/* === SYNKRO ACADEMY — Sistema de Diseño v2.0 === */
/* Paleta: Warm-Slate + Sage-Sync (calibrada para baja fatiga visual, AA) */

:root {
  --bg-base: #12171F;
  --bg-elevated: #1A2029;
  --bg-card: rgba(255, 255, 255, 0.025);
  --bg-code: #0A0E12;

  --text-primary: #C9D1D9;
  --text-secondary: #8B949E;
  --text-heading: #F0F6FC;

  --accent-sage: #6FBBAE;
  --accent-sage-dim: rgba(111, 187, 174, 0.15);
  --accent-sage-bright: #8FD4C7;

  --warn-amber: #D29922;
  --warn-bg: rgba(210, 153, 34, 0.08);
  --danger-red: #DA3633;
  --danger-bg: rgba(218, 54, 51, 0.08);
  --info-blue: #58A6FF;
  --info-bg: rgba(88, 166, 255, 0.08);
  --success-green: #3FB950;
  --success-bg: rgba(63, 185, 80, 0.08);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-default: rgba(255, 255, 255, 0.12);
  --border-focus: rgba(111, 187, 174, 0.4);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.3), 0 2px 4px -2px rgba(0,0,0,0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4), 0 4px 6px -4px rgba(0,0,0,0.3);

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
}

/* === RESET & BASE === */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === TIPOGRAFÍA === */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-heading);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

h1 { font-size: 2rem; margin-bottom: 0.5rem; letter-spacing: 0.03em; }
h2 { font-size: 1.5rem; margin-top: 2.5rem; margin-bottom: 1rem; letter-spacing: 0.02em; }
h3 { font-size: 1.2rem; margin-top: 1.8rem; margin-bottom: 0.75rem; }
h4 { font-size: 1rem; margin-top: 1.5rem; margin-bottom: 0.5rem; color: var(--accent-sage); }

p { margin-bottom: 1.2rem; }

a {
  color: var(--accent-sage);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
a:hover { border-bottom-color: var(--accent-sage); color: var(--accent-sage-bright); }

strong { color: var(--text-heading); font-weight: 600; }
em { color: var(--accent-sage-bright); font-style: italic; }

/* === LAYOUT === */
.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.container-wide { max-width: 1200px; margin: 0 auto; padding: 2rem 1.5rem 4rem; }

/* === HEADER === */
.academy-header {
  border-bottom: 1px solid var(--border-default);
  padding: 2.5rem 0;
  margin-bottom: 3rem;
  text-align: center;
}
.academy-header .crest {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--accent-sage);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}
.academy-header .crest::before,
.academy-header .crest::after {
  content: "";
  width: 30px;
  height: 1px;
  background: var(--accent-sage);
  opacity: 0.5;
}
.academy-header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}
.academy-header .tagline {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* === NAVIGATION BREADCRUMBS === */
.breadcrumbs {
  display: flex;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  align-items: center;
}
.breadcrumbs a { color: var(--text-secondary); border: none; }
.breadcrumbs a:hover { color: var(--accent-sage); }
.breadcrumbs .sep { opacity: 0.4; }
.breadcrumbs .current { color: var(--text-primary); }

/* === CARDS === */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  transition: border-color 0.2s ease;
}
.card:hover { border-color: var(--border-default); }

.card-title {
  font-size: 1.1rem;
  color: var(--text-heading);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Tabla clave-valor usada en prácticas guiadas (ej. campos del nodo Set) */
.kv-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.25rem;
  font-size: 0.95rem;
  background-color: var(--bg-code);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.kv-table th,
.kv-table td {
  text-align: left;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--border-subtle);
}
.kv-table th {
  font-weight: 600;
  color: var(--accent-sage);
  background-color: rgba(255, 255, 255, 0.03);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.kv-table tr:last-child td { border-bottom: none; }
.kv-table code { font-size: 0.95em; }

/* Lista con filas label/valor para prácticas guiadas (listas numeradas con config) */
ol > li:has(> .kv-row) { margin-bottom: 0.85rem; }
.kv-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0.75rem 1rem;
  padding: 0.6rem 0.9rem;
  background-color: var(--bg-code);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  font-size: 0.95rem;
  align-items: baseline;
}
.kv-row .kv-label {
  font-weight: 600;
  color: var(--accent-sage);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}
.kv-row .kv-value { color: var(--text-primary); line-height: 1.5; }
.kv-row .kv-value code { font-size: 0.95em; }
@media (max-width: 640px) {
  .kv-row { grid-template-columns: 1fr; gap: 0.25rem; }
  .kv-row .kv-label { white-space: normal; }
}

/* === CALLOUTS (cajas de aprendizaje) === */
.callout {
  border-left: 3px solid var(--accent-sage);
  background-color: var(--accent-sage-dim);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.callout-title {
  font-weight: 600;
  color: var(--accent-sage-bright);
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.callout.warn { border-left-color: var(--warn-amber); background-color: var(--warn-bg); }
.callout.warn .callout-title { color: var(--warn-amber); }
.callout.danger { border-left-color: var(--danger-red); background-color: var(--danger-bg); }
.callout.danger .callout-title { color: var(--danger-red); }
.callout.info { border-left-color: var(--info-blue); background-color: var(--info-bg); }
.callout.info .callout-title { color: var(--info-blue); }
.callout.success { border-left-color: var(--success-green); background-color: var(--success-bg); }
.callout.success .callout-title { color: var(--success-green); }

/* === CODE BLOCKS === */
code {
  font-family: var(--font-mono);
  background-color: var(--bg-code);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.875em;
  color: #e6edf3;
  border: 1px solid var(--border-subtle);
}

pre {
  background-color: var(--bg-code);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border-subtle);
}
pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.875rem;
  line-height: 1.5;
}

