/* NexoMath V65 · Presentación sobria y legible. Usa la paleta existente. */

/* ---------- Guía: tarjeta de varias caras ---------- */
#conceptMaster.v65-guide .concept-cols,
#conceptMaster.v65-guide #conceptDefinition,
#conceptMaster.v65-guide #v26ConceptExtra{display:none!important}
#conceptMaster.v65-guide{padding-bottom:18px}
#conceptMaster.v65-guide>h3{margin-bottom:12px}
.nx-guide{margin:4px 0 14px;outline:none}
.nx-tabs{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none;padding:2px 1px 12px;-webkit-overflow-scrolling:touch}
.nx-tabs::-webkit-scrollbar{display:none}
.nx-tab{flex:0 0 auto;border:1px solid var(--line);background:#fff;color:var(--muted);border-radius:999px;padding:7px 13px;font-size:13px;font-weight:750;line-height:1.2;transition:background .2s,color .2s,border-color .2s}
.nx-tab:hover{border-color:#cfd3ff;color:#3b3f8f}
.nx-tab.on{background:#eef0ff;color:var(--p);border-color:#d6d9ff}
.nx-viewport{position:relative;overflow:hidden;border-radius:20px;border:1px solid var(--line);background:linear-gradient(180deg,#fcfcff,#f8f9fd);transition:height .32s ease;user-select:none;-webkit-user-select:none}
.nx-track{display:flex;align-items:flex-start;transition:transform .38s cubic-bezier(.22,.8,.24,1);will-change:transform}
.nx-face{flex:0 0 100%;width:100%;padding:22px 24px 24px;user-select:text;-webkit-user-select:text}
.nx-label{font-size:11px;letter-spacing:.13em;text-transform:uppercase;font-weight:850;color:var(--p)}
.nx-face h4{font-size:20px;line-height:1.3;margin:6px 0 12px;color:var(--ink);letter-spacing:-.01em}
.nx-face p,.nx-idea,.nx-step-body{font-size:16px;line-height:1.72;color:#3c4353;margin:0 0 12px}
.nx-idea p{margin:0 0 10px}
.nx-face b,.nx-face strong{color:#232838}
.nx-formula{margin:6px 0 14px;padding:13px 16px;border-radius:14px;background:#fff;border:1px dashed #cfd3ff;text-align:center;font-size:20px;font-weight:750;color:#2d3170;letter-spacing:.01em;overflow-x:auto}
.nx-look{font-size:15px!important;color:#4a5163!important}
.nx-plot{margin:4px auto 12px;max-width:340px}
.nx-plot svg{display:block;width:100%;height:auto;background:#fff;border:1px solid var(--line);border-radius:14px}
.nx-plot .g{stroke:#eef0f6;stroke-width:1}
.nx-plot .a{stroke:#9aa1b5;stroke-width:1.3}
.nx-plot .c0{fill:none;stroke:var(--p);stroke-width:3;stroke-linecap:round;stroke-linejoin:round}
.nx-plot .c1{fill:none;stroke:#e08a1e;stroke-width:2.6;stroke-linecap:round}
.nx-plot .c2{fill:none;stroke:#16a66a;stroke-width:2.6;stroke-linecap:round}
.nx-plot .dash{stroke:#e5484d;stroke-width:1.6;stroke-dasharray:5 4}
.nx-plot .pt{fill:#fff;stroke:var(--p2);stroke-width:2.4}
.nx-plot .lb{font:700 11px Inter,system-ui,sans-serif;fill:#3b3f62}
.nx-plot figcaption{font-size:12.5px;color:var(--muted);text-align:center;margin-top:6px}
.nx-rules{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.nx-rules li{position:relative;padding:11px 14px 11px 40px;border-radius:14px;background:#fff;border:1px solid var(--line);font-size:15.5px;line-height:1.62;color:#3c4353}
