/* Modo «Hojear» (flipbook) — piloto Memoria Institucional. Misma familia visual que .pdfmodal.
   Motor de hoja curvada (tiras anidadas) portado del sketchbook de ThreeUI, adaptado a páginas sueltas. */
.flipbtn{width:100%;margin-top:10px;background:#fff;color:var(--navy);border:2px solid var(--navy);border-radius:14px;padding:13px;font-family:Inter;font-weight:700;font-size:15px;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:9px;transition:background .2s var(--ease-out),color .2s,transform .12s}
.flipbtn:hover{background:var(--navy);color:#fff}.flipbtn:active{transform:scale(.98)}
.flipbtn svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.flipbtn + .dlbig{margin-top:10px}

.flipmodal{position:fixed;inset:0;z-index:9999;background:#0b1424;display:flex;flex-direction:column;color:#fff}
.admin-bar .flipmodal{top:32px}
.flipmodal[hidden]{display:none}
.flipmodal-head{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:14px;background:var(--navy);padding:11px 16px;flex:0 0 auto;border-bottom:1px solid rgba(255,255,255,.1);z-index:3}
.flipmodal-left{display:flex;align-items:center;gap:8px}
.flipmodal-center{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:0;line-height:1.2}
.flipmodal-right{display:flex;align-items:center;gap:8px;justify-content:flex-end}
.flipmodal-title{font-family:'Space Grotesk';font-weight:700;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:min(52vw,640px)}
.flipmodal-pages{font-size:12px;color:var(--sky);font-variant-numeric:tabular-nums}
.flipmodal-btn{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.1);color:#fff;border:0;border-radius:6px;font-family:Inter;font-size:13px;font-weight:600;padding:8px 14px;cursor:pointer;text-decoration:none;transition:background .2s,color .2s;white-space:nowrap}
.flipmodal-btn:hover{background:var(--gold);color:#241803}
.flipmodal-btn[disabled]{opacity:.35;cursor:default}
.flipmodal-btn svg,.flipmodal-nav svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.flipmodal-close{background:rgba(255,255,255,.1);color:#fff;border:0;width:34px;height:34px;border-radius:6px;font-size:15px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s,color .2s}
.flipmodal-close:hover{background:var(--red);color:#fff}
.flipmodal :focus-visible{outline:3px solid var(--gold);outline-offset:2px}

/* escenario: una mesa oscura con luz cenital; todo lo inmersivo ocurre aquí */
.flipmodal-stage{flex:1 1 auto;min-height:0;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:6px;padding:14px 10px;position:relative;overflow:hidden;touch-action:pan-y;
	background:radial-gradient(ellipse 70% 60% at 50% 38%,#2a4472 0%,#16264a 45%,#0b1424 100%)}
.flipmodal-stage::before{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(ellipse 45% 30% at 50% 0%,rgba(255,236,190,.14),transparent 70%)}
.flipmodal-book{position:relative;width:100%;height:100%;min-height:0;display:flex;align-items:center;justify-content:center}
/* El marco 3D: solo .flip-tilt se inclina y escala debajo. */
.flip-3d{position:relative;perspective:1750px;perspective-origin:50% 46%;display:flex;align-items:center;justify-content:center}
.flip-tilt{position:relative;transform-style:preserve-3d;transform:rotateX(var(--rx,0deg)) rotateY(var(--ry,0deg)) scale(var(--zoom,1));will-change:transform}
#flipbook{position:relative;transform-style:preserve-3d;z-index:1}
/* sombra en la mesa: un charco suave debajo, que se aligera mientras la hoja está en el aire */
.flip-cast{position:absolute;pointer-events:none;z-index:0}
.flip-cast.ambient{left:-6%;right:-6%;top:8%;bottom:-10%;background:radial-gradient(50% 50% at 50% 58%,rgba(0,0,0,.55) 0%,rgba(0,0,0,.3) 40%,rgba(0,0,0,0) 74%);filter:blur(26px);opacity:calc(1 - var(--shade,0) * .42)}
.flip-cast.contact{left:2%;right:2%;top:70%;bottom:-6%;background:radial-gradient(50% 44% at 50% 42%,rgba(0,0,0,.6) 0%,rgba(0,0,0,.25) 48%,rgba(0,0,0,0) 78%);filter:blur(11px);opacity:calc(1 - var(--shade,0) * .5)}

/* mitades del libro: cada una es una imagen de página */
.fb-half{position:absolute;top:0;bottom:0;width:50%;overflow:clip;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.18)}
.fb-half.left{left:0;border-radius:3px 0 0 3px}
.fb-half.right{left:50%;border-radius:0 3px 3px 0}
.fb-half.empty{background:transparent;box-shadow:none}
.fb-half .fb-img{display:block;width:100%;height:100%;object-fit:fill;user-select:none;-webkit-user-drag:none}
/* lomo: la página se hunde hacia la costura */
.fb-half.left::after,.fb-half.right::after{content:"";position:absolute;top:0;bottom:0;width:7%;pointer-events:none}
.fb-half.left::after{right:0;background:linear-gradient(270deg,rgba(0,0,0,.16),rgba(0,0,0,0))}
.fb-half.right::after{left:0;background:linear-gradient(90deg,rgba(0,0,0,.14),rgba(0,0,0,0))}
.fb-half.empty::after{display:none}
/* la sombra que la hoja levantada arroja sobre la página de debajo */
.gutter-shade{position:absolute;top:0;bottom:0;width:46%;pointer-events:none;opacity:calc(var(--shade,0) * .62)}
.gutter-shade.left{right:0;background:linear-gradient(270deg,rgba(10,20,40,.34),rgba(10,20,40,0) 82%)}
.gutter-shade.right{left:0;background:linear-gradient(90deg,rgba(10,20,40,.28),rgba(10,20,40,0) 82%)}
.fb-half.empty .gutter-shade{display:none}
/* modo una página (pantallas estrechas) */
.fb-one{position:absolute;inset:0;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.18),0 18px 40px rgba(0,0,0,.45);border-radius:3px;overflow:hidden}
.fb-one .fb-img{display:block;width:100%;height:100%;object-fit:contain;user-select:none;-webkit-user-drag:none}

