/* Estilo CSS com Flexbox e Grid */

/* === ESTRUTURA GERAL (BODY) === */
/* 
CÓDIGO ANTIGO:
body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f6f8;
  color: #333;
}
*/
body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f6f8;
  color: #333;
  /* Grid Layout para a estrutura da página (NOVO) */
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
}

/* === CABEÇALHO (HEADER) === */
/*
CÓDIGO ANTIGO:
header {
  background-color: #0d9488;
  color: white;
  padding: 15px 20px;
  text-align: center;
}
h1 {
  color: #fbfdfd;
}
*/
header {
  background-color: #0d9488;
  color: white;
  padding: 15px 40px;
  /* Flexbox Layout para o cabeçalho (NOVO) */
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
}

@media (min-width: 768px) {
  header {
    flex-direction: row;
    justify-content: space-between;
  }
}

header h1 {
  margin: 0;
  color: #fbfdfd;
}

/* === NAVEGAÇÃO (NAV) === */
/*
CÓDIGO ANTIGO:
nav {
  margin-top: 10px;
}
nav a {
  color: white;
  text-decoration: none;
  margin: 0 10px;
  font-weight: bold;
}
nav a:hover {
  text-decoration: underline;
}
*/
nav {
  /* Flexbox Layout para a navegação (NOVO) */
  display: flex;
  gap: 15px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: bold;
  padding: 8px 12px;
  border-radius: 4px;
  transition: background-color 0.3s;
}

nav a:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

/* === CONTEÚDO PRINCIPAL (MAIN) === */
/*
CÓDIGO ANTIGO:
main {
  max-width: 800px;
  margin: 20px auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
*/
main {
  width: 100%;
  max-width: 800px;
  margin: 40px auto;
  background: white;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  box-sizing: border-box;
}

main h1 {
  color: #0f766e;
  margin-top: 0;
}

main h2 {
  color: #115e59;
}

img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 15px 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

mark {
  background-color: #fef08a;
  padding: 2px 4px;
  border-radius: 2px;
}

del {
  color: #dc2626;
}

ins {
  color: #16a34a;
}

/* === LISTAS (GRID DE CONTEÚDO) === */
/*
CÓDIGO ANTIGO:
Não existia CSS para <ul> e <li>. As listas usavam o fluxo normal de bloco.
*/
/* Aplicando Grid em listas de conteúdos se aplicável (NOVO) */
main ul {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding-left: 20px;
}

@media (min-width: 600px) {
  main ul {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    padding-left: 0;
    list-style-position: inside;
  }
}

main ul li {
  background-color: #f8fafc;
  padding: 10px 15px;
  border-left: 4px solid #0d9488;
  border-radius: 4px;
  list-style-type: none;
}

/* === RODAPÉ (FOOTER) === */
/*
CÓDIGO ANTIGO:
footer {
  text-align: center;
  padding: 15px;
  background-color: #333;
  color: white;
  margin-top: 30px;
}
*/
footer {
  text-align: center;
  padding: 20px;
  background-color: #1f2937;
  color: white;
}