/* ==========================================================================
   AEC·AI — web del curso. Tema industrial: grafito, acero y naranja de seguridad.
   ========================================================================== */

:root {
  --fondo:    #0d1013;
  --fondo-2:  #12161a;
  --panel:    #171c21;
  --panel-2:  #1d242a;
  --linea:    #2a333b;
  --linea-2:  #3a454f;
  --texto:    #e7eaed;
  --tenue:    #8d98a3;
  --acento:   #ff6a13;
  --acento-2: #ffb36b;
  --m1: #ff6a13;
  --m2: #38bdf8;
  --m3: #a3e635;
  --m4: #f43f5e;

  --f-titulo: "Barlow Condensed", "Arial Narrow", sans-serif;
  --f-texto:  "Barlow", system-ui, sans-serif;
  --f-mono:   "JetBrains Mono", ui-monospace, Consolas, monospace;

  --ancho: 1120px;
  --canal: clamp(16px, 4vw, 40px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--fondo);
  color: var(--texto);
  font: 400 17px/1.55 var(--f-texto);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; }
button { font: inherit; color: inherit; cursor: pointer; }
h1, h2, h3 { font-family: var(--f-titulo); text-transform: uppercase; letter-spacing: .01em; margin: 0; line-height: 1; }
:focus-visible { outline: 2px solid var(--acento); outline-offset: 2px; }

.cod {
  font: 500 12px/1 var(--f-mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--tenue);
}

/* ------------------------------------------------------------------ BARRA */
.barra {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  height: 56px; padding: 0 var(--canal);
  background: rgba(13, 16, 19, .86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--linea);
  transform: translateY(-100%);
  transition: transform .3s ease;
}
.barra.visible { transform: none; }
.barra__marca { display: flex; align-items: center; gap: 12px; text-decoration: none; min-width: 0; }
.marca__cod { font: 700 13px/1 var(--f-mono); color: var(--acento); letter-spacing: .1em; }
.marca__txt { font: 600 17px/1 var(--f-titulo); text-transform: uppercase; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.barra__nav { display: flex; align-items: center; gap: 14px; }
.barra__extras { font: 600 15px/1 var(--f-titulo); text-transform: uppercase; letter-spacing: .06em; text-decoration: none; color: var(--tenue); }
.barra__extras:hover { color: var(--acento); }

.conmutador, .idioma { display: inline-flex; border: 1px solid var(--linea-2); }
.conmutador button, .idioma button {
  white-space: nowrap;
  background: none; border: 0; padding: 7px 12px;
  font: 600 14px/1 var(--f-titulo); letter-spacing: .08em; text-transform: uppercase; color: var(--tenue);
}
.idioma button { font: 500 12px/1 var(--f-mono); padding: 7px 9px; }
.conmutador button.activo, .idioma button.activo { background: var(--acento); color: #111; }
.conmutador button:not(.activo):hover, .idioma button:not(.activo):hover { color: var(--texto); }

/* ------------------------------------------------------------------- HERO */
.hero {
  position: relative; min-height: 100svh;
  display: flex; flex-direction: column; justify-content: space-between;
  padding: 24px var(--canal) 0;
  isolation: isolate; overflow: hidden;
}
.hero__lienzo { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -2; }
.hero__velo {
  position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(ellipse 70% 60% at 22% 48%, rgba(13,16,19,.92) 0%, rgba(13,16,19,.55) 55%, transparent 100%),
    linear-gradient(to bottom, rgba(13,16,19,.5) 0%, transparent 25%, transparent 70%, var(--fondo) 100%);
}
.hero__sup { display: flex; justify-content: space-between; align-items: center; }
.hero__cuerpo { width: 100%; max-width: var(--ancho); margin: 0 auto; padding: 48px 0; }
.hero__ante {
  display: flex; align-items: center; gap: 10px; margin: 0 0 22px;
  font: 500 13px/1.3 var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--acento-2);
}
.punto { width: 8px; height: 8px; background: var(--acento); border-radius: 50%; box-shadow: 0 0 0 0 rgba(255,106,19,.6); animation: pulso 2s infinite; flex: none; }
@keyframes pulso { 70% { box-shadow: 0 0 0 10px rgba(255,106,19,0); } 100% { box-shadow: 0 0 0 0 rgba(255,106,19,0); } }

