/* Guía pública — Ecuaciones de primer grado. Overrides locales.
 *
 * El sistema de diseño base vive en assets/design-system-v1.css (vendoreado).
 * Aquí solo va lo propio de esta guía: la barra de progreso por módulo, el
 * BLOQUE DE VIDEO (capa de soporte de YouTube) y los componentes de embudo
 * público (CTA y pantalla de cierre).
 *
 * Regla crítica heredada: cualquier estilo de píldora/badge sobre `span` en
 * clases que pueden contener KaTeX usa hijo directo `>`, nunca descendiente.
 */

/* === Navegación: subtítulo del medidor + dots por módulo + transición === */

.step-meter-sub {
  display: block;
  margin-top: 2px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.01em;
}

.mission-dots {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-top: 7px;
}

.mission-dot {
  display: inline-block;
  flex: 1 1 auto;
  height: 4px;
  border-radius: var(--r-full);
  background: var(--progress-track);
  transition: background 0.25s ease, transform 0.25s ease;
}

.mission-dot.is-done { background: var(--accent-blue); opacity: 0.55; }
.mission-dot.is-active { background: var(--accent-blue); transform: scaleY(1.6); }

.mission-transition {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 18px;
  margin-bottom: 12px;
  border: 1px solid rgba(217, 119, 6, 0.35);
  border-radius: var(--r-md);
  background: var(--bg-tint-yellow);
  color: var(--text-on-yellow);
  font-weight: 700;
  transition: opacity 0.45s ease, transform 0.45s ease, max-height 0.5s ease;
  max-height: 200px;
  overflow: hidden;
}

.mission-transition > strong { font-size: 1rem; font-weight: 800; }
.mission-transition > span { font-size: 0.9rem; font-weight: 600; }

.mission-transition.is-leaving {
  opacity: 0;
  transform: translateY(-6px);
  max-height: 0;
  margin-bottom: 0;
  padding-top: 0;
  padding-bottom: 0;
  border-color: transparent;
}

@media (prefers-reduced-motion: reduce) {
  .mission-dot, .mission-transition { transition: none; }
}

/* =================================================================
   BLOQUE DE VIDEO — la capa de soporte. El video NO es la columna de
   la guía: aparece como un "¿necesitas que te lo expliquen?" dentro
   del módulo, con una pregunta previa que activa al alumno y un enlace
   de respaldo a YouTube (resiliencia ante embeds deshabilitados / link rot).
   ================================================================= */

.learning-block.video {
  border-left-color: #8957e5;
  background: var(--bg-elev-2);
}

.learning-block.video h3 { color: #a371f7; }

.video-pre {
  margin: 6px 0 0 !important;
  font-weight: 600;
  color: var(--text-secondary) !important;
}

.video-frame {
  position: relative;
  width: 100%;
  margin: var(--s-3) 0 var(--s-2);
  aspect-ratio: 16 / 9;
  border-radius: var(--r-sm);
  overflow: hidden;
  background: #000;
  border: 1px solid var(--border-default);
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-meta {
  margin: 0 !important;
  font-size: 13px;
  color: var(--text-muted) !important;
}

.video-meta a { color: var(--accent-blue); font-weight: 600; }

/* === Embudo público: tarjeta CTA y pantalla de cierre === */

.cta-card {
  display: grid;
  gap: var(--s-3);
  padding: var(--s-5);
  border: 1px solid rgba(245, 130, 31, 0.35);
  border-radius: var(--r-md);
  background:
    linear-gradient(135deg, var(--bg-tint-blue), var(--bg-tint-green)),
    var(--bg-elev-1);
  box-shadow: var(--shadow-raised);
}

.cta-card h3 { font-size: 18px; }
.cta-card p { margin: 0; color: var(--text-secondary); max-width: 70ch; }

.cta-card .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  margin-top: var(--s-1);
}

.cta-note { font-size: 13px; color: var(--text-muted); }

.complete-screen {
  display: grid;
  gap: var(--s-4);
  justify-items: center;
  text-align: center;
  padding: var(--s-7) var(--s-5);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  background: var(--bg-elev-1);
  box-shadow: var(--shadow-raised);
}

.complete-screen .complete-badge {
  display: inline-grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: var(--r-full);
  background: var(--bg-tint-green);
  color: var(--text-success);
  font-size: 32px;
}

