/* ============================================
   TAIGA TSUKADA — Personal Site
   Design: Academic Refined / Deep Navy + Storm Red
   Bootstrap 4 removed — pure CSS Variables + Grid/Flexbox
   Fonts: Cormorant Garamond (display) + DM Sans (body)
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,600;0,700;1,300;1,400;1,600&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300;1,9..40,400&display=swap');

:root {
  --color-ink:       #1a1c20;
  --color-muted:     #5a5f6b;
  --color-subtle:    #9aa0ad;
  --color-border:    #e2e5ea;
  --color-bg:        #f5f6f8;
  --color-surface:   #ffffff;
  --color-accent:    #1d4e89;
  --color-accent2:   #c0392b;
  --color-hero-bg:   #0d1b2e;
  --font-display:  Georgia, 'Cormorant Garamond', serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
  --radius-sm:   4px;
  --radius-md:   10px;
  --radius-lg:   20px;
  --shadow-sm:   0 1px 3px rgba(0,0,0,.08);
  --shadow-md:   0 4px 16px rgba(0,0,0,.1);
  --shadow-lg:   0 12px 40px rgba(0,0,0,.15);
  --nav-height:  64px;
  --max-w:       1100px;
  --section-gap: 88px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  background: var(--color-hero-bg); /* Mac overscroll fix: top/bottom bounce shows dark navy */
}
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a  { color: var(--color-accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--color-accent2); text-decoration: underline; }

.container { max-width: var(--max-w); margin-inline: auto; padding-inline: 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; clip: rect(0,0,0,0); overflow: hidden; }

/* NAV */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(13,27,46,0.92);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  z-index: 1000;
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,.07);
  transition: background .3s;
  overflow: visible; /* モバイルメニューが親にクリッピングされないように */
}
.site-nav.scrolled { background: rgba(13,27,46,0.98); }

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: #fff;
  letter-spacing: .06em;
  text-transform: uppercase;
  flex-shrink: 0;
}
.nav-logo:hover { color: #fff; text-decoration: none; opacity: .85; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}
.nav-links a {
  color: rgba(255,255,255,.7);
  font-size: .78rem;
  font-weight: 400;
  letter-spacing: .09em;
  text-transform: uppercase;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  transition: color .2s, background .2s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 14px; right: 14px;
  height: 1px;
  background: var(--color-accent2);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}
.nav-links a:hover,
.nav-links a.active {
  color: #fff;
  background: rgba(255,255,255,.06);
  text-decoration: none;
}
.nav-links a.active::after { transform: scaleX(1); }
.nav-links .lang-switcher {
  margin-left: 18px;
  padding-left: 18px;
  border-left: 1px solid rgba(255,255,255,.18);
}
.nav-links .lang-switcher a { color: rgba(255,255,255,.5); font-size: .75rem; }
.nav-links .lang-switcher a:hover { color: #fff; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: white;
  border-radius: 999px;
  transition: transform .6s cubic-bezier(.34,1.56,.64,1),
              opacity .25s ease;
  transform-origin: center;
}
.nav-toggle[aria-expanded="true"] {
  transform: rotate(-360deg);
  transition: transform .6s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(135deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-135deg);
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    width: 100vw;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(10,20,38,0.98);
    padding: 12px 0 40px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    z-index: 999;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity .22s ease, visibility .22s ease, transform .22s ease;
  }
  .nav-links.open {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
  .nav-links li {
    width: 100%;
  }
  .nav-links a {
    display: block;
    width: 100%;
    padding: 18px 32px;
    border-radius: 0;
    font-size: .95rem;
    letter-spacing: .08em;
    border-bottom: 1px solid rgba(255,255,255,.06);
  }
  .nav-links a::after { display: none; }
  .nav-links .lang-switcher {
    margin: 12px 0 0;
    padding: 0;
    border-left: none;
    border-top: 1px solid rgba(255,255,255,.12);
  }
  .nav-links .lang-switcher a {
    padding: 18px 32px;
    font-size: .9rem;
    border-bottom: none;
  }
}



/* HERO */
.page-hero {
  margin-top: var(--nav-height);
  position: relative;
  background: var(--color-hero-bg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 480px;
}
.page-hero::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 60% 40%, rgba(29,78,137,.3) 0%, transparent 70%),
    radial-gradient(ellipse 50% 50% at 20% 80%, rgba(192,57,43,.18) 0%, transparent 60%);
  z-index: 1;
  pointer-events: none;
}

