:root{--navy:#1F3864;--teal:#0E7C7B;--bg:#f5f7fa;--card:#fff;--txt:#1d2433;--mut:#5b6678;--line:#dde3ec;--ok:#1b7f3b;--okbg:#e8f6ec;--mal:#b3261e;--malbg:#fdecea;--pend:#8a6100;--pendbg:#fff5d6;--r:10px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--txt)}
a{color:var(--teal)}
h1{font-size:1.6rem;color:var(--navy);margin:.4em 0 .5em}
h2{font-size:1.2rem;color:var(--navy);margin:1.4em 0 .5em}
h3{font-size:1.05rem;margin:.2em 0}
h2.bloque{border-bottom:2px solid var(--teal);padding-bottom:.2em}
code{background:#eef1f6;padding:.1em .35em;border-radius:4px}
.top{background:var(--navy);color:#fff;display:flex;flex-wrap:wrap;gap:.6rem 1.2rem;align-items:center;justify-content:space-between;padding:.6rem 1rem}
.top-inst{background:#16294a;border-bottom:3px solid var(--teal)}
.top a,.top .link{color:#fff;text-decoration:none}
.top nav{display:flex;flex-wrap:wrap;gap:.4rem 1rem;align-items:center}
.top nav a:hover,.top .link:hover{text-decoration:underline}
.marca{font-weight:700;font-size:1.1rem}
.marca small{font-weight:400;opacity:.8}
.marca-i{display:inline-block;background:var(--teal);border-radius:6px;padding:0 .4em;margin-right:.3em}
.chip{background:rgba(255,255,255,.15);border-radius:99px;padding:.15rem .7rem;font-size:.9rem}
button.link{background:none;border:0;font:inherit;cursor:pointer;padding:0}
.wrap{max-width:820px;margin:0 auto;padding:1rem 16px 3rem}
.wrap.wide{max-width:1200px}
.pie{text-align:center;color:var(--mut);font-size:.85rem;padding:1.5rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:1rem 1.2rem;margin:1rem 0}
.card.angosto,.angosto{max-width:420px;margin:2rem auto}
.card.centro,.centro{text-align:center}
.hero{text-align:center;padding:1.5rem 0 .5rem}
.dos{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media(max-width:640px){.dos{grid-template-columns:1fr}}
.aviso{border-left:4px solid var(--teal);background:#e6f4f4;padding:.6rem .9rem;border-radius:6px;margin:.8rem 0}
.aviso.error{border-color:var(--mal);background:var(--malbg)}
.aviso.ok{border-color:var(--ok);background:var(--okbg)}
.aviso.info{border-color:var(--navy);background:#e8edf7}
label{display:block;margin:.7rem 0;font-weight:600}
label input,label select,label textarea{display:block;width:100%;margin-top:.25rem;font-weight:400}
input,select,textarea{font:inherit;padding:.5rem .65rem;border:1px solid #b8c2d1;border-radius:8px;background:#fff;color:inherit}
input:focus,select:focus,textarea:focus,button:focus-visible,a:focus-visible{outline:3px solid #7fc4c3;outline-offset:1px}
.btn{display:inline-block;background:var(--teal);color:#fff;border:0;border-radius:8px;padding:.6rem 1.1rem;font:inherit;font-weight:600;cursor:pointer;text-decoration:none}
.btn:hover{filter:brightness(1.08)}
.btn.sec{background:#e3e9f2;color:var(--navy)}
.btn.peligro{background:var(--mal);color:#fff}
.btn.peq{padding:.3rem .7rem;font-size:.9rem}
form.inline{display:inline-flex;flex-wrap:wrap;gap:.4rem;align-items:flex-end}
form.inline label{margin:0}
.nota{color:var(--mut);font-size:.9rem}
.migas{font-size:.9rem;color:var(--mut);margin:.2rem 0}
.titulo-fila{display:flex;flex-wrap:wrap;gap:.6rem 1rem;align-items:center;justify-content:space-between}
.codigo{font-family:ui-monospace,Menlo,Consolas,monospace;letter-spacing:.08em;background:#eef1f6;padding:.05em .45em;border-radius:5px}
.codigo.grande{font-size:1.4rem}
.etq{background:#e3e9f2;color:var(--navy);border-radius:5px;font-size:.75rem;font-weight:600;padding:.1em .5em;vertical-align:middle}
.lista{padding-left:1.2rem}
/* tablas */
.tabla-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.tabla{border-collapse:collapse;width:100%;background:#fff;font-size:.93rem}
.tabla th,.tabla td{border:1px solid var(--line);padding:.4rem .6rem;text-align:left;vertical-align:top}
.tabla th{background:#eef1f6;color:var(--navy)}
.tabla td.num,.tabla th.vert{text-align:center;white-space:nowrap}
.tabla th.vert{font-size:.78rem;max-width:7rem;white-space:normal}
.tabla tr.inactivo{opacity:.6}
.tabla td.bajo{background:var(--malbg);color:var(--mal);font-weight:700}
.tabla tr.ok td{background:var(--okbg)}.tabla tr.mal td{background:var(--malbg)}.tabla tr.pend td{background:var(--pendbg)}.tabla tr.vacio td{color:var(--mut)}
