/* ============================================
   TRABAJO CIENTÍFICO — Portal Styles
   Superficies planas, tipografía fuerte y rojo
   oscuro de marca. Sin glassmorphism ni orbes:
   el contraste lo aporta el borde, no el blur.
   ============================================ */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  color-scheme: dark;

  /* --- Neutros ---
     Casi negros con una pizca de azul para que el
     rojo de marca no vire a marrón por contraste. */
  --bg-deep: #0c0d10;
  --bg-surface: #14161b;
  --bg-surface-2: #1b1e25;
  --bg-hover: #232730;
  --border: #262a33;
  --border-hover: #3b414d;

  /* Contraste medido sobre --bg-surface:
     primary 15.1:1 · secondary 7.3:1 · muted 4.6:1 (mínimo AA = 4.5:1) */
  --text-primary: #f2f3f5;
  --text-secondary: #a9afbc;
  --text-muted: #7d8492;

  /* --- Rojo oscuro de marca ---
     brand-600 es el color de acción (blanco encima = 6.0:1).
     brand-300 es el único que se usa como texto sobre fondo
     oscuro: el 600 sobre el fondo profundo solo da 2.6:1. */
  --brand-900: #40080e;
  --brand-800: #6b0f18;
  --brand-700: #8c1420;
  --brand-600: #a81b29;
  --brand-500: #c42232;
  --brand-400: #e04352;
  --brand-300: #ff6b78;
  --brand: var(--brand-600);
  --brand-text: var(--brand-300);
  --brand-tint: rgba(196, 34, 50, 0.12);
  --brand-tint-strong: rgba(196, 34, 50, 0.22);
  --brand-ring: rgba(196, 34, 50, 0.45);

  --success: #2fb85f;
  --warning: #d98a2b;
  --error: #e0475a;
  --live: #ff4757;

  --content-max: 1240px;
  --nav-h: 68px;

  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-brand: 0 8px 24px rgba(168, 27, 41, 0.35);

  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Tema claro
   El rojo se oscurece al 700: el 600 sobre blanco
   da 6.4:1 como texto pero pierde peso de marca.
   ============================================ */
:root[data-theme="light"] {
  color-scheme: light;

  --bg-deep: #f4f5f7;
  --bg-surface: #ffffff;
  --bg-surface-2: #f0f1f4;
  --bg-hover: #e7e9ee;
  --border: #e1e3e8;
  --border-hover: #c2c6cf;

  /* Contraste medido sobre blanco:
     primary 16.9:1 · secondary 8.1:1 · muted 4.8:1 · brand-text 8.4:1 */
  --text-primary: #12141a;
  --text-secondary: #4c5462;
  --text-muted: #6b7280;

  --brand-text: #8c1420;
  --brand-tint: rgba(140, 20, 32, 0.08);
  --brand-tint-strong: rgba(140, 20, 32, 0.16);
  --brand-ring: rgba(140, 20, 32, 0.35);

  --success: #15803d;
  --warning: #b45309;
  --error: #b91c1c;

  --shadow-sm: 0 1px 2px rgba(18, 20, 26, 0.06);
  --shadow-md: 0 8px 24px rgba(18, 20, 26, 0.10);
  --shadow-brand: 0 8px 24px rgba(140, 20, 32, 0.22);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Los titulares llevan tracking negativo: es lo que
   da la sensación compacta y editorial de la marca. */
h1, h2, h3 {
  letter-spacing: -0.03em;
  line-height: 1.15;
  font-weight: 800;
}

:focus-visible {
  outline: 2px solid var(--brand-400);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}

/* --- Fondo ---
   Un único lavado rojo detrás del hero, estático.
   Sustituye a los orbes animados y al canvas. */
.portal-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(900px 520px at 15% -5%, rgba(168, 27, 41, 0.22), transparent 70%),
    radial-gradient(700px 420px at 95% 0%, rgba(107, 15, 24, 0.16), transparent 70%);
}

:root[data-theme="light"] .portal-bg {
  background:
    radial-gradient(900px 520px at 15% -5%, rgba(168, 27, 41, 0.10), transparent 70%),
    radial-gradient(700px 420px at 95% 0%, rgba(140, 20, 32, 0.07), transparent 70%);
}

