:root {
  --mason-green: #005239;
  --mason-green-deep: #003d2b;
  --mason-green-light: #e7f2ed;
  --mason-gold: #ffc733;
  --ink: #17211d;
  --muted: #5d6a64;
  --line: #dce4df;
  --surface: #ffffff;
  --surface-soft: #f5f8f6;
  --dark: #10251e;
  --max-width: 1180px;
  --shadow: 0 18px 55px rgba(16, 37, 30, 0.10);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

body.menu-open { overflow: hidden; }

a { color: inherit; }

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

button, input, textarea, select { font: inherit; }

.container {
  width: min(calc(100% - 40px), var(--max-width));
  margin-inline: auto;
}

.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;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  transform: translateY(-160%);
  padding: 10px 14px;
  background: var(--mason-gold);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
  border-radius: 6px;
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(220, 228, 223, 0.85);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: white;
  background: var(--mason-green);
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 700;
  font-size: 1.35rem;
  box-shadow: inset 0 -3px 0 var(--mason-gold);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text strong {
  font-size: 0.96rem;
  letter-spacing: -0.02em;
}

.brand-text small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.72rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-nav a {
  color: #314039;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible { color: var(--mason-green); }

.site-nav .nav-cta {
  padding: 9px 16px;
  color: white;
  border-radius: 8px;
  background: var(--mason-green);
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.menu-button span:not(.sr-only) {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.hero {
  position: relative;
  min-height: 680px;
  display: grid;
  align-items: center;
  overflow: hidden;
  color: white;
  background:
    radial-gradient(circle at 78% 25%, rgba(255, 199, 51, 0.22), transparent 18%),
    radial-gradient(circle at 80% 50%, rgba(100, 183, 144, 0.23), transparent 28%),
    linear-gradient(120deg, #003d2b 0%, #005239 50%, #0a6a4b 100%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  opacity: 0.16;
  background-image:
    linear-gradient(rgba(255,255,255,.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.16) 1px, transparent 1px);
  background-size: 64px 64px;
  transform: perspective(700px) rotateX(58deg) scale(1.7) translateY(18%);
  transform-origin: center bottom;
}

.hero::after {
  content: "";
  position: absolute;
  width: 520px;
  height: 520px;
  right: -110px;
  bottom: -220px;
  border: 1px solid rgba(255,255,255,.24);
  border-radius: 50%;
  box-shadow:
    0 0 0 70px rgba(255,255,255,.025),
    0 0 0 145px rgba(255,255,255,.018);
}

.hero-content {
  position: relative;
  z-index: 2;
  padding-block: 100px 84px;
}

.eyebrow,
.section-kicker {
  color: var(--mason-gold);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1,
.section h2 {
  font-family: "Source Serif 4", Georgia, serif;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

.hero h1 {
  max-width: 830px;
  margin: 18px 0 24px;
  font-size: clamp(3rem, 7vw, 5.8rem);
}

.hero-copy {
  max-width: 760px;
  margin: 0;
  color: rgba(255,255,255,.84);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 9px;
  font-weight: 700;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(0,0,0,.16);
}

.button-primary {
  color: #1d2a25;
  background: var(--mason-gold);
}

.button-secondary {
  color: white;
  border-color: rgba(255,255,255,.45);
  background: rgba(255,255,255,.08);
}

.hero-stats {
  max-width: 760px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 64px 0 0;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.22);
  border-radius: 12px;
  background: rgba(255,255,255,.18);
}

.stat {
  padding: 18px 20px;
  background: rgba(0,61,43,.62);
}

.stat dt {
  color: rgba(255,255,255,.68);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: .08em;
}

.stat dd {
  margin: 2px 0 0;
  font-size: 1.3rem;
  font-weight: 800;
}

.section { padding: 96px 0; }

.section h2 {
  margin: 8px 0 0;
  font-size: clamp(2.1rem, 4vw, 3.4rem);
}

.intro-section { padding-block: 86px; }

.intro-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 90px;
  align-items: start;
}

.intro-copy {
  color: var(--muted);
  font-size: 1.05rem;
}

.intro-copy p:first-child {
  margin-top: 8px;
  color: var(--ink);
  font-weight: 600;
}

.section-tinted { background: var(--surface-soft); }

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 50px;
  margin-bottom: 42px;
}

.section-heading > p {
  max-width: 500px;
  margin: 0 0 8px;
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.research-card {
  position: relative;
  min-height: 300px;
  padding: 32px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: white;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.research-card:hover {
  transform: translateY(-4px);
  border-color: #b7cac0;
  box-shadow: var(--shadow);
}

