:root {
  --accent: #7a1f2b;
  --accent-dark: #5f1721;
  --ink: #202124;
  --muted: #60646c;
  --line: #dedbd8;
  --paper: #ffffff;
  --wash: #f7f6f4;
  --notice: #fbf7f2;
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover,
a:focus-visible {
  color: var(--accent-dark);
}

:focus-visible {
  outline: 3px solid rgba(122, 31, 43, 0.28);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -5rem;
  left: 1rem;
  z-index: 100;
  padding: 0.55rem 0.9rem;
  background: var(--accent);
  color: #fff;
}

.skip-link:focus {
  top: 0.75rem;
  color: #fff;
}

.site-header {
  border-top: 5px solid var(--accent);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.98);
}

.header-inner,
.page-shell,
.footer-inner {
  width: min(calc(100% - 2.5rem), var(--max-width));
  margin-inline: auto;
}

.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 2rem;
  min-height: 96px;
}

.identity {
  color: var(--ink);
  text-decoration: none;
}

.identity-name {
  display: block;
  font-family: Georgia, "Times New Roman", "Noto Serif SC", serif;
  font-size: 1.65rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.01em;
}

.identity-affiliation {
  display: block;
  margin-top: 0.28rem;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.35;
}

.site-nav ul {
  display: flex;
  justify-content: center;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: block;
  padding: 0.55rem 0.75rem;
  border-bottom: 2px solid transparent;
  color: #383a3e;
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a[aria-current="page"] {
  border-color: var(--accent);
  color: var(--accent);
}

.language-switch {
  white-space: nowrap;
  color: var(--muted);
  font-size: 0.88rem;
}

.language-switch a[aria-current="true"] {
  color: var(--ink);
  font-weight: 650;
  text-decoration: none;
}

.page-shell {
  min-height: 68vh;
  padding-block: 3.6rem 5rem;
}

.page-heading {
  margin: 0 0 2rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
  color: var(--accent);
  font-family: Georgia, "Times New Roman", "Noto Serif SC", serif;
  font-size: clamp(2rem, 5vw, 2.7rem);
  font-weight: 500;
  line-height: 1.2;
}

h2,
h3 {
  color: #2d2e31;
  font-family: Georgia, "Times New Roman", "Noto Serif SC", serif;
  font-weight: 550;
  line-height: 1.35;
}

h2 {
  margin: 3.2rem 0 1.25rem;
  font-size: clamp(1.55rem, 3vw, 1.95rem);
}

h3 {
  margin: 1.5rem 0 0.65rem;
  font-size: 1.2rem;
}

p {
  margin: 0 0 1.1rem;
}

.lede {
  max-width: 850px;
  color: #3d4045;
  font-size: 1.08rem;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1.8fr);
  align-items: start;
  gap: clamp(2rem, 5vw, 4.5rem);
}

.profile-photo {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 3;
  border-radius: 3px;
  object-fit: cover;
  object-position: center;
  box-shadow: 0 9px 26px rgba(38, 31, 30, 0.12);
}

.eyebrow {
  margin: 0 0 0.35rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.intro-title {
  margin: 0 0 1.2rem;
  color: var(--ink);
  font-size: clamp(2.1rem, 5vw, 3.25rem);
}

.contact-block {
  margin: 1.4rem 0 0;
  color: #3c3f44;
  font-size: 0.93rem;
}

.contact-email,
.profile-links {
  margin-bottom: 0.3rem;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.7rem;
}

.profile-links a,
.paper-links a {
  font-size: 0.93rem;
  font-weight: 650;
}

.notice {
  margin-top: 2rem;
  padding: 1.2rem 1.35rem;
  border-left: 4px solid var(--accent);
  background: var(--notice);
}

.notice h2,
.notice h3 {
  margin-top: 0;
}

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

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

.news-item {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 1.5rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
}

.news-item:last-child {
  border-bottom: 1px solid var(--line);
}

.news-item time {
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  font-weight: 650;
}

.research-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.research-topics li {
  padding: 0.32rem 0.72rem;
  border: 1px solid #dfd2d2;
  border-radius: 999px;
  background: #fffafa;
  color: #5e282f;
  font-size: 0.9rem;
}

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

.publication-groups {
  counter-reset: publications;
}

.publication-group-title {
  margin: 2.2rem 0 0.65rem;
  color: var(--accent-dark);
  font-size: 1.25rem;
}

.publication-note {
  margin: -0.6rem 0 0.8rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.corresponding-mark {
  color: inherit;
  font-size: 0.8em;
  vertical-align: super;
}

.publication {
  counter-increment: publications;
  position: relative;
  padding: 1.45rem 0 1.45rem 3rem;
  border-top: 1px solid var(--line);
  overflow-wrap: anywhere;
}

.publication::before {
  content: counter(publications, decimal-leading-zero);
  position: absolute;
  top: 1.48rem;
  left: 0;
  color: var(--muted);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
}

.paper-title {
  margin: 0 0 0.3rem;
  color: #27282b;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.12rem;
  font-weight: 600;
  line-height: 1.5;
}

.authors,
.venue {
  margin: 0 0 0.24rem;
}

.authors {
  color: #3c3f44;
}

.self-author {
  color: var(--accent-dark);
  font-weight: 650;
}

.venue {
  color: var(--muted);
  font-size: 0.95rem;
}

.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 0.55rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.card {
  padding: 1.35rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
}

.student-card {
  display: grid;
  grid-template-columns: 160px 1fr;
  align-items: center;
  gap: 1.5rem;
  max-width: 560px;
}

