/* ==========================================================================
   Custom Flipbook Viewer — flipbook.css
   ========================================================================== */

/* --------------------------------------------------------------------------
   Thumbnail card (.fb-thumb) — Clean, Minimalist Portfolio Cards
   -------------------------------------------------------------------------- */

.fb-thumb-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

.fb-thumb {
  position: relative;
  width: 320px;
  max-width: 100%;
  margin: 16px auto;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  outline: none !important;
  border: none !important;
  transition: transform 0.25s cubic-bezier(0.2, 0.8, 0.4, 1);
}

.fb-thumb:focus,
.fb-thumb:focus-visible,
.fb-thumb:focus-within {
  outline: none !important;
  border: none !important;
  box-shadow: none;
}

.fb-thumb:hover {
  transform: translateY(-6px);
}

.fb-thumb:active {
  transform: translateY(-1px) scale(0.99);
}

/* Minimalist Clean Card Container */
.fb-thumb-card {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 12px;
  background: #ffffff;
  overflow: hidden;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
}

.fb-thumb:hover .fb-thumb-card {
  border-color: rgba(120, 80, 200, 0.3);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.14), 0 4px 12px rgba(0, 0, 0, 0.06);
}

/* Cover Image: 100% full view, zero clipping */
.fb-thumb-cover {
  width: 100%;
  height: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  object-position: center;
  display: block;
  background: #ffffff;
}

/* Centered Title */
.fb-thumb-title {
  margin-top: 14px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #1a1a1a;
  letter-spacing: -0.01em;
  text-align: center;
  transition: color 0.2s ease;
}

.fb-thumb:hover .fb-thumb-title {
  color: #2563eb;
}

/* --------------------------------------------------------------------------
   Overlay — full screen with frosted glass backdrop
   -------------------------------------------------------------------------- */

.fb-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(8, 5, 18, 0.62);
  backdrop-filter: blur(20px) saturate(170%);
  -webkit-backdrop-filter: blur(20px) saturate(170%);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.28s ease, visibility 0.28s ease;
}

.fb-overlay.fb-open {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
  z-index: 10000;
}

:fullscreen .fb-overlay,
:-webkit-full-screen .fb-overlay,
.fb-overlay:fullscreen,
.fb-overlay:-webkit-full-screen {
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  background: #08060f;
  width: 100vw;
  height: 100vh;
}

/* --------------------------------------------------------------------------
   Modal — fills overlay with transparent background
   -------------------------------------------------------------------------- */

.fb-modal {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: transparent;
  touch-action: none;
  -webkit-touch-callout: none;
}

/* --------------------------------------------------------------------------
   Top bar controls — Quick close
   -------------------------------------------------------------------------- */

.fb-top-close {
  position: absolute;
  top: 18px;
  right: 22px;
  z-index: 100;
  width: 40px;
  height: 40px;
  border-radius: 50% !important;
  background: rgba(20, 14, 32, 0.85) !important;
  backdrop-filter: blur(20px) !important;
  -webkit-backdrop-filter: blur(20px) !important;
  border: 1px solid rgba(255, 255, 255, 0.18) !important;
  color: #ffffff !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  cursor: pointer !important;
  padding: 0 !important;
  outline: none !important;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5) !important;
  transition: all 0.18s ease !important;
}

.fb-top-close svg {
  width: 20px !important;
  height: 20px !important;
  stroke: #ffffff !important;
  stroke-width: 2.2 !important;
  display: block !important;
  pointer-events: none !important;
}

.fb-top-close:hover {
  background: rgba(220, 50, 60, 0.9) !important;
  border-color: rgba(255, 120, 130, 0.6) !important;
  color: #ffffff !important;
  transform: scale(1.1) !important;
}

.fb-top-close:active {
  transform: scale(0.92) !important;
}

/* Side navigation arrow overlays */
.fb-nav-arrow {
  position: absolute;
  top: calc(50% - 24px);
  z-index: 80;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: rgba(18, 14, 28, 0.45);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0.35;
  outline: none !important;
  -webkit-tap-highlight-color: transparent;
  box-shadow: 0 6px 22px rgba(0, 0, 0, 0.45);
  transition: opacity 0.25s ease, transform 0.22s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.2s ease, color 0.2s ease;
}