.complete-screen h2 { font-size: 26px; }
.complete-screen p { margin: 0; color: var(--text-muted); max-width: 60ch; }

.complete-screen .complete-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  justify-content: center;
}

.complete-screen .cta-card { text-align: left; width: min(100%, 640px); }

/* ============================================================
   RUTA GUIADA — shell para aprender un tema en frío, de principio a fin.
   Reemplaza el "tablero de misiones" por: (1) una RUTA con los pasos en
   orden, y (2) cada PASO como una sola página continua. Columna de lectura
   centrada y angosta para reforzar la sensación de "un solo camino".
   ============================================================ */

/* El shell maneja su propio grid; anulamos el grid base de .study-app */
.study-app[data-view] { display: block; }

.guide-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: var(--s-5);
  align-items: start;
}

.guide-main { min-width: 0; display: grid; gap: var(--s-5); }
.guide-main > * { min-width: 0; }

.main-bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s-3); flex-wrap: wrap;
}
.main-bar .step-head-meta { flex: 1 1 auto; min-width: 0; max-width: 520px; }

/* --- Barra lateral (TOC) sticky --- */
.toc {
  position: sticky;
  top: var(--s-4);
  align-self: start;
  max-height: calc(100vh - 2 * var(--s-4));
  overflow-y: auto;
  padding: var(--s-4);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  background: var(--bg-elev-1);
  box-shadow: var(--shadow-raised);
}
.toc-head { display: flex; align-items: center; justify-content: space-between; gap: var(--s-2); }
.toc-home { padding: 4px 8px; font-size: 13px; }
.toc-progress {
  font-size: 12px; font-weight: 700; color: var(--text-muted);
  padding: 2px 8px; border: 1px solid var(--border-default); border-radius: var(--r-full);
}
.toc-close-btn { display: none; padding: 4px 10px; }
.toc-kicker { margin: var(--s-3) 0 var(--s-2); font-size: 12px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent-blue); }

.toc-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s-1); }
.toc-step { margin: 0; }
.toc-step-head {
  display: flex; align-items: center; gap: var(--s-2);
  width: 100%; text-align: left;
  padding: 6px 8px; border: 0; border-radius: var(--r-sm);
  background: transparent; color: var(--text-primary); font: inherit; font-weight: 600; cursor: pointer;
}
.toc-step-head:hover { background: var(--bg-tint-subtle); }
.toc-step.is-current > .toc-step-head { background: var(--bg-tint-blue); color: var(--accent-blue); }
.toc-step-num {
  display: inline-grid; place-items: center; flex: 0 0 auto;
  width: 22px; height: 22px; border-radius: var(--r-full);
  background: var(--bg-tint-subtle); color: var(--text-muted);
  font-size: 12px; font-weight: 700; border: 1px solid var(--border-default);
}
.toc-step.is-done .toc-step-num { background: var(--bg-tint-green); color: var(--text-success); border-color: rgba(57, 181, 74, 0.4); }
.toc-step.is-current .toc-step-num { background: var(--accent-blue); color: #fff; border-color: var(--accent-blue); }
.toc-step-title { font-size: 13px; line-height: 1.25; }

.toc-subs { list-style: none; margin: 2px 0 6px; padding: 0 0 0 30px; display: grid; gap: 1px; }
.toc-sub {
  display: flex; align-items: flex-start; gap: 6px;
  width: 100%; text-align: left;
  padding: 4px 8px; border: 0; border-radius: var(--r-sm);
  background: transparent; color: var(--text-secondary); font: inherit; font-size: 12.5px; line-height: 1.3; cursor: pointer;
}
.toc-sub:hover { background: var(--bg-tint-subtle); color: var(--text-primary); }
.toc-sub-mark { flex: 0 0 auto; color: var(--text-disabled); font-weight: 700; }
.toc-sub.is-done .toc-sub-mark { color: var(--text-success); }
.toc-sub.is-done .toc-sub-text { color: var(--text-muted); }

