/* Light themed PDF viewer inspired by the video playlist styling */
:root {
  --pdf-bg: #f7f9fc;
  --pdf-panel: #ffffff;
  --pdf-ink: #111827;
  --pdf-muted: #6b7280;
  --pdf-accent: #6366f1;
  --pdf-outline: #e5e7eb;
}

.pdf-wrap.light {
  --pdf-view-height: 70vh;
  display: grid;
  grid-template-columns: 90% 10%;
  grid-auto-rows: 1fr;
  gap: 14px;
  background: var(--pdf-bg);
  padding: 16px;
  border-radius: 16px;
  align-items: stretch;
}

@media (max-width: 768px) {
  .pdf-wrap.light {
    grid-template-columns: 80% 20%;
  }
}

.pdf-viewer {
  background: var(--pdf-panel);
  border-radius: 16px;
  padding: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .06);
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: var(--pdf-view-height);
  height: var(--pdf-view-height);
  min-width: 0;
}

.pdf-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.pdf-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--pdf-ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1 1 auto;
}

.pdf-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pdf-btn {
  border: 0;
  background: var(--pdf-panel);
  color: var(--pdf-ink);
  border-radius: 0.55rem;
  width: 2.4rem;
  height: 2.4rem;
  font-size: 1.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px var(--pdf-outline);
  transition: background .15s ease, color .15s ease, transform .08s ease;
  text-decoration: none;
}

.pdf-btn:hover {
  background: #eef2ff;
  color: var(--pdf-accent);
}

.pdf-btn:focus {
  outline: 2px solid var(--pdf-accent);
  outline-offset: 2px;
}

.pdf-btn:active {
  transform: translateY(1px);
}

.pdf-frame-wrap {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .08);
  flex: 1 1 auto;
  display: flex;
}

.pdf-frame {
  width: 100%;
  border: 0;
  background: #111;
  flex: 1 1 auto;
  min-height: 0;
  height: 100%;
}

.pdf-list {
  background: var(--pdf-panel);
  border-radius: 16px;
  padding: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .06);
  overflow: auto;
  min-height: var(--pdf-view-height);
  height: var(--pdf-view-height);
  display: flex;
  flex-direction: column;
  min-width: 0;
}

@media (max-width: 900px) {
  .pdf-list {
    max-height: none;
  }
}

.pdf-tree {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: .4rem;
  flex: 1 1 auto;
}

.pnode {
  display: flex;
  flex-direction: column;
  gap: .35rem;
}

.pnode-label {
  display: flex;
  align-items: center;
  gap: .5rem;
  width: 100%;
  text-align: left;
  background: var(--pdf-panel);
  color: var(--pdf-muted);
  border: 1px solid var(--pdf-outline);
  border-left: 3px solid var(--pdf-accent);
  border-radius: 8px;
  padding: .45rem .6rem;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background .15s ease;
}

.pnode-label:hover {
  background: #f8fafc;
}

.pnode-caret {
  transition: transform .18s ease;
}

.pnode.folder:not(.open) .pnode-caret {
  transform: rotate(0deg);
}

.pnode.folder.open .pnode-caret {
  transform: rotate(90deg);
}

.pnode-name {
  flex: 1 1 auto;
  min-width: 0;
  color: var(--pdf-ink);
}

.pnode-children {
  display: none;
  padding-left: 0;
  margin: 0;
  width: 100%;
}

.pnode-children > ul {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
}

.pnode-children > ul > li {
  width: 100%;
}

.pnode.folder.open > .pnode-children {
  display: block;
}

.pitem {
  display: block;
  width: 100%;
  border: 1px solid var(--pdf-outline);
  border-radius: .7rem;
  background: var(--pdf-panel);
  padding: .35rem;
  cursor: pointer;
  text-align: left;
  transition: background .15s ease, box-shadow .15s ease;
}

.pitem:hover {
  background: #f1f5f9;
}

.pitem.active {
  box-shadow: 0 0 0 2px var(--pdf-accent);
}

.pnode.file {
  display: block;
  width: 100%;
}

.pitem-thumb {
  position: relative;
  display: block;
  width: 100%;
  padding-top: 130%;
  border-radius: .5rem;
  overflow: hidden;
  background: #e5e7eb;
}

.pitem-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.pitem-thumb.ph {
  display: flex;
  align-items: center;
  justify-content: center;
}

.pitem-icon {
  font-size: 2rem;
  color: var(--pdf-muted);
}

.pitem-label {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  padding: .35rem .45rem;
  background: rgba(255, 255, 255, .55);
  color: #111827;
  font-size: .82rem;
  font-weight: 600;
  line-height: 1.2;
  text-shadow: none;
  z-index: 2;
}

.pdf-viewer.is-fullscreen,
.pdf-viewer:fullscreen,
.pdf-viewer:-webkit-full-screen {
  width: 100%;
  height: 100%;
  padding: 16px;
  box-sizing: border-box;
}

.pdf-viewer.is-fullscreen .pdf-frame-wrap,
.pdf-viewer:fullscreen .pdf-frame-wrap,
.pdf-viewer:-webkit-full-screen .pdf-frame-wrap {
  min-height: 0;
}

.pdf-viewer.is-fullscreen .pdf-frame,
.pdf-viewer:fullscreen .pdf-frame,
.pdf-viewer:-webkit-full-screen .pdf-frame {
  height: 100%;
  min-height: 0;
}

.pdf-browser.empty {
  background: var(--pdf-bg);
  padding: 24px;
  border-radius: 14px;
  text-align: center;
  color: var(--pdf-muted);
  font-weight: 600;
}

.pdf-browser.empty::before {
  content: '\1F4D6';
  display: block;
  font-size: 2rem;
  margin-bottom: .35rem;
}

@media (max-width: 600px) {
  .pdf-frame {
    min-height: 60vh;
  }

  .pdf-toolbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .pdf-actions {
    width: 100%;
    justify-content: flex-end;
  }
}