:root {
  --fundo: #ffffff;
  --texto: #1d1d1f;
  --suave: #5f6368;
  --linha: #dadce0;
  --link: #1a5fb4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fundo: #17181a;
    --texto: #ececec;
    --suave: #a8acb2;
    --linha: #3a3d42;
    --link: #8ab4f8;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--fundo);
  color: var(--texto);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 40px 16px 64px; }
h1 { font-size: 1.7rem; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; }
p, li { overflow-wrap: anywhere; }
a { color: var(--link); }
.sub { color: var(--suave); margin: 0 0 24px; }
nav { border-bottom: 1px solid var(--linha); padding-bottom: 12px; margin-bottom: 24px; }
nav a { margin-right: 16px; }
section.en { border-top: 1px solid var(--linha); margin-top: 40px; padding-top: 8px; }
footer { color: var(--suave); font-size: 0.9rem; border-top: 1px solid var(--linha); margin-top: 40px; padding-top: 12px; }