:root {
  --paper: #f7f8f4;
  --surface: #ffffff;
  --ink: #202124;
  --muted: #66706b;
  --line: #dfe5dc;
  --green: #2f6f5e;
  --green-dark: #1f4e42;
  --red: #b5463b;
  --blue: #2d5f9a;
  --gold: #b98b2d;
  --shadow: 0 18px 45px rgba(32, 33, 36, 0.08);
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

img,
video {
  max-width: 100%;
}

code {
  font-size: 0.92em;
  background: #eef2ec;
  padding: 0.12rem 0.32rem;
  border-radius: 5px;
}

.wrap {
  width: min(1120px, calc(100% - 36px));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 0.7rem 1rem;
  z-index: 10;
}

.skip-link:focus {
  left: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(247, 248, 244, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.header-inner,
.footer-grid,
.button-row,
.chip-row,
.research-tags {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.header-inner {
  justify-content: space-between;
  padding: 0.85rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
  object-position: top center;
  background: #e9eee7;
  border: 1px solid var(--line);
}

.brand small {
  display: block;
  color: var(--muted);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.main-nav a {
  color: var(--ink);
  padding: 0.5rem 0.72rem;
  border-radius: 999px;
}

.main-nav a[aria-current="page"] {
  background: #e6eee8;
  color: var(--green-dark);
}

.main-nav .language-link {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--red);
  font-weight: 760;
}

.hero {
  padding: 5.2rem 0 3rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 2.5rem;
  align-items: center;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(2.5rem, 7vw, 5.4rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.hero h1 span {
  display: block;
  color: var(--green);
}

.lead,
.page-hero p {
  color: var(--muted);
  font-size: 1.12rem;
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--red);
  font-weight: 760;
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.62rem 0.92rem;
  border-radius: 7px;
  border: 1px solid var(--line);
  color: var(--ink);
  font-weight: 700;
  background: var(--surface);
}

.button:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.button.primary {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

.button.ghost {
  background: rgba(255, 255, 255, 0.6);
}

.chip,
.pub-year {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  background: #edf3ec;
  color: var(--green-dark);
  font-size: 0.78rem;
  font-weight: 760;
}

.research-tags {
  margin-top: 1.2rem;
}

.profile-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
}

.profile-panel img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center 18%;
  border-radius: 6px;
  background: #e9eee7;
}

.profile-panel h2 {
  margin: 1rem 0 0.1rem;
  font-size: 1.25rem;
}

.profile-panel p {
  margin: 0 0 0.4rem;
  color: var(--muted);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  padding-bottom: 3rem;
}

.stat {
  border-top: 3px solid var(--gold);
  padding: 1rem 0 0;
}

.stat strong {
  display: block;
  font-size: 2.2rem;
  line-height: 1;
}

.stat span {
  color: var(--muted);
}

.band {
  background: #eef2ec;
  border-block: 1px solid var(--line);
  padding: 3.5rem 0;
}

.section-heading {
  margin-bottom: 1.2rem;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  line-height: 1.12;
}

.section-heading.tight {
  margin-bottom: 0.9rem;
}

.theme-grid,
.media-grid,
.two-column,
.resource-grid,
.cv-grid {
  display: grid;
  gap: 1.2rem;
}

.theme-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.theme,
.media-card,
.pub-card,
.resource-card,
.external-panel,
.prose-block {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.theme {
  padding: 1.1rem;
}

.theme h3,
.media-card h3,
.pub-card h3,
.conference-row h3 {
  margin: 0 0 0.35rem;
  line-height: 1.28;
  font-size: 1.08rem;
}

.theme p,
.media-card p,
.pub-card p,
.conference-row p {
  margin: 0;
  color: var(--muted);
}

.two-column {
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.8fr);
  padding: 3.5rem 0;
}

.content-section {
  padding: 3rem 0;
}

.content-section + .content-section {
  border-top: 1px solid var(--line);
}

.content-section.education-first {
  padding-top: 1rem;
}

.prose-section ul,
.prose-block ul {
  margin: 0;
  padding-left: 1.2rem;
}

.prose-section li,
.prose-block li {
  margin-bottom: 0.65rem;
}

.prose-section span,
.resource-card p {
  color: var(--muted);
}

.pub-list {
  display: grid;
  gap: 0.85rem;
}

.pub-card {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem;
}

.pub-card.compact {
  grid-template-columns: 62px minmax(0, 1fr);
}

.pub-year {
  align-self: start;
  justify-content: center;
  background: #f5eadb;
  color: #765514;
}

.pub-cn {
  margin-top: 0.25rem !important;
  color: var(--green-dark) !important;
}

.pub-meta {
  margin-top: 0.3rem !important;
}

.chip-row {
  margin-top: 0.6rem;
}

.card-actions {
  margin-top: 0.7rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
}

.text-link {
  display: inline-block;
  font-weight: 760;
}

.timeline {
  display: grid;
  gap: 0.8rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 116px minmax(0, 1fr);
  gap: 0.8rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--line);
}

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

.timeline-item p,
.timeline-item small {
  margin: 0;
  color: var(--muted);
}

.timeline-date {
  color: var(--red);
  font-weight: 760;
  font-size: 0.85rem;
}