.hero-bg-slides { position: absolute; inset: 0; z-index: 0; }
.hero-bg-slides .slide {
  position: absolute; inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1.6s ease;
  will-change: opacity;
}
.hero-bg-slides .slide.active { opacity: 1; }

.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(13,27,46,.52) 0%, rgba(13,27,46,.48) 60%, rgba(13,27,46,.72) 100%);
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  color: #fff;
  padding: 80px 24px 72px;
}
.hero-content .hero-name {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 4rem);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: .01em;
  margin-bottom: 18px;
  text-shadow: 0 2px 24px rgba(0,0,0,.3);
}
.hero-content .hero-title {
  font-size: clamp(.85rem, 2vw, 1rem);
  font-weight: 400;
  color: rgba(255,255,255,.7);
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.hero-content .hero-affiliation {
  font-size: .95rem;
  color: rgba(255,255,255,.55);
  letter-spacing: .01em;
}
.hero-page-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 600;
  letter-spacing: .03em;
  text-shadow: 0 2px 20px rgba(0,0,0,.3);
}
.hero-content::after {
  content: '';
  display: block;
  width: 44px; height: 2px;
  background: var(--color-accent2);
  margin: 22px auto 0;
  opacity: .8;
}

.photo-credit {
  position: absolute;
  bottom: 14px; right: 18px;
  z-index: 4;
  font-size: .7rem;
  color: rgba(255,255,255,.32);
  letter-spacing: .05em;
}

/* REVEAL */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .65s cubic-bezier(.25,.46,.45,.94), transform .65s cubic-bezier(.25,.46,.45,.94);
}
.reveal.visible { opacity: 1; transform: none; }
.delay-1 { transition-delay: .12s; }
.delay-2 { transition-delay: .24s; }
.delay-3 { transition-delay: .36s; }

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp .7s cubic-bezier(.25,.46,.45,.94) both; }

/* SECTIONS */
.section { padding-block: var(--section-gap); }
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 10px;
  letter-spacing: .01em;
}
.section-rule {
  width: 40px; height: 3px;
  background: var(--color-accent2);
  border-radius: 2px;
  margin-bottom: 20px;
}

/* PROFILE */
.profile-section { background: var(--color-surface); }
.profile-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 64px;
  align-items: center;
}
@media (max-width: 800px) { .profile-grid { grid-template-columns: 1fr; gap: 40px; } }
.profile-photo {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
}
.contact-list { list-style: none; margin-bottom: 32px; }
.contact-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: .9rem;
  color: var(--color-muted);
}
.contact-list li:last-child { border-bottom: none; }
.contact-list .icon {
  color: var(--color-accent);
  font-size: .9rem;
  margin-top: 3px;
  flex-shrink: 0;
  width: 18px;
  text-align: center;
}
.affiliation-links { display: flex; flex-direction: column; gap: 8px; }
.affiliation-links a { font-size: .9rem; color: var(--color-accent); display: inline-flex; align-items: center; gap: 6px; }
.affiliation-links a::before { content: '→'; font-size: .8em; opacity: .6; }
.affiliation-links a:hover { color: var(--color-accent2); text-decoration: none; }

/* Academic profile badges (ORCID / GitHub / Google Scholar) */
.scholar-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.scholar-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 16px;
  border-radius: 100px;
  font-size: .82rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-ink);
  text-decoration: none;
  transition: border-color .2s, box-shadow .2s, color .2s, background .2s;
}
.scholar-link img { flex-shrink: 0; }
.scholar-link:hover { text-decoration: none; box-shadow: var(--shadow-sm); }
.orcid-link:hover  { border-color: #a6ce39; color: #5a8a00; background: #f6ffe0; }
.github-link:hover { border-color: #333; color: #333; background: #f5f5f5; }
.gscholar-link:hover { border-color: #4285f4; color: #4285f4; background: #f0f5ff; }

/* NAV CARDS */
.nav-cards-section { background: var(--color-bg); }
.nav-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 640px) { .nav-cards { grid-template-columns: 1fr; } }
.nav-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 40px 28px;
  text-align: center;
  color: var(--color-ink);
  transition: transform .28s cubic-bezier(.25,.46,.45,.94), box-shadow .28s, border-color .28s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}
.nav-card::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .28s ease;
}
.nav-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: rgba(29,78,137,.2); text-decoration: none; color: var(--color-ink); }
.nav-card:hover::before { transform: scaleX(1); }
.nav-card-icon {
  width: 60px; height: 60px;
  border-radius: 50%;
  background: rgba(29,78,137,.07);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  color: var(--color-accent);
  transition: background .28s, color .28s, transform .28s;
}
.nav-card:hover .nav-card-icon { background: var(--color-accent); color: #fff; transform: scale(1.08); }
.nav-card-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: .02em;
}

