/* Nexus Academy — Aula
   Compromiso deliberado con fondo oscuro: es una interfaz centrada en video. */

.nexus-aula,
.nexus-dash,
.nexus-verificar {
	--nx-ground:#0E1218; --nx-surface:#161C25; --nx-surface-2:#1D242F; --nx-surface-3:#243040;
	--nx-line:#252E3A; --nx-line-soft:#1F2732;
	--nx-ink:#E9ECF1; --nx-ink-2:#A7B1C0; --nx-ink-3:#6C7889;
	--nx-accent:#E8A33D; --nx-accent-soft:rgba(232,163,61,.14); --nx-accent-line:rgba(232,163,61,.35);
	--nx-done:#7FB069; --nx-done-soft:rgba(127,176,105,.15);
	--nx-serif:Georgia,"Times New Roman",serif;
	--nx-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
	--nx-r:10px;

	background:var(--nx-ground);
	color:var(--nx-ink);
	line-height:1.55;
}

.nexus-aula *,
.nexus-dash *,
.nexus-verificar *{box-sizing:border-box}

.nexus-aula h1,.nexus-aula h2,.nexus-aula h3,
.nexus-dash h1,.nexus-dash h3{
	font-family:var(--nx-serif);font-weight:600;text-wrap:balance;margin:0;color:var(--nx-ink);
}

.nexus-aula :focus-visible,
.nexus-dash :focus-visible{outline:2px solid var(--nx-accent);outline-offset:2px;border-radius:4px}

@media (prefers-reduced-motion:reduce){
	.nexus-aula *,.nexus-dash *{transition:none!important}
}

.nexus-aviso{
	padding:22px;background:#161C25;border:1px solid #252E3A;border-radius:10px;color:#A7B1C0;
}
.nexus-aviso a{color:#E8A33D}

/* ---------- barra superior ---------- */
.nx-top{
	display:flex;align-items:center;gap:20px;padding:0 22px;height:56px;
	background:var(--nx-surface);border-bottom:1px solid var(--nx-line);
}
.nx-crumb{color:var(--nx-ink-3);font-size:13px;display:flex;gap:9px;align-items:center;min-width:0}
.nx-crumb b{color:var(--nx-ink-2);font-weight:400;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nx-top-right{margin-left:auto;display:flex;align-items:center;gap:18px}
.nx-prog{display:flex;align-items:center;gap:10px}
.nx-bar{width:110px;height:5px;background:var(--nx-surface-3);border-radius:3px;overflow:hidden}
.nx-fill{display:block;height:100%;background:var(--nx-accent);border-radius:3px;transition:width .35s ease}
.nx-pct{font-family:var(--nx-mono);font-size:12px;color:var(--nx-ink-2);font-variant-numeric:tabular-nums}

/* ---------- shell ---------- */
.nx-shell{display:grid;grid-template-columns:305px 1fr;min-height:560px}
@media(max-width:900px){.nx-shell{grid-template-columns:1fr}}

.nx-side{
	background:var(--nx-surface);border-right:1px solid var(--nx-line);
	max-height:calc(100vh - 56px);overflow-y:auto;padding-bottom:30px;
}
@media(max-width:900px){.nx-side{max-height:none;border-right:none;border-bottom:1px solid var(--nx-line)}}

.nx-side-head{padding:18px 20px 14px;border-bottom:1px solid var(--nx-line-soft)}
.nx-kicker{font-family:var(--nx-mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--nx-accent)}
.nx-side-head h2{font-size:16.5px;margin-top:7px;line-height:1.3}
.nx-meta{font-family:var(--nx-mono);font-size:11.5px;color:var(--nx-ink-3);margin:9px 0 0;font-variant-numeric:tabular-nums}

.nx-mod{border-bottom:1px solid var(--nx-line-soft)}
.nx-mod-btn{
	width:100%;display:flex;align-items:center;gap:11px;padding:14px 20px;text-align:left;
	background:none;border:none;cursor:pointer;font:inherit;color:inherit;transition:background .15s;
}
.nx-mod-btn:hover{background:var(--nx-surface-2)}
.nx-mod-n{font-family:var(--nx-mono);font-size:11px;color:var(--nx-ink-3);flex:none;width:18px}
.nx-mod-t{flex:1;font-size:13.5px;font-weight:600;line-height:1.35;color:var(--nx-ink)}
.nx-mod-c{font-family:var(--nx-mono);font-size:11px;color:var(--nx-ink-3);flex:none;font-variant-numeric:tabular-nums}
.nx-chev{flex:none;color:var(--nx-ink-3);transition:transform .2s}
.nx-mod[data-open="true"] .nx-chev{transform:rotate(90deg)}
.nx-mod-body{display:none;padding-bottom:8px}
.nx-mod[data-open="true"] .nx-mod-body{display:block}

.nx-les{
	display:flex;align-items:center;gap:11px;padding:8px 20px 8px 24px;
	border-left:2px solid transparent;text-decoration:none;transition:background .15s,border-color .15s;
}
.nx-les:hover{background:var(--nx-surface-2)}
.nx-les[aria-current="true"]{background:var(--nx-accent-soft);border-left-color:var(--nx-accent)}
.nx-les[aria-current="true"] .nx-les-t{color:var(--nx-ink)}
.nx-dot{
	width:16px;height:16px;flex:none;border-radius:50%;border:1.5px solid var(--nx-line);
	display:grid;place-items:center;color:transparent;
}
.nx-les[data-done="true"] .nx-dot{background:var(--nx-done-soft);border-color:var(--nx-done);color:var(--nx-done)}
.nx-les-t{flex:1;font-size:13px;color:var(--nx-ink-2);line-height:1.4}
.nx-les-d{font-family:var(--nx-mono);font-size:11px;color:var(--nx-ink-3);flex:none;font-variant-numeric:tabular-nums}

