/* Sección "Libros que me formaron" (estantería 3D, variante 3). La inserta libros.js. */
.libros{--ink:#111;--muted:#6f6f78;--green:#2fb344;--ease:cubic-bezier(.2,.8,.2,1);position:relative;background:linear-gradient(#fff 0,#f5f5f7 22%,#e9eaee 50%,#f5f5f7 78%,#fff 100%);color:#111;padding:96px 24px 110px;overflow:hidden;font-family:Geist,system-ui,sans-serif}
.libros *{box-sizing:border-box}
.libros .wrap{max-width:1100px;margin:0 auto;text-align:center}
.libros .eyebrow{display:inline-flex;align-items:center;gap:10px;font:800 13px Doto,monospace;font-variation-settings:"ROND" 70;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.libros .dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--green)}
.libros .t{margin:14px 0 0;font-weight:500;font-size:clamp(2rem,4.6vw,3.4rem);line-height:1.05;letter-spacing:-.045em;color:#111}
.libros .sub{margin:12px auto 0;max-width:520px;color:var(--muted);line-height:1.5}
.libros .stage{overflow:visible}
.libros .stage::-webkit-scrollbar{display:none}
@media(max-width:900px){.libros .stage{overflow-x:auto;scrollbar-width:none}.libros .shelf{justify-content:flex-start}}
.libros .stage{perspective:1400px;margin-top:56px}
.libros .shelf{display:flex;align-items:flex-end;justify-content:center;gap:0;padding-inline:20px}
.libros .slot{position:relative;-webkit-tap-highlight-color:transparent;flex:none;width:var(--t);height:var(--h);transform-style:preserve-3d;transition:width .55s var(--ease);cursor:pointer}
.libros .b3{pointer-events:none;position:absolute;left:50%;top:0;width:var(--w);height:var(--h);margin-left:calc(var(--w)/-2);transform-style:preserve-3d;transform:rotateY(90deg);transition:transform .65s var(--ease)}
.libros .f{position:absolute;backface-visibility:hidden;overflow:hidden}
.libros .cover{inset:0;transform:translateZ(calc(var(--t)/2));border-radius:3px 7px 7px 3px;background:linear-gradient(115deg,#0003 0 3%,#fff3 4%,#0000 7%),var(--c);color:var(--k);padding:22px 20px;display:flex;flex-direction:column;justify-content:space-between;text-align:left;box-shadow:inset 0 0 0 1px #0001}
.libros .cover b{font:700 21px/1.05 GeistSans,system-ui,sans-serif;letter-spacing:-.04em}
.libros .cover small{font:500 11px var(--font-geist-mono,ui-monospace),monospace;letter-spacing:.06em;text-transform:uppercase;opacity:.75}
.libros .cover i{display:block;width:54px;height:54px;border-radius:50%;border:2px solid currentColor;opacity:.5}
.libros .back{inset:0;transform:rotateY(180deg) translateZ(calc(var(--t)/2));background:var(--c)}
.libros .spine{width:var(--t);height:100%;left:calc(50% - var(--t)/2);transform:rotateY(-90deg) translateZ(calc(var(--w)/2));background:linear-gradient(90deg,#0004,#fff2 18%,#0000 60%,#0003),var(--c);color:var(--k);display:grid;place-items:center}
.libros .spine span{writing-mode:vertical-rl;transform:rotate(180deg);font:600 14px GeistSans,system-ui,sans-serif;letter-spacing:-.01em;white-space:nowrap;padding:12px 0;max-height:100%;overflow:hidden}
.libros .spine em{position:absolute;left:0;right:0;height:6px;background:currentColor;opacity:.35}
.libros .spine em:first-child{top:16px}.spine em:last-child{bottom:16px}
.libros .spine.custom{background:none;display:block}.spine.custom svg{display:block;width:100%;height:100%}
.libros .pages{width:var(--t);height:100%;left:calc(50% - var(--t)/2);transform:rotateY(90deg) translateZ(calc(var(--w)/2));background:repeating-linear-gradient(0deg,#fff 0 2px,#e6e3da 2px 3px)}
.libros .board{height:16px;margin:0 auto;border-radius:3px;background:linear-gradient(#d9c7a8,#b79f78);box-shadow:0 18px 30px -10px #0004,inset 0 1px 0 #fff8}
.libros .board.thin{height:3px;background:var(--ink);box-shadow:none;border-radius:0}
.libros .slot:hover,.libros .slot.is-on,.libros .slot.is-hint{z-index:5}
.libros .slot:hover .b3,.libros .slot.is-on .b3,.libros .slot.is-hint .b3{transform:translateZ(150px) translateY(-14px) rotateY(-8deg)}
.libros .slot::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:12px;background:radial-gradient(ellipse at 50% 50%,#0006,#0000 70%);opacity:0;transition:opacity .4s;pointer-events:none}
.libros .slot:hover::after,.libros .slot.is-on::after,.libros .slot.is-hint::after{opacity:.8}

