:root {
  --bg: #0E0E0C;
  --surface: #161512;
  --panel: #1C1A16;
  --ink: #E6E1D6;
  --soft: #9A9488;
  --amber: #C4A15A;
  --amber-ink: #1A160E;
  --danger: #C46A4A;
  --ok: #8F9A72;
  --line: rgba(230,225,214,.14);
  --max: 46rem;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1.05rem/1.6 "Segoe UI", system-ui, sans-serif;
}
a { color: var(--amber); }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.1rem 4rem; }
.barra {
  position: sticky; top: 0; z-index: 5;
  display: flex; justify-content: space-between; align-items: center; gap: .75rem;
  padding: .7rem 1.1rem;
  background: rgba(14,14,12,.94);
  border-bottom: 1px solid var(--line);
}
.progreso { min-width: 8rem; }
.progreso strong { font-weight: 600; }
.pista { height: 2px; background: var(--line); margin-top: .35rem; }
.lleno { height: 2px; background: var(--amber); }
.atajos { display: flex; gap: .5rem; flex-wrap: wrap; }
.atajo, button.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: .4rem .85rem;
  border: 1px solid var(--amber); border-radius: 2px;
  background: transparent; color: var(--amber);
  font: 600 .85rem/1 system-ui, sans-serif;
  text-decoration: none; cursor: pointer;
}
.atajo.is-disabled { opacity: .4; border-color: var(--soft); color: var(--soft); }
button.btn.solido { background: var(--amber); color: var(--amber-ink); }
.eyebrow {
  letter-spacing: .14em; text-transform: uppercase;
  font-size: .72rem; color: var(--amber); margin: 1.4rem 0 .3rem;
}
h1 {
  font: 600 2rem/1.2 Palatino, "Iowan Old Style", Georgia, serif;
  font-weight: 600; margin: 0 0 .4rem;
}
h1 em { font-style: italic; color: var(--amber); font-weight: 600; }
.meta { color: var(--soft); font-size: .92rem; margin: 0 0 1.2rem; }
h2 {
  font: 600 1.35rem/1.3 Palatino, Georgia, serif;
  margin: 2rem 0 .6rem; font-weight: 600;
}
h3 { font: 600 1.05rem/1.3 system-ui, sans-serif; margin: 1.3rem 0 .4rem; }
p { margin: .7rem 0; }
ul, ol { padding-left: 1.2rem; }
li { margin: .35rem 0; }
.panel {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 2px; padding: 1rem 1.1rem; margin: 1rem 0;
}
.texto {
  background: var(--surface); border-left: 2px solid var(--amber);
  padding: .2rem 1rem; margin: 1rem 0;
}
.texto footer, .fuente {
  color: var(--soft); font-size: .85rem;
}
.etiqueta {
  letter-spacing: .12em; text-transform: uppercase;
  font-size: .68rem; color: var(--amber);
}
.quiz, .editor {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 2px; padding: 1rem 1.1rem; margin: 1rem 0 1.4rem;
}
.quiz label { display: flex; gap: .6rem; align-items: flex-start; margin: .45rem 0; min-height: 44px; }
.quiz input { margin-top: .45rem; }
.porque { display: none; border-top: 1px solid var(--line); margin-top: .8rem; padding-top: .7rem; color: var(--ink); }
.quiz.visto .porque { display: block; }
.quiz.acierto { box-shadow: inset 3px 0 0 var(--ok); }
.quiz.fallo { box-shadow: inset 3px 0 0 var(--danger); }
textarea {
  width: 100%; min-height: 11rem; resize: vertical;
  background: var(--bg); color: var(--ink);
  border: 1px solid var(--line); border-radius: 2px;
  padding: .8rem; font: 400 1rem/1.55 system-ui, sans-serif;
}
.editor-bar { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; margin-top: .6rem; }
.aviso { color: var(--soft); font-size: .85rem; }
.pie { margin-top: 2.5rem; color: var(--soft); font-size: .85rem; border-top: 1px solid var(--line); padding-top: 1rem; }
.indice a { display: block; padding: .7rem 0; border-bottom: 1px solid var(--line); text-decoration: none; min-height: 44px; }
.indice a span { color: var(--soft); }
@media (max-width: 640px) {
  h1 { font-size: 1.6rem; }
  .barra { flex-direction: column; align-items: stretch; }
}

/* Vista alumno: oculta porqués y notas sin borrarlas. Modo maestro las muestra. */
body.vista-alumno details.porque,
body.vista-alumno p.porque,
body.vista-alumno .porque,
body.vista-alumno .nota-shell,
body.vista-alumno .nota-local,
body.vista-alumno .nota-maestro { display: none !important; }
body.vista-alumno details.correccion > :not(summary),
body.vista-alumno details.comprueba > :not(summary),
body.vista-alumno details.lv-clave > :not(summary) { display: none !important; }
a { color: var(--amber, var(--accion, var(--ink, #C4A15A))); text-decoration-color: var(--amber, var(--accion, #C4A15A)); }
.barra a, .atajo { text-decoration: none; }