:root{
    --la-primary:#76C925;
    --la-primary-dark:#5ea01d;
    --la-dark:#333;
    --la-white:#fff;
    --flip-time:1.45s;
    --flip-ease:cubic-bezier(.22,.03,.15,1);
    }
    .la-main{flex:0 0 auto;}
    /* ------- Título centrado ------- */
    #lab-current-title{
      text-align:center;
      padding:1.5rem 1rem .5rem;
    }
    #lab-current-title h2{
      margin:0;
      font-size:clamp(1.4rem,3vw,2rem);
      font-weight:700;
      color:var(--la-primary-dark);
    }
    /* ------- Selector ------- */
    #book-selector{
      display:grid;
      grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
      gap:1.5rem;
      padding:2rem 1rem 1.5rem;
      max-width:960px;
      margin:0 auto;
    }
    .la-book-card{
      background:var(--la-white);
      border:1px solid #dedede;
      border-radius:.75rem;
      overflow:hidden;
      cursor:pointer;
      transition:transform .25s,box-shadow .25s;
      display:flex;
      flex-direction:column;
    }
    .la-book-card img{width:100%;display:block;}
    .la-book-card:hover{transform:translateY(-4px);box-shadow:0 6px 12px rgba(0,0,0,.08);}
    .la-book-info{padding:1rem;text-align:center;}
    .la-book-info h3{margin:0 0 .25rem;font-size:1.1rem;color:var(--la-dark);}
    .la-book-info span{font-size:.85rem;color:var(--la-primary-dark);}

    /* ------- Visor ------- */
    .la-book-wrapper{
      display:none;
      flex-direction:column;
      align-items:center;
      padding:1.5rem 0 2rem;
      background:linear-gradient(150deg,#fdfdfd 0%,#f0f0f0 100%);
      border-top:1px solid #dedede;
    }
    .la-book-wrapper.is-visible{display:flex;}
    .viewer-shell{
      width:100%;
      max-width:1300px;
      margin:0 auto;
      padding:0 1rem;
    }
    .la-viewer-header{
      display:flex;
      justify-content:space-between;
      align-items:center;
      margin-bottom:1rem;
      gap:.75rem;
    }
    .la-title-mini{
      margin:0;
      font-size:1rem;
      font-weight:600;
      color:var(--la-dark);
      text-overflow:ellipsis;
      white-space:nowrap;
      overflow:hidden;
      max-width:70%;
    }
    .la-actions{display:flex;gap:.5rem;flex-wrap:wrap;}
    .la-book-btn{
      background:var(--la-primary);
      color:#fff;
      border:none;
      padding:.55rem 1.1rem;
      border-radius:.45rem;
      cursor:pointer;
      font-size:.92rem;
      transition:opacity .2s;
      text-decoration:none;
      display:inline-flex;
      align-items:center;
      gap:.3rem;
    }
    .la-book-btn:hover{opacity:.9;color:#fff;}
    .la-download{background:var(--la-primary-dark);}

    .la-book-container{
      display:flex;
      justify-content:center;
    }
    .la-book-pages{
      position:relative;
      display:flex;
      gap:12px;
      perspective:1200px;
    }
    .la-page{
      width:calc(50vw - 24px);
      max-width:560px;
      aspect-ratio:3/4;
      background:#fff;
      border-radius:8px;
      overflow:hidden;
      box-shadow:0 8px 24px rgba(0,0,0,.15);
      transform-style:preserve-3d;
      backface-visibility:hidden;
    }
    .la-page.blank{background:transparent;box-shadow:none;}
    .la-page canvas{width:100%;height:auto;display:block;}
    .la-book-pages::before{
      content:"";
      position:absolute;top:0;bottom:0;left:50%;
      width:2px;background:rgba(0,0,0,.08);box-shadow:0 0 14px rgba(0,0,0,.12);
      transform:translateX(-50%);pointer-events:none;
    }
    .la-flip-wrapper{
      z-index:0;position:absolute;top:0;bottom:0;width:50%;pointer-events:none;perspective:1600px;
    }
    .la-flip-wrapper.right{right:0;transform-origin:left center;}
    .la-flip-wrapper.left{left:0;transform-origin:right center;}
    .la-flip-page{
      position:absolute;inset:0;background:#fff;box-shadow:0 6px 16px rgba(0,0,0,.25);
      backface-visibility:hidden;overflow:hidden;
    }
    .la-flip-page::before{
      content:"";position:absolute;inset:0;
      background:linear-gradient(90deg,rgba(0,0,0,.25),rgba(0,0,0,0) 70%);
      mix-blend-mode:multiply;opacity:.55;
    }
    .la-nav{
      margin-top:1rem;
      display:flex;
      align-items:center;
      gap:1rem;
      justify-content:center;
    }
    #lab-page-info{font-weight:600;color:var(--la-dark);}
    @media(max-width:768px){
      .la-book-pages{flex-direction:column;align-items:center;}
      .la-page{width:90vw;max-width:480px;margin:0 0 12px;}
      .la-title-mini{max-width:55%;}
    }
/* ---------- Página hacia adelante ---------- */
    @keyframes pageTurnNext{
    0%   { transform:rotateY(0deg);                  filter:brightness(1); }
    8%   { transform:rotateY(-12deg) translateX(-1px); }
    45%  { transform:rotateY(-92deg);               filter:brightness(.92); }
    70%  { transform:rotateY(-150deg);              filter:brightness(.98); }
    100% { transform:rotateY(-180deg);              filter:brightness(1); }
    }

    /* ---------- Página hacia atrás ---------- */
    @keyframes pageTurnPrev{
    0%   { transform:rotateY(-180deg);              filter:brightness(1); }
    30%  { transform:rotateY(-120deg);              filter:brightness(.92); }
    55%  { transform:rotateY(-70deg) translateX(1px); }
    92%  { transform:rotateY(-8deg);                filter:brightness(1); }
    100% { transform:rotateY(0deg);                 filter:brightness(1); }
    }

    /* sombreado simple y sincronizado */
    .la-flip-page::before{
    animation:flipShade var(--flip-time) var(--flip-ease) both;
    }
    @keyframes flipShade{
    0%   {opacity:.10; transform:translateX(0);}
    50%  {opacity:.45; transform:translateX(28%);}
    100% {opacity:.08; transform:translateX(55%);}
    }