/* ===== CSS Variables ===== */
:root {
  --navy: #1a2e4a;
  --navy-light: #243d62;
  --teal: #0d9488;
  --teal-dark: #0b7a71;
  --teal-light: #e6f9f7;
  --white: #ffffff;
  --gray-50: #f8f9fa;
  --gray-100: #f1f3f5;
  --gray-200: #e2e8f0;
  --gray-400: #94a3b8;
  --gray-600: #64748b;
  --gray-800: #1e293b;
  --text: #1f2937;
  --text-muted: #6b7280;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 4px rgba(0, 0, 0, 0.08), 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

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

/* ===== Layout ===== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-narrow {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.text-center { text-align: center; }

/* ===== Navigation ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: 14px 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-brand {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--navy);
  letter-spacing: 0.01em;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  white-space: nowrap;
}

.btn:hover { text-decoration: none; }
.btn:active { transform: scale(0.98); }

.btn-nav {
  background: var(--navy);
  color: var(--white);
  padding: 8px 18px;
  font-size: 0.85rem;
}
.btn-nav:hover { background: var(--navy-light); }

.btn-primary {
  background: var(--teal);
  color: var(--white);
  font-size: 1rem;
  box-shadow: 0 2px 8px rgba(13, 148, 136, 0.35);
}
.btn-primary:hover {
  background: var(--teal-dark);
  box-shadow: 0 4px 12px rgba(13, 148, 136, 0.45);
}

.btn-large {
  padding: 14px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius);
}

.btn-share {
  background: var(--white);
  color: var(--navy);
  border: 1.5px solid var(--gray-200);
  font-size: 0.9rem;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}
.btn-share:hover {
  border-color: var(--teal);
  color: var(--teal);
  box-shadow: 0 2px 8px rgba(13, 148, 136, 0.15);
}

.share-btn-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(150deg, var(--navy) 0%, #1e3a5c 60%, #1d4065 100%);
  color: var(--white);
  padding: 80px 0 90px;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 24px;
  max-width: 760px;
}

.inst-badges {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.inst-badge {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: rgba(255, 255, 255, 0.9);
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.inst-sep {
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.8rem;
}


.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--white);
}

.hero-sub {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.6;
  max-width: 620px;
}

/* Trust badges */
.trust-row {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.trust-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 8px 14px;
  border-radius: 100px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.92);
}

.trust-icon {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  color: var(--teal);
  filter: brightness(1.3);
}

/* ===== Sections ===== */
.section-white { background: var(--white); padding: 80px 0; }
.section-light  { background: var(--gray-50); padding: 80px 0; }

/* CV Definition Callout */
.callout-box {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--teal);
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: var(--shadow-sm);
  max-width: 800px;
  margin: 0 auto;
}

.callout-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: var(--teal-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--teal);
  padding: 10px;
}
.callout-icon svg { width: 100%; height: 100%; }

.callout-box h2 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 8px;
}

.callout-box p { font-size: 0.95rem; color: var(--text); line-height: 1.65; }
.callout-box p + p { margin-top: 8px; }

.callout-note {
  font-size: 0.85rem !important;
  color: var(--text-muted) !important;
  font-style: italic;
}

/* Video embed */
.video-wrap {
  margin: 48px auto 0;
  max-width: 900px;
  background: var(--navy);
  border-radius: 14px;
  padding: 28px 32px 32px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.18);
}

.video-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--teal);
  margin-bottom: 14px;
  text-align: center;
  filter: brightness(1.3);
}

.video-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  text-align: center;
  margin-bottom: 18px;
  line-height: 1.4;
}

.video-frame {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 16px rgba(0,0,0,0.35);
}

.video-frame iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* PI headshot cards */
.pi-cards {
  display: flex;
  gap: 16px;
  margin: 24px 0;
  flex-wrap: wrap;
}

.pi-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 12px 16px;
  flex: 1;
  min-width: 200px;
}

.pi-photo {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  object-fit: cover;
  object-position: top center;
  flex-shrink: 0;
  border: 2px solid var(--gray-200);
}

.pi-name {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--navy);
}

.pi-role {
  font-size: 0.76rem;
  color: var(--teal);
  font-weight: 600;
  margin-top: 1px;
}