/* INTRO */
.intro-section {
  background: var(--color-hero-bg);
  color: rgba(255,255,255,.82);
  position: relative;
  overflow: hidden;
}
.intro-section::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 80% at 90% 50%, rgba(29,78,137,.25) 0%, transparent 70%);
  pointer-events: none;
}
.intro-section .section-title { color: #fff; }
.intro-section .section-rule { background: var(--color-accent2); }
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 64px;
  align-items: center;
  position: relative;
}
@media (max-width: 800px) { .intro-grid { grid-template-columns: 1fr; } }
.intro-points { list-style: none; display: flex; flex-direction: column; gap: 20px; margin-bottom: 36px; }
.intro-points li {
  padding-left: 18px;
  border-left: 2px solid rgba(192,57,43,.7);
  font-size: .95rem;
  line-height: 1.75;
  color: rgba(255,255,255,.75);
}
.intro-image { border-radius: var(--radius-md); box-shadow: 0 24px 64px rgba(0,0,0,.45); width: 100%; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  background: var(--color-accent2);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  transition: background .2s, transform .2s, box-shadow .2s;
  text-decoration: none;
}
.btn-primary:hover { background: #a93226; color: #fff; text-decoration: none; transform: translateX(4px); box-shadow: 0 4px 16px rgba(192,57,43,.35); }

/* HISTORY */
.history-section { background: var(--color-surface); }
.history-block { margin-bottom: 60px; }
.history-block:last-child { margin-bottom: 0; }
.history-block h3 {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  display: flex; align-items: center; gap: 12px;
}
.history-block h3::before {
  content: '';
  display: block;
  width: 4px; height: 1.2em;
  background: var(--color-accent2);
  border-radius: 2px;
  flex-shrink: 0;
}
.timeline { list-style: none; position: relative; padding-left: 24px; }
.timeline::before {
  content: '';
  position: absolute;
  left: 4px; top: 8px; bottom: 8px;
  width: 1px;
  background: var(--color-border);
}
.timeline li {
  position: relative;
  padding: 8px 0 8px 20px;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--color-muted);
}
.timeline li::before {
  content: '';
  position: absolute;
  left: -5px; top: 16px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 2px solid var(--color-accent);
  transition: background .2s;
}
.timeline li:hover::before { background: var(--color-accent); }
.timeline li strong, .timeline li .year { color: var(--color-ink); font-weight: 500; }
.award-item {
  display: flex; gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: flex-start;
}
.award-item:last-child { border-bottom: none; }
.award-year {
  font-size: .75rem; font-weight: 600;
  color: var(--color-accent2);
  letter-spacing: .06em;
  white-space: nowrap; margin-top: 3px;
  min-width: 56px; text-transform: uppercase;
}
.hobby-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
.hobby-card {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 22px;
  border: 1px solid var(--color-border);
  transition: border-color .2s, box-shadow .2s;
}
.hobby-card:hover { border-color: rgba(29,78,137,.25); box-shadow: var(--shadow-sm); }
.hobby-card h4 { font-size: .95rem; font-weight: 500; margin-bottom: 8px; color: var(--color-ink); }
.hobby-card p { color: var(--color-muted); font-size: .85rem; line-height: 1.6; }

/* WORKS */
.works-section { background: var(--color-surface); }
.works-block { margin-bottom: 60px; }
.works-block:last-child { margin-bottom: 0; }
.works-block h3 {
  font-family: var(--font-display);
  font-size: 1.45rem; font-weight: 600;
  margin-bottom: 24px; padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  display: flex; align-items: center; gap: 12px;
}
.works-block h3::before {
  content: '';
  display: block; width: 4px; height: 1.2em;
  background: var(--color-accent); border-radius: 2px; flex-shrink: 0;
}
.pub-list { list-style: none; display: flex; flex-direction: column; }
.pub-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: .88rem; line-height: 1.75;
  color: var(--color-muted);
}
.pub-item:last-child { border-bottom: none; }
.pub-item u { color: var(--color-ink); font-weight: 500; text-decoration: none; }
.pub-item i { color: var(--color-ink); }
.pub-badge {
  display: inline-block;
  font-size: .68rem; font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase;
  padding: 2px 9px;
  border-radius: 100px;
  background: rgba(29,78,137,.09);
  color: var(--color-accent);
  margin-right: 8px; vertical-align: middle;
  border: 1px solid rgba(29,78,137,.15);
}
.software-list { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; margin-top: 4px; }
.software-item {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 18px;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: .85rem; color: var(--color-ink);
  background: var(--color-surface);
  transition: border-color .2s, box-shadow .2s, color .2s;
  text-decoration: none;
}
.software-item:hover { border-color: var(--color-accent); box-shadow: var(--shadow-sm); text-decoration: none; color: var(--color-accent); }
.software-item .lang-tag { font-size: .7rem; color: var(--color-subtle); padding: 1px 6px; background: var(--color-bg); border-radius: 4px; }

