/* ==========================================================
   PDF Viewer Block — stylized skin
   ========================================================== */
.ccm-block-pdf-viewer {
  --pv-bg:          #f6f6f6;
  --pv-surface:     #fcfcfc;
  --pv-surface-2:   #3155a4;
  --pv-border:      #c8c8c8;
  --pv-text:        #1a1f2e;
  --pv-button-text: #fcfcfc;
  --pv-text-dim:    #dbdbdb;
  --pv-accent:      #e4ecf7;
  --pv-accent-hover:#e4ecf7;
  --pv-danger:      #dc2626;
  --pv-radius:      6px;
  --pv-radius-lg:   10px;
  --pv-shadow:      0 4px 20px rgba(0,0,0,.2);
  --pv-tb-height:   56px;

  position: relative;
  background: var(--pv-bg);
  color: var(--pv-text);
  border-radius: var(--pv-radius-lg);
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  box-shadow: var(--pv-shadow);
}

.ccm-block-pdf-viewer.pv-light {
  --pv-bg:        #f5f6f8;
  --pv-surface:   #ffffff;
  --pv-surface-2: #f0f2f5;
  --pv-border:    #e0e3e8;
  --pv-text:      #1a1f2e;
  --pv-text-dim:  #6b7280;
  --pv-shadow:    0 4px 20px rgba(0,0,0,.08);
}

.ccm-block-pdf-viewer * { box-sizing: border-box; }

/* ==========================================================
   Toolbar
   ========================================================== */
.ccm-block-pdf-viewer .pv-toolbar {
  display: flex; align-items: center; gap: 10px;
  padding: 0 16px;
  height: var(--pv-tb-height);
  background: var(--pv-surface);
  border-bottom: 1px solid var(--pv-border);
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
  flex-shrink: 0;
  z-index: 2;
}

.ccm-block-pdf-viewer .pv-title {
  font-size: 20px; 
  font-weight: 600;
  max-width: 30%;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  color: var(--pv-text);
}

.ccm-block-pdf-viewer .pv-spacer { flex: 1; }

.ccm-block-pdf-viewer .pv-spacer.half-flex { flex: 0.5; }

.ccm-block-pdf-viewer .pv-group {
  display: flex; align-items: center; gap: 2px;
  background: var(--pv-surface-2);
  border-radius: var(--pv-radius);
  padding: 3px;
}

.ccm-block-pdf-viewer .pv-btn {
  background: transparent; border: none;
  color: var(--pv-button-text);
  width: 34px; height: 34px;
  border-radius: 4px; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background .15s, color .15s, transform .05s;
  padding: 0;
}
.ccm-block-pdf-viewer .pv-btn:hover:not(:disabled) { background: var(--pv-surface); color: var(--pv-text); }
.ccm-block-pdf-viewer .pv-btn:active:not(:disabled) { transform: scale(.95); }
.ccm-block-pdf-viewer .pv-btn:disabled { opacity: .35; cursor: not-allowed; }
.ccm-block-pdf-viewer .pv-btn.pv-active {
  background: var(--pv-accent); color: #3155a4;
}
.ccm-block-pdf-viewer .pv-btn svg {
  width: 18px; height: 18px;
  fill: none; stroke: currentColor;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}

.ccm-block-pdf-viewer .pv-input {
  background: var(--pv-surface); border: 1px solid var(--pv-border);
  color: var(--pv-text);
  border-radius: 4px; padding: 0 8px;
  height: 30px; width: 52px;
  text-align: center; font-size: 13px;
  -moz-appearance: textfield;
}
.ccm-block-pdf-viewer .pv-input::-webkit-outer-spin-button,
.ccm-block-pdf-viewer .pv-input::-webkit-inner-spin-button {
  -webkit-appearance: none; margin: 0;
}
.ccm-block-pdf-viewer .pv-input:focus {
  outline: none;
  border-color: var(--pv-accent);
  box-shadow: 0 0 0 2px rgba(79,140,255,.2);
}

.ccm-block-pdf-viewer .pv-label {
  color: var(--pv-text-dim);
  font-size: 13px;
  padding: 0 4px;
  white-space: nowrap;
}

.ccm-block-pdf-viewer .pv-select {
  background: var(--pv-surface); border: 1px solid var(--pv-border);
  color: var(--pv-text);
  border-radius: 4px; padding: 0 8px;
  height: 30px; font-size: 13px;
  cursor: pointer;
}
.ccm-block-pdf-viewer .pv-select:focus {
  outline: none;
  border-color: var(--pv-accent);
}

/* ==========================================================
   Body (sidebar + canvas layout)
   ========================================================== */
.ccm-block-pdf-viewer .pv-body {
  display: flex;
  align-items: stretch;
}