.hero__titulo {
  font-size: clamp(46px, 9.2vw, 124px);
  font-weight: 700; line-height: .9; letter-spacing: -.005em;
  max-width: 11ch;
}
.hero__titulo em { font-style: normal; color: var(--acento); }
.hero__intro { max-width: 56ch; margin: 28px 0 0; font-size: clamp(17px, 1.6vw, 20px); color: #c3cad1; }

.selector { display: flex; flex-wrap: wrap; align-items: stretch; gap: 12px; margin-top: 40px; }
.boton {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 40px; padding: 0 16px;
  border: 1px solid var(--linea-2); background: none; text-decoration: none;
  font: 600 15px/1 var(--f-titulo); text-transform: uppercase; letter-spacing: .08em;
  transition: background .15s, border-color .15s, color .15s;
}
.boton:hover { border-color: var(--acento); color: var(--acento); }
.boton--ir { height: 54px; padding: 0 26px; font-size: 20px; background: var(--acento); border-color: var(--acento); color: #111; }
.boton--ir:hover { background: #ff8a3d; color: #111; }
.boton--lleno { background: var(--acento); border-color: var(--acento); color: #111; }
.boton--lleno:hover { background: #ff8a3d; color: #111; }
.boton--off { color: var(--tenue); border-style: dashed; pointer-events: none; }

.hero__datos {
  width: 100%; max-width: var(--ancho); margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--linea-2);
}
.hero__datos div { padding: 18px 18px 22px 0; }
.hero__datos div + div { padding-left: 18px; border-left: 1px solid var(--linea); }
.hero__datos dt { font: 500 11px/1 var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--tenue); }
.hero__datos dd { margin: 8px 0 0; font: 600 clamp(20px, 2.4vw, 28px)/1 var(--f-titulo); text-transform: uppercase; }

/* --------------------------------------------------------------- SECCIONES */
.seccion { max-width: calc(var(--ancho) + 2 * var(--canal)); margin: 0 auto; padding: 96px var(--canal) 72px; }
.seccion__cab { margin-bottom: 48px; }
.seccion__cab h2 { font-size: clamp(38px, 6vw, 72px); font-weight: 700; margin-top: 14px; }
.seccion__cab p { max-width: 62ch; margin: 14px 0 0; color: var(--tenue); }

.ficha { background: var(--panel); border: 1px solid var(--linea); transition: border-color .2s; }
.ficha:hover { border-color: var(--linea-2); }
.ficha__cab {
  width: 100%; display: grid; grid-template-columns: 1fr auto; gap: 8px 16px; align-items: start;
  padding: 18px 22px; background: none; border: 0; text-align: left;
}
.ficha__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; grid-column: 1 / -1; }
.chapa { display: inline-block; padding: 4px 7px; font: 500 11px/1 var(--f-mono); letter-spacing: .1em; text-transform: uppercase; border: 1px solid var(--linea-2); color: var(--tenue); }
.chapa--mod { color: var(--mod); border-color: color-mix(in srgb, var(--mod) 50%, transparent); }
.chapa--hoy { background: var(--acento); border-color: var(--acento); color: #111; font-weight: 700; }
.chapa--ok { color: var(--tenue); }
.ficha__titulo { font: 600 clamp(24px, 3vw, 32px)/1.05 var(--f-titulo); text-transform: uppercase; }
.ficha__mas { align-self: center; width: 30px; height: 30px; display: grid; place-items: center; border: 1px solid var(--linea-2); color: var(--tenue); font: 400 20px/1 var(--f-mono); transition: transform .2s, color .2s; }
.ficha__cab:hover .ficha__mas { color: var(--acento); border-color: var(--acento); }
.ficha__cuerpo { display: none; padding: 0 22px 22px; }
.ficha__resumen { margin: 0 0 20px; max-width: 70ch; color: #c9d0d6; }

.rotulo { margin: 22px 0 10px; font: 500 11px/1 var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--tenue); display: flex; align-items: center; gap: 10px; }
.rotulo::after { content: ""; flex: 1; height: 1px; background: var(--linea); }
.temas { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.temas li { position: relative; padding-left: 18px; font-size: 16px; }
.temas li::before { content: ""; position: absolute; left: 0; top: .62em; width: 8px; height: 2px; background: var(--mod, var(--acento)); }

.ejs { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--linea); }
.ej { display: grid; grid-template-columns: 44px 1fr; gap: 12px; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--linea); }
.ej__n { font: 700 14px/1 var(--f-mono); color: var(--mod, var(--acento)); }
.ej__t { font-size: 16px; }
.ej__sesion { display: block; margin-top: 3px; font: 400 11px/1 var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--tenue); }
.ej a, .ej span.pend { font: 600 13px/1 var(--f-titulo); letter-spacing: .1em; text-transform: uppercase; text-decoration: none; white-space: nowrap; }
.ej a { color: var(--acento); } .ej a:hover { text-decoration: underline; }
.ej span.pend { color: #65717c; }
.acciones { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.acciones:empty, .ses__acc:empty { display: none; }