.pi-inst {
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 1px;
}

/* About section — two column */
.two-col {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 60px;
  align-items: start;
}

.section-label {
  display: inline-block;
  text-transform: uppercase;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--teal);
  margin-bottom: 10px;
}

.two-col-main h2,
.section-narrow h2 {
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 18px;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.two-col-main p + p { margin-top: 14px; }
.two-col-main p { color: var(--text); }

/* Topics sidebar */
.topics-heading {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 14px;
}

.topic-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.topic-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--gray-800);
  padding: 7px 12px;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
}

.topic-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: var(--teal);
  color: var(--white);
  font-size: 0.72rem;
  font-weight: 700;
  border-radius: 4px;
  flex-shrink: 0;
}

.eligibility-body {
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.75;
}

/* Impact section */
.impact-quote {
  border-left: 4px solid var(--teal);
  padding-left: 24px;
  margin: 24px 0;
  font-size: 1.05rem;
  color: var(--navy);
  line-height: 1.7;
  font-style: italic;
}

.impact-body {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* CTA section */
.section-cta {
  background: var(--navy);
  color: var(--white);
  padding: 80px 0;
}

.section-cta h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.section-cta p {
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 28px;
  font-size: 1rem;
}

.cta-note {
  margin-top: 14px !important;
  font-size: 0.8rem !important;
  color: rgba(255, 255, 255, 0.45) !important;
}

/* Share section */
.copy-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--white);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 6px 6px 6px 16px;
  margin-top: 28px;
  box-shadow: var(--shadow-sm);
}

.copy-bar-url {
  flex: 1;
  font-size: 0.85rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: left;
  font-family: 'SF Mono', 'Fira Mono', 'Consolas', monospace;
  letter-spacing: 0.01em;
  min-width: 0;
}

.copy-bar-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--teal);
  color: var(--white);
  font-size: 0.83rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.15s, box-shadow 0.15s;
  box-shadow: 0 1px 4px rgba(13, 148, 136, 0.3);
}

.copy-bar-btn:hover {
  background: var(--teal-dark);
  box-shadow: 0 2px 8px rgba(13, 148, 136, 0.4);
}

.copy-bar-btn svg {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
}

.share-row {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 16px;
}

.share-row .section-label { display: block; }
.share-row h2 { margin-bottom: 8px; }

/* Research team */
.inst-row {
  display: flex;
  align-items: center;
  gap: 24px;
  margin: 24px 0 20px;
  flex-wrap: wrap;
}

.inst-block {
  display: flex;
  flex-direction: column;
}

.inst-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--navy);
}

.inst-detail {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.inst-divider {
  font-size: 1.2rem;
  color: var(--gray-400);
  font-weight: 300;
}

.author-list {
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 24px;
  line-height: 1.8;
}

.contact-box {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.contact-box a {
  color: var(--teal);
  font-weight: 500;
}

.irb-note {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.irb-num {
  font-style: italic;
}

/* Privacy & Compliance */
.section-compliance {
  background: var(--gray-100);
  padding: 64px 0;
  border-top: 1px solid var(--gray-200);
}

.section-compliance h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 20px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.section-compliance p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.75;
}

.section-compliance p + p {
  margin-top: 14px;
}

/* Footer */
.footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.55);
  padding: 28px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
  text-align: center;
  font-size: 0.82rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .section-white, .section-light, .section-cta { padding: 56px 0; }
  .hero { padding: 56px 0 64px; }

  .two-col {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-inner { gap: 20px; }

  .trust-row { gap: 12px; }
  .trust-badge { font-size: 0.8rem; padding: 7px 12px; }

  .share-row { flex-direction: row; }
  .copy-bar-url { font-size: 0.78rem; padding: 10px 12px; }

  .inst-row { flex-direction: column; gap: 12px; }
  .inst-divider { display: none; }

  .pi-cards { flex-direction: column; }
  .pi-card { min-width: unset; }

  .video-wrap { padding: 20px 18px 22px; border-radius: 10px; }
}

@media (max-width: 480px) {
  .container { padding: 0 18px; }
  .hero h1 { font-size: 1.6rem; }
  .nav-brand { font-size: 0.8rem; }
  .btn-large { padding: 12px 24px; font-size: 0.95rem; }
  .callout-box { flex-direction: column; gap: 16px; }
}