/* Syntax tokens */
.tok-key { color: #FF7B72; }
.tok-str { color: #A5D6FF; }
.tok-num { color: #79C0FF; }
.tok-bool { color: #D2A8FF; }
.tok-com { color: #8B949E; font-style: italic; }
.tok-pp { color: #7EE787; } /* property */

/* === TABLES === */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: var(--bg-card);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
th {
  background-color: var(--bg-elevated);
  text-align: left;
  padding: 0.85rem 1rem;
  color: var(--text-heading);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-default);
}
td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: top;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background-color: rgba(255,255,255,0.02); }

/* === CHECKLIST — Sistema de Progreso === */
.checklist {
  list-style: none;
  margin: 1.5rem 0;
  padding: 1.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}
.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.6rem 0;
  cursor: pointer;
  user-select: none;
  border-radius: var(--radius-sm);
  padding-left: 0.5rem;
  padding-right: 0.5rem;
  transition: background-color 0.15s ease;
}
.checklist-item:hover { background-color: rgba(255,255,255,0.03); }
.checklist-item input[type="checkbox"] {
  appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--text-secondary);
  border-radius: 4px;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  margin-top: 2px;
  transition: all 0.2s ease;
}
.checklist-item input[type="checkbox"]:checked {
  background-color: var(--accent-sage);
  border-color: var(--accent-sage);
}
.checklist-item input[type="checkbox"]:checked::after {
  content: "✓";
  position: absolute;
  left: 2px;
  top: -1px;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
}
.checklist-item input[type="checkbox"]:checked ~ .checklist-label {
  color: var(--text-secondary);
  text-decoration: line-through;
  text-decoration-color: rgba(139, 148, 158, 0.5);
}
.checklist-label { flex: 1; }

/* === ACCORDION === */
.accordion {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  margin: 1rem 0;
  overflow: hidden;
}
.accordion-trigger {
  width: 100%;
  background: var(--bg-elevated);
  border: none;
  color: var(--text-heading);
  padding: 1rem 1.25rem;
  text-align: left;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-sans);
}
.accordion-trigger:hover { background-color: rgba(255,255,255,0.04); }
.accordion-trigger .icon {
  transition: transform 0.2s ease;
  color: var(--accent-sage);
}
.accordion-trigger[aria-expanded="true"] .icon { transform: rotate(90deg); }
.accordion-panel {
  padding: 1.25rem;
  background-color: var(--bg-card);
  display: none;
}
.accordion-panel.open { display: block; }

/* === PHASE / MODULE BADGES === */
.badge {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.badge.fase-1 { background-color: var(--info-bg); color: var(--info-blue); }
.badge.fase-2 { background-color: var(--success-bg); color: var(--success-green); }
.badge.fase-3 { background-color: var(--warn-bg); color: var(--warn-amber); }
.badge.dia { background-color: var(--accent-sage-dim); color: var(--accent-sage); }

/* ==========================================================================
   PROGRESS ENGINE — barra de lectura, estados de tarjetas, barra del máster
   ========================================================================== */

/* --- Barra de lectura por módulo: se fija al top del viewport --- */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--bg-elevated);
  z-index: 1000;
  pointer-events: none; /* no bloquear clicks */
}
.read-progress-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent-sage), var(--accent-sage-bright));
  transition: width 0.1s linear; /* suave pero fiel al scroll */
}
.read-progress.is-complete .read-progress-fill {
  background: linear-gradient(90deg, var(--success-green), #6EEA8A);
}

/* --- Estado de cada tarjeta de módulo en el dashboard --- */
.module-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  margin-top: 0.2rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-subtle);
}
.module-status.is-todo      { color: var(--text-secondary); }
.module-status.is-progress  { color: var(--accent-sage); }
.module-status.is-done      { color: var(--success-green); font-weight: 600; }

/* mini-barra dentro de tarjeta "En curso" */
.module-status-bar {
  flex: 1;
  height: 4px;
  background-color: var(--bg-elevated);
  border-radius: 2px;
  overflow: hidden;
}
.module-status-bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-sage), var(--accent-sage-bright));
  border-radius: 2px;
}

/* Borde sutil de color según estado en la tarjeta */
.module-card.is-done {
  border-left: 3px solid var(--success-green);
}
.module-card.is-progress {
  border-left: 3px solid var(--accent-sage);
}

/* --- Headers de fase en el dashboard --- */
.fase-header {
  margin: 2.5rem 0 0.25rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.fase-header h3 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--text-heading);
}
.fase-header .badge { flex-shrink: 0; }
.fase-header .fase-meta {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-left: auto; /* se pega al final a la derecha */
}

/* --- Barra general del máster (index) --- */
.master-progress {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.4rem;
  margin: 1.5rem 0 2rem;
}
.master-progress-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  margin-bottom: 0.6rem;
}
.master-progress-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-heading);
}
.master-progress-count {
  font-size: 0.82rem;
  color: var(--accent-sage);
  font-weight: 500;
}
.master-progress-track {
  height: 10px;
  background-color: var(--bg-elevated);
  border-radius: 5px;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}
.master-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-sage), var(--accent-sage-bright));
  border-radius: 5px;
  transition: width 0.6s ease;
}
.master-progress.is-complete .master-progress-fill {
  background: linear-gradient(90deg, var(--success-green), #6EEA8A);
}
.master-progress.is-complete .master-progress-count { color: var(--success-green); }

/* --- Tarjetas de lab: recomendación de cuándo hacerlo --- */
.lab-meta {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
  padding-top: 0.45rem;
  border-top: 1px solid var(--border-subtle);
}

