/* Reset CSS */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f4f4f4;
  padding: 20px;
  margin: 0 auto;
  max-width: 1200px;
}

header {
  background: #333;
  color: #fff;
  padding: 10px 20px;
  text-align: center;
  border-bottom: #0779e4 3px solid;
}

header h1 {
  margin: 0;
  padding: 10px 0;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  justify-content: space-around;
}

nav ul li {
  margin-right: 20px;
}

nav a {
  color: #fff;
  text-decoration: none;
  transition: color 0.3s ease;
}

nav a:hover {
  color: #ccc;
}

main {
  padding: 20px;
  background: #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

footer {
  text-align: center;
  padding: 10px;
  background: #333;
  color: #fff;
  position: relative;
  bottom: 0;
  width: 100%;
}

img {
  max-width: 100%;
  height: auto;
}

/* Responsividade */
@media screen and (max-width: 768px) {
  body {
    padding: 10px;
  }
  
  nav ul {
    flex-direction: column;
    align-items: center;
  }
  
  nav ul li {
    margin-right: 0;
    margin-bottom: 10px;
  }
}

@media screen and (max-width: 480px) {
  header {
    padding: 5px 10px;
  }
  
  main {
    padding: 10px;
  }
}