/* ===================================================================
   SJ Flipbook CSS v3.0 — Side thumbnail rail, larger reading area
   =================================================================== */
.sj-flipbook {
  --fb-primary:  #1e40af;
  --fb-bg:       #1a1a2e;
  --fb-toolbar:  #12122a;
  --fb-page-bg:  #f8f6f0;
  --fb-spine:    #c8b87a;
  font-family: 'Inter', system-ui, sans-serif;
  width: 100%;
}

/* ── Outer wrap ─────────────────────────────────────────── */
.sj-fb-wrap {
  background: var(--fb-bg);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
}

/* ── Toolbar ────────────────────────────────────────────── */
.sj-fb-toolbar {
  background: var(--fb-toolbar);
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 18px; gap: 10px; flex-wrap: wrap;
}
.sj-fb-toolbar-left, .sj-fb-toolbar-right { display: flex; align-items: center; gap: 8px; }
.sj-fb-btn {
  background: rgba(255,255,255,.1); color: #d1d5db;
  border: 1px solid rgba(255,255,255,.15); border-radius: 6px;
  padding: 6px 10px; cursor: pointer; font-size: .82rem; font-weight: 600;
  line-height: 1; display: flex; align-items: center; justify-content: center;
  transition: background .15s, color .15s; font-family: inherit;
  min-width: 34px; min-height: 34px;
}
.sj-fb-btn:hover:not(:disabled) { background: rgba(255,255,255,.22); color: #fff; }
.sj-fb-btn:disabled { opacity: .3; cursor: not-allowed; }
.sj-fb-page-info  { color: #9ca3af; font-size: .82rem; white-space: nowrap; }
.sj-fb-zoom-label { color: #9ca3af; font-size: .78rem; min-width: 42px; text-align: center; }
.sj-fb-view-toggle svg { display: block; }
.sj-fb-btn-active {
  background: var(--fb-primary) !important;
  color: #fff !important;
  border-color: var(--fb-primary) !important;
}

/* ═══════════════════════════════════════════════════════════════
   BODY — thumbnail rail (left) + stage (right), side by side
═══════════════════════════════════════════════════════════════ */
.sj-fb-body {
  display: flex;
  align-items: stretch;
  height: 80vh;
  max-height: 900px;
  min-height: 420px;
}

/* ── Thumbnail rail (collapsible, hidden by default) ───────── */
.sj-fb-thumbs-rail {
  flex: 0 0 0px;
  width: 0;
  background: rgba(0,0,0,.3);
  border-right: 1px solid transparent;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0;
  transition: flex-basis .2s ease, width .2s ease, padding .2s ease;
}
.sj-fb-thumbs-rail.sj-fb-rail-open {
  flex: 0 0 76px;
  width: 76px;
  border-right-color: rgba(255,255,255,.07);
  padding: 10px 0;
}
.sj-fb-thumbs-rail::-webkit-scrollbar { width: 3px; }
.sj-fb-thumbs-rail::-webkit-scrollbar-track { background: transparent; }
.sj-fb-thumbs-rail::-webkit-scrollbar-thumb { background: rgba(255,255,255,.18); border-radius: 2px; }

.sj-fb-thumbs {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 0 8px;
}

.sj-fb-thumb {
  flex-shrink: 0;
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 4px;
  overflow: hidden;
  opacity: .5;
  transition: opacity .15s, border-color .15s, transform .15s;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}
.sj-fb-thumb:hover        { opacity: .85; transform: translateX(2px); }
.sj-fb-thumb-active       { border-color: var(--fb-primary); opacity: 1; }
.sj-fb-thumb canvas       { display: block; width: 100%; height: auto; }
.sj-fb-thumb span         { color: #9ca3af; font-size: .58rem; padding: 2px 0; }
.sj-fb-thumb-active span  { color: #fff; font-weight: 700; }

/* ── Stage (book area) — now takes remaining width ─────────── */
.sj-fb-stage {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px 24px;
  background: var(--fb-bg);
  position: relative;
}

/* ── Book ───────────────────────────────────────────────── */
.sj-fb-book {
  position: relative;
  display: flex;
  filter: drop-shadow(0 20px 40px rgba(0,0,0,.7));
}

/* ── Pages ──────────────────────────────────────────────── */
.sj-fb-page {
  position: relative;
  overflow: hidden;
  width: 50%;
  height: 100%;
  background: var(--fb-page-bg);
  display: flex;
  align-items: flex-start;
  justify-content: center;
}
.sj-fb-page-l {
  border-radius: 3px 0 0 3px;
  background: linear-gradient(to right, #ede8df 0%, var(--fb-page-bg) 100%);
  border-right: 1px solid rgba(0,0,0,.1);
}
.sj-fb-page-r {
  border-radius: 0 3px 3px 0;
  background: linear-gradient(to left, #ede8df 0%, var(--fb-page-bg) 100%);
  border-left: 1px solid rgba(0,0,0,.1);
}

.sj-fb-canvas-l, .sj-fb-canvas-r { display: block; max-width: 100%; }

.sj-fb-page-num {
  position: absolute; bottom: 6px;
  font-size: .65rem; color: #aaa; font-family: Georgia, serif;
  pointer-events: none;
}
.sj-fb-page-num-l { left: 10px; }
.sj-fb-page-num-r { right: 10px; }

/* ── Spine ──────────────────────────────────────────────── */
.sj-fb-spine {
  position: absolute; left: 50%; top: 0; bottom: 0;
  width: 8px; transform: translateX(-50%);
  background: linear-gradient(to right,
    rgba(0,0,0,.15) 0%, var(--fb-spine) 25%,
    #e8d88a 50%, var(--fb-spine) 75%, rgba(0,0,0,.18) 100%);
  z-index: 10; pointer-events: none;
}