/* -------------------------------------------------------------- ITINERARIO */
.itin { display: grid; gap: 22px; }
.modulo { --mod: var(--acento); display: grid; grid-template-columns: 210px 1fr; background: var(--panel); border: 1px solid var(--linea); }
.modulo[data-mod="m1"] { --mod: var(--m1); } .modulo[data-mod="m2"] { --mod: var(--m2); }
.modulo[data-mod="m3"] { --mod: var(--m3); } .modulo[data-mod="m4"] { --mod: var(--m4); }
.modulo__lado {
  padding: 24px 22px; border-right: 1px solid var(--linea);
  background:
    repeating-linear-gradient(0deg, transparent 0 23px, rgba(255,255,255,.025) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 23px, rgba(255,255,255,.025) 23px 24px),
    var(--fondo-2);
}
.modulo__num { font: 700 84px/.85 var(--f-titulo); color: var(--mod); }
.modulo__fechas { margin-top: 18px; display: grid; gap: 6px; }
.modulo__fechas span { font: 500 12px/1.2 var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--tenue); }
.modulo__cuerpo { padding: 24px 26px 26px; min-width: 0; }
.modulo__titulo { font: 600 clamp(24px, 3vw, 34px)/1.05 var(--f-titulo); }
.recursos { display: flex; flex-wrap: wrap; gap: 8px; }
.recursos a { padding: 6px 10px; border: 1px solid var(--linea-2); font: 500 12px/1 var(--f-mono); text-decoration: none; color: var(--tenue); }
.recursos a:hover { color: var(--acento); border-color: var(--acento); }

/* -------------------------------------------------------------- REQUISITOS */
.seccion--req { padding-bottom: 0; }
.reqs { display: grid; grid-template-columns: repeat(var(--n, 3), minmax(0, 1fr)); border: 1px solid var(--linea); background: var(--panel); }
.req { display: flex; flex-direction: column; gap: 8px; padding: 18px 20px; min-width: 0; }
.req + .req { border-left: 1px solid var(--linea); }
.req__tipo { font: 500 10px/1 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--tenue); }
.req--si .req__tipo { color: var(--acento); }
.req__nom { font: 600 24px/1.05 var(--f-titulo); text-transform: uppercase; }
.req__para { font-size: 14.5px; line-height: 1.4; color: #aab4bd; flex: 1; }
.req__ir { font: 600 14px/1 var(--f-titulo); letter-spacing: .1em; text-transform: uppercase; color: var(--acento); text-decoration: none; }
.req__ir:hover { text-decoration: underline; }

/* Opcionales: plegados por defecto, para que no pesen lo mismo */
.opc { margin-top: 10px; }
.opc summary {
  display: flex; align-items: baseline; flex-wrap: wrap; gap: 6px 12px;
  padding: 10px 0; cursor: pointer; list-style: none; color: var(--tenue);
}
.opc summary::-webkit-details-marker { display: none; }
.opc__mas { width: 20px; height: 20px; display: inline-grid; place-items: center; align-self: center; border: 1px solid var(--linea-2); font: 400 15px/1 var(--f-mono); transition: transform .2s, color .2s, border-color .2s; }
.opc__tit { font: 600 15px/1 var(--f-titulo); letter-spacing: .1em; text-transform: uppercase; }
.opc__txt { font-size: 14px; color: #65717c; }
.opc summary:hover, .opc summary:hover .opc__mas { color: var(--texto); border-color: var(--acento); }
.opc[open] .opc__mas { transform: rotate(45deg); color: var(--acento); border-color: var(--acento); }
.reqs--opc { margin-top: 4px; background: var(--fondo-2); }
.reqs--opc .req { padding: 14px 14px; }
.reqs--opc .req__nom { font-size: 19px; }
.reqs--opc .req__para { font-size: 13.5px; }

/* -------------------------------------------------------- ARTEFACTOS EXTRA */
.seccion--extras { padding-top: 0; }
.extras { padding: 26px; }
.extras__titulo { margin-top: 12px; font-size: clamp(28px, 3.4vw, 40px); font-weight: 700; }
.extras__sub { margin: 10px 0 18px; max-width: 70ch; color: var(--tenue); }
.ej__t b { font-weight: 600; }
.ej__desc { display: block; margin-top: 3px; font-size: 14.5px; line-height: 1.4; color: #9aa5af; }

