/* ===================================================================
   Curso de JavaScript Moderno - Sistema de diseno
   Un unico archivo de estilos para el portal y las 14 unidades.
   =================================================================== */

/* ---------- 1. Tokens ---------- */
:root{
  --bg:            #f6f7fb;
  --bg-alt:        #eceef6;
  --surface:       #ffffff;
  --surface-2:     #f2f4fa;
  --text:          #1c2033;
  --text-soft:     #4a5270;
  --muted:         #6b7394;
  --border:        #dfe3ee;
  --border-strong: #c6ccdf;

  --accent:        #f0b400;
  --accent-ink:    #3d2f00;
  --accent-soft:   #fff6d9;
  --brand:         #4f46e5;
  --brand-soft:    #eef0ff;
  --ok:            #0f7b4f;
  --ok-soft:       #e4f6ed;
  --warn:          #9a5b00;
  --warn-soft:     #fdf0dc;
  --err:           #b3261e;
  --err-soft:      #fdeceb;

  --code-bg:       #161b2e;
  --code-bg-2:     #10152a;
  --code-text:     #e6e9f5;
  --code-line:     #2b3252;

  --radius:   14px;
  --radius-s: 9px;
  --shadow:   0 1px 2px rgba(20,25,60,.05), 0 8px 24px rgba(20,25,60,.06);
  --shadow-l: 0 2px 6px rgba(20,25,60,.07), 0 18px 48px rgba(20,25,60,.10);

  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Fira Code", Consolas, "Liberation Mono", monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --maxw: 1240px;
  --read: 74ch;
}

html[data-tema="oscuro"]{
  --bg:            #0d1120;
  --bg-alt:        #0a0e1a;
  --surface:       #151a2d;
  --surface-2:     #1c2239;
  --text:          #e8ebf7;
  --text-soft:     #b9c0da;
  --muted:         #8f98bb;
  --border:        #262d47;
  --border-strong: #39426a;

  --accent:        #ffd44d;
  --accent-ink:    #2a2100;
  --accent-soft:   #2e2708;
  --brand:         #8b8bff;
  --brand-soft:    #1f2246;
  --ok:            #56d39a;
  --ok-soft:       #10301f;
  --warn:          #f0b969;
  --warn-soft:     #33240d;
  --err:           #ff8a80;
  --err-soft:      #3a1512;

  --code-bg:       #0b0f1e;
  --code-bg-2:     #080c18;
  --code-line:     #222a47;

  --shadow:   0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
  --shadow-l: 0 2px 6px rgba(0,0,0,.45), 0 18px 48px rgba(0,0,0,.45);
}

*,*::before,*::after{ box-sizing:border-box; }

html{ scroll-behavior:smooth; scroll-padding-top:84px; }
@media (prefers-reduced-motion:reduce){ html{ scroll-behavior:auto; } }

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--sans);
  font-size:16.5px;
  line-height:1.72;
  -webkit-font-smoothing:antialiased;
  display:flex;
  flex-direction:column;
  min-height:100vh;
}

img{ max-width:100%; height:auto; display:block; }
a{ color:var(--brand); }
:focus-visible{ outline:3px solid var(--brand); outline-offset:2px; border-radius:4px; }

.saltar{
  position:absolute; left:-9999px; top:0; background:var(--brand); color:#fff;
  padding:.7rem 1.1rem; z-index:100; border-radius:0 0 var(--radius-s) 0; font-weight:600;
}
.saltar:focus{ left:0; }

/* ---------- 2. Barra superior ---------- */
.topbar{
  position:sticky; top:0; z-index:40;
  background:var(--surface);
  border-bottom:1px solid var(--border);
}
.topbar-in{
  max-width:var(--maxw); margin:0 auto; padding:.6rem 20px;
  display:flex; align-items:center; gap:1rem; flex-wrap:wrap;
}
.marca{
  display:flex; align-items:center; gap:.6rem;
  font-weight:800; letter-spacing:-.02em; color:var(--text); text-decoration:none; flex:0 0 auto;
}
.marca-logo{
  width:32px; height:32px; border-radius:8px; background:var(--accent); color:var(--accent-ink);
  display:grid; place-items:center; font-family:var(--mono); font-weight:800; font-size:.86rem; flex:none;
}
.marca span{ font-size:.95rem; }
.marca small{ display:block; font-weight:500; font-size:.68rem; color:var(--muted); letter-spacing:.06em; text-transform:uppercase; }
.topbar-sp{ flex:1 1 auto; }

