:root {
  --bg: #f6f1e8;
  --paper: #fbf7f1;
  --ink: #162033;
  --muted: #4a433c;
  --line: #d9d0c3;
  --line-strong: #162033;
  --red: #8d2436;
  --sans: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Liberation Sans", Arial, "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  --serif: "Iowan Old Style", Palatino, "Palatino Linotype", "Liberation Serif", "Songti SC", "Noto Serif CJK SC", "Times New Roman", "Source Han Serif SC", "Microsoft YaHei", serif;
  --wrap: 1080px;
  --gutter: 24px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html:not([data-lang]) .en,
html[data-lang="zh"] .en {
  display: none;
}

html[data-lang="en"] .zh {
  display: none;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  height: auto;
  border: 0;
}

a {
  color: inherit;
}

a:hover {
  color: var(--red);
}

:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 12px;
  top: 8px;
  transform: translateY(-140%);
  background: var(--ink);
  color: var(--bg);
  padding: 8px 12px;
  z-index: 5;
  text-decoration: none;
  font-family: var(--sans);
}

.skip:focus {
  transform: none;
}

.topbar {
  height: 4px;
  background: var(--red);
}

.wrap {
  width: min(var(--wrap), calc(100% - (var(--gutter) * 2)));
  margin-inline: auto;
}

.mast {
  padding: 18px 0 0;
}

.mast-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
}

.mast-row > *,
.papers li > div,
.research li,
.profile > *,
.closing > *,
.card {
  min-width: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.wordmark {
  margin-right: auto;
  text-decoration: none;
  color: var(--ink);
  min-width: 0;
}

.wordmark:hover {
  color: var(--ink);
}

.wordmark-en {
  display: block;
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  line-height: 1.2;
}

.wordmark-name {
  display: block;
  font-size: 1.35rem;
  line-height: 1.25;
  font-weight: 600;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  font-family: var(--sans);
  font-size: 0.92rem;
}

.nav a {
  text-decoration: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav a:hover {
  text-decoration: underline;
  text-underline-offset: 0.28em;
}

.lang {
  display: inline-flex;
  border: 1px solid var(--line-strong);
  font-family: var(--sans);
}

.lang button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 0.86rem;
  min-height: 44px;
  padding: 0 12px;
  cursor: pointer;
}

.lang button + button {
  box-shadow: inset 1px 0 0 var(--line-strong);
}

html[data-lang="zh"] #lang-zh,
html[data-lang="en"] #lang-en,
html:not([data-lang]) #lang-zh {
  background: var(--ink);
  color: var(--bg);
}

.mast-rule {
  margin-top: 8px;
  border: 0;
  border-top: 1px solid var(--ink);
  height: 0;
}

.mast-rule span {
  display: block;
  margin-top: 2px;
  border-top: 3px solid var(--ink);
  height: 0;
}

.hero {
  padding: 48px 0 28px;
}

.eyebrow {
  margin: 0 0 14px;
  font-family: var(--sans);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--red);
}

.hero h1 {
  margin: 0;
  max-width: 16em;
  font-size: clamp(2rem, 4.4vw, 3.35rem);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.02em;
}

.zh-break {
  display: none;
}

@media (max-width: 640px) {
  .zh-break {
    display: unset;
  }
}

.lede {
  margin: 18px 0 0;
  max-width: 40rem;
  font-size: 1.15rem;
  line-height: 1.65;
  color: var(--muted);
}

.section {
  padding: 28px 0 8px;
}

.section h2 {
  margin: 0 0 18px;
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1.3;
}

.profile {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 40px 48px;
  align-items: start;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}

.portrait {
  margin: 0;
}

.portrait img {
  display: block;
  width: 220px;
  max-width: 100%;
  background: #d5d0c8;
  border: 1px solid var(--line);
}

.portrait figcaption {
  margin-top: 10px;
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--ink);
}

.role {
  margin: 0 0 14px;
  font-size: 1.05rem;
}

.bio {
  margin: 0 0 16px;
  max-width: 42rem;
}

.text-link {
  font-family: var(--sans);
  font-size: 0.95rem;
}

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

.research li {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.research h3 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.45;
}

.idx {
  font-family: var(--sans);
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
  color: var(--red);
}

.note {
  margin: -6px 0 8px;
  color: var(--muted);
  font-size: 0.98rem;
}

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

.papers li {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 8px 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.year {
  margin: 0;
  font-family: var(--sans);
  font-variant-numeric: tabular-nums;
  font-size: 0.95rem;
  color: var(--red);
}

.journal {
  margin: 0;
  font-family: var(--sans);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.title {
  margin: 4px 0 0;
  font-size: 1.08rem;
  line-height: 1.45;
}

.authors {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.fine {
  margin: 12px 0 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.82rem;
}

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-height: 100%;
  padding: 20px 20px 18px;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  text-decoration: none;
  color: var(--ink);
}

.card:hover {
  color: var(--ink);
  background: #fffdf8;
}

.card:hover .card-url {
  color: var(--red);
}

.card-kicker {
  margin: 0 0 10px;
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--red);
}

.card h3 {
  margin: 0;
  font-size: 1.45rem;
  font-weight: 600;
  line-height: 1.25;
}

.card-desc {
  margin: 8px 0 16px;
  color: var(--muted);
}

.card-url {
  margin-top: auto;
  font-family: var(--sans);
  font-size: 0.88rem;
  overflow-wrap: anywhere;
}

.closing {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
  gap: 36px 56px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}

address {
  font-style: normal;
}

.contact-line {
  margin: 0 0 10px;
  overflow-wrap: anywhere;
}

.site-footer {
  margin-top: 36px;
  padding: 22px 0 36px;
  border-top: 3px solid var(--ink);
  font-family: var(--sans);
  font-size: 0.88rem;
  color: var(--muted);
}

.site-footer p {
  margin: 0 0 6px;
}

.footer-name {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.05rem;
}

@media (max-width: 760px) {
  :root {
    --gutter: 18px;
  }

  .hero {
    padding-top: 32px;
  }

  .profile,
  .cards,
  .closing,
  .papers li,
  .research li {
    grid-template-columns: 1fr;
  }

  .portrait img {
    width: min(220px, 68vw);
  }

  .papers li {
    gap: 4px;
  }

  .research li {
    gap: 2px;
    padding: 14px 0;
  }
}

@media (max-width: 380px) {
  :root {
    --gutter: 16px;
  }

  .wordmark-name {
    font-size: 1.15rem;
  }

  .hero h1 {
    font-size: 1.85rem;
  }

  .lang button {
    padding: 0 10px;
  }
}

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

@media print {
  .topbar,
  .nav,
  .lang,
  .skip {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  .card,
  .profile,
  .closing {
    break-inside: avoid;
  }

  a {
    text-decoration: underline;
  }
}