:root {
  --bg: #FCFCFA;
  --text: #1A1A1A;
  --secondary: #6B6B6B;
  --accent: #1A5FB4;
  --rule: #E4E2DA;
  --serif: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
}

::selection {
  background: #EAE4D3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 52px 24px 96px;
}

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

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

/* Affiliation brand marks — brand colors for instant recognition */
.brand {
  display: inline-block;
  width: 0.95em;
  height: 0.95em;
  vertical-align: -0.12em;
  margin-right: 0.18em;
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
}
.brand-apple { background-color: #000000; -webkit-mask-image: url(images/logos/apple.svg); mask-image: url(images/logos/apple.svg); }
.brand-amazon { background-color: #FF9900; -webkit-mask-image: url(images/logos/amazon.svg); mask-image: url(images/logos/amazon.svg); }
.brand-bytedance { background-color: #3C8CFF; -webkit-mask-image: url(images/logos/bytedance.svg); mask-image: url(images/logos/bytedance.svg); }
.brand-img { height: 0.98em; width: auto; vertical-align: -0.15em; margin-right: 0.16em; }

/* Header */
header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 36px;
}

h1 {
  font-size: 2.1rem;
  font-weight: 700;
  margin: 0 0 4px;
}

.role {
  margin: 0 0 10px;
  color: var(--secondary);
}

.contact-links {
  margin: 0;
  font-size: 0.95rem;
}

/* Portrait — hovering reveals Oreo */
.portrait-wrap {
  flex-shrink: 0;
  text-align: center;
}

.portrait-box {
  position: relative;
  width: 124px;
  height: 124px;
}

.portrait-box img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 6px;
}

.portrait-box .me {
  transition: opacity 0.3s ease;
}

.portrait-box:hover .me {
  opacity: 0;
}

.portrait-hint {
  margin: 6px 0 0;
  font-size: 0.78rem;
  color: var(--secondary);
  font-style: italic;
}

/* Sections */
section {
  margin-bottom: 42px;
}

h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0 0 14px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--rule);
}

p {
  margin: 0 0 14px;
}

section > p:last-child {
  margin-bottom: 0;
}

/* News — fixed date column so wrapped lines stay aligned */
.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.news-list li {
  display: grid;
  grid-template-columns: 82px 1fr;
  column-gap: 14px;
  margin-bottom: 9px;
}

.news-date {
  color: var(--secondary);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* Publications */
.pub-note {
  color: var(--secondary);
  font-size: 0.95rem;
}

.group-label {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--secondary);
  margin: 26px 0 12px;
}

.pub {
  margin-bottom: 18px;
}

.pub-title {
  font-weight: 700;
}

.pub-authors {
  color: var(--secondary);
  font-size: 0.92rem;
}

.pub-authors strong {
  color: var(--text);
  font-weight: 700;
}

.pub-venue {
  font-size: 0.92rem;
  color: var(--secondary);
}

.pub-venue strong {
  color: var(--text);
}

/* Featured Work — left accent rule sets these apart from the plain pub list */
.feat {
  border-left: 2px solid var(--accent);
  padding-left: 16px;
  margin-bottom: 20px;
}

.feat-tag {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 2px;
}

.feat-title {
  font-weight: 700;
  font-size: 1.05rem;
}

.feat-desc {
  margin: 2px 0 4px;
}

.feat-meta {
  font-size: 0.9rem;
  color: var(--secondary);
}

.feat-meta strong {
  color: var(--text);
  font-weight: 700;
}

/* Experience — one research line under each role; date right-aligned */
.exp-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.exp-list li {
  margin-bottom: 14px;
}

.exp-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px 18px;
  flex-wrap: wrap;
}

.exp-meta {
  color: var(--secondary);
  font-size: 0.9rem;
  white-space: nowrap;
}

.exp-desc {
  color: var(--secondary);
  font-size: 0.93rem;
  margin-top: 1px;
}

/* More news — native disclosure, keyboard-accessible by default */
.more-news {
  margin-top: 12px;
}

.more-news summary {
  cursor: pointer;
  color: var(--accent);
  font-size: 0.95rem;
  width: fit-content;
}

.more-news summary:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.more-news .news-list {
  margin-top: 10px;
}

/* Lists */
.plain-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.plain-list li {
  margin-bottom: 7px;
}

/* Placeholders — visible scaffolding to fill in, remove class when done */
.placeholder {
  background: #F6EDD4;
  color: #6B5A1E;
  border-radius: 3px;
  padding: 0 4px;
  font-size: 0.93em;
}

/* Footer */
footer {
  margin-top: 56px;
  color: var(--secondary);
  font-size: 0.9rem;
}

footer p {
  margin: 0;
}

/* Mobile */
@media (max-width: 600px) {
  body {
    font-size: 15.5px;
  }

  main {
    padding: 32px 18px 72px;
  }

  /* Show the photo on mobile; hover doesn't fire on touch, so the
     profile image stays on top and the Oreo hint is hidden. */
  header {
    flex-direction: column-reverse;
    align-items: flex-start;
    gap: 18px;
  }

  .portrait-box {
    width: 96px;
    height: 96px;
  }

  .portrait-box:hover .me {
    opacity: 1;
  }

  .portrait-hint {
    display: none;
  }

  .news-list li {
    grid-template-columns: 1fr;
    row-gap: 0;
    margin-bottom: 12px;
  }

  .news-date {
    font-size: 0.88rem;
  }
}