.research-card::after {
  content: attr(data-index);
  position: absolute;
  right: 22px;
  bottom: -26px;
  color: rgba(0,82,57,.055);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 8rem;
  font-weight: 700;
  line-height: 1;
}

.research-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  color: var(--mason-green);
  background: var(--mason-green-light);
  font-weight: 800;
}

.research-card h3 {
  margin: 28px 0 10px;
  font-size: 1.35rem;
}

.research-card p {
  max-width: 90%;
  margin: 0;
  color: var(--muted);
}

.featured-project {
  color: white;
  background: var(--dark);
}

.project-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 90px;
  align-items: center;
}

.project-visual {
  position: relative;
  aspect-ratio: 1 / .78;
  min-height: 390px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 20px;
  background:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px),
    radial-gradient(circle at 50% 55%, #0a6a4b, #061a14 60%);
  background-size: 34px 34px, 34px 34px, auto;
}

.earth-disc {
  position: absolute;
  width: 230px;
  height: 230px;
  left: 50%;
  top: 54%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, rgba(255,255,255,.45), transparent 5%),
    radial-gradient(circle at 60% 40%, #62a985 0 12%, transparent 13%),
    radial-gradient(circle at 38% 60%, #82b59c 0 16%, transparent 17%),
    radial-gradient(circle at 50% 50%, #265f4b, #0c3e2d 70%);
  box-shadow:
    inset -30px -20px 50px rgba(0,0,0,.4),
    0 0 60px rgba(80,190,135,.25);
}

.orbit {
  position: absolute;
  left: 50%;
  top: 54%;
  border: 1px solid rgba(255,199,51,.68);
  border-radius: 50%;
}

.orbit-one {
  width: 360px;
  height: 160px;
  transform: translate(-50%, -50%) rotate(-20deg);
}

.orbit-two {
  width: 370px;
  height: 170px;
  transform: translate(-50%, -50%) rotate(62deg);
  border-color: rgba(255,255,255,.35);
}

.data-node {
  position: absolute;
  width: 12px;
  height: 12px;
  border: 3px solid var(--mason-gold);
  border-radius: 50%;
  background: white;
  box-shadow: 0 0 18px var(--mason-gold);
}

.node-one { left: 22%; top: 33%; }
.node-two { right: 20%; top: 30%; }
.node-three { right: 31%; bottom: 19%; }

.project-copy h2 { margin-bottom: 24px; }

.project-copy p {
  color: rgba(255,255,255,.74);
  font-size: 1.05rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  padding: 0;
  margin: 28px 0;
  list-style: none;
}

.tag-list li {
  padding: 7px 10px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 999px;
  color: rgba(255,255,255,.8);
  font-size: .78rem;
  font-weight: 600;
}

.text-link {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  color: var(--mason-green);
  font-weight: 750;
  text-decoration: none;
}

.project-copy .text-link,
.light-link { color: var(--mason-gold); }

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-bottom: 30px;
}

.filter-button {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: white;
  font-weight: 650;
  cursor: pointer;
}

.filter-button.active,
.filter-button:hover {
  color: white;
  border-color: var(--mason-green);
  background: var(--mason-green);
}

.people-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.person-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: white;
}

.person-image {
  aspect-ratio: 10 / 11;
  display: grid;
  place-items: center;
  color: rgba(255,255,255,.9);
  background:
    linear-gradient(135deg, rgba(255,255,255,.14), transparent),
    var(--mason-green);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 3.2rem;
  font-weight: 700;
}

.person-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.person-image.image-fallback {
  color: rgba(255,255,255,.9);
}

.person-body { padding: 23px; }

.person-role {
  color: var(--mason-green);
  font-size: .74rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.person-card h3 {
  margin: 6px 0 8px;
  font-size: 1.2rem;
}

.person-card p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: .9rem;
}

.section-dark {
  color: white;
  background: var(--dark);
}

.section-heading-light > p { color: rgba(255,255,255,.65); }

.publication-list {
  border-top: 1px solid rgba(255,255,255,.14);
}

.publication-item {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  gap: 28px;
  align-items: start;
  padding: 28px 0;
  border-bottom: 1px solid rgba(255,255,255,.14);
}

.publication-year {
  color: var(--mason-gold);
  font-weight: 800;
}

.publication-item h3 {
  margin: 0 0 7px;
  font-size: 1.05rem;
  line-height: 1.45;
}

.publication-item p {
  margin: 0;
  color: rgba(255,255,255,.62);
  font-size: .9rem;
}

.publication-type {
  padding: 6px 9px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 6px;
  color: rgba(255,255,255,.72);
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.news-card {
  display: flex;
  min-height: 300px;
  flex-direction: column;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: white;
}