/* Estante de vidrio con reflejo */
.libros .shelf{position:relative;z-index:2;-webkit-box-reflect:below 2px linear-gradient(transparent 62%,#0004)}
.libros .board{position:relative;z-index:1;height:14px;width:min(1000px,100%);border-radius:3px;background:linear-gradient(#ffffffd9,#cfe6f2aa);border:1px solid #fff;box-shadow:0 0 0 1px #a8c4d633,0 10px 18px -6px #3d6a8855;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
@media(max-width:900px){.libros .shelf{-webkit-box-reflect:none}}

/* Sobrecubierta satinada: brillo estático en tapa y lomo (solo gradientes) */
.libros .cover::after,.libros .spine::after{content:"";position:absolute;inset:0;pointer-events:none}
.libros .cover::after{background:linear-gradient(112deg,#fff0 25%,#ffffff55 40%,#fff0 55%),linear-gradient(180deg,#ffffff30,#0000 30%,#0000 75%,#00000026)}
.libros .spine::after{background:linear-gradient(90deg,#fff0 10%,#ffffff6e 30%,#ffffff1a 42%,#fff0 55%),linear-gradient(180deg,#ffffff2e,#0000 22%,#0000 80%,#0000002e)}
.libros .cover{box-shadow:inset 0 0 0 1px #fff3,inset 2px 0 3px #fff4}

/* Rendimiento: sin cara trasera (nunca se ve), capas solo en el libro que se mueve */
.libros .back{display:none}
.libros .b3{will-change:transform}
.libros .f{backface-visibility:hidden}
@media(prefers-reduced-motion:reduce){.libros .b3{transition:none}}

/* Lomo genérico "limpio": sin bandas, borde de luz a la izquierda y sombra suave */
.libros .spine:not(.custom){border-radius:2px 2px 1px 1px;background:linear-gradient(90deg,#0003 0,#fff2 7%,#0000 22%,#0000 78%,#0002 100%),var(--c);box-shadow:inset 0 1px 0 #fff3}
.libros .spine:not(.custom) span{font-weight:500}

/* Estante de vidrio un poco más grande: más ancho y más grueso (solo computadora) */
@media(min-width:901px){.libros .board{height:22px;transform:scaleX(1.12);transform-origin:50% 0}}

/* Cursor fantasma de la pista inicial */
.libros .stage{position:relative}
.libros .ghost{position:absolute;z-index:20;left:0;top:0;pointer-events:none;opacity:0;transition:transform 1s cubic-bezier(.5,0,.2,1),opacity .4s}
.libros .ghost svg{filter:drop-shadow(0 4px 6px #0005)}
.libros .ghost i{position:absolute;left:-9px;top:-9px;width:26px;height:26px;border-radius:50%;border:2px solid #111;animation:libros-ring 1.2s infinite}
@keyframes libros-ring{0%{transform:scale(.4);opacity:.7}100%{transform:scale(1.5);opacity:0}}