.nx-rules li:before{content:"✓";position:absolute;left:13px;top:11px;width:19px;height:19px;border-radius:50%;background:#eef0ff;color:var(--p);font-size:11px;font-weight:900;display:grid;place-items:center}
.nx-step-body ul{margin:4px 0 0;padding-left:20px}.nx-step-body li{margin:4px 0}
.nx-ex{margin-top:8px;padding:12px 15px;border-radius:0 14px 14px 0;border-left:3px solid var(--p);background:#fff;box-shadow:0 1px 0 var(--line)}
.nx-ex>span{display:block;font-size:11px;font-weight:850;letter-spacing:.12em;text-transform:uppercase;color:var(--p);margin-bottom:4px}
.nx-ex>div{font-size:16px;line-height:1.75;color:#262b3b;overflow-x:auto}
.nx-problem{padding:13px 15px;border-radius:14px;background:#fff;border:1px solid var(--line);font-size:16px;line-height:1.7;font-weight:650;color:#262b3b;margin:4px 0 12px;overflow-x:auto}
.nx-cont{font-size:14px!important;color:var(--muted)!important;margin-bottom:6px!important}
.nx-worked{margin:0;padding-left:22px}
.nx-worked li{margin:0 0 14px;padding-left:4px}
.nx-worked li::marker{font-weight:800;color:var(--p)}
.nx-worked b{font-size:15px}
.nx-worked .nx-math{margin:5px 0 3px;padding:7px 11px;border-radius:10px;background:#fff;border:1px solid #eceff6;font-size:16px;font-weight:700;line-height:1.8;color:#262b3b;overflow-x:auto;max-width:100%}
.nx-worked p{font-size:14.5px!important;line-height:1.6!important;color:#5a6172!important;margin:4px 0 0!important}
.nx-answer{display:flex;flex-wrap:wrap;gap:8px;align-items:baseline;margin-top:6px;padding:11px 14px;border-radius:14px;background:#eaf9f1;border:1px solid #c5ebd6;font-weight:750;color:#0d5f3a;line-height:1.6}
.nx-answer span{font-size:11px;letter-spacing:.12em;text-transform:uppercase;font-weight:900;color:#087849}
.nx-note{padding:12px 15px;border-radius:14px;margin:0 0 10px;border:1px solid var(--line);background:#fff}
.nx-note p{margin:5px 0 0!important;font-size:15px!important}
.nx-note-ok{border-left:3px solid #16a66a}
.nx-note-warn{border-left:3px solid #f59e0b;background:#fffdf6}
.nx-another{margin-top:6px}
.nx-nav{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:12px}
.nx-arrow{border:1px solid var(--line);background:#fff;color:#343947;border-radius:13px;padding:10px 15px;font-weight:800;font-size:14px;min-width:46px;transition:transform .15s,opacity .2s}
.nx-arrow.nx-primary{background:var(--p);border-color:var(--p);color:#fff}
.nx-arrow:disabled{opacity:.35;cursor:default}
.nx-arrow:not(:disabled):active{transform:scale(.97)}
.nx-count{display:flex;flex-direction:column;align-items:center;gap:6px;font-size:12px;color:var(--muted);font-weight:700}
.nx-count b{color:var(--ink)}
.nx-dots{display:flex;flex-wrap:wrap;justify-content:center;gap:5px;max-width:220px}
.nx-dots i{width:7px;height:7px;border-radius:99px;background:#dfe2ec;cursor:pointer;transition:width .25s,background .25s}
.nx-dots i.on{width:18px;background:var(--p)}
#conceptMaster.v65-guide #v63Understanding{margin-top:18px}
#conceptMaster.v65-guide #v63Understanding>h4{font-size:17px}
#conceptMaster.v65-guide .v63-check b{font-weight:750;line-height:1.55}
@media(max-width:700px){
 .nx-face{padding:18px 16px 20px}
 .nx-face h4{font-size:18px}
