/* NexoMind · Libro digital */
.nl-book{background:#fff;border:1px solid #e3def7;border-radius:22px;overflow:hidden;color:#232548;box-shadow:0 10px 30px rgba(73,58,170,.07)}
.nl-top{display:flex;justify-content:space-between;gap:18px;padding:24px 26px;background:linear-gradient(118deg,#efeaff 0%,#eaf8fb 100%);border-bottom:1px solid #e6e1f8}
.nl-top h2{margin:6px 0 8px;font-size:clamp(22px,3vw,30px);line-height:1.2;color:#2c2273}
.nl-eyebrow{display:inline-block;font-size:11px;font-weight:800;letter-spacing:.12em;color:#5d48c8;text-transform:uppercase}
.nl-unit{margin:6px 0 0;font-size:13px;color:#5b5f86;font-weight:600}
.nl-objective{margin:0;font-size:15px;line-height:1.6;max-width:760px}
.nl-actions{display:flex;flex-direction:column;gap:8px;align-items:stretch;min-width:190px}
.nl-actions .n76-btn{white-space:nowrap}
.nl-toc{display:flex;gap:8px;overflow-x:auto;padding:14px 22px;border-bottom:1px solid #eeeaf9;background:#fcfbff;scrollbar-width:thin}
.nl-toc button{flex:0 0 auto;display:flex;align-items:center;gap:8px;border:1px solid #ddd7f4;background:#fff;color:#3a3570;border-radius:999px;padding:8px 14px 8px 8px;font:600 13px/1.2 system-ui,sans-serif;cursor:pointer;max-width:280px;text-align:left}
.nl-toc button b{display:inline-grid;place-items:center;min-width:24px;height:24px;border-radius:50%;background:#ece8ff;color:#5d48c8;font-size:12px}
.nl-toc button.seen b{background:#d9f5ec;color:#167a5a}
.nl-toc button.on{background:#5d48c8;color:#fff;border-color:#5d48c8}
.nl-toc button.on b{background:#fff;color:#5d48c8}
.nl-pages{padding:8px 26px 10px}
.nl-page{padding:18px 0 22px;border-bottom:1px dashed #e4dff6}
.nl-page:last-child{border-bottom:0}
.nl-pagehead{display:flex;flex-direction:column;gap:6px;margin-bottom:10px}
.nl-badge{align-self:flex-start;background:#fff3d6;color:#7a5410;border-radius:8px;padding:3px 10px;font:800 11px/1.6 system-ui;letter-spacing:.06em;text-transform:uppercase}
.nl-pagehead h3{margin:0;font-size:clamp(20px,2.6vw,26px);color:#33287f}
.nl-figure{margin:6px auto 14px;max-width:820px;border-radius:16px;overflow:hidden;border:1px solid #ebe7f8;background:#fbfaff}
.nl-figure svg,.nl-figure img{display:block;width:100%;height:auto}
.nl-3dbtn{margin:10px}
.nl-3dhost{padding:0 10px 12px}
.nl-strip{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin:6px 0 16px;padding:16px;border-radius:18px;background:radial-gradient(circle at 20% 10%,#fff8e1,transparent 60%),linear-gradient(135deg,#f3f0ff,#ecfaf6)}
.nl-strip div{width:clamp(70px,13vw,112px);aspect-ratio:1;display:grid;place-items:center;background:#fff;border-radius:22px;box-shadow:0 6px 16px rgba(80,60,170,.10)}
.nl-strip img{width:78%;height:78%;object-fit:contain}
.nl-strip figcaption{flex-basis:100%;text-align:center;font:700 14px system-ui;color:#4a3fa0}
.nl-text p{font-size:17px;line-height:1.85;margin:0 0 14px;max-width:78ch}
.nl-text p:first-child::first-letter{font-size:1.9em;font-weight:800;color:#5d48c8;float:left;line-height:1;margin:4px 6px 0 0}
.nl-box{border:1px solid #e7e3f6;border-radius:16px;padding:14px 18px;margin:14px 0;background:#fdfcff}
.nl-box h4{display:flex;align-items:center;gap:10px;margin:0 0 10px;font-size:16px;color:#3d318f}
.nl-ico{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:9px;background:#ece8ff;color:#5d48c8;font:800 13px system-ui}
.nl-examples{background:#f2fbff;border-color:#cdeaf6}
.nl-examples ol{margin:0;padding-left:22px}.nl-examples li{margin:6px 0;line-height:1.7}
.nl-flow{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:10px;align-items:stretch}
.nl-flow li{position:relative;flex:1 1 150px;display:flex;gap:10px;align-items:flex-start;background:#fff;border:1px solid #dcd5f6;border-radius:14px;padding:10px 12px;font-size:14.5px;line-height:1.45}
.nl-flow li b{flex:0 0 auto;display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:#5d48c8;color:#fff;font-size:13px}
.nl-flow li:not(:last-child)::after{content:'➜';position:absolute;right:-12px;top:50%;transform:translateY(-50%);color:#9b8de6;font-size:16px;z-index:1}
.nl-tree{display:flex;flex-direction:column;align-items:center}
.nl-root{background:#5d48c8;color:#fff;font-weight:800;border-radius:12px;padding:8px 16px;text-align:center;position:relative;margin-bottom:22px}
.nl-root::after{content:'';position:absolute;left:50%;top:100%;height:22px;border-left:2px solid #b7acef}
.nl-branches{display:grid;grid-template-columns:repeat(var(--n),minmax(0,1fr));gap:12px;width:100%;position:relative;padding-top:14px;border-top:2px solid #b7acef}
.nl-branch{background:#fff;border:1px solid #ddd6f6;border-radius:14px;overflow:hidden}
