/* ============================================================
   Social Coordination Lab — socialcoordinationlab.com
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@300;400;500;600;700&display=swap');

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --navy:       #1C3A72;
  --teal:       #1CAABC;
  --teal-dark:  #137F8E;
  --teal-light: #EBF8FA;
  --teal-mid:   #A8E0E9;
  --text:       #1A202C;
  --muted:      #6B7280;
  --border:     #E2E8F0;
  --bg:         #FFFFFF;
  --bg-alt:     #F7FAFC;
  --max-w:      1100px;
  --nav-h:      104px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

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

/* ---- Navigation — frosted glass ---- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(28,170,188,0.25);
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transform: translateY(-100%);
  transition: transform 0.3s ease;
  pointer-events: none;
}
.site-nav.nav-visible {
  transform: translateY(0);
  pointer-events: auto;
}

.nav-inner {
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.nav-brand {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}
.nav-brand-logo {
  height: 42px;
  width: auto;
  display: block;
}
.nav-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}
.nav-brand a {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.01em;
  text-decoration: none;
}
.nav-brand a:hover { color: var(--teal); }
.nav-brand-sub {
  font-size: 0.88rem;
  color: var(--muted);
  font-weight: 400;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.1rem;
  flex-shrink: 0;
}
.nav-links a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.nav-links a:hover { background: var(--teal-light); color: var(--teal-dark); }
.nav-links a.active { color: var(--teal-dark); font-weight: 600; background: var(--teal-light); }

/* ---- Page wrapper ---- */
.page {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ---- Hero (home) ---- */
.hero-band {
  background: linear-gradient(to bottom, #C8EBF2 0%, #D8EEF5 30%, #EBF2FA 65%, #fff 100%);
  padding: 2rem 0.75rem 0.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.hero-band img {
  width: 750px;
  max-width: 96%;
}
.hero-affil {
  font-size: 1rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  font-weight: 500;
  text-transform: uppercase;
}

.hero-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 7rem 2rem 5.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.hero-content p {
  font-size: 1.05rem;
  color: #374151;
  line-height: 1.75;
  margin-bottom: 0.9rem;
  max-width: 72ch;
}
.hero-content .hero-lead {
  font-size: 2.25rem;
  max-width: 1400px;
  color: var(--teal-dark);
  font-weight: 400;
  font-weight: 700;
}
.hero-content .hero-subhead {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--navy);
  text-align: left;
  width: 100%;
  max-width: none;
  padding-left: 1.25rem;
}
.hero-list {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0.9rem;
  width: 100%;
  text-align: left;
}
.hero-list li {
  font-size: 1.25rem;
  color: #374151;
  line-height: 1.75;
  padding: 0.4rem 0 0.4rem 1.25rem;
  position: relative;
}
.hero-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 1rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
}

.hero-rule {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 2rem 0;
  width: 100%;
  justify-content: center;
}
.hero-rule::before, .hero-rule::after {
  content: '';
  flex: 1;
  max-width: 80px;
  height: 1.5px;
}
.hero-rule::before { background: linear-gradient(90deg, transparent, var(--teal)); }
.hero-rule::after  { background: linear-gradient(90deg, var(--teal), transparent); }
.hero-rule-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--teal);
  opacity: 0.7;
}

/* ---- Buttons ---- */
.hero-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.btn {
  display: inline-block;
  padding: 0.58rem 1.4rem;
  border-radius: 30px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: 'DM Sans', sans-serif;
  transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.12s;
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }

.btn-primary {
  background: var(--teal);
  color: #fff;
  border: 2px solid var(--teal);
}
.btn-primary:hover { background: var(--teal-dark); border-color: var(--teal-dark); }

.btn-outline {
  background: transparent;
  color: var(--navy);
  border: 2px solid rgba(28,58,114,0.35);
}
.btn-outline:hover { border-color: var(--navy); }

/* ---- Page title (interior pages) ---- */
.page-title-band {
  background: linear-gradient(to bottom, #C8EBF2 0%, #D8EEF5 30%, #EBF2FA 65%, #fff 100%);
  padding: calc(var(--nav-h) + 2rem) 2rem 0;
  margin-bottom: 2.5rem;
}
.page-title-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-bottom: 2rem;
}
.page-title-band h1 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}
.page-title-band p {
  color: var(--muted);
  max-width: 65ch;
  font-size: 1rem;
  margin-top: 0.5rem;
}

.divider {
  width: 48px;
  height: 4px;
  background: linear-gradient(90deg, var(--teal), var(--teal-dark));
  border-radius: 2px;
  margin: 0.6rem 0 0;
}

/* ---- Research cards ---- */
.research-icons {
  display: flex;
  gap: 3rem;
  padding-bottom: 5rem;
  align-items: flex-start;
  flex-wrap: wrap;
}

.research-icon-item {
  flex: 1;
  min-width: 200px;
}

.research-icon-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  background: none;
  border: none;
  cursor: pointer;
  width: 100%;
  padding: 0.75rem 0.5rem;
  border-radius: 10px;
  transition: background 0.15s;
  font-family: 'DM Sans', sans-serif;
}
.research-icon-btn:hover { background: var(--teal-light); }
.research-icon-btn.active { background: var(--teal-light); }

.research-icon-btn img {
  height: 220px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  border-radius: 8px;
}

.research-icon-btn span {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--navy);
  text-align: center;
  line-height: 1.3;
}

