/*
 * components.css — UI widgets: buttons, inputs, badges, overlays, panels
 * Depends on: tokens.css
 */

/* ── Search input ── */
#searchInput {
  flex: 1;
  padding: 9px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: var(--bg-card);
  color: var(--text-1);
  transition: border-color 0.2s, box-shadow 0.2s;
  min-width: 0;
}
#searchInput:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
#searchInput::placeholder { color: var(--text-3); }

/* ── Buttons ── */
.btn {
  padding: 9px 18px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
  white-space: nowrap;
}
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn:not(:disabled):hover  { transform: translateY(-1px); }
.btn:not(:disabled):active { transform: translateY(0); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  box-shadow: 0 3px 12px var(--accent-glow);
}
.btn-secondary {
  background: var(--bg-card);
  color: var(--text-2);
  border: 1.5px solid var(--border);
}
.btn-icon {
  background: var(--bg-card);
  color: var(--text-2);
  border: 1.5px solid var(--border);
  padding: 9px 12px;
  font-size: 15px;
}

/* ── History pills ── */
.history-label {
  font-size: 11px;
  color: var(--text-3);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.history-pills {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  flex: 1;
}
.history-pill {
  padding: 3px 10px;
  background: var(--accent-glow);
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 99px;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s;
}
.history-pill:hover { background: var(--accent); color: #fff; }

/* ── Graph placeholder ── */
#graphPlaceholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-3);
  pointer-events: none;
}
#graphPlaceholder .ph-icon { font-size: 3rem; }
#graphPlaceholder .ph-text { font-size: 1rem; font-weight: 500; }
#graphPlaceholder .ph-hint { font-size: 0.82rem; }

/* ── Loading / error overlay ── */
#graphOverlay {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: color-mix(in srgb, var(--bg-graph) 80%, transparent);
  backdrop-filter: blur(4px);
  z-index: 10;
}
#graphOverlay.visible { display: flex; }

.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

#overlayText { color: var(--text-2); font-size: 14px; font-weight: 500; }
.error-icon  { font-size: 2.5rem; }
#overlayErrorMsg {
  color: var(--text-2);
  font-size: 13px;
  text-align: center;
  max-width: 340px;
}
.retry-btn {
  padding: 8px 18px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
}

/* ── Zoom buttons ── */
#zoomControls {
  position: absolute;
  bottom: 18px;
  left: 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  z-index: 20;
}
.zoom-btn {
  width: 34px; height: 34px;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-2);
  box-shadow: var(--shadow-sm);
  transition: background 0.15s;
}
.zoom-btn:hover { background: var(--accent-glow); color: var(--accent); }

/* ── Tooltip ── */
#tooltip {
  position: fixed;
  pointer-events: none;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  max-width: 280px;
  box-shadow: var(--shadow-md);
  font-size: 12.5px;
  line-height: 1.5;
  z-index: 9999;
  display: none;
}
#tooltip.visible { display: block; }
.tt-title { font-weight: 700; color: var(--text-1); margin-bottom: 4px; }
.tt-meta  { color: var(--text-2); }
.tt-cite  { color: var(--accent); font-weight: 600; margin-top: 4px; }
.tt-hint  { color: var(--text-3); font-style: italic; margin-top: 4px; font-size: 11px; }

/* ── Paper info panel ── */
#paperInfoTitle {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-1);
  line-height: 1.45;
  margin-bottom: 6px;
}
#paperInfoMeta {
  font-size: 12px;
  color: var(--text-2);
  margin-bottom: 8px;
  line-height: 1.5;
}
#paperInfoAbstract {
  font-size: 11.5px;
  color: var(--text-2);
  line-height: 1.6;
  max-height: 130px;
  overflow-y: auto;
  margin-bottom: 8px;
}
#paperInfoAbstract::-webkit-scrollbar       { width: 4px; }
#paperInfoAbstract::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.paper-info-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* Paper info action buttons */
.pi-btn {
  padding: 5px 12px;
  font-size: 11.5px;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  border: 1.5px solid var(--accent);
  color: var(--accent);
  background: transparent;
  transition: background 0.15s, color 0.15s;
  text-decoration: none;
  display: inline-block;
}
.pi-btn:hover                    { background: var(--accent); color: #fff; }
.pi-btn.expand-btn               { border-color: var(--accent-dark); color: var(--accent-dark); }
.pi-btn.expand-btn:hover         { background: var(--accent-dark); color: #fff; }

/* ── Type badges ── */
.pi-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 700;
  margin-right: 4px;
}
.badge-root      { background: color-mix(in srgb, var(--node-root) 15%, transparent);      color: var(--node-root); }
.badge-reference { background: color-mix(in srgb, var(--node-reference) 15%, transparent); color: var(--node-reference); }
.badge-citation  { background: color-mix(in srgb, var(--node-citation) 15%, transparent);  color: var(--node-citation); }
.badge-expanded  { background: color-mix(in srgb, var(--node-expanded) 15%, transparent);  color: var(--node-expanded); }

/* ── Placeholders / empty state ── */
.ph-sidebar { color: var(--text-3); font-size: 13px; font-style: italic; }

/* ── Legend ── */
.legend-grid     { display: flex; flex-direction: column; gap: 6px; }
.legend-row      { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--text-2); }
.legend-dot      {
  width: 16px; height: 16px;
  border-radius: 50%;
  flex-shrink: 0;
  border: var(--node-stroke-w) solid var(--node-stroke);
  filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.35));
}
.legend-line     { width: 28px; height: 2.5px; flex-shrink: 0; border-radius: 2px; background: var(--link-color); }
.legend-size-note { font-size: 11px; color: var(--text-3); margin-top: 8px; font-style: italic; }

/* Legend dot fills — theme-aware */
.dot-root      { background: var(--node-root); }
.dot-reference { background: var(--node-reference); }
.dot-citation  { background: var(--node-citation); }
.dot-expanded  { background: var(--node-expanded); }
.dot-selected  { background: var(--node-selected); }

/* ── Stats ── */
.stats-grid  { display: flex; gap: 16px; }
.stat-item   { display: flex; flex-direction: column; gap: 2px; }
.stat-val    { font-size: 1.3rem; font-weight: 700; color: var(--text-1); }
.stat-label  { font-size: 11px; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.04em; }

/* ── Papers list ── */
#papersListContainer {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 400px;
  overflow-y: auto;
}
#papersListContainer::-webkit-scrollbar       { width: 4px; }
#papersListContainer::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.paper-list-item {
  padding: 9px 11px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s;
  border-left: 3px solid transparent;
}
.paper-list-item:hover    { background: var(--accent-glow); }
.paper-list-item.selected { background: var(--accent-glow); border-left-color: var(--accent); }

.pli-title { font-size: 12px; font-weight: 600; color: var(--text-1); line-height: 1.35; }
.pli-meta  { font-size: 11px; color: var(--text-3); margin-top: 2px; }