/* =============================================
   LIBROS PAGE
   assets/css/libros.css
   ============================================= */

.section-libros { background:var(--c-bg-alt); }
.section-libros-dark { background:var(--c-navy); }

/* Author bio block */
.autor-bio {
  display:grid; grid-template-columns:1fr 2fr;
  gap:4rem; align-items:start;
  margin-bottom:5rem;
}
.autor-bio-label {
  font-family:var(--ff-serif); font-size:1.6rem;
  font-weight:700; color:var(--c-navy);
  line-height:1.2;
}
.autor-bio-role {
  font-style:italic; color:var(--c-gold);
}
.autor-bio-text p {
  font-size:1.03rem; color:var(--c-text-soft);
  line-height:1.8; margin-bottom:1rem;
}
.autor-bio-text strong { color:var(--c-text); }

/* Divider ornament */
.ornament-divider {
  text-align:center; margin:4rem 0;
  display:flex; align-items:center; gap:1.5rem;
}
.ornament-divider::before,
.ornament-divider::after {
  content:''; flex:1; height:1px; background:var(--c-border);
}
.ornament-symbol {
  color:var(--c-gold); font-size:1.5rem; font-family:var(--ff-serif);
  flex-shrink:0;
}

/* Book info header */
.book-header {
  display:grid; grid-template-columns:1fr 2fr;
  gap:4rem; align-items:start; margin-bottom:3.5rem;
}
.book-header-meta {}
.book-header-meta h2 {
  font-family:var(--ff-serif); font-size:2.2rem;
  font-weight:700; color:var(--c-navy); line-height:1.15;
  margin-bottom:.5rem;
}
.book-edition {
  font-style:italic; color:var(--c-gold);
  font-size:1.1rem; font-family:var(--ff-serif);
  display:block; margin-bottom:1.25rem;
}
.book-tags { display:flex; flex-wrap:wrap; gap:.5rem; margin-bottom:1.5rem; }
.book-tag {
  font-size:.72rem; font-weight:700; letter-spacing:.1em;
  text-transform:uppercase; padding:.3rem .7rem;
  border:1.5px solid var(--c-border); border-radius:100px;
  color:var(--c-text-soft);
}
.book-header-desc p {
  font-size:1rem; color:var(--c-text-soft); line-height:1.8; margin-bottom:1rem;
}
.book-header-desc p strong { color:var(--c-text); }

/* Buy buttons row */
.buy-row {
  display:flex; flex-wrap:wrap; gap:.85rem; margin-top:1.75rem;
}
.btn-amazon {
  background:var(--c-gold); color:var(--c-navy); border-color:var(--c-gold);
  font-size:.95rem; padding:.9rem 1.8rem;
}
.btn-amazon:hover {
  background:var(--c-gold-light); border-color:var(--c-gold-light);
  transform:translateY(-2px); box-shadow:0 6px 20px rgba(201,168,76,.4);
}
.btn-store {
  background:transparent; color:var(--c-text);
  border:1.5px solid var(--c-border);
  font-size:.82rem; padding:.65rem 1.2rem;
  border-radius:var(--radius);
  transition:all var(--t);
}
.btn-store:hover {
  border-color:var(--c-navy); color:var(--c-navy);
  background:rgba(13,27,42,.04);
}

/* ============================================
   BOOK VIEWER (3D Flip)
   ============================================ */
.book-viewer-section {
  background: var(--c-navy);
  padding: 64px 0;
  margin-top: 5rem;
  overflow-x: hidden;
}
.book-viewer-section-inner {
  text-align: center;
  overflow: visible;
}
.book-viewer-section-inner h2 {
  font-family:var(--ff-serif); font-size:1.4rem; font-weight:700;
  color:rgba(255,255,255,.6); margin-bottom:2.5rem;
  letter-spacing:.05em;
}

.book-viewer-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  padding: 0 1rem;
  -webkit-overflow-scrolling: touch;
}

.book-viewer {
  perspective: 2400px;
  width: 760px;
  height: 540px;
  min-width: 280px;
  position: relative;
  cursor: pointer;
  flex-shrink: 0;
}

/* Spine — horizontal centre of the viewer */
.book-viewer::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 380px;
  width: 18px;
  background: linear-gradient(to right, #05090e, #0d1b2a);
  border-radius: 4px 0 0 4px;
  z-index: 20;
  box-shadow: 2px 0 8px rgba(0, 0, 0, .5);
}

/* Each leaf — occupies the RIGHT half (unread pages) */
.book-leaf {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 380px;
  right: 0;
  transform-style: preserve-3d;
  transform-origin: left center;
  transition: transform 1s cubic-bezier(.645, .045, .355, 1);
  border-radius: 0 8px 8px 0;
  box-shadow: var(--shadow-lg);
}
/* Flipped leaves sweep to the LEFT half */
.book-leaf.is-flipped { transform:rotateY(-180deg); }

