/* ═══════════════════════════════
   PaperHub — Research Repository
   ═══════════════════════════════ */

.ph-wrap {
  display: flex;
  flex-direction: column;
  gap: 0;
  height: calc(100vh - 4rem);
  min-height: 520px;
  overflow: hidden;
}

/* ── Header ── */
.ph-header {
  padding: 1rem 1.25rem 0.75rem;
  border-bottom: 1px solid #21262d;
  flex-shrink: 0;
  background: #0d1117;
}

.ph-header-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: #e6edf3;
}

.ph-header-sub {
  font-size: 0.73rem;
  color: #8b949e;
  margin-top: 0.2rem;
}

/* ── Filters ── */
.ph-filters {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 1.25rem;
  background: #161b22;
  border-bottom: 1px solid #21262d;
  flex-shrink: 0;
  flex-wrap: wrap;
}

.ph-search {
  flex: 1;
  min-width: 180px;
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: 6px;
  color: #e6edf3;
  font-size: 0.8rem;
  padding: 0.4rem 0.7rem;
  font-family: inherit;
  transition: border-color 0.15s;
}

.ph-search:focus { outline: none; border-color: #58a6ff; }
.ph-search::placeholder { color: #8b949e; }

.ph-select {
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: 6px;
  color: #c9d1d9;
  font-size: 0.78rem;
  padding: 0.38rem 0.6rem;
  cursor: pointer;
  font-family: inherit;
}

.ph-select:focus { outline: none; border-color: #58a6ff; }

.ph-oa-toggle {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  color: #8b949e;
  cursor: pointer;
  white-space: nowrap;
}

.ph-oa-toggle input { accent-color: #3fb950; cursor: pointer; }

.ph-tag-clear {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.73rem;
  background: rgba(88, 166, 255, 0.12);
  border: 1px solid rgba(88, 166, 255, 0.3);
  color: #58a6ff;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
}

.ph-tag-clear:hover { background: rgba(88, 166, 255, 0.2); }

/* ── Layout ── */
.ph-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  flex: 1;
  overflow: hidden;
}

/* ── Paper list ── */
.ph-list {
  border-right: 1px solid #21262d;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.ph-empty {
  text-align: center;
  color: #8b949e;
  font-size: 0.8rem;
  padding: 3rem 1rem;
}

/* ── Paper card ── */
.ph-card {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid #21262d;
  cursor: pointer;
  transition: background 0.1s;
  position: relative;
}

.ph-card:hover { background: rgba(255,255,255,0.03); }

.ph-card-active { background: #1f2a3a; }
.ph-card-active:hover { background: #1f2a3a; }

.ph-card-pinned { border-left: 2px solid #58a6ff; }

.ph-card-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.45rem;
}

.ph-type-badge {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
}

.ph-type-research {
  background: rgba(63, 185, 80, 0.15);
  color: #3fb950;
  border: 1px solid rgba(63, 185, 80, 0.3);
}

.ph-type-review {
  background: rgba(88, 166, 255, 0.12);
  color: #58a6ff;
  border: 1px solid rgba(88, 166, 255, 0.3);
}

.ph-oa-badge {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: rgba(227, 179, 65, 0.12);
  color: #e3b341;
  border: 1px solid rgba(227, 179, 65, 0.3);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
}

.ph-pin-badge {
  color: #58a6ff;
  display: flex;
  align-items: center;
}

.ph-card-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: #e6edf3;
  line-height: 1.4;
  margin: 0 0 0.3rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.ph-card-authors {
  font-size: 0.72rem;
  color: #8b949e;
  margin-bottom: 0.3rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ph-card-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.ph-journal {
  font-size: 0.72rem;
  color: #bc8cff;
  font-style: italic;
}

.ph-region-tag {
  font-size: 0.65rem;
  color: #8b949e;
  background: rgba(139, 148, 158, 0.1);
  padding: 0.05rem 0.3rem;
  border-radius: 3px;
}

.ph-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem;
  margin-bottom: 0.4rem;
}