/* ── Shadow pages (decorative depth) ───────────────────── */
.sj-fb-shadow {
  position: absolute; top: 2px; height: 100%; width: 48%;
  border-radius: 3px; pointer-events: none; z-index: 0;
}
.sj-fb-shadow-l { left: -3px;  background: rgba(0,0,0,.22); transform: skewY(-.4deg); }
.sj-fb-shadow-r { right: -3px; background: rgba(0,0,0,.22); transform: skewY(.4deg);  }

/* ── Click zones ────────────────────────────────────────── */
.sj-fb-click-l, .sj-fb-click-r {
  position: absolute; top: 0; height: 100%; width: 35%;
  z-index: 20; cursor: pointer; opacity: 0; transition: opacity .2s;
}
.sj-fb-click-l { left: 0; }
.sj-fb-click-r { right: 0; }
.sj-fb-click-l:hover, .sj-fb-click-r:hover { opacity: 1; }
.sj-fb-click-l::after, .sj-fb-click-r::after {
  content: ''; position: absolute; top: 50%; transform: translateY(-50%);
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(255,255,255,.15); backdrop-filter: blur(3px);
}
.sj-fb-click-l::after { left: 10px;  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='white' stroke-width='2.5' viewBox='0 0 24 24'%3E%3Cpolyline points='15 18 9 12 15 6'/%3E%3C/svg%3E"); background-repeat:no-repeat;background-position:center; }
.sj-fb-click-r::after { right: 10px; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='white' stroke-width='2.5' viewBox='0 0 24 24'%3E%3Cpolyline points='9 18 15 12 9 6'/%3E%3C/svg%3E"); background-repeat:no-repeat;background-position:center; }

/* ── Flip layer ─────────────────────────────────────────── */
.sj-fb-flip-layer {
  position: absolute; top: 0; height: 100%; width: 50%;
  z-index: 30; pointer-events: none;
  transform-style: preserve-3d;
  perspective: 1800px;
}
.sj-fb-flip-fwd { right: 0; transform-origin: left center; }
.sj-fb-flip-bwd { left:  0; transform-origin: right center; }

.sj-fb-flip-front,
.sj-fb-flip-back {
  position: absolute; inset: 0; overflow: hidden;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  background: var(--fb-page-bg);
  display: flex; align-items: flex-start; justify-content: center;
}
.sj-fb-flip-back { transform: rotateY(180deg); }

.sj-fb-flip-front canvas,
.sj-fb-flip-back  canvas { display: block; max-width: 100%; }

@keyframes sj-flip-fwd {
  0%   { transform: rotateY(0deg);    }
  100% { transform: rotateY(-180deg); }
}
@keyframes sj-flip-bwd {
  0%   { transform: rotateY(0deg);   }
  100% { transform: rotateY(180deg); }
}

/* ── Loading overlay ────────────────────────────────────── */
.sj-fb-loading {
  position: absolute; inset: 0;
  background: rgba(26,26,46,.92);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 14px; color: #9ca3af; font-size: .875rem; z-index: 50;
}
.sj-fb-spinner {
  width: 38px; height: 38px;
  border: 3px solid rgba(255,255,255,.1);
  border-top-color: var(--fb-primary);
  border-radius: 50%; animation: sj-fb-spin .7s linear infinite;
}
@keyframes sj-fb-spin { to { transform: rotate(360deg); } }

/* ── Single-page mode (forced via JS class OR narrow screen) ─── */
.sj-fb-book.sj-fb-mode-single .sj-fb-page-l { display: none; }
.sj-fb-book.sj-fb-mode-single .sj-fb-page-r { width: 100%; border-radius: 3px; }
.sj-fb-book.sj-fb-mode-single .sj-fb-spine,
.sj-fb-book.sj-fb-mode-single .sj-fb-shadow { display: none; }
.sj-fb-book.sj-fb-mode-single .sj-fb-flip-layer { display: none !important; }

/* ── Mobile: thumbnail rail unavailable, single-page only ───── */
@media (max-width: 599px) {
  .sj-fb-thumbs-toggle { display: none; }
  .sj-fb-page-l  { display: none; }
  .sj-fb-page-r  { width: 100%; border-radius: 3px; }
  .sj-fb-spine   { display: none; }
  .sj-fb-shadow  { display: none; }
  .sj-fb-flip-layer { display: none !important; }
  .sj-fb-stage { padding: 16px 12px; }
}

/* ── Fullscreen ─────────────────────────────────────────────── */
.sj-fb-wrap:fullscreen,
.sj-fb-wrap:-webkit-full-screen {
  border-radius: 0; display: flex; flex-direction: column;
}
.sj-fb-wrap:fullscreen .sj-fb-body,
.sj-fb-wrap:-webkit-full-screen .sj-fb-body {
  flex: 1;
}
.sj-fb-wrap:fullscreen .sj-fb-stage,
.sj-fb-wrap:-webkit-full-screen .sj-fb-stage {
  padding: 20px;
}

/* ── Open button (on article page) ─────────────────────── */
.sj-flipbook-trigger {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: 8px;
  background: var(--art-primary, #1e40af); color: #fff;
  font-size: .88rem; font-weight: 700; cursor: pointer;
  border: none; font-family: inherit; transition: filter .15s;
}
.sj-flipbook-trigger:hover { filter: brightness(1.1); }