/* ───────────────────────────────────────────
   FLIPBOOK OVERLAY
   Full-screen page-flip viewer for catalogues
   ─────────────────────────────────────────── */

.flipbook-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  background: rgba(16, 15, 13, 0.92);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.flipbook-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

/* ── Toolbar ── */
.flipbook-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex: 0 0 auto;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  user-select: none;
  -webkit-user-select: none;
}

.flipbook-toolbar-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.flipbook-toolbar-brand {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  white-space: nowrap;
}

.flipbook-toolbar-title {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.flipbook-toolbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.flipbook-page-indicator {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.6);
  white-space: nowrap;
  padding: 0 8px;
}

.flipbook-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 16px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.flipbook-download-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
}

.flipbook-download-btn svg {
  width: 16px;
  height: 16px;
}

.flipbook-close-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 0;
  background: transparent;
  color: rgba(255, 255, 255, 0.6);
  cursor: pointer;
  transition: color 0.2s ease;
}

.flipbook-close-btn:hover {
  color: #fff;
}

.flipbook-close-btn svg {
  width: 20px;
  height: 20px;
}

/* ── Main viewer area ── */
.flipbook-viewport {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── Navigation arrows ── */
.flipbook-nav {
  position: absolute;
  top: 50%;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-top: -24px;
  border: 0;
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.6);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.flipbook-nav:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
}

.flipbook-nav:disabled {
  opacity: 0.2;
  cursor: default;
  background: transparent;
}

.flipbook-nav--prev {
  left: 12px;
}

.flipbook-nav--next {
  right: 12px;
}

.flipbook-nav svg {
  width: 22px;
  height: 22px;
}

/* ── Page image ── */
.flipbook-slide {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.flipbook-page-img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  margin: 0 auto;
  object-fit: contain;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

/* ── Placeholder for missing pages ── */
.flipbook-missing {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: rgba(255, 255, 255, 0.4);
  text-align: center;
  padding: 32px;
}

.flipbook-missing svg {
  width: 40px;
  height: 40px;
  opacity: 0.3;
}

.flipbook-missing p {
  font-size: 13px;
  line-height: 1.6;
  max-width: 32ch;
}

/* ── Thumbnail strip ── */
.flipbook-thumbs {
  flex: 0 0 auto;
  display: flex;
  gap: 6px;
  padding: 10px 20px;
  overflow-x: auto;
  background: rgba(0, 0, 0, 0.2);
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.flipbook-thumbs::-webkit-scrollbar {
  height: 4px;
}

.flipbook-thumbs::-webkit-scrollbar-track {
  background: transparent;
}

.flipbook-thumbs::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 0;
}

.flipbook-thumb {
  flex: 0 0 auto;
  width: 48px;
  height: 64px;
  border: 2px solid transparent;
  opacity: 0.5;
  cursor: pointer;
  transition: opacity 0.2s ease, border-color 0.2s ease;
  overflow: hidden;
}

.flipbook-thumb:hover {
  opacity: 0.75;
}

.flipbook-thumb.is-active {
  border-color: #fff;
  opacity: 1;
}

.flipbook-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ── Responsive ── */
@media (max-width: 767px) {
  .flipbook-toolbar {
    padding: 10px 12px;
    flex-wrap: wrap;
  }

  .flipbook-toolbar-title {
    font-size: 13px;
    max-width: 140px;
  }

  .flipbook-nav {
    width: 36px;
    height: 36px;
    margin-top: -18px;
  }

  .flipbook-nav--prev { left: 4px; }
  .flipbook-nav--next { right: 4px; }

  .flipbook-nav svg {
    width: 18px;
    height: 18px;
  }

  .flipbook-thumbs {
    padding: 8px 12px;
  }

  .flipbook-thumb {
    width: 36px;
    height: 48px;
  }
}

@media (max-width: 480px) {
  .flipbook-download-btn span {
    display: none;
  }

  .flipbook-toolbar-brand {
    display: none;
  }
}