/* PEARL Lab — single stylesheet. Edit colors in :root and everything follows. */

:root {
  --maroon: #861f41;
  --maroon-dark: #5f1530;
  --orange: #e5751f;
  --ink: #1c1c1e;
  --body: #2f3338;
  --muted: #6b7280;
  --line: #e3e5e8;
  --bg: #ffffff;
  --bg-alt: #f7f7f5;
  --max: 1080px;
  --radius: 10px;
  --logo-ink: #861f41;
  --logo-accent: #e5751f;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2f2f2;
    --body: #d6d8dc;
    --muted: #9aa1ab;
    --line: #2e3236;
    --bg: #131517;
    --bg-alt: #1a1d20;
    --logo-ink: #d4708f;
    --logo-accent: #f0913f;
    --maroon: #d4708f;
    --maroon-dark: #e8a3b8;
    --orange: #f0913f;
  }
}

* { box-sizing: border-box; }

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

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

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

a { color: var(--maroon); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { color: var(--ink); line-height: 1.25; font-weight: 650; margin: 0 0 .5em; }
h1 { font-size: 2.1rem; letter-spacing: -0.02em; }
h2 { font-size: 1.45rem; letter-spacing: -0.01em; }
h3 { font-size: 1.08rem; }
p { margin: 0 0 1em; }

/* ---------- header ---------- */
header.site {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 50;
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand:hover { text-decoration: none; }
.brand .logo { display: block; line-height: 0; flex: 0 0 auto; }
.brand .logo svg { width: 34px; height: 34px; display: block; }
.brand .mark, .brand .sub { align-self: baseline; }
.brand .mark {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--maroon);
}
.brand .sub { font-size: .78rem; color: var(--muted); letter-spacing: .02em; }
@media (max-width: 980px) { .brand .sub { display: none; } }

/* acronym expansion strip */
.acronym { display: flex; flex-wrap: wrap; gap: 8px 26px; margin-top: 26px; }
.acronym div { font-size: .84rem; color: var(--muted); }
.acronym b { color: var(--maroon); font-family: var(--serif); font-size: 1.02rem;
  font-weight: 700; margin-right: 5px; }
nav.site a {
  color: var(--body);
  font-size: .93rem;
  margin-left: 22px;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
nav.site a:hover { text-decoration: none; border-bottom-color: var(--line); }
nav.site a[aria-current="page"] { color: var(--maroon); border-bottom-color: var(--maroon); }
nav.site a:first-child { margin-left: 0; }

@media (max-width: 640px) {
  header.site .wrap { min-height: 0; padding-top: 14px; padding-bottom: 10px; }
  nav.site { width: 100%; display: flex; flex-wrap: wrap; gap: 0 18px; }
  nav.site a { margin-left: 0; }
}

/* ---------- hero ---------- */
.hero { padding: 64px 0 52px; border-bottom: 1px solid var(--line); }
.hero h1 { font-size: 2.4rem; max-width: 27ch; text-wrap: balance; }
.hero .lede { font-size: 1.18rem; max-width: 62ch; color: var(--body); }
.hero .meta { color: var(--muted); font-size: .95rem; margin-top: 20px; }
@media (max-width: 640px) { .hero { padding: 40px 0 32px; } .hero h1 { font-size: 1.9rem; } }

/* ---------- sections ---------- */
section { padding: 52px 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: 0; }
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px; margin-bottom: 26px; flex-wrap: wrap;
}
.section-head h2 { margin: 0; }
.section-head a { font-size: .92rem; }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: .12em;
  font-size: .72rem;
  font-weight: 700;
  color: var(--orange);
  margin-bottom: 8px;
}

/* ---------- cards ---------- */
.grid { display: grid; gap: 20px; }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid.three { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  background: var(--bg);
}
.card h3 { margin-bottom: .4em; }
.card p { margin-bottom: 0; font-size: .95rem; color: var(--body); }
.card ul { margin: 12px 0 0; padding-left: 18px; font-size: .9rem; color: var(--muted); }
.card ul li { margin-bottom: 5px; }

/* the "why this matters" line */
.stake {
  font-size: .95rem !important;
  color: var(--ink) !important;
  font-weight: 550;
  margin-bottom: .7em !important;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
}
.stake.big { font-size: 1.12rem !important; max-width: 62ch; padding-left: 16px; }

.closing {
  margin-top: 34px;
  max-width: 68ch;
  font-size: 1.02rem;
  color: var(--body);
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

/* ---------- news ---------- */
.news-list { list-style: none; margin: 0; padding: 0; }
.news-list > li {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 20px;
}
.news-list > li:first-child { padding-top: 0; }
.news-date { color: var(--muted); font-size: .87rem; font-variant-numeric: tabular-nums; padding-top: 3px; }
.news-body h3 { margin-bottom: .3em; font-size: 1.05rem; }
.news-body p { margin: 0; font-size: .95rem; }
.news-body .extra { margin-top: .7em; font-size: .93rem; color: var(--muted); }
.news-body .extra a { color: var(--maroon); }
@media (max-width: 640px) {
  .news-list > li { grid-template-columns: 1fr; gap: 6px; }
}