small.pend{color:var(--pend)}
/* panel alumno */
.modulos{list-style:none;padding:0;margin:0;display:grid;gap:.6rem}
.modulo{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:.8rem 1rem;display:flex;flex-wrap:wrap;gap:.4rem 1rem;align-items:center;justify-content:space-between}
.modulo.cerrado{opacity:.55}
.semana h2{margin-top:1.6em}
.recursos a{display:inline-block;margin-right:1rem}
progress{width:100%;max-width:340px;height:14px;accent-color:var(--teal)}
.barra-prog{display:flex;flex-wrap:wrap;gap:.3rem 1rem;align-items:center;position:sticky;top:0;background:var(--bg);padding:.5rem 0;z-index:5}
details.intro{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:.5rem 1rem;margin:.8rem 0}
details summary{cursor:pointer;font-weight:600;color:var(--navy)}
.prosa table{border-collapse:collapse;margin:.6rem 0}.prosa th,.prosa td{border:1px solid var(--line);padding:.3rem .6rem}
.prosa h3{color:var(--navy)}
/* reactivos */
.reactivo{background:#fff;border:1px solid var(--line);border-left:5px solid #b8c2d1;border-radius:var(--r);padding:.9rem 1.1rem;margin:.9rem 0}
.reactivo.ok{border-left-color:var(--ok);background:var(--okbg)}
.reactivo.mal{border-left-color:var(--mal);background:var(--malbg)}
.reactivo.pend{border-left-color:#d9a400;background:var(--pendbg)}
.reactivo.enviada{border-left-color:var(--teal)}
.enun{font-size:1.05rem;margin-bottom:.5rem}
.entrada{margin:.5rem 0}
.entrada input[type=text]{width:100%;max-width:340px}
.entrada textarea{width:100%}
.opc{display:flex;gap:.5rem;align-items:flex-start;font-weight:400;margin:.35rem 0;padding:.3rem .5rem;border-radius:8px;cursor:pointer}
.opc:hover{background:#eef6f6}
.opc input{width:auto;margin:.3rem 0 0}
.acciones{display:flex;flex-wrap:wrap;gap:.4rem 1rem;align-items:center}
.estado{font-weight:600}
.pts{margin-left:auto;color:var(--mut);font-size:.85rem}
.pista{color:var(--mal);margin:.4rem 0 0}
.retro{background:#fff;border:1px dashed #9fb0c8;border-radius:8px;padding:.5rem .8rem;margin:.6rem 0 0}
.error{color:var(--mal);font-weight:600;margin:.4rem 0 0;min-height:0}
.error:empty{display:none}
.vista{margin-left:.7rem;font-size:1.1rem;color:var(--navy)}
blockquote.resp-alumno{background:#eef1f6;border-left:4px solid var(--navy);margin:.6rem 0;padding:.5rem .9rem;border-radius:6px}
/* fracciones apiladas */
.frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;text-align:center;margin:0 .15em;line-height:1.15;font-size:.95em}
.frac .n{border-bottom:1.5px solid currentColor;padding:0 .25em}
.frac .d{padding:0 .25em}
/* barras */
.barra{display:flex;max-width:420px;height:34px;border:2px solid var(--navy);border-radius:6px;overflow:hidden;margin:.5rem 0}
.barra .parte{flex:1;border:0;border-right:1.5px solid var(--navy);background:#fff;padding:0;margin:0;border-radius:0}
.barra .parte:last-child{border-right:0}
.barra .parte.on{background:var(--teal)}
.barra-int .parte{cursor:pointer}
.barra-int .parte:hover{background:#bfe3e2}
.barra-int .parte.on:hover{background:#0b6564}
/* pared */
.pared{margin:1rem 0}
.pared .fila{display:flex;align-items:stretch;gap:.5rem;margin:.25rem 0}
.pared .rot{width:5.6rem;flex:none;font-size:.82rem;color:var(--mut);align-self:center}
.pared .celdas{display:flex;flex:1}
.pared .celda{flex:1;min-height:42px;border:1.5px solid var(--navy);border-right-width:0;background:#fff;font:inherit;font-size:.78rem;color:var(--navy);cursor:pointer;padding:0}
.pared .celda:last-child{border-right-width:1.5px}
.pared .celda.on{background:var(--teal);color:#fff}
@media print{.top,.pie,.btn,form{display:none}body{background:#fff}}
/* guías de clase del instructor */
.resumenes{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1rem;margin:.6rem 0}
.resumenes figure{margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:.6rem}
.resumenes img{width:100%;height:auto;display:block;border-radius:6px}
.resumenes figcaption{font-size:.85rem;color:var(--mut);margin-top:.4rem}
details.guia>summary{font-size:1.05rem}
details.guia .prosa{margin-top:.6rem}
details.guia .prosa h4{color:var(--navy);margin:1.1em 0 .3em}