/* =========================================================
   Angela Yuson Lee — academic site
   Clean top-nav layout inspired by jiachenyan.com
   ========================================================= */

:root {
  --bg: #ffffff;
  --bg-soft: #f7f6f3;
  --bg-card: #ffffff;
  --text: #1c1c1e;
  --text-soft: #54565b;
  --text-mute: #8a8d93;
  --border: #e7e5e0;
  --accent: #7a1f2b;        /* muted academic maroon */
  --accent-soft: #f3e9ea;
  --accent-ink: #5c151f;
  --link: #7a1f2b;
  --radius: 14px;
  --maxw: 1080px;
  --shadow: 0 1px 2px rgba(20,20,30,.04), 0 8px 24px rgba(20,20,30,.05);
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }

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

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Navigation ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
}
.nav__brand {
  font-family: var(--serif);
  font-weight: 600; font-size: 1.18rem; letter-spacing: .2px;
  color: var(--text);
}
.nav__brand:hover { text-decoration: none; color: var(--accent); }
.nav__links { display: flex; gap: 26px; align-items: center; list-style: none; margin: 0; padding: 0; }
.nav__links a {
  color: var(--text-soft); font-size: .96rem; font-weight: 500;
  padding: 4px 0; position: relative;
}
.nav__links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--accent); transform: scaleX(0);
  transform-origin: left; transition: transform .22s ease;
}
.nav__links a:hover { color: var(--accent); text-decoration: none; }
.nav__links a:hover::after,
.nav__links a.is-active::after { transform: scaleX(1); }
.nav__links a.is-active { color: var(--accent); }

.nav__toggle {
  display: none; background: none; border: 0; cursor: pointer;
  width: 40px; height: 40px; padding: 8px; color: var(--text);
}
.nav__toggle span { display: block; height: 2px; background: currentColor; margin: 5px 0; border-radius: 2px; transition: .25s; }

/* ---------- Hero ---------- */
.hero { padding: 64px 0 40px; }
.hero__grid {
  display: grid; grid-template-columns: 230px 1fr; gap: 48px; align-items: start;
}
.hero__aside { position: sticky; top: 96px; }
.hero__photo {
  width: 230px; height: 230px; object-fit: cover; border-radius: var(--radius);
  box-shadow: var(--shadow); margin-bottom: 20px; background: var(--bg-soft);
}
.hero__name {
  font-family: var(--serif); font-size: 2.5rem; line-height: 1.08;
  margin: 0 0 6px; letter-spacing: -.5px; font-weight: 600;
}
.hero__tagline { color: var(--accent); font-weight: 600; font-size: 1rem; margin: 0 0 18px; }
.hero__affil { color: var(--text-soft); font-size: .98rem; margin: 0 0 18px; }
.hero__affil div { margin-bottom: 2px; }
.hero__bio p { margin: 0 0 16px; color: var(--text); }
.hero__bio { max-width: 64ch; }

/* contact / social block in sidebar */
.contact-list { list-style: none; margin: 0 0 18px; padding: 0; font-size: .92rem; }
.contact-list li { margin-bottom: 7px; color: var(--text-soft); display: flex; gap: 8px; }
.contact-list .ic { color: var(--text-mute); flex: 0 0 18px; }
.social { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 4px; }
.social a {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border: 1px solid var(--border); border-radius: 10px;
  color: var(--text-soft); background: var(--bg-card); transition: .18s;
}
.social a:hover { color: #fff; background: var(--accent); border-color: var(--accent); text-decoration: none; transform: translateY(-1px); }
.social svg { width: 18px; height: 18px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: #fff; padding: 9px 16px; border-radius: 10px;
  font-weight: 600; font-size: .9rem; margin-top: 4px;
}
.btn:hover { background: var(--accent-ink); text-decoration: none; color: #fff; }
.btn svg { width: 16px; height: 16px; }

/* interests pills */
.interests { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 0; padding: 0; list-style: none; }
.interests li {
  font-size: .85rem; color: var(--accent-ink); background: var(--accent-soft);
  padding: 5px 11px; border-radius: 999px; font-weight: 500;
}

/* ---------- Sections ---------- */
.section { padding: 30px 0; }
.section--alt { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section__head {
  display: flex; align-items: baseline; gap: 12px; margin: 0 0 22px;
}
.section__title {
  font-family: var(--serif); font-size: 1.6rem; font-weight: 600; margin: 0; letter-spacing: -.3px;
}
.section__rule { flex: 1; height: 1px; background: var(--border); }
.page-head { padding: 50px 0 8px; }
.page-head h1 { font-family: var(--serif); font-size: 2.2rem; margin: 0 0 6px; font-weight: 600; }
.page-head p { color: var(--text-soft); margin: 0; }

/* ---------- Publications ---------- */
.pub-group + .pub-group { margin-top: 38px; }
.pub-group__title {
  font-size: 1.15rem; font-weight: 700; color: var(--text);
  display: flex; align-items: center; gap: 10px; margin: 0 0 4px;
}
.pub-group__title .count {
  font-size: .8rem; font-weight: 600; color: var(--text-mute);
  background: var(--bg-soft); border: 1px solid var(--border);
  padding: 1px 8px; border-radius: 999px;
}
.pub-group__sub { color: var(--text-mute); font-size: .9rem; margin: 0 0 18px; }

