:root {
  --teal: #0099cc;
  --teal-dark: #0077a3;
  --blue: #003d5c;
  --bg: #f4f7f9;
  --surface: #ffffff;
  --muted: #5b6770;
  --text: #1f2a32;
  --border: rgba(0, 61, 92, 0.12);
  --shadow: 0 18px 42px rgba(0, 61, 92, 0.12);
  --radius-lg: 26px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --container: min(1180px, calc(100vw - 2rem));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Source Sans 3", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 10%, rgba(0, 153, 204, 0.12), transparent 26%),
    radial-gradient(circle at 88% 12%, rgba(0, 61, 92, 0.12), transparent 24%),
    var(--bg);
}
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
.sr-only { position: absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }
.container { width: var(--container); margin: 0 auto; }

.utility-bar {
  background: var(--blue);
  color: rgba(255,255,255,0.85);
}
.utility-inner {
  display: flex; flex-direction: column; gap: .6rem;
  padding: .8rem 0;
}
.utility-nav { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }
.utility-nav a, .utility-nav button { color: inherit; background: transparent; border: 0; cursor: pointer; }

.main-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(0,61,92,0.08);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 1rem 0;
}
.brand { display: inline-flex; align-items: center; gap: .8rem; font-family: "Manrope", sans-serif; font-weight: 800; color: var(--blue); }
.brand-mark { width: 2.6rem; height: 2.6rem; border-radius: .9rem; display: grid; place-items: center; background: #fff; overflow: hidden; border: 1px solid rgba(0, 61, 92, 0.12); }
.brand-mark img { width: 100%; height: 100%; object-fit: cover; display: block; }

.menu-toggle { display: inline-flex; flex-direction: column; gap: .28rem; border:0; background:transparent; padding:.2rem; cursor:pointer; }
.menu-toggle span:not(.sr-only) { width: 1.6rem; height: 2px; border-radius: 999px; background: var(--blue); }

.navigation-shell { display: none; width: 100%; padding-top: 1rem; }
.navigation-shell.is-open { display: block; }
.main-nav { display: flex; flex-direction: column; gap: .4rem; }
.nav-item { position: relative; }
.nav-link {
  width: 100%; display: inline-flex; align-items: center; justify-content: space-between;
  padding: .9rem 1rem; border-radius: 999px; border:0; background: transparent;
  color: var(--blue); font-weight: 700; cursor: pointer;
}
.nav-link:hover, .nav-link:focus-visible { background: rgba(0,153,204,0.12); outline: none; }
.dropdown-toggle::after { content: "+"; }
.dropdown-menu { display: none; padding: .3rem 0 .7rem; }
.nav-item.is-open .dropdown-menu { display: grid; gap: .2rem; }
.dropdown-menu a { padding: .7rem 1rem; border-radius: 1rem; color: var(--muted); }
.dropdown-menu a:hover { background: rgba(0,153,204,0.08); color: var(--blue); }

.search-panel { border-top: 1px solid rgba(0,61,92,0.1); background: #fff; }
.search-panel-inner { padding: 1rem 0 1.2rem; }
.search-label { display: inline-block; margin-bottom: .6rem; font-weight: 700; color: var(--blue); }
.search-row { display: grid; gap: .65rem; }
.search-row input, .search-row select {
  width: 100%; padding: .9rem 1rem; border-radius: 1rem; border: 1px solid var(--border); background: #f0f5f7;
}
.btn-compact { padding: .65rem 1.1rem; min-height: unset; }
.search-close { border:0; background: var(--blue); color:#fff; padding:.75rem 1.05rem; border-radius: 999px; cursor:pointer; }
.search-results { display: grid; gap: .75rem; margin-top: 1rem; }
.search-result { padding: 1rem; border-radius: 1rem; background: #f0f5f7; border: 1px solid rgba(0,153,204,0.12); }
.muted { color: var(--muted); font-size: .95rem; }

.hero {
  position: relative; overflow: hidden; min-height: 520px;
  background:
    radial-gradient(circle at 30% 30%, rgba(0,153,204,0.16), transparent 32%),
    linear-gradient(135deg, rgba(0,61,92,0.9) 0%, rgba(0,153,204,0.72) 60%, rgba(0,153,204,0.36) 100%);
}
.hero-overlay { position:absolute; inset:0; mix-blend-mode: overlay; background: linear-gradient(180deg, rgba(0,0,0,0.15), rgba(0,0,0,0.05)); }
.hero-content { position: relative; z-index: 1; padding: 4rem 0 5rem; }
.hero-copy { max-width: 660px; color: #fff; }
.eyebrow { margin: 0 0 .55rem; letter-spacing: .14em; text-transform: uppercase; font-weight: 700; font-size: .8rem; color: #a9ecff; }
h1, h2, h3 { margin: 0; font-family: "Manrope", sans-serif; line-height: 1.08; }
h1 { font-size: clamp(2.4rem, 6vw, 4.4rem); }
h2 { font-size: clamp(1.9rem, 4vw, 2.8rem); color: var(--blue); }
h3 { font-size: 1.2rem; color: var(--blue); }
.hero-copy p { color: rgba(255,255,255,0.9); font-size: 1.05rem; }

