:root{--fondo:#0b0f0d;--panel:#121a16;--borde:#1f2b25;--texto:#e9f2ec;--suave:#a9b8b0;--verde:#25d366;--verde2:#1aa34f;--rojo:#ff5a5f;--ambar:#ffb020;--radio:14px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--fondo);color:var(--texto);font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}
a{color:var(--verde)}
img{max-width:100%;height:auto;border-radius:10px}
.env{max-width:1060px;margin:0 auto;padding:0 16px}
.angosto{max-width:760px}
header.barra{position:sticky;top:0;z-index:5;background:rgba(11,15,13,.92);backdrop-filter:blur(6px);border-bottom:1px solid var(--borde)}
header.barra .env{display:flex;align-items:center;justify-content:space-between;height:58px}
.marca{font-weight:800;letter-spacing:.3px;color:var(--texto);text-decoration:none;display:flex;gap:8px;align-items:center}
.marca b{color:var(--verde)}
.marca img{width:30px;height:30px;border-radius:8px}
.btn{display:inline-block;background:var(--verde);color:#04120a;font-weight:800;padding:14px 22px;border-radius:12px;text-decoration:none;border:0;cursor:pointer;font-size:16px;text-align:center}
.btn:hover{background:#2be070}
.btn.sec{background:transparent;color:var(--texto);border:1px solid var(--borde)}
.btn.chico{padding:9px 14px;font-size:14px}
.hero{padding:56px 0 36px}
.hero h1{font-size:clamp(30px,5.4vw,52px);line-height:1.08;margin:0 0 16px;letter-spacing:-.5px}
.hero p.sub{font-size:clamp(17px,2.2vw,20px);color:var(--suave);max-width:720px}
.hero .acciones{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:32px;align-items:center}
@media(max-width:820px){.hero-grid{grid-template-columns:1fr}}
.etiqueta{display:inline-block;font-size:13px;font-weight:700;color:var(--verde);background:rgba(37,211,102,.1);border:1px solid rgba(37,211,102,.3);padding:4px 10px;border-radius:999px;margin-bottom:14px}
section{padding:44px 0;border-top:1px solid var(--borde)}
h2{font-size:clamp(24px,3.6vw,34px);line-height:1.15;margin:0 0 18px}
.rejilla{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px}
.tarjeta{background:var(--panel);border:1px solid var(--borde);border-radius:var(--radio);padding:20px}
.tarjeta h3{margin:0 0 8px;font-size:19px}
.dolor{border-left:4px solid var(--rojo)}
.dolor h3{color:#ffd6d7}
.num{font-size:30px;font-weight:800;color:var(--verde)}
.num.rojo{color:var(--rojo)}
.chico{font-size:13px;color:var(--suave)}
table{width:100%;border-collapse:collapse;font-size:15px;margin:14px 0}
th,td{padding:10px 8px;border-bottom:1px solid var(--borde);text-align:left;vertical-align:top}
th{color:var(--suave);font-weight:600}
.tabla-scroll{overflow-x:auto}
.si{color:var(--verde);font-weight:700}.no{color:var(--rojo);font-weight:700}
.plan{display:flex;flex-direction:column}
.plan .precio{font-size:40px;font-weight:800;margin:6px 0}
.plan .precio small{font-size:16px;color:var(--suave);font-weight:500}
.plan ul{padding-left:18px;flex:1}
.plan.destacado{border:2px solid var(--verde);position:relative}
.plan.destacado:before{content:"El más elegido";position:absolute;top:-12px;left:18px;background:var(--verde);color:#04120a;font-size:12px;font-weight:800;padding:3px 10px;border-radius:999px}
details{background:var(--panel);border:1px solid var(--borde);border-radius:12px;padding:14px 16px;margin:10px 0}
summary{cursor:pointer;font-weight:700}
.modulo{margin:10px 0}
.modulo h3{margin:0 0 4px}
footer{padding:30px 0 90px;color:var(--suave);font-size:13px;border-top:1px solid var(--borde)}
.aviso{background:rgba(255,176,32,.08);border:1px solid rgba(255,176,32,.35);padding:12px 14px;border-radius:12px;margin:12px 0}
/* chat flotante */