/* ----------------------------------------------------- EXERCICIS PRÀCTICS */
.hero__der { display: flex; align-items: center; gap: 14px; }
.nou {
  display: inline-flex; align-items: center; gap: 10px; padding: 5px 12px 5px 5px;
  border: 1px solid rgba(255,106,19,.55); background: rgba(13,16,19,.7); text-decoration: none;
  font: 600 16px/1 var(--f-titulo); letter-spacing: .08em; text-transform: uppercase;
  transition: border-color .15s, background .15s;
}
.nou[hidden] { display: none; }
.nou:hover { border-color: var(--acento); background: rgba(255,106,19,.12); }
.nou__tag { padding: 5px 7px; background: var(--acento); color: #111; font: 700 11px/1 var(--f-mono); letter-spacing: .12em; animation: nou 2.4s ease-in-out infinite; }
@keyframes nou { 50% { background: var(--acento-2); } }

.seccion--pract { padding-top: 24px; }
.prac-datos { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0 0 28px; border-top: 1px solid var(--linea-2); border-bottom: 1px solid var(--linea); }
.prac-datos div { padding: 16px 18px 18px 0; }
.prac-datos div + div { padding-left: 18px; border-left: 1px solid var(--linea); }
.prac-datos dt { font: 500 11px/1 var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--tenue); }
.prac-datos dd { margin: 8px 0 0; font: 600 22px/1.1 var(--f-titulo); text-transform: uppercase; }

.roadmap { margin-bottom: 56px; }
.roadmap__cab { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 10px; }
.rotulo-s, .roadmap__total { font: 500 12px/1 var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--acento-2); }
.roadmap__total { color: var(--tenue); }
.roadmap__barra { display: flex; gap: 4px; }
.roadmap__tramo { display: flex; flex-direction: column; gap: 6px; min-width: 0; padding: 14px 16px 16px; background: var(--panel); border-top: 4px solid var(--acento); }
.roadmap__tramo:nth-child(2) { border-top-color: var(--acento-2); }
.roadmap__tramo:nth-child(3) { border-top-color: var(--m2); }
.roadmap__min { font: 500 11px/1 var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--tenue); }
.roadmap__tramo b { font: 600 22px/1 var(--f-titulo); text-transform: uppercase; }
.roadmap__tramo > span:last-child { font-size: 14px; line-height: 1.4; color: #aab4bd; }
.roadmap__nota { margin: 12px 0 0; font-size: 15px; color: var(--tenue); }

.nivel + .nivel { margin-top: 56px; }
.nivel__cab { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 12px 24px; padding-bottom: 14px; margin-bottom: 20px; border-bottom: 1px solid var(--linea-2); }
.nivel__cab h3 { font-size: clamp(28px, 3.6vw, 40px); font-weight: 700; }
.nivel--avancat .nivel__cab h3 { color: var(--acento); }
.nivel__eines { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.nivel__eines .cod { margin-right: 4px; }
.ruta + .ruta { margin-top: 32px; }
.ruta__cab { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin-bottom: 14px; }
.ruta__n { font: 700 13px/1 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--acento); }
.ruta__cab h4 { margin: 0; font: 600 clamp(20px, 2.4vw, 26px)/1.05 var(--f-titulo); text-transform: uppercase; }
.casos { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 16px; }
.cas { display: flex; flex-direction: column; background: var(--panel); border: 1px solid var(--linea); padding: 20px 22px; transition: border-color .2s; }
.cas:hover { border-color: var(--linea-2); }
.cas__cab { display: flex; align-items: flex-start; gap: 14px; }
.cas__id { flex: none; min-width: 46px; font: 700 40px/.85 var(--f-titulo); color: var(--acento); }
.cas__cab h5 { margin: 2px 0 0; font: 600 22px/1.1 var(--f-titulo); text-transform: uppercase; }
.cas__esc { margin: 14px 0 0; font-size: 15.5px; color: #c9d0d6; }
.cas__etq { display: block; margin-bottom: 5px; font: 500 11px/1 var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--tenue); }
.cas__det { margin-top: auto; padding-top: 14px; }
.cas__det summary { display: flex; align-items: center; gap: 10px; padding: 8px 0 0; cursor: pointer; list-style: none; font: 600 14px/1 var(--f-titulo); letter-spacing: .1em; text-transform: uppercase; color: var(--tenue); border-top: 1px solid var(--linea); padding-top: 14px; }
.cas__det summary::-webkit-details-marker { display: none; }
.cas__det summary:hover, .cas__det summary:hover .opc__mas { color: var(--texto); border-color: var(--acento); }
.cas__det[open] .opc__mas { transform: rotate(45deg); color: var(--acento); border-color: var(--acento); }
.cas__cols { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 24px; }
.cas__cols .rotulo { margin-top: 18px; }
.cas__cols .temas li { font-size: 15px; }
.tareas { margin: 0; padding-left: 22px; display: grid; gap: 6px; font-size: 15px; }
.tareas li::marker { font: 700 13px var(--f-mono); color: var(--acento); }

