/* ─── Feed Page Styles ─────────────────────────────────────────────────────── */

.nav-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--accent);
  color: var(--bg-primary);
  border: none;
  border-radius: 8px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: -0.01em;
}

.btn-primary:hover {
  background: #00ffb8;
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Feed Header */
.feed-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 40px 0 32px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.feed-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 6px;
}

.feed-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 300;
}

.feed-stats-bar {
  display: flex;
  gap: 24px;
}

.mini-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 70px;
}

.mini-stat-value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
}

.mini-stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Filters */
.filters-bar {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.filter-group label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

.filter-group select {
  appearance: none;
  padding: 8px 32px 8px 12px;
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.2s;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%237a8ba8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}

.filter-group select:hover {
  border-color: var(--accent-mid);
}

.filter-group select:focus {
  outline: none;
  border-color: var(--accent);
}

/* Paper Cards */
.papers-container {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-height: 200px;
}

.paper-card {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.2s, transform 0.15s;
}

.paper-card:hover {
  border-color: var(--accent-mid);
  transform: translateY(-1px);
}

.paper-rank {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 24px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  border-right: 1px solid var(--border);
  background: var(--bg-secondary);
}

.paper-content {
  padding: 20px 24px;
}

.paper-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}

.paper-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.source-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.source-badge.biorxiv {
  background: rgba(74, 144, 226, 0.15);
  color: #4a90e2;
}

.source-badge.medrxiv {
  background: rgba(226, 135, 74, 0.15);
  color: #e2874a;
}

.paper-date {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.paper-category {
  font-size: 0.72rem;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  padding: 2px 8px;
  border-radius: 4px;
}

/* Score Badge */
.score-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 48px;
  padding: 6px 10px;
  border-radius: 8px;
  flex-shrink: 0;
}

.score-badge.score-high {
  background: rgba(0, 229, 160, 0.12);
  border: 1px solid rgba(0, 229, 160, 0.3);
}

.score-badge.score-mid {
  background: rgba(255, 193, 7, 0.10);
  border: 1px solid rgba(255, 193, 7, 0.25);
}

.score-badge.score-low {
  background: rgba(120, 140, 170, 0.08);
  border: 1px solid rgba(120, 140, 170, 0.2);
}

.score-value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1;
}

.score-high .score-value { color: var(--accent); }
.score-mid .score-value { color: #ffc107; }
.score-low .score-value { color: var(--text-muted); }

.score-label {
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Paper Text */
.paper-title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.paper-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.2s;
}

.paper-title a:hover {
  color: var(--accent);
}

.paper-authors {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
  line-height: 1.5;
  font-weight: 300;
}

.paper-institution {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  font-style: italic;
}

/* AI Summary */
.ai-summary {
  background: linear-gradient(135deg, rgba(0, 229, 160, 0.06), rgba(0, 229, 160, 0.02));
  border: 1px solid rgba(0, 229, 160, 0.15);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 12px 0;
}

.ai-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.ai-summary p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.65;
  font-weight: 300;
}

/* Signal Tags */
.signal-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.signal-tag {
  font-size: 0.68rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 0.02em;
}

.tag-new_target {
  background: rgba(236, 72, 153, 0.12);
  color: #ec4899;
  border: 1px solid rgba(236, 72, 153, 0.25);
}

.tag-novel_mechanism {
  background: rgba(139, 92, 246, 0.12);
  color: #8b5cf6;
  border: 1px solid rgba(139, 92, 246, 0.25);
}

.tag-first_in_class {
  background: rgba(245, 158, 11, 0.12);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.tag-clinical {
  background: rgba(6, 182, 212, 0.12);
  color: #06b6d4;
  border: 1px solid rgba(6, 182, 212, 0.25);
}

.tag-platform {
  background: rgba(59, 130, 246, 0.12);
  color: #3b82f6;
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.tag-commercial {
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.tag-prestige {
  background: rgba(249, 115, 22, 0.12);
  color: #f97316;
  border: 1px solid rgba(249, 115, 22, 0.25);
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0 40px;
}

.pagination-info {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.pagination-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-btn {
  padding: 8px 16px;
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.2s;
}

.page-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.page-indicator {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* States */
.loading-state, .empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  text-align: center;
}

.empty-state h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.empty-state p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 400px;
  font-weight: 300;
}

.empty-icon {
  margin-bottom: 20px;
  opacity: 0.6;
}

.loading-state p {
  color: var(--text-secondary);
  margin-top: 16px;
  font-size: 0.9rem;
}

/* Spinner */
.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 12px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--text-primary);
  z-index: 1000;
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.3s ease;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-success {
  border-color: rgba(0, 229, 160, 0.4);
}

.toast-error {
  border-color: rgba(239, 68, 68, 0.4);
  color: #ef4444;
}

/* CTA on landing */
.hero-cta {
  display: flex;
  gap: 12px;
  margin-top: 32px;
  align-items: center;
}

/* Mobile */
@media (max-width: 768px) {
  .feed-header {
    flex-direction: column;
    gap: 20px;
    align-items: flex-start;
  }

  .filters-bar {
    flex-direction: column;
  }

  .paper-card {
    grid-template-columns: 1fr;
  }

  .paper-rank {
    display: none;
  }

  .paper-header {
    flex-direction: column;
    gap: 8px;
  }

  .score-badge {
    flex-direction: row;
    gap: 6px;
    padding: 4px 10px;
  }

  .feed-stats-bar {
    gap: 16px;
  }

  .pagination {
    flex-direction: column;
    gap: 12px;
  }

  .nav-actions {
    display: none;
  }
}