.portal-bg .orb { display: none; }

/* ============================================
   Navbar
   ============================================ */
.portal-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  min-height: var(--nav-h);
  padding: 10px clamp(16px, 4vw, 40px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--bg-deep);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}

.portal-nav.scrolled {
  box-shadow: 0 1px 0 var(--border), 0 6px 24px rgba(0, 0, 0, 0.35);
}

:root[data-theme="light"] .portal-nav.scrolled {
  box-shadow: 0 1px 0 var(--border), 0 6px 20px rgba(18, 20, 26, 0.08);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

/* Es un logotipo apaisado: se le respeta la proporción
   en vez de encajarlo en un cuadrado. */
.nav-logo {
  height: 34px;
  width: auto;
  display: block;
}

.nav-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  white-space: nowrap;
}

.nav-title span {
  color: var(--brand-text);
}

.nav-brand-tag {
  padding: 3px 8px;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brand-text);
  background: var(--brand-tint);
  border: 1px solid var(--brand-ring);
  border-radius: var(--radius-xs);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  padding: 8px 12px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-xs);
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav-cta {
  padding: 10px 18px;
  background: var(--brand-600);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.nav-cta:hover {
  background: var(--brand-500);
  box-shadow: var(--shadow-brand);
}

/* --- Redes en la barra --- */
.nav-socials {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-social {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.nav-social svg { transition: transform var(--transition); }
.nav-social:hover svg { transform: scale(1.08); }

.nav-social--yt:hover {
  color: #ff4d4d;
  border-color: rgba(255, 0, 0, 0.45);
  background: rgba(255, 0, 0, 0.10);
}

.nav-social--wa:hover {
  color: #25d366;
  border-color: rgba(37, 211, 102, 0.45);
  background: rgba(37, 211, 102, 0.10);
}

.nav-socials--mobile { display: none; }

/* --- Controles de lectura --- */
.prefs-controls {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.prefs-btn {
  min-width: 40px;
  min-height: 40px;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: inherit;
  font-weight: 800;
  cursor: pointer;
  transition: var(--transition);
}

.prefs-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-hover);
}

.prefs-btn--theme { font-size: 1rem; }

/* ============================================
   Hero
   Alineado a la izquierda dentro del contenedor:
   la lectura arranca en el mismo eje que el resto
   de secciones, sin centrados sueltos.
   ============================================ */
.hero {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: calc(var(--nav-h) + 72px) clamp(16px, 4vw, 40px) 64px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  margin-bottom: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand-400);
  box-shadow: 0 0 0 0 var(--brand-ring);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 var(--brand-ring); }
  70% { box-shadow: 0 0 0 8px rgba(196, 34, 50, 0); }
  100% { box-shadow: 0 0 0 0 rgba(196, 34, 50, 0); }
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: 20px;
  max-width: 16ch;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  max-width: 56ch;
  margin-bottom: 36px;
}

/* Sustituye al degradado: color plano de marca. */
.gradient-text {
  color: var(--brand-text);
}

/* --- CTAs del hero --- */
.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-primary);
  text-decoration: none;
  transition: var(--transition);
}

.hero-cta:hover {
  border-color: var(--border-hover);
  background: var(--bg-hover);
  transform: translateY(-2px);
}

.hero-cta-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  border-radius: var(--radius-xs);
  background: var(--bg-surface-2);
  font-size: 1.1rem;
}

.hero-cta-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.hero-cta-text strong {
  font-size: 0.92rem;
  font-weight: 700;
}

.hero-cta-text small {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.hero-cta--primary {
  background: var(--brand-600);
  border-color: var(--brand-600);
  color: #fff;
}

.hero-cta--primary .hero-cta-icon { background: rgba(255, 255, 255, 0.16); }
.hero-cta--primary .hero-cta-text small { color: rgba(255, 255, 255, 0.75); }

.hero-cta--primary:hover {
  background: var(--brand-500);
  border-color: var(--brand-500);
  box-shadow: var(--shadow-brand);
}

