/* ==========================================================================
   Flipbook Catalogue (flipbooks.html) and Flipbook Viewer (flipbook.html).
   Shares the catalogue chrome (.books-page, .books-toolbar, .books-grid,
   .books-empty, …) from css/books.css and the .book-card component from
   css/style.css — only flipbook-specific bits live here.
   ========================================================================== */

/* ---- Flipbook card: cover → subject → name → class → CTA ---- */
.flipbook-card { display: flex; }
.flipbook-card .book-card__body { padding-bottom: 18px; }

.flipbook-card__footer { width: 100%; margin-top: auto; padding-top: 12px; }

.flipbook-card__cta { padding-block: 12px; font-size: 0.92rem; }

.flipbook-card--clickable { cursor: pointer; }

/* ---- Flipbook Viewer page ---- */
.flipbook-viewer-page {
  padding-top: calc(var(--nav-h) + 40px);
  padding-bottom: clamp(60px, 8vw, 100px);
  background: linear-gradient(180deg, var(--bg-soft-purple), var(--bg) 55%);
  min-height: 70vh;
}

.flipbook-viewer__header { max-width: 820px; margin-bottom: 28px; }
.flipbook-viewer__meta { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.flipbook-viewer__header h1 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); }

.flipbook-viewer__stage {
  position: relative; width: 100%; min-height: 420px; aspect-ratio: 16 / 10;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  box-shadow: var(--shadow-md); overflow: hidden; display: flex;
}

.flipbook-viewer__iframe { width: 100%; height: 100%; border: none; display: block; }

.flipbook-viewer__message {
  margin: auto; text-align: center; padding: 40px 24px; max-width: 420px;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.flipbook-viewer__message h3 { font-size: 1.3rem; }
.flipbook-viewer__message p { color: var(--text-muted); }
.flipbook-viewer__message .btn { margin-top: 12px; }

@media (max-width: 600px) {
  .flipbook-viewer-page { padding-top: calc(var(--nav-h) + 24px); }
  .flipbook-viewer__stage { min-height: 320px; aspect-ratio: 4 / 5; border-radius: var(--r-md); }
}