/* reset */
html {
  font-size: 62.5%;
}
body {
  font-size:1.4rem;
  margin:1rem;
}
ul, li {
  margin:0;
  padding:0;
}
a {
  text-decoration: none;
}
img, iframe {
  max-width: 100%;
}
section, header, article, aside, footer, nav a {
  box-sizing: border-box;
  display: block;
  padding: 0.5rem;
}
/* Balises natives */
main {
  max-width: 1200px;
  margin:0 auto;
  display: flex;
  flex-flow: row wrap;
  justify-content: space-between;
}
header {

flex: 1 1 auto;

background-color: gray;
}
nav {

flex: 1 1 100%;

background-color: greenyellow;

margin: 1rem 0;

padding: 0.5rem;
}
nav ul {
  font-size:0;
  text-align: center;
  display:flex;
  flex-flow:column wrap;
  justify-content:center;
}
nav li {
  display: inline-block;
  font-size:1.4rem;
  position: relative;
}
nav li:last-child::after {
  content: '';
}
section {
  background-color: #d8d8d8;
  width: auto;
  flex: 2 1 600px;
  margin: 0 0 1rem;
  padding: 0 1rem 1rem;
  box-sizing: border-box;
}
article {
  background-color: #8db1e2;
  margin: 1rem 0;
  min-height: 100px;
}
aside {
  background-color: #d99690;
  min-height: 100px;
}
main > aside {
  width: auto;
  margin: 0 0 1rem;
  flex: 1 1 300px;
}
footer {
  background-color: #d3d3ab;
  flex: 1 1 100%;
}
@media (min-width:480px) {
	nav ul {
	  flex-flow:row wrap;
	}
	nav li::after {
	  content: '|';
	  display: block;
	  position: absolute;
	  right: 0;
	  top:0.4rem;
	}
}
@media (min-width:930px) {
  section {
    margin-right: 1rem;
  }
  article:last-of-type {
      float: left;
      width: 70%;
      margin: 0;
  }
  aside {
    width: calc(30% - 1rem);
    float: left;
    margin: 0rem 0  0 1rem;
  }
}