.hero-cta--primary .hero-cta-icon .live-dot { background: #fff; }
.hero-cta--free:hover { border-color: var(--brand-ring); }
.hero-cta--yt:hover { border-color: rgba(255, 0, 0, 0.45); }
.hero-cta--yt .hero-cta-icon { color: #ff4d4d; }
.hero-cta--wa:hover { border-color: rgba(37, 211, 102, 0.45); }
.hero-cta--wa .hero-cta-icon { color: #25d366; }
.hero-cta--site:hover { border-color: var(--brand-ring); }

/* ============================================
   Próximos inicios
   Los dos cursos en vivo van antes que nada y a
   lo ancho: son lo único con fecha de cierre.
   ============================================ */
.upcoming-section {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 8px clamp(16px, 4vw, 40px) 56px;
}

.upcoming-header {
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.upcoming-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--brand-600);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.upcoming-eyebrow .live-dot { background: #fff; }

.upcoming-header h2 {
  font-size: clamp(1.8rem, 3.6vw, 2.5rem);
  margin-bottom: 10px;
}

.upcoming-list {
  display: grid;
  gap: 16px;
}

.upcoming-card {
  position: relative;
  display: grid;
  grid-template-columns: 300px 1fr minmax(200px, auto);
  gap: 24px;
  align-items: center;
  padding: 20px;
  overflow: hidden;
  background: var(--bg-surface);
  border: 1px solid var(--brand-ring);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

/* --- Imagen del curso --- */
.upcoming-media {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--bg-surface-2);
}

.upcoming-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.upcoming-card:hover .upcoming-media img { transform: scale(1.05); }

.upcoming-card:hover {
  transform: translateY(-3px);
  border-color: var(--brand-500);
  box-shadow: 0 12px 32px rgba(168, 27, 41, 0.25);
}

/* --- Bloque de fecha, superpuesto sobre la imagen ---
   Funciona como el taco de un calendario: es lo que
   ancla la lectura antes que el propio título. */
.upcoming-date {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  background: var(--brand-600);
  border: 1px solid var(--brand-500);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
}

.upcoming-date-month {
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.9);
}

.upcoming-date-day {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.05em;
  color: #fff;
}

.upcoming-date-year {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.75);
}

/* --- Contenido --- */
.upcoming-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  background: var(--brand-tint);
  border: 1px solid var(--brand-ring);
  color: var(--brand-text);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.upcoming-title {
  font-size: 1.28rem;
  line-height: 1.25;
  margin-bottom: 8px;
  color: var(--text-primary);
  transition: color var(--transition);
}

.upcoming-card:hover .upcoming-title { color: var(--brand-text); }

.upcoming-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  max-width: 62ch;
}

.upcoming-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* --- Cuenta regresiva y acción --- */
.upcoming-action {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 10px;
}

.upcoming-countdown {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 0.82rem;
  font-weight: 800;
  background: var(--bg-surface-2);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

/* A una semana o menos el contador deja de ser un dato
   y pasa a ser una alerta. */
.upcoming-countdown.is-urgent {
  background: var(--brand-tint);
  border-color: var(--brand-ring);
  color: var(--brand-text);
}

.upcoming-countdown.is-imminent {
  background: var(--brand-600);
  border-color: var(--brand-600);
  color: #fff;
  animation: countdownPulse 2.4s ease-in-out infinite;
}

@keyframes countdownPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(196, 34, 50, 0.5); }
  50% { box-shadow: 0 0 0 7px rgba(196, 34, 50, 0); }
}

/* Acción principal: la mayoría de quien llega aún no ha pagado,
   así que el botón de inscripción es el que manda en la columna. */
.upcoming-pay {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  text-align: center;
  background: var(--brand-600);
  border: 1px solid var(--brand-600);
  color: #fff;
  font-size: 0.88rem;
  font-weight: 700;
  text-decoration: none;
  transition: background var(--transition), box-shadow var(--transition);
}

.upcoming-pay:hover {
  background: var(--brand-500);
  box-shadow: var(--shadow-brand);
}

/* Acción secundaria: solo la usa quien ya compró y tiene clave */
.upcoming-cta {
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  text-align: center;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.upcoming-cta:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-hover);
}