.toc-backdrop { display: none; }
.toc-toggle { display: none; }

/* --- Mobile: el temario se vuelve un cajón deslizable --- */
@media (max-width: 960px) {
  .guide-shell { grid-template-columns: 1fr; }
  .toc {
    position: fixed; top: 0; left: 0; z-index: 60;
    width: min(86vw, 320px); height: 100vh; max-height: 100vh;
    border-radius: 0; border-width: 0 1px 0 0;
    transform: translateX(-105%); transition: transform 220ms ease;
  }
  .guide-shell.toc-open .toc { transform: translateX(0); }
  .toc-close-btn { display: inline-flex; }
  .toc-backdrop {
    display: block; position: fixed; inset: 0; z-index: 55;
    background: rgba(0, 0, 0, 0.5); opacity: 0; pointer-events: none; transition: opacity 220ms ease;
  }
  .guide-shell.toc-open .toc-backdrop { opacity: 1; pointer-events: auto; }
  .toc-toggle { display: inline-flex; }
}

/* --- Hero de la ruta --- */
.path-hero {
  display: grid;
  gap: var(--s-3);
  padding: clamp(20px, 4vw, 36px);
  border: 1px solid rgba(245, 130, 31, 0.30);
  border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--bg-tint-blue), var(--bg-tint-green)), var(--bg-elev-1);
  box-shadow: var(--shadow-raised);
}
.path-hero h2 { font-size: clamp(22px, 3vw, 30px); max-width: 22ch; }
.path-lead { margin: 0; max-width: 64ch; color: var(--text-secondary); font-size: clamp(16px, 1.6vw, 18px); line-height: 1.7; }
.path-how { margin: 0; max-width: 64ch; color: var(--text-muted); font-size: 15px; line-height: 1.6; }
.path-hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3); margin-top: var(--s-2); }
.path-hero-actions .primary-button { min-height: 46px; padding: 10px 22px; font-size: 15px; }
.path-progress-chip { font-size: 13px; font-weight: 600; color: var(--text-muted); }

/* --- Roadmap vertical (los 5 pasos en orden) --- */
.path-roadmap { display: grid; gap: var(--s-2); }

.path-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--s-4);
  width: 100%;
  padding: var(--s-4) var(--s-5);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  background: var(--bg-elev-1);
  color: var(--text-primary);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color 140ms ease, transform 140ms ease, background 140ms ease;
}
.path-step:hover, .path-step:focus-visible { border-color: var(--accent-blue); transform: translateY(-1px); outline: none; }
.path-step.is-active { border-color: rgba(245, 130, 31, 0.5); background: var(--bg-tint-blue); }

.path-step-num {
  display: inline-grid; place-items: center;
  width: 36px; height: 36px;
  border-radius: var(--r-full);
  border: 1px solid var(--border-default);
  background: var(--bg-tint-subtle);
  color: var(--text-muted);
  font-weight: 700; font-size: 16px;
}
.path-step.is-active .path-step-num { background: var(--accent-blue); color: #fff; border-color: var(--accent-blue); }
.path-step.is-done .path-step-num { background: var(--bg-tint-green); color: var(--text-success); border-color: rgba(57, 181, 74, 0.4); }

.path-step-body { display: grid; gap: 3px; min-width: 0; }
.path-step-body > strong { font-size: 16px; font-weight: 600; }
.path-step-obj { color: var(--text-muted); font-size: 14px; }
.path-step-status { font-size: 12px; font-weight: 600; letter-spacing: 0.02em; color: var(--text-muted); }
.path-step.is-active .path-step-status { color: var(--accent-blue); }
.path-step.is-done .path-step-status { color: var(--text-success); }
.path-step-arrow { color: var(--text-muted); font-size: 18px; }

/* --- Cabecera del paso (paso N de 5 + progreso global) --- */
.step-head {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-4);
  padding: var(--s-3) var(--s-4);
  border: 1px solid var(--border-default); border-radius: var(--r-md);
  background: var(--bg-elev-1); box-shadow: var(--shadow-raised);
}
.step-head-meta { display: grid; gap: 6px; flex: 1 1 auto; min-width: 0; max-width: 520px; }
.step-kicker { font-size: 12px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent-blue); }
.step-progress { height: 6px; border-radius: var(--r-full); background: var(--progress-track); overflow: hidden; }
.step-progress > i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent-blue), var(--accent-green)); transition: width 240ms ease; }