.tag {
  display: inline-block;
  font-size: .68rem;
  text-transform: uppercase;
  letter-spacing: .09em;
  font-weight: 700;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 9px;
  margin-left: 8px;
  vertical-align: 2px;
}

.linkrow { margin-top: .6em; font-size: .9rem; display: flex; flex-wrap: wrap; gap: 14px; }

/* ---------- people ---------- */
.people { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(268px, 1fr)); }
.person {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.avatar {
  flex: 0 0 42px;
  width: 42px; height: 42px;
  border-radius: 50%;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  color: var(--maroon);
  display: grid; place-items: center;
  font-weight: 700; font-size: .82rem;
  letter-spacing: .02em;
}
.person .name { font-weight: 650; color: var(--ink); font-size: .98rem; }
.person .role { font-size: .85rem; color: var(--muted); }
.person .topic { font-size: .85rem; margin-top: 5px; }
.person .note { font-size: .8rem; color: var(--muted); margin-top: 3px; font-style: italic; }

.alumni-list { columns: 2; column-gap: 36px; font-size: .93rem; list-style: none; padding: 0; margin: 0; }
.alumni-list li { break-inside: avoid; padding: 5px 0; border-bottom: 1px solid var(--line); }
.alumni-list .yr { color: var(--muted); font-variant-numeric: tabular-nums; }
.alumni-list .th { display: block; font-size: .84rem; color: var(--muted); }
@media (max-width: 700px) { .alumni-list { columns: 1; } }

/* ---------- publications ---------- */
.pub-year { margin: 32px 0 14px; font-size: 1.15rem; color: var(--maroon); }
.pub { padding: 14px 0; border-bottom: 1px solid var(--line); }
.pub .t { font-weight: 600; color: var(--ink); }
.pub .a { font-size: .9rem; color: var(--body); }
.pub .v { font-size: .88rem; color: var(--muted); font-style: italic; }

.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.filters button {
  font: inherit; font-size: .85rem;
  padding: 5px 13px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--body);
  border-radius: 999px;
  cursor: pointer;
}
.filters button[aria-pressed="true"] { background: var(--maroon); border-color: var(--maroon); color: #fff; }

/* ---------- callout ---------- */
.callout {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
  padding: 18px 22px;
  font-size: .95rem;
}
.callout p:last-child { margin-bottom: 0; }

/* ---------- footer ---------- */
footer.site {
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
  padding: 36px 0;
  font-size: .9rem;
  color: var(--muted);
  margin-top: 20px;
}
footer.site .cols { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
footer.site a { color: var(--body); }
footer.site .links { display: flex; gap: 18px; flex-wrap: wrap; }

.skip {
  position: absolute; left: -9999px;
}
.skip:focus {
  left: 12px; top: 12px; background: var(--bg); padding: 10px 16px;
  border: 2px solid var(--maroon); border-radius: 6px; z-index: 100;
}

/* ---------- article (news permalink pages) ---------- */
.article { padding: 52px 0; max-width: 68ch; }
.article .kicker { color: var(--muted); font-size: .9rem; margin-bottom: 10px; }
.article h1 { font-size: 2rem; }
.article img { max-width: 100%; border-radius: var(--radius); }

/* ---------- sponsors / acknowledgement ---------- */
.sponsors { background: var(--bg-alt); padding: 44px 0; }
.sponsor-head {
  font-size: .74rem;
  text-transform: uppercase;
  letter-spacing: .13em;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 24px;
}
.sponsor-row {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}
.sponsor {
  display: flex; flex-direction: column; align-items: flex-start; gap: 4px;
  border-left: 2px solid var(--line);
  padding: 2px 0 2px 16px;
}
/* Official marks go on a white plate: they are drawn for light backgrounds and
   brand rules forbid recolouring them for dark mode. */
.sponsor img {
  max-height: 42px; max-width: 190px; width: auto; height: auto;
  display: block; margin-bottom: 8px;
  background: #fff; border-radius: 4px; padding: 5px 8px;
}
.sponsor.nologo { border-left-color: var(--orange); }
.sponsor-name {
  font-weight: 650; font-size: .97rem; color: var(--ink);
  text-decoration: none; line-height: 1.3;
}
.sponsor-name:hover { color: var(--maroon); text-decoration: underline; }
.sponsor-detail { font-size: .82rem; color: var(--muted); line-height: 1.45; }
.sponsor-note {
  margin: 26px 0 0; font-size: .8rem; color: var(--muted); max-width: 76ch;
}
@media (max-width: 640px) {
  .sponsor-row { grid-template-columns: 1fr; gap: 14px; }
}