/* =============================================================
   App shell — cero marketing, cero animación de sobra
   ============================================================= */
.app-body { background: var(--bg); }
.app-noscript { padding: 1rem; text-align: center; background: var(--err); color: #fff; }

.app-header { border-bottom: 1px solid var(--border); }
.app-header__inner { display: flex; align-items: center; justify-content: space-between; padding-block: 1rem; }
.app-header__nav { display: flex; align-items: center; gap: 1.25rem; white-space: nowrap; }
.app-header__saludo { color: var(--muted); }

.app-main { padding-block: clamp(2rem, 5vw, 3.5rem); max-width: 780px; }
.app-lead { color: var(--muted); margin-block: .75rem 1.5rem; }
.vista h1 { font-size: clamp(1.6rem, 3vw, 2.1rem); margin-bottom: .25rem; }

/* =============================================================
   Selector de materias
   ============================================================= */
.materias-grid { display: grid; gap: .9rem; grid-template-columns: 1fr; margin-bottom: 2rem; }
@media (min-width: 540px) { .materias-grid { grid-template-columns: repeat(2, 1fr); } }

.materia-card {
  --materia-color: #3f8efc;
  display: flex; align-items: center; gap: .75rem;
  padding: 1rem 1.1rem; border-radius: var(--radius);
  border: 2px solid var(--border); cursor: pointer;
  transition: border-color .2s var(--ease-out), background .2s var(--ease-out);
}
.materia-card:has(input:checked) { border-color: var(--materia-color); background: color-mix(in srgb, var(--materia-color) 12%, transparent); }
.materia-card input { accent-color: var(--materia-color); width: 1.15rem; height: 1.15rem; }
.materia-card__nombre { font-weight: 600; }

.examenes-disponibles { margin-top: 2.5rem; padding-top: 2rem; border-top: 1px solid var(--border); }
.examenes-lista { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1rem; }

/* =============================================================
   Barra superior de práctica/examen
   ============================================================= */
.practica-topbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .5rem .75rem; margin-bottom: 1.25rem; }
.materia-badge {
  --materia-color: #3f8efc;
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .35rem .8rem; border-radius: 999px; font-weight: 600; font-size: .85rem;
  background: color-mix(in srgb, var(--materia-color) 22%, transparent);
  color: var(--cream);
  border: 1px solid var(--materia-color);
}
.practica-progreso { color: var(--muted); font-size: .9rem; white-space: nowrap; }

/* =============================================================
   Audio de la unidad — nunca bloquea el acceso a las preguntas
   ============================================================= */
.audio-unidad { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.25rem; margin-bottom: 1.5rem; }
.audio-unidad__titulo { font-weight: 600; margin-bottom: .6rem; }
.audio-unidad audio { width: 100%; }

/* =============================================================
   Tarjeta de pregunta
   ============================================================= */
.pregunta-card { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: clamp(1.25rem, 3vw, 2rem); }
.pregunta-enunciado { font-size: 1.15rem; font-weight: 500; margin-bottom: 1.25rem; }

.pregunta-opciones { display: grid; gap: .7rem; margin-bottom: 1rem; }
.opcion {
  display: flex; align-items: flex-start; gap: .75rem; text-align: left;
  padding: .85rem 1rem; border-radius: 10px; border: 1px solid var(--border);
  transition: border-color .15s var(--ease-out), background .15s var(--ease-out);
}
.opcion:hover:not(:disabled) { border-color: var(--accent); }
.opcion:disabled { cursor: default; }
.opcion__letra { font-weight: 700; color: var(--muted); flex-shrink: 0; }
.opcion--elegida { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.opcion--correcta { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 16%, transparent); }
.opcion--incorrecta { border-color: var(--err); background: color-mix(in srgb, var(--err) 16%, transparent); }

.pregunta-feedback { margin-block: 1rem; padding: 1rem; border-radius: 10px; background: rgba(255,255,255,0.04); font-size: .95rem; }
.pregunta-feedback p + p { margin-top: .5rem; }
.feedback-correcta { color: var(--ok); }
.feedback-incorrecta { color: var(--err); }
.feedback-error { color: var(--err); }