/* Tarjeta de laboratorio que es GATE (puerta de fase) */
.module-card.is-gate {
  border-left: 3px solid var(--warn-amber);
}

/* --- Tarjeta de módulo BLOQUEADA (gate pendiente) --- */
.module-card.is-locked {
  border-color: var(--warn-amber);
  background-color: rgba(210, 153, 34, 0.04);
  opacity: 0.85;
  position: relative;
}
.module-lock {
  display: block;
  font-size: 0.76rem;
  color: var(--warn-amber);
  font-weight: 600;
  letter-spacing: 0.03em;
  padding-top: 0.5rem;
  border-top: 1px solid var(--warn-bg);
  margin-top: 0.25rem;
}
.is-locked-link {
  cursor: pointer;
  color: var(--warn-amber);
}
.is-locked-link:hover {
  background-color: var(--warn-amber);
  color: #12171F;
}

/* Estado visual en pager cuando está bloqueada la siguiente */
.lesson-pager-link.is-locked {
  border-color: var(--warn-amber);
  background-color: rgba(210, 153, 34, 0.06);
  opacity: 0.95;
  cursor: pointer;
}
.lesson-pager-link.is-locked .lesson-pager-dir { color: var(--warn-amber); }
.lesson-pager-link.is-locked:hover {
  border-color: var(--warn-amber);
  transform: none; /* no elevar: está bloqueado */
}

/* --- Overlay bloqueo del Módulo 17 (o cualquiera con gate no resuelto) --- */
.lesson-gate-overlay {
  padding: 3rem 1rem 2rem;
}
.lesson-gate-card {
  max-width: 520px;
  margin: 0 auto;
  background-color: rgba(210, 153, 34, 0.05);
  border: 1px solid var(--warn-amber);
  border-radius: var(--radius-lg);
  padding: 2rem 2.25rem;
  text-align: center;
}
.lesson-gate-card h2 {
  color: var(--warn-amber);
  margin: 0.5rem 0 1rem;
  font-size: 1.3rem;
}
.lesson-gate-card p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}
.lesson-gate-card .module-link {
  display: inline-flex;
  margin-top: 1rem;
}

/* ==========================================================================
   PÁGINA DE ACCESO (acceso.html) — diseño premium para recibir leads
   ========================================================================== */

.access-container {
  max-width: 660px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

.access-hero { text-align: center; margin-bottom: 2rem; }
.access-brand img { display: block; margin: 0 auto 0.75rem; }
.access-brand-tag {
  font-size: 0.78rem;
  color: var(--accent-sage);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
  margin: 0 0 0.5rem;
}
.access-hero h1 {
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  color: var(--text-heading);
  margin: 0.5rem 0 0.5rem;
}
.access-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 0;
}

.access-preview {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  margin-bottom: 2rem;
}
.access-preview h2 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
  color: var(--text-heading);
}
.access-benefits {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}
.access-benefits li {
  font-size: 0.93rem;
  color: var(--text-primary);
  padding-left: 1.5rem;
  position: relative;
}
.access-benefits li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent-sage);
  font-weight: 700;
}

.access-form-box {
  background: var(--bg-card);
  border: 1px solid var(--accent-sage);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
}
.access-form-box h2 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
  color: var(--text-heading);
}
.access-form-box p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}
.access-label {
  display: block;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--accent-sage);
  margin-bottom: 0.4rem;
}
#access-key {
  width: 100%;
  padding: 0.85rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 1rem;
  margin-bottom: 1rem;
  outline: none;
  transition: border-color 0.2s ease;
  box-sizing: border-box;
}
#access-key:focus { border-color: var(--accent-sage); box-shadow: 0 0 0 3px var(--accent-sage-dim); }
.access-btn-full { width: 100%; text-align: center; justify-content: center; }

.access-error {
  background: var(--danger-bg);
  border-left: 3px solid var(--danger-red);
  padding: 0.85rem 1rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--danger-red);
  font-size: 0.9rem;
  margin-top: 1rem;
}

.access-hint {
  margin-top: 1rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.access-request {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
  text-align: center;
}
.access-request h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
  color: var(--text-heading);
}
.access-request p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}
.access-request .cert-btn { display: inline-block; margin: 0.25rem 0.5rem; }

.access-footer {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* --- Botón "Marcar lab como completado" --- */
.lab-completion .lab-complete-btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.7rem 1.4rem;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-heading);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  cursor: not-allowed;
  opacity: 0.6;
  transition: all 0.2s ease;
}
.lab-completion .lab-complete-btn.is-ready {
  background-color: var(--accent-sage-dim);
  border-color: var(--accent-sage);
  color: var(--accent-sage);
  cursor: pointer;
  opacity: 1;
}
.lab-completion .lab-complete-btn.is-ready:hover {
  background-color: var(--accent-sage);
  color: #0D1117;
}
.lab-completion .lab-complete-btn.is-done {
  background-color: var(--success-bg);
  border-color: var(--success-green);
  color: var(--success-green);
  cursor: default;
}
.lab-completion-hint {
  margin: 0.6rem 0 0;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   PÁGINA DE GRADUACIÓN — felicitacion.html
   Solo accesible tras completar 17/17 módulos + 8/8 labs
   ========================================================================== */

