/* ============================================================
   style.css — Vogel Group Component Styles
   ============================================================ */

/* ---- UTILITY ---- */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.container--narrow { max-width: var(--content-default); }

/* ============================================================
   HEADER / NAV
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow 0.3s var(--ease-out);
}
.site-header--scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* Logo */
.logo { display: flex; align-items: center; gap: var(--space-3); text-decoration: none; color: var(--color-text); }
.logo svg { width: 40px; height: 40px; flex-shrink: 0; }
.logo-text { font-family: var(--font-display); font-weight: 700; font-size: var(--text-lg); letter-spacing: -0.02em; }

/* Desktop Nav */
.nav-desktop { display: flex; align-items: center; gap: var(--space-1); }
.nav-desktop a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.nav-desktop a:hover, .nav-desktop a.active {
  color: var(--color-text);
  background: var(--color-primary-muted);
}

/* Theme toggle */
.theme-toggle {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-primary-muted);
}

/* Hamburger */
.hamburger {
  display: none;
  width: 38px; height: 38px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: var(--radius-md);
}
.hamburger span {
  display: block; width: 20px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease-out), opacity 0.3s var(--ease-out);
}
.hamburger.is-active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.is-active span:nth-child(2) { opacity: 0; }
.hamburger.is-active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Nav */
.nav-mobile {
  display: none;
  position: fixed;
  top: 64px; left: 0; right: 0; bottom: 0;
  background: var(--color-bg);
  z-index: 99;
  padding: var(--space-8) var(--space-6);
  overflow-y: auto;
}
.nav-mobile.is-open { display: flex; flex-direction: column; gap: var(--space-2); }
.nav-mobile a {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition-interactive);
}
.nav-mobile a:hover { background: var(--color-primary-muted); }

@media (max-width: 900px) {
  .nav-desktop { display: none; }
  .hamburger { display: flex; }
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: var(--space-16) var(--space-6);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg svg {
  width: 100%;
  height: 100%;
  opacity: 0.6;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary-muted);
  border-radius: var(--radius-full);
}

.hero-title {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  line-height: 1.05;
}

.hero-subtitle {
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
  letter-spacing: -0.01em;
}

.hero-description {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 600px;
  margin-inline: auto;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background var(--transition-interactive), transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.hero-cta:hover {
  background: var(--color-primary-hover);
  color: var(--color-text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-teal);
}

/* ============================================================
   SECTION SHARED
   ============================================================ */
.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}
.section--alt { background: var(--color-surface-2); }
.section-header {
  text-align: center;
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-16));
}
.section-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.section-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.section-subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 560px;
  margin-inline: auto;
}

/* ============================================================
   RESEARCH CARDS (Homepage)
   ============================================================ */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.research-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  transition: border-color 0.3s var(--ease-out),
              box-shadow 0.3s var(--ease-out),
              transform 0.3s var(--ease-out);
  cursor: default;
  overflow: hidden;
}
.research-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--color-primary-glow), var(--color-accent-glow));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.3s var(--ease-out);
}
.research-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow-teal);
  border-color: var(--color-primary);
}
.research-card:hover::before { opacity: 1; }

.research-card-icon {
  width: 56px; height: 56px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-muted);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--space-5);
  color: var(--color-primary);
}
.research-card-icon svg { width: 28px; height: 28px; }

.research-card h3 {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}
.research-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
}
.research-card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-5);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  transition: gap var(--transition-interactive);
}
.research-card-link:hover { gap: var(--space-3); }
.research-card-link svg { width: 16px; height: 16px; }

/* ============================================================
   NEWS GRID
   ============================================================ */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-5);
}

.news-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.news-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.news-date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.news-tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-muted);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}
.news-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}
.news-author {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ============================================================
   TEAM SECTION
   ============================================================ */
.pi-card {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-10);
}
@media (max-width: 640px) {
  .pi-card { flex-direction: column; text-align: center; }
}

.avatar-circle {
  width: 100px; height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary-muted), var(--color-accent-muted));
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-display);
}
.avatar-circle--sm {
  width: 64px; height: 64px;
  font-size: var(--text-lg);
}

.pi-info h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.pi-info .role {
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.pi-info p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-5);
}

.team-card {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive), transform var(--transition-interactive);
}
.team-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.team-card .avatar-circle--sm { margin-inline: auto; margin-bottom: var(--space-3); }
.team-card h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.team-card .team-role {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.team-section-label {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-divider);
}