/* Curso ya iniciado: se apaga la urgencia */
.upcoming-card.is-started .upcoming-date {
  background: var(--bg-surface-2);
  border-color: var(--border);
}
.upcoming-card.is-started .upcoming-date-day,
.upcoming-card.is-started .upcoming-date-month,
.upcoming-card.is-started .upcoming-date-year { color: var(--text-muted); }
.upcoming-card.is-started .upcoming-media img { filter: grayscale(0.6); }

@media (max-width: 1080px) {
  .upcoming-card {
    grid-template-columns: 240px 1fr;
    gap: 20px;
  }
  .upcoming-action {
    grid-column: 1 / -1;
    flex-direction: row;
    align-items: center;
  }
  .upcoming-countdown { flex: 0 0 auto; }
  .upcoming-pay,
  .upcoming-cta { flex: 1; }
}

@media (max-width: 680px) {
  .upcoming-card {
    grid-template-columns: 1fr;
    padding: 16px;
  }
  .upcoming-title { font-size: 1.1rem; }
  .upcoming-desc { margin-bottom: 10px; }
}

@media (max-width: 480px) {
  .upcoming-action { flex-direction: column; align-items: stretch; }
}

/* ============================================
   Secciones
   ============================================ */
.courses-section {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 40px clamp(16px, 4vw, 40px) 72px;
}

/* Encabezado con badge a la derecha */
.section-divider {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 20px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border);
}

.section-divider-text { max-width: 68ch; }

.section-eyebrow {
  display: block;
  margin-bottom: 8px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand-text);
}

.section-divider--pro .section-eyebrow { color: var(--text-muted); }

.section-divider h2,
.section-header h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  margin-bottom: 10px;
}

.section-subtitle,
.section-header p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Encabezado simple, centrado (instructor) */
.section-header {
  text-align: center;
  max-width: 60ch;
  margin: 0 auto 36px;
}

/* --- Badges de sección --- */
.badge-free,
.badge-pro,

.badge-free {
  color: var(--success);
  border-color: rgba(47, 184, 95, 0.4);
  background: rgba(47, 184, 95, 0.10);
}

.badge-live {
  color: #fff;
  background: var(--brand-600);
  border-color: var(--brand-600);
}

.live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  animation: pulse-dot 1.6s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* ============================================
   Rejilla y tarjetas de curso
   ============================================ */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(272px, 1fr));
  gap: 20px;
}

.course-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.course-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

/* --- Miniatura ---
   Duotono oscuro por curso: aporta variedad sin
   competir con el rojo, que queda para las acciones. */
.card-thumbnail {
  position: relative;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--card-tint-a, #23272f), var(--card-tint-b, #171a20));
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

/* Trama fina de rejilla, apenas perceptible */
.card-thumbnail::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 28px 28px;
}

/* Filigrana de marca, igual que en la banda de inicios:
   un emoji suelto y gigante era lo que restaba oficio. */
.card-thumbnail::after {
  content: '';
  position: absolute;
  right: 12px;
  bottom: 10px;
  width: 78px;
  height: 39px;
  background: url('../imagenes/logo-mark.png') no-repeat right bottom / contain;
  opacity: 0.10;
  pointer-events: none;
}

/* Si la tarjeta trae imagen del curso, esta manda:
   sustituye al icono, a la trama y a la filigrana. */
.card-thumbnail img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.course-card:hover .card-thumbnail img { transform: scale(1.05); }

.card-thumbnail:has(img)::before,
.card-thumbnail:has(img)::after,
.card-thumbnail:has(img) .card-icon { display: none; }

/* El icono va contenido en una placa, no flotando */
.card-thumbnail .card-icon {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 62px;
  height: 62px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 1.8rem;
  line-height: 1;
  transition: transform var(--transition);
}

.course-card:hover .card-icon { transform: scale(1.06); }

/* Franja superior de acento */
.card-gradient-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--brand-600);
}

.card-upcoming-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: var(--radius-xs);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #fff;
  background: var(--brand-600);
}

.card-upcoming-badge {
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid var(--border-hover);
  color: var(--text-secondary);
}

/* --- Cuerpo --- */
.card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 16px 18px 18px;
}

