:root {
  --ink: #1f2729;
  --text: #344145;
  --muted: #687477;
  --line: #d9e1df;
  --paper: #ffffff;
  --soft: #f7f9f8;
  --accent: #1a7f82;
  --accent-2: #6f7f38;
  --warm: #a46e2a;
  --dark: #182022;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family:
    "Microsoft YaHei",
    "PingFang SC",
    "Hiragino Sans GB",
    Arial,
    sans-serif;
  line-height: 1.72;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.wrap {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 56px);
  color: #ffffff;
  transition:
    background 180ms ease,
    color 180ms ease,
    border-color 180ms ease,
    padding 180ms ease;
}

.site-header.is-scrolled {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
  padding-top: 12px;
  padding-bottom: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: 13px;
  line-height: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 24px);
  color: inherit;
  font-size: 14px;
}

.nav-links a {
  position: relative;
  white-space: nowrap;
  opacity: 0.92;
}

.nav-links a::after {
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 2px;
  content: "";
  background: currentColor;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 160ms ease;
}

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

.hero {
  position: relative;
  min-height: 68vh;
  overflow: hidden;
  background: var(--dark);
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(20, 28, 30, 0.86), rgba(20, 28, 30, 0.6) 42%, rgba(20, 28, 30, 0.22)),
    linear-gradient(0deg, rgba(20, 28, 30, 0.2), transparent 36%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(118px, 19vh, 168px) 0 66px;
  color: #ffffff;
}

.eyebrow,
.section-label {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #b9e8e3;
}

.hero h1 {
  margin: 0;
  font-size: clamp(48px, 7vw, 86px);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero h1 span {
  display: block;
  margin-top: 6px;
  font-size: clamp(26px, 3.2vw, 40px);
  font-weight: 500;
}

.hero-title {
  margin: 24px 0 0;
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 700;
}

.hero-summary {
  max-width: 720px;
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(16px, 1.6vw, 20px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.hero-actions a,
.mail-link {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid currentColor;
  border-radius: 4px;
  padding: 8px 16px;
  font-weight: 700;
}

.hero-actions a:hover,
.mail-link:hover {
  background: rgba(255, 255, 255, 0.13);
}

.section {
  padding: 78px 0;
}

.section:nth-of-type(odd) {
  background: var(--soft);
}

.about-grid {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: clamp(30px, 6vw, 72px);
  align-items: stretch;
}

.profile-card {
  border: 1px solid var(--line);
  padding: 22px;
  background: var(--paper);
  height: 100%;
}

.about-main {
  border: 1px solid var(--line);
  padding: 22px 28px;
  background: var(--paper);
  height: 100%;
}

.profile-photo {
  width: 100%;
  height: 420px;
  object-fit: cover;
  object-position: center top;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  background: #f2f6f5;
}

.profile-card h2 {
  margin: 0 0 4px;
  font-size: 28px;
  line-height: 1.2;
}

.profile-card > p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 14px;
}

.profile-list {
  margin: 0;
}

.profile-list div {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 10px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
}

.profile-list dt {
  color: var(--muted);
}

.profile-list dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: normal;
  font-weight: 700;
}

.profile-list a {
  white-space: nowrap;
}

.profile-list a,
.paper-list em,
.project-list time,
.entry-list time {
  color: var(--accent);
}

h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.22;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  line-height: 1.38;
}

.lead {
  max-width: 840px;
  margin: 18px 0 0;
  color: var(--text);
  font-size: 17px;
}

.education-timeline {
  margin-top: 28px;
  border-top: 1px solid var(--line);
}

.education-timeline article {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.education-timeline time {
  color: var(--warm);
  font-weight: 800;
}

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

.education-timeline p {
  margin: 4px 0 0;
  color: var(--muted);
}

.research-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 36px;
  border-top: 0;
}

.research-list article {
  display: grid;
  grid-template-rows: auto auto 1fr;
  gap: 10px;
  min-height: 168px;
  border: 1px solid var(--line);
  padding: 18px;
  background: var(--paper);
}

.research-list span {
  color: var(--warm);
  font-weight: 800;
}

.research-list h3 {
  font-size: 18px;
  white-space: nowrap;
}

.research-list p {
  margin: 0;
  color: var(--text);
  font-size: 15px;
  line-height: 1.65;
}