/* ---- la hoja que gira: tiras anidadas que forman una superficie curva ---- */
.curl{position:absolute;top:0;height:100%;width:var(--hw,0px);transform-style:preserve-3d;z-index:6}
.curl.next{left:50%;transform-origin:left center;transform:rotateY(calc(-1 * var(--tt,0deg)))}
.curl.prev{right:50%;transform-origin:right center;transform:rotateY(var(--tt,0deg))}
.strip{position:absolute;top:0;height:100%;width:calc(var(--hw,0px) / var(--n));transform-style:preserve-3d}
.curl.next .strip{transform-origin:left center}
.curl.prev .strip{transform-origin:right center}
.curl.next>.strip{left:0}
.curl.prev>.strip{right:0;left:auto}
.curl.next .strip .strip{left:100%;transform:rotateY(var(--td,0deg))}
.curl.prev .strip .strip{right:100%;transform:rotateY(calc(-1 * var(--td,0deg)))}
.face{position:absolute;top:0;bottom:0;left:0;right:-1.1px;backface-visibility:hidden;-webkit-backface-visibility:hidden;background-repeat:no-repeat;background-size:var(--hw,0px) var(--hh,0px);background-color:#fff}
.face.blank{background-color:#f4f1ea}
.face.back{transform:rotateY(180deg)}
.face .sh{position:absolute;inset:0;pointer-events:none}
.curl.next .face.front .sh,.curl.prev .face.back .sh{background:linear-gradient(90deg,rgba(20,26,40,var(--a1,0)),rgba(20,26,40,var(--a2,0)))}
.curl.next .face.back .sh,.curl.prev .face.front .sh{background:linear-gradient(90deg,rgba(20,26,40,var(--a2,0)),rgba(20,26,40,var(--a1,0)))}
.face .gl{position:absolute;inset:0;pointer-events:none;background:#fffaf0;opacity:calc(var(--shade,0) * var(--lit,1) * var(--lit,1) * .20)}
.strip.edge .face{box-shadow:inset -1px 0 0 rgba(0,0,0,.12)}

/* zonas de toque/arrastre: mitad izquierda = atrás, mitad derecha = adelante */
.fb-zone{position:absolute;top:0;bottom:0;border:0;background:transparent;cursor:grab;z-index:60;-webkit-tap-highlight-color:transparent;padding:0}
.fb-zone:active{cursor:grabbing}
.fb-prev{left:0;width:50%}
.fb-next{right:0;width:50%}
.fb-one ~ .fb-prev{width:35%}.fb-one ~ .fb-next{width:65%}

.flipmodal-nav{width:44px;height:72px;border:0;border-radius:10px;background:rgba(255,255,255,.08);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s;z-index:2}
.flipmodal-nav:hover{background:var(--gold);color:#241803}
.flipmodal-nav svg{width:26px;height:26px}
.flipmodal-nav[disabled]{opacity:.25;cursor:default;background:transparent}

.flipmodal-foot{flex:0 0 auto;display:flex;align-items:center;gap:14px;padding:10px 18px;background:var(--navy2);border-top:1px solid rgba(255,255,255,.1);z-index:3}
.flipmodal-range{flex:1 1 auto;accent-color:var(--gold);cursor:pointer;height:6px}
.flipmodal-zoomctl{display:inline-flex;align-items:center;gap:4px;border:1px solid rgba(255,255,255,.14);border-radius:999px;padding:3px 6px}
.flipmodal-zoomctl .flipmodal-btn{padding:5px 9px;border-radius:999px}
.flipmodal-zread{font-size:12px;min-width:42px;text-align:center;font-variant-numeric:tabular-nums;color:var(--sky)}
.flipmodal-hint{font-size:12px;color:var(--sky);white-space:nowrap}

.flipmodal-zoom{position:absolute;inset:0;z-index:5;background:rgba(8,22,46,.96);overflow:auto;cursor:zoom-out}
.flipmodal-zoom[hidden]{display:none}
.flipmodal-zoom img{display:block;margin:24px auto;max-width:none;width:min(1400px,180vw);height:auto;box-shadow:0 20px 60px rgba(0,0,0,.6)}
.flipmodal-zoom-close{position:fixed;top:14px;right:16px;z-index:6}
.admin-bar .flipmodal-zoom-close{top:46px}

@media (max-width:760px){
	.flipmodal-head{grid-template-columns:auto 1fr auto;gap:8px;padding:9px 10px}
	.flipmodal-read,.flipmodal-dl,.flipmodal-fs,.flipmodal-zoomctl{display:none}
	.flipmodal-title{max-width:60vw;font-size:13px}
	.flipmodal-stage{grid-template-columns:1fr;padding:8px}
	.flipmodal-nav{display:none}
	.flipmodal-hint{display:none}
	.flipmodal-foot{padding:8px 12px}
}
@media (prefers-reduced-motion:reduce){.flipmodal-btn,.flipbtn,.flipmodal-nav{transition:none}.flip-tilt{transform:none !important}}