```css
:root {
  --cor-fundo: #0d1117;
  --cor-painel: #161b22;
  --cor-borda: #30363d;
  --cor-texto: #e6edf3;
  --cor-secundaria: #8b949e;
  --cor-principal: #58a6ff;
  --cor-alerta: #ff7b72;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  padding: 0;
  background-color: var(--cor-fundo);
  color: var(--cor-texto);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
}

main {
  width: 100%;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  padding: 48px 16px;
}

h1 {
  margin-top: 0;
  margin-bottom: 8px;
  font-family: Georgia, serif;
  font-size: 2.4rem;
  font-weight: 400;
}

header p {
  margin-top: 0;
  margin-bottom: 32px;
  color: var(--cor-secundaria);
}

form {
  display: grid;
  grid-template-columns: 1fr 2fr auto;
  grid-template-rows: auto auto;
  grid-auto-flow: column;
  column-gap: 12px;
  row-gap: 6px;
  align-items: end;
  padding: 20px;
  background-co
```