@media (prefers-color-scheme: dark) {
  body {
    background: #1e1e1e;
    color: #f5f5f5;
  }

  .container {
    background: #2a2a2a;
    box-shadow: 0 2px 8px rgba(255,255,255,0.05);
  }

  input {
    background: #333;
    border: 1px solid #555;
    color: #f5f5f5;
  }

  button {
    background: #3399ff;
  }

  .menu {
    background: #1e1e1e;
    border-bottom: 2px solid #3399ff;
  }
}

:root {
  --celeste: #007ACC; /* estilo VS Code */
  --blanco: #ffffff;
  --gris-claro: #f4faff;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--blanco);
  color: #333;
}

.header {
  background: var(--celeste);
  text-align: center;
  padding: 15px;
}

.logo {
  font-family: "Brush Script MT", cursive;
  font-size: 2.5rem;
  color: var(--blanco);
  margin: 0;
}

.logo a {
  color: var(--blanco);
  text-decoration: none;
}

.logo a:hover {
  opacity: 0.8; /* un pequeño efecto al pasar el mouse */
}

.menu {
  background: var(--blanco);
  padding: 10px;
  text-align: center;
  border-bottom: 2px solid var(--celeste);
}

.menu span {
  font-weight: bold;
  color: #555;
  padding: 10px 20px;
  border-bottom: 3px solid transparent;
  cursor: pointer;
}

.menu .active {
  border-bottom: 3px solid var(--celeste);
  color: var(--celeste);
}

.container {
  max-width: 500px;
  margin: 40px auto;
  padding: 20px;
  background: var(--gris-claro);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

form {
  display: flex;
  gap: 8px;
}

input {
  flex: 1;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #ccc;
}

button {
  background: var(--celeste);
  border: none;
  border-radius: 8px;
  color: var(--blanco);
  font-size: 1.2rem;
  padding: 0 15px;
  cursor: pointer;
}

.footer {
  background: var(--celeste);
  text-align: center;
  padding: 15px;
  margin-top: 40px;
}

/* --- Sticky footer con Flexbox --- */
html, body {
  height: 100%;
  margin: 0;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1; /* ocupa el espacio disponible y empuja el footer hacia abajo */
}

/* --- Diseño Responsive --- */

/* Celulares (pantallas pequeñas) */
@media (max-width: 600px) {
  .logo {
    font-size: 2rem;
  }

  .container {
    margin: 20px;
    padding: 15px;
  }

  form {
    flex-direction: column;
  }

  input, button {
    width: 100%;
    font-size: 1rem;
  }

  button {
    padding: 10px;
    margin-top: 10px;
  }

  h2 {
    font-size: 1.3rem;
    text-align: center;
  }

  p {
    font-size: 0.95rem;
    text-align: center;
  }
}

/* Tablets (pantallas medianas) */
@media (min-width: 601px) and (max-width: 900px) {
  .logo {
    font-size: 2.2rem;
  }

  .container {
    max-width: 600px;
    margin: 30px auto;
  }

  input {
    font-size: 1rem;
  }

  button {
    font-size: 1rem;
  }
}

/* Escritorios grandes */
@media (min-width: 901px) {
  .container {
    max-width: 700px;
  }
}
/* ==== ANIMACIONES Y EFECTOS ==== */

:root {
  --transicion: 0.3s ease;
}

.column {
  flex: 1 1 280px;
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  transition: transform var(--transicion), box-shadow var(--transicion);
}

.column:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 18px rgba(0,0,0,0.1);
}

.whatsapp-btn {
  display: inline-block;
  background-color: #25D366;
  color: white;
  font-weight: bold;
  padding: 12px 20px;
  border-radius: 8px;
  text-decoration: none;
  margin: 20px auto;
  text-align: center;
  transition: background-color var(--transicion), transform var(--transicion);
}

.whatsapp-btn:hover {
  background-color: #1ebe5b;
  transform: scale(1.05);
}

details {
  overflow: hidden;
  transition: background-color var(--transicion), box-shadow var(--transicion);
}

details[open] {
  background-color: #f9f9f9;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

details summary {
  cursor: pointer;
  font-weight: 600;
  transition: color var(--transicion);
}

details summary:hover {
  color: var(--celeste);
}

.info, .soporte {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1s ease forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Pequeño brillo al pasar sobre los títulos */
.info h2:hover, .soporte h2:hover {
  text-shadow: 0 0 8px rgba(0, 170, 255, 0.3);
  transition: text-shadow 0.4s ease;
}
/* ==== Sección informativa BYV ajustada ==== */
.info {
  max-width: 900px; /* más ancho */
  margin: 30px auto 15px auto;
  text-align: center;
  background: #f9fcff;
  padding: 20px 40px; /* menos alto, más largo */
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  line-height: 1.5;
}

.info h2 {
  color: var(--celeste);
  font-size: 1.4rem;
  margin-bottom: 10px;
}

.info p {
  color: #333;
  font-size: 0.95rem;
  margin-bottom: 8px;
}

/* Contenedor general más compacto */
.container {
  max-width: 700px;
  margin: 15px auto 10px auto;
  padding: 20px;
  background: var(--gris-claro);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}