/* STAR Lab palette: royal navy #0A2463, sky blue #82C3F0, ink #1A2233.
   --accent-strong is a darker sky for text on light backgrounds. */
:root {
  --primary: #0A2463;
  --accent: #82C3F0;
  --accent-strong: #2D73B8;
  --ink: #1A2233;
  --muted: #5B6478;
  --bg: #FFFFFF;
  --bg-alt: #F4F7FB;
  --line: #E1E6EF;
  --card: #FFFFFF;
  --link: #0A2463;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #A9CFF5;
    --accent: #82C3F0;
    --accent-strong: #82C3F0;
    --ink: #E7EBF3;
    --muted: #A3ACBF;
    --bg: #0B1328;
    --bg-alt: #151C30;
    --line: #26304A;
    --card: #182038;
    --link: #9CCFF5;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
}

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

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 24px; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); font-size: 18px; }
.brand:hover { text-decoration: none; }
.brand img { display: block; }
nav { display: flex; gap: 24px; }
nav a { color: var(--muted); font-weight: 500; font-size: 15px; }
nav a:hover { color: var(--ink); text-decoration: none; }

/* ---------- hero ---------- */
.hero { padding: 88px 0 72px; }
.hero-grid { display: grid; grid-template-columns: 1fr 260px; gap: 48px; align-items: center; }
.eyebrow { color: var(--accent-strong); font-weight: 600; letter-spacing: .04em; text-transform: uppercase; font-size: 14px; margin: 0 0 12px; }
h1 { font-size: clamp(34px, 5vw, 52px); line-height: 1.12; letter-spacing: -.02em; margin: 0 0 20px; color: var(--primary); }
.lead { font-size: 19px; color: var(--muted); max-width: 40em; margin: 0 0 28px; }
.hero-mark img { width: 100%; height: auto; display: block; }

.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 10px 20px; border-radius: 8px;
  border: 1px solid var(--line); color: var(--ink); font-weight: 600; font-size: 15px;
}
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: #071A4A; }
@media (prefers-color-scheme: dark) {
  .btn.primary { background: var(--accent); border-color: var(--accent); color: #0A2463; }
  .btn.primary:hover { background: #A3D4F5; }
}

/* ---------- sections ---------- */
.section { padding: 72px 0; }
.section.alt { background: var(--bg-alt); }
h2 { font-size: 30px; letter-spacing: -.01em; margin: 0 0 32px; color: var(--primary); }
h2::after { content: ""; display: block; width: 40px; height: 3px; background: var(--accent); margin-top: 10px; border-radius: 2px; }
h3 { margin: 0 0 8px; font-size: 18px; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(220px, 100%), 1fr)); gap: 20px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 24px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.link-card { display: block; color: var(--ink); transition: border-color .15s; }
.link-card:hover { text-decoration: none; border-color: var(--accent); }
.link-card .more { display: inline-block; margin-top: 14px; color: var(--link); font-weight: 600; font-size: 14px; }

/* ---------- people ---------- */
.group { color: var(--muted); font-size: 14px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; margin: 28px 0 16px; }
.group:first-of-type { margin-top: 0; }
.people { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(260px, 100%), 1fr)); gap: 16px; }
.person { display: flex; align-items: center; gap: 16px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
.avatar {
  flex: none; width: 64px; height: 64px; border-radius: 50%; object-fit: cover;
  display: grid; place-items: center; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, #0A2463, #4F8FD0);
}
.name { font-weight: 600; color: var(--ink); }
.role { margin: 2px 0 0; color: var(--muted); font-size: 14px; }

/* ---------- publications ---------- */
.pubs { list-style: none; margin: 0; padding: 0; }
.pubs li { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 20px 0; border-top: 1px solid var(--line); }
.pubs li:last-child { border-bottom: 1px solid var(--line); }
.venue { align-self: start; justify-self: start; background: var(--bg-alt); color: var(--primary); border: 1px solid var(--line); border-radius: 6px; padding: 2px 10px; font-size: 13px; font-weight: 600; white-space: nowrap; }
.pubs .title { margin: 0; font-weight: 600; }
.pubs .authors { margin: 2px 0 6px; color: var(--muted); font-size: 15px; }
.pubs .links { margin: 0; display: flex; gap: 16px; font-size: 14px; font-weight: 600; }

/* ---------- news ---------- */
.news { list-style: none; margin: 0; padding: 0; }
.news li { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 12px 0; border-top: 1px solid var(--line); }
.news time { color: var(--accent-strong); font-weight: 600; font-size: 15px; }

/* ---------- join ---------- */
.join { background: var(--primary); color: #fff; }
.join h2 { color: #fff; }
.join p { max-width: 44em; color: #D6DCEC; margin: 0 0 24px; }
.join .btn.primary { background: var(--accent); border-color: var(--accent); color: #0A2463; }
@media (prefers-color-scheme: dark) {
  .join { background: #0F2050; }
}

/* ---------- footer ---------- */
.site-footer { padding: 40px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 15px; }
.footer-grid { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.site-footer strong { color: var(--ink); }
.footer-links { display: flex; gap: 20px; }

/* ---------- mobile ---------- */
@media (max-width: 760px) {
  .wrap { padding: 0 16px; }
  nav { gap: 14px; }
  nav a { font-size: 14px; }
  nav a[href="#news"], nav a[href="#join"] { display: none; }
  .hero { padding: 48px 0; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-mark { display: none; }
  .section { padding: 52px 0; }
  .pubs li, .news li { grid-template-columns: 1fr; gap: 6px; }
}