/* =============================================================
   Resultado del examen final
   ============================================================= */
.resultado-calificacion { font-size: 1.4rem; font-weight: 700; margin-block: 1rem 2rem; }
.resultado-detalle { display: grid; gap: 1rem; margin-bottom: 2rem; }
.resultado-item { padding: 1rem 1.25rem; border-radius: var(--radius); border: 1px solid var(--border); font-size: .95rem; }
.resultado-item--ok { border-color: var(--ok); }
.resultado-item--mal { border-color: var(--err); }

/* =============================================================
   Navegación: materia → unidad → actividad
   ============================================================= */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.app-error { color: var(--err); background: color-mix(in srgb, var(--err) 10%, transparent); border: 1px solid var(--err); border-radius: 10px; padding: 1rem; }
.app-error a { color: var(--cream); font-weight: 600; text-decoration: underline; }

.volver { display: block; width: fit-content; color: var(--muted); font-weight: 500; font-size: .95rem; margin-bottom: 1.25rem; }
.volver:hover { color: var(--cream); }
.vista h2 { font-size: clamp(1.25rem, 2.4vw, 1.5rem); margin-bottom: .25rem; }

.barra { display: block; height: 6px; border-radius: 999px; background: rgba(255,255,255,0.08); overflow: hidden; }
.barra > span { display: block; height: 100%; border-radius: inherit; background: var(--materia-color, var(--accent)); }

/* Inicio: tarjetas de materia */
.materia-tile {
  --materia-color: #3f8efc;
  display: grid; gap: .45rem; padding: 1.2rem 1.25rem 1.1rem; border-radius: var(--radius);
  background: var(--bg-soft); border: 1px solid var(--border);
  border-left: 4px solid var(--materia-color);
  transition: border-color .2s var(--ease-out), background .2s var(--ease-out);
}
.materia-tile:hover { background: color-mix(in srgb, var(--materia-color) 8%, var(--bg-soft)); }
.materia-tile__nombre { font-family: var(--serif); font-size: 1.2rem; font-weight: 600; line-height: 1.2; }
.materia-tile__meta, .materia-tile__avance { color: var(--muted); font-size: .9rem; }
.materia-tile .barra { margin-top: .35rem; }

.bloque-mixto { margin-top: 1rem; padding-top: 2rem; border-top: 1px solid var(--border); }
.bloque-mixto .materias-grid { margin-bottom: 1.25rem; }

/* Materia: lista de unidades */
.unidades-lista { display: grid; gap: .75rem; margin-block: 1.5rem 2.5rem; }
.unidad-item {
  --materia-color: #3f8efc;
  display: grid; grid-template-columns: auto 1fr auto; gap: 1rem; align-items: center;
  padding: 1rem 1.1rem; border-radius: var(--radius); background: var(--bg-soft); border: 1px solid var(--border);
  transition: border-color .2s var(--ease-out);
}
.unidad-item:hover { border-color: var(--materia-color); }
.unidad-item__num {
  width: 2.2rem; height: 2.2rem; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; border: 2px solid var(--materia-color); color: var(--cream);
}
.unidad-item--completa .unidad-item__num { background: var(--materia-color); color: #fff; }
.unidad-item__cuerpo { display: grid; gap: .35rem; min-width: 0; }
.unidad-item__titulo { font-weight: 600; line-height: 1.3; }
.unidad-item__meta { color: var(--muted); font-size: .85rem; }
.unidad-item__estado { color: var(--muted); font-size: .85rem; font-variant-numeric: tabular-nums; white-space: nowrap; }
.unidad-item--completa .unidad-item__estado { color: var(--ok); font-weight: 600; }
.materia-examen { padding-top: 1.75rem; border-top: 1px solid var(--border); }
.materia-examen .app-lead { margin-top: .4rem; }