.media-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding-bottom: 3.5rem;
}

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

.media-card {
  overflow: hidden;
}

.media-thumb {
  display: grid;
  place-items: end start;
  min-height: 168px;
  padding: 1rem;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(47, 111, 94, 0.9), rgba(45, 95, 154, 0.78)),
    linear-gradient(45deg, #2f6f5e, #b5463b);
  background-position: center;
  background-size: cover;
}

.media-thumb:hover {
  text-decoration: none;
}

.media-thumb span {
  background: rgba(32, 33, 36, 0.72);
  padding: 0.28rem 0.55rem;
  border-radius: 999px;
  font-weight: 760;
  font-size: 0.8rem;
}

.media-copy {
  padding: 1rem;
}

.page-hero {
  padding: 4.2rem 0 2.1rem;
}

.conference-list {
  display: grid;
  gap: 0.8rem;
}

.conference-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.conference-row strong {
  color: var(--red);
}

.conference-row small {
  color: var(--green-dark);
  font-weight: 760;
}

.resource-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding-bottom: 4rem;
}

.resource-card {
  padding: 1rem;
  display: grid;
  gap: 1rem;
}

.resource-card h3 {
  margin: 0 0 0.35rem;
  line-height: 1.25;
}

.resource-card p {
  margin: 0.35rem 0 0;
}

.resource-files {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 0.55rem;
  margin: 0.2rem 0 0;
  padding: 0;
}

.resource-link {
  display: flex;
  align-items: center;
  min-height: 42px;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--green-dark);
  font-weight: 760;
  line-height: 1.25;
}

.resource-link:hover {
  border-color: var(--green);
  text-decoration: none;
}

.prose-block {
  margin-block: 3rem;
  padding: 1.4rem;
}

.media-detail {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 1.5rem;
  padding-bottom: 4rem;
}

.media-detail video {
  width: 100%;
  border-radius: var(--radius);
  background: #101413;
}

.media-detail aside,
.external-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
  align-self: start;
}

.media-detail dt {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 760;
  text-transform: uppercase;
}

.media-detail dd {
  margin: 0 0 0.8rem;
}

.cv-grid {
  grid-template-columns: 330px minmax(0, 1fr);
  padding-bottom: 4rem;
}

.cv-sidebar {
  position: sticky;
  top: 88px;
  align-self: start;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
}

.cv-main {
  display: grid;
  gap: 2rem;
}

.cv-main section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem;
}

.cv-main h2,
.cv-sidebar h2 {
  margin: 0 0 0.8rem;
}

.cv-main li {
  margin-bottom: 0.65rem;
}

.cv-main span {
  color: var(--muted);
}

.section-link {
  margin-top: 1rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.6rem 0;
  color: var(--muted);
}

.root-choice {
  min-height: 100vh;
  display: grid;
  place-content: center;
  text-align: center;
  gap: 1rem;
}

.root-choice h1 {
  margin: 0;
  font-size: clamp(2.3rem, 7vw, 4.8rem);
}

.footer-grid {
  justify-content: space-between;
}

@media (max-width: 860px) {
  .hero-grid,
  .two-column,
  .media-detail,
  .cv-grid {
    grid-template-columns: 1fr;
  }

  .profile-panel {
    max-width: 430px;
  }

  .stats-grid,
  .theme-grid,
  .media-grid,
  .media-grid.wide,
  .resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cv-sidebar {
    position: static;
  }
}

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

  .header-inner {
    align-items: flex-start;
  }

  .main-nav {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 0.2rem;
  }

  .hero {
    padding-top: 3rem;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 2.45rem;
  }

  .stats-grid,
  .theme-grid,
  .media-grid,
  .media-grid.wide,
  .resource-grid {
    grid-template-columns: 1fr;
  }

  .pub-card,
  .pub-card.compact,
  .timeline-item,
  .conference-row {
    grid-template-columns: 1fr;
  }
}

/* ---------- Research products ---------- */
.product-card {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: center;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.product-shot {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper);
}

.product-shot img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform 0.2s ease;
}

.product-shot:hover img {
  transform: scale(1.015);
}

.product-body h3 {
  margin: 0.2rem 0 0.5rem;
  font-size: 1.35rem;
  line-height: 1.25;
}

.product-tagline {
  margin: 0 0 0.75rem;
  color: var(--ink);
}

.product-points {
  margin: 0 0 0.9rem;
  padding-left: 1.1rem;
  color: var(--muted);
}

.product-points li {
  margin: 0.3rem 0;
}

.product-body .research-tags {
  margin-bottom: 1rem;
}

.product-list {
  display: grid;
  gap: 1.5rem;
  padding-bottom: 3rem;
}

.product-embed {
  display: grid;
  gap: 0.4rem;
}

.product-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.product-embed iframe {
  width: 100%;
  height: 82vh;
  min-height: 560px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

@media (max-width: 860px) {
  .product-card {
    grid-template-columns: 1fr;
  }

  .product-embed iframe {
    height: 70vh;
    min-height: 480px;
  }
}