/* --- Lección: la enseñanza FLUYE como artículo, no como cuadros apilados.
   Solo "la idea clave" lleva un resaltado ligero; el video va sin caja. --- */
.lesson {
  display: grid;
  gap: var(--s-4);
  padding: 0 var(--s-2);
}
.lesson > h2 { font-size: clamp(24px, 3vw, 30px); line-height: 1.2; max-width: 24ch; }
.lesson .module-kicker { margin-bottom: 0; }

.lesson-intro {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(17px, 1.8vw, 19px);
  line-height: 1.7;
  color: var(--text-secondary);
}

.key-idea {
  display: grid;
  gap: 4px;
  max-width: 70ch;
  padding: var(--s-3) var(--s-4);
  border-left: 3px solid var(--accent-blue);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--bg-tint-blue);
}
.key-idea-label {
  font-size: 12px; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--accent-blue);
}
.key-idea p { margin: 0; color: var(--text-primary); font-size: 16px; line-height: 1.6; }

.lesson-example {
  margin: 0;
  max-width: 64ch;
  font-size: 16px; line-height: 1.7;
  color: var(--text-secondary);
}
.lesson-example strong { color: var(--text-primary); }

/* Video dentro de la lección: marco suave, sin caja pesada */
.lesson .learning-block.video {
  border: 0; padding: 0; background: transparent;
  display: grid; gap: var(--s-2); max-width: 760px;
}
.lesson .learning-block.video h3 { font-size: 13px; }

/* --- Práctica del paso (retos apilados en línea) --- */
.step-practice {
  display: grid; gap: var(--s-4);
  padding-top: var(--s-5);
  border-top: 1px solid var(--border-soft);
}
.practice-header > h3 { font-size: 18px; }
.practice-header > p { margin: 4px 0 0; color: var(--text-muted); }

.practice-item { display: grid; gap: var(--s-2); }
.practice-item .challenge-card { width: 100%; }
.practice-num { display: flex; align-items: center; gap: var(--s-2); margin: 0; font-size: 13px; font-weight: 600; color: var(--text-muted); }
.practice-done { display: none; color: var(--text-success); }
.practice-item.is-done .practice-done { display: inline; }
.practice-item.is-done .challenge-card { border-color: rgba(57, 181, 74, 0.45); }

/* --- Cierre del paso: avanza al siguiente con inercia --- */
.next-step-strip {
  display: grid; gap: var(--s-3);
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid rgba(245, 130, 31, 0.30); border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--bg-tint-blue), var(--bg-tint-green)), var(--bg-elev-1);
  box-shadow: var(--shadow-raised);
}
.step-count { margin: 0; font-weight: 600; color: var(--text-secondary); }
.next-step-actions { display: flex; flex-wrap: wrap; gap: var(--s-2); }
.next-step-actions .primary-button { min-height: 46px; }

@media (max-width: 760px) {
  .step-head { flex-direction: column; align-items: stretch; }
  .path-step { grid-template-columns: 36px minmax(0, 1fr); }
  .path-step-arrow { display: none; }
}

/* ============================================================
   ESTÁNDAR VISUAL aprueba.net v2 — "C energético" (ADR 0018)
   Overrides al final: a igual especificidad, gana la regla más tardía.
   Re-expresa el shell existente con la identidad de marca:
   cuadrícula de cuaderno + marcador naranja, botón sticker,
   pista de pasos con roles de color (naranja=acción, navy=ejercicio,
   verde=éxito, negro=estructura). Referencia: docs/templates/design-reference.html
   ============================================================ */

/* --- Topbar: lockup de marca + título display con marcador --- */
.topbar { border-bottom: 0; min-height: auto; padding-top: var(--s-5); padding-bottom: 0; background: transparent; backdrop-filter: none; }
.brand-lockup { display: grid; gap: 6px; }
.brand-mark { font-size: 18px; font-weight: 800; letter-spacing: -0.02em; color: var(--ink-strong); }
.brand-mark > span { color: var(--accent-orange); }
.topbar h1 {
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.04;
  color: var(--ink-strong);
  text-wrap: balance;
}
.topbar h1 > mark {
  background: var(--accent-orange);
  color: #fff;
  padding: 0 0.12em;
  border-radius: 6px;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
/* Contador de progreso → verde de marca (éxito) */
.status-pill {
  min-width: 0;
  border-color: rgba(57, 181, 74, 0.3);
  background: var(--ok-tint);
  color: var(--ok-deep);
  font-weight: 700;
}