/* Each face */
.book-page {
  position:absolute; inset:0;
  backface-visibility:hidden; -webkit-backface-visibility:hidden;
  border-radius:0 8px 8px 0; overflow:hidden;
}
.page-front { transform:rotateY(0deg); z-index:2; }
.page-back  { transform:rotateY(180deg); z-index:1; }

/* Cover */
.page-cover {
  background:var(--c-navy);
  display:flex; align-items:center; justify-content:center;
}
.cover-inner {
  margin:18px 12px 12px 20px; height:calc(100% - 30px);
  border:1px solid rgba(201,168,76,.25); border-radius:4px;
  display:flex; flex-direction:column;
  align-items:center; justify-content:center;
  gap:.8rem; padding:2rem 2.25rem; text-align:center;
}
.cover-compass { width:90px; height:90px; }
.cover-main-title {
  font-family:var(--ff-serif); font-size:1.45rem;
  font-weight:700; color:var(--c-white); line-height:1.2;
}
.cover-sub-title {
  font-family:var(--ff-serif); font-style:italic;
  font-size:.82rem; color:var(--c-gold); letter-spacing:.02em;
}
.cover-line { width:40px; height:1px; background:var(--c-gold); }
.cover-author-name {
  font-size:.72rem; font-weight:700;
  letter-spacing:.2em; text-transform:uppercase;
  color:rgba(255,255,255,.45);
}

/* Interior pages */
.page-interior { background:#fffef8; }

.page-content {
  padding:2.5rem 2rem 2rem 2.5rem;
  height:100%; overflow:hidden; position:relative;
}
.page-num {
  font-family:var(--ff-serif); font-size:.7rem;
  color:var(--c-gold); letter-spacing:.15em; text-transform:uppercase;
  display:block; margin-bottom:1.25rem;
}
.page-content h3 {
  font-family:var(--ff-serif); font-size:1.25rem;
  font-weight:700; color:var(--c-navy);
  margin-bottom:1rem; line-height:1.25;
}
.page-content p {
  font-size:.82rem; color:#4a3f30;
  line-height:1.72; margin-bottom:.85rem;
}
.page-content blockquote {
  font-family:var(--ff-serif); font-style:italic;
  font-size:.88rem; color:var(--c-gold);
  border-left:2px solid var(--c-gold);
  padding-left:1rem; margin:1rem 0; line-height:1.55;
}
.page-ornament { margin:.8rem 0; }

/* Back cover */
.page-backcover {
  background:var(--c-navy);
}
.backcover-inner {
  padding:2rem 2rem 2rem 2.25rem;
  height:100%; display:flex;
  flex-direction:column; justify-content:space-between; gap:1rem;
}
.backcover-quote {
  font-family:var(--ff-serif); font-style:italic;
  font-size:.86rem; color:rgba(255,255,255,.6);
  border-top:1px solid rgba(201,168,76,.3);
  border-bottom:1px solid rgba(201,168,76,.3);
  padding:.85rem 0; line-height:1.6;
}
.backcover-summary h3 {
  font-family:var(--ff-serif); font-size:.9rem;
  font-weight:700; color:var(--c-gold); margin-bottom:.4rem;
}
.backcover-summary p {
  font-size:.76rem; color:rgba(255,255,255,.55); line-height:1.6;
}
.backcover-buy-area {
  display:flex; flex-direction:column; gap:.7rem;
}
.btn-buy-back {
  display:inline-flex; align-items:center; gap:.5rem;
  font-size:.82rem; font-weight:700; letter-spacing:.04em;
  background:var(--c-gold); color:var(--c-navy);
  padding:.7rem 1.1rem; border-radius:4px;
  border:none; cursor:pointer; transition:background var(--t);
  text-decoration:none; align-self:flex-start;
}
.btn-buy-back:hover { background:var(--c-gold-light); }
.backcover-stores {
  display:flex; gap:.4rem; flex-wrap:wrap;
}
.store-pill {
  font-size:.68rem; font-weight:700;
  color:rgba(255,255,255,.4);
  border:1px solid rgba(255,255,255,.15);
  padding:.22rem .55rem; border-radius:3px;
  transition:all var(--t); text-decoration:none;
  letter-spacing:.04em;
}
.store-pill:hover { color:var(--c-gold); border-color:var(--c-gold); }
.backcover-by {
  font-size:.68rem; font-weight:700;
  letter-spacing:.16em; text-transform:uppercase;
  color:rgba(255,255,255,.25); text-align:right;
}

