0.9rem;
  font-weight: 600;
}

.intro-text {
  max-width: 820px;
}

.intro-about {
  grid-column: 1 / -1;
}

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

.intro-text p:last-child {
  margin-bottom: 0;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.15rem;
  margin-top: 1.3rem;
  font-size: 0.94rem;
}

section {
  padding: 3.25rem 0 3.5rem;
  border-top: 2px solid var(--blue);
}

.section-heading {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 2.5rem;
  align-items: start;
  margin-bottom: 1.75rem;
}

.section-heading h2 {
  margin: 0;
  color: var(--blue-dark);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.65rem;
  font-weight: 600;
}

.section-heading p {
  max-width: 650px;
  margin: 0.1rem 0 0;
  color: var(--muted);
}

.education-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-left: calc(180px + 2.5rem);
}

.education-card {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--white);
}

.institution-logo {
  display: flex;
  align-items: center;
  min-height: 86px;
  padding: 1rem 1.15rem;
}

.institution-logo img {
  display: block;
  width: 100%;
  height: 52px;
  object-fit: contain;
}

.hkust-logo {
  background: #075475;
}

.tsinghua-logo {
  background: #6c2675;
}

.education-card > div:last-child {
  padding: 1rem 1.1rem 1.15rem;
  border-top: 1px solid var(--border);
}

.education-card span {
  color: var(--muted);
  font-size: 0.82rem;
}

.education-card h3 {
  margin: 0.3rem 0 0.25rem;
  color: var(--blue-dark);
  font-size: 0.98rem;
  line-height: 1.4;
}

.education-card p {
  margin: 0;
  color: #4e5b66;
  font-size: 0.88rem;
  line-height: 1.45;
}

.research-statement {
  margin-left: calc(180px + 2.5rem);
}

.research-lead {
  margin: 0;
  font-size: 1.02rem;
}

.research-areas {
  margin: 1.65rem 0 1.8rem;
  border-top: 1px solid var(--border);
}

.research-areas article {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 1.5rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

.research-areas h3 {
  margin: 0;
  color: var(--blue-dark);
  font-size: 0.98rem;
  font-weight: 650;
}

.research-areas p {
  margin: 0;
  color: #4e5b66;
  font-size: 0.93rem;
}

.current-plan {
  margin: 1.75rem 0 1.4rem;
  padding: 1rem 1.15rem;
  border-left: 4px solid var(--blue);
  background: var(--blue-soft);
}

.current-plan strong {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--blue-dark);
}

.current-plan p,
.interest-line {
  margin: 0;
}

.interest-line {
  color: #4e5b66;
  font-size: 0.93rem;
}

.interest-line strong {
  color: var(--blue-dark);
}

.research-notes-link {
  margin: 0.85rem 0 0;
  font-size: 0.93rem;
  font-weight: 600;
}

.ideas-hero {
  padding: 4.3rem 0 3.5rem;
  border-top: 0;
}

.ideas-kicker {
  margin: 0 0 0.7rem;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.ideas-hero h1 {
  max-width: 700px;
  margin: 0;
  color: var(--blue-dark);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.35rem, 6vw, 3.65rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.ideas-intro {
  max-width: 700px;
  margin: 1.35rem 0 0;
  color: #46535e;
  font-size: 1.04rem;
}

.ideas-invitation {
  max-width: 700px;
  margin: 1rem 0 0;
  padding-left: 1rem;
  border-left: 3px solid var(--blue);
  color: var(--muted);
}

.ideas-index {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.7rem;
}

.ideas-index a {
  padding: 0.38rem 0.72rem;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--blue-dark);
  font-size: 0.86rem;
  font-weight: 600;
}

.ideas-index a:hover,
.ideas-index a:focus-visible {
  border-color: var(--blue);
  background: var(--blue-soft);
  text-decoration: none;
}

.idea-section-content {
  margin-left: calc(180px + 2.5rem);
}

.idea-entry {
  padding: 1.8rem 0 2rem;
  border-top: 1px solid var(--border);
}

.idea-entry:first-child {
  padding-top: 0;
  border-top: 0;
}

.idea-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.8rem;
  margin-bottom: 0.55rem;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.025em;
  text-transform: uppercase;
}

.idea-status {
  color: var(--blue-dark);
  font-weight: 700;
}

.idea-entry h3 {
  margin: 0 0 0.7rem;
  color: var(--blue-dark);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.3;
}

.idea-entry > p {
  margin: 0.6rem 0;
  color: #46515b;
}

.architecture {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.65rem;
  margin: 1.15rem 0;
  padding: 0;
  list-style: none;
}

.architecture li {
  min-height: 142px;
  padding: 0.9rem;
  border-top: 3px solid var(--blue);
  background: var(--blue-soft);
}

.architecture span,
.architecture strong {
  display: block;
}

.architecture span {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.architecture strong {
  margin: 0.24rem 0 0.42rem;
  color: var(--blue-dark);
  line-height: 1.3;
}