/* --- Card dorada en el index (visible solo si graduado) --- */
.module-card--graduacion {
  display: none;  /* escondida por defecto; progress.js la muestra si graduado */
  background: linear-gradient(135deg, rgba(210, 153, 34, 0.1), rgba(210, 153, 34, 0.03));
  border: 2px solid var(--warn-amber);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}
.module-card--graduacion.is-visible { display: flex; flex-direction: column; gap: 0.75rem; }
.module-card--graduacion::before {
  content: "✦";
  position: absolute;
  top: -8px;
  right: -8px;
  font-size: 5rem;
  opacity: 0.1;
  color: var(--warn-amber);
  font-family: serif;
}
.module-card--graduacion .module-title { color: var(--warn-amber); font-size: 1.15rem; }
.module-card--graduacion .module-link {
  background-color: var(--warn-amber);
  color: #12171F;
  font-weight: 600;
}
.module-card--graduacion .module-link:hover { background-color: #F0B952; transform: translateY(-2px); }

/* --- Canvas de confetti: cubre toda la página, sin pointer-events --- */
.confetti-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 999;
}

/* --- Stage de graduación --- */
.grad-hero {
  text-align: center;
  padding: 3.5rem 1.5rem 2rem;
  border-bottom: 1px solid var(--border-default);
}
.grad-hero .lesson-kicker { color: var(--warn-amber); }
.grad-hero h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  color: var(--warn-amber);
  margin: 0.5rem 0 0.75rem;
  letter-spacing: 0.02em;
}
.grad-hero .lesson-tagline { color: var(--text-secondary); max-width: 60ch; margin: 0 auto 1.5rem; }
.grad-hero .badge-grad {
  display: inline-block;
  padding: 0.4rem 1.2rem;
  background: linear-gradient(120deg, #D29922 0%, #F0B952 100%);
  color: #12171F;
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

/* --- Canvas del certificado --- */
.certificate-stage {
  max-width: 980px;
  margin: 2rem auto;
  padding: 0 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}
.certificate-wrapper {
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
}
#certificate-render {
  background: linear-gradient(160deg, #fafbfc 0%, #f0f2f5 100%);
  color: #1a202c;
  width: 100%;
  max-width: 720px;
  aspect-ratio: 1000 / 700;   /* A4 apaisado */
  padding: 2.5rem;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  font-family: 'Georgia', serif;
  box-sizing: border-box;
}
#certificate-render .cert-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px solid #6FBBAE;
  padding-bottom: 1.25rem;
}
#certificate-render .cert-logo { max-height: 65px; }
#certificate-render .cert-brand {
  text-align: right;
  line-height: 1.2;
}
#certificate-render .cert-brand-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: #1a202c;
  letter-spacing: 0.05em;
}
#certificate-render .cert-brand-tag {
  font-size: 0.7rem;
  color: #6FBBAE;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}
#certificate-render .cert-title {
  text-align: center;
  margin: 1.5rem 0;
}
#certificate-render .cert-title .cert-presented {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #718096;
}
#certificate-render .cert-title .cert-name {
  font-size: 2.25rem;
  font-weight: 700;
  color: #1a202c;
  margin: 0.5rem 0;
  letter-spacing: 0.02em;
}
#certificate-render .cert-title .cert-has-completed {
  font-size: 0.8rem;
  color: #4a5568;
  margin-bottom: 0.5rem;
}
#certificate-render .cert-title .cert-program {
  font-size: 1.05rem;
  font-weight: 600;
  color: #2d3748;
}
#certificate-render .cert-body {
  text-align: center;
  font-size: 0.82rem;
  color: #4a5568;
  line-height: 1.6;
  max-width: 480px;
  margin: 0 auto;
}
#certificate-render .cert-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-top: 1px solid #cbd5e0;
  padding-top: 1.25rem;
}
#certificate-render .cert-col {
  flex: 1;
}
#certificate-render .cert-sig {
  text-align: left;
}
#certificate-render .cert-sig .cert-sig-line {
  border-top: 1.5px solid #1a202c;
  width: 180px;
  padding-top: 0.35rem;
  margin-bottom: 0.25rem;
  font-style: italic;
  font-family: 'Georgia', serif;
  font-size: 1.05rem;
  color: #2d3748;
}
#certificate-render .cert-sig .cert-sig-role {
  font-size: 0.65rem;
  color: #718096;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
#certificate-render .cert-center {
  text-align: center;
  font-size: 0.72rem;
  color: #718096;
}
#certificate-render .cert-code-box { text-align: right; }
#certificate-render .cert-code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  font-weight: 700;
  color: #D29922;
  letter-spacing: 0.08em;
}
#certificate-render .cert-date {
  font-size: 0.72rem;
  color: #718096;
  margin-top: 0.25rem;
}
#certificate-render .cert-seal {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #D29922, #8f6a15);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

/* --- Botones de acción del certificado --- */
.cert-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
}
.cert-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.75rem 1.4rem;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-default);
  background-color: var(--bg-elevated);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s ease;
}
.cert-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.cert-btn--primary {
  background: linear-gradient(120deg, #D29922, #F0B952);
  color: #12171F;
  border-color: #F0B952;
}
.cert-btn--primary:hover { background: linear-gradient(120deg, #F0B952, #FFD082); }

/* --- Recompensas (bundle) --- */
.grad-rewards {
  max-width: 980px;
  margin: 3rem auto 2rem;
  padding: 0 1.5rem;
}
.grad-rewards h2 {
  text-align: center;
  color: var(--text-heading);
  margin-bottom: 0.5rem;
}
.grad-rewards .section-lead {
  text-align: center;
  max-width: 60ch;
  margin: 0 auto 2rem;
}
.rewards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.reward-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.4rem;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.reward-card:hover { border-color: var(--warn-amber); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.reward-card .reward-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--warn-amber), #F0B952);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #12171F;
  font-size: 1rem;
}
.reward-card .reward-title {
  font-size: 0.95rem;
  color: var(--text-heading);
  font-weight: 600;
  margin: 0;
}
.reward-card .reward-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.55;
}