.card-category {
  display: block;
  margin-bottom: 8px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.course-card.live .card-category { color: var(--brand-text); }
.course-card.upcoming .card-category { color: var(--warning); }

.card-title {
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 8px;
  color: var(--text-primary);
  transition: color var(--transition);
}

.course-card:hover .card-title { color: var(--brand-text); }

.card-description {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 14px;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.card-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-muted);
}

.card-meta-cta {
  color: var(--brand-text) !important;
  margin-left: auto;
}

/* --- Variantes de color por curso --- */
.course-card[data-theme="cyan"]   { --card-tint-a: #123540; --card-tint-b: #0d1c22; }
.course-card[data-theme="purple"] { --card-tint-a: #2b2040; --card-tint-b: #171224; }
.course-card[data-theme="green"]  { --card-tint-a: #163523; --card-tint-b: #0d1c14; }
.course-card[data-theme="orange"] { --card-tint-a: #3d2614; --card-tint-b: #21140b; }
.course-card[data-theme="pink"]   { --card-tint-a: #3b1729; --card-tint-b: #200c17; }
.course-card[data-theme="blue"]   { --card-tint-a: #14203d; --card-tint-b: #0b1121; }
.course-card[data-theme="yellow"] { --card-tint-a: #372c11; --card-tint-b: #1e180a; }
.course-card[data-theme="red"]    { --card-tint-a: #3d151b; --card-tint-b: #210b0e; }

/* ============================================
   Footer
   ============================================ */
.portal-footer {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 40px clamp(16px, 4vw, 40px) 48px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-cta-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
}

.footer-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  transition: var(--transition);
}

.footer-cta:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-hover);
}

.footer-cta--yt:hover { color: #ff4d4d; border-color: rgba(255, 0, 0, 0.45); }
.footer-cta--wa:hover { color: #25d366; border-color: rgba(37, 211, 102, 0.45); }
.footer-cta--site:hover { color: var(--brand-text); border-color: var(--brand-ring); }
.footer-cta--site svg { transition: transform var(--transition); }
.footer-cta--site:hover svg { transform: translateX(-3px); }

.footer-copy {
  color: var(--text-muted);
  font-size: 0.82rem;
  margin: 0;
}

/* ============================================
   Animaciones de scroll
   Desplazamiento corto: la página no debe "saltar".
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

.reveal-delay-1 { transition-delay: 0.06s; }
.reveal-delay-2 { transition-delay: 0.12s; }
.reveal-delay-3 { transition-delay: 0.18s; }
.reveal-delay-4 { transition-delay: 0.24s; }
.reveal-delay-5 { transition-delay: 0.30s; }
.reveal-delay-6 { transition-delay: 0.36s; }
.reveal-delay-7 { transition-delay: 0.42s; }
.reveal-delay-8 { transition-delay: 0.48s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .pulse-dot, .live-dot { animation: none; }
  html { scroll-behavior: auto; }
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .nav-links .nav-link { padding: 8px 10px; }
  .nav-brand-tag { display: none; }
}

@media (max-width: 900px) {
  /* Se ocultan los contenedores, no solo sus enlaces:
     un flex vacío seguiría ocupando el hueco del gap. */
  .nav-links .nav-socials,
  .nav-links .prefs-controls { display: none; }
  .nav-socials--mobile {
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }
}

@media (max-width: 768px) {
  :root { --nav-h: 60px; }

  .portal-nav {
    flex-wrap: wrap;
    padding: 10px 16px;
    gap: 10px;
  }
  .nav-title { font-size: 0.95rem; }
  .nav-links { gap: 2px; }
  .nav-links .nav-link { font-size: 0.82rem; padding: 7px 8px; }
  .nav-cta { padding: 9px 14px; font-size: 0.82rem; }
  .nav-socials--mobile .nav-social { width: 32px; height: 32px; }

  .hero { padding-top: calc(var(--nav-h) + 48px); padding-bottom: 48px; }
  .hero h1 { max-width: none; }
  .hero-cta { width: 100%; }

  .section-divider { align-items: flex-start; }
  .courses-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
  .courses-grid--featured { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .courses-grid { grid-template-columns: 1fr; }
  .hero-stat { padding: 18px 16px; }
}