/* Wenjia Ye — personal page */

:root {
  --bg: #faf9f6;
  --surface: #ffffff;
  --text: #1f1d1a;
  --muted: #625e57;
  --border: #e6e2da;
  --tint: rgba(31, 29, 26, 0.055);
  --accent: #2748b8;
  --accent-soft: #eaeefb;
  --gold: #8f5b00;
  --gold-soft: #fbf1db;
  --shadow: 0 10px 30px -14px rgba(31, 29, 26, 0.35);

  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131416;
    --surface: #1b1c1f;
    --text: #ebe9e5;
    --muted: #a6a29b;
    --border: #2c2e33;
    --tint: rgba(235, 233, 229, 0.07);
    --accent: #93abff;
    --accent-soft: #1d2440;
    --gold: #e8b65a;
    --gold-soft: #2d2416;
    --shadow: 0 10px 30px -14px rgba(0, 0, 0, 0.8);
  }
}

/* ---------- Base ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent);
  text-underline-offset: 3px;
  transition: color .15s, text-decoration-color .15s, border-color .15s, background-color .15s;
}

a:hover { text-decoration-color: currentColor; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

svg.icon {
  width: 16px;
  height: 16px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.skip {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 100;
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
}
.skip:focus { top: 12px; }

/* ---------- Layout ---------- */

.page {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 16px;
}

@media (min-width: 900px) {
  .page {
    display: grid;
    grid-template-columns: 252px minmax(0, 1fr);
    gap: 80px;
    padding: 0 40px;
  }
  .side {
    position: sticky;
    top: 0;
    align-self: start;
    max-height: 100vh;
    overflow-y: auto;
    padding: 64px 0 32px;
    scrollbar-width: none;
  }
  .side::-webkit-scrollbar { display: none; }
  main { padding: 64px 0 24px; }
}

@media (max-width: 899px) {
  /* Let the profile and the nav sit directly in the page flow,
     so the nav can stick to the top for the whole page. */
  .side { display: contents; }
}

/* ---------- Profile ---------- */

.avatar {
  display: block;
  width: 168px;
  height: 168px;
  object-fit: cover;
  object-position: 50% 30%;
  border-radius: 28px;
  background: var(--tint);
  box-shadow: 0 0 0 1px var(--border), var(--shadow);
}

.name {
  margin: 28px 0 2px;
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.015em;
}

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

.links {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.links a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 5px 0;
  color: var(--muted);
  font-size: 15px;
  text-decoration: none;
}
.links a:hover { color: var(--accent); }

.interests { margin-top: 26px; }

.interests-label {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.interests ul + .interests-label { margin-top: 16px; }

.interests ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.interests li {
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--tint);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

@media (max-width: 899px) {
  .profile {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    column-gap: 18px;
    padding: 36px 0 22px;
  }
  .avatar {
    grid-row: 1 / span 2;
    width: 92px;
    height: 92px;
    border-radius: 22px;
  }
  .name {
    margin: 0;
    font-size: 32px;
    align-self: end;
  }
  .affil { align-self: start; }
  .links {
    grid-column: 1 / -1;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
  }
  .links a {
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    color: var(--text);
    font-size: 14px;
    gap: 7px;
  }
  .links a:hover { border-color: var(--accent); }
  .interests {
    grid-column: 1 / -1;
    margin-top: 20px;
  }
}

/* ---------- Section nav ---------- */

.toc {
  display: flex;
  flex-direction: column;
  margin-top: 36px;
  border-left: 1px solid var(--border);
}

.toc a {
  margin-left: -1px;
  padding: 5px 0 5px 16px;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}
.toc a:hover { color: var(--text); }
.toc a[aria-current] {
  color: var(--text);
  font-weight: 500;
  border-left-color: var(--accent);
}

@media (max-width: 899px) {
  .toc {
    position: sticky;
    top: 0;
    z-index: 10;
    flex-direction: row;
    gap: 4px;
    margin: 0 -16px;
    padding: 10px 16px;
    border-left: 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    background: color-mix(in srgb, var(--bg) 86%, transparent);
    -webkit-backdrop-filter: saturate(160%) blur(12px);
    backdrop-filter: saturate(160%) blur(12px);
    overflow-x: auto;
    scrollbar-width: none;
  }
  .toc::-webkit-scrollbar { display: none; }
  .toc a {
    margin: 0;
    padding: 5px 12px;
    border: 0;
    border-radius: 999px;
    white-space: nowrap;
  }
  .toc a[aria-current] {
    background: var(--accent-soft);
    color: var(--accent);
  }
}

/* ---------- Sections ---------- */

section {
  scroll-margin-top: 32px;
}

section + section {
  margin-top: 56px;
  padding-top: 48px;
  border-top: 1px solid var(--border);
}

@media (max-width: 899px) {
  main { padding: 36px 0 8px; }
  section { scroll-margin-top: 72px; }
  section + section {
    margin-top: 44px;
    padding-top: 36px;
  }
}

h2 {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

/* Small uppercase group labels with a hairline, e.g. year headings */
.label {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 32px 0 4px;
  color: var(--muted);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-variant-numeric: tabular-nums;
}
.label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}
h2 + .label,
h2 + div > .label:first-child { margin-top: 8px; }