/* --- CTA final --- */
.grad-cta {
  max-width: 760px;
  margin: 2rem auto 4rem;
  padding: 2rem;
  text-align: center;
  background: linear-gradient(135deg, rgba(111, 187, 174, 0.07), rgba(210, 153, 34, 0.05));
  border: 1px solid var(--accent-sage);
  border-radius: var(--radius-lg);
}
.grad-cta h2 { color: var(--accent-sage-bright); margin: 0 0 0.6rem; }
.grad-cta p { color: var(--text-secondary); margin: 0 0 1.5rem; }
.grad-cta .cert-btn { margin: 0.25rem; }

/* --- Alert si intenta entrar sin graduarse --- */
.not-graduated {
  max-width: 600px;
  margin: 5rem auto;
  padding: 2.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--warn-amber);
  border-radius: var(--radius-lg);
  text-align: center;
}
.not-graduated h1 { color: var(--warn-amber); margin: 0 0 1rem; }
.not-graduated p { color: var(--text-secondary); margin: 0.75rem 0; }
.not-graduated .lesson-back { display: inline-block; margin-top: 1.25rem; }

/* --- Responsive --- */
@media (max-width: 768px) {
  #certificate-render { padding: 1.25rem; }
  #certificate-render .cert-title .cert-name { font-size: 1.5rem; }
  #certificate-render .cert-program { font-size: 0.85rem; }
  #certificate-render .cert-footer { flex-direction: column; gap: 1rem; align-items: stretch; }
  .cert-btn { width: 100%; justify-content: center; }
  .rewards-grid { grid-template-columns: 1fr; }
}


/* ==========================================================================
   PROGRESS BAR (legacy — usada dentro de cada checklist por progress.js)
   ========================================================================== */
.progress-container {
  margin: 1.5rem 0;
}
.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}
.progress-bar {
  height: 8px;
  background-color: var(--bg-elevated);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-sage), var(--accent-sage-bright));
  border-radius: 20px;
  transition: width 0.6s ease;
  width: 0%;
}

/* === MODULE GRID (dashboard) === */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}
.module-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: all 0.25s ease;
}
.module-card:hover {
  border-color: var(--border-focus);
  transform: translateX(2px);
  box-shadow: var(--shadow-md);
}
.module-card .module-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-sage);
  letter-spacing: 0.1em;
}
.module-card .module-title {
  font-size: 1.05rem;
  color: var(--text-heading);
  font-weight: 600;
}
.module-card .module-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex-grow: 1;
  line-height: 1.5;
}
.module-card.disabled { opacity: 0.4; pointer-events: none; }

/* === ROUTE TABLE (ROADMAP DIARIO) === */
.route-table {}
.route-table th { font-size: 0.8rem; }
.route-table .day-cell { font-family: var(--font-mono); color: var(--accent-sage); font-weight: 600; width: 60px; }
.route-table .focus-cell { color: var(--text-heading); }

/* === CHALLENGE / QUIZ BOX === */
.challenge-box {
  border: 2px solid var(--accent-sage);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  margin: 2.5rem 0;
  background-color: rgba(111, 187, 174, 0.03);
}
.challenge-box .challenge-label {
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-sage);
  margin-bottom: 0.75rem;
  font-weight: 700;
}
.challenge-box h3 {
  margin-top: 0;
  color: var(--accent-sage-bright);
}

/* === FOOTER === */
.academy-footer {
  border-top: 1px solid var(--border-subtle);
  margin-top: 4rem;
  padding-top: 2rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}
.academy-footer a { color: var(--accent-sage); }

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .container { padding: 1rem 1rem 3rem; }
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.25rem; }
  .card { padding: 1.25rem; }
  .module-grid { grid-template-columns: 1fr; }
}

/* === PRINT (Cheat Sheets) === */
@media print {
  body { background: #fff; color: #000; }
  .callout { border-color: #333; }
  .no-print { display: none !important; }
}


/* ==========================================================================
   DASHBOARD / SYLLABUS — index.html
   Capa moderna añadida sobre el sistema base. Los nombres de clase son
   específicos (.hero, .modulos-section, .badge-fase-N) para no colisionar
   con los estilos legacy (.academy-header, .badge.fase-N) que siguen
   usando los módulos, cheatsheets y laboratorios internos.
   ========================================================================== */

/* --- Skip-link: visible solo al recibir foco por teclado --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.6rem 1.1rem;
  background-color: var(--accent-sage);
  color: #0D1117;
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 0.75rem; color: #0D1117; border-bottom: none; }

/* --- Helper: elemento invisible pero accesible a screenreaders --- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* --- Hero reemplaza .academy-header solo en index.html --- */
.hero {
  border-bottom: 1px solid var(--border-default);
  padding: 3.5rem 0 3rem;
  text-align: center;
}
.hero .container { padding-top: 0; padding-bottom: 0; }

.crest {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--accent-sage);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 1rem;
}
.crest-line {
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--accent-sage);
  opacity: 0.5;
}

/* Tipografía fluida con clamp(): mobile-first sin saltos bruscos */
.hero h1 {
  font-size: clamp(1.75rem, 4vw + 0.5rem, 2.75rem);
  color: var(--text-heading);
  margin: 0 0 0.65rem;
}
.tagline {
  font-size: clamp(0.95rem, 1.5vw + 0.4rem, 1.1rem);
  color: var(--text-secondary);
  margin: 0 auto;
  max-width: 52ch;
}

