:root {
  --indigo: #4f46e5;
  --indigo-claro: #eef2ff;
  --texto: #0f172a;
  --texto-suave: #475569;
  --borda: #e2e8f0;
  --fundo: #f8fafc;
  --branco: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --texto: #e2e8f0;
    --texto-suave: #94a3b8;
    --borda: #1e293b;
    --fundo: #0b1120;
    --branco: #111827;
    --indigo-claro: #1e1b4b;
  }
}

:root[data-theme="dark"] {
  --texto: #e2e8f0;
  --texto-suave: #94a3b8;
  --borda: #1e293b;
  --fundo: #0b1120;
  --branco: #111827;
  --indigo-claro: #1e1b4b;
}

* { box-sizing: border-box; }

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

.topo {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--branco);
  border-bottom: 1px solid var(--borda);
}

.marca { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--texto); text-decoration: none; }
.marca .logo { width: 32px; height: 32px; border-radius: 8px; background: var(--indigo); color: #fff; display: grid; place-items: center; }

.layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

nav.indice { position: sticky; top: 72px; align-self: start; font-size: 14px; }
nav.indice h2 { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--texto-suave); margin: 0 0 8px; }
nav.indice ol { list-style: none; padding: 0; margin: 0 0 24px; }
nav.indice li { margin: 2px 0; }
nav.indice a { display: block; padding: 6px 10px; border-radius: 8px; color: var(--texto); text-decoration: none; }
nav.indice a:hover { background: var(--indigo-claro); color: var(--indigo); }

main article section { scroll-margin-top: 80px; padding-bottom: 32px; margin-bottom: 32px; border-bottom: 1px solid var(--borda); }
main article section:last-child { border-bottom: 0; }

h1 { font-size: 30px; margin: 8px 0 4px; }
h2 { font-size: 22px; margin: 0 0 8px; }
h3 { font-size: 16px; margin: 20px 0 6px; }
p.lead { color: var(--texto-suave); font-size: 17px; margin-top: 0; }

figure { margin: 16px 0; }
figure img { width: 100%; height: auto; border: 1px solid var(--borda); border-radius: 12px; background: var(--branco); }
figcaption { font-size: 13px; color: var(--texto-suave); margin-top: 6px; }

.dica, .atencao {
  border-left: 4px solid var(--indigo);
  background: var(--indigo-claro);
  padding: 12px 16px;
  border-radius: 8px;
  margin: 16px 0;
}
.atencao { border-left-color: #d97706; background: #fffbeb; color: #111827; }

ol.passos, ul.lista { padding-left: 22px; }
ol.passos li, ul.lista li { margin: 6px 0; }

code, kbd { background: var(--branco); border: 1px solid var(--borda); border-radius: 6px; padding: 1px 6px; font-size: 14px; }

.voltar { font-size: 14px; }
.voltar a { color: var(--indigo); text-decoration: none; }

@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; gap: 16px; }
  nav.indice { position: static; }
}

@media print {
  .topo, nav.indice, .voltar { display: none; }
  body { background: #fff; color: #000; }
  .layout { display: block; padding: 0; }
  main article section { break-inside: avoid-page; }
  figure img { border: 0; }
  a { color: inherit; text-decoration: none; }
}