.hero-actions, .footer-bottom { display: flex; flex-direction: column; gap: .85rem; margin-top: 1.4rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 3.2rem; padding: .9rem 1.3rem;
  border-radius: 999px; font-weight: 700; border: 0;
  transition: transform 160ms ease, box-shadow 160ms ease;
}
.btn-primary { background: linear-gradient(135deg, var(--teal) 0%, var(--teal-dark) 100%); color: #fff; box-shadow: 0 16px 36px rgba(0,119,163,0.28); }
.btn-secondary { background: rgba(255,255,255,0.16); border: 1px solid rgba(255,255,255,0.3); color: #fff; }
.btn:hover, .btn:focus-visible { transform: translateY(-2px); outline: none; }

.section-head { margin-bottom: 1.2rem; }
.mission-section, .feature-section, .resources-section, .why-section, .research-spotlight, .featured-paper, .paper-detail, .related, .locations-section, .support-cta { padding: 2.2rem 0 0; }
.cards-grid, .resource-grid, .highlights-grid, .footer-grid { display: grid; gap: 1rem; }
.action-card, .resource-card, .highlight-card, .location-card, .support-panel, .paper-card {
  position: relative; overflow: hidden; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow); padding: 1.35rem;
}

.mission-wrap {
  display: grid;
  gap: 1rem;
}

.mission-lead,
.mission-card,
.research-spotlight-inner {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.mission-lead {
  padding: 1.5rem;
  background:
    radial-gradient(circle at 12% 0%, rgba(0, 153, 204, 0.09), transparent 34%),
    #ffffff;
}

.mission-lead p:last-child,
.mission-card p,
.research-spotlight-inner p {
  color: var(--muted);
  line-height: 1.65;
}

.mission-grid {
  display: grid;
  gap: 1rem;
}

.mission-card {
  padding: 1.25rem;
}

.research-spotlight-inner {
  padding: 1.5rem;
  background:
    linear-gradient(145deg, rgba(0, 61, 92, 0.95) 0%, rgba(0, 119, 163, 0.9) 100%),
    #014868;
  border-color: rgba(255, 255, 255, 0.18);
}

.research-spotlight-inner .eyebrow,
.research-spotlight-inner h2,
.research-spotlight-inner p {
  color: #ffffff;
}

.research-spotlight-inner .btn {
  margin-top: 0.9rem;
}
.action-icon { width: 3.6rem; height: 3.6rem; border-radius: 1rem; display: grid; place-items: center; background: linear-gradient(135deg, rgba(0,153,204,0.14), rgba(0,61,92,0.14)); margin-bottom: 1rem; }
.action-icon svg { width: 1.8rem; fill: var(--blue); }
.card-skeleton { position:absolute; inset:0; background:linear-gradient(90deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.55) 50%, rgba(255,255,255,0) 100%); transform:translateX(-100%); animation: shimmer 1.3s infinite; }
.action-card:not(.is-loading) .card-skeleton { display:none; }
@keyframes shimmer { 100% { transform: translateX(100%); } }

.resource-grid { grid-template-columns: 1fr; }
.resource-card { min-height: 120px; background: linear-gradient(180deg, #f0f6f8, #fff); display: grid; place-items: start; padding: 1.1rem; font-weight: 700; }

.highlights-grid { grid-template-columns: 1fr; }
.highlight-badge { width: 3rem; height: 3rem; border-radius: 999px; display:grid; place-items:center; background: rgba(0,153,204,0.12); color: var(--blue); font-weight: 800; margin-bottom: .9rem; }

.featured-paper .paper-card { padding: 1.5rem; }
.paper-meta { display: flex; flex-wrap: wrap; gap: .8rem; align-items: center; color: var(--muted); }
.paper-tags { display: flex; flex-wrap: wrap; gap: .45rem; }
.paper-tags span { padding: .35rem .65rem; border-radius: 999px; background: rgba(0,153,204,0.12); color: var(--blue); font-weight: 700; font-size: .9rem; }
.paper-preview { color: var(--muted); line-height: 1.65; }
.paper-actions { display: flex; gap: .8rem; flex-wrap: wrap; }

.paper-detail .paper-header { display: flex; flex-direction: column; gap: .9rem; margin-bottom: 1rem; }
.paper-edition { color: var(--muted); }
.paper-tools { display: flex; gap: .6rem; flex-wrap: wrap; }
.status-text { font-size: .95rem; color: var(--blue); min-height: 1.2rem; }