.migas{ font-size:.83rem; color:var(--muted); display:flex; gap:.45rem; align-items:center; flex-wrap:wrap; min-width:0; }
.migas a{ color:var(--muted); text-decoration:none; }
.migas a:hover{ color:var(--brand); text-decoration:underline; }
.migas b{ color:var(--text); font-weight:600; }

.btn-icono{
  border:1px solid var(--border); background:var(--surface); color:var(--text-soft);
  width:38px; height:38px; border-radius:10px; display:grid; place-items:center;
  cursor:pointer; font-size:1rem; flex:none; transition:.15s;
}
.btn-icono:hover{ border-color:var(--brand); color:var(--brand); }

/* ---------- 3. Barra de progreso de lectura ---------- */
.lectura{ position:sticky; top:54px; z-index:39; height:3px; background:transparent; }
.lectura i{ display:block; height:100%; width:0; background:linear-gradient(90deg,var(--accent),var(--brand)); transition:width .1s linear; }

/* ---------- 4. Layout ---------- */
.envoltura{ max-width:var(--maxw); margin:0 auto; padding-inline:20px; }

.layout{
  max-width:var(--maxw); margin:0 auto; padding-inline:20px;
  display:grid; grid-template-columns:255px minmax(0,1fr); gap:2.6rem; align-items:start;
  width:100%;
}
.sidebar{ position:sticky; top:88px; padding-block:2rem; max-height:calc(100vh - 100px); overflow-y:auto; }
.sidebar h2{ font-size:.72rem; text-transform:uppercase; letter-spacing:.1em; color:var(--muted); margin:0 0 .7rem; }
.toc{ list-style:none; margin:0 0 1.6rem; padding:0; border-left:2px solid var(--border); }
.toc li{ margin:0; }
.toc a{
  display:block; padding:.34rem .8rem; font-size:.86rem; color:var(--text-soft);
  text-decoration:none; border-left:2px solid transparent; margin-left:-2px; line-height:1.4;
}
.toc a:hover{ color:var(--brand); }
.toc a.activo{ color:var(--brand); border-left-color:var(--brand); font-weight:600; background:var(--brand-soft); border-radius:0 6px 6px 0; }

main{ padding-block:2rem 4rem; min-width:0; }

@media (max-width:960px){
  .layout{ grid-template-columns:1fr; gap:0; }
  .sidebar{ position:static; max-height:none; padding-block:1.4rem 0; }
  .toc{ display:flex; flex-wrap:wrap; gap:.3rem; border-left:0; background:var(--surface); padding:.7rem; border-radius:var(--radius); border:1px solid var(--border); }
  .toc a{ border-left:0; padding:.25rem .6rem; border-radius:20px; background:var(--surface-2); font-size:.8rem; margin-left:0; }
  .toc a.activo{ border-radius:20px; }
  .lectura{ top:0; }
}

/* ---------- 5. Tipografia de contenido ---------- */
h1,h2,h3,h4{ line-height:1.22; letter-spacing:-.02em; margin:0; }
main h2{
  font-size:clamp(1.45rem,3.2vw,1.85rem); margin:3.4rem 0 1rem; padding-top:.4rem;
  display:flex; align-items:baseline; gap:.6rem; flex-wrap:wrap;
}
main h2 .num{
  font-family:var(--mono); font-size:.72rem; font-weight:700; color:var(--brand);
  background:var(--brand-soft); padding:.22rem .5rem; border-radius:6px; letter-spacing:.04em; flex:none;
}
main h3{ font-size:1.16rem; margin:2.1rem 0 .6rem; }
main h4{ font-size:.98rem; margin:1.5rem 0 .4rem; color:var(--text-soft); }
main p{ margin:0 0 1rem; max-width:var(--read); }
main ul,main ol{ max-width:var(--read); margin:0 0 1.15rem; padding-left:1.35rem; }
main li{ margin-bottom:.42rem; }
main li::marker{ color:var(--brand); }
strong{ font-weight:650; }
main section{ scroll-margin-top:90px; }

code{
  font-family:var(--mono); font-size:.875em;
  background:var(--surface-2); border:1px solid var(--border);
  padding:.12em .38em; border-radius:5px; color:var(--text);
  word-break:break-word;
}
h2 code,h3 code{ font-size:.9em; }
kbd{
  font-family:var(--mono); font-size:.78em; background:var(--surface-2);
  border:1px solid var(--border-strong); border-bottom-width:2px;
  padding:.1em .4em; border-radius:5px;
}

