header{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-around;
    transition: 0.7s;
    padding: 30px 20px;
    z-index: 10;
}
header.abajo{
    background: rgba(9, 9, 9, 0.87);
    box-shadow: 0 0 10px rgb(0, 0, 0);
    
    padding: 15px 20px;
}
header .logo{
    position: relative;
    color: #fff;
    font-weight: bold;
    font-size: 2em;
    letter-spacing: 2px;
    transition: 1.5s;
    text-decoration: none;
}
nav{
    display: flex;
    justify-content: center;
    align-items: center;
}

header ul{
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

header ul li{
    list-style: none;
}

header ul li a{
    position: relative;
    font-family: helvetica;
    margin: 0 15px;
    text-decoration: none;
    color: #fff;
    letter-spacing: 2px;
    font-weight: 600;
    transition: 0.7s;
    position: relative;
}

header ul li a:hover{

    color: rgba(255, 255, 255, 0.598);
    -webkit-transform: scale(1.1);
  
}


.zona1{
    position: relative;
    width: 100%;
    height: 100vh;
    background-size: cover;
    background-position: center center;
}
header.abajo .logo,
header.abajo ul li a{
    color: rgb(255, 255, 255);
}








#hamburger-icon {
  margin: auto 0;
  display: none;
  cursor: pointer;
}

#hamburger-icon div {
  width: 35px;
  height: 3px;
  background-color: white;
  margin: 6px 0;
  transition: 0.4s;
}


.open .bar1 {
  -webkit-transform: rotate(-45deg) translate(-6px, 6px);
  transform: rotate(-45deg) translate(-6px, 6px);
}

.open .bar2 {
  opacity: 0;
}

.open .bar3 {
  -webkit-transform: rotate(45deg) translate(-6px, -8px);
  transform: rotate(45deg) translate(-6px, -8px);
}

.open .mobile-menu {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
}

.mobile-menu {
  display: none;
  position: absolute;
  top: 50px;
  left: 0;
  height: calc(100vh - 50px);
  width: 100%;
}

.mobile-menu li {
  margin-bottom: 10px;
}

@media only screen and (max-width: 600px) {
  header nav {
    display: none;
  }

  #hamburger-icon {
    display: block;
  }
}