:root {
  --bg: #ffffff;
  --ink: #232320;
  --muted: #686761;
  --line: #dedbd2;
  --soft: #f6f4ee;
  --soft-green: #eef6f3;
  --accent: #176b5c;
  --accent-warm: #c7673d;
  --gold: #c69a2f;
  --link: #0b658a;
  --max: 1160px;
  --nav-height: 72px;
  --sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --serif: Georgia, "Times New Roman", "Songti SC", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--accent-warm);
}

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

.container {
  width: min(100% - 48px, var(--max));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.nav {
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.nav-brand {
  color: var(--ink);
  display: grid;
  gap: 1px;
  min-width: max-content;
}

.brand-title {
  font-family: var(--serif);
  font-size: 28px;
  line-height: 1;
}

.brand-sub {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.2;
}

.nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 23px;
}

.nav-menu a {
  color: var(--ink);
  display: inline-block;
  font-size: 14px;
  line-height: 1.3;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-size: 28px;
  cursor: pointer;
}

.hero {
  position: relative;
  min-height: 520px;
  overflow: hidden;
  color: #fff;
  background: #1d302d;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url("../images/hero-landscape.svg");
  background-size: cover;
  background-position: center;
  transform: scale(1.02);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(20, 28, 25, 0.48);
}

.hero-inner {
  position: relative;
  z-index: 1;
  min-height: 520px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 48px 0 72px;
}

.hero-kicker {
  margin: 0 0 18px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.86);
}

.hero h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: 76px;
  line-height: 1;
  font-weight: 500;
}

.hero-sub {
  margin: 22px 0 0;
  max-width: 720px;
  font-size: 22px;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.94);
}

.section {
  padding: 84px 0;
}

.section-alt {
  background: var(--soft);
}

.section-intro {
  padding-top: 72px;
}

.section-eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

.section-title {
  margin: 0 0 18px;
  max-width: 820px;
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 500;
  line-height: 1.18;
}

.section-lead {
  max-width: 790px;
  margin: 0 0 42px;
  color: var(--muted);
  font-size: 18px;
}

.text-link {
  font-weight: 700;
  border-bottom: 1px solid currentColor;
}

.home-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 72px;
  align-items: start;
}

.home-layout p {
  max-width: 780px;
}

.home-aside {
  border-top: 4px solid var(--accent);
  background: var(--soft-green);
  padding: 26px;
}

.home-aside h2 {
  margin: 0 0 14px;
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 500;
}

.home-aside p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 15px;
}

.public-note {
  border-left: 3px solid var(--gold);
  padding-left: 18px;
  color: var(--muted);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 26px;
}

.project-card {
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 300px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  transition: transform 160ms ease, border-color 160ms ease;
}

.project-card:hover {
  color: var(--ink);
  border-color: var(--accent);
  transform: translateY(-3px);
}

.project-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: contain;
  background: #fafaf7;
  border-bottom: 1px solid var(--line);
  padding: 10px;
}

.project-card span {
  display: flex;
  align-items: center;
  min-height: 74px;
  padding: 20px 22px;
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.2;
}

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 76px;
  align-items: start;
}

.news-list,
.compact-pub-list,
.clean-list,
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.news-list li {
  display: grid;
  grid-template-columns: 82px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.news-list time {
  color: var(--accent);
  font-weight: 700;
}

.news-list p {
  margin: 0;
}

.compact-pub-list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.compact-pub-list span {
  display: block;
  margin-bottom: 4px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
}

.compact-pub-list a {
  color: var(--ink);
  font-weight: 700;
  line-height: 1.45;
}

.compact-pub-list a:hover {
  color: var(--link);
}

.page-header {
  background: var(--soft);
  border-bottom: 1px solid var(--line);
  padding: 74px 0 58px;
}

.page-header h1 {
  max-width: 900px;
  margin: 0 0 14px;
  font-family: var(--serif);
  font-size: 50px;
  line-height: 1.08;
  font-weight: 500;
}

.page-header p:last-child {
  max-width: 780px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.intro-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
  gap: 58px;
  align-items: center;
}

.intro-panel h2 {
  margin: 0 0 16px;
  font-family: var(--serif);
  font-size: 36px;
  font-weight: 500;
  line-height: 1.15;
}

.intro-panel img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
  background: #fafaf7;
}

.research-section {
  padding: 86px 0;
}

.research-row {
  display: grid;
  grid-template-columns: minmax(320px, 0.92fr) minmax(0, 1.08fr);
  gap: 62px;
  align-items: center;
}

.research-row.reverse {
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
}

.research-row.reverse figure {
  order: 2;
}

.research-row h2 {
  margin: 0 0 16px;
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 500;
  line-height: 1.16;
}

.research-row p {
  margin: 0 0 16px;
}

.research-row figure {
  margin: 0;
}

.research-row figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: contain;
  background: #fff;
  border: 1px solid var(--line);
  padding: 12px;
}