.pub {
  display: grid; grid-template-columns: 64px 1fr; gap: 18px;
  padding: 20px 0; border-top: 1px solid var(--border);
}
.pub:first-of-type { border-top: 0; }
.pub__year {
  font-family: var(--serif); font-size: 1.05rem; font-weight: 600;
  color: var(--accent); padding-top: 2px;
}
.pub__title { font-size: 1.06rem; font-weight: 600; margin: 0 0 4px; line-height: 1.4; }
.pub__authors { color: var(--text-soft); font-size: .95rem; margin: 0 0 3px; }
.pub__authors .me { color: var(--text); font-weight: 700; }
.pub__venue { font-size: .95rem; color: var(--text-soft); margin: 0 0 6px; font-style: italic; }
.pub__venue .venue-name { font-style: normal; font-weight: 600; color: var(--text); }
.pub__note { font-size: .85rem; color: var(--text-mute); margin: 0 0 6px; }
.pub__award {
  display: inline-flex; align-items: center; gap: 6px; font-size: .82rem; font-weight: 600;
  color: var(--accent-ink); background: var(--accent-soft); padding: 3px 10px; border-radius: 999px; margin: 0 0 8px;
}
.pub__links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.pub__links a, .pub__links button {
  font: inherit; cursor: pointer; font-size: .82rem; font-weight: 600;
  color: var(--text-soft); background: var(--bg-card); border: 1px solid var(--border);
  padding: 4px 11px; border-radius: 8px; transition: .16s;
}
.pub__links a:hover, .pub__links button:hover {
  color: var(--accent); border-color: var(--accent); text-decoration: none;
}
.pub__abstract {
  margin: 12px 0 2px; padding: 14px 16px; background: var(--bg-soft);
  border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0;
  font-size: .95rem; color: var(--text-soft); line-height: 1.6;
  display: none;
}
.pub__abstract.open { display: block; }

/* ---------- News ---------- */
.news-list { list-style: none; margin: 0; padding: 0; max-width: 760px; }
.news-list li {
  display: grid; grid-template-columns: 120px 1fr; gap: 18px;
  padding: 15px 0; border-top: 1px solid var(--border);
}
.news-list li:first-child { border-top: 0; }
.news-list .news__date { color: var(--accent); font-weight: 600; font-size: .92rem; }
.news-list .news__body { color: var(--text); }

/* ---------- Research page ---------- */
.prose { max-width: 72ch; }
.prose p { margin: 0 0 18px; }
.research-area {
  padding: 22px 0; border-top: 1px solid var(--border);
}
.research-area h3 { font-family: var(--serif); font-size: 1.25rem; margin: 0 0 8px; font-weight: 600; }
.research-area p { margin: 0; color: var(--text-soft); }

/* ---------- Partners ---------- */
.partner-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px;
}
.partner-card {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; background: var(--bg-card); box-shadow: var(--shadow);
  transition: transform .16s, box-shadow .16s;
}
.partner-card:hover { transform: translateY(-2px); box-shadow: 0 6px 22px rgba(20,20,30,.08); }
.partner-card__role {
  display: inline-block; font-size: .72rem; font-weight: 700; letter-spacing: .04em;
  text-transform: uppercase; color: var(--accent-ink); background: var(--accent-soft);
  padding: 3px 9px; border-radius: 999px; margin-bottom: 10px;
}
.partner-card__name { font-family: var(--serif); font-size: 1.15rem; margin: 0 0 6px; font-weight: 600; }
.partner-card__desc { margin: 0; color: var(--text-soft); font-size: .95rem; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border); margin-top: 40px;
  padding: 28px 0; color: var(--text-mute); font-size: .88rem;
}
.footer__inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; align-items: center; }
.footer a { color: var(--text-soft); }

/* ---------- Loading / empty ---------- */
.loading { color: var(--text-mute); font-size: .95rem; padding: 16px 0; }
.empty { color: var(--text-mute); font-style: italic; padding: 8px 0; }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  body { font-size: 16px; }
  .hero { padding: 36px 0 24px; }
  .hero__grid { grid-template-columns: 1fr; gap: 28px; }
  .hero__aside { position: static; display: flex; flex-direction: column; align-items: flex-start; }
  .hero__photo { width: 150px; height: 150px; }
  .hero__name { font-size: 2rem; }

  .nav__links {
    position: fixed; inset: 60px 0 auto 0; flex-direction: column; gap: 0;
    background: #fff; border-bottom: 1px solid var(--border);
    padding: 8px 24px 16px; transform: translateY(-120%); transition: transform .26s ease;
    box-shadow: var(--shadow);
  }
  .nav__links.open { transform: translateY(0); }
  .nav__links li { width: 100%; }
  .nav__links a { display: block; padding: 12px 0; border-bottom: 1px solid var(--border); }
  .nav__links a::after { display: none; }
  .nav__toggle { display: block; }

  .pub { grid-template-columns: 1fr; gap: 6px; }
  .pub__year { padding-top: 0; }
  .news-list li { grid-template-columns: 1fr; gap: 2px; }
}