/* Unidad */
.unidad-numero { color: var(--muted); font-weight: 600; font-size: .85rem; letter-spacing: .05em; text-transform: uppercase; margin-bottom: .4rem; }
#vista-unidad h1 { margin-bottom: 1.25rem; }
.aprendizaje { margin-bottom: 1.25rem; border: 1px solid var(--border); border-radius: 10px; padding: .75rem 1rem; }
.aprendizaje summary { cursor: pointer; font-weight: 600; }
.aprendizaje ul { margin-top: .75rem; display: grid; gap: .5rem; padding-left: 1.1rem; list-style: disc; color: var(--muted); font-size: .95rem; }
.audio-unidad__nota { color: var(--muted); font-size: .95rem; }
.guion { margin-top: .75rem; }
.guion summary { cursor: pointer; color: var(--accent); font-weight: 600; font-size: .95rem; }
.guion__texto { margin-top: .75rem; max-height: 60vh; overflow-y: auto; padding-right: .5rem; font-size: .98rem; line-height: 1.7; }
.guion__texto p + p { margin-top: .85rem; }

.actividades { display: grid; gap: .8rem; grid-template-columns: 1fr; }
@media (min-width: 620px) { .actividades { grid-template-columns: repeat(3, 1fr); } }
.actividad {
  display: grid; gap: .3rem; align-content: start; padding: 1.1rem; border-radius: var(--radius);
  background: var(--bg-soft); border: 1px solid var(--border);
  transition: border-color .2s var(--ease-out), transform .2s var(--ease-out);
}
a.actividad:hover { border-color: var(--accent); transform: translateY(-1px); }
.actividad__icono svg { width: 26px; height: 26px; fill: none; stroke: var(--accent); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; margin-bottom: .35rem; }
.actividad__nombre { font-weight: 600; }
.actividad__meta { color: var(--muted); font-size: .88rem; }
.actividad__cta { color: var(--accent); font-weight: 600; font-size: .92rem; margin-top: .35rem; }
.actividad--off { opacity: .55; }
.actividad--off .actividad__icono svg { stroke: var(--muted); }
.proximamente { color: var(--muted); font-size: .9rem; margin-top: 1.25rem; }

/* Preguntas */
.pregunta-unidad { color: var(--muted); font-size: .85rem; margin-bottom: .6rem; }
.feedback-veredicto { font-weight: 700; font-size: 1.05rem; }
.feedback-tiempo { color: #e8b04a; }

/* Fin de sesión */
.fin-marcador, .juego-marcador { font-family: var(--serif); font-size: clamp(1.4rem, 3vw, 1.8rem); font-weight: 600; margin-block: .75rem .25rem; }
.fin-acciones { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.25rem; }

/* =============================================================
   Flashcards
   ============================================================= */
.fc-card { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: clamp(1.25rem, 3vw, 2rem); display: grid; gap: 1rem; }
.fc-tema { color: var(--muted); font-size: .85rem; }
.fc-frente { font-family: var(--serif); font-size: clamp(1.25rem, 3vw, 1.55rem); font-weight: 600; line-height: 1.3; }
.fc-reverso { white-space: pre-line; padding: 1rem 1.1rem; border-radius: 10px; background: rgba(255,255,255,0.04); border-left: 3px solid var(--accent); line-height: 1.65; }
.fc-voltear { justify-self: start; }
.fc-acciones { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem; }
.fc-pregunta { width: 100%; color: var(--muted); font-size: .9rem; }
.fc-aviso { color: var(--err); font-size: .9rem; }

/* =============================================================
   Juegos
   ============================================================= */
.juegos-lista { display: grid; gap: .8rem; margin-top: 1.25rem; }
.juego-item { display: grid; gap: .35rem; padding: 1.1rem 1.2rem; border-radius: var(--radius); background: var(--bg-soft); border: 1px solid var(--border); transition: border-color .2s var(--ease-out); }
.juego-item:hover { border-color: var(--accent); }
.juego-item__tipo { color: var(--accent); font-weight: 700; font-size: .8rem; letter-spacing: .05em; text-transform: uppercase; }
.juego-item__consigna { font-weight: 600; }
.juego-item__meta { color: var(--muted); font-size: .88rem; }