/* ---------- 6. Portada de unidad ---------- */
.hero-unidad{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:1.9rem; box-shadow:var(--shadow); position:relative; overflow:hidden;
}
.hero-unidad::before{
  content:""; position:absolute; inset:0 auto 0 0; width:5px;
  background:linear-gradient(180deg,var(--accent),var(--brand));
}
.hero-etq{
  font-family:var(--mono); font-size:.74rem; font-weight:700; letter-spacing:.1em;
  text-transform:uppercase; color:var(--brand); margin:0 0 .5rem;
}
.hero-unidad h1{ font-size:clamp(1.7rem,4.6vw,2.5rem); margin:0 0 .8rem; }
.hero-unidad > p{ color:var(--text-soft); font-size:1.03rem; max-width:68ch; }
.meta-unidad{
  display:flex; gap:1.4rem; flex-wrap:wrap; margin-top:1.2rem; padding-top:1.1rem;
  border-top:1px solid var(--border); font-size:.83rem; color:var(--muted);
}
.meta-unidad span{ display:flex; align-items:center; gap:.4rem; }

/* ---------- 7. Bloques didacticos ---------- */
.caja{
  border:1px solid var(--border); border-left:4px solid var(--brand);
  background:var(--surface); border-radius:var(--radius-s);
  padding:1.05rem 1.2rem; margin:1.5rem 0; max-width:var(--read); box-shadow:var(--shadow);
}
.caja > :last-child{ margin-bottom:0; }
.caja > .caja-t + *{ margin-top:0; }
.caja-t{ font-weight:700; font-size:.82rem; text-transform:uppercase; letter-spacing:.07em; margin:0 0 .45rem; display:flex; align-items:center; gap:.45rem; }

.caja.objetivo{ border-left-color:var(--brand); background:var(--brand-soft); }
.caja.objetivo .caja-t{ color:var(--brand); }
.caja.clave{ border-left-color:var(--accent); background:var(--accent-soft); }
.caja.clave .caja-t{ color:var(--warn); }
.caja.aviso{ border-left-color:var(--warn); background:var(--warn-soft); }
.caja.aviso .caja-t{ color:var(--warn); }
.caja.error{ border-left-color:var(--err); background:var(--err-soft); }
.caja.error .caja-t{ color:var(--err); }
.caja.ok{ border-left-color:var(--ok); background:var(--ok-soft); }
.caja.ok .caja-t{ color:var(--ok); }
.caja.ampliacion{ border-left-color:var(--muted); background:var(--surface-2); }
.caja.ampliacion .caja-t{ color:var(--muted); }
.caja.entrevista{ border-left-color:#8b5cf6; background:var(--surface-2); }
.caja.entrevista .caja-t{ color:#7c3aed; }
html[data-tema="oscuro"] .caja.entrevista .caja-t{ color:#c4b5fd; }

/* Conceptos clave en rejilla */
.conceptos{ display:grid; grid-template-columns:repeat(auto-fit,minmax(215px,1fr)); gap:.9rem; margin:1.4rem 0 1.8rem; }
.concepto{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-s);
  padding:.95rem 1rem; box-shadow:var(--shadow); margin:0;
}
.concepto dt{ font-family:var(--mono); font-weight:700; font-size:.88rem; color:var(--brand); margin-bottom:.3rem; word-break:break-word; }
.concepto dd{ margin:0; font-size:.88rem; color:var(--text-soft); line-height:1.6; }

