:root{
  color-scheme:dark;
  --bg:#101712; --surface:#172119; --surface-2:#202c22;
  --ink:#eff7f0; --muted:#b8c5bb; --line:#334136;
  --brand:#50d593; --brand-strong:#77e2aa; --brand-soft:#183b2a;
  --sun:#f2c45d; --coral:#ff8a68; --blue:#78a8f3;
  --shadow:0 18px 55px rgba(0,0,0,.25); --radius:22px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:"DM Sans",sans-serif;font-size:16px;line-height:1.6;
  -webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:"Manrope",sans-serif;letter-spacing:-.03em;margin-top:0}
a{color:var(--brand-strong)}

/* ---------- Sidebar ---------- */
#sidebar{position:fixed;inset:0 auto 0 0;width:300px;background:var(--surface);
  border-right:1px solid var(--line);display:flex;flex-direction:column;
  z-index:40;transition:transform .25s ease}
.brand{padding:22px 22px 16px;font-family:"Manrope";font-weight:800;font-size:15px;
  border-bottom:1px solid var(--line)}
.brand span{color:var(--brand-strong)}
#nav{flex:1;overflow-y:auto;padding:14px 12px}
.modulo{margin-bottom:8px}
.modulo-titulo{width:100%;text-align:left;background:none;border:0;color:var(--ink);
  font-family:"Manrope";font-weight:800;font-size:14px;padding:12px 10px;
  border-radius:12px;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.modulo-titulo:hover{background:var(--surface-2)}
.modulo-titulo .n{color:var(--brand-strong);font-size:12px;display:block;font-weight:700}
.modulo-titulo .flecha{color:var(--muted);font-size:12px}
.modulo .progreso{height:5px;background:var(--surface-2);border-radius:3px;margin:0 10px 8px;overflow:hidden}
.modulo .progreso i{display:block;height:100%;background:var(--brand);border-radius:3px;transition:width .3s}
.clases{display:none;padding:2px 4px 8px}
.modulo.abierto .clases{display:block}
.clase-link{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border-radius:12px;
  color:var(--muted);text-decoration:none;font-size:14px;line-height:1.35;border-left:3px solid transparent}
.clase-link:hover{background:var(--surface-2);color:var(--ink)}
.clase-link.activo{background:var(--brand-soft);color:var(--ink);border-left-color:var(--brand)}
.clase-link .cn{font-family:"Manrope";font-weight:800;color:var(--brand-strong);font-size:13px;min-width:22px}
.clase-link .ok{margin-left:auto;color:var(--brand);font-weight:700}
.side-foot{padding:18px 22px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}
#menu-btn{display:none;position:fixed;top:14px;left:14px;z-index:50;background:var(--surface-2);
  color:var(--ink);border:1px solid var(--line);border-radius:12px;font-size:20px;
  width:46px;height:46px;cursor:pointer}
#overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:35}

/* ---------- Contenido ---------- */
#contenido{margin-left:300px;padding:48px clamp(20px,5vw,72px) 90px;max-width:980px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--brand-strong);
  font-weight:800;font-size:14px;margin:0 0 14px}
.eyebrow::before{content:"";width:22px;height:3px;background:var(--brand);border-radius:2px}
#contenido h1{font-size:clamp(30px,4.5vw,46px);line-height:1.08;margin-bottom:10px}
.meta-clase{color:var(--muted);font-size:14px;margin-bottom:28px;display:flex;gap:10px;flex-wrap:wrap}
.meta-clase span{background:var(--surface-2);border:1px solid var(--line);
  border-radius:999px;padding:5px 13px;font-weight:600}
.bloque{margin:34px 0}
.bloque h2{font-size:22px;margin-bottom:14px}
.player{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);
  background:#000;box-shadow:var(--shadow)}
.player video{width:100%;display:block;aspect-ratio:16/9;background:#000}
.audio-box{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.audio-box audio{width:100%}
.articulo{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(22px,4vw,40px)}
.articulo p{margin:0 0 18px;color:#dfe9e0;font-size:17px}
.articulo p:last-child{margin-bottom:0}
.tarea{background:linear-gradient(135deg,var(--brand-soft),var(--surface-2));
  border:1px solid var(--line);border-radius:var(--radius);padding:clamp(22px,4vw,36px)}
.tarea h2{color:var(--brand-strong)}
.tarea ol{margin:0;padding-left:22px;color:#dfe9e0;font-size:16px}
.tarea li{margin-bottom:10px}
.rec-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.rec-card{background:var(--surface);border:1px solid var(--line);border-radius:18px;
  padding:20px;text-decoration:none;color:var(--ink);display:block;transition:transform .15s}
.rec-card:hover{transform:translateY(-2px);border-color:var(--brand)}
.rec-card .ric{font-size:26px;margin-bottom:10px}
.rec-card h3{font-size:16px;margin:0 0 6px}
.rec-card p{margin:0;color:var(--muted);font-size:13px}
.nav-clases{display:flex;justify-content:space-between;gap:14px;margin-top:44px;flex-wrap:wrap}
.btn{background:var(--surface-2);border:1px solid var(--line);color:var(--ink);
  border-radius:14px;padding:13px 22px;font-weight:700;font-size:15px;cursor:pointer;
  text-decoration:none;font-family:"DM Sans"}
.btn:hover{border-color:var(--brand)}
.btn.primario{background:var(--brand);border-color:var(--brand);color:#0d1510}
.btn.primario:hover{background:var(--brand-strong)}
.completada-wrap{margin-top:30px;text-align:center}
.inicio{padding:20px 0}
.inicio h1{font-size:clamp(34px,5.5vw,58px);line-height:1.05;margin-bottom:18px}
.inicio .lead{color:var(--muted);font-size:clamp(16px,2vw,20px);max-width:640px}
.mod-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-top:34px}
.mod-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;text-decoration:none;color:var(--ink);display:block}
.mod-card:hover{border-color:var(--brand)}
.mod-card .mn{color:var(--brand-strong);font-weight:800;font-size:13px;margin-bottom:8px}
.mod-card h3{font-size:22px;margin:0 0 8px}
.mod-card p{margin:0 0 14px;color:var(--muted);font-size:15px}
.mod-card .ir{color:var(--brand-strong);font-weight:700}

@media(max-width:900px){
  #sidebar{transform:translateX(-100%)}
  body.menu-abierto #sidebar{transform:none}
  body.menu-abierto #overlay{display:block}
  #menu-btn{display:block}
  #contenido{margin-left:0;padding-top:76px}
}