.student-photo {
  display: block;
  width: 160px;
  height: 200px;
  aspect-ratio: 4 / 5;
  border-radius: 3px;
  object-fit: cover;
  object-position: 50% 42%;
}

.student-info h3 {
  margin-bottom: 0;
}

.card h2,
.card h3 {
  margin-top: 0;
}

.placeholder {
  color: #735f55;
  font-style: italic;
}

.detail-list {
  margin: 0;
}

.detail-list div {
  display: grid;
  grid-template-columns: 9.5rem 1fr;
  gap: 1rem;
  padding: 0.65rem 0;
  border-top: 1px solid var(--line);
}

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

.detail-list dt {
  font-weight: 650;
}

.detail-list dd {
  margin: 0;
}

.page-heading + .first-section h2 {
  margin-top: 0;
}

.course-list {
  margin: 0;
  padding: 0;
  border-bottom: 1px solid var(--line);
  list-style: none;
}

.course-row {
  display: grid;
  grid-template-columns: 10rem 1fr;
  gap: 1.5rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
}

.course-term {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.course-row a {
  font-weight: 650;
}

.course-language-note {
  display: block;
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.back-link {
  margin-bottom: 1.6rem;
}

.course-semester {
  margin-bottom: 0.35rem;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.course-overview {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0 1.5rem;
  margin: -0.5rem 0 2rem;
  border-bottom: 1px solid var(--line);
}

.course-overview div {
  padding: 0.8rem 0;
  border-top: 1px solid var(--line);
}

.course-overview dt {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 650;
}

.course-overview dd {
  margin: 0.15rem 0 0;
}

.course-toc {
  padding: 1rem 1.15rem;
  border-left: 3px solid var(--accent);
  background: var(--wash);
}

.course-toc p {
  margin: 0 0 0.35rem;
  font-weight: 650;
}

.course-toc ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.course-section {
  max-width: 920px;
  scroll-margin-top: 1.5rem;
}

.course-section h2 {
  margin-bottom: 0.9rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--line);
}

.course-alert {
  padding: 0.8rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--notice);
}

.course-detail-list,
.exam-details {
  margin: 0;
}

.course-detail-list div,
.exam-details div {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: 1rem;
  padding: 0.55rem 0;
  border-top: 1px solid var(--line);
}

.course-detail-list dt,
.exam-details dt {
  font-weight: 650;
}

.course-detail-list dd,
.exam-details dd {
  margin: 0;
}

.course-table-wrap {
  max-width: 760px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 4px;
}

.course-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  text-align: left;
}

.course-table th,
.course-table td {
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.course-table th {
  background: var(--wash);
  font-weight: 650;
}

.course-table tbody tr:last-child td {
  border-bottom: 0;
}

.email-link {
  overflow-wrap: anywhere;
}

.grading-formula {
  color: var(--accent-dark);
  font-family: Georgia, "Times New Roman", "Noto Serif SC", serif;
  font-size: clamp(1.2rem, 3vw, 1.55rem);
  font-weight: 600;
}

.assessment-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 720px;
  border: 1px solid var(--line);
  border-radius: 4px;
}

.assessment-summary div {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.8rem 1rem;
}

.assessment-summary div + div {
  border-left: 1px solid var(--line);
}

.assessment-summary strong {
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.exam-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.exam-panel {
  padding: 1rem 1.15rem;
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: 4px;
}

.exam-panel h3 {
  margin-top: 0;
}

.exam-panel .course-alert {
  margin: 0.8rem 0 0;
  font-size: 0.92rem;
}

.homework-table {
  min-width: 540px;
}

.homework-policy {
  max-width: 760px;
  margin-top: 1rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--wash);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 1.6rem;
  color: var(--muted);
  font-size: 0.84rem;
}

.footer-inner p {
  margin: 0;
}

@media (max-width: 820px) {
  .header-inner {
    grid-template-columns: 1fr auto;
    gap: 1rem;
    min-height: 84px;
    padding-block: 0.8rem;
  }

  .site-nav {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .site-nav ul {
    justify-content: flex-start;
    flex-wrap: nowrap;
    gap: 0;
    padding-bottom: 0.5rem;
  }

  .site-nav a {
    padding-inline: 0.65rem;
  }

  .site-nav li:first-child a {
    padding-left: 0;
  }

  .language-switch {
    grid-column: 2;
    grid-row: 1;
    text-align: right;
  }

  .intro-grid {
    grid-template-columns: minmax(180px, 250px) 1fr;
    gap: 2rem;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  .header-inner,
  .page-shell,
  .footer-inner {
    width: min(calc(100% - 2rem), var(--max-width));
  }

  .identity-affiliation {
    max-width: 220px;
  }

  .header-inner {
    column-gap: 0.65rem;
  }

  .site-nav a {
    padding-inline: 0.48rem;
    font-size: 0.9rem;
  }

  .page-shell {
    padding-block: 2.4rem 3.5rem;
  }

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

  .profile-photo {
    width: min(100%, 310px);
    margin-inline: auto;
  }

  .intro-title {
    font-size: 2.35rem;
  }

  .news-item,
  .detail-list div,
  .student-card,
  .course-row,
  .course-overview,
  .course-detail-list div,
  .exam-grid,
  .exam-details div {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .assessment-summary {
    grid-template-columns: 1fr;
  }

  .assessment-summary div + div {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .publication {
    padding-left: 2.4rem;
  }

  .footer-inner {
    display: block;
  }

  .footer-inner p + p {
    margin-top: 0.35rem;
  }
}

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