<style type="text/css">

* {
margin: 0;
padding: 0;
}

/* render html5 elements as block */
principal, quadTopo, menuTopo, logo, quadCorpo, nav, quadMobil, quadBorda, section, footer {
display: block;
}

body, html{
line-height: 38px;
background-color: #4682b4;
font-family: Verdana, Arial, Helvetica, sans-serif;
}

/* Codigo responsivo */
* 
img, picture, video, embed {
 max-width:100% !important;
 height:auto !important;
}

/* header */
header {
 height: auto;
 margin: 0px;
}

/* Envolve tudo */
.principal{
  max-width: 900px;
  min-width: auto;
  background: #086a87;
  margin: 0 auto;
  padding: 5px;
  border-radius: 6px;
  clear: both;
}

/* Card container duplo */
.card-container-duplo {
  display: flex; 
  width: 98%;
  height: auto;
  background-color: #ddd;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  overflow: hidden; 
  padding: 5px;
  text-align: left;
  font-size: 25px;
  color: #555;
}
.card-section-duplo {
  flex: 1; 
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: background-color 0.3s ease;
}
.left-section-duplo {
  background-color: #e3f2fd; 
  border-right: 1px solid #ddd;
}
.right-section-duplo {
  background-color: #fff; 
}
.card-section-duplo h2 {
  margin-top: 0;
  color: #333;
}
.card-section-duplo p {
  color: #666;
}

/* Responsividade: para telas menores, o card fica vertical */
@media (max-width: 768px) {
  .card-container-duplo {
    flex-direction: column;
    height: auto;
  }
  .left-section-duplo {
    border-right: none;
    border-bottom: 2px solid #ddd;
  }
}

/* Efeito Hover único e corrigido (Escolha a cor de preferência, mantive a do "Instagram" aqui) */
.btn-ebook:hover {
  color: yellow; 
  transform: scale(1.05); 
}

</style>