/* ---------- panel principal ---------- */
.nx-main{overflow-x:hidden}
.nx-stage{
	background:#000;position:relative;aspect-ratio:16/9;max-height:62vh;width:100%;
	display:grid;place-items:center;
}
.nx-stage iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.nx-cap{
	font-family:var(--nx-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
	color:rgba(255,255,255,.4);
}

.nx-body{max-width:820px;padding:30px 34px 60px}
.nx-eyebrow{
	font-family:var(--nx-mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;
	color:var(--nx-accent);margin-bottom:11px;
}
.nx-body h1{font-size:29px;line-height:1.2;letter-spacing:-.015em}
.nx-sub{color:var(--nx-ink-2);margin:14px 0 0;max-width:62ch}
.nx-content{margin-top:26px;color:var(--nx-ink-2)}
.nx-content p,.nx-content li{max-width:65ch}
.nx-content a{color:var(--nx-accent)}
.nx-content h2,.nx-content h3{color:var(--nx-ink);margin-top:28px}

.nx-foot{
	display:flex;align-items:center;gap:14px;margin-top:38px;padding-top:24px;
	border-top:1px solid var(--nx-line);flex-wrap:wrap;
}
.nx-btn{
	display:inline-flex;align-items:center;gap:9px;padding:11px 19px;border-radius:var(--nx-r);
	font-size:13.5px;font-weight:600;text-decoration:none;border:none;cursor:pointer;
	font-family:inherit;transition:background .15s,border-color .15s,color .15s;
}
.nx-btn-p{background:var(--nx-accent);color:#1A1206}
.nx-btn-p:hover{background:#F2B457;color:#1A1206}
.nx-btn-g{border:1px solid var(--nx-line);color:var(--nx-ink-2);background:none}
.nx-btn-g:hover{border-color:var(--nx-ink-3);color:var(--nx-ink)}
.nx-btn-done{background:var(--nx-done-soft);color:var(--nx-done);border:1px solid rgba(127,176,105,.4)}
.nx-btn-done[data-hecha="false"]{opacity:.8}
.nx-btn[disabled]{opacity:.5;cursor:default}
.nx-nx{margin-left:auto;display:flex;gap:10px}

/* ---------- mis cursos ---------- */
.nexus-dash{max-width:1000px;margin:0 auto;padding:52px 34px 80px}
.nexus-dash h1{font-size:32px;letter-spacing:-.02em}
.nx-lead{color:var(--nx-ink-2);margin:10px 0 0}
.nx-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:18px;margin-top:34px}
.nx-card{
	background:var(--nx-surface);border:1px solid var(--nx-line);border-radius:14px;overflow:hidden;
	display:flex;flex-direction:column;transition:border-color .18s,transform .18s;
}
.nx-card:hover{border-color:var(--nx-accent-line);transform:translateY(-2px)}
.nx-thumb{
	aspect-ratio:16/9;
	background:radial-gradient(90% 120% at 20% 0%,rgba(232,163,61,.22),transparent 60%),var(--nx-surface-3);
	display:grid;place-items:center;border-bottom:1px solid var(--nx-line);
}
.nx-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.nx-thumb span{
	font-family:var(--nx-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--nx-ink-3);
}
.nx-card-in{padding:17px 18px 19px;display:flex;flex-direction:column;gap:11px;flex:1}
.nx-card h3{font-size:16.5px;line-height:1.3}
.nx-st{font-family:var(--nx-mono);font-size:11px;color:var(--nx-ink-3);margin:0;font-variant-numeric:tabular-nums}
.nx-card .nx-bar{width:100%}
.nx-card .nx-bar i{display:block;height:100%;background:var(--nx-accent)}
.nx-card .nx-btn{margin-top:auto;justify-content:center}
.nx-locked{opacity:.62}
.nx-locked .nx-thumb{background:var(--nx-surface-2)}

/* ---------- verificación ---------- */
.nexus-verificar{max-width:560px;margin:0 auto;padding:44px 26px}
.nexus-verificar form{display:flex;gap:9px;flex-wrap:wrap;align-items:flex-end}
.nexus-verificar label{display:block;width:100%;font-size:12.5px;color:var(--nx-ink-2);margin-bottom:7px}
.nexus-verificar input{
	flex:1;min-width:220px;padding:12px 14px;background:var(--nx-surface);
	border:1px solid var(--nx-line);border-radius:var(--nx-r);color:var(--nx-ink);
	font-family:var(--nx-mono);font-size:14px;
}
.nexus-verificar input:focus{outline:none;border-color:var(--nx-accent-line)}
.nexus-verificar button{
	padding:12px 20px;border-radius:var(--nx-r);border:none;cursor:pointer;
	background:var(--nx-accent);color:#1A1206;font-weight:600;font-size:13.5px;font-family:inherit;
}
.nexus-verificar .nexus-ok,
.nexus-verificar .nexus-no{
	margin-top:22px;padding:18px;border-radius:var(--nx-r);border:1px solid var(--nx-line);
	background:var(--nx-surface);color:var(--nx-ink-2);
}
.nexus-verificar .nexus-ok{border-color:rgba(127,176,105,.4);background:var(--nx-done-soft)}
.nexus-verificar .nexus-ok strong{color:var(--nx-done)}
.nexus-verificar p{margin:0 0 8px}
.nexus-verificar p:last-child{margin-bottom:0}