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

.entry-list {
  margin-top: 28px;
  border-bottom: 1px solid var(--line);
}

.entry-list li {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 18px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.entry-list li.is-hidden {
  display: none;
}

.entry-list time,
.project-list time {
  font-size: 14px;
  font-weight: 800;
}

.entry-list span {
  color: var(--text);
}

.entry-list em {
  font-style: normal;
  font-weight: 700;
}

.more-button {
  margin-top: 18px;
  min-height: 40px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 8px 18px;
  color: var(--accent);
  background: transparent;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.more-button:hover {
  background: rgba(26, 127, 130, 0.08);
}

.more-button.is-hidden {
  display: none;
}

.project-list {
  margin-top: 28px;
  border-top: 1px solid var(--line);
}

.project-list article {
  display: grid;
  grid-template-columns: 110px minmax(220px, 0.45fr) minmax(0, 1fr);
  gap: 26px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.project-list h3 {
  font-size: 19px;
}

.project-list p {
  margin: 0;
  color: var(--text);
}

.paper-list {
  margin-top: 28px;
  counter-reset: papers;
}

.paper-list li {
  position: relative;
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 24px;
  padding: 22px 0 22px 48px;
  border-top: 1px solid var(--line);
  counter-increment: papers;
}

.paper-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.paper-list li::before {
  position: absolute;
  top: 20px;
  left: 0;
  color: var(--warm);
  content: counter(papers, decimal-leading-zero);
  font-weight: 800;
}

.paper-list figure {
  margin: 0;
  align-self: start;
  border: 1px solid var(--line);
  background: #ffffff;
}

.paper-list figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: contain;
  padding: 8px;
}

.paper-list span,
.paper-list em {
  display: block;
}

.paper-list span {
  margin-top: 3px;
  color: var(--text);
}

.paper-list em {
  margin-top: 4px;
  font-style: normal;
  font-weight: 700;
}

.students {
  color: #ffffff;
  background: var(--dark) !important;
}

.students .section-label {
  color: #9ed8d4;
}

.students-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.75fr) minmax(0, 1.25fr);
  gap: clamp(30px, 6vw, 72px);
}

.student-copy p {
  margin: 0 0 18px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 17px;
}

.mail-link {
  margin-top: 4px;
  color: #ffffff;
}

.site-footer {
  padding: 28px 0;
  color: #dfe7e5;
  background: #101516;
}

.footer-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-grid p {
  margin: 0;
}

.footer-grid a {
  font-weight: 700;
}

@media (max-width: 940px) {
  .site-header {
    align-items: flex-start;
    padding: 14px 20px;
  }

  .nav-links {
    max-width: 72vw;
    justify-content: flex-end;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .about-grid,
  .students-grid {
    grid-template-columns: 1fr;
  }

  .profile-card {
    display: grid;
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .profile-card h2,
  .profile-card > p,
  .profile-card dl {
    grid-column: 2;
  }

  .profile-photo {
    grid-row: 1 / span 3;
    height: 240px;
    margin-bottom: 0;
  }

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

  .research-list article,
  .project-list article,
  .paper-list li {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .paper-list li {
    padding-left: 0;
  }

  .paper-list li::before {
    position: static;
    display: block;
    margin-bottom: 4px;
  }
}

@media (max-width: 620px) {
  .wrap,
  .hero-content {
    width: min(100% - 28px, 1120px);
  }

  .brand span:last-child {
    display: none;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .nav-links {
    gap: 14px;
    font-size: 13px;
  }

  .section {
    padding: 60px 0;
  }

  .hero {
    min-height: 74vh;
  }

  .hero-actions a,
  .mail-link {
    width: 100%;
  }

  .profile-card {
    display: block;
  }

  .profile-photo {
    height: auto;
    aspect-ratio: 5 / 4;
    margin-bottom: 20px;
  }

  .research-list {
    grid-template-columns: 1fr;
  }

  .profile-list div,
  .education-timeline article,
  .entry-list li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer-grid {
    display: block;
  }

  .footer-grid a {
    display: inline-block;
    margin-top: 10px;
  }
}