.lead {
  max-width: 64ch;
  margin: 0 0 18px;
  font-family: var(--serif);
  font-size: 20.5px;
  line-height: 1.6;
}
.lead:last-child { margin-bottom: 0; }
.label + .lead { margin-top: 12px; }

@media (max-width: 899px) {
  h2 { font-size: 27px; }
  .lead { font-size: 19px; }
}

/* ---------- Current work ---------- */

.current {
  margin-top: 24px;
  padding: 18px 24px 8px;
  border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
  border-radius: 14px;
  background: var(--accent-soft);
}

.current-label {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.current-label::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}

.current-list {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  margin: 0;
}

.current-list dt,
.current-list dd {
  margin: 0;
  padding: 12px 0;
  border-top: 1px solid color-mix(in srgb, var(--accent) 16%, transparent);
}
.current-list dt:first-of-type,
.current-list dt:first-of-type + dd { border-top: 0; }

.current-list dt {
  padding-right: 20px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.35;
}

.current-list dd {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

@media (max-width: 599px) {
  .current { padding: 16px 18px 6px; }
  .current-list { grid-template-columns: 1fr; }
  .current-list dt { padding-bottom: 2px; }
  .current-list dd {
    padding-top: 0;
    border-top: 0;
  }
}

/* ---------- Research themes ---------- */

.themes {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

/* An odd card out at the end spans the full row */
.theme:last-child:nth-child(odd) { grid-column: 1 / -1; }

.theme {
  display: flex;
  flex-direction: column;
  padding: 18px 20px 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
}

.theme-title {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.3;
}

.theme-text {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

.theme-papers {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: auto 0 0;
  padding-top: 14px;
}

.theme-papers .venue {
  margin: 0;
  text-decoration: none;
}
.theme-papers .venue:hover {
  background: var(--accent);
  color: var(--bg);
}

@media (max-width: 699px) {
  .themes { grid-template-columns: 1fr; }
}

/* ---------- Publications ---------- */

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

.pub {
  padding: 16px 0;
  scroll-margin-top: 24px;
}

/* Briefly highlight a paper reached from a research-theme link */
.pub:target { animation: target-flash 2.4s ease-out; }
@keyframes target-flash {
  0%, 30% { background: var(--accent-soft); box-shadow: -12px 0 0 var(--accent-soft), 12px 0 0 var(--accent-soft); }
  100% { background: transparent; box-shadow: none; }
}

@media (max-width: 899px) {
  .pub { scroll-margin-top: 72px; }
}

.pub-title {
  margin: 0 0 4px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.005em;
}

.pub-authors,
.pub-venue,
.pub-note {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
}

.pub-authors .me {
  color: var(--text);
  font-weight: 600;
}

.pub-venue { margin-top: 3px; }

.venue {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 7px;
  border-radius: 5px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.6;
  vertical-align: 1px;
  white-space: nowrap;
}

.pub-note { font-style: italic; }

.pub-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
}

.btn,
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 9px;
  border-radius: 6px;
  font-size: 12.5px;
  font-weight: 500;
  line-height: 1.6;
  white-space: nowrap;
}

.btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
}
.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.btn svg.icon { width: 13px; height: 13px; }

.badge {
  border: 1px solid transparent;
  background: var(--tint);
  color: var(--muted);
}

.badge.award {
  background: var(--gold-soft);
  color: var(--gold);
  font-weight: 600;
}
.badge.award svg.icon { width: 13px; height: 13px; }

/* ---------- Rows: awards, teaching ---------- */

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

.rows li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  column-gap: 24px;
  padding: 11px 0;
  border-bottom: 1px solid var(--border);
}
.rows li:last-child { border-bottom: 0; }

.row-title { font-weight: 500; }

.row-sub {
  grid-column: 1;
  color: var(--muted);
  font-size: 14.5px;
}

.row-date {
  grid-column: 2;
  grid-row: 1;
  color: var(--muted);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  text-align: right;
  white-space: nowrap;
}

.rows li.highlight .row-title { color: var(--gold); }
.rows li.highlight .row-title svg.icon {
  width: 15px;
  height: 15px;
  margin-right: 6px;
  vertical-align: -2px;
}

/* ---------- Service ---------- */

.service {
  display: grid;
  grid-template-columns: 256px minmax(0, 1fr);
  margin: 0;
}

.service dt,
.service dd {
  margin: 0;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.service dt:last-of-type,
.service dd:last-of-type { border-bottom: 0; }

.service dt { font-weight: 500; }

.service dd {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.chip {
  padding: 1px 8px;
  border-radius: 5px;
  background: var(--tint);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.7;
}

@media (max-width: 599px) {
  .service { grid-template-columns: 1fr; }
  .service dt {
    padding-bottom: 6px;
    border-bottom: 0;
  }
  .service dd { padding-top: 0; }
}

/* ---------- Footer ---------- */

.footer {
  max-width: 1120px;
  margin: 72px auto 0;
  padding: 24px 16px 40px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13.5px;
  text-align: center;
}

@media (min-width: 900px) {
  .footer { padding: 28px 40px 48px; }
}

/* ---------- Print ---------- */

@media print {
  .toc, .skip { display: none; }
  .side { position: static; max-height: none; }
  body { background: #fff; }
  a { color: inherit; text-decoration: none; }
}