/* ==========================================================================
   Flipbook Viewer — flipbook_viewer.css
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS custom properties
   -------------------------------------------------------------------------- */
.flipbook-viewer-wrapper {
  --flipbook-toolbar-color: #16213e;
  --flipbook-accent-color:  #e94560;
  --flipbook-stage-bg:      #0d0d1a;
  --flipbook-text:          #e0e0e0;
  --flipbook-border:        #0f3460;
  --flipbook-btn-bg:        #0f3460;
  --flipbook-btn-border:    #1a4a80;
}

/* --------------------------------------------------------------------------
   Background themes
   -------------------------------------------------------------------------- */
.flipbook-viewer-wrapper  { background: #1a1a2e; }
.flipbook-bg--light       { background: #ffffff !important; }
.flipbook-bg--transparent { background: transparent !important; }

.flipbook-bg--light {
  --flipbook-stage-bg:   #f0f0f0;
  --flipbook-text:       #222222;
  --flipbook-border:     #cccccc;
  --flipbook-btn-bg:     #e8e8e8;
  --flipbook-btn-border: #bbbbbb;
}
.flipbook-bg--light .flipbook-toolbar    { border-bottom-color: #cccccc; }
.flipbook-bg--light .flipbook-btn        { color: #333; }
.flipbook-bg--light .flipbook-page-info,
.flipbook-bg--light .flipbook-zoom-level { color: #444; }
.flipbook-bg--light .flipbook-thumbnails { background: #f5f5f5; border-top-color: #cccccc; }
.flipbook-bg--light .flipbook-side-arrow { background: rgba(0,0,0,0.12); border-color: rgba(0,0,0,0.2); color: #333; }

.flipbook-bg--transparent { --flipbook-stage-bg: transparent; }
.flipbook-bg--transparent .flipbook-loading { background: rgba(255,255,255,0.85); }

/* --------------------------------------------------------------------------
   Wrapper
   -------------------------------------------------------------------------- */
.flipbook-viewer-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  border-radius: 6px;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  user-select: none;
  box-sizing: border-box;
  width: 100%;
}

/* --------------------------------------------------------------------------
   Toolbar
   -------------------------------------------------------------------------- */
.flipbook-toolbar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 8px 12px;
  background: var(--flipbook-toolbar-color);
  border-bottom: 1px solid var(--flipbook-border);
  box-sizing: border-box;
  flex-wrap: wrap;
}
.flipbook-toolbar__nav,
.flipbook-toolbar__zoom,
.flipbook-toolbar__actions { display: flex; align-items: center; gap: 5px; }

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.flipbook-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--flipbook-btn-bg);
  color: var(--flipbook-text);
  border: 1px solid var(--flipbook-btn-border);
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  transition: background 0.15s ease, transform 0.1s ease;
  text-decoration: none;
  flex-shrink: 0;
}
.flipbook-btn:hover           { background: var(--flipbook-accent-color); border-color: var(--flipbook-accent-color); color: #fff; }
.flipbook-btn:active          { transform: scale(0.95); }
.flipbook-btn:disabled,
.flipbook-btn[disabled]       { opacity: 0.35; cursor: not-allowed; }

/* --------------------------------------------------------------------------
   Page info & zoom
   -------------------------------------------------------------------------- */
.flipbook-page-info  { color: var(--flipbook-text); font-size: 13px; min-width: 70px; text-align: center; }
.flipbook-zoom-level { color: var(--flipbook-text); font-size: 13px; min-width: 40px; text-align: center; }

/* --------------------------------------------------------------------------
   Loading overlay
   -------------------------------------------------------------------------- */
.flipbook-loading {
  position: absolute;
  inset: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(22, 33, 62, 0.92);
  color: #e0e0e0;
}
.flipbook-loading__spinner {
  width: 48px;
  height: 48px;
  border: 5px solid rgba(255,255,255,0.15);
  border-top-color: var(--flipbook-accent-color);
  border-radius: 50%;
  animation: flipbook-spin 0.75s linear infinite;
  margin-bottom: 14px;
}
@keyframes flipbook-spin { to { transform: rotate(360deg); } }
.flipbook-loading__text { font-size: 14px; margin: 0; }

/* --------------------------------------------------------------------------
   Error / unsupported
   -------------------------------------------------------------------------- */
.flipbook-error           { padding: 24px; color: #f88; text-align: center; }
.flipbook-error a         { color: var(--flipbook-accent-color); text-decoration: underline; }
.flipbook-unsupported     { padding: 40px; color: #aaa; text-align: center; }

/* --------------------------------------------------------------------------
   Stage row — flex row: [left-arrow-col] [stage] [right-arrow-col]
   overflow:visible so arrows are never clipped when book is zoomed.
   -------------------------------------------------------------------------- */
.flipbook-stage-row {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  box-sizing: border-box;
  background: var(--flipbook-stage-bg);
  position: relative;
  overflow: visible;   /* must be visible so arrows survive zoom */
}

/* --------------------------------------------------------------------------
   Stage — sized by JS. overflow:hidden clips Turn.js page-turn animation.
   -------------------------------------------------------------------------- */
.flipbook-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex: 0 0 auto;
  box-sizing: border-box;
  position: relative;
  z-index: 1;
}