.research-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  width: 100%;
  scroll-margin-top: var(--nav-h);
}
.research-panel.open {
  max-height: 2800px;
}
.research-panel .panel-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--navy);
  margin: 0;
  padding-top: 1.5rem;
}
.research-panel p {
  color: #4B5563;
  font-size: 1.25rem;
  line-height: 1.75;
  margin-bottom: 0.75rem;
  padding-top: 1.5rem;
}
.research-panel .panel-coverage {
  font-size: 1.1rem;
  padding-top: 0.4rem;
  margin-bottom: 0;
}
.research-panel .panel-coverage a {
  color: var(--teal-dark);
}
.research-panel .panel-coverage a:hover {
  color: var(--teal);
}
.research-panel .panel-figure {
  display: block;
  margin: 1.5rem auto 0;
  max-width: 55%;
  border-radius: 4px;
}
.research-panel .panel-subsection-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--navy);
  margin: 3rem 0 0;
  padding-top: 0;
}
.research-panel .pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
}
.pub-previews {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 3rem;
  margin-top: 1.25rem;
  padding-bottom: 1.5rem;
}
.pub-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  max-width: 220px;
}
.pub-preview img {
  width: 220px;
  height: 180px;
  object-fit: cover;
  object-position: top;
  border: 1px solid #d1d5db;
  border-radius: 4px;
  display: block;
  transition: border-color 0.2s;
}
.pub-preview:hover img {
  border-color: var(--teal);
}
.pub-preview span {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--teal-dark);
}
.pub-preview:hover span {
  color: var(--teal);
  text-decoration: underline;
}
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
  padding-bottom: 1rem;
}

.tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--teal-dark);
  background: var(--teal-light);
  padding: 0.2rem 0.65rem;
  border-radius: 20px;
}

/* ---- Intro blurb ---- */
.intro-blurb {
  color: #374151;
  font-size: 1.25rem;
  line-height: 1.75;
  margin-bottom: 3rem;
  max-width: 1100px;
}

/* ---- People ---- */
.people-section { margin-bottom: 4rem; }

.section-label {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--teal);
}

.person-pi {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2.5rem;
  align-items: start;
}
.person-pi img {
  width: 250px;
  height: 250px;
  object-fit: cover;
  border-radius: 0;
}
.person-photo-col {
  display: flex;
  flex-direction: column;
  width: 250px;
}
.person-info h3 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.2rem;
}
.person-info .person-title {
  font-size: 1rem;
  color: var(--teal-dark);
  font-weight: 500;
  margin-bottom: 1rem;
}
.person-info p {
  color: #374151;
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: 0.75rem;
}

.person-links { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.person-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--teal-dark);
  border: 1.5px solid var(--teal);
  padding: 0.3rem 0.9rem;
  border-radius: 20px;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.person-link:hover { background: var(--teal); color: #fff; text-decoration: none; }

.people-placeholder {
  background: var(--teal-light);
  border: 1px solid var(--teal-mid);
  border-radius: 6px;
  padding: 0.6rem 1rem;
  text-align: left;
  font-style: italic;
  color: #374151;
  display: inline-block;
}
.people-placeholder p { font-size: 1.1rem; }
.people-placeholder a { color: var(--teal-dark); font-weight: 600; }

/* ---- Publications ---- */
.pub-section { margin-bottom: 3.5rem; }

.pub-section-label {
  display: block;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 1.25rem;
  padding-bottom: 0.45rem;
  border-bottom: 3px solid var(--teal);
}

.pub-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.pub-item {
  padding: 0.5rem 0;
  font-size: 0.93rem;
  color: #374151;
  line-height: 1.65;
}
.pub-item strong { color: var(--navy); }

.pub-item .pub-links { margin-top: 0.5rem; display: flex; flex-wrap: wrap; gap: 0.4rem; }
.pub-link {
  font-size: 0.77rem;
  font-weight: 600;
  color: var(--teal-dark);
  border: 1.5px solid var(--teal);
  padding: 0.12rem 0.55rem;
  border-radius: 20px;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.pub-link:hover { background: var(--teal); color: #fff; text-decoration: none; }

.pub-coverage { font-size: 0.93rem; color: var(--muted); margin-top: 0.35rem; }
.pub-coverage a { color: var(--teal-dark); }

/* ---- Join ---- */
.join-section {
  margin-bottom: 2.5rem;
}


.join-section h2 { font-size: 1.35rem; font-weight: 700; color: var(--navy); margin-bottom: 1rem; }
.join-section p { color: #374151; font-size: 0.97rem; line-height: 1.7; margin-bottom: 0.85rem; }
.join-section .btn { margin-top: 0.5rem; }

.join-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.7rem;
  border-radius: 20px;
  margin-bottom: 0.75rem;
  letter-spacing: 0.02em;
  background: #D1FAE5;
  color: #065F46;
}
.join-badge.closed { background: #FEE2E2; color: #991B1B; }

/* ---- Footer ---- */
.site-footer {
  margin-top: 5rem;
  padding: 2.5rem 2rem;
  background: var(--teal-light);
  border-top: 3px solid var(--teal);
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-brand { font-size: 0.95rem; font-weight: 700; color: var(--navy); }
.footer-meta  { font-size: 0.82rem; color: var(--teal-dark); }
.footer-links { display: flex; gap: 1rem; font-size: 0.85rem; }
.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--teal-dark); text-decoration: none; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .hero-band img { width: 320px; }
  .hero-content { padding: 2.5rem 1.5rem 4rem; }

  .nav-inner { padding: 0 1rem; }
  .nav-brand-sub { display: none; }
  .nav-links a { padding: 0.4rem 0.55rem; font-size: 0.8rem; }

  .person-pi { grid-template-columns: 1fr; text-align: center; }
  .person-pi img { margin: 0 auto; }
  .person-links { justify-content: center; }

  .page { padding: 0 1.25rem; }
  .page-title-band { padding: 2rem 1.25rem 0; }
  .join-section { padding: 1.75rem 1.25rem; }

  .footer-inner { flex-direction: column; text-align: center; }
  .footer-links { justify-content: center; }
}