/* ============================================================
   NuLab — Multimessenger Astrophysics Research Group
   Static site · no JavaScript · no animations
   Palette: deep-space indigo + four messenger colors
     radio  #E8734A   x/γ-ray #C65BD6   neutrino #57C7E3   GW #9B8CF2
   ============================================================ */

:root {
  --bg:        #0A0E1A;
  --bg-raised: #10182B;
  --hairline:  #232C47;
  --ink:       #E8EAF2;
  --muted:     #97A0B8;
  --radio:     #E8734A;
  --xray:      #C65BD6;
  --nu:        #57C7E3;
  --gw:        #9B8CF2;
  --maxw:      1060px;
  --display:   "Spectral", Georgia, "Times New Roman", serif;
  --body:      "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono:      "IBM Plex Mono", ui-monospace, "SF Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: auto; }

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

a { color: var(--nu); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--nu);
  outline-offset: 3px;
  border-radius: 2px;
}

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

/* ---------- header / nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--hairline);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }

.brand svg { display: block; }

.brand .name {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.35rem;
  letter-spacing: 0.01em;
}

.brand .tag {
  display: block;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

nav.main-nav { display: flex; flex-wrap: wrap; gap: 4px; }

nav.main-nav a {
  color: var(--muted);
  font-size: 0.95rem;
  padding: 6px 12px;
  border-radius: 6px;
}
nav.main-nav a:hover { color: var(--ink); text-decoration: none; }
nav.main-nav a[aria-current="page"] {
  color: var(--ink);
  background: var(--bg-raised);
}

/* ---------- page header block ---------- */

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 14px;
}

h1 {
  font-family: var(--display);
  font-weight: 300;
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
}

h1 em { font-style: italic; }

h2 {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.6rem;
  line-height: 1.25;
  margin: 0 0 16px;
}

h3 {
  font-family: var(--body);
  font-weight: 600;
  font-size: 1.08rem;
  margin: 0 0 8px;
}

.lede {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 46em;
  margin: 0;
}

section, .page-head { padding-top: 56px; padding-bottom: 8px; }
.page-head { padding-top: 64px; }

/* ---------- hero ---------- */

.hero { padding: 72px 0 24px; }

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 40px;
  align-items: center;
}
.hero-logo img {
  display: block;
  width: 70%;
  max-width: 330px;
  height: auto;
  margin: 0 auto;
}

.news-image {
  display: block;
  width: 25%;
  min-width: 120px;
  height: auto;
  margin-top: 1rem;
  border-radius: 10px;
}

.subtitle {
  font-family: var(--display);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  line-height: 1.35;
  color: var(--ink);
  margin: -6px 0 18px;
  max-width: 30em;
}

.figure {
  margin: 52px 0 0;
  padding: 0;
}
.figure img {
  display: block;
  width: 100%;
  max-width: 560px;
  height: auto;
  margin: 0 auto;
}
.figure figcaption {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-align: center;
  margin-top: 14px;
}
.figure img { max-width: 620px; }

/* ---------- cards ---------- */

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 28px;
}

.card {
  background: var(--bg-raised);
  border: 1px solid var(--hairline);
  border-left-width: 3px;
  border-radius: 10px;
  padding: 22px 24px;
}
.card p { margin: 0; color: var(--muted); font-size: 0.98rem; }
.card.radio { border-left-color: var(--radio); }
.card.xray  { border-left-color: var(--xray); }
.card.nu    { border-left-color: var(--nu); }
.card.gw    { border-left-color: var(--gw); }

.card .kicker {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 10px;
}
.card.radio .kicker { color: var(--radio); }
.card.xray  .kicker { color: var(--xray); }
.card.nu    .kicker { color: var(--nu); }
.card.gw    .kicker { color: var(--gw); }

/* ---------- prose / long sections ---------- */

.prose { max-width: 46em; }
.wrap.prose { max-width: var(--maxw); }
.wrap.prose > * { max-width: 46em; }
.prose p { color: var(--ink); }
.prose p.dim { color: var(--muted); }

.rule {
  border: 0;
  border-top: 1px solid var(--hairline);
  margin: 56px 0 0;
}

/* ---------- news list ---------- */

.news { list-style: none; margin: 24px 0 0; padding: 0; }
.news li {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 18px;
  padding: 16px 0;
  border-top: 1px solid var(--hairline);
}
.news time {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  padding-top: 3px;
}

/* ---------- team ---------- */

.person {
  background: var(--bg-raised);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  padding: 24px;
}
.person .role {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--nu);
  margin: 0 0 8px;
}
.person.open .role { color: var(--gw); }
.person p { color: var(--muted); font-size: 0.98rem; margin: 8px 0 0; }

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

.pubs { list-style: none; margin: 28px 0 0; padding: 0; max-width: 52em; }
.pubs li { padding: 18px 0; border-top: 1px solid var(--hairline); }
.pubs .authors { color: var(--muted); font-size: 0.95rem; }
.pubs .meta {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 6px;
}
.pubs .meta a { color: var(--nu); }

/* ---------- join / callout ---------- */

.callout {
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--gw);
  background: var(--bg-raised);
  border-radius: 10px;
  padding: 24px 26px;
  margin-top: 28px;
  max-width: 52em;
}
.callout .deadline {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--gw);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.callout ul { color: var(--muted); margin: 12px 0 0; padding-left: 20px; }
.callout li { margin: 4px 0; }

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

.site-footer {
  margin-top: 96px;
  border-top: 1px solid var(--hairline);
  padding: 32px 0 48px;
  color: var(--muted);
  font-size: 0.88rem;
}
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 32px;
}
.site-footer p { margin: 0; max-width: 40em; }

/* ---------- responsive ---------- */

@media (max-width: 720px) {
  .grid { grid-template-columns: 1fr; }
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-logo img { max-width: 230px; }
  .news li { grid-template-columns: 1fr; gap: 4px; }
  .hero { padding-top: 48px; }
}