/* Section : research */
:root {
  --muted: #8a909c;
  --dim:   #c8ccd8;
}

.research-page {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  padding: 6vh 8vw 12vh;
  display: flex;
  flex-direction: column;
  background: var(--panel);
}
.research-page .section-name { color: var(--bg); }
.research-page a.back-btn:hover { color: var(--bg); }

/* Header : title + back + tags */
.research-header {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 3rem;
}
.research-header .back-btn { font-size: 11px; }

.research-tags-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex: 1;
}

.research-tag {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: 1px solid var(--dim);
  padding: 0.35rem 0.9rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.research-tag:hover,
.research-tag.active {
  color: var(--bg);
  border-color: var(--bg);
}

/* Two-column grid */
.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

a.research-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: transparent;
  text-decoration: none;
  color: inherit;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.6rem 0;
  transition: background 0.2s;
}
a.research-card:nth-child(odd)  { border-right: 1px solid rgba(255, 255, 255, 0.1); padding-right: 2.5rem; }
a.research-card:nth-child(even) { padding-left: 2.5rem; }
a.research-card:hover { background: rgba(255, 255, 255, 0.05); }

.research-card-img {
  width: 72px;
  flex-shrink: 0;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: var(--dim);
}
.research-card-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s;
}
a.research-card:hover .research-card-img img { transform: scale(1.04); }

.research-card-body { flex: 1; min-width: 0; }

.research-card-meta {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: 0.45rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.research-card-type {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.1rem 0.45rem;
  color: var(--muted);
}
.research-card-ext { font-size: 13px; }

.research-card-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  line-height: 1.35;
  margin-bottom: 0.4rem;
  color: var(--dim);
}

.research-card-summary {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.research-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}
.research-card-tag {
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
}
.research-card-tag::before { content: '#'; }

/* Responsive */
@media (max-width: 860px) {
  .research-page { padding: 5vh 5vw 10vh; }
  .research-grid { grid-template-columns: 1fr; }
  a.research-card:nth-child(odd)  { border-right: none; padding-right: 0; }
  a.research-card:nth-child(even) { padding-left: 0; }
}