@media (max-width: 1100px) {
  .cas__cols { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .hero__sup { flex-wrap: wrap; gap: 12px; }
  .nou { font-size: 14px; }
  .prac-datos { grid-template-columns: 1fr; }
  .prac-datos div + div { padding-left: 0; border-left: 0; border-top: 1px solid var(--linea); }
  .prac-datos div { padding: 12px 0; }
  .roadmap__barra { flex-direction: column; }
  .roadmap__tramo { flex: none !important; border-top: 0; border-left: 4px solid var(--acento); background: linear-gradient(90deg, rgba(255,106,19,.10) var(--p), var(--panel) var(--p)); }
  .roadmap__tramo:nth-child(2) { border-left-color: var(--acento-2); }
  .roadmap__tramo:nth-child(3) { border-left-color: var(--m2); }
  .casos { grid-template-columns: 1fr; }
  .cas { padding: 18px 16px; }
}
@media (max-width: 420px) {
  .nou__txt { font-size: 13px; letter-spacing: .04em; }
}

/* ------------------------------------------------- MATERIAL DE LAS SESIONES */
.ses { grid-template-columns: 44px 1fr auto; }
.ses__acc { display: flex; gap: 14px; }
.ses__acc a, .ses__acc .pend { font: 600 13px/1 var(--f-titulo); letter-spacing: .1em; text-transform: uppercase; text-decoration: none; white-space: nowrap; }
.ses__acc a { color: var(--acento); } .ses__acc a:hover { text-decoration: underline; }
.ses__acc .pend { color: #4b5560; }
.ses__hoy { color: var(--acento); font-weight: 700; }
.ses--hoy .ej__n { color: var(--acento); }

/* ------------------------------------------------- PRÀCTIQUES: SETMANES */
.semana { background: var(--panel); border: 1px solid var(--linea); }
.semana + .semana { margin-top: 16px; }
.semana[open] { border-color: var(--linea-2); }
.semana__cab {
  display: grid; grid-template-columns: auto 1fr auto auto; align-items: center; gap: 8px 18px;
  padding: 20px 22px; cursor: pointer; list-style: none;
}
.semana__cab::-webkit-details-marker { display: none; }
.semana__n { font: 700 13px/1 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--acento); white-space: nowrap; }
.semana__tit { font: 600 clamp(22px, 2.8vw, 30px)/1.05 var(--f-titulo); text-transform: uppercase; }
.semana__tit em { font-style: normal; color: var(--tenue); }
.semana__fechas { font: 500 12px/1 var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--tenue); white-space: nowrap; }
.semana__cab:hover .ficha__mas { color: var(--acento); border-color: var(--acento); }
.semana[open] > .semana__cab .ficha__mas { transform: rotate(45deg); color: var(--acento); border-color: var(--acento); }
.semana__cuerpo { padding: 8px 22px 26px; border-top: 1px solid var(--linea); }
.semana__cuerpo > .prac-datos:first-child { margin-top: 18px; }
.semana__cuerpo .cas { background: var(--fondo-2); }

/* Enunciat d'un sol cas (cas tipus DC-100) */
.exp__lema { margin: 22px 0 18px; font: 700 clamp(34px, 5vw, 58px)/.95 var(--f-titulo); text-transform: uppercase; }
.prac-datos--cifras { grid-template-columns: repeat(4, 1fr); }
.prac-datos .dest dd { color: var(--acento); }
.exp__relato { max-width: 72ch; }
.exp__relato p { margin: 0 0 12px; font-size: 17px; color: #c9d0d6; }

