/* ============================================================
   PROMPT LIBRARY — app-shell version
   Category rail + searchable grid + lazy-loaded prompt bodies.
   ============================================================ */

:root {
  --bg-page: var(--bg);
  --accent-2-ring: rgba(234, 88, 12, 0.16);
}
html[data-theme="dark"] {
  --bg-page: #0F0F0E;
  --accent-2-ring: rgba(251, 146, 60, 0.20);
}

.lib-layout {
  display: grid;
  grid-template-columns: 236px 1fr;
  gap: var(--space-6);
  align-items: start;
}

/* ---------- CATEGORY RAIL ---------- */
.lib-rail {
  position: sticky;
  top: calc(var(--topbar-h) + var(--space-4));
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  max-height: calc(100vh - var(--topbar-h) - var(--space-8));
  overflow-y: auto;
}
.lib-rail-head {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
  padding: var(--space-2) var(--space-3) var(--space-3);
}
.lib-rail-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.lib-rail-item:hover { background: var(--bg-soft); color: var(--text); }
.lib-rail-item.active {
  background: var(--accent);
  color: var(--accent-fg);
  font-weight: 600;
}
.lib-rail-icon { font-size: 0.9375rem; line-height: 1; flex-shrink: 0; }
.lib-rail-label { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lib-rail-count {
  font-size: 0.6875rem;
  font-weight: 600;
  opacity: 0.62;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}
.lib-rail-item.active .lib-rail-count { opacity: 0.85; }

/* ---------- TOOLBAR ---------- */
.lib-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}
.lib-search {
  position: relative;
  flex: 1;
  min-width: 220px;
}
.lib-search svg {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  width: 15px;
  height: 15px;
  color: var(--muted);
  pointer-events: none;
}
.lib-search input {
  width: 100%;
  padding: var(--space-3) var(--space-3) var(--space-3) 34px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  color: var(--text);
  font-family: inherit;
  font-size: 0.875rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.lib-search input:focus {
  outline: none;
  border-color: var(--accent-2);
  box-shadow: 0 0 0 3px var(--accent-2-ring);
}
.lib-count {
  font-size: 0.8125rem;
  color: var(--muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.lib-clear {
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--muted);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  display: none;
}
.lib-clear:hover { color: var(--text); border-color: var(--border-strong); }
.lib-clear.on { display: inline-flex; align-items: center; gap: 4px; }

/* ---------- GRID ---------- */
.lib-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--space-3);
}
.lib-pcard {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  color: inherit;
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}
.lib-pcard:hover {
  border-color: var(--accent-2);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.lib-pcard:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 2px;
}
.lib-pcard-top {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
}
.lib-pcard-cat {
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--accent-2);
}
.lib-pcard-mode {
  margin-left: auto;
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted-light);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 7px;
}
.lib-pcard-name {
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.lib-pcard-foot {
  margin-top: auto;
  padding-top: var(--space-3);
  font-size: 0.75rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}
.lib-pcard-use { color: var(--accent-2); font-weight: 600; }

/* ---------- SKELETON / EMPTY ---------- */
.lib-skel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  min-height: 118px;
}
.lib-skel-bar {
  height: 9px;
  border-radius: 4px;
  background: var(--bg-soft);
  margin-bottom: var(--space-2);
  animation: libPulse 1.3s ease-in-out infinite;
}
.lib-skel-bar.w60 { width: 60%; }
.lib-skel-bar.w80 { width: 80%; }
.lib-skel-bar.w40 { width: 40%; }
@keyframes libPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}
.lib-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-12) var(--space-4);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
}
.lib-empty h3 { margin-bottom: var(--space-2); font-size: 1rem; }
.lib-empty p { color: var(--muted); font-size: 0.875rem; }

/* ---------- DRAWER ---------- */
.lib-drawer-scrim {
  position: fixed;
  inset: 0;
  background: rgba(12, 12, 11, 0.5);
  backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
  z-index: var(--z-scrim, 1100);
}
.lib-drawer-scrim.open { opacity: 1; pointer-events: auto; }
.lib-drawer {
  position: fixed;
  /* The drawer used top:0, which put its title row underneath the sticky
     topbar (drawer z-index 91 < topbar 800 on production). The title and the
     close button were unreachable. Start the drawer below the bar instead. */
  top: var(--topbar-h, 56px);
  right: 0;
  bottom: 0;
  width: min(560px, 94vw);
  background: var(--bg-page);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  transform: translateX(102%);
  transition: transform var(--transition-base);
  z-index: var(--z-overlay, 1110);
  display: flex;
  flex-direction: column;
}
.lib-drawer.open { transform: translateX(0); }
.lib-drawer-head {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-5) var(--space-4);
  border-bottom: 1px solid var(--border);
}
.lib-drawer-head h2 {
  font-size: 1.0625rem;
  line-height: 1.35;
  margin: 0 0 var(--space-1);
}
.lib-drawer-meta {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--accent-2);
}
.lib-drawer-close {
  margin-left: auto;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.lib-drawer-close:hover { color: var(--text); border-color: var(--border-strong); }
.lib-drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-5);
}
.lib-drawer-body pre {
  font-family: 'SF Mono', ui-monospace, 'Cascadia Code', Menlo, Consolas, monospace;
  font-size: 0.8125rem;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text-secondary);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
  margin: 0;
}
.lib-drawer-foot {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 1000px) {
  .lib-layout { grid-template-columns: 1fr; }
  .lib-rail {
    position: static;
    max-height: none;
    display: flex;
    flex-wrap: nowrap;
    gap: var(--space-1);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: var(--space-2);
    /* bleed the strip to the screen edges so the horizontal scroll reads as
       a swipeable carousel rather than a clipped column */
    margin-inline: calc(var(--space-4) * -1);
    padding-inline: var(--space-4);
  }
  .lib-rail::-webkit-scrollbar { display: none; }
  .lib-rail-head { width: auto; flex-shrink: 0; }
  .lib-rail-item { width: auto; flex-shrink: 0; }
  .lib-rail-label { max-width: 150px; }

  /* the item list is a nested flex container — it must scroll horizontally
     too, otherwise it wraps into a tall column and pushes the results
     below the fold */
  #lib-rail-list {
    display: flex;
    flex-wrap: nowrap;
    gap: var(--space-1);
    flex-shrink: 0;
  }
}

@media (max-width: 640px) {
  .lib-cards { grid-template-columns: 1fr; }

  /* iOS Safari zooms the viewport on focus when an input's font-size is
     under 16px. 16px keeps the layout stable while typing. */
  .lib-search input,
  .lib-search { font-size: 1rem; }
  .lib-search input { padding-block: var(--space-3); }

  /* 44px minimum touch target for the category strip */
  .lib-rail-item { min-height: 44px; padding-inline: var(--space-4); }
}