/* ---------- 8. Codigo ---------- */
.bloque-codigo{ margin:1.35rem 0 1.6rem; border-radius:var(--radius-s); overflow:hidden; border:1px solid var(--code-line); box-shadow:var(--shadow); background:var(--code-bg); }
.codigo-barra{
  display:flex; align-items:center; gap:.6rem; padding:.42rem .55rem .42rem .9rem;
  background:var(--code-bg-2); border-bottom:1px solid var(--code-line);
}
.codigo-titulo{ font-family:var(--mono); font-size:.74rem; color:#8e98c4; letter-spacing:.03em; flex:1 1 auto; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.codigo-btn{
  font-family:var(--sans); font-size:.73rem; font-weight:600; color:#b9c2e6;
  background:rgba(255,255,255,.07); border:1px solid rgba(255,255,255,.12);
  padding:.28rem .6rem; border-radius:6px; cursor:pointer; flex:none; transition:.15s; white-space:nowrap;
}
.codigo-btn:hover{ background:rgba(255,255,255,.16); color:#fff; }
.codigo-btn.hecho{ background:#0f7b4f; border-color:#0f7b4f; color:#fff; }
pre{ margin:0; padding:1rem 1.1rem; overflow-x:auto; background:var(--code-bg); }
pre code{
  background:none; border:0; padding:0; color:var(--code-text);
  font-family:var(--mono); font-size:.855rem; line-height:1.75; display:block; white-space:pre;
}
.tk-com{ color:#7f8bb5; font-style:italic; }
.tk-str{ color:#9ee493; }
.tk-num{ color:#f6b98a; }
.tk-key{ color:#c792ea; }
.tk-lit{ color:#f78c6c; }
.tk-fun{ color:#82aaff; }
.tk-glo{ color:#ffcb6b; }
.tk-op{  color:#89ddff; }

.salida{
  background:var(--code-bg-2); border-top:1px solid var(--code-line);
  padding:.7rem 1.1rem; font-family:var(--mono); font-size:.8rem; color:#c9d1f0; line-height:1.7;
}
.salida .et{ color:#7f8bb5; font-size:.7rem; text-transform:uppercase; letter-spacing:.09em; display:block; margin-bottom:.3rem; }
.salida .ln{ display:block; white-space:pre-wrap; word-break:break-word; }
.salida .ln.err{ color:#ff8b9e; }
.salida .ln.vacio{ color:#7f8bb5; font-style:italic; }

.comparar{ display:grid; grid-template-columns:repeat(auto-fit,minmax(290px,1fr)); gap:1rem; margin:1.4rem 0; }
.comparar .bloque-codigo{ margin:0; }

/* ---------- 9. Tabla ---------- */
.tabla-wrap{ overflow-x:auto; margin:1.4rem 0 1.7rem; border:1px solid var(--border); border-radius:var(--radius-s); background:var(--surface); box-shadow:var(--shadow); }
table{ border-collapse:collapse; width:100%; min-width:480px; font-size:.89rem; }
th,td{ text-align:left; padding:.68rem .9rem; border-bottom:1px solid var(--border); vertical-align:top; }
thead th{ background:var(--surface-2); font-size:.75rem; text-transform:uppercase; letter-spacing:.06em; color:var(--muted); font-weight:700; }
tbody tr:last-child td{ border-bottom:0; }
td code{ white-space:nowrap; }

/* ---------- 10. Acordeon ---------- */
details.acordeon{
  border:1px solid var(--border); border-radius:var(--radius-s); background:var(--surface);
  margin:1rem 0 1.5rem; overflow:hidden; box-shadow:var(--shadow);
}
details.acordeon > summary{
  cursor:pointer; padding:.8rem 1.1rem; font-weight:650; font-size:.92rem;
  list-style:none; display:flex; align-items:center; gap:.6rem; color:var(--text);
  background:var(--surface-2); user-select:none;
}
details.acordeon > summary::-webkit-details-marker{ display:none; }
details.acordeon > summary::before{
  content:"\25B8"; color:var(--brand); font-size:.9rem; transition:transform .15s; flex:none;
}
details.acordeon[open] > summary::before{ transform:rotate(90deg); }
details.acordeon > summary:hover{ color:var(--brand); }
.acordeon-cuerpo{ padding:1rem 1.1rem .4rem; border-top:1px solid var(--border); }