@media (max-width: 1100px) {
  .prac-datos--cifras { grid-template-columns: repeat(2, 1fr); }
  .prac-datos--cifras div:nth-child(3) { padding-left: 0; border-left: 0; }
  .prac-datos--cifras div:nth-child(n+3) { border-top: 1px solid var(--linea); }
}
@media (max-width: 760px) {
  .barra__nav .barra__extras--fijo { display: inline; }
  .ses { grid-template-columns: 36px 1fr; }
  .ses__acc { grid-column: 2; }
  .semana__cab { grid-template-columns: 1fr auto; padding: 16px; }
  .semana__n, .semana__fechas { grid-column: 1; }
  .semana__tit { grid-column: 1; }
  .semana__cab .ficha__mas { grid-column: 2; grid-row: 1 / 4; }
  .semana__cuerpo { padding: 4px 16px 20px; }
  .prac-datos--cifras { grid-template-columns: 1fr 1fr; }
  .prac-datos--cifras div { padding: 12px 12px 12px 0; }
}

/* ----------------------------------------- PRESENTACIÓ + EXEMPLES (doble) */
.seccion--doble { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.seccion--doble .extras { display: flex; flex-direction: column; }
.seccion--doble .extras__sub { flex: 1; }

/* -------------------------------------------------------- CLASSES GRAVADES */
.hero__link {
  display: inline-flex; align-items: center; gap: 9px; padding: 9px 12px;
  border: 1px solid var(--linea-2); background: rgba(13,16,19,.7); text-decoration: none;
  font: 600 16px/1 var(--f-titulo); letter-spacing: .08em; text-transform: uppercase; color: var(--texto);
  transition: border-color .15s, color .15s;
}
.hero__link:hover { border-color: var(--acento); color: var(--acento); }
.hero__play { width: 0; height: 0; border-left: 9px solid var(--acento); border-top: 6px solid transparent; border-bottom: 6px solid transparent; }
.hero__link[hidden], .barra__extras[hidden] { display: none; }

.seccion--grab { padding-top: 24px; }
.videos { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.video { display: flex; flex-direction: column; background: var(--panel); border: 1px solid var(--linea); }
.video__prev, .video__frame { position: relative; display: block; width: 100%; aspect-ratio: 16 / 9; border: 0; padding: 0; background: #000; }
.video__prev { cursor: pointer; overflow: hidden; }
.video__prev img { display: block; width: 100%; height: 100%; object-fit: cover; filter: grayscale(.4) brightness(.75); transition: filter .25s, transform .4s; }
.video__prev:hover img, .video__prev:focus-visible img { filter: none; transform: scale(1.03); }
.video__ses { position: absolute; left: 12px; top: 12px; padding: 5px 7px; background: rgba(13,16,19,.85); font: 700 12px/1 var(--f-mono); letter-spacing: .1em; color: var(--acento); }
.video__play { position: absolute; left: 50%; top: 50%; width: 62px; height: 62px; margin: -31px 0 0 -31px; background: var(--acento); transition: transform .2s; }
.video__play::before { content: ""; position: absolute; left: 24px; top: 19px; border-left: 19px solid #111; border-top: 12px solid transparent; border-bottom: 12px solid transparent; }
.video__prev:hover .video__play { transform: scale(1.08); }
.video__info { display: flex; flex-direction: column; gap: 8px; flex: 1; padding: 16px 18px 18px; }
.video__info h3 { font-size: 22px; font-weight: 600; line-height: 1.05; }
.video__info a { margin-top: auto; padding-top: 6px; font: 600 13px/1 var(--f-titulo); letter-spacing: .1em; text-transform: uppercase; color: var(--acento); text-decoration: none; }
.video__info a:hover { text-decoration: underline; }

@media (max-width: 1100px) {
  .videos { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .seccion--doble, .videos { grid-template-columns: 1fr; }
  .hero__der { flex-wrap: wrap; justify-content: flex-end; }
  .hero__link { font-size: 14px; padding: 8px 10px; }
}