/* Book controls */
.book-controls {
  display:flex; align-items:center; gap:1.5rem;
}
.book-btn {
  display:inline-flex; align-items:center; gap:.4rem;
  font-family:var(--ff-sans); font-size:.82rem; font-weight:700;
  letter-spacing:.06em; color:rgba(255,255,255,.7);
  background:rgba(255,255,255,.07);
  border:1.5px solid rgba(255,255,255,.18);
  border-radius:var(--radius); padding:.6rem 1.1rem;
  cursor:pointer; transition:all var(--t);
}
.book-btn svg { width:15px; height:15px; }
.book-btn:hover:not(:disabled) {
  border-color:var(--c-gold); color:var(--c-gold);
  background:rgba(201,168,76,.1);
}
.book-btn:disabled { opacity:.3; cursor:not-allowed; }
.book-page-indicator {
  font-family:var(--ff-serif); font-style:italic;
  font-size:.88rem; color:rgba(255,255,255,.45);
  min-width:120px; text-align:center;
}

/* Hint text */
.book-hint {
  font-size:.75rem; color:rgba(255,255,255,.3);
  letter-spacing:.06em;
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .autor-bio { grid-template-columns: 1fr; gap: 2rem; }
  .book-header { grid-template-columns: 1fr; gap: 2rem; }
}

/* Tablet: viewer 520px */
@media (max-width: 640px) {
  .book-viewer-section { padding: 48px 0; }
  .book-viewer-wrap { padding: 0 0.75rem; gap: 1.5rem; }
  .book-viewer { width: 520px; height: 415px; }
  .book-viewer::before { left: 260px; width: 14px; }
  .book-leaf { left: 260px; }
  .cover-inner { padding: 1.5rem 1.25rem; margin: 14px 10px 10px 16px; }
  .cover-compass { width: 68px; height: 68px; }
  .cover-main-title { font-size: 1.15rem; }
  .page-content { padding: 1.75rem 1.5rem 1.5rem 1.75rem; }
  .page-content h3 { font-size: 1.1rem; }
  .page-content p { font-size: 0.78rem; }
  .backcover-inner { padding: 1.75rem 1.5rem 1.5rem 1.75rem; }
  .backcover-quote { font-size: 0.8rem; }
  .buy-row { flex-direction: column; }
  .book-controls { flex-wrap: wrap; justify-content: center; gap: 1rem; }
  .book-btn { padding: 0.55rem 0.9rem; font-size: 0.78rem; }
}

/* Mobile: viewer 340px — cabe en pantallas 360px+ */
@media (max-width: 480px) {
  .book-viewer-section { padding: 40px 0; }
  .book-viewer-section-inner h2 { font-size: 1.2rem; margin-bottom: 1.5rem; }
  .book-viewer-wrap { padding: 0 0.75rem; gap: 1.25rem; }
  .book-viewer { width: 340px; height: 272px; }
  .book-viewer::before { left: 170px; width: 12px; }
  .book-leaf { left: 170px; right: 0; }
  .cover-inner { padding: 1rem 0.85rem; margin: 10px 8px 8px 12px; gap: 0.5rem; }
  .cover-compass { width: 52px; height: 52px; }
  .cover-main-title { font-size: 1rem; line-height: 1.15; }
  .cover-sub-title { font-size: 0.72rem; }
  .cover-author-name { font-size: 0.65rem; }
  .page-content { padding: 1.25rem 1rem 1rem 1.25rem; }
  .page-num { font-size: 0.65rem; margin-bottom: 0.75rem; }
  .page-content h3 { font-size: 1rem; margin-bottom: 0.6rem; }
  .page-content p { font-size: 0.72rem; line-height: 1.6; margin-bottom: 0.6rem; }
  .page-content blockquote { font-size: 0.78rem; padding-left: 0.75rem; }
  .backcover-inner { padding: 1.25rem 1rem 1rem 1.25rem; gap: 0.75rem; }
  .backcover-quote { font-size: 0.72rem; padding: 0.6rem 0; }
  .backcover-summary h3 { font-size: 0.82rem; }
  .backcover-summary p { font-size: 0.68rem; }
  .btn-buy-back { font-size: 0.75rem; padding: 0.6rem 0.9rem; }
  .store-pill { font-size: 0.6rem; padding: 0.18rem 0.45rem; }
  .book-controls { flex-direction: column; gap: 0.75rem; }
  .book-page-indicator { min-width: auto; font-size: 0.8rem; }
  .book-hint { font-size: 0.7rem; text-align: center; }
}

/* Móvil muy estrecho: escalar para que quepa sin overflow */
@media (max-width: 380px) {
  .book-viewer-wrap {
    transform: scale(calc((100vw - 2rem) / 340));
    transform-origin: top center;
  }
  .book-viewer { width: 340px; height: 272px; }
  .book-viewer::before { left: 170px; width: 12px; }
  .book-leaf { left: 170px; right: 0; }
  .cover-inner { padding: 0.75rem 0.6rem; margin: 8px 6px 6px 10px; gap: 0.35rem; }
  .cover-compass { width: 42px; height: 42px; }
  .cover-main-title { font-size: 0.88rem; }
  .page-content { padding: 1rem 0.85rem 0.85rem 1rem; }
  .page-content h3 { font-size: 0.9rem; }
  .page-content p { font-size: 0.68rem; }
}