.fb-nav-prev { left: 24px; }
.fb-nav-next { right: 24px; }

.fb-nav-arrow:focus,
.fb-nav-arrow:focus-visible {
  outline: none !important;
}

@media (hover: hover) and (pointer: fine) {
  .fb-nav-arrow:hover {
    opacity: 1;
    transform: scale(1.12);
    background: rgba(26, 20, 40, 0.9);
    color: #fff;
    border-color: rgba(180, 150, 240, 0.4);
  }
}

.fb-nav-arrow:active {
  opacity: 0.85;
  transform: scale(0.92);
  background: rgba(26, 20, 40, 0.85);
}

/* --------------------------------------------------------------------------
   Toolbar — Floating bottom-middle dock
   -------------------------------------------------------------------------- */

.fb-toolbar {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 4px 10px;
  background: rgba(18, 14, 28, 0.84);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 40px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.58), inset 0 1px 0 rgba(255, 255, 255, 0.14);
  user-select: none;
  -webkit-user-select: none;
  opacity: 1;
  transition: opacity 0.35s ease, transform 0.35s ease;
}

.fb-toolbar.fb-tb-idle,
.fb-idle-dim {
  opacity: 0.25 !important;
}

.fb-toolbar:hover,
.fb-toolbar:focus-within {
  opacity: 1 !important;
}

.fb-sep {
  width: 1px;
  height: 18px;
  background: rgba(255, 255, 255, 0.12);
  margin: 0 3px;
  flex-shrink: 0;
}

.fb-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: rgba(255, 255, 255, 0.75);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, transform 0.12s;
  flex-shrink: 0;
  padding: 0;
  text-decoration: none;
  font-family: inherit;
}
.fb-btn:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  transform: scale(1.08);
  text-decoration: none;
}
.fb-btn:active { transform: scale(0.92); }
.fb-btn svg   { pointer-events: none; }

.fb-page-wrap {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0 2px;
}

.fb-page-in {
  width: 38px;
  height: 26px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.95);
  font-size: 0.82rem;
  font-weight: 500;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s, background 0.15s;
}
.fb-page-in:focus {
  border-color: rgba(180, 155, 240, 0.7);
  background: rgba(255, 255, 255, 0.14);
}

.fb-page-tot {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.45);
  white-space: nowrap;
  padding-right: 2px;
}

.fb-dl  { text-decoration: none; }
.fb-close { margin-left: 0; }

/* --------------------------------------------------------------------------
   Stage — holds the book spread, clips zoom overflow
   -------------------------------------------------------------------------- */

.fb-stage {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: stretch;
  justify-content: center;
  overflow: hidden;
  padding: 10px 10px 62px 10px;
  box-sizing: border-box;
  position: relative;
  touch-action: none;
  cursor: default;
}

.fb-stage.fb-grab {
  cursor: grab;
}

.fb-stage.fb-grabbing {
  cursor: grabbing;
}

.fb-stage-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  transform-origin: center center;
  transition: transform 0.24s cubic-bezier(0.645, 0.045, 0.355, 1.000);
}

/* --------------------------------------------------------------------------
   Book spread
   -------------------------------------------------------------------------- */

.fb-book {
  position: relative;
  display: flex;
  align-items: stretch;
  justify-content: center;
  height: 100%;
  width: 100%;
  /* Perspective origin for 3D page-flip children */
  perspective: 3200px;
  perspective-origin: center 45%;
  max-width: 100%;
  filter: drop-shadow(0 28px 60px rgba(0, 0, 0, 0.40)) drop-shadow(0 8px 18px rgba(0, 0, 0, 0.25));
  transform: translateX(0);
  transition: transform 0.24s cubic-bezier(0.645, 0.045, 0.355, 1.000);
}



/* ---- Page slots ---- */
.fb-slot {
  position: relative;
  flex: 1 1 50%;
  max-width: 50%;
  width: 50%;
  height: 100%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
}