.ph-tag {
  font-size: 0.62rem;
  color: #8b949e;
  background: rgba(139, 148, 158, 0.08);
  border: 1px solid rgba(139, 148, 158, 0.15);
  padding: 0.05rem 0.35rem;
  border-radius: 3px;
}

.ph-tag-lg {
  font-size: 0.72rem;
  padding: 0.15rem 0.5rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.ph-tag-lg:hover {
  background: rgba(88, 166, 255, 0.1);
  border-color: rgba(88, 166, 255, 0.3);
  color: #58a6ff;
}

.ph-card-stats {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.ph-stat {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.68rem;
  color: #8b949e;
}

.ph-save-btn {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  margin-left: auto;
  font-size: 0.68rem;
  background: transparent;
  border: 1px solid #30363d;
  color: #8b949e;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.ph-save-btn:hover { background: rgba(255,255,255,0.05); color: #e6edf3; }

.ph-saved {
  color: #e3b341;
  border-color: rgba(227, 179, 65, 0.35);
  background: rgba(227, 179, 65, 0.06);
}

/* ── Detail panel ── */
.ph-detail {
  overflow-y: auto;
  background: #161b22;
}

.ph-detail-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: #8b949e;
  font-size: 0.82rem;
}

.ph-detail-inner {
  padding: 1.5rem 1.75rem;
  max-width: 760px;
}

.ph-detail-top { margin-bottom: 1.25rem; }

.ph-detail-badges {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.ph-detail-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #e6edf3;
  line-height: 1.4;
  margin: 0 0 0.5rem;
}

.ph-detail-authors {
  font-size: 0.8rem;
  color: #8b949e;
  margin-bottom: 0.35rem;
}

.ph-detail-citation {
  font-size: 0.75rem;
  color: #8b949e;
  margin-bottom: 0.35rem;
}

.ph-doi {
  font-family: 'Cascadia Code', monospace;
  color: #58a6ff;
  font-size: 0.72rem;
}

.ph-detail-region {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.72rem;
  color: #f97316;
}

.ph-detail-abstract {
  margin-bottom: 1rem;
  padding: 1rem;
  background: rgba(0,0,0,0.2);
  border: 1px solid #21262d;
  border-radius: 8px;
}

.ph-detail-abstract p {
  font-size: 0.82rem;
  color: #c9d1d9;
  line-height: 1.7;
  margin: 0;
}

.ph-section-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #8b949e;
  margin-bottom: 0.5rem;
}

.ph-detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
}

.ph-detail-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.ph-stat-card {
  background: #0d1117;
  border: 1px solid #21262d;
  border-radius: 8px;
  padding: 0.75rem;
  text-align: center;
}

.ph-stat-val {
  font-size: 1.3rem;
  font-weight: 700;
  color: #e6edf3;
}

.ph-stat-lbl {
  font-size: 0.68rem;
  color: #8b949e;
  margin-top: 0.2rem;
}

.ph-detail-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.ph-action-btn {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-family: inherit;
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  background: transparent;
  border: 1px solid #30363d;
  color: #c9d1d9;
}

.ph-action-btn:hover { background: rgba(255,255,255,0.05); }

.ph-action-primary {
  background: #238636;
  border-color: #238636;
  color: #fff;
  font-weight: 600;
}

.ph-action-primary:hover { background: #2ea043; border-color: #2ea043; }

.ph-cite-box {
  background: #0d1117;
  border: 1px solid #21262d;
  border-radius: 8px;
  padding: 0.85rem 1rem;
  position: relative;
}

.ph-cite-text {
  display: block;
  font-family: 'Cascadia Code', 'Fira Code', monospace;
  font-size: 0.72rem;
  color: #c9d1d9;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: 0.5rem;
}

.ph-cite-text em { font-style: italic; }
.ph-cite-text strong { font-weight: 600; }

.ph-copy-cite {
  font-size: 0.72rem;
  background: #21262d;
  border: 1px solid #30363d;
  color: #c9d1d9;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  font-family: inherit;
}

.ph-copy-cite:hover { background: #30363d; }

/* ── Responsive ── */
@media (max-width: 800px) {
  .ph-layout { grid-template-columns: 1fr; }
  .ph-detail { display: none; }
  .ph-wrap { height: auto; }
}