/* ════════════════════════════════════════════════════════════════
   ACADEMIC RESEARCH REPOSITORY STYLES (research.html)
════════════════════════════════════════════════════════════════ */

header {
  background: var(--midnight);
  color: var(--ivory);
  padding: 4rem 1.5rem 3rem;
  text-align: center;
  border-bottom: 1px solid rgba(253, 248, 246, 0.1);
}

.nav-back {
  display: inline-block;
  margin-bottom: 1.5rem;
  color: var(--teal-lt);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-back:hover {
  text-decoration: underline;
}

h1 {
  font-family: var(--display);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 400;
  margin-bottom: 0.5rem;
}

h1 span {
  background: linear-gradient(90deg, var(--teal-lt), var(--pink-lt));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sub {
  color: rgba(253, 248, 246, 0.7);
  max-width: 720px;
  margin: 0 auto 1.5rem;
  font-size: 1.1rem;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.paper-card {
  background: #fff;
  border-radius: 16px;
  padding: 2rem;
  border: 1px solid var(--rule);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.02);
  transition: transform 0.25s, box-shadow 0.25s;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.paper-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.06);
}

.tag-badge {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  display: inline-block;
  margin-bottom: 0.75rem;
}

.tag-teal {
  background: rgba(31, 184, 184, 0.12);
  color: var(--teal-deep);
}

.tag-pink {
  background: rgba(239, 107, 156, 0.12);
  color: var(--pink-deep);
}

.tag-violet {
  background: rgba(155, 127, 212, 0.12);
  color: var(--violet);
}

.paper-title {
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.paper-desc {
  font-size: 0.95rem;
  color: var(--slate);
  margin-bottom: 1.25rem;
}

.paper-meta {
  font-size: 0.85rem;
  color: var(--mist);
  margin-bottom: 1.25rem;
  border-top: 1px solid var(--rule);
  padding-top: 0.75rem;
}

.paper-link {
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--teal-deep);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.paper-link:hover {
  text-decoration: underline;
}

footer {
  background: var(--midnight);
  color: var(--mist);
  padding: 3rem 1.5rem;
  text-align: center;
  font-size: 0.9rem;
  margin-top: 4rem;
}

footer a {
  color: var(--teal-lt);
  text-decoration: none;
}