/* --------------------------------------------------------------------------
   Side arrows — compact pill buttons, vertically centered in their column.
   flex: 0 0 44px gives each a 44px column; the button itself is 36×48px
   so there is 4px breathing room on each side. z-index keeps them above
   the (potentially zoomed/transformed) book canvas.
   -------------------------------------------------------------------------- */
.flipbook-side-arrow {
  /* Column sizing — reserves space so the book never touches the buttons */
  flex: 0 0 44px;
  width: 44px;
  min-width: 44px;
  /* Button is a compact pill, NOT a full-height bar */
  height: 48px;
  align-self: center;   /* vertically centered, not stretched */
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  border-radius: 24px;    /* pill shape */
  background: rgba(30, 30, 50, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: #fff;
  cursor: pointer;
  /* Start subtle, appear on hover */
  opacity: 0;
  transition: opacity 0.18s ease, background 0.15s ease, transform 0.1s ease;
  position: relative;
  z-index: 10;            /* above zoomed book */
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  flex-shrink: 0;
}

/* Reveal on wrapper hover/focus */
.flipbook-viewer-wrapper:hover        .flipbook-side-arrow,
.flipbook-viewer-wrapper:focus-within .flipbook-side-arrow { opacity: 0.85; }

.flipbook-side-arrow:hover  {
  background: var(--flipbook-accent-color);
  border-color: var(--flipbook-accent-color);
  opacity: 1;
  transform: scale(1.08);
}
.flipbook-side-arrow:active { transform: scale(0.95); }

.flipbook-side-arrow:disabled,
.flipbook-side-arrow[disabled] {
  opacity: 0.12 !important;
  cursor: not-allowed;
  pointer-events: none;
}

/* Light theme */
.flipbook-bg--light .flipbook-side-arrow {
  background: rgba(0, 0, 0, 0.12);
  border-color: rgba(0, 0, 0, 0.2);
  color: #333;
}

/* Touch devices: always show at reduced opacity — no hover available */
@media (hover: none) {
  .flipbook-side-arrow {
    opacity: 0.7;
    height: 52px;
  }
}

/* --------------------------------------------------------------------------
   Turn.js book container
   -------------------------------------------------------------------------- */
.flipbook-book {
  position: relative;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.7);
  transform-origin: center center;
  transition: transform 0.2s ease;
}

/* Individual page */
.flipbook-page       { overflow: hidden; background: #fff; }
.flipbook-page img   { display: block; width: 100%; height: 100%; object-fit: contain; }

/* Click-to-flip cursors */
.flipbook-book.click-to-flip-enabled .flipbook-page:nth-child(odd)  { cursor: e-resize; }
.flipbook-book.click-to-flip-enabled .flipbook-page:nth-child(even) { cursor: w-resize; }

/* --------------------------------------------------------------------------
   Thumbnail strip
   -------------------------------------------------------------------------- */
.flipbook-thumbnails {
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: 6px;
  padding: 8px 12px;
  background: var(--flipbook-toolbar-color);
  width: 100%;
  box-sizing: border-box;
  border-top: 1px solid var(--flipbook-border);
  scrollbar-width: thin;
  scrollbar-color: var(--flipbook-border) var(--flipbook-toolbar-color);
}
.flipbook-thumbnails::-webkit-scrollbar       { height: 4px; }
.flipbook-thumbnails::-webkit-scrollbar-track { background: var(--flipbook-toolbar-color); }
.flipbook-thumbnails::-webkit-scrollbar-thumb { background: var(--flipbook-border); border-radius: 2px; }

.flipbook-thumbnail {
  flex: 0 0 auto;
  width: 52px;
  height: 68px;
  border: 2px solid transparent;
  border-radius: 3px;
  overflow: hidden;
  cursor: pointer;
  background: #fff;
  transition: border-color 0.15s ease, transform 0.1s ease;
}
.flipbook-thumbnail:hover     { border-color: var(--flipbook-accent-color); transform: translateY(-2px); }
.flipbook-thumbnail.is-active { border-color: var(--flipbook-accent-color); }
.flipbook-thumbnail img       { width: 100%; height: 100%; object-fit: cover; display: block; }

/* --------------------------------------------------------------------------
   Fullscreen
   -------------------------------------------------------------------------- */
.flipbook-viewer-wrapper.is-fullscreen {
  position: fixed;
  inset: 0;
  z-index: 9999;
  border-radius: 0;
  background: #0d0d1a !important;
}
.flipbook-viewer-wrapper.is-fullscreen .flipbook-stage-row {
  flex: 1;
}

/* --------------------------------------------------------------------------
   Responsive — tablet (≤ 768px)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .flipbook-toolbar      { padding: 6px 8px; gap: 4px; }
  .flipbook-btn          { width: 30px; height: 30px; font-size: 13px; }
  .flipbook-page-info    { min-width: 60px; font-size: 12px; }
  .flipbook-zoom-level   { min-width: 36px; font-size: 12px; }
  .flipbook-side-arrow   { flex: 0 0 36px; width: 36px; min-width: 36px; height: 44px; font-size: 17px; border-radius: 22px; }
  .flipbook-thumbnail    { width: 44px; height: 58px; }
}

/* --------------------------------------------------------------------------
   Responsive — mobile (≤ 480px)
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  .flipbook-toolbar        { padding: 5px 6px; gap: 3px; }
  .flipbook-btn            { width: 26px; height: 26px; font-size: 11px; }
  .flipbook-page-info      { min-width: 50px; font-size: 11px; }
  .flipbook-toolbar__zoom  { display: none; }
  .flipbook-side-arrow     { flex: 0 0 30px; width: 30px; min-width: 30px; height: 40px; font-size: 14px; border-radius: 20px; }
  .flipbook-thumbnail      { width: 36px; height: 48px; }
}