.juego-card { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: clamp(1.25rem, 3vw, 2rem); }
.juego-consigna { font-family: var(--serif); font-size: clamp(1.15rem, 2.6vw, 1.35rem); font-weight: 600; line-height: 1.3; margin-bottom: .5rem; }
.juego-instruccion { color: var(--muted); font-size: .92rem; margin-bottom: 1.25rem; }
.juego-resultado { margin-top: 1.25rem; }
.juego-retro { margin-top: 1rem; padding: 1rem 1.1rem; border-radius: 10px; background: rgba(255,255,255,0.04); font-size: .95rem; }
.juego-retro p { white-space: pre-line; margin-top: .35rem; color: var(--cream); }

/* Ordena los pasos */
.orden-secuencia { display: grid; gap: .5rem; margin-bottom: 1rem; }
.orden-hueco { display: flex; align-items: center; gap: .75rem; padding: .7rem .9rem; border: 1px dashed var(--border); border-radius: 10px; color: var(--muted); font-size: .9rem; }
.orden-pool { display: grid; gap: .5rem; margin-bottom: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.orden-paso { display: flex; align-items: flex-start; gap: .75rem; width: 100%; text-align: left; padding: .75rem .9rem; border-radius: 10px; border: 1px solid var(--border); background: rgba(255,255,255,0.02); line-height: 1.45; transition: border-color .15s var(--ease-out); }
.orden-paso:hover:not(:disabled) { border-color: var(--accent); }
.orden-paso--colocado { border-color: color-mix(in srgb, var(--accent) 55%, transparent); }
.orden-paso:disabled { cursor: default; }
.orden-num { flex-shrink: 0; width: 1.6rem; height: 1.6rem; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; background: rgba(255,255,255,0.08); font-weight: 700; font-size: .85rem; }
.orden--ok .orden-paso { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 14%, transparent); }
.orden--mal .orden-paso { border-color: var(--err); background: color-mix(in srgb, var(--err) 14%, transparent); }

/* Empareja */
.emparejar { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.emparejar__col { display: grid; gap: .5rem; align-content: start; }
.par { position: relative; text-align: left; padding: .7rem .8rem; border-radius: 10px; border: 1px solid var(--border); background: rgba(255,255,255,0.02); font-size: .92rem; line-height: 1.35; transition: border-color .15s var(--ease-out), background .15s var(--ease-out); }
.par:hover:not(:disabled) { border-color: var(--accent); }
.par--sel { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 16%, transparent); }
.par--ok { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, transparent); cursor: default; }
.par--mal { border-color: var(--err); background: color-mix(in srgb, var(--err) 16%, transparent); }
.par-num { display: inline-flex; align-items: center; justify-content: center; width: 1.3rem; height: 1.3rem; border-radius: 50%; background: var(--ok); color: #fff; font-size: .75rem; font-weight: 700; margin-right: .45rem; vertical-align: 1px; }
@media (max-width: 420px) { .par { font-size: .85rem; padding: .6rem .65rem; } }

/* Contrarreloj */
.reloj { height: 8px; border-radius: 999px; background: rgba(255,255,255,0.08); overflow: hidden; }
.reloj__barra { height: 100%; background: var(--accent); transform-origin: left center; transition: transform .2s linear, background .3s; }
.reloj__barra--poco { background: var(--err); }
.reloj__texto { color: var(--muted); font-size: .85rem; font-variant-numeric: tabular-nums; margin-block: .4rem 1rem; text-align: right; }

.resultado-item__enunciado { color: var(--muted); margin-block: .3rem .5rem; }

@media (max-width: 480px) {
  .app-header__saludo { display: none; }
  .materia-badge { font-size: .8rem; }
}