/* ------------------------------------------------------------------
   Ming Yin — personal site
   Fonts are self-hosted (SIL Open Font License, see assets/fonts/*-OFL.txt).
   ------------------------------------------------------------------ */

@font-face { font-family: "Spectral"; src: url("fonts/Spectral-Regular.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Spectral"; src: url("fonts/Spectral-Italic.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "Spectral"; src: url("fonts/Spectral-Medium.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; }
@font-face { font-family: "Spectral"; src: url("fonts/Spectral-SemiBold.woff2") format("woff2"); font-weight: 600; font-style: normal; font-display: swap; }
@font-face { font-family: "Spectral"; src: url("fonts/Spectral-SemiBoldItalic.woff2") format("woff2"); font-weight: 600; font-style: italic; font-display: swap; }
@font-face { font-family: "Hanken Grotesk"; src: url("fonts/HankenGrotesk-Variable.woff2") format("woff2"); font-weight: 100 900; font-style: normal; font-display: swap; }

:root {
  --paper: #ffffff;
  --ink: #16202e;
  --muted: #566173;
  --rule: #e3e7ed;
  --accent: #00539b;          /* Duke royal blue */
  --accent-soft: #eaf1f9;
  --gold: #85500a;
  --gold-soft: #fbf0dc;
  --tile: #f1f4f8;
  --figure-bg: #ffffff;
  --link-line: rgba(0, 83, 155, 0.35);

  --serif: "Spectral", Georgia, "Times New Roman", serif;
  --sans: "Hanken Grotesk", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --measure: 46rem;
  --gutter: 1.25rem;

  color-scheme: light;
}

/* Dark palette: follows the system setting, and an explicit data-theme
   attribute (if a host page sets one) wins in either direction. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0f151d;
    --ink: #e4e9f0;
    --muted: #a1adbd;
    --rule: #243040;
    --accent: #8fbcf0;
    --accent-soft: #16263a;
    --gold: #efb45c;
    --gold-soft: #2c2317;
    --tile: #162030;
    --figure-bg: #f4f6f9;
    --link-line: rgba(143, 188, 240, 0.4);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0f151d;
  --ink: #e4e9f0;
  --muted: #a1adbd;
  --rule: #243040;
  --accent: #8fbcf0;
  --accent-soft: #16263a;
  --gold: #efb45c;
  --gold-soft: #2c2317;
  --tile: #162030;
  --figure-bg: #f4f6f9;
  --link-line: rgba(143, 188, 240, 0.4);
  color-scheme: dark;
}

/* ---------- base ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 4rem;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  text-decoration-color: var(--link-line);
}
a:hover { text-decoration-color: currentColor; }

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0.5rem;
  z-index: 20;
  padding: 0.4rem 0.75rem;
  background: var(--paper);
  font-family: var(--sans);
  font-size: 0.9rem;
}
.skip-link:focus { left: 1rem; }

/* ---------- navigation ---------- */

.site-nav {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 10;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.site-nav ul {
  display: flex;
  gap: 1.6rem;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--gutter);
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.site-nav ul::-webkit-scrollbar { display: none; }

.site-nav a {
  display: block;
  padding: 0.85rem 0 0.8rem;
  font-family: var(--sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}
.site-nav a:hover { color: var(--ink); }

/* ---------- layout ---------- */

main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--gutter) 3rem;
}

section { padding-top: 2.75rem; }

h2 {
  margin: 0 0 1.1rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--rule);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.005em;
}

/* ---------- intro ---------- */

.intro {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.25rem 2rem;
  align-items: start;
  padding-top: 3.25rem;
}

.intro h1 {
  margin: 0 0 0.7rem;
  font-size: clamp(2.35rem, 6.2vw, 3.3rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.018em;
}

.roles {
  margin: 0;
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--muted);
}

.contact {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
}

.contact .updated {
  font-size: 0.85em;
  font-weight: 400;
  color: var(--muted);
}

.portrait {
  width: clamp(6.25rem, 21vw, 10.5rem);
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 0.5rem;
}

.about { margin-top: 1.75rem; }

.about p {
  max-width: 41rem;
  margin: 0 0 1rem;
}

/* The research statement: the one sentence that maps the work */
.about .focus {
  margin: 1.4rem 0 1.2rem;
  font-size: 1.22rem;
  line-height: 1.55;
}
.about .focus a {
  color: var(--ink);
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.22em;
}
.about .focus a:hover { color: var(--accent); }

