:root {
  --fundo: #ffffff;
  --texto: #1f2933;
  --suave: #5f6c7b;
  --link: #1a56b0;
  --codigo: #eef1f5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fundo: #14181d;
    --texto: #e6e9ed;
    --suave: #9aa5b1;
    --link: #8ab4f8;
    --codigo: #252b33;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--fundo);
  color: var(--texto);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; }
p, ul, ol { margin: 0 0 12px; }
li { margin-bottom: 6px; }
a { color: var(--link); }
code { background: var(--codigo); padding: 2px 6px; border-radius: 4px; font-size: 0.9em; }

.lead { font-size: 1.15rem; }
.data, .voltar { color: var(--suave); font-size: 0.95rem; }