:root {
  --bg-color: #080808;
  --second-bg-color: #131313;
  --text-color: white;
  --main-color: #00ffee;
}
body {
  background: var(--second-bg-color);
  color: var(--text-color);
}
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1rem 10% 4rem;
  padding-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 5;
  background: var(--bg-color);
}

.navbar a {
  font-size: 1.5rem;
  color: var(--text-color);
  margin-left: 4rem;

  transition: 0.3s eas;

  opacity: 0;
  animation: slideBottom 1s ease forwards;
  animation-delay: 0.7s;
}
@keyframes slideBottom {
  0% {
    transform: translateY(-100px);
    opacity: 0;
  }
  100% {
    transform: translateY(0px);
    opacity: 1;
  }
}

.navbar a:hover,
.navbar a.active {
  color: var(--main-color);
}
/*section*/
section {
  padding-top: 3%;
  min-height: 100vh;
}
h2 {
  padding-top: 25px;
  padding-bottom: 0;
  font-size: 2rem;
  text-align: center;
  margin: 5rem 0;
}
.logos-img {
  display: flex;
  text-align: center;
  justify-content: space-around;
}
.logos-img img {
  width: 15vw;
  border-radius: 50%;
  box-shadow: 0 0 25px var(--main-color);

  justify-content: center;
  align-items: center;
}
.cards {
  position: relative;
  border-radius: 8px;

  display: flexbox;
  text-align: center;
}
.cards-img img {
  width: 30%;
  border-radius: 12px;
  display: flexbox;
  text-align: center;
  justify-content: space-around;
  margin-bottom: 25px;
  margin-left: 10px;
}
.product-ads {
  display: flexbox;
  text-align: center;
  position: relative;
  border-radius: 8px;
}
.product-elements img {
  width: 40%;
  border-radius: 5px;
  display: flexbox;
  text-align: left;
  justify-content: space-around;
  margin-bottom: 25px;
  margin-left: 10px;
}
.product-elements video {
  width: 30%;
  height: 20%;
  border-radius: 5px;
  display: flexbox;
  text-align: left;
  justify-content: space-around;
  margin-bottom: 25px;
  margin-left: 10px;
}
.books {
  display: flexbox;
  text-align: center;
}
.books img {
  width: 50%;
  border-radius: 8px;
  margin-bottom: 55px;
  box-shadow: 0 0 10px var(--main-color);
}
/*footer*/
.footer {
  position: relative;
  bottom: 0;
  width: 100%;
  padding-top: 10px;
  background-color: var(--bg-color);
}
.footer .social {
  text-align: center;
  padding-bottom: 8px;
  color: var(--main-color);
}
.footer .social a {
  font-size: 25px;
  color: var(--main-color);
  border: 2px solid var(--main-color);
  width: 42px;
  height: 42px;
  line-height: 42px;
  display: inline-block;
  text-align: center;
  border-radius: 50%;
  margin: 0 10px;
  transition: 0.3s ease-in-out;
}
.footer .social a:hover {
  transform: scale(1.2) translateY(-10px);
  background-color: var(--main-color);
  color: black;
  box-shadow: 0 0 25px var(--main-color);
}
.footer .copyright {
  margin-top: 5px;
  text-align: center;
  font-size: 16px;
  color: white;
}
/*responsive*/
@media(max-width:1300px){
  .header{
    padding-left: 2rem;
  }
}
@media(max-width:1200px){
  .header{
    padding-left: 0rem;
  }
  .navbar a {
    margin-left: 2.5rem;
  }
  section {
    min-height: auto;
  }
  
  .logos-img img {
    margin: 2rem 0;
  }
  .cards-img img,
  .product-elements img {
    width: 45%;
    margin-bottom: 0.3rem;
    margin-left: 0.1rem;
  }
  .product-elements video {
    width: 42%;
    margin-bottom: 0.3rem;
    margin-left: 0.1rem;
  }
}
@media(max-width:1000px){
  .navbar a {
    font-size: 1rem;
    margin-left: 2.5rem;
  }
 
  h2 {
    font-size: 1.3rem;
    margin-top: 1rem;
    margin-bottom: 2rem;
  }
  
  .books img {
    width: 75%;
  }
  
}
@media(max-width:750px){
  .header {
    width: 105%;
    padding: 0;
  }
  
  .navbar a {
    font-size: 0.8rem;
    margin-left: 0.7rem;
  }
  .footer {
    padding: 10px 0;
  }
  .footer .social {
    padding-bottom: 5px;
  }
  .footer .social a {
    font-size: 18px;
    width: 25px;
    height: 25px;
    line-height: 25px;
  }
  .footer ul {
    font-size: 8px;
  }
  .footer ul li {
    display: inline-block;
    padding: 0 5px;
  }
  .footer .copyright {
    margin-top: 5px;
    font-size: 8px;
  }
}

/*scrollbar*/
::-webkit-scrollbar {
  width: 5px;
}
::-webkit-scrollbar-thumb {
  background-color: var(--main-color);
}
::-webkit-scrollbar-track {
  background-color: var(--bg-color);
  width: 50px;
}
@media (max-width: 500px) {
  .header {
    padding-left: 0.4rem;
  }
  .navbar a {
    font-size: 0.5rem;
    margin-left: 1.8rem;
  }
}

@media (max-width: 325px) {
  
  .navbar a {
    margin-left: 0.4rem;
  }
}