/* ---------- 11. Pestanas ---------- */
.pestanas{ margin:1.4rem 0 1.7rem; }
.pestanas-nav{ display:flex; gap:.3rem; flex-wrap:wrap; border-bottom:2px solid var(--border); }
.pestanas-nav button{
  font:inherit; font-size:.86rem; font-weight:600; color:var(--muted); background:none; border:0;
  border-bottom:2px solid transparent; margin-bottom:-2px; padding:.55rem .85rem; cursor:pointer; transition:.15s;
}
.pestanas-nav button:hover{ color:var(--text); }
.pestanas-nav button[aria-selected="true"]{ color:var(--brand); border-bottom-color:var(--brand); }
.pestanas-panel{ padding-top:1rem; }
.pestanas-panel[hidden]{ display:none; }

/* ---------- 12. Ejercicios y retos ---------- */
.ejercicio{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:1.2rem 1.3rem; margin:1.3rem 0; box-shadow:var(--shadow); position:relative;
}
.ejercicio-etq{
  display:inline-flex; align-items:center; gap:.35rem; font-size:.7rem; font-weight:700;
  text-transform:uppercase; letter-spacing:.08em; color:var(--brand); background:var(--brand-soft);
  padding:.22rem .55rem; border-radius:20px; margin-bottom:.6rem;
}
.ejercicio-etq.reto{ color:var(--warn); background:var(--accent-soft); }
.ejercicio h3,.ejercicio h4{ margin-top:0; }
.ejercicio > :last-child{ margin-bottom:0; }

/* ---------- 13. Quiz ---------- */
.quiz{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:1.2rem 1.3rem; margin:1.3rem 0; box-shadow:var(--shadow); }
.quiz-p{ font-weight:650; margin:0 0 .8rem; max-width:var(--read); }
.quiz-ops{ list-style:none; margin:0; padding:0; display:grid; gap:.45rem; max-width:var(--read); }
.quiz-ops li{ margin:0; }
.quiz-op{
  width:100%; text-align:left; font:inherit; font-size:.91rem; color:var(--text);
  background:var(--surface-2); border:1px solid var(--border); border-radius:var(--radius-s);
  padding:.6rem .85rem; cursor:pointer; transition:.14s; display:flex; gap:.6rem; align-items:flex-start;
}
.quiz-op:hover:not(:disabled){ border-color:var(--brand); background:var(--brand-soft); }
.quiz-op:disabled{ cursor:default; }
.quiz-op .marca-op{ font-family:var(--mono); font-weight:700; color:var(--muted); flex:none; }
.quiz-op.bien{ border-color:var(--ok); background:var(--ok-soft); }
.quiz-op.bien .marca-op{ color:var(--ok); }
.quiz-op.mal{ border-color:var(--err); background:var(--err-soft); }
.quiz-op.mal .marca-op{ color:var(--err); }
.quiz-fb{ margin:.85rem 0 0; font-size:.89rem; padding:.65rem .85rem; border-radius:var(--radius-s); max-width:var(--read); }
.quiz-fb[hidden]{ display:none; }
.quiz-fb.bien{ background:var(--ok-soft); color:var(--ok); border:1px solid var(--ok); }
.quiz-fb.mal{ background:var(--err-soft); color:var(--err); border:1px solid var(--err); }

/* ---------- 14. Resumen ---------- */
.resumen{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:1.4rem 1.5rem; box-shadow:var(--shadow); margin:1.4rem 0; }
.resumen ul{ margin:0; padding-left:1.2rem; max-width:none; }
.resumen li{ margin-bottom:.5rem; }

.checklist{ list-style:none; padding:0; margin:1rem 0; max-width:var(--read); }
.checklist li{ margin:0 0 .4rem; }
.checklist label{ display:flex; gap:.65rem; align-items:flex-start; cursor:pointer; font-size:.93rem; padding:.5rem .7rem; border:1px solid var(--border); border-radius:var(--radius-s); background:var(--surface); transition:.14s; }
.checklist label:hover{ border-color:var(--brand); }
.checklist input{ margin-top:.35rem; accent-color:var(--brand); width:16px; height:16px; flex:none; }
.checklist input:checked + span{ color:var(--muted); text-decoration:line-through; }