/* ==========================================================
   Sidebar / chapters
   ========================================================== */
.ccm-block-pdf-viewer .pv-sidebar {
  flex: 0 0 260px;
  background: var(--pv-surface);
  border-right: 1px solid var(--pv-border);
  overflow-y: auto;
  overflow-x: hidden;
  max-height: 80vh;
  padding: 16px 8px;
  transition: flex-basis .25s ease, padding .25s ease, border-color .25s ease;
}

.ccm-block-pdf-viewer .pv-sidebar-inner {
  width: 260px;       /* matches desktop sidebar width */
  max-width: 260px;
}

.ccm-block-pdf-viewer .pv-sidebar.pv-collapsed {
  flex-basis: 0;
  padding: 0;
  border-right-color: transparent;
  overflow: hidden;
}

.ccm-block-pdf-viewer .pv-sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 8px 12px;
  font-size: 14px; font-weight: 600;
  color: var(--pv-text);
  white-space: nowrap;
}

.ccm-block-pdf-viewer .pv-outline {
  list-style: none;
  padding: 0;
  margin: 0;
}

.ccm-block-pdf-viewer .pv-outline-item {
  margin: 2px 0;
}

.ccm-block-pdf-viewer .pv-outline-link {
  display: flex;
  align-items: flex-start;
  gap: 4px;
  padding: 6px 10px;
  color: var(--pv-text);
  text-decoration: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1.4;
  transition: background .15s, color .15s;
}

.ccm-block-pdf-viewer .pv-outline-link:hover {
  background: var(--pv-accent-hover);
}

.ccm-block-pdf-viewer .pv-outline-link.pv-active {
  background: var(--pv-accent);
  color: #3155a4;
}
.ccm-block-pdf-viewer .pv-outline-link.pv-active .pv-outline-toggle {
  color: #3155a4;
}

/* Nested levels */
.ccm-block-pdf-viewer .pv-outline .pv-outline {
  padding-left: 14px;
}

/* Top-level items stand out */
.ccm-block-pdf-viewer .pv-outline > .pv-outline-item > .pv-outline-link {
  font-weight: 600;
  color: var(--pv-text);
}
.ccm-block-pdf-viewer .pv-outline > .pv-outline-item > .pv-outline-link.pv-active {
  color: #3155a4;
}

/* Expand/collapse toggle for items with children */
.ccm-block-pdf-viewer .pv-outline-toggle {
  display: inline-block;
  width: 14px;
  flex-shrink: 0;
  text-align: center;
  color: var(--pv-text-dim);
  cursor: pointer;
  user-select: none;
  transition: transform .15s;
  line-height: 1.4;
}
.ccm-block-pdf-viewer .pv-outline-item.pv-collapsed > .pv-outline-link .pv-outline-toggle {
  transform: rotate(-90deg);
}
.ccm-block-pdf-viewer .pv-outline-item.pv-collapsed > .pv-outline {
  display: none;
}

.ccm-block-pdf-viewer .pv-outline-label {
  flex: 1;
  min-width: 0;
  word-break: break-word;
  font-size: 16px;
}

.ccm-block-pdf-viewer .pv-outline-link.with-kids .pv-outline-label{
  font-size: 18px;
}

/* Empty / loading state */
.ccm-block-pdf-viewer .pv-outline-empty {
  padding: 16px 10px;
  color: var(--pv-text-dim);
  font-size: 13px;
  font-style: italic;
}

/* ==========================================================
   Canvas area
   ========================================================== */
.ccm-block-pdf-viewer .pv-canvas-wrap {
  position: relative;
  flex: 1;
  min-width: 0;
  overflow: auto;
  background: var(--pv-bg);
  max-height: 80vh;
  padding: 16px;
  text-align: center;
}

.ccm-block-pdf-viewer .pv-canvas {
  display: block;
  max-width: 100%;
  background: #fff;
  border-radius: var(--pv-radius);
  box-shadow: var(--pv-shadow);
}

.ccm-block-pdf-viewer .pv-page {
  position: relative;
  display: inline-block;
}

.ccm-block-pdf-viewer .pv-annotation-layer {
  position: absolute;
  left: 0;
  top: 0;
  pointer-events: none;
}

.ccm-block-pdf-viewer .pv-annotation-layer a {
  position: absolute;
  display: block;
  pointer-events: auto;
  background: transparent;
  text-decoration: none;
  border-radius: 2px;
  transition: background-color .15s ease;
}

.ccm-block-pdf-viewer .pv-annotation-layer a:hover {
  background: rgba(255, 235, 59, 0.2);
  outline: 1px solid rgba(255, 193, 7, 0.5);
}

