html {
  font-size: 62.5%;
  scroll-behavior: smooth;
  /* 1 rem = 10px */
}

body {
  display: grid;
  grid-template-areas:
    "header header header header"
    "hero hero hero hero"
    "about about about about"
    "services services services services"
    "projects projects projects projects"
    "footer footer footer footer";
  grid-template-columns: repeat(4, 1fr);
  font-size: 1.6rem;
  font-family: "Roboto", sans-serif;
  font-weight: 400;
}

/* HEADER */

.header {
  grid-area: header;
}

.header .header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 4rem;
  min-height: 7.5rem;
}

.header .logo {
  font-weight: 700;
  font-size: 2.5rem;
  transition: 0.3s ease-in-out;
}

.header .logo:hover {
  color: coral;
}

/* HEADER */

/* HERO */

.hero {
  grid-area: hero;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 89vh;
  background: url(../images/airplane.jpg) center center no-repeat;
  background-size: cover;
}

.hero h2 {
  font-weight: 500;
  text-transform: uppercase;
  font-size: 4rem;
  color: rgb(237, 249, 246);
}

.hero::after {
  content: url(../images/seta_preta.png);
  position: absolute;
  height: 35px;
  bottom: 40px;
  animation: downarrow 0.7s infinite alternate ease-in-out;
}

@-webkit-keyframes downarrow {
  0% {
    -webkit-transform: translateY(0);
  }

  100% {
    -webkit-transform: translateY(0.4em);
    opacity: 0.4;
  }
}

@media (max-width: 425px) {
  .hero {
    height: 60vh;
  }

  .hero h2 {
    font-size: 2.5rem;
  }
}

/* HERO */

/* ABOUT */

.about {
  display: grid;
  grid-area: about;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 2;
  background-color: #fff;
  max-width: var(--max-width-size);
  margin: 0 auto;
}

.about .item {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-content: center;
  padding: 20%;
}

.about .item h3 {
  font-weight: 600;
  font-size: 2.2rem;
}

.about .item p {
  margin: 25px 0;
  font-weight: 400;
  font-size: 1.8rem;
}

.about .item a {
  align-self: flex-start;
}

.about .item .btn-know-more {
  font-weight: 400;
}

.about .item .btn-know-more:hover {
  font-weight: 700;
}

.about .image {
  height: 100%;
  width: 100%;
  background-size: cover;
}

.about .image.right {
  background: url(../images/bridge.jpg) center center no-repeat;
}

.about .image.left {
  background: url(../images/sky.jpg) center center no-repeat;
}

@media (max-width: 768px) {
  .about .item {
    text-align: center;
  }

  .about .item a {
    align-self: center;
  }
}

@media (max-width: 425px) {
  .about {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(4, 1fr);
  }
}

/* ABOUT */

/* SERVICES*/

.services {
  grid-area: services;
  display: grid;
  grid-template-columns: 1fr 1fr;
  text-align: center;
}

.services .service {
  padding: 7rem 2rem;
}

.services .service img {
  width: 250px;
  margin-bottom: 30px;
}

.services .service p {
  font-size: 2rem;
  font-weight: 400;
  line-height: 25px;
  max-width: 400px;
  margin: 20px auto 0;
}

.services .service h3 {
  font-weight: 700;
  font-size: 2rem;
}

.services .service:nth-child(1) {
  background: rgb(135, 135, 135);
}

.services .service:nth-child(2) {
  background-color: rgb(112, 111, 111);
}

@media (max-width: 450px) {
  .services {
    grid-template-columns: 1fr;
  }
}

/* SERVICES*/

/* PROJECTS */

.projects {
  grid-area: projects;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.projects .project img {
  height: 100%;
  transition: 0.3s ease-in-out;
}

.projects .project a:hover img {
  opacity: 0.8;
}

@media (max-width: 768px) {
  .projects {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
  }
}

@media (max-width: 425px) {
  .projects {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(4, 1fr);
  }
}

/* PROJECTS */

.footer {
  grid-area: footer;
  display: flex;
  background-color: #fff;
  flex-direction: column;
  text-align: center;
  padding: 100px 0;
}

.footer h4 {
  font-weight: 700;
  font-size: 2.5rem;
  margin-bottom: 15px;
}

.footer nav {
  margin: 50px 0;
}

.footer nav ul {
  display: flex;
  justify-content: center;
  max-width: 320px;
  margin: 0 auto;
}

.footer nav ul li a {
  margin: 20px;
  font-weight: 500;
  font-synthesis: 2rem;
  transition: 0.3s ease-in-out;
}

.footer nav ul li a:hover {
  font-weight: 700;
  color: #fff;
}

.footer .social i {
  font-size: 2rem;
  transition: 0.3s;
}

.footer .social a {
  margin: 20px;
}

.footer .social a:hover {
  color: #fff;
}