.news-meta {
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  font-size: .76rem;
  font-weight: 650;
}

.news-type {
  color: var(--mason-green);
  font-weight: 800;
  text-transform: uppercase;
}

.news-card h3 {
  margin: 28px 0 12px;
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.42rem;
  line-height: 1.25;
}

.news-card p {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: .9rem;
}

.news-card .text-link { margin-top: auto; }

.news-pagination {
  display: flex;
  justify-content: center;
  gap: 9px;
  margin-top: 32px;
}

.news-pagination[hidden] { display: none; }

.page-button {
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--muted);
  background: white;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.page-button:hover,
.page-button:focus-visible,
.page-button.active {
  color: white;
  border-color: var(--mason-green);
  background: var(--mason-green);
}

.opportunity-section {
  padding-top: 0;
}

.opportunity-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 50px;
  padding: 48px;
  border-radius: 18px;
  background: var(--mason-green-light);
}

.opportunity-card p {
  max-width: 720px;
  margin-bottom: 0;
  color: var(--muted);
}

.contact-section {
  color: white;
  background: var(--mason-green);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
}

.contact-section .section-kicker { color: var(--mason-gold); }

.contact-section p { color: rgba(255,255,255,.72); }

.contact-links {
  display: grid;
  align-content: start;
}

.contact-links a {
  padding: 15px 0;
  border-bottom: 1px solid rgba(255,255,255,.22);
  color: white;
  font-weight: 650;
  text-decoration: none;
}

.site-footer {
  padding: 28px 0;
  color: rgba(255,255,255,.6);
  background: #061a14;
  font-size: .78rem;
}

.footer-wrap {
  display: flex;
  justify-content: space-between;
  gap: 24px;
}

.footer-wrap p { margin: 0; }

:focus-visible {
  outline: 3px solid var(--mason-gold);
  outline-offset: 3px;
}

@media (max-width: 900px) {
  .menu-button { display: block; }

  .site-nav {
    position: fixed;
    inset: 78px 0 auto 0;
    display: none;
    height: calc(100vh - 78px);
    padding: 28px 20px;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    background: white;
  }

  .site-nav.open { display: flex; }

  .site-nav a {
    padding: 13px 12px;
    border-bottom: 1px solid var(--line);
    font-size: 1rem;
  }

  .site-nav .nav-cta {
    margin-top: 10px;
    text-align: center;
  }

  .intro-grid,
  .project-layout,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 46px;
  }

  .people-grid,
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .project-visual { min-height: 340px; }
}

@media (max-width: 680px) {
  .container { width: min(calc(100% - 28px), var(--max-width)); }

  .brand-text strong { font-size: .82rem; }
  .brand-text small { font-size: .64rem; }

  .hero { min-height: auto; }
  .hero-content { padding-block: 86px 64px; }
  .hero h1 { font-size: clamp(2.65rem, 14vw, 4.1rem); }
  .hero-stats { grid-template-columns: 1fr; }
  .stat { padding: 13px 16px; }

  .section { padding: 70px 0; }

  .section-heading {
    align-items: start;
    flex-direction: column;
    gap: 18px;
    margin-bottom: 30px;
  }

  .card-grid,
  .people-grid,
  .news-grid {
    grid-template-columns: 1fr;
  }

  .research-card { min-height: 260px; }

  .project-visual { min-height: 300px; }
  .earth-disc { width: 170px; height: 170px; }
  .orbit-one { width: 275px; height: 125px; }
  .orbit-two { width: 285px; height: 135px; }

  .publication-item {
    grid-template-columns: 64px 1fr;
    gap: 15px;
  }

  .publication-type {
    grid-column: 2;
    justify-self: start;
  }

  .opportunity-card {
    align-items: stretch;
    flex-direction: column;
    padding: 30px 24px;
  }

  .footer-wrap {
    flex-direction: column;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}


/* Join Us page */
.subpage-hero {
  position: relative;
  overflow: hidden;
  color: white;
  background: linear-gradient(120deg, var(--mason-green-deep), var(--mason-green));
}

.subpage-hero::after {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  right: -130px;
  bottom: -260px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 50%;
  box-shadow: 0 0 0 72px rgba(255,255,255,.025), 0 0 0 145px rgba(255,255,255,.018);
}

.subpage-hero-inner { position: relative; z-index: 1; padding: 92px 0 88px; }
.subpage-hero h1 {
  max-width: 820px;
  margin: 14px 0 20px;
  font-family: "Source Serif 4", Georgia, serif;
  font-size: clamp(3rem, 7vw, 5.4rem);
  line-height: 1.04;
  letter-spacing: -.04em;
}
.subpage-hero p { max-width: 790px; margin: 0; color: rgba(255,255,255,.8); font-size: 1.16rem; }

