body {
  margin: 0;
  padding: 0;
  background: #e6e9ee;
  font-family: Arial, Verdana, sans-serif;
  color: #000;
}

/* TOPO */
.header {
  background: linear-gradient(#4b4f56, #2f3237);
  padding: 10px 20px;
  color: #fff;
  border-bottom: 1px solid #000;
}

.header h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: 1px;
}

/* BARRA DE NAVEGAÇÃO */
.nav {
  background: linear-gradient(#f5f6f8, #cfd4db);
  padding: 8px;
  border-bottom: 1px solid #999;
}

.nav a {
  color: #0033cc;
  text-decoration: none;
  margin-right: 15px;
  font-weight: bold;
  font-size: 13px;
}

.nav a:hover {
  text-decoration: underline;
}

/* CONTAINER GERAL */
.container {
  display: flex;
  max-width: 1200px;
  margin: 15px auto;
}

/* COLUNAS */
.left,
.right {
  width: 220px;
}

.center {
  flex: 1;
  margin: 0 15px;
}

/* CAIXAS PADRÃO */
.box {
  background: linear-gradient(#ffffff, #dde2e8);
  border: 1px solid #9aa1aa;
  padding: 10px;
  margin-bottom: 15px;
  font-size: 13px;
}

/* TÍTULOS */
.box h2 {
  margin: 0 0 8px 0;
  font-size: 14px;
  color: #0033cc;
  border-bottom: 1px solid #ccc;
  padding-bottom: 4px;
}

/* BOTÕES */
.button {
  display: inline-block;
  background: linear-gradient(#fdfdfd, #bfc6ce);
  border: 1px solid #7f8894;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: bold;
  color: #000;
  cursor: pointer;
  box-shadow: inset 1px 1px 0 #fff;
  text-decoration: none;
}

/* HOVER */
.button:hover {
  background: linear-gradient(#ffffff, #aeb6c0);
}

/* BOTÃO AFUNDANDO */
.button:active {
  background: linear-gradient(#aeb6c0, #ffffff);
  box-shadow: inset 2px 2px 4px rgba(0,0,0,0.4);
  transform: translateY(1px);
}

/* LISTA DE ITENS */
.item {
  display: flex;
  align-items: center;
  margin-bottom: 10px;
}

.item img {
  width: 40px;
  height: 40px;
  margin-right: 10px;
  border: 1px solid #999;
}

/* RODAPÉ */
.footer {
  text-align: center;
  font-size: 11px;
  color: #555;
  margin: 20px 0;
}