/* =========================================================================
   Personal academic homepage — stylesheet
   Palette: warm paper + ink + a single deep-teal accent
   Type:    Newsreader (display serif) / IBM Plex Sans (body) / IBM Plex Mono (meta)
   ========================================================================= */

:root {
  --paper:       #FAFAF7;   /* page background        */
  --panel:       #F2F1EA;   /* faint raised panel     */
  --ink:         #211F1B;   /* primary text           */
  --ink-2:       #5E5A52;   /* secondary text         */
  --ink-3:       #8C877D;   /* meta / muted           */
  --rule:        #E4E1D7;   /* hairlines              */
  --accent:      #1C5C53;   /* deep teal              */
  --accent-2:    #2C8076;   /* hover teal             */
  --accent-wash: #EAF1EF;   /* faint teal background  */

  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans:  "IBM Plex Sans", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --measure: 64ch;
  --maxw: 1180px;
}

/* ---------- reset-ish ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.62;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
  transition: color .15s ease;
}
a:hover { color: var(--accent-2); text-decoration: underline; }

::selection { background: var(--accent-wash); }

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

/* skip link */
.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--paper);
  padding: 10px 16px; z-index: 100; border-radius: 0 0 4px 0;
}
.skip:focus { left: 0; }

/* =========================================================================
   Layout: sticky left rail + reading column
   ========================================================================= */
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 72px;
  align-items: start;
}

/* ---- left rail ---- */
.rail {
  position: sticky;
  top: 0;
  align-self: start;
  padding: 56px 0 40px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.portrait {
  width: 116px; height: 116px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--rule);
  background: var(--panel);
}

.rail-name {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.62rem;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0;
}
.rail-name a { color: var(--ink); }
.rail-name a:hover { color: var(--accent); text-decoration: none; }

.rail-role {
  font-family: var(--mono);
  font-size: 0.74rem;
  line-height: 1.55;
  letter-spacing: 0.01em;
  color: var(--ink-2);
  margin: 10px 0 0;
}
.rail-role span { color: var(--ink-3); }

.rail-email {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.01em;
  color: var(--ink-2);
  margin: 0;
  word-break: break-word;
}

/* in-page nav */
.nav { margin-top: 4px; }
.nav ul { list-style: none; margin: 0; padding: 0; }
.nav li { margin: 0; }
.nav a {
  display: block;
  color: var(--ink-2);
  font-size: 0.92rem;
  padding: 5px 0 5px 16px;
  border-left: 2px solid var(--rule);
  transition: color .15s ease, border-color .15s ease;
}
.nav a:hover,
.nav a[aria-current="true"] {
  color: var(--accent);
  border-left-color: var(--accent);
  text-decoration: none;
}

.rail-foot {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* social row */
.social { display: flex; flex-wrap: wrap; gap: 14px; }
.social a {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--ink-2);
}
.social a:hover { color: var(--accent); text-decoration: none; }

.lang {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-3);
}
.lang a { color: var(--ink-2); }
.lang strong { color: var(--ink); font-weight: 600; }

.copyright {
  font-family: var(--mono);
  font-size: 0.66rem;
  color: var(--ink-3);
  line-height: 1.5;
}

/* =========================================================================
   Main column
   ========================================================================= */
.main { padding: 56px 0 96px; max-width: 760px; }

section { scroll-margin-top: 28px; }
section + section { margin-top: 64px; }

/* section header: mono eyebrow + hairline */
.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 26px;
}
.eyebrow::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
}

/* hero / intro */
.lede {
  font-family: var(--sans);
  font-size: 1.74rem;
  line-height: 1.34;
  font-weight: 400;
  letter-spacing: -0.012em;
  color: var(--ink);
  margin: 0 0 1.1em;
}
.lede em { font-style: italic; color: var(--accent); }
.lede { margin-bottom: 0.5em; }
.lede-note {
  font-size: 0.9rem;
  color: var(--ink-3);
  margin: 0 0 1.4em;
  letter-spacing: 0.01em;
}

.prose p { margin: 0 0 1.05em; max-width: var(--measure); }
.prose p:last-child { margin-bottom: 0; }
.prose strong { font-weight: 600; }

h2.h {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
}
h3.sub {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.18rem;
  margin: 1.6em 0 0.4em;
}

/* research interest chips */
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 4px; }
.tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.01em;
  color: var(--ink-2);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 4px 12px;
}

/* =========================================================================
   Publications — hanging-indent bibliography
   ========================================================================= */
.pub-list { list-style: none; margin: 0; padding: 0; }
.pub {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 18px;
  padding: 22px 0;
  border-top: 1px solid var(--rule);
}
.pub:first-child { border-top: none; padding-top: 4px; }
.pub > *, .edu > * { min-width: 0; }   /* allow grid columns to shrink/wrap instead of overflowing */

.pub-year {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-3);
  padding-top: 2px;
}
.pub-title {
  font-weight: 600;
  font-size: 1.02rem;
  line-height: 1.4;
  margin: 0 0 4px;
  color: var(--ink);
}
.pub-meta {
  font-size: 0.92rem;
  color: var(--ink-2);
  margin: 0 0 8px;
}
.pub-meta em { font-style: italic; }