/* ---------- publications ---------- */

.legend {
  margin: -0.35rem 0 0;
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--muted);
}

.pub-group {
  margin: 2rem 0 0.4rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 650;
  color: var(--accent);
}

.pub {
  display: grid;
  grid-template-columns: 10.75rem 1fr;
  gap: 1.25rem;
  padding: 1rem 0;
}
.pub + .pub { border-top: 1px solid var(--rule); }

.thumb {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: 0.375rem;
  background: var(--figure-bg);
  text-decoration: none;
}
.thumb img {
  width: 100%;
  height: 100%;
  padding: 0.3rem;
  object-fit: contain;
}

/* Papers without a figure get a typeset cover instead */
.thumb--type {
  padding: 0.75rem;
  border-color: transparent;
  background: var(--accent-soft);
}
.thumb--type span {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-style: italic;
  font-weight: 600;
  line-height: 1.15;
  text-align: center;
  color: var(--accent);
}

.pub h4 {
  margin: 0 0 0.3rem;
  font-size: 1.06rem;
  font-weight: 600;
  line-height: 1.35;
}
.pub h4 a {
  color: var(--ink);
  text-decoration: none;
}
.pub h4 a:hover {
  text-decoration: underline;
  text-decoration-color: var(--accent);
}

.authors {
  margin: 0 0 0.5rem;
  font-family: var(--sans);
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--muted);
}
.authors .me {
  color: var(--ink);
  font-weight: 650;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.95rem;
  margin: 0;
  font-family: var(--sans);
  font-size: 0.85rem;
  line-height: 1.4;
}
.meta a { font-weight: 550; }

.venue {
  padding: 0.12rem 0.5rem;
  border-radius: 0.25rem;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 650;
}
.venue--star {
  background: var(--gold-soft);
  color: var(--gold);
}
.venue--pre {
  background: var(--tile);
  color: var(--muted);
}
.note { color: var(--muted); }

/* ---------- experience & education ---------- */

.entry {
  display: grid;
  grid-template-columns: 3.25rem minmax(0, 1fr);
  column-gap: 1.1rem;
  align-items: start;
  padding: 0.9rem 0;
}
.entry + .entry { border-top: 1px solid var(--rule); }

/* Organization marks sit on a light tile so they read in both themes */
.logo {
  width: 3.25rem;
  height: 3.25rem;
  margin-top: 0.2rem;
  padding: 0.45rem;
  object-fit: contain;
  background: var(--figure-bg);
  border: 1px solid var(--rule);
  border-radius: 0.6rem;
}
.logo--fill {
  padding: 0;
  border: 0;
}

.entry-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.1rem 1rem;
}
.entry h3 {
  margin: 0;
  font-size: 1.13rem;
  font-weight: 600;
  line-height: 1.35;
}
.when {
  font-family: var(--sans);
  font-size: 0.875rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.role {
  margin: 0.1rem 0 0.35rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
}
.entry .desc {
  margin: 0;
  font-size: 1rem;
}

/* ---------- awards & service ---------- */

.plain-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.plain-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.4rem 0;
}
.plain-list li + li { border-top: 1px solid var(--rule); }
.plain-list .detail { color: var(--muted); white-space: nowrap; }
.plain-list .when { flex: none; }

.service p { margin: 0 0 0.6rem; }
.service .label {
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 650;
}

/* ---------- footer ---------- */

.site-footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--gutter) 3rem;
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--muted);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}
.site-footer p { margin: 0; }

/* ---------- small screens ---------- */

@media (max-width: 600px) {
  :root { --gutter: 1rem; }
  .site-nav ul { gap: 1.15rem; }
  .site-nav a { font-size: 0.85rem; }
  .about { margin-top: 1.4rem; }
  .intro { padding-top: 2.25rem; gap: 1rem 1.25rem; }
  .about .focus { font-size: 1.12rem; }
  .pub { grid-template-columns: 1fr; gap: 0; }
  .thumb { display: none; }
  .entry { grid-template-columns: 2.75rem minmax(0, 1fr); column-gap: 0.85rem; }
  .logo { width: 2.75rem; height: 2.75rem; padding: 0.38rem; }
  .logo--fill { padding: 0; }
  .plain-list li { flex-direction: column; gap: 0; }
}

@media print {
  .site-nav, .skip-link { display: none; }
  .pub { break-inside: avoid; }
  a { color: inherit; }
}