.join-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; align-items: start; }
.join-layout h2, .prospective-note h2, .faq-heading h2 {
  margin: 8px 0 0;
  font-family: "Source Serif 4", Georgia, serif;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: -.035em;
}
.join-copy > p { margin-top: 4px; font-size: 1.06rem; color: var(--muted); }
.numbered-themes { margin: 26px 0 0; padding: 0; list-style: none; counter-reset: themes; }
.numbered-themes li { position: relative; padding: 20px 0 20px 58px; border-top: 1px solid var(--line); counter-increment: themes; }
.numbered-themes li:last-child { border-bottom: 1px solid var(--line); }
.numbered-themes li::before {
  content: counter(themes, decimal-leading-zero);
  position: absolute; left: 0; top: 19px; color: var(--mason-green); font-weight: 800; font-size: .78rem;
}

.prospective-note { display: grid; grid-template-columns: 1fr .95fr; gap: 70px; align-items: start; }
.prospective-note > div:first-child > p { color: var(--muted); max-width: 620px; }
.contact-checklist { padding: 30px; border: 1px solid #cbdcd3; border-radius: 15px; background: white; box-shadow: var(--shadow); }
.contact-checklist h3 { margin-top: 0; }
.contact-checklist ul { padding-left: 20px; margin: 0 0 26px; color: var(--muted); }
.contact-checklist li { margin: 8px 0; }

.faq-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: 78px; align-items: start; }
.faq-heading { position: sticky; top: 110px; }
.faq-heading > p { color: var(--muted); }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; padding: 24px 46px 24px 0; cursor: pointer; font-weight: 750; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 4px; top: 20px; color: var(--mason-green); font-size: 1.5rem; font-weight: 500; }
.faq-list details[open] summary::after { content: "–"; }
.faq-list details p { max-width: 780px; margin: -4px 50px 25px 0; color: var(--muted); }

.join-cta-section { padding-top: 0; }
.join-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.button-outline-dark { border-color: #aabfb4; color: var(--mason-green-deep); background: transparent; }

@media (max-width: 900px) {
  .join-layout, .prospective-note, .faq-layout { grid-template-columns: 1fr; gap: 42px; }
  .faq-heading { position: static; }
}

@media (max-width: 680px) {
  .subpage-hero-inner { padding: 72px 0 68px; }
  .contact-checklist { padding: 24px; }
  .numbered-themes li { padding-left: 46px; }
  .join-actions { flex-direction: column; }
}


/* Cross-disciplinary research gateway and collaboration pages */
.collaboration-gateway { background: #fff; }
.collaboration-card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.collaboration-card {
  position: relative; min-height: 310px; display: flex; flex-direction: column; justify-content: space-between; gap: 30px;
  padding: 30px; overflow: hidden; border: 1px solid var(--line); border-radius: 16px; background: var(--surface);
  text-decoration: none;
}
.collaboration-card::before { content: ""; position: absolute; inset: 0 auto auto 0; width: 100%; height: 4px; background: var(--mason-green); }
.collaboration-code {
  width: fit-content; min-width: 52px; height: 52px; display: grid; place-items: center; padding: 0 11px; border-radius: 11px;
  color: var(--mason-green-deep); background: var(--mason-green-light); font-size: .78rem; font-weight: 800; letter-spacing: .04em;
}
.collaboration-overline { color: var(--mason-green); font-size: .69rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.collaboration-card h3 { margin: 7px 0 10px; font-family: "Source Serif 4", Georgia, serif; font-size: 1.7rem; line-height: 1.1; letter-spacing: -.025em; }
.collaboration-card p { margin: 0; color: var(--muted); font-size: .94rem; }
.collaboration-arrow { align-self: flex-end; color: var(--mason-green); font-size: 1.5rem; font-weight: 700; }