/* RESEARCH */
.research-section { background: var(--color-bg); }

/* FOOTER */
.site-footer {
  background: var(--color-hero-bg);
  color: rgba(255,255,255,.4);
  padding-block: 48px;
  text-align: center;
  font-size: .78rem; letter-spacing: .05em;
  border-top: 1px solid rgba(255,255,255,.06);
}
.site-footer a { color: rgba(255,255,255,.5); transition: color .2s; }
.site-footer a:hover { color: #fff; text-decoration: none; }
.site-footer .footer-links {
  display: flex; justify-content: center;
  gap: 28px; list-style: none;
  margin-bottom: 20px; flex-wrap: wrap;
}

/* ── Research Cards ──────────────────────── */
.research-section { background: var(--color-bg); }

.research-intro {
  max-width: 680px;
  margin-bottom: 56px;
}
.research-intro p {
  font-size: .95rem;
  color: var(--color-muted);
  line-height: 1.8;
}

.research-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.research-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform .28s cubic-bezier(.25,.46,.45,.94), box-shadow .28s, border-color .28s;
  text-decoration: none;
  color: inherit;
}
.research-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(29,78,137,.2);
  text-decoration: none;
  color: inherit;
}

/* Figure area */
.research-card-fig {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--color-hero-bg);
  overflow: hidden;
  flex-shrink: 0;
}
.research-card-fig img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  transition: transform .5s ease;
}
.research-card:hover .research-card-fig img {
  transform: scale(1.04);
}
/* Placeholder when no image */
.research-card-fig.no-img {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-hero-bg) 0%, #1a3556 100%);
}
.research-card-fig.no-img::after {
  content: attr(data-initials);
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 300;
  color: rgba(255,255,255,.18);
  letter-spacing: .1em;
}

/* Year badge overlaid on figure */
.research-card-year {
  position: absolute;
  top: 12px; left: 12px;
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(13,27,46,.75);
  backdrop-filter: blur(6px);
  color: rgba(255,255,255,.85);
  border: 1px solid rgba(255,255,255,.12);
}

/* Journal badge */
.research-card-journal {
  position: absolute;
  bottom: 12px; right: 12px;
  font-size: .65rem;
  font-weight: 500;
  letter-spacing: .05em;
  padding: 3px 9px;
  border-radius: 100px;
  background: rgba(29,78,137,.85);
  backdrop-filter: blur(6px);
  color: rgba(255,255,255,.9);
  max-width: calc(100% - 24px);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Card body */
.research-card-body {
  padding: 22px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.research-card-title {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--color-ink);
  letter-spacing: .01em;
}

.research-card-authors {
  font-size: .78rem;
  color: var(--color-muted);
  line-height: 1.5;
}
.research-card-authors u {
  color: var(--color-ink);
  font-weight: 500;
  text-decoration: none;
}

.research-card-citation {
  font-size: .78rem;
  color: var(--color-subtle);
  font-style: italic;
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px solid var(--color-border);
}

.research-card-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  padding-top: 4px;
}
.research-card-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--color-accent);
  padding: 4px 10px;
  border: 1px solid rgba(29,78,137,.25);
  border-radius: 100px;
  transition: background .2s, color .2s, border-color .2s;
  text-decoration: none;
}
.research-card-link:hover {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
  text-decoration: none;
}
.research-card-link.pdf-link {
  color: var(--color-accent2);
  border-color: rgba(192,57,43,.25);
}
.research-card-link.pdf-link:hover {
  background: var(--color-accent2);
  color: #fff;
  border-color: var(--color-accent2);
}

/* "Figure placeholder" note */
.fig-note {
  font-size: .72rem;
  color: rgba(255,255,255,.35);
  text-align: center;
  padding: 8px;
  font-style: italic;
}

/* First-author highlight ring */
.research-card.first-author {
  border-color: rgba(29,78,137,.2);
}
.research-card.first-author .research-card-fig::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid var(--color-accent2);
  z-index: 1;
  pointer-events: none;
  opacity: .5;
}

@media (max-width: 680px) {
  .research-cards {
    grid-template-columns: 1fr;
  }
}