/* ---------- 15. Navegacion entre unidades ---------- */
.nav-unidad{ display:grid; grid-template-columns:1fr auto 1fr; gap:.8rem; margin-top:3.5rem; padding-top:1.8rem; border-top:1px solid var(--border); align-items:stretch; }
.nav-unidad a{
  display:flex; flex-direction:column; justify-content:center; gap:.15rem; text-decoration:none;
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:.85rem 1.1rem; color:var(--text); transition:.15s; box-shadow:var(--shadow);
}
.nav-unidad a:hover{ border-color:var(--brand); transform:translateY(-2px); box-shadow:var(--shadow-l); }
.nav-unidad .et{ font-size:.7rem; text-transform:uppercase; letter-spacing:.08em; color:var(--muted); }
.nav-unidad .ti{ font-weight:650; font-size:.92rem; line-height:1.35; }
.nav-unidad .sig{ text-align:right; }
.nav-unidad .indice{ justify-content:center; align-items:center; text-align:center; font-size:.85rem; font-weight:600; color:var(--brand); background:var(--brand-soft); border-color:transparent; }
.nav-unidad .vacio{ visibility:hidden; }
@media (max-width:700px){
  .nav-unidad{ grid-template-columns:1fr; }
  .nav-unidad .sig{ text-align:left; }
  .nav-unidad .vacio{ display:none; }
}

/* ---------- 16. Portal ---------- */
.portada{ background:var(--bg-alt); border-bottom:1px solid var(--border); }
.portada-in{ max-width:var(--maxw); margin:0 auto; padding:clamp(2.6rem,7vw,4.8rem) 20px clamp(2.2rem,5vw,3.4rem); }
.portada h1{ font-size:clamp(2.1rem,6.2vw,3.5rem); margin:.6rem 0 1rem; max-width:17ch; }
.portada h1 em{ font-style:normal; color:var(--brand); }
.portada .lede{ font-size:clamp(1rem,2.2vw,1.16rem); color:var(--text-soft); max-width:62ch; margin:0 0 1.8rem; }
.pill{
  display:inline-flex; align-items:center; gap:.45rem; font-family:var(--mono); font-size:.74rem;
  font-weight:700; letter-spacing:.08em; text-transform:uppercase; color:var(--accent-ink);
  background:var(--accent); padding:.3rem .7rem; border-radius:20px;
}
.cta{ display:flex; gap:.7rem; flex-wrap:wrap; }
.btn{
  display:inline-flex; align-items:center; gap:.5rem; font-weight:650; font-size:.94rem;
  padding:.72rem 1.25rem; border-radius:10px; text-decoration:none; border:1px solid transparent; transition:.15s; cursor:pointer;
}
.btn-1{ background:var(--brand); color:#fff; box-shadow:var(--shadow); }
.btn-1:hover{ filter:brightness(1.1); transform:translateY(-1px); box-shadow:var(--shadow-l); }
.btn-2{ background:var(--surface); color:var(--text); border-color:var(--border-strong); }
.btn-2:hover{ border-color:var(--brand); color:var(--brand); }

.cifras{ display:grid; grid-template-columns:repeat(auto-fit,minmax(130px,1fr)); gap:1rem; margin-top:2.4rem; }
.cifra{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:1rem 1.1rem; box-shadow:var(--shadow); }
.cifra b{ display:block; font-size:1.7rem; line-height:1.1; letter-spacing:-.03em; }
.cifra span{ font-size:.79rem; color:var(--muted); }

.seccion{ padding-block:clamp(2.4rem,6vw,4rem); }
.seccion-t{ font-size:clamp(1.4rem,3.4vw,1.9rem); margin:0 0 .5rem; }
.seccion-s{ color:var(--text-soft); max-width:64ch; margin:0 0 2rem; }

.progreso-global{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:1.1rem 1.3rem; margin-bottom:2rem; box-shadow:var(--shadow); }
.progreso-cab{ display:flex; justify-content:space-between; align-items:baseline; gap:1rem; flex-wrap:wrap; margin-bottom:.6rem; }
.progreso-cab strong{ font-size:.95rem; }
.progreso-cab span{ font-size:.83rem; color:var(--muted); }
.barra{ height:9px; background:var(--surface-2); border-radius:20px; overflow:hidden; border:1px solid var(--border); }
.barra i{ display:block; height:100%; width:0; background:linear-gradient(90deg,var(--accent),var(--brand)); border-radius:20px; transition:width .45s ease; }
.progreso-global button{ margin-top:.8rem; font-size:.78rem; background:none; border:0; color:var(--muted); cursor:pointer; text-decoration:underline; padding:0; }
.progreso-global button:hover{ color:var(--err); }