.collab-hero { position: relative; overflow: hidden; color: white; background: linear-gradient(125deg, #062c20 0%, var(--mason-green) 64%, #086849 100%); }
.collab-hero-grid { position: absolute; inset: 0; opacity: .1; background-image: linear-gradient(rgba(255,255,255,.2) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.2) 1px, transparent 1px); background-size: 56px 56px; }
.collab-hero-layout { position: relative; z-index: 1; min-height: 610px; display: grid; grid-template-columns: 1.3fr .7fr; gap: 70px; align-items: center; padding-block: 88px; }
.collab-hero-copy h1 { max-width: 850px; margin: 15px 0 22px; font-family: "Source Serif 4", Georgia, serif; font-size: clamp(3rem, 6.7vw, 5.6rem); line-height: 1.02; letter-spacing: -.045em; }
.collab-hero-copy > p { max-width: 780px; margin: 0; color: rgba(255,255,255,.82); font-size: 1.15rem; }
.collab-emblem { justify-self: end; width: 250px; aspect-ratio: 1; display: grid; place-items: center; align-content: center; gap: 8px; border: 1px solid rgba(255,255,255,.26); border-radius: 50%; box-shadow: 0 0 0 35px rgba(255,255,255,.025), 0 0 0 72px rgba(255,255,255,.018); text-align: center; }
.collab-emblem span { color: var(--mason-gold); font-family: "Source Serif 4", Georgia, serif; font-size: 3.4rem; font-weight: 700; letter-spacing: -.05em; }
.collab-emblem small { color: rgba(255,255,255,.63); font-size: .72rem; font-weight: 700; letter-spacing: .1em; line-height: 1.45; text-transform: uppercase; }
.collab-note { padding-left: 18px; border-left: 3px solid var(--mason-gold); color: var(--ink) !important; font-weight: 600; }
.collab-topic-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.collab-topic-card { min-height: 250px; padding: 30px; border: 1px solid #d4e1da; border-radius: 15px; background: white; }
.collab-number { color: var(--mason-green); font-size: .72rem; font-weight: 800; letter-spacing: .12em; }
.collab-topic-card h3 { margin: 30px 0 10px; font-family: "Source Serif 4", Georgia, serif; font-size: 1.65rem; line-height: 1.12; }
.collab-topic-card p { margin: 0; color: var(--muted); }
.collab-methods-section { background: #fff; }
.collab-two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.collab-panel { min-height: 510px; padding: 44px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface-soft); }
.collab-panel-dark { color: white; background: var(--dark); border-color: var(--dark); }
.collab-panel h2 { max-width: 520px; font-size: clamp(2.05rem, 4vw, 3.25rem); }
.method-list { display: flex; flex-wrap: wrap; gap: 10px; margin: 42px 0 0; padding: 0; list-style: none; }
.method-list li { padding: 10px 13px; border: 1px solid rgba(255,255,255,.19); border-radius: 999px; color: rgba(255,255,255,.78); font-size: .85rem; }
.question-list { margin: 35px 0 0; padding: 0; list-style: none; counter-reset: qs; }
.question-list li { position: relative; padding: 17px 0 17px 45px; border-top: 1px solid var(--line); counter-increment: qs; }
.question-list li:last-child { border-bottom: 1px solid var(--line); }
.question-list li::before { content: counter(qs, decimal-leading-zero); position: absolute; left: 0; top: 18px; color: var(--mason-green); font-size: .72rem; font-weight: 800; }
.related-section { padding-top: 30px; }
.related-collab-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.related-collab { display: grid; grid-template-columns: 1fr auto; gap: 7px 20px; padding: 26px 28px; border: 1px solid var(--line); border-radius: 14px; text-decoration: none; }
.related-collab span:first-child { grid-column: 1 / -1; color: var(--mason-green); font-size: .68rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.related-collab strong { font-family: "Source Serif 4", Georgia, serif; font-size: 1.35rem; }
.related-collab span:last-child { color: var(--mason-green); font-size: 1.3rem; }
.related-collab:hover { border-color: #b9ccc2; box-shadow: 0 10px 28px rgba(16,37,30,.08); }
.site-nav a[aria-current="page"] { color: var(--mason-green); }

@media (max-width: 900px) {
  .collaboration-card-grid { grid-template-columns: 1fr; }
  .collaboration-card { min-height: 240px; }
  .collab-hero-layout { min-height: auto; grid-template-columns: 1fr; gap: 45px; }
  .collab-emblem { justify-self: start; width: 190px; }
  .collab-topic-grid, .collab-two-column { grid-template-columns: 1fr; }
  .collab-panel { min-height: auto; }
}
@media (max-width: 680px) {
  .collab-hero-layout { padding-block: 72px 74px; }
  .collab-emblem { display: none; }
  .collab-topic-grid, .related-collab-grid { grid-template-columns: 1fr; }
  .collab-topic-card, .collab-panel { padding: 26px 24px; }
}

/* Give student instructions more room for questions and longer answers. */
#student-instructions .faq-layout {
  grid-template-columns: minmax(0, .55fr) minmax(0, 1.45fr);
  gap: 48px;
}

#student-instructions .faq-list details p {
  max-width: none;
  margin-right: 0;
  text-align: justify;
}

@media (max-width: 900px) {
  #student-instructions .faq-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 42px;
  }
}