/* Scrollbars */
.ccm-block-pdf-viewer .pv-canvas-wrap::-webkit-scrollbar,
.ccm-block-pdf-viewer .pv-sidebar::-webkit-scrollbar { width: 10px; height: 10px; }
.ccm-block-pdf-viewer .pv-canvas-wrap::-webkit-scrollbar-track,
.ccm-block-pdf-viewer .pv-sidebar::-webkit-scrollbar-track { background: var(--pv-surface); }
.ccm-block-pdf-viewer .pv-canvas-wrap::-webkit-scrollbar-thumb,
.ccm-block-pdf-viewer .pv-sidebar::-webkit-scrollbar-thumb {
  background: var(--pv-border); border-radius: 5px;
}
.ccm-block-pdf-viewer .pv-canvas-wrap::-webkit-scrollbar-thumb:hover,
.ccm-block-pdf-viewer .pv-sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--pv-text-dim);
}

/* ==========================================================
   Loading + error overlays
   ========================================================== */
.ccm-block-pdf-viewer .pv-overlay {
  position: absolute;
  inset: var(--pv-tb-height) 0 0 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 12px;
  background: var(--pv-bg);
  color: var(--pv-text-dim); font-size: 14px;
  z-index: 3;
}
.ccm-block-pdf-viewer .pv-overlay.pv-error { color: var(--pv-danger); }
.ccm-block-pdf-viewer .pv-overlay.pv-hidden { display: none; }

.ccm-block-pdf-viewer .pv-spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--pv-surface-2);
  border-top-color: var(--pv-accent);
  border-radius: 50%;
  animation: pv-spin .8s linear infinite;
}
@keyframes pv-spin { to { transform: rotate(360deg); } }

.ccm-block-pdf-viewer .pv-progress-bar {
  position: absolute; left: 0; right: 0;
  top: var(--pv-tb-height);
  height: 2px; background: transparent;
  z-index: 4;
}
.ccm-block-pdf-viewer .pv-progress-fill {
  height: 100%; width: 0;
  background: var(--pv-accent);
  transition: width .2s ease;
}

/* Placeholder when no PDF selected */
.ccm-block-pdf-viewer .pv-empty {
  padding: 40px 20px; text-align: center;
  color: var(--pv-text-dim);
}
/* ==========================================================
   Mobile: sidebar becomes a slide-over overlay
   ========================================================== */
@media (max-width: 720px) {
  .ccm-block-pdf-viewer .pv-toolbar { padding: 0 8px; gap: 6px; }
  .ccm-block-pdf-viewer .pv-title { display: none; }
  .ccm-block-pdf-viewer .pv-hide-mobile { display: none; }
  .ccm-block-pdf-viewer .pv-btn { width: 32px; height: 32px; }
  .ccm-block-pdf-viewer .pv-canvas-wrap { padding: 8px; }

  /* Body becomes a positioning context for the overlay */
  .ccm-block-pdf-viewer .pv-body {
    position: relative;
  }

  /* Sidebar becomes an absolute-positioned slide-over panel */
  .ccm-block-pdf-viewer .pv-sidebar {
    position: absolute;
    top: 0; left: 0; bottom: 0;
    width: min(85%, 320px);
    flex: 0 0 auto;
    max-height: none;
    z-index: 10;
    box-shadow: 8px 0 24px rgba(0,0,0,.4);
    transform: translateX(0);
    transition: transform .25s ease;
    /* Override desktop's flex-basis collapse behavior */
    padding: 16px 8px;
    border-right: 1px solid var(--pv-border);
  }
  .ccm-block-pdf-viewer .pv-sidebar-inner {
    width: 100%;
    max-width: none;
  }

  /* Collapsed state = slid off-screen to the left */
  .ccm-block-pdf-viewer .pv-sidebar.pv-collapsed {
    transform: translateX(-105%);
    flex-basis: auto;       /* undo desktop rule */
    padding: 16px 8px;      /* undo desktop rule */
    border-right: 1px solid var(--pv-border);
  }

  /* Backdrop behind the sidebar when open */
  .ccm-block-pdf-viewer .pv-sidebar-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,.5);
    z-index: 9;
    opacity: 1;
    transition: opacity .25s ease;
    cursor: pointer;
  }
  .ccm-block-pdf-viewer .pv-sidebar-backdrop.pv-hidden {
    opacity: 0;
    pointer-events: none;
  }

  /* Close button inside the mobile sidebar header */
  .ccm-block-pdf-viewer .pv-sidebar-close {
    display: inline-flex;
    align-items: center; justify-content: center;
    width: 30px; height: 30px;
    border: none; background: transparent;
    color: var(--pv-text-dim);
    cursor: pointer;
    border-radius: 4px;
    padding: 0;
  }
  .ccm-block-pdf-viewer .pv-sidebar-close:hover {
    background: var(--pv-surface-2);
    color: var(--pv-text);
  }
  .ccm-block-pdf-viewer .pv-sidebar-close svg {
    width: 18px; height: 18px;
    fill: none; stroke: currentColor;
    stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
  }
}

/* Hide the close button on desktop — toolbar toggle is enough there */
@media (min-width: 721px) {
  .ccm-block-pdf-viewer .pv-sidebar-close { display: none; }
  .ccm-block-pdf-viewer .pv-sidebar-backdrop { display: none; }
}