.architecture p {
  margin: 0;
  color: #52606a;
  font-size: 0.84rem;
  line-height: 1.45;
}

.idea-question {
  margin-top: 1rem !important;
  padding: 0.8rem 1rem;
  border-left: 3px solid #84abc8;
  background: var(--soft);
  color: #384854 !important;
  font-size: 0.92rem;
}

.idea-question strong {
  color: var(--blue-dark);
}

.idea-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  margin-top: 0.9rem;
  font-size: 0.88rem;
  font-weight: 600;
}

.ideas-footer-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.publication-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.publication {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) 210px;
  gap: 1.25rem;
  align-items: start;
  padding: 1.45rem 0;
  border-top: 1px solid #ececec;
}

.publication:first-child {
  border-top-color: var(--border);
}

.publication-meta {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.publication-meta strong {
  display: block;
  color: var(--blue-dark);
  font-weight: 600;
}

.publication h3 {
  margin: 0;
  font-size: 1.03rem;
  font-weight: 650;
  line-height: 1.45;
}

.publication h3 a {
  color: var(--blue-dark);
}

.publication-authors,
.publication-description,
.paper-links {
  margin: 0.35rem 0 0;
  font-size: 0.93rem;
}

.publication-authors {
  color: #494949;
}

.publication-description {
  color: var(--muted);
}

.paper-links {
  display: flex;
  gap: 0.8rem;
}

.paper-links a {
  font-size: 0.88rem;
}

.publication-figure {
  overflow: hidden;
  height: 126px;
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: var(--soft);
}

.publication-figure img,
.publication-figure video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #fff;
}

.project {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  gap: 2.5rem;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--border);
}

.project h3 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
}

.project h3 a {
  color: var(--blue-dark);
}

.project p {
  margin: 0;
  color: #494949;
}

.project ul {
  margin: 0.8rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
  font-size: 0.93rem;
}

.project-aside {
  padding-left: 1.5rem;
  border-left: 1px solid var(--border);
}

.project-aside strong,
.project-aside span {
  display: block;
}

.project-aside strong {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  font-weight: 500;
}

.project-aside span {
  margin-bottom: 0.9rem;
  color: var(--muted);
  font-size: 0.83rem;
}

.project-figure {
  grid-column: 1 / -1;
  overflow: hidden;
  margin: 0.75rem 0 0;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: #252525;
}

.project-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  display: grid;
  grid-template-columns: 130px 250px minmax(0, 1fr);
  gap: 1.4rem;
  padding: 1.2rem 0;
  border-top: 1px solid #ececec;
}

.timeline-period {
  color: var(--muted);
  font-size: 0.88rem;
}

.timeline h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 650;
}

.timeline-company {
  margin: 0.18rem 0 0;
  color: var(--blue-dark);
  font-size: 0.88rem;
}

.timeline-description {
  margin: 0;
  color: #555;
  font-size: 0.93rem;
}

.compact-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.compact-list li {
  padding: 1rem 0;
  border-top: 1px solid #ececec;
}

.compact-list strong,
.compact-list span {
  display: block;
}

.compact-list strong {
  color: var(--blue-dark);
  font-size: 0.98rem;
  font-weight: 650;
}

.compact-list span {
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.awards-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 2rem;
  margin-left: calc(180px + 2.5rem);
}

footer {
  padding: 2.5rem 0 3.5rem;
  border-top: 2px solid var(--blue);
  color: var(--muted);
  font-size: 0.87rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

footer p {
  margin: 0;
}

@media (max-width: 760px) {
  .page {
    width: min(100% - 32px, 880px);
  }

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.45rem;
    padding: 0.75rem 0;
  }

  nav {
    gap: 0.55rem 1rem;
  }

  .intro,
  .section-heading {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .intro {
    padding-top: 2.5rem;
  }

  .portrait {
    grid-row: 1;
    width: 132px;
    height: 152px;
  }

  .intro-copy {
    grid-row: 2;
  }

  .intro-about {
    grid-column: 1;
    grid-row: 3;
  }

  .research-statement {
    margin-left: 0;
  }

  .idea-section-content {
    margin-left: 0;
  }

  .architecture {
    grid-template-columns: 1fr;
  }

  .architecture li {
    min-height: 0;
  }

  .education-grid,
  .awards-list {
    grid-template-columns: 1fr;
    margin-left: 0;
  }

  .research-areas article {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }

  .publication {
    grid-template-columns: 70px minmax(0, 1fr);
  }

  .publication-figure {
    grid-column: 2;
    width: min(100%, 360px);
    height: 150px;
  }

  .project {
    grid-template-columns: 1fr;
  }

  .project-aside {
    padding: 1rem 0 0;
    border-top: 1px solid var(--border);
    border-left: 0;
  }

  .timeline li {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }

  .footer-inner {
    flex-direction: column;
  }
}

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