/* --- Botón sticker (CTA primario del estándar) --- */
.primary-button {
  border: 2px solid var(--ink-strong);
  background: var(--accent-orange);
  border-radius: 12px;
  font-weight: 700;
  box-shadow: var(--shadow-hard);
}
.primary-button:hover,
.primary-button:focus-visible {
  background: var(--accent-orange-hover);
  border-color: var(--ink-strong);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink-strong);
}
.primary-button:active { transform: translate(0, 0); box-shadow: 2px 2px 0 var(--ink-strong); }

/* --- Hero de la ruta: cuadrícula de cuaderno + borde fuerte --- */
.path-hero {
  border: 2px solid var(--ink-strong);
  border-radius: var(--r-hero, 22px);
  background:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
    #fff;
  background-size: 32px 32px, 32px 32px, auto;
  box-shadow: none;
  padding: clamp(28px, 4vw, 52px);
}
.path-hero h2 {
  font-size: clamp(30px, 5vw, 50px);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.04;
  color: var(--ink-strong);
}

/* --- Pista de pasos: borde fuerte + número grande + roles de color --- */
.path-step {
  border: 2px solid var(--ink-strong);
  border-radius: var(--r-card, 16px);
  background: #fff;
}
.path-step:hover, .path-step:focus-visible {
  border-color: var(--ink-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hard);
}
.path-step.is-active { border-color: var(--ink-strong); background: var(--accent-orange); color: #fff; }
.path-step.is-active .path-step-obj,
.path-step.is-active .path-step-status { color: rgba(255,255,255,0.92); }
.path-step-num {
  width: 44px; height: 44px;
  border: 2px solid var(--ink-strong);
  border-radius: 12px;
  background: var(--cream, #FFF3E7);
  color: var(--accent-deep, #C75D08);
  font-size: 22px; font-weight: 800;
}
.path-step.is-active .path-step-num { background: #fff; color: var(--accent-deep, #C75D08); border-color: #fff; }
.path-step.is-done .path-step-num { background: var(--ok-tint); color: var(--ok-deep); border-color: var(--ok-deep); }
.path-step.is-done .path-step-status { color: var(--ok-deep); font-weight: 700; }

/* --- Modo ejercicio: cabecera del paso en navy (separa resolver de leer) --- */
.step-head {
  border: 2px solid var(--ink-strong);
  border-radius: var(--r-card, 16px);
  background: var(--bg-exercise);
  box-shadow: none;
}
.step-kicker { color: #fff; }
.step-head-meta > .step-progress { background: rgba(255,255,255,0.25); }
.step-progress > i { background: var(--accent-orange); }
/* el texto "Paso N de 5" dentro de la cabecera navy */
.step-head, .step-head .step-count, .step-head p { color: #fff; }

/* --- Tarjetas de reto con borde de marca --- */
.practice-item .challenge-card { border: 2px solid var(--border-default); border-radius: var(--r-card, 16px); }
.practice-item.is-done .challenge-card { border-color: var(--ok); background: var(--ok-tint); }

/* --- Idea clave: marcador en vez de barra lateral (anti-side-stripe) --- */
.key-idea {
  border-left: 0;
  border: 1px solid rgba(245, 130, 31, 0.3);
  border-radius: var(--r-sm);
  background: var(--cream, #FFF3E7);
}

/* --- TOC: paso actual en naranja, completado en verde --- */
.toc-step.is-current > .toc-step-head { background: var(--cream, #FFF3E7); color: var(--accent-deep, #C75D08); }
.toc-step.is-current .toc-step-num { background: var(--accent-orange); border-color: var(--accent-orange); }

/* --- Embudo: CTA y cierre con identidad de marca --- */
.cta-card, .next-step-strip {
  border: 2px solid var(--ink-strong);
  border-radius: var(--r-card, 16px);
  background: var(--cream, #FFF3E7);
  box-shadow: none;
}
.complete-screen { border: 2px solid var(--ink-strong); border-radius: var(--r-hero, 22px); box-shadow: none; }

@media (max-width: 680px) {
  .primary-button { box-shadow: 3px 3px 0 var(--ink-strong); }
  .primary-button:hover, .primary-button:focus-visible { box-shadow: 5px 5px 0 var(--ink-strong); }
}