.exp .rotulo { margin-top: 30px; }
.dc-dos { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 32px; }
.exp__relato .temas { margin: 0 0 12px; }
.dc-cierre { font-weight: 600; color: var(--texto) !important; }
.dc-ficha { display: grid; grid-template-columns: minmax(120px, 34%) 1fr; margin: 0; border-top: 1px solid var(--linea); }
.dc-ficha dt, .dc-ficha dd { margin: 0; padding: 9px 0; border-bottom: 1px solid var(--linea); }
.dc-ficha dt { padding-right: 14px; font: 500 11px/1.5 var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--tenue); }
.dc-ficha dd { font-size: 15px; line-height: 1.45; }
.dc-abast { margin: 0 0 10px; font-size: 15.5px; color: #c9d0d6; }
.dc-abast b { display: inline-block; min-width: 64px; margin-right: 8px; font: 600 14px/1 var(--f-titulo); letter-spacing: .1em; text-transform: uppercase; color: var(--m3); }
.dc-abast--no b { color: var(--m4); }
.dc-fichero { margin: 0 0 10px; font-size: 15px; color: var(--tenue); }
.dc-fichero code { font: 500 13px/1.4 var(--f-mono); color: var(--acento-2); background: var(--fondo-2); padding: 2px 6px; }
.pasos { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.paso { position: relative; padding: 18px 18px 20px; background: var(--fondo-2); border: 1px solid var(--linea); }
.paso__n { display: block; font: 700 34px/.85 var(--f-titulo); color: var(--acento); }
.paso h5 { margin: 10px 0 8px; font: 600 21px/1.05 var(--f-titulo); text-transform: uppercase; }
.paso__desc { margin: 0; font-size: 15px; line-height: 1.45; color: #c9d0d6; }
.paso .temas li { font-size: 14.5px; }
.paso__nota { margin: 12px 0 0; font: 500 12px/1.45 var(--f-mono); letter-spacing: .04em; color: var(--acento-2); }
.dc-ruta { padding: 12px 0; border-bottom: 1px solid var(--linea); }
.dc-ruta:first-of-type { border-top: 1px solid var(--linea); }
.dc-ruta b { font: 600 18px/1 var(--f-titulo); letter-spacing: .06em; text-transform: uppercase; color: var(--acento); }
.dc-ruta p { margin: 6px 0 0; font-size: 15px; color: #c9d0d6; }
.roadmap--plan { margin: 30px 0 4px; }
.roadmap--plan .roadmap__tramo { flex-basis: 0; min-width: 126px; padding: 12px 12px 14px; }
.roadmap--plan .roadmap__tramo:nth-child(4) { border-top-color: var(--m3); }
.roadmap--plan .roadmap__tramo:nth-child(5) { border-top-color: var(--m4); }
.roadmap--plan .roadmap__tramo:nth-child(6) { border-top-color: var(--texto); }
.roadmap--plan .roadmap__tramo b { font-size: 16px; line-height: 1.1; overflow-wrap: break-word; }

@media (max-width: 1100px) {
  .pasos { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dc-dos { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .pasos { grid-template-columns: 1fr; }
  .dc-ficha { grid-template-columns: 1fr; }
  .dc-ficha dt { padding-bottom: 0; border-bottom: 0; }
  .roadmap--plan .roadmap__tramo { min-width: 0; }
  .roadmap--plan .roadmap__tramo:nth-child(4) { border-left-color: var(--m3); }
  .roadmap--plan .roadmap__tramo:nth-child(5) { border-left-color: var(--m4); }
  .roadmap--plan .roadmap__tramo:nth-child(6) { border-left-color: var(--texto); }
}

/* -------------------------------------------- CONTACTO Y ENTREGA DE EJERCICIOS */
.hero__mail { display: inline-flex; align-items: center; gap: 9px; font: 500 13px/1 var(--f-mono); letter-spacing: .06em; color: var(--tenue); text-decoration: none; }
.hero__mail:hover { color: var(--acento); }
.hero__mail[hidden] { display: none; }
.hero__sobre { position: relative; width: 16px; height: 11px; border: 1.5px solid currentColor; }
.hero__sobre::before { content: ""; position: absolute; left: 2px; top: -3px; width: 9px; height: 9px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg); }
button.hero__link { cursor: pointer; }
.hero__link--subir { background: var(--acento); border-color: var(--acento); color: #111; }
.hero__link--subir:hover { background: #ff8a3d; border-color: #ff8a3d; color: #111; }
.hero__flecha { font: 700 15px/1 var(--f-mono); }
.subir-btn[hidden] { display: none; }
.barra__subir {
  padding: 7px 11px; border: 1px solid var(--acento); background: var(--acento); color: #111;
  font: 600 14px/1 var(--f-titulo); letter-spacing: .08em; text-transform: uppercase; white-space: nowrap;
}
.barra__subir:hover { background: #ff8a3d; }