.research-row figcaption {
  margin-top: 9px;
  color: var(--muted);
  font-size: 13px;
}

.citation-line {
  color: var(--muted);
  font-size: 14px;
}

.publication-list {
  max-width: 980px;
}

.publication-list > h2 {
  margin: 54px 0 10px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--line);
  color: var(--accent);
  font-family: var(--serif);
  font-size: 34px;
  font-weight: 500;
}

.publication-list > h2:first-child {
  margin-top: 0;
}

.pub-item {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 30px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.pub-year-label {
  align-self: start;
  color: var(--accent);
  background: var(--soft-green);
  border: 1px solid #d5e5df;
  padding: 7px 10px;
  font-size: 12px;
  font-weight: 700;
  text-align: center;
}

.pub-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.42;
}

.pub-item h3 a {
  color: var(--ink);
}

.pub-item h3 a:hover {
  color: var(--link);
}

.pub-item p {
  margin: 0 0 6px;
  color: var(--muted);
}

.pub-meta {
  font-size: 14px;
}

.timeline {
  max-width: 920px;
}

.timeline li {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 34px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.timeline time {
  color: var(--accent);
  font-weight: 700;
}

.timeline h2 {
  margin: 0 0 8px;
  font-size: 22px;
  line-height: 1.32;
}

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

.people-profile {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

.portrait {
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  background: var(--soft-green);
  border: 1px solid #d5e5df;
  color: var(--accent);
  font-family: var(--serif);
  font-size: 70px;
}

.people-profile h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 500;
  line-height: 1.2;
}

.role-line {
  margin: 8px 0 18px;
  color: var(--accent);
  font-weight: 700;
}

.people-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.person-card {
  background: #fff;
  border: 1px solid var(--line);
  padding: 24px;
}

.person-token {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  margin-bottom: 24px;
  background: var(--soft);
  color: var(--accent);
  font-family: var(--serif);
  font-size: 24px;
}

.person-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.25;
}

.person-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.clean-list li {
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.join-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 62px;
  align-items: start;
}

.join-layout article {
  max-width: 760px;
  padding-bottom: 28px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.join-layout article h2,
.apply-box h2,
.contact-grid h2 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 500;
  line-height: 1.18;
}

.join-layout article p {
  margin: 0 0 12px;
}

.apply-box {
  position: sticky;
  top: 96px;
  background: var(--soft-green);
  border-top: 4px solid var(--accent);
  padding: 26px;
}

.apply-box p {
  margin: 0 0 16px;
}

.apply-box ul {
  margin: 0;
  padding-left: 20px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 48px 70px;
}

.contact-grid article {
  padding-top: 22px;
  border-top: 3px solid var(--line);
}

.contact-grid p {
  margin: 0 0 12px;
}

.site-footer {
  background: #232320;
  color: #e7e3d8;
  padding: 52px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(160px, 0.65fr) minmax(180px, 0.7fr);
  gap: 52px;
}

.footer-title {
  margin-bottom: 10px;
  font-family: var(--serif);
  font-size: 28px;
}

.site-footer p {
  margin: 0;
  color: #bbb6aa;
  font-size: 14px;
}

.site-footer h2 {
  margin: 0 0 12px;
  font-size: 13px;
  color: #fff;
  text-transform: uppercase;
}

.site-footer a {
  display: block;
  color: #d9d3c5;
  margin: 0 0 8px;
  font-size: 14px;
}

.site-footer a:hover {
  color: #fff;
}

.footer-bottom {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid #4a4942;
  color: #aaa397;
  font-size: 13px;
}

@media (max-width: 980px) {
  .nav-toggle {
    display: block;
  }

  .nav-menu {
    display: none;
    position: absolute;
    inset: var(--nav-height) 0 auto 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 10px 24px 18px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-menu a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
  }

  .home-layout,
  .two-column,
  .intro-panel,
  .research-row,
  .research-row.reverse,
  .people-profile,
  .join-layout,
  .contact-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .research-row.reverse figure {
    order: 0;
  }

  .apply-box {
    position: static;
  }

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

@media (max-width: 640px) {
  .container {
    width: min(100% - 32px, var(--max));
  }

  .hero,
  .hero-inner {
    min-height: 420px;
  }

  .hero h1 {
    font-size: 52px;
  }

  .hero-sub {
    font-size: 18px;
  }

  .section,
  .research-section {
    padding: 58px 0;
  }

  .page-header {
    padding: 54px 0 42px;
  }

  .page-header h1,
  .section-title,
  .research-row h2 {
    font-size: 34px;
  }

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

  .project-card {
    min-height: 0;
  }

  .news-list li,
  .timeline li,
  .pub-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .pub-year-label {
    width: max-content;
  }
}