body {
  font-family: system-ui, sans-serif;
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
  line-height: 1.4;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

nav a {
  margin-right: 16px;
}

section {
  border-top: 1px solid #ccc;
  margin-top: 24px;
}

label,
input,
select,
textarea,
button {
  display: block;
  margin: 8px 0;
}

textarea {
  width: 100%;
  box-sizing: border-box;
  font-family: ui-monospace, monospace;
}

header button {
  display: inline-block;
}

.aviso,
#mensagem {
  color: #a00;
}

[hidden] {
  display: none !important;
}

table {
  border-collapse: collapse;
  width: 100%;
}

th,
td {
  border-bottom: 1px solid #ddd;
  padding: 4px 8px;
  text-align: left;
}

td input,
td select,
td button {
  margin: 0;
}

label input[type='checkbox'] {
  display: inline;
  margin-right: 8px;
}