.team-cta-wrapper {
  text-align: center;
  margin-top: var(--space-10);
}

/* ============================================================
   VIDEO / LAB TOUR
   ============================================================ */
.video-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  max-width: 800px;
  margin-inline: auto;
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: box-shadow var(--transition-interactive);
}
.video-card:hover {
  box-shadow: var(--shadow-lg);
}
.video-card-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-primary-muted), var(--color-accent-muted));
}
.video-play-btn {
  position: relative; z-index: 1;
  width: 72px; height: 72px;
  border-radius: 50%;
  background: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-inverse);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.video-card:hover .video-play-btn {
  transform: scale(1.1);
  box-shadow: var(--shadow-glow-teal);
}
.video-play-btn svg { width: 28px; height: 28px; margin-left: 3px; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  max-width: 900px;
  margin-inline: auto;
}
@media (max-width: 640px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-info { display: flex; flex-direction: column; gap: var(--space-6); }
.contact-item { display: flex; gap: var(--space-4); align-items: flex-start; }
.contact-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-primary-muted);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}
.contact-icon svg { width: 20px; height: 20px; }
.contact-item h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-1);
}
.contact-item p, .contact-item a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.map-placeholder {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: block;
}
.map-placeholder iframe {
  width: 100%;
  height: 320px;
  border: 0;
  display: block;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-10) var(--space-6);
  background: var(--color-surface-2);
}
.footer-inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-6);
}
.footer-nav { display: flex; flex-wrap: wrap; gap: var(--space-4); }
.footer-nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
.footer-nav a:hover { color: var(--color-text); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  max-width: var(--content-wide);
  margin-inline: auto;
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
}
.footer-bottom a { color: var(--color-text-faint); text-decoration: none; }
.footer-bottom a:hover { color: var(--color-primary); }

/* ============================================================
   RESEARCH PAGE (detail)
   ============================================================ */
.research-detail {
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
  border-bottom: 1px solid var(--color-divider);
}
.research-detail:last-of-type { border-bottom: none; }

.research-detail-inner {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.research-detail-icon {
  width: 72px; height: 72px;
  border-radius: var(--radius-xl);
  background: var(--color-primary-muted);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--space-6);
  color: var(--color-primary);
}
.research-detail-icon svg { width: 36px; height: 36px; }

.research-detail h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-5);
  color: var(--color-text);
}

/* data-research-desc markers for easy replacement */
.research-detail [data-research-desc] {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 72ch;
}

/* ============================================================
   PEOPLE PAGE
   ============================================================ */
.people-page-header {
  padding-block: clamp(var(--space-10), 5vw, var(--space-16));
  text-align: center;
  background: var(--color-surface-2);
}

.people-section {
  padding-block: var(--space-10);
}

/* Person card for people page (bigger) */
.person-card {
  text-align: center;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive), transform var(--transition-interactive);
}
.person-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}
.person-card .avatar-circle {
  margin-inline: auto;
  margin-bottom: var(--space-4);
}
.person-card h4 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-1);
}
.person-card .person-role {
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--space-2);
}
.person-card .person-detail {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-5);
}

/* Alumni collapsible */
.alumni-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-lg);
  font-weight: 700;
  font-family: var(--font-display);
  color: var(--color-text);
  padding: var(--space-4) 0;
  border: none;
  background: none;
  cursor: pointer;
  width: 100%;
  text-align: left;
}
.alumni-toggle svg {
  width: 20px; height: 20px;
  transition: transform 0.3s var(--ease-out);
  color: var(--color-text-muted);
}
.alumni-toggle.is-open svg { transform: rotate(180deg); }
.alumni-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease-out);
}
.alumni-content.is-open { max-height: 4000px; }

.alumni-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-2);
  padding-bottom: var(--space-6);
}
.alumni-list li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: background var(--transition-interactive);
}
.alumni-list li:hover { background: var(--color-primary-muted); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              transform var(--transition-interactive),
              box-shadow var(--transition-interactive);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-glow-teal);
}

.btn--outline {
  background: transparent;
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
}
.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-muted);
}

/* ============================================================
   ANIMATED HEX GRID (hero background)
   ============================================================ */
@keyframes hex-pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.8; }
}

.hex-grid-animated .hex-cell {
  animation: hex-pulse 4s ease-in-out infinite;
}
.hex-grid-animated .hex-cell:nth-child(3n) { animation-delay: 0.5s; }
.hex-grid-animated .hex-cell:nth-child(3n+1) { animation-delay: 1.2s; }
.hex-grid-animated .hex-cell:nth-child(3n+2) { animation-delay: 2s; }

/* ============================================================
   PAGE HERO (for inner pages)
   ============================================================ */
.page-hero {
  padding: clamp(var(--space-10), 5vw, var(--space-16)) var(--space-6);
  text-align: center;
  background: var(--color-surface-2);
  position: relative;
  overflow: hidden;
}
.page-hero h1 {
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}
.page-hero p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 560px;
  margin-inline: auto;
}

