/* CoreKnowledge Books: Look-inside viewer v2 (assets/books-viewer.js). CK navy stage, white tool buttons, red current marker. */
.bkv{position:fixed;inset:0;z-index:100002;display:flex;flex-direction:column;background:radial-gradient(ellipse at 50% 30%,#24317A 0,#151F5A 60%,#0F1745 100%);color:#fff;
 -webkit-user-select:none;user-select:none;-webkit-touch-callout:none;font-family:'Public Sans',system-ui,sans-serif}
.bkv[hidden]{display:none}
body.bkv-open{overflow:hidden}
.bkv-top{display:flex;align-items:center;justify-content:space-between;gap:10px 16px;flex-wrap:wrap;padding:10px 16px;background:rgba(10,16,52,.55);border-bottom:1px solid rgba(255,255,255,.12)}
.bkv-ttl{min-width:0;display:flex;flex-direction:column;gap:2px}
.bkv-ttl b{font-family:'Cabin',sans-serif;font-size:18px;line-height:1.2;color:#fff!important}
.bkv-count{font-size:14px;font-weight:600;color:#C9CFF0}
.bkv-tools{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.bkv-b{display:inline-flex;align-items:center;gap:6px;min-width:44px;height:44px;padding:0 11px;border-radius:12px;border:1px solid rgba(255,255,255,.28);
 background:rgba(255,255,255,.1);color:#fff;font:700 14px 'Public Sans',sans-serif;cursor:pointer;justify-content:center;transition:background .15s,transform .15s}
.bkv-b:hover{background:rgba(255,255,255,.22)}
.bkv-b:active{transform:translateY(1px)}
.bkv-b:disabled{opacity:.35;cursor:default}
.bkv-b:focus-visible,.bkv-nv:focus-visible,.bkv-th:focus-visible{outline:3px solid #FDE68A;outline-offset:2px}
.bkv-area[aria-pressed="true"]{background:#FDE68A;color:#1B2766;border-color:#FDE68A}
.bkv-close{background:#fff;color:#1B2766;border-color:#fff;margin-left:6px}
.bkv-close:hover{background:#EEF0FF}
.bkv-pct{min-width:52px;text-align:center;font-weight:800;font-size:14px;color:#fff}
.bkv-stage{position:relative;flex:1;min-height:0;overflow:hidden;touch-action:none;cursor:default}
.bkv-stage.bkv-zoomed{cursor:grab}.bkv-stage.bkv-grab{cursor:grabbing}.bkv-stage.bkv-areamode{cursor:crosshair}
.bkv-cv{position:absolute;inset:0;display:block;transition:filter .2s}
.bkv-wm{position:absolute;pointer-events:none;background-repeat:repeat;background-size:340px 230px;
 background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='340' height='230'%3E%3Ctext x='170' y='120' text-anchor='middle' transform='rotate(-32 170 115)' font-family='Arial,Helvetica,sans-serif' font-weight='700' font-size='20' fill='%231B2766' fill-opacity='0.13'%3ESAMPLE %C2%B7 coreknowledge.digital%3C/text%3E%3C/svg%3E")}
.bkv-sel{position:absolute;border:2px dashed #FDE68A;background:rgba(253,230,138,.16);box-shadow:0 0 0 9999px rgba(10,16,52,.35);pointer-events:none}
.bkv-hint{position:absolute;left:50%;top:12px;transform:translateX(-50%);background:#FDE68A;color:#1B2766;font-weight:800;font-size:14px;padding:8px 14px;border-radius:999px;pointer-events:none;white-space:nowrap}
.bkv-nv{position:absolute;top:50%;transform:translateY(-50%);width:52px;height:52px;border-radius:50%;border:0;background:#fff;color:#1B2766;display:grid;place-items:center;cursor:pointer;box-shadow:0 8px 22px rgba(0,0,0,.35);z-index:2}
.bkv-nv svg{width:24px;height:24px}
.bkv-nv:disabled{opacity:.3;cursor:default}
.bkv-prev{left:16px}.bkv-next{right:16px}
.bkv-load{position:absolute;inset:0;display:grid;place-items:center;font-weight:700;color:#DCE0F5}
.bkv-load[hidden],.bkv-shield[hidden],.bkv-hint[hidden],.bkv-sel[hidden]{display:none}
.bkv-shield{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;background:rgba(15,23,69,.55);text-align:center;padding:20px;z-index:3}
.bkv-shield b{font-family:'Cabin',sans-serif;font-size:22px;color:#fff!important}.bkv-shield span{color:#DCE0F5}
.bkv-paused .bkv-cv,.bkv-paused .bkv-thumbs img{filter:blur(18px)}
.bkv-thumbs{display:flex;gap:8px;overflow-x:auto;padding:10px 16px 4px;scrollbar-width:thin}
.bkv-th{flex:none;width:62px;padding:0;border:3px solid transparent;border-radius:8px;background:#fff;cursor:pointer;position:relative;overflow:hidden}
.bkv-th img{display:block;width:100%;aspect-ratio:1/1.414;object-fit:cover;pointer-events:none}
.bkv-th span{position:absolute;left:0;right:0;bottom:0;background:rgba(27,39,102,.85);color:#fff;font-size:12px;font-weight:700;padding:1px 0;text-align:center}
.bkv-th[aria-current="true"]{border-color:#D61F1F;box-shadow:0 0 0 2px #fff}
.bkv-note{margin:0;padding:4px 16px 10px;font-size:12px;color:#AEB6E0;text-align:center}
.bkv.bkv-fs .bkv-note{display:none}
@media (max-width:720px){
 .bkv-top{padding:8px 10px;gap:6px}
 .bkv-ttl b{font-size:15px}.bkv-count{font-size:12px}
 .bkv-tools{width:100%;justify-content:space-between;gap:4px}
 .bkv-b{min-width:40px;height:40px;padding:0 8px}
 .bkv-b span{display:none}.bkv-close{margin-left:0}
 .bkv-pct{min-width:42px;font-size:13px}
 .bkv-nv{width:40px;height:40px}.bkv-prev{left:6px}.bkv-next{right:6px}
 .bkv-th{width:48px}
 .bkv-note{display:none}
}
@media print{.bkv{display:none!important}body.bkv-open *{visibility:hidden!important}}
@media (prefers-reduced-motion:reduce){.bkv-b,.bkv-cv{transition:none}}