/* ============================================================
   DIMP Book Flip v1.0 — Frontend Styles
   ============================================================ */

/* ── Wrapper ── */
.dimp-bf-wrapper {
  position: relative;
  width: 100%;
  overflow: visible;
}

/* ── Sticky Canvas ── */
.dimp-bf-canvas-wrap {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  background: #1a1008;
  z-index: 1;
}

.dimp-bf-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ── Scroll Space ── */
.dimp-bf-scroll-space {
  position: relative;
  width: 100%;
  pointer-events: none;
  margin-top: -100vh;
  z-index: 0;
}

/* ── Preloader ── */
.dimp-bf-preloader {
  position: absolute;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1a1008;
  color: #e8dfc8;
  transition: opacity .7s ease, visibility .7s ease;
}
.dimp-bf-preloader.is-done {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.dimp-bf-preloader-inner { text-align: center; }
.dimp-bf-preloader-bar {
  width: 180px;
  height: 3px;
  background: rgba(232,223,200,.2);
  border-radius: 3px;
  overflow: hidden;
  margin: 0 auto 1rem;
}
.dimp-bf-preloader-fill {
  height: 100%;
  width: 0;
  background: #8b4513;
  border-radius: 3px;
  transition: width .25s ease;
}
.dimp-bf-preloader-text {
  font-size: .8rem;
  opacity: .6;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin: 0;
  font-family: Georgia, serif;
}

/* ── Overlay UI ── */
.dimp-bf-ui {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 10;
}

/* ── Progress Bar ── */
.dimp-bf-progress {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: .8rem;
  pointer-events: none;
}
.dimp-bf-progress-track {
  width: 160px;
  height: 2px;
  background: rgba(232,223,200,.2);
  border-radius: 2px;
  overflow: hidden;
}
.dimp-bf-progress-fill {
  height: 100%;
  width: 0;
  background: #8b4513;
  border-radius: 2px;
  transition: width .15s ease;
}
.dimp-bf-page-counter {
  font-size: .75rem;
  color: rgba(232,223,200,.6);
  font-family: Georgia, serif;
  letter-spacing: .08em;
  white-space: nowrap;
}

/* ── Navigation Arrows ── */
.dimp-bf-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0,0,0,.35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(232,223,200,.15);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  color: rgba(232,223,200,.8);
  font-size: 1.1rem;
  cursor: pointer;
  pointer-events: all;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .2s, color .2s, opacity .3s;
  opacity: 0.7;
}
.dimp-bf-nav:hover { background: rgba(139,69,19,.5); opacity: 1; }
.dimp-bf-nav--prev { left: 1.2rem; }
.dimp-bf-nav--next { right: 1.2rem; }
.dimp-bf-nav:disabled { opacity: .2; cursor: default; pointer-events: none; }

/* ── Page Label ── */
.dimp-bf-page-label {
  position: absolute;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity .4s ease;
}
.dimp-bf-page-label.is-visible { opacity: 1; }
.dimp-bf-page-title {
  display: block;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: clamp(.9rem, 2vw, 1.3rem);
  color: rgba(232,223,200,.85);
  letter-spacing: .08em;
  text-shadow: 0 2px 12px rgba(0,0,0,.8);
}

/* ── Mobile ── */
@media (max-width: 768px) {
  .dimp-bf-nav { width: 36px; height: 36px; font-size: .9rem; }
  .dimp-bf-progress-track { width: 100px; }
}

@media (prefers-reduced-motion: reduce) {
  .dimp-bf-preloader,
  .dimp-bf-progress-fill,
  .dimp-bf-page-label { transition: none; }
}