.nl-gname{background:#efeaff;color:#3d318f;font-weight:800;text-align:center;padding:8px;font-size:14px}
.nl-branch ul{list-style:none;margin:0;padding:8px;display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.nl-branch li{display:flex;flex-direction:column;align-items:center;gap:4px;font-size:13.5px;text-align:center;min-width:72px;max-width:120px}
.nl-branch li img{width:52px;height:52px;object-fit:contain}
.nl-vocab dl{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px;margin:0}
.nl-vocab dl div{background:#fff;border:1px solid #ebe6f9;border-left:4px solid #1abdd7;border-radius:12px;padding:10px 12px}
.nl-vocab dt{font-weight:800;color:#2c2273}.nl-vocab dd{margin:4px 0 0;line-height:1.55;font-size:14.5px}
.nl-check details{border:1px solid #eee9fb;border-radius:12px;padding:10px 12px;margin:8px 0;background:#fff}
.nl-check summary{cursor:pointer;font-weight:700}
.nl-check details p{margin:8px 0 0;color:#255d4b;line-height:1.6}
.nl-life{background:#fffaf0;border-color:#f3e0b5}
.nl-remember{background:#eefbf6;border-radius:14px;padding:12px 16px;border:1px solid #c9eedf;line-height:1.6}
.nl-sumlist li{margin:8px 0;line-height:1.7}
.nl-route{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:0;counter-reset:r}
.nl-route li{counter-increment:r;background:#fff;border:1px solid #ddd6f6;border-radius:999px;padding:6px 12px;font-size:13px}
.nl-route li::before{content:counter(r) '. ';font-weight:800;color:#5d48c8}
.nl-route li.done{background:#d9f5ec;border-color:#9fdcc5}
.nl-foot{display:flex;justify-content:space-between;gap:10px;padding:16px 26px;border-top:1px solid #eeeaf9;background:#fcfbff}
.nl-hint{font-size:13.5px;color:#5b5f86;line-height:1.55}
/* niveles */
.nl-kids .nl-text p{font-size:20px;line-height:1.9}
.nl-kids .nl-pagehead h3{font-size:clamp(23px,3vw,30px)}
.nl-kids .nl-vocab dd,.nl-kids .nl-flow li{font-size:16px}
.nl-bach .nl-text p{font-size:16.5px;text-align:justify;hyphens:auto}
/* tareas y proyecto */
.nl-task ol li,.nl-project ol li{margin:7px 0;line-height:1.6}
.nl-pgrid{display:grid;grid-template-columns:1fr 1.6fr;gap:16px}
.nl-pgrid h4{margin:6px 0}
/* pizarra */
.nl-boardzone{display:grid;gap:16px;margin-top:16px}
.nl-boardbar{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-bottom:10px}
.nl-boardbar button{border:1px solid #d9d2f4;background:#fff;border-radius:10px;padding:7px 10px;font:600 13px system-ui;cursor:pointer;color:#33287f}
.nl-boardbar button.on{background:#5d48c8;color:#fff;border-color:#5d48c8}
.nl-colors{display:inline-flex;gap:4px;flex-wrap:wrap}
.nl-colors button{width:26px;height:26px;padding:0;border-radius:50%;border:2px solid #fff;box-shadow:0 0 0 1px #c9c2e8}
.nl-colors button.on{box-shadow:0 0 0 3px #5d48c8}
.nl-textin{border:1px solid #d9d2f4;border-radius:10px;padding:7px 10px;font:14px system-ui;min-width:150px;flex:1 1 150px;max-width:240px}
.nl-canvaswrap{position:relative;border:1px solid #e3def7;border-radius:16px;overflow:hidden;background:#fff;aspect-ratio:16/9}
.nl-canvaswrap canvas{position:absolute;inset:0;width:100%;height:100%}
.nl-fg{cursor:crosshair;touch-action:none}
.nl-3dpick{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}.nl-3dpick .on{outline:2px solid #5d48c8}
.m3d{border:1px solid #e3def7;border-radius:16px;overflow:hidden;background:#fff}
.m3d canvas{display:block;cursor:grab;outline:none}
.m3d-bar{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;padding:10px 12px;border-top:1px solid #eeeaf9;font:14px system-ui}
.m3d-bar button{border:1px solid #d9d2f4;background:#fff;border-radius:9px;padding:6px 10px;margin-left:4px;cursor:pointer;font:600 12.5px system-ui}
.m3d-ctrl{display:flex;flex-wrap:wrap;gap:14px;padding:0 12px 10px;font:600 13px system-ui}
.m3d-ctrl input{vertical-align:middle;width:150px}
.m3d-note{margin:0;padding:0 12px 12px;font:13.5px/1.5 system-ui;color:#5b5f86}
@media (max-width:760px){
 .nl-top{flex-direction:column;padding:18px 16px}
 .nl-actions{flex-direction:row;flex-wrap:wrap;min-width:0}
 .nl-actions .n76-btn{flex:1 1 140px;white-space:normal}
 .nl-pages{padding:4px 14px 8px}
 .nl-toc{padding:10px 12px}
 .nl-foot{padding:12px 14px}
 .nl-foot .n76-btn{flex:1}
 .nl-text p{font-size:16px}
 .nl-kids .nl-text p{font-size:18px}
 .nl-branches{grid-template-columns:1fr 1fr}
 .nl-flow{flex-direction:column}
 .nl-flow li:not(:last-child)::after{content:'↓';right:auto;left:22px;top:auto;bottom:-15px;transform:none}
 .nl-pgrid{grid-template-columns:1fr}
}
@media (max-width:420px){.nl-branches{grid-template-columns:1fr}}
@media print{.nl-toc,.nl-foot,.nl-actions{display:none}}