/* Estilos Gerais */
body {
  font-family: Arial, sans-serif;
  margin: 20px;
}

section {
  margin-bottom: 40px;
}

h2 {
  margin-top: 40px;
  border-bottom: 2px solid #ccc;
  padding-bottom: 10px;
}

.grid-container {
  display: grid;
  background-color: #eee;
  padding: 10px;
}

.item-grid {
  background-color: #2196f3;
  color: white;
  padding: 20px;
  font-size: 1.2em;
  text-align: center;
  margin: 5px;
}

/* 1. Grid Básico com Linhas e Colunas Definidas */
.basico {
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: 100px 100px;
  grid-gap: 10px;
}

/* 2. Uso de repeat(), minmax() e fr */
.repeat-minmax {
  grid-template-columns: repeat(4, minmax(100px, 1fr));
  grid-auto-rows: 100px;
  grid-gap: 10px;
}

/* 3. Grid Responsivo com auto-fit e minmax() */
.auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  grid-auto-rows: 100px;
  grid-gap: 10px;
}

/* 4. Grid com Posicionamento de Itens e Sobreposição */
.sobreposicao {
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: 100px 100px;
  grid-gap: 10px;
  position: relative;
}

.sobreposicao .item-grid {
  background-color: rgba(33, 150, 243, 0.8);
}

.item1 {
  grid-column: 1 / 3;
  grid-row: 1 / 2;
  z-index: 2;
}

.item2 {
  grid-column: 2 / 4;
  grid-row: 1 / 2;
  z-index: 1;
}

.item3 {
  grid-column: 1 / 2;
  grid-row: 2 / 3;
}

.item4 {
  grid-column: 3 / 4;
  grid-row: 2 / 3;
}

/* 5. Grid com Áreas Nomeadas e Alinhamento */
.areas-nomeadas {
  grid-template-areas:
    "cabecalho cabecalho"
    "menu conteudo"
    "rodape rodape";
  grid-template-columns: 1fr 2fr;
  grid-template-rows: auto;
  grid-gap: 10px;
}

.cabecalho {
  grid-area: cabecalho;
  background-color: #4caf50;
}

.menu {
  grid-area: menu;
  background-color: #2196f3;
}

.conteudo {
  grid-area: conteudo;
  background-color: #f44336;
}

.rodape {
  grid-area: rodape;
  background-color: #9c27b0;
}

/* Alinhamento */
.areas-nomeadas {
  align-items: center;
  justify-items: center;
}

/* 6. Grid com Grid Aninhado */
.grid-aninhado {
  grid-template-columns: repeat(2, 1fr);
  grid-gap: 10px;
}

.subgrid-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 5px;
}

.subitem-grid {
  background-color: #ff9800;
  padding: 10px;
  color: #fff;
}

/* 7. Exemplo Prático: Layout Completo de Página */
.layout-pagina {
  grid-template-areas:
    "header header header"
    "nav main aside"
    "footer footer footer";
  grid-template-columns: 1fr 2fr 1fr;
  grid-template-rows: auto 1fr auto;
  height: 500px;
  grid-gap: 10px;
}

.header {
  grid-area: header;
  background-color: #3f51b5;
  color: #fff;
}

.nav {
  grid-area: nav;
  background-color: #f44336;
  color: #fff;
}

.main {
  grid-area: main;
  background-color: #2196f3;
  color: #fff;
}

.aside {
  grid-area: aside;
  background-color: #ff9800;
  color: #fff;
}

.footer {
  grid-area: footer;
  background-color: #4caf50;
  color: #fff;
}

/* Responsividade */
@media (max-width: 768px) {
  .layout-pagina {
    grid-template-areas:
      "header"
      "nav"
      "main"
      "aside"
      "footer";
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    height: auto;
  }
}