 .nx-face p,.nx-idea,.nx-step-body{font-size:15.5px;line-height:1.68}
 .nx-rules li{font-size:15px;padding:10px 12px 10px 38px}
 .nx-formula{font-size:18px;padding:11px 12px}
 .nx-arrow span{display:none}
 .nx-arrow{padding:10px 16px;font-size:16px}
 .nx-dots{max-width:170px}
}

/* ---------- Activa tus conocimientos ---------- */
#kidLab #kidBoard{font-size:18px;line-height:1.6}
#kidLab #kidBoard.nx-short{font-size:clamp(28px,4.2vw,40px);font-weight:850;color:#2a2550}
#kidLab #kidBoard.nx-mid{font-size:clamp(21px,2.8vw,27px);font-weight:750;color:#2a2550}
#kidLab #kidBoard.nx-prose{font-size:clamp(16.5px,1.9vw,19px);font-weight:500;justify-content:flex-start;text-align:left;min-height:0!important;padding:18px 20px!important;line-height:1.65}
#kidLab #kidBoard .v63-inline-math{font-size:inherit!important}
.nx-warm-topic,.nx-warm-problem{width:100%;text-align:left}
.nx-warm-topic small,.nx-warm-problem small{display:block;font-size:11px;font-weight:850;letter-spacing:.13em;text-transform:uppercase;color:#8a4fc2;margin-bottom:6px}
.nx-warm-topic span{display:block;font-size:17px;line-height:1.65;color:#2f3347}
.nx-warm-problem>div{font-size:17px;line-height:1.7;color:#2f3347;font-weight:550}
#kidLab #kidInstruction{font-weight:700;color:#3a2a63;line-height:1.5}
#kidLab .kid-choices.nx-opts-mid button{font-size:21px!important}
#kidLab .kid-choices.nx-opts-long,#kidLab .kid-choices.nx-opts-xl{grid-template-columns:repeat(2,minmax(0,1fr))!important}
#kidLab .kid-choices.nx-opts-xl{grid-template-columns:1fr!important}
#kidLab .kid-choices.nx-opts-long button,#kidLab .kid-choices.nx-opts-xl button{font-size:16.5px!important;font-weight:700!important;line-height:1.5;text-align:left;place-items:center start;justify-items:start;padding:12px 16px!important;min-height:54px!important}
#kidLab .kid-choices button,#choices button,#evalChoices button,#mixedChoices button{overflow-wrap:normal!important;word-break:normal!important;hyphens:none}
#kidLab .kid-choices button .v63-inline-math{text-align:left!important}

/* ---------- Ahora practícalo ---------- */
#question.nx-prose,#mixedQ.nx-prose,#evalQuestion.nx-prose{font-size:clamp(17px,1.9vw,21px)!important;font-weight:650!important;line-height:1.65!important;text-align:left!important;letter-spacing:0!important;padding:20px 22px!important;color:#1e2333}
#question.nx-mid,#mixedQ.nx-mid{font-size:clamp(24px,3.2vw,34px)!important;line-height:1.4!important}
#question.nx-short{font-size:clamp(30px,4.6vw,48px)!important}
#question,#mixedQ,#evalQuestion{overflow-wrap:normal!important;word-break:normal!important}
#choices.nx-opts-long button,#choices.nx-opts-xl button,#evalChoices.nx-opts-xl button{font-weight:650;line-height:1.55}
#topicUnlock.nx-review h3{font-size:16px}
#topicUnlock.nx-review{opacity:.92}

@media(max-width:700px){
 #kidLab .kid-choices.nx-opts-long,#kidLab .kid-choices.nx-opts-xl{grid-template-columns:1fr!important}
 #kidLab .kid-choices.nx-opts-mid{grid-template-columns:repeat(2,minmax(0,1fr))!important}
 #kidLab .kid-choices.nx-opts-mid button{font-size:19px!important}
 #kidLab #kidBoard.nx-prose{padding:15px 15px!important}