/* small text links row */
.links { display: flex; flex-wrap: wrap; gap: 6px 8px; margin-top: 8px; }
.links a {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 3px 9px;
  transition: background .15s ease, border-color .15s ease;
}
.links a:hover { background: var(--accent-wash); border-color: var(--accent); text-decoration: none; }

/* abstract toggle */
details.abstract { margin-top: 10px; }
details.abstract > summary {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-2);
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  user-select: none;
}
details.abstract > summary::-webkit-details-marker { display: none; }
details.abstract > summary::before {
  content: "+";
  font-size: 0.9rem;
  color: var(--accent);
  line-height: 1;
}
details.abstract[open] > summary::before { content: "–"; }
details.abstract > summary:hover { color: var(--accent); }
.abstract-body {
  margin-top: 10px;
  padding-left: 16px;
  border-left: 2px solid var(--accent-wash);
  font-size: 0.95rem;
  color: var(--ink-2);
  line-height: 1.6;
  max-width: var(--measure);
}

/* education timeline */
.edu {
  display: grid;
  grid-template-columns: 138px 1fr;
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
}
.edu:first-child { border-top: none; padding-top: 4px; }
.edu-date {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-3);
  padding-top: 2px;
}
.edu-deg { font-weight: 600; font-size: 1.02rem; line-height: 1.42; margin: 0; color: var(--ink); }
.edu-note { font-size: 0.92rem; color: var(--ink-2); margin: 5px 0 0; line-height: 1.55; }
.edu-paper { font-size: 0.88rem; color: var(--ink-2); margin: 4px 0 0; line-height: 1.5; }
.edu-paper .edu-paper-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-right: 7px;
}

/* "archive / see all" link under a section */
.more { margin-top: 18px; }
.more a {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.more a:hover { color: var(--accent); }

/* standalone sub-pages (e.g. news archive) */
.subpage { max-width: 760px; margin: 0 auto; padding: 72px 22px 96px; }
.subpage .back {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0 0 12px;
}
.subpage .back a { color: var(--ink-2); }
.subpage .back a:hover { color: var(--accent); }
.subpage h1 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.9rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 40px;
}

/* teaching / generic entries */
.entry { padding: 18px 0; border-top: 1px solid var(--rule); }
.entry:first-of-type { border-top: none; }
.entry h3 { margin: 0 0 2px; font-size: 1.02rem; font-weight: 600; }
.entry .where { font-family: var(--mono); font-size: 0.74rem; color: var(--ink-3); }
.entry p { margin: 8px 0 0; color: var(--ink-2); font-size: 0.96rem; }

/* contact */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px 32px;
  margin-top: 4px;
}
.contact-grid .k {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 4px;
}
.contact-grid .v { font-size: 1rem; }

/* math blocks shouldn't overflow on mobile */
mjx-container { max-width: 100%; overflow-x: auto; overflow-y: hidden; }

/* =========================================================================
   Mobile top bar (hidden on desktop)
   ========================================================================= */
.topbar { display: none; }

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 880px) {
  .wrap {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0 22px;
  }
  .rail {
    position: static;
    min-height: 0;
    padding: 40px 0 8px;
    gap: 20px;
  }
  .rail-foot { margin-top: 8px; }
  .nav { display: none; }              /* in-page nav moves to top bar */

  .topbar {
    display: block;
    position: sticky;
    top: 0;
    z-index: 30;
    background: color-mix(in srgb, var(--paper) 92%, transparent);
    backdrop-filter: saturate(120%) blur(6px);
    border-bottom: 1px solid var(--rule);
    margin: 0 -22px 0;
  }
  .topbar nav {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    padding: 10px 22px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .topbar nav::-webkit-scrollbar { display: none; }
  .topbar a {
    flex: 0 0 auto;
    font-family: var(--mono);
    font-size: 0.74rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--ink-2);
    padding: 5px 10px;
    border-radius: 5px;
  }
  .topbar a:hover { color: var(--accent); background: var(--accent-wash); text-decoration: none; }

  .main { padding: 32px 0 72px; max-width: none; }
  section + section { margin-top: 52px; }
  .lede { font-size: 1.46rem; }
  body { font-size: 16px; }
}

@media (max-width: 460px) {
  /* keep the two-column table on narrow screens (date/label left, content right) */
  .pub { grid-template-columns: 46px 1fr; gap: 12px; }
  .pub-year { padding-top: 2px; }
  .edu { grid-template-columns: 84px 1fr; gap: 12px; }
  .edu-date { padding-top: 2px; font-size: 0.72rem; }
}

/* =========================================================================
   On-load reveal (respects reduced motion)
   ========================================================================= */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(10px); }
  .reveal.in { opacity: 1; transform: none; transition: opacity .6s ease, transform .6s ease; }
}

/* =========================================================================
   Print (save-as-PDF friendly CV view)
   ========================================================================= */
@media print {
  .rail, .topbar { position: static; }
  .nav, .social, .lang, .topbar, details.abstract { display: none; }
  .wrap { display: block; max-width: none; padding: 0; }
  body { font-size: 11pt; color: #000; background: #fff; }
  a { color: #000; text-decoration: none; }
  .links a { border: none; padding: 0; }
}