* {
  margin: 0;
  padding: 0;
}

body {
  background-image: url(../img/b1.jpg);
  background-size: contain;
  font-family: Inter;
}

.main-container {
  display: grid;
  height: 100vh;
  grid-template-rows: 1fr 1fr 8fr 1fr;
  grid-template-areas:
    "nav"
    "header"
    "main"
    "footer";
}

aside {
  display: none;
}

nav {
  grid-area: nav;
  display: flex;
  justify-content: space-between;
  text-align: center;
  align-items: center;
  background-image: linear-gradient(to right, #243949 0%, #517fa4 100%);
}

nav img {
  width: 80px;
  margin: 5px 5px 1px 5px;
}

.index {
  font-size: 20px;
  color: #fdf0d3;
  padding-right: 10px;
}

.index a {
  color: #fdf0d3;
  text-decoration: none;
}

header {
  grid-area: header;
  justify-content: center;
  align-items: center;
  background-image: url(../img/header2.png);
  background-size: cover;
}

header h1 {
  color: rgb(77, 88, 117);
  font-size: 35px;
  font-weight: normal;
  justify-content: center;
  text-align: center;
  padding-top: 20px;
}

header p {
  color: rgb(77, 88, 117);
  font-size: 17px;
  font-weight: normal;
  text-align: center;
  padding: 20px 30px;
}

main {
  grid-area: main;
  display: grid;
}

.card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 97%;
  position: relative;
  padding: 5px;
}

.card-header {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

.card-header img {
  width: 100%;
  height: auto;
}

.card-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: #f9f3e3;
  width: 100%;
}

.card-body h3 {
  text-align: center;
  font-size: 20px;
  font-weight: normal;
  color: rgb(77, 88, 117);
  padding-top: 8px;
  padding-bottom: 5px;
}

.card-body button {
  background-color: rgb(77, 88, 117);
  color: #fdf0d3;
  width: 65px;
  padding: 2px;
  margin: 0px 10px 10px 10px;
}

.desplegable {
  position: relative;
  display: inline-block;
}

.contenido-desplegable {
  display: none;
  position: absolute;
  color: #2b506f;
  background-color: #f9f3e3;
  box-shadow: 0px 8px 16px 0px #243949;
  padding: 12px 16px;
  z-index: 1;
  width: 200px;
  top: 100%;
  left: 0;
}

.desplegable:hover .contenido-desplegable {
  display: block;
}

.boton-desplegable {
  color: #517fa4;
  font-size: 15px;
  padding: 0px 10px 15px 10px;
  border: none;
  cursor: default;
}

footer {
  grid-area: footer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 10px;
  background-image: linear-gradient(to right, #243949 0%, #517fa4 100%);
}

footer h4 {
  color: #fdf0d3;
  font-size: 15px;
  font-weight: lighter;
  padding: 5px;
}

footer p {
  color: #fdf0d3;
  font-size: 12px;
  font-weight: lighter;
  padding: 5px;
}

footer a {
  color: #fdf0d3;
  text-decoration: none;
}

footer h5 {
  color: #fdf0d3;
  font-size: 12px;
  font-weight: lighter;
  padding: 5px;
}

@media (min-width: 576px) {
  .main-container {
    grid-template-columns: 1fr 5fr;
    grid-template-rows: 1fr 1fr 9fr 1fr;
    grid-template-areas:
      "nav header"
      "aside section"
      "aside main"
      "footer footer";
  }

  nav {
    justify-content: center;
  }

  nav img {
    width: 15vh;
  }

  .index {
    display: none;
  }

  aside {
    grid-area: aside;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 40px;
    background-color: #fdf0d3;
    color: rgb(77, 88, 117);
  }

  aside a {
    color: rgb(77, 88, 117);
    text-decoration: none;
  }

  button {
    background-color: transparent;
    color: rgb(77, 88, 117);
    margin: 10px;
    padding: 6px;
    font-size: 22px;
    font-weight: lighter;
    border-color: transparent;
    transition: color 0.3s ease-in;
  }

  button:hover {
    color: rgb(173, 121, 57);
  }

  main {
    grid-area: main;
    display: grid;
    justify-content: center;
    align-items: center;
  }

  article {
    display: grid;
    justify-content: center;
    align-items: center;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 5px;
  }

  .card {
    padding: 5px;
  }

  .card-body {
    width: 95%;
  }

  .card img {
    width: 95%;
    height: auto;
  }
}