.tabs { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: .5rem; margin-bottom: 1rem; }
.tab { padding: .85rem; border-radius: var(--radius-sm); border: 1px solid var(--border); background: #f0f6f8; color: var(--blue); cursor: pointer; }
.tab.active { background: var(--teal); color: #fff; border-color: var(--teal); }
.tab-panels { background: var(--surface); border-radius: var(--radius-lg); border: 1px solid var(--border); box-shadow: var(--shadow); padding: 1.2rem; }
.tab-panel { display: none; color: var(--text); line-height: 1.7; }
.tab-panel.active { display: block; }
.term { color: var(--teal-dark); font-weight: 700; position: relative; cursor: help; }
.term::after {
  content: attr(data-tooltip);
  position: absolute; left: 0; bottom: 120%;
  background: #003d5c; color: #fff; padding: .45rem .6rem; border-radius: .6rem;
  white-space: nowrap; opacity: 0; transform: translateY(6px);
  pointer-events: none; transition: opacity 140ms ease, transform 140ms ease;
  font-size: .9rem;
}
.term:focus-visible::after, .term:hover::after { opacity: 1; transform: translateY(0); }

.references { padding-left: 1.2rem; color: var(--muted); }
.figure-list { margin: 0; padding-left: 1.2rem; color: var(--muted); }

.related-grid { display: grid; gap: 1rem; grid-template-columns: 1fr; }
.related-card { padding: 1.1rem; border-radius: var(--radius-md); border: 1px solid var(--border); background: #fff; box-shadow: var(--shadow); }
.related-card h4 { margin: 0 0 .4rem; color: var(--blue); }
.related-card p { margin: 0 0 .4rem; color: var(--muted); }
.related-card .tag { display: inline-block; margin-right: .5rem; padding: .35rem .55rem; border-radius: 999px; background: rgba(0,153,204,0.12); color: var(--blue); font-weight: 700; font-size: .85rem; }

.locations-section .carousel-track {
  display: grid; grid-auto-flow: column; grid-auto-columns: 88%; gap: 1rem;
  overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-width: none;
}
.carousel-track::-webkit-scrollbar { display: none; }
.location-card { scroll-snap-align: start; min-height: 210px; }
.location-label { display: inline-flex; padding: .4rem .75rem; border-radius: 999px; background: #f0f6f8; color: var(--blue); font-weight: 700; margin-bottom: .75rem; }
.with-controls { display: flex; justify-content: space-between; align-items: end; gap: 1rem; }
.carousel-controls { display: flex; gap: .6rem; }
.carousel-btn { width: 3rem; height: 3rem; border-radius: 999px; border: 1px solid var(--border); background: #fff; color: var(--blue); font-size: 1.4rem; cursor: pointer; }

.support-panel {
  display: flex; flex-direction: column; gap: 1rem;
  background: linear-gradient(135deg, var(--blue) 0%, var(--teal-dark) 100%);
  color: #fff;
}
.support-panel p, .support-panel h2, .support-panel .eyebrow { color: #fff; }

.site-footer {
  margin-top: 2rem; padding: 2rem 0 1.2rem;
  background: var(--blue); color: #fff;
}
.footer-grid { grid-template-columns: 1fr; }
.footer-col h3 { margin: 0 0 .6rem; }
.footer-col a, .footer-col p { color: rgba(255,255,255,0.76); margin: 0 0 .5rem; display: block; }
.social-links { display: flex; gap: .55rem; }
.social-links a { width: 2.4rem; height: 2.4rem; border-radius: 999px; display: grid; place-items: center; background: rgba(255,255,255,0.12); }
.footer-bottom { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid rgba(255,255,255,0.14); }
.footer-legal { display: flex; gap: 1rem; flex-wrap: wrap; }

@media (min-width: 768px) {
  .utility-inner, .hero-actions, .footer-bottom { flex-direction: row; justify-content: space-between; align-items: center; }
  .search-row { grid-template-columns: repeat(4, minmax(0, 1fr)) auto auto; align-items: center; }
  .cards-grid, .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mission-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .resource-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .highlights-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .related-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .locations-section .carousel-track { grid-auto-columns: 48%; }
  .support-panel { flex-direction: row; align-items: center; justify-content: space-between; }
}

@media (min-width: 1025px) {
  .menu-toggle { display: none; }
  .navigation-shell { display: block; width: auto; padding-top: 0; }
  .main-nav { flex-direction: row; gap: .25rem; }
  .nav-link { width: auto; padding: .8rem .95rem; }
  .dropdown-menu {
    position: absolute; top: calc(100% + .45rem); left: 0; min-width: 220px;
    background: #fff; padding: .5rem; border: 1px solid rgba(0,61,92,0.08);
    border-radius: 1rem; box-shadow: var(--shadow);
  }
  .nav-item:hover .dropdown-menu, .nav-item:focus-within .dropdown-menu, .nav-item.is-open .dropdown-menu { display: grid; }
  .cards-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .mission-wrap { grid-template-columns: 1.2fr 1fr; align-items: stretch; }
  .mission-grid { grid-template-columns: 1fr; }
  .highlights-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .related-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr 1.2fr 1fr .9fr; }
  .locations-section .carousel-track { grid-auto-columns: calc(25% - .75rem); }
}