.unidades{ display:grid; grid-template-columns:repeat(auto-fill,minmax(290px,1fr)); gap:1.1rem; }
.tarjeta{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:1.2rem 1.3rem 1.3rem; text-decoration:none; color:var(--text); display:flex; flex-direction:column;
  box-shadow:var(--shadow); transition:.16s; position:relative; overflow:hidden;
}
.tarjeta::after{ content:""; position:absolute; inset:0 0 auto 0; height:3px; background:linear-gradient(90deg,var(--accent),var(--brand)); opacity:0; transition:.16s; }
.tarjeta:hover{ transform:translateY(-3px); box-shadow:var(--shadow-l); border-color:var(--border-strong); }
.tarjeta:hover::after{ opacity:1; }
.tarjeta-cab{ display:flex; align-items:center; gap:.7rem; margin-bottom:.7rem; }
.tarjeta-n{
  font-family:var(--mono); font-weight:800; font-size:.82rem; color:var(--brand);
  background:var(--brand-soft); width:34px; height:34px; border-radius:9px; display:grid; place-items:center; flex:none;
}
.tarjeta.hecha .tarjeta-n{ background:var(--ok-soft); color:var(--ok); }
.tarjeta h3{ font-size:1rem; margin:0; line-height:1.3; flex:1 1 auto; }
.tarjeta p{ font-size:.875rem; color:var(--text-soft); margin:0 0 .9rem; flex:1 1 auto; line-height:1.6; }
.tarjeta-pie{ display:flex; gap:.5rem; flex-wrap:wrap; align-items:center; font-size:.74rem; color:var(--muted); }
.etq{ background:var(--surface-2); border:1px solid var(--border); border-radius:20px; padding:.15rem .55rem; font-family:var(--mono); font-size:.7rem; }
.hecha-mark{ margin-left:auto; color:var(--ok); font-weight:700; font-size:.75rem; }

.ruta{ list-style:none; padding:0; margin:0; max-width:none; }
.ruta li{ display:flex; gap:1rem; padding-bottom:1.3rem; position:relative; margin:0; }
.ruta li::before{ content:""; position:absolute; left:15px; top:34px; bottom:0; width:2px; background:var(--border); }
.ruta li:last-child::before{ display:none; }
.ruta-n{ width:32px; height:32px; border-radius:50%; background:var(--surface); border:2px solid var(--brand); color:var(--brand); display:grid; place-items:center; font-family:var(--mono); font-weight:700; font-size:.76rem; flex:none; z-index:1; }
.ruta-c strong{ display:block; font-size:.97rem; margin-bottom:.15rem; }
.ruta-c span{ font-size:.87rem; color:var(--text-soft); }

/* ---------- 17. Pie ---------- */
footer.pie{ border-top:1px solid var(--border); background:var(--surface); margin-top:auto; }
.pie-in{ max-width:var(--maxw); margin:0 auto; padding:2rem 20px; display:flex; gap:1.5rem; justify-content:space-between; flex-wrap:wrap; font-size:.85rem; color:var(--muted); }
.pie-in a{ color:var(--text-soft); text-decoration:none; }
.pie-in a:hover{ color:var(--brand); text-decoration:underline; }
.pie-links{ display:flex; gap:1.1rem; flex-wrap:wrap; }

.crece{ flex:1 0 auto; width:100%; }

/* ---------- 18. Utilidades ---------- */
.sr{ position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }
.nota-origen{ font-size:.8rem; color:var(--muted); font-style:italic; margin-top:-.6rem; margin-bottom:1.2rem; }

@media print{
  .topbar,.sidebar,.lectura,.nav-unidad,.codigo-btn{ display:none !important; }
  .layout{ grid-template-columns:1fr; }
  body{ background:#fff; }
}