@media screen and (min-width: 320px) and (min-device-width : 320px) {
  html {
    color: #FDFDFD;
    font-family: OpenSans, Arial, Helvetica, sans-serif;
    font-size: calc(0.75em + 1vw);
    scroll-behavior: smooth;
  }

  body {
    width: 100%;
    margin: 0 auto;
    background-color: #000;
  }

  header {
    background-color: #000;
    position: sticky;
    z-index: 1;
    top: 0;
  }

  section:nth-of-type(odd) {
    background-color: #333;
  }

  section:nth-of-type(even) {
    background-color: #444;
  }

  section > h1 {
    padding-top: 30px;
  }

  .header-image {
    width: 100%;
    height: 100%;
    position: relative;
  }

  .header-image > img{
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    min-height: 480px;
  }

  .fab {
    width: 80px;
    height: 80px;
    background-color: #222;
    border-radius: 25%;
    border: 5px solid #DDD;
    font-size: 65px;
    text-align: center;
    position: fixed;
    transition: right 0.5s;
    right: -200px;
    bottom: 20px;
  }

  .fab > a {
    display: block;
    width: 100%;
    height: 100%;
    color: #66ccff;
    text-decoration: none;
  }

  .sobre {
    padding: initial;
  }

  .section-anchor {
    display: block;
    height: 65px;
    margin-top: -65px;
    visibility: hidden;
  }

  .menu-principal {
    background-color: #000;
  }

  .menu-principal a {
    display: block;
    color: #FDFDFD;
    text-decoration: none;
  }

  .menu-principal > a:first-child {
    padding: 5px 25px;
  }

  .menu-principal ul {
    display: flex;
    top: -270px;
    width: 100%;
    opacity: 0.85;
    z-index: -1;
    position: absolute;
    flex-direction: column;
    transition: top 0.5s;
    background-color: #000;
  }

  .menu-principal ul li {
    padding: 0.25rem 1.25rem;
  }

  .mobile-icon {
    display: flex;
    position: absolute;
    top: 10px;
    right: 10px;
  }

  .mobile-icon img {
    width: 50px;
    height: 50px;
  }

  .secao-titulo {
    text-align: center;
    margin-bottom: 10px;
  }

  .item-de-artigo img {
    display: block;
    width: 100%;
    margin: 5px auto;
  }

  .item-de-artigo > a {
    display: flex;
  }

  .item-de-artigo p > a{
    color: #66ccff;
    text-decoration: none;
  }

  .item-de-artigo p {
    padding: 10px 5px 50px;
  }

  h1 {
    font-size: 32px;
    line-height: 60px;
  }

  p {
    padding: 5px;
    text-align: justify;
    line-height: 24px;
    hyphens: auto;
  }

  .grupo-banner {
    display: flex;
    height: 250px;
    flex-direction: column;
    align-items: center;
    justify-content: space-evenly;
  }

  .grupo-banner a {
    display: block;
  }
  .grupo-banner img {
    display: block;
    width: 100%;
  }

  em {
    font-style: italic;
  }
}

@media screen and (min-width: 1000px) {
  html {
    font-size: 20px;
  }
}

@media screen and (min-width: 768px) and (min-device-width : 768px)
{
  html {
    font-size: calc(0.6em + 1vw);
  }

  .menu-principal ul
  {
    display: flex;
    width: 100%;
    z-index: -1;
    opacity: 0.85;
    position: absolute;
    flex-direction: column;
    transition: top 0.5s;
    background-color: #000;
  }

  .sobre {
    padding: initial;
  }

  .header-image > img{
    min-height: 768;
  }

  .fab {
    width: 60px;
    height: 60px;
    font-size: 45px;
  }

  .grupo-artigos {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
  
  .item-de-artigo {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    margin: 40px 10px;
  }

  .item-de-artigo img {
    border: 1px solid #AAA;
  }

  .item-de-artigo:last-of-type {
    margin: 40px 10px 0;
  }

  p {
    padding: 5px;
    text-align: justify;
    line-height: 30px;
    hyphens: auto;
  }

  footer p {
    text-align: center;
    margin: 30px 0 30px;
  }
}

@media screen and (min-width: 1200px) and (min-device-width : 1200px)
{
  html {
    font-size: calc(0.4em + 1vw);
  }

  article {
    padding: 20px 50px;
  }

  article:nth-of-type(odd) {
    flex-direction: row;
  }
  
  article:nth-of-type(even) {
    flex-direction: row-reverse;
  }
  
  .menu-principal {
    display: flex;
    width: 100%;
    height: 65px;
    margin: 0 auto;
    font-size: 8px;
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
  }

  .menu-principal ul {
    top: 0;
    display: flex;
    flex-direction: row;
    position: static;
    z-index: 0;
    width: auto;
  }

  .menu-principal > a:first-child {
    display: none;
  }

  .mobile-icon {
    top: -100px;
  }

  .sobre {
    padding: 0 calc(30% - 15rem);
  }

  .header-image > img{
    min-height: auto;
  }

  .fab {
    width: 40px;
    height: 40px;
    font-size: 30px;
  }

  .grupo-artigos {
    display: block;
  }

  .item-de-artigo {
    display: flex;
    flex-direction: row;
    align-items: center;
  }

  .item-de-artigo a {
    flex: 0 0 50%;
  }

  .item-de-artigo img {
    margin: 5px;
    border: 2px solid #AAA;
  }

  .item-de-artigo p {
		margin: 0 20px;
		align-self: center;
  }

  h1 {
    font-size: calc(2em + 1vw);
    line-height: 40px;
  }
  
  p {
    padding: 5px;
    text-align: justify;
    line-height: 32px;
    hyphens: auto;
  }  

  footer p {
    text-align: center;
    margin: 30px 0 30px;
  }
}