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

body {
  font-family: Arial, sans-serif;
  background-color: #dddddd;
  color: #222;
  padding: 20px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  background-color: #ffffff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

header {
  background-color: antiquewhite;
  text-align: center;
  padding: 25px 20px;
}

header h1 {
  font-size: 32px;
  margin-bottom: 8px;
}

.subtitulo {
  font-size: 18px;
  color: #555;
}

.conteudo {
  display: flex;
  gap: 20px;
  padding: 25px;
  align-items: flex-start;
}

.lateral {
  width: 30%;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.principal {
  width: 70%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.card {
  background-color: #f3f3f3;
  border-radius: 10px;
  padding: 20px;
}

.card h2 {
  color: #333;
  margin-bottom: 12px;
  border-bottom: 2px solid antiquewhite;
  padding-bottom: 6px;
}

.card h3 {
  margin-bottom: 10px;
}

.card ul {
  padding-left: 20px;
}

.card li {
  margin-bottom: 8px;
}

.card p {
  line-height: 1.6;
}

footer {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: bisque;
  padding: 18px 20px;
}

.github-link {
  color: black;
  text-decoration: none;
  font-weight: bold;
  padding: 10px 18px;
  border-radius: 6px;
  background-color: antiquewhite;
  transition: 0.3s;
}

.github-link:hover {
  background-color: #f0d2a8;
}

@media (max-width: 900px) {
  .conteudo {
    flex-direction: column;
  }

  .lateral,
  .principal {
    width: 100%;
  }

  .principal {
    grid-template-columns: 1fr;
  }

  header h1 {
    font-size: 26px;
  }
}