/* =============================================================
   UI — Botones y elementos flotantes fijos
   Componentes que viven fuera del flujo del documento (position: fixed)
   mas el sistema de botones reutilizable.
   ============================================================= */


/* ---------- Botones ---------- */
/* =============================================
   BOTONES
============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-titulo);
  font-size: 0.9rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 0.85em 1.9em;
  border: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  white-space: nowrap;
}
.btn:hover  { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--amarillo);
  color: var(--azul-dark);
  box-shadow: 0 4px 20px rgba(240,165,0,0.28);
}
.btn-primary:hover {
  background: var(--amarillo-light);
  box-shadow: 0 6px 28px rgba(240,165,0,0.38);
}

.btn-outline {
  background: transparent;
  color: var(--blanco);
  border: 2px solid rgba(255,255,255,0.45);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.09);
  border-color: var(--blanco);
}

.btn-outline-dark {
  background: transparent;
  color: var(--azul);
  border: 2px solid rgba(26,45,184,0.3);
}
.btn-outline-dark:hover {
  background: var(--azul);
  color: var(--blanco);
}

/* Botón "fantasma" amarillo de las cards destacadas
   (reemplaza los onmouseover inline) */
.btn-ghost-amarillo {
  margin-top: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-titulo);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--amarillo-light);
  padding: 0.5em 1.2em;
  border: 1px solid rgba(240,165,0,0.3);
  border-radius: 999px;
  transition: background 0.2s, border-color 0.2s;
}
.btn-ghost-amarillo:hover {
  background: rgba(240,165,0,0.1);
  border-color: rgba(240,165,0,0.5);
}

/* ---------- Barra de progreso de lectura ---------- */
/* =============================================
   BARRA DE PROGRESO (transform = sin repaints)
============================================= */
#progress-bar {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--amarillo), var(--amarillo-light), var(--azul-mid));
  z-index: 9999;
  transform: scaleX(0);
  transform-origin: left center;
  border-radius: 0 2px 2px 0;
  pointer-events: none;
}

/* ---------- Luz ambiental del cursor ---------- */
/* =============================================
   CURSOR — LUZ AMBIENTAL (transform, no left/top)
============================================= */
#cursor-light {
  position: fixed;
  top: 0; left: 0;
  pointer-events: none;
  z-index: 9998;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  transform: translate3d(-50%, -50%, 0);
  will-change: transform;
  background: radial-gradient(circle, rgba(240,165,0,0.055) 0%, transparent 68%);
}
@media (hover: none) { #cursor-light { display: none; } }

/* ---------- Boton flotante de WhatsApp ---------- */
/* =============================================
   BOTÓN FLOTANTE WHATSAPP (CRO)
============================================= */
#wsp-float {
  position: fixed;
  bottom: 2.2rem;
  left: 2rem;
  z-index: 500;
  width: 54px; height: 54px;
  border-radius: 50%;
  background: var(--verde-wsp);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 24px rgba(37,211,102,0.45);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
#wsp-float:hover {
  transform: translateY(-3px) scale(1.06);
  box-shadow: 0 10px 32px rgba(37,211,102,0.55);
}
#wsp-float svg { width: 26px; height: 26px; fill: #fff; }
@media (max-width: 640px) {
  #wsp-float { left: 1rem; bottom: 1.4rem; width: 50px; height: 50px; }
  #back-top { display: none; }
}

/* ---------- Volver arriba ---------- */
/* =============================================
   BACK TO TOP
============================================= */
#back-top {
  position: fixed;
  bottom: 2.2rem;
  right: 2rem;
  z-index: 500;
  opacity: 0;
  transform: translateY(16px) scale(0.92);
  pointer-events: none;
  transition: opacity 0.35s ease, transform 0.35s ease;
}

#back-top.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

#back-top a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  background: var(--azul-dark);
  color: var(--blanco);
  border-radius: 14px;
  padding: 0.75rem 0.85rem;
  box-shadow: 0 6px 28px rgba(13,27,110,0.30);
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
  border: 1px solid rgba(255,255,255,0.1);
}

#back-top a:hover {
  background: var(--azul-mid);
  transform: translateY(-3px);
  box-shadow: 0 10px 36px rgba(13,27,110,0.40);
}

#back-top svg {
  width: 18px; height: 18px;
  stroke: var(--blanco);
  fill: none;
  stroke-width: 2.5;
}

#back-top span {
  font-family: var(--font-titulo);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.65);
}