.modal {
  width: min(580px, calc(100% - 32px)); max-height: calc(100% - 32px); overflow: auto;
  padding: 28px 30px 30px; border: 1px solid var(--acento); background: var(--panel); color: var(--texto);
}
.modal::backdrop { background: rgba(5, 7, 9, .78); backdrop-filter: blur(3px); }
.modal h2 { margin-top: 12px; font-size: clamp(28px, 4vw, 38px); font-weight: 700; }
.modal__x { position: absolute; top: 14px; right: 14px; margin: 0; }
.modal__x button { padding: 6px 10px; border: 1px solid var(--linea-2); background: none; font: 600 13px/1 var(--f-titulo); letter-spacing: .1em; text-transform: uppercase; color: var(--tenue); }
.modal__x button:hover { color: var(--acento); border-color: var(--acento); }
.modal__pasos { margin: 22px 0 0; padding-left: 24px; display: grid; gap: 14px; font-size: 16px; }
.modal__pasos li::marker { font: 700 14px var(--f-mono); color: var(--acento); }
.modal__formato { display: block; margin: 10px 0 8px; padding: 10px 12px; background: var(--fondo-2); border: 1px solid var(--linea-2); font: 600 14px/1.4 var(--f-mono); color: var(--acento-2); overflow-wrap: anywhere; }
.modal__ej { font-size: 14px; color: var(--tenue); }
.modal__ej code { font: 500 13px var(--f-mono); color: var(--texto); }
.modal .acciones { margin-top: 26px; }

@media (max-width: 760px) {
  .hero__mail { width: 100%; font-size: 12px; }
  .barra__nav .barra__extras--fijo { display: none; }
  .barra__subir { font-size: 13px; padding: 7px 9px; }
  .modal { padding: 22px 18px 22px; }
}

/* --------------------------------------------------------------------- PIE */
.pie {
  max-width: calc(var(--ancho) + 2 * var(--canal)); margin: 0 auto; padding: 48px var(--canal) 32px;
  display: grid; grid-template-columns: 2fr 1fr; gap: 32px;
  border-top: 1px solid var(--linea); color: var(--tenue); font-size: 15px;
}
.pie h3 { font-size: 18px; color: var(--texto); margin-bottom: 10px; letter-spacing: .06em; }
.pie p { margin: 0; }
.pie a { color: var(--texto); }
.pie a:hover { color: var(--acento); }
.pie__col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.pie__firma { grid-column: 1 / -1; padding-top: 22px; border-top: 1px solid var(--linea); font: 400 12px/1 var(--f-mono); letter-spacing: .08em; }

/* Aparición al hacer scroll */
.aparece { opacity: 0; transform: translateY(18px); transition: opacity .5s ease, transform .5s ease; }
.aparece.dentro { opacity: 1; transform: none; }

/* -------------------------------------------------------------- ADAPTATIVO */
@media (max-width: 1100px) {
  .reqs--opc { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .reqs--opc .req { border-top: 1px solid var(--linea); }
  .reqs--opc .req + .req { border-left: 0; }
  .reqs--opc .req:nth-child(3n+2), .reqs--opc .req:nth-child(3n+3) { border-left: 1px solid var(--linea); }
  .reqs--opc .req:nth-child(-n+3) { border-top: 0; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .marca__txt, .barra__extras { display: none; }
  .barra { gap: 8px; } .barra__nav { gap: 8px; }
  .conmutador button { padding: 7px 8px; font-size: 13px; letter-spacing: .04em; }
  .hero__datos { grid-template-columns: repeat(2, 1fr); }
  .hero__datos div:nth-child(3) { padding-left: 0; border-left: 0; }
  .hero__datos div:nth-child(n+3) { border-top: 1px solid var(--linea); }
  .boton--ir { width: 100%; }
  .ej { grid-template-columns: 36px 1fr; }
  .reqs, .reqs--opc { grid-template-columns: 1fr; }
  .req { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; padding: 14px 16px; }
  .req + .req, .reqs--opc .req + .req { border-left: 0; border-top: 1px solid var(--linea); }
  .reqs--opc .req:nth-child(3n+2), .reqs--opc .req:nth-child(3n+3) { border-left: 0; }
  .req__tipo { grid-column: 1 / -1; } .req__para { grid-column: 1; } .req__ir { grid-column: 2; grid-row: 2 / 4; align-self: center; }
  .extras { padding: 18px 16px; }
  .modulo { grid-template-columns: 1fr; }
  .modulo__lado { border-right: 0; border-bottom: 1px solid var(--linea); display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; }
  .modulo__num { font-size: 60px; } .modulo__fechas { margin-top: 0; text-align: right; }
  .modulo__cuerpo { padding: 20px 16px; }
  .pie { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .aparece { opacity: 1; transform: none; transition: none; }
  .punto { animation: none; }
}