/* Nav de secciones interna: píldoras con hover animado */
.hero-nav {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 1.75rem;
  flex-wrap: wrap;
}
.hero-nav a {
  padding: 0.45rem 1.1rem;
  border: 1px solid var(--border-default);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}
.hero-nav a:hover {
  border-color: var(--accent-sage);
  color: var(--accent-sage);
  background-color: var(--accent-sage-dim);
  border-bottom-color: var(--accent-sage); /* cancela el underline global */
}

/* --- Cabecera de sección --- */
.section-header { margin-bottom: 1.25rem; }
.section-header h2 { margin-top: 0; margin-bottom: 0.3rem; }
.section-lead {
  color: var(--text-secondary);
  margin-bottom: 0;
  max-width: 60ch;
}

/* Espaciado vertical entre secciones, generoso y coherente */
.ruta-section  { margin-top: 2.5rem; }
.modulos-section,
.recursos-section { margin-top: 3.5rem; }

/* --- Tabla de fases: scroll horizontal en móvil, sin overflow del body --- */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-sm);
  margin-top: 1.25rem;
}
.table-wrapper:focus-visible {
  outline: 2px solid var(--accent-sage);
  outline-offset: 3px;
}
.table-wrapper .route-table { margin: 0; min-width: 540px; }

/* Detalle de celda debajo del título (reemplaza <br>) */
.cell-detail {
  display: block;
  margin-top: 0.3rem;
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.5;
}
.cell-link-sep { color: var(--text-secondary); margin: 0 0.3rem; opacity: 0.6; }

/* --- Grid de tarjetas: mobile-first con CSS Grid auto-fill --- */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
  gap: 1.1rem;
  margin-top: 1.5rem;
  padding: 0;           /* ul sin padding de lista */
  list-style: none;
}

/* --- Tarjeta de módulo --- */
.module-card {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 1.4rem 1.5rem 1.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}
.module-card:hover {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px); /* elevación vertical (antes translateX, sutil bug) */
}

.module-title {
  font-size: 1.02rem;
  margin: 0;        /* los h3 dentro de tarjeta no llevan margin-top global */
  line-height: 1.4;
}
.module-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex-grow: 1;     /* empuja el CTA al fondo, tarjetas de altura uniforme */
  margin: 0;
  line-height: 1.55;
}

/* --- CTA de tarjeta: botón con transición fluida --- */
.module-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.4rem;
  padding: 0.5rem 0.9rem;
  background-color: var(--accent-sage-dim);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent-sage);
  align-self: flex-start;
  transition: background-color 0.2s ease, color 0.2s ease, gap 0.2s ease;
}
.module-link:hover {
  background-color: var(--accent-sage);
  color: #0D1117;           /* contraste AA sobre sage */
  border-bottom-color: transparent; /* el CTA no usa underline de enlace */
  gap: 0.55rem;             /* la flecha se desplaza sutilmente */
}

/* Foco visible para navegación por teclado (WCAG 2.4.7) */
.module-link:focus-visible,
.hero-nav a:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent-sage);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   BADGES — variante renombrada sin colisión.
   Los archivos internos (módulos, cheatsheets) usan .badge.fase-1 y .badge.dia
   con los colores originales. Solo index.html usa .badge-fase-N y
   .badge-recurso, con texto más claro para cumplir contraste AA sobre fondo
   oscuro (los originales #DA3633/#D29922/#58A6FF no superan 4.5:1).
   ========================================================================== */
.badge {
  display: inline-block;
  padding: 0.22rem 0.7rem;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  white-space: nowrap;
}
.badge-fase-1  { background-color: var(--info-bg);       color: #9BC8FF; }
.badge-fase-2  { background-color: var(--success-bg);    color: #6EEA8A; }
.badge-fase-3  { background-color: var(--warn-bg);       color: #F0B952; }
.badge-recurso { background-color: var(--accent-sage-dim); color: var(--accent-sage); }
/* badge de graduación (en la card premium del index) */
.badge-grad-card {
  background: linear-gradient(120deg, #D29922, #F0B952);
  color: #12171F;
  font-weight: 700;
}

/* === Helpers para cheatsheets (eliminan inline styles) === */
.cheatsheet-warn   { color: var(--warn-amber); }
.cheatsheet-actions {
  display: block;
  margin: 2rem auto;
  padding: 0.5rem 2rem;
  background-color: var(--accent-sage-dim);
  color: var(--accent-sage);
  border: 1px solid var(--accent-sage);
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  font-family: var(--font-sans);
  transition: all 0.2s ease;
}
.cheatsheet-actions:hover {
  background-color: var(--accent-sage);
  color: #0D1117;
}
.cheatsheet-btn {
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  background-color: var(--accent-sage);
  border: none;
  color: #0D1117;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-weight: 600;
  transition: background-color 0.2s ease;
}
.cheatsheet-btn:hover { background-color: var(--accent-sage-bright); }

/* --- Footer --- */
.academy-footer {
  border-top: 1px solid var(--border-subtle);
  margin-top: 4.5rem;
  padding: 2rem 0 3rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.84rem;
}
.academy-footer p { margin: 0; }

/* ==========================================================================
   RESPONSIVE — Mobile-first: los estilos base ya son móviles;
   los breakpoints escalan hacia pantallas más grandes.
   ========================================================================== */

/* Móvil pequeño: cortesía extra al grid */
@media (max-width: 480px) {
  .module-grid { grid-template-columns: 1fr; }
}

/* Tableta: 2 columnas si caben */
@media (min-width: 640px) {
  .module-grid { grid-template-columns: repeat(auto-fill, minmax(248px, 1fr)); }
}

/* Escritorio: hero más alto, grid más suelto */
@media (min-width: 1024px) {
  .hero { padding: 4.5rem 0 3.75rem; }
  .module-grid { gap: 1.35rem; }
}