/* ============================================================
   RESEARCH AREA COLORS (accent variants)
   ============================================================ */
.research-card[data-area="devices"] .research-card-icon {
  background: var(--color-primary-muted);
  color: var(--color-primary);
}
.research-card[data-area="inse"] .research-card-icon {
  background: var(--color-accent-muted);
  color: var(--color-accent);
}
.research-card[data-area="biodevices"] .research-card-icon {
  background: var(--color-coral-muted);
  color: var(--color-coral);
}

/* 3-column research grid */
.research-grid--3col {
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 900px) {
  .research-grid--3col {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   RESEARCH ACCORDIONS (Kempa-style)
   ============================================================ */
.research-accordions {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-10) var(--space-6) var(--space-16);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* --- Accordion Item --- */
.accordion-item {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s var(--ease-out);
}
.accordion-item:hover {
  box-shadow: var(--shadow-md);
}

/* --- Accordion Banner (clickable header) --- */
.accordion-banner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-8) var(--space-8);
  min-height: 120px;
  border: none;
  cursor: pointer;
  position: relative;
  text-align: left;
  transition: filter 0.3s var(--ease-out);
}
.accordion-banner:hover {
  filter: brightness(1.05);
}

/* Gradient variants */
.accordion-banner--teal {
  background: linear-gradient(135deg, #5BBFB5 0%, #2D8B83 100%);
}
.accordion-banner--lavender {
  background: linear-gradient(135deg, #A8A4D7 0%, #6B5EA6 100%);
}
.accordion-banner--coral {
  background: linear-gradient(135deg, #E8826F 0%, #C45A4A 100%);
}

.accordion-banner-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}

/* +/- toggle icon */
.accordion-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  position: relative;
  margin-left: var(--space-4);
}
.accordion-icon::before,
.accordion-icon::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 2.5px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.4s var(--ease-out);
}
.accordion-icon::before {
  transform: translate(-50%, -50%);
}
.accordion-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

/* When expanded: rotate the vertical bar to form a minus */
.accordion-banner[aria-expanded="true"] .accordion-icon::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

/* --- Accordion Panel --- */
.accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease-out);
  background: var(--color-surface);
}

.accordion-panel-inner {
  padding: var(--space-8) var(--space-8) var(--space-10);
}

/* --- Research Subsection (2-col layout) --- */
.research-subsection {
  display: grid;
  grid-template-columns: 55% 1fr;
  gap: var(--space-8);
  align-items: start;
  padding-bottom: var(--space-8);
  margin-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-divider);
}
.research-subsection:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

@media (max-width: 768px) {
  .research-subsection {
    grid-template-columns: 1fr;
  }
  .accordion-banner {
    min-height: 88px;
    padding: var(--space-6);
  }
  .accordion-banner-title {
    font-size: var(--text-lg);
  }
  .accordion-panel-inner {
    padding: var(--space-6);
  }
}

.research-subsection-text h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.research-subsection-text p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

/* Key publications */
.research-pubs {
  margin-top: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-2);
  border-radius: var(--radius-lg);
  border-left: 3px solid var(--color-primary);
}
.research-pubs h4 {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-2);
}
.research-pubs ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.research-pubs li {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
  padding-left: var(--space-3);
  position: relative;
}
.research-pubs li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

/* --- Diagram iframes --- */
.research-subsection-diagram {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.research-diagram {
  width: 100%;
  height: 450px;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
}

.diagram-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 200px;
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  color: var(--color-text-faint);
  font-size: var(--text-sm);
  font-style: italic;
}

/* Accent color on pub border per section */
.accordion-banner--teal ~ .accordion-panel .research-pubs {
  border-left-color: #5BBFB5;
}
.accordion-banner--lavender ~ .accordion-panel .research-pubs {
  border-left-color: #A8A4D7;
}
.accordion-banner--coral ~ .accordion-panel .research-pubs {
  border-left-color: #E8826F;
}

/* ============================================================
   TEAM PHOTOS (people.html & index.html)
   ============================================================ */
.avatar-photo {
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}
.avatar-photo:hover {
  transform: scale(1.06);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.avatar-photo--pi {
  width: 180px;
  height: 180px;
}
.avatar-photo--member {
  width: 120px;
  height: 120px;
}
.avatar-photo--sm {
  width: 80px;
  height: 80px;
}

/* Homepage team grid photos */
.team-card .avatar-photo--sm {
  margin-inline: auto;
  margin-bottom: var(--space-3);
}

/* People page cards */
.person-card .avatar-photo--member {
  margin-inline: auto;
  margin-bottom: var(--space-4);
}