/* ============================================================
   DIARY-FLIPBOOK
   A single turning leaf using a two-layer flip technique:
   #leafStatic always shows the page the flip is revealing;
   #leafFlip sits above it and rotates to reveal that page,
   then resets instantly once settled. See diary-flipbook.js.
   ============================================================ */

.flipbook-section {
  padding: var(--space-lg) 0 var(--space-xl);
}

/* ---- tabs ---- */

.flipbook-tabs {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  max-width: 900px;
  margin: 0 auto var(--space-lg);
  padding: 0 var(--space-md);
}

.flipbook-tab {
  padding: 0.6rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: background var(--dur-quick) var(--ease-soft),
              color var(--dur-quick) var(--ease-soft),
              border-color var(--dur-quick) var(--ease-soft);
}
.flipbook-tab.is-active,
.flipbook-tab:hover {
  background: var(--rose-deep);
  color: var(--parchment);
  border-color: var(--rose-deep);
}

/* ---- stage + fixed side arrows ---- */

.flipbook-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.flipbook-arrow {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 30;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass-fill);
  backdrop-filter: blur(6px);
  color: var(--rose-deep);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--dur-quick) var(--ease-soft),
              background var(--dur-quick) var(--ease-soft);
}
.flipbook-arrow:hover { transform: translateY(-50%) scale(1.08); }
.flipbook-arrow:disabled { opacity: 0.3; cursor: default; }
.flipbook-arrow:disabled:hover { transform: translateY(-50%); }

.flipbook-arrow-left { left: clamp(0.8rem, 3vw, 3rem); }
.flipbook-arrow-right { right: clamp(0.8rem, 3vw, 3rem); }

.flipbook-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

/* ---- the book itself ---- */

.flipbook-book {
  position: relative;
  width: min(92vw, 440px);
  height: min(75vh, 560px);
  perspective: 1800px;
  box-shadow: 0 24px 60px rgba(58,46,42,0.28);
  border-radius: var(--radius-card);
}

.leaf {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transform-origin: left center;
}
#leafStatic { z-index: 1; }
#leafFlip { z-index: 2; }

.leaf-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--parchment-deep);
  display: flex;
  flex-direction: column;
}

.leaf-back { transform: rotateY(180deg); }

.leaf.is-turning-next { transition: transform 0.85s var(--ease-soft); transform: rotateY(-180deg); }
.leaf.is-turning-prev { transition: transform 0.85s var(--ease-soft); transform: rotateY(180deg); }

/* ---- page content ---- */

.page-content {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.page-image-wrap { flex: 1; overflow: hidden; }
.page-image-wrap img { width: 100%; height: 100%; object-fit: cover; }

.page-text-wrap {
  flex: 1;
  padding: var(--space-md);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.page-text-wrap p {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--ink);
  line-height: 1.75;
}

.page-meta {
  padding: 0.7rem var(--space-md);
  border-top: 1px solid var(--line);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  background: rgba(255,255,255,0.4);
}

.page-counter {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

@media (max-width: 560px) {
  .flipbook-arrow { width: 38px; height: 38px; font-size: 0.95rem; }
}