/* ==========================================================================
   PÁGINA DE LECCIÓN — .lesson-*
   Diseño premium para los módulos de contenido. Tipografía fluida y grande
   (sin "letra pequeña"), tarjetas con numeración visual, bloques de código
   limpios SIN inline styles, callouts de color con borde lateral, y un
   challenge con acento sage. Nombres .lesson-* para cero colisión.
   ========================================================================== */

/* --- Base de lección --- */
.lesson-body {
  background-color: var(--bg-base);
  /* Tipografía base de lectura: más grande que el default para legibilidad */
  font-size: 1.06rem;
  line-height: 1.75;
}

.lesson-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  max-width: 820px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 0;
  font-size: 0.84rem;
  color: var(--text-secondary);
}
.lesson-breadcrumbs a { color: var(--text-secondary); border-bottom: none; }
.lesson-breadcrumbs a:hover { color: var(--accent-sage); }
.lesson-breadcrumbs .sep { opacity: 0.35; }
.lesson-breadcrumbs .current { color: var(--text-primary); }

.lesson-header {
  max-width: 820px;
  margin: 0 auto;
  padding: 2.25rem 1.5rem 1.75rem;
  border-bottom: 1px solid var(--border-subtle);
}
.lesson-kicker {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-sage);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin: 0 0 0.5rem;
}
.lesson-header h1 {
  font-size: clamp(1.7rem, 3vw + 0.8rem, 2.4rem);
  color: var(--text-heading);
  margin: 0 0 0.5rem;
  line-height: 1.2;
}
.lesson-tagline {
  font-size: clamp(0.98rem, 1.5vw + 0.4rem, 1.1rem);
  color: var(--text-secondary);
  margin: 0 0 1.1rem;
  max-width: 58ch;
}
.lesson-meta { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.lesson-chip {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background-color: var(--accent-sage-dim);
  color: var(--accent-sage);
  font-size: 0.76rem;
  font-weight: 600;
  border-radius: 20px;
  letter-spacing: 0.04em;
}

.lesson-container {
  max-width: 820px;
  margin: 0 auto;
  padding: 1.75rem 1.5rem 3.5rem;
}

/* --- Tarjeta de lección --- */
.lesson-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  margin-bottom: 1.5rem;
  transition: border-color 0.25s ease;
}
.lesson-card:hover { border-color: var(--border-default); }

.lesson-card-head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin-bottom: 0.85rem;
}
/* Número de sección visible: separa visualmente y da ancla al estudiante */
.lesson-step {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background-color: var(--accent-sage-dim);
  color: var(--accent-sage);
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: 50%;
  line-height: 1;
}
.lesson-card-head h2 {
  font-size: 1.25rem;
  margin: 0;
  color: var(--text-heading);
  line-height: 1.35;
}

.lesson-card p { margin-bottom: 1rem; }
.lesson-card p:last-child { margin-bottom: 0; }

/* Listas base dentro de tarjetas */
.lesson-list,
.lesson-steps { padding-left: 1.2rem; margin: 0.75rem 0 1rem; }
.lesson-list li,
.lesson-steps li { margin-bottom: 0.5rem; line-height: 1.65; }
.lesson-list li:last-child,
.lesson-steps li:last-child { margin-bottom: 0; }

/* Sub-listas dentro de pasos (sin sangría decorativa extra) */
.lesson-substeps {
  list-style: none;
  padding-left: 0;
  margin: 0.6rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}
.lesson-substeps li {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.55rem 0.85rem;
  background-color: var(--bg-code);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  margin-bottom: 0;
}
.lesson-kv {
  flex-shrink: 0;
  font-weight: 700;
  font-size: 0.75rem;
  color: var(--accent-sage);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  min-width: 110px;
}

/* --- Código inline dentro de texto --- */
.lesson-code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background-color: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  color: #e6edf3;
}

/* kbd para atajos de teclado */
kbd {
  font-family: var(--font-mono);
  font-size: 0.8em;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0.05rem 0.4rem;
}

/* --- Grid "Las 4 partes del nodo HTTP" --- */
.lesson-parts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
  list-style: none;
  padding: 0;
  margin: 1.1rem 0 1.35rem;
  counter-reset: part;
}
.lesson-part {
  display: flex;
  gap: 0.8rem;
  padding: 1rem 1.1rem;
  background-color: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  align-items: flex-start;
  transition: border-color 0.2s ease;
}
.lesson-part:hover { border-color: var(--border-focus); }
.lesson-part-num {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background-color: var(--accent-sage-dim);
  color: var(--accent-sage);
  font-size: 0.72rem;
  font-weight: 700;
  border-radius: 50%;
  margin-top: 2px;
}
.lesson-part-title {
  font-size: 0.9rem;
  color: var(--text-heading);
  margin: 0 0 0.3rem;
  font-weight: 600;
}
.lesson-part p { font-size: 0.83rem; color: var(--text-secondary); margin: 0; line-height: 1.55; }

/* --- Bloque de código profesional (sin inline styles) --- */
.lesson-codeblock {
  background-color: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 1.1rem 0 1.35rem;
}
.lesson-codeblock-label {
  padding: 0.55rem 1.1rem;
  background-color: var(--bg-elevated);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-sage);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-subtle);
  margin: 0;
}
.lesson-codeblock-pre {
  margin: 0;
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  background: none;
  border: none;
}
.lesson-codeblock-pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--text-primary);
}