 .nx-warm-topic span,.nx-warm-problem>div{font-size:16px}
 #question.nx-prose,#mixedQ.nx-prose,#evalQuestion.nx-prose{font-size:16.5px!important;padding:16px!important}
 #question.nx-mid{font-size:24px!important}
 #question.nx-short{font-size:32px!important}
}

/* ---------- Comprueba que puedes explicarlo: acordeón compacto ---------- */
#conceptMaster.v65-guide #v63Understanding>p{font-size:14px;color:var(--muted)}
#conceptMaster.v65-guide details.v63-check{margin:8px 0;padding:0;border:1px solid var(--line);border-radius:14px;background:#fff;overflow:hidden}
#conceptMaster.v65-guide details.v63-check>summary{list-style:none;padding:12px 40px 12px 14px;font-weight:700;font-size:15px;line-height:1.5;position:relative;color:#272c3c}
#conceptMaster.v65-guide details.v63-check>summary::-webkit-details-marker{display:none}
#conceptMaster.v65-guide details.v63-check>summary:after{content:"+";position:absolute;right:14px;top:10px;width:22px;height:22px;border-radius:50%;background:#f1f3f8;display:grid;place-items:center;font-weight:800;color:var(--p)}
#conceptMaster.v65-guide details.v63-check[open]>summary:after{content:"–"}
#conceptMaster.v65-guide details.v63-check>.choices,#conceptMaster.v65-guide details.v63-check>.v63-check-feedback,#conceptMaster.v65-guide details.v63-check>.v63-compare{padding:0 14px 12px}
#conceptMaster.v65-guide details.v63-check .choice{font-size:14.5px;font-weight:650;padding:10px 12px;min-height:40px;text-align:left}
#conceptMaster.v65-guide .v63-compare p{font-size:14.5px;line-height:1.6;color:#454c5d;margin:4px 0}
.nx-count>span{white-space:nowrap}
.nx-plot .tri{stroke:var(--p);stroke-width:2.6;stroke-linecap:round}
.nx-formula{white-space:normal}
#kidLab #kidBoard.nx-short,#kidLab #kidBoard.nx-mid{justify-content:center!important;text-align:center}
#kidLab .kid-choices button,.nx-face,.nx-problem,#question{text-wrap:pretty}
#kidNewBtn{white-space:nowrap}
.nx-stepblock{display:grid;grid-template-columns:30px minmax(0,1fr);gap:12px;padding:12px 0;border-top:1px solid #eceff6}
.nx-stepblock:first-of-type{border-top:0;padding-top:8px}
.nx-stepnum{width:28px;height:28px;border-radius:50%;background:#eef0ff;color:var(--p);font-weight:850;font-size:14px;display:grid;place-items:center;margin-top:1px}
.nx-stepmain h5{margin:2px 0 4px;font-size:16.5px;color:var(--ink);line-height:1.35}
.nx-stepmain .nx-step-body{margin:0 0 6px;font-size:15.5px}
.nx-stepmain .nx-ex{margin-top:4px;padding:9px 13px}
.nx-stepmain .nx-ex>div{font-size:15.5px}
.nx-stepmain .nx-ex>span{display:none}.nx-stepmain .nx-ex{background:#fff;border-left-width:3px}
.nx-label+.nx-idea{margin-top:8px}
/* V67 · paso guiado de la activación */
.nx-warm-step{width:100%;text-align:left;margin-top:12px;border-top:2px dashed rgba(138,79,194,.28);padding-top:12px}
.nx-warm-step small{display:block;font-size:11px;font-weight:850;letter-spacing:.13em;text-transform:uppercase;color:#0b7a55;margin-bottom:6px}
.nx-warm-step>div{font-size:17px;line-height:1.7;color:#1f2a44;font-weight:700}
@media(max-width:620px){.nx-warm-step>div{font-size:16px}}