#chat-boton{position:fixed;right:16px;bottom:16px;z-index:20;background:var(--verde);color:#04120a;border-radius:999px;padding:14px 18px;font-weight:800;box-shadow:0 8px 24px rgba(0,0,0,.4);text-decoration:none;border:0;cursor:pointer;font-size:15px}
#chat-caja{position:fixed;right:16px;bottom:78px;z-index:21;width:min(380px,calc(100vw - 32px));height:min(560px,calc(100vh - 110px));background:var(--panel);border:1px solid var(--borde);border-radius:16px;display:none;flex-direction:column;overflow:hidden;box-shadow:0 12px 40px rgba(0,0,0,.5)}
#chat-caja.abierto{display:flex}
.chat-cab{padding:12px 14px;border-bottom:1px solid var(--borde);display:flex;justify-content:space-between;align-items:center}
.chat-cab b{display:block}
.chat-msgs{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:8px;background:#0e1411}
.burbuja{max-width:85%;padding:9px 12px;border-radius:12px;white-space:pre-wrap;word-wrap:break-word;font-size:15px}
.burbuja.bot{background:#1d2a23;align-self:flex-start;border-top-left-radius:4px}
.burbuja.yo{background:#11532f;align-self:flex-end;border-top-right-radius:4px}
.burbuja a{color:#7dffb0;word-break:break-all}
.chat-pie{display:flex;gap:8px;padding:10px;border-top:1px solid var(--borde)}
.chat-pie input{flex:1;background:#0b0f0d;border:1px solid var(--borde);color:var(--texto);border-radius:10px;padding:11px;font-size:16px}
.escribiendo{font-size:13px;color:var(--suave);padding:0 12px 6px}
/* aula */
.aula-grid{display:grid;grid-template-columns:280px 1fr;gap:24px;padding:24px 0}
@media(max-width:820px){.aula-grid{grid-template-columns:1fr}}
.menu a{display:block;padding:8px 10px;border-radius:8px;text-decoration:none;color:var(--texto)}
.menu a:hover,.menu a.activo{background:var(--panel)}
.leccion-lista a{display:flex;justify-content:space-between;gap:10px;padding:9px 10px;border-radius:8px;text-decoration:none;color:var(--texto)}
.leccion-lista a:hover{background:#17221c}
.leccion-lista .candado{color:var(--suave)}
.barra-avance{height:8px;background:var(--borde);border-radius:99px;overflow:hidden}
.barra-avance i{display:block;height:100%;background:var(--verde)}
.contenido h2{margin-top:28px}
.contenido pre{background:#0e1411;border:1px solid var(--borde);padding:14px;border-radius:10px;overflow-x:auto;font-size:14px;white-space:pre-wrap}
.contenido blockquote{border-left:4px solid var(--verde);margin:14px 0;padding:8px 14px;background:var(--panel);border-radius:0 10px 10px 0}
.contenido code{background:#16201b;padding:1px 6px;border-radius:6px}
form.campos input,form.campos textarea,form.campos select{width:100%;background:#0b0f0d;border:1px solid var(--borde);color:var(--texto);border-radius:10px;padding:12px;font-size:16px;margin:6px 0 12px;font-family:inherit}
.post{background:var(--panel);border:1px solid var(--borde);border-radius:12px;padding:16px;margin:12px 0}
.post .meta{font-size:13px;color:var(--suave)}
.respuesta{border-left:2px solid var(--borde);padding:6px 12px;margin:8px 0}
.btn{font-family:inherit}
@media(max-width:820px){.aula-grid{gap:8px;padding-top:10px}.menu{display:flex;overflow-x:auto;gap:4px;border-bottom:1px solid var(--borde);padding-bottom:6px}.menu a{white-space:nowrap;font-size:14px}.menu p{display:none}}
.aula-grid>*{min-width:0}
.contenido table{display:block;overflow-x:auto}
.contenido img{max-width:100%}
.prueba-hero{margin-top:14px;padding:10px 14px;border:1px solid rgba(37,211,102,.35);border-radius:12px;background:rgba(37,211,102,.07);font-size:15px}
.capturas figure{margin:0;padding:12px}
.capturas img{width:100%;border-radius:10px}
.capturas figcaption{font-size:14px;color:var(--suave);margin-top:8px}