.fb-left {
  border-radius: 4px 0 0 4px;
}

.fb-right {
  border-radius: 0 4px 4px 0;
}

/* Cover mode: book is translated left by 25% of its width so the right slot (cover) is centered */
.fb-book.fb-cover-mode {
  transform: translateX(-25%);
}

.fb-book.fb-cover-mode .fb-right {
  border-radius: 2px 8px 8px 2px;
}

/* Page image inside slot */
.fb-pg {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -webkit-user-drag: none;
  user-drag: none;
  pointer-events: none;
}

/* Left page images anchor to the spine (right edge of slot) */
.fb-left .fb-pg,
.fb-flipper-right .fb-face-back .fb-pg,
.fb-flipper-left .fb-face-front .fb-pg {
  object-position: right center;
}

/* Right page images anchor to the spine (left edge of slot) */
.fb-right .fb-pg,
.fb-flipper-right .fb-face-front .fb-pg,
.fb-flipper-left .fb-face-back .fb-pg {
  object-position: left center;
}

/* --------------------------------------------------------------------------
   Page flipper — CSS 3D book-page turn
   -------------------------------------------------------------------------- */

.fb-flipper {
  position: absolute;
  top: 0;
  height: 100%;
  width: 50%;
  transform-style: preserve-3d;
  z-index: 20;
  pointer-events: none;
}

/* Right-side flipper: peels RIGHT → LEFT (forward) */
.fb-flipper-right {
  left: 50%;
  transform-origin: left center;
}

/* Left-side flipper: peels LEFT → RIGHT (backward) */
.fb-flipper-left {
  left: 0;
  transform-origin: right center;
}

/* ---- Faces ---- */
.fb-face {
  position: absolute;
  inset: 0;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  /* Critical: hide face when rotated away from viewer */
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

/* Back face: pre-rotated 180° so content reads correctly when revealed */
.fb-face-back {
  transform: rotateY(180deg);
}



/* ---- Flip keyframe animations ---- */

@keyframes fb-flip-fwd {
  from { transform: rotateY(0deg);    }
  to   { transform: rotateY(-180deg); }
}

@keyframes fb-flip-bwd {
  from { transform: rotateY(0deg);   }
  to   { transform: rotateY(180deg); }
}

/* Trigger by adding .fb-go class via JS */
.fb-flipper-right.fb-go {
  animation: fb-flip-fwd 0.24s cubic-bezier(0.645, 0.045, 0.355, 1.000) forwards;
}

.fb-flipper-left.fb-go {
  animation: fb-flip-bwd 0.24s cubic-bezier(0.645, 0.045, 0.355, 1.000) forwards;
}

/* --------------------------------------------------------------------------
   Loading spinner (paper color, subtle)
   -------------------------------------------------------------------------- */

.fb-spinner {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.fb-spinner::after {
  content: '';
  width: 30px;
  height: 30px;
  border: 3px solid rgba(0, 0, 0, 0.08);
  border-top-color: rgba(90, 60, 130, 0.35);
  border-radius: 50%;
  animation: fb-spin 0.75s linear infinite;
}
@keyframes fb-spin { to { transform: rotate(360deg); } }

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 600px) {
  .fb-thumb {
    width: 100%;
    max-width: 280px;
    margin: 10px auto;
  }
  .fb-thumb-title {
    font-size: 0.96rem;
  }
  .fb-stage {
    padding: 6px 6px 52px 6px;
  }
  .fb-toolbar {
    bottom: 10px;
    gap: 2px;
    padding: 3px 6px;
    max-width: calc(100vw - 16px);
  }
  .fb-btn   { width: 32px; height: 32px; }
  .fb-page-in { width: 32px; height: 24px; font-size: 0.75rem; }
  .fb-page-tot { font-size: 0.75rem; }
  .fb-nav-arrow {
    width: 38px;
    height: 38px;
    top: calc(50% - 19px);
    opacity: 0.30;
    background: rgba(18, 14, 28, 0.40);
  }
  .fb-nav-prev { left: 8px; }
  .fb-nav-next { right: 8px; }
}