body { display: flex; flex-direction: column; min-height: 100vh; }
main { flex: 1; padding-top: calc(var(--nav-h) + 56px); padding-bottom: 40px; }

/* ── ページヘッダー ── */
.page-header { margin-bottom: 40px; }
.page-header-inner { display: flex; flex-direction: column; gap: 20px; }
.page-eyebrow { display: flex; align-items: center; gap: 14px; }
.page-eyebrow-line { width: 32px; height: 1px; background: var(--accent-blue); opacity: 0.6; }
.page-eyebrow-text { font-family: var(--font-mono); font-size: 0.60rem; color: var(--accent-teal); letter-spacing: 0.28em; text-transform: uppercase; }
.page-desc { font-size: 0.88rem; color: var(--text-1); line-height: 1.85; max-width: 560px; }

/* ── フィルターバー(projects.cssと同系統) ── */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  padding: 8px 15px;
  border-radius: 99px;
  border: 1px solid var(--border-m);
  background: transparent;
  color: var(--text-1);
  transition: border-color var(--t), color var(--t), background var(--t);
}

.filter-btn-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.6;
}

.filter-btn:hover { color: var(--text-0); border-color: var(--border-hover); }
.filter-btn.active { color: var(--accent-blue); border-color: var(--accent-blue); background: rgba(75,169,255,0.08); }

.result-info { margin-bottom: 18px; }
.result-count { font-family: var(--font-mono); font-size: var(--fs-2xs); color: var(--text-2); letter-spacing: var(--ls-normal); }

/* ── ローディング / 空状態 ── */
.loading-state {
  display: flex; align-items: center; justify-content: center;
  gap: 10px; padding: 80px 0;
  font-family: var(--font-mono); font-size: 0.70rem;
  color: var(--text-2); letter-spacing: 0.14em;
}
.loading-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent-blue); animation: rsLoadingPulse 1.2s ease-in-out infinite; }
.loading-dot:nth-child(2){ animation-delay: 0.2s; }
.loading-dot:nth-child(3){ animation-delay: 0.4s; }
@keyframes rsLoadingPulse { 0%,80%,100%{ transform:scale(0.5); opacity:0.3; } 40%{ transform:scale(1.0); opacity:1.0; } }

.empty-state { display: flex; flex-direction: column; align-items: center; gap: 16px; padding: 72px 32px; text-align: center; }
.empty-icon { width: 52px; height: 52px; color: var(--text-2); opacity: 0.4; }
.empty-title { font-family: var(--font-display); font-size: 1.05rem; font-weight: 700; color: var(--text-1); }
.empty-desc { font-size: 0.78rem; color: var(--text-2); line-height: 1.75; max-width: 320px; }

/* ── Researchカード ── */
.research-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.research-card {
  padding: 24px 26px;
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: border-color var(--t), background var(--t);
}

.research-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.research-card-top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-bottom: 12px;
}

.research-cat-badge {
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--rc-color, var(--accent-purple));
  border: 1px solid var(--rc-color, var(--accent-purple));
  border-radius: 99px;
  padding: 3px 11px;
  opacity: 0.9;
}

.research-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  color: var(--text-2);
  letter-spacing: var(--ls-normal);
  text-transform: uppercase;
}

.research-status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.research-status[data-status="ongoing"]   { color: var(--accent-blue); }
.research-status[data-status="completed"] { color: var(--accent-teal); }
.research-status[data-status="idea"]      { color: var(--text-2); }
.research-status[data-status="paused"]    { color: var(--accent-amber); }

.research-updated {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  color: var(--text-2);
}

.research-card-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-lg);
  margin-bottom: 8px;
}

.research-card-summary {
  color: var(--text-1);
  font-size: var(--fs-sm);
  line-height: 1.8;
  margin-bottom: 14px;
  max-width: 720px;
}

.research-card-footer {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.research-tag {
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  color: var(--text-2);
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 99px;
}

.research-related {
  margin-left: auto;
  display: flex;
  gap: 8px;
}

.research-related a {
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  color: var(--accent-blue);
  letter-spacing: var(--ls-normal);
}

/* ── 戻るリンク ── */
.back-to-lab {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 0.62rem;
  color: var(--text-2); letter-spacing: 0.14em;
  text-transform: uppercase; text-decoration: none;
  transition: color var(--t); margin-top: 56px;
}
.back-to-lab:hover { color: var(--accent-blue); }
.back-to-lab svg { width: 14px; height: 14px; transform: rotate(180deg); }

@media (max-width: 640px) {
  .research-related { margin-left: 0; }
  .research-updated { margin-left: 0; }
}

/* ── ハッシュ経由の直リンク先を一時的にハイライト ── */
@keyframes highlightFlash {
  0%, 100% { box-shadow: none; }
  25%, 75% { box-shadow: 0 0 0 2px var(--accent-blue); }
}
.highlight-flash {
  animation: highlightFlash 2s ease-in-out;
  border-radius: var(--r-lg, 14px);
}