/* --- Callouts rediseñados --- */
.lesson-callout {
  border-left: 3px solid var(--accent-sage);
  background-color: var(--accent-sage-dim);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
}
.lesson-callout-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  margin: 0 0 0.45rem;
  color: var(--accent-sage-bright);
}
.lesson-callout p:last-child { margin-bottom: 0; }

.lesson-callout--info   { border-left-color: var(--info-blue);    background-color: var(--info-bg); }
.lesson-callout--info   .lesson-callout-title { color: #8EC0FF; }
.lesson-callout--warn   { border-left-color: var(--warn-amber);   background-color: var(--warn-bg); }
.lesson-callout--warn   .lesson-callout-title { color: #F0B952; }
.lesson-callout--danger { border-left-color: var(--danger-red);   background-color: var(--danger-bg); }
.lesson-callout--danger .lesson-callout-title { color: #F0883E; }
.lesson-callout--success{ border-left-color: var(--success-green);background-color: var(--success-bg); }
.lesson-callout--success.lesson-callout-title { color: #6EEA8A; }

/* --- Tablas dentro de lección --- */
.lesson-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-sm);
  margin: 1rem 0 1.25rem;
}
.lesson-table-wrap:focus-visible {
  outline: 2px solid var(--accent-sage);
  outline-offset: 3px;
}
.lesson-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
  margin: 0;
}
.lesson-table th {
  background-color: var(--bg-elevated);
  color: var(--text-heading);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.7rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-default);
}
.lesson-table td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: top;
  line-height: 1.55;
}
.lesson-table tr:last-child td { border-bottom: none; }
.lesson-table tr:hover td { background-color: rgba(255,255,255,0.02); }
.lesson-strong { color: var(--accent-sage); }

/* Tabla clave-valor compacta (dentro de pasos) */
.lesson-table--kv td:first-child { width: 40%; font-family: var(--font-mono); font-size: 0.9em; }
.lesson-table-wrap--small { margin-top: 0.75rem; }

/* --- Challenge (desafío del módulo) --- */
.lesson-challenge {
  border: 2px solid var(--accent-sage);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  margin: 2rem 0;
  background-color: rgba(111, 187, 174, 0.04);
}
.lesson-challenge-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-sage);
  margin: 0 0 0.6rem;
}
.lesson-challenge h2 {
  font-size: 1.35rem;
  color: var(--accent-sage-bright);
  margin: 0 0 0.75rem;
}
.lesson-challenge-steps { padding-left: 1.2rem; margin: 0.75rem 0; }
.lesson-challenge-steps li { margin-bottom: 0.5rem; line-height: 1.65; }
.lesson-challenge-bonus {
  padding: 0.85rem 1.1rem;
  background-color: var(--accent-sage-dim);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-sage);
  margin-top: 1.1rem;
  font-size: 0.93rem;
}

/* --- Footer de lección --- */
.lesson-footer {
  max-width: 820px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3.5rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.lesson-back {
  font-size: 0.88rem;
  color: var(--accent-sage);
  border-bottom: none;
  font-weight: 500;
}
.lesson-back:hover { color: var(--accent-sage-bright); }
.lesson-footer p { margin: 0; font-size: 0.83rem; color: var(--text-secondary); }

/* --- lesson-pager: navegación Anterior / Siguiente al final de cada módulo --- */
.lesson-pager {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  gap: 1rem;
  align-items: stretch;
}
.lesson-pager-link {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.1rem 1.25rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  border-bottom: 1px solid var(--border-subtle); /* cancela underline global de <a> */
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
  min-width: 0; /* evita desborde de texto largo en flex */
}
.lesson-pager-link:hover {
  border-color: var(--border-focus);
  border-bottom-color: var(--border-focus);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.lesson-pager-dir {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-sage);
}
.lesson-pager-name {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-heading);
  line-height: 1.4;
}
.lesson-pager--next { text-align: right; }
.lesson-pager--next .lesson-pager-dir { color: var(--accent-sage-bright); }
/* --prev usa alineación izquierda por defecto; la clase existe para hooks futuros */
.lesson-pager--prev { text-align: left; }

/* Cuando solo hay un destino (módulo 01 sin anterior / 17 sin siguiente) */
.lesson-pager--ghost {
  visibility: hidden;
  pointer-events: none;
}

@media (max-width: 640px) {
  .lesson-pager { flex-direction: column; }
  .lesson-pager--next { text-align: left; }
  .lesson-pager--ghost { display: none; }
}

@media (min-width: 1200px) {
  .lesson-pager { max-width: 900px; }
}

/* --- Helper: encabezado de subsección dentro de lesson-card --- */
.lesson-section-lead {
  color: var(--accent-sage);
  font-weight: 600;
  margin: 0 0 0.5rem;
}

/* mxj lesson-col-*: columnas angostas en tablas de referencia */
.lesson-col-narrow  { width: 90px;  white-space: nowrap; }
.lesson-col-medium  { width: 140px; white-space: nowrap; }

/* lesson-footer--nav: variant con 3 enlaces (anterior / dashboard / siguiente) */
.lesson-footer--nav { justify-content: space-between; }

/* --- Responsive lección --- */
@media (max-width: 768px) {
  .lesson-body { font-size: 1rem; }
  .lesson-header { padding: 1.75rem 1.25rem 1.5rem; }
  .lesson-container { padding: 1.25rem 1.25rem 3rem; }
  .lesson-card { padding: 1.35rem 1.4rem; }
  .lesson-parts-grid { grid-template-columns: 1fr; }
  .lesson-footer { padding: 1.25rem; }
  .lesson-kv { min-width: 90px; }
}

@media (min-width: 1200px) {
  .lesson-header,
  .lesson-container,
  .lesson-breadcrumbs,
  .lesson-footer { max-width: 900px; }
}