:root {
  --azul: #1d4ed8;
  --azul-escuro: #1e3a8a;
  --azul-claro: #eef2ff;
  --fundo: #f5f7fb;
  --texto: #1f2937;
  --muted: #6b7280;
  --borda: #e5e7eb;
  --perigo: #b91c1c;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--fundo); color: var(--texto); font-size: 16px; line-height: 1.5;
}
a { color: var(--azul); text-decoration: none; }
h1 { font-size: 1.5rem; margin: .5rem 0 1rem; line-height: 1.25; }
h2 { font-size: 1.1rem; margin: 1.5rem 0 .75rem; }

/* Marca */
.marca { font-weight: 800; letter-spacing: .5px; color: var(--azul-escuro); font-size: 1.15rem; }
.marca span { color: var(--azul); }

/* Topo */
.topo {
  position: sticky; top: 0; z-index: 10; background: #fff; border-bottom: 1px solid var(--borda);
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .5rem 1rem;
  padding: .6rem 1rem; padding-top: calc(.6rem + env(safe-area-inset-top));
}
.busca { order: 3; flex-basis: 100%; }
.busca input { padding: .5rem .8rem; background: var(--fundo); }

/* Abas (barra inferior no celular) */
.abas {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 10; display: flex;
  background: #fff; border-top: 1px solid var(--borda); padding-bottom: env(safe-area-inset-bottom);
}
.abas a { flex: 1; text-align: center; padding: .85rem .5rem; color: var(--muted); font-weight: 600; font-size: .95rem; }
.abas a.ativo { color: var(--azul); }

.conteudo { max-width: 860px; margin: 0 auto; padding: 1rem 1rem calc(6rem + env(safe-area-inset-bottom)); }

@media (min-width: 800px) {
  .busca { order: 0; flex: 1 1 auto; max-width: 420px; }
  .abas { position: static; justify-content: center; border-top: 0; border-bottom: 1px solid var(--borda); padding-bottom: 0; }
  .abas a { flex: 0 0 auto; padding: .7rem 1.4rem; }
  .conteudo { padding-bottom: 3rem; }
}

/* Cartões e listas */
.cartao { background: #fff; border: 1px solid var(--borda); border-radius: 12px; padding: 1rem; }
.lista { display: flex; flex-direction: column; gap: .5rem; }
.item { display: block; background: #fff; border: 1px solid var(--borda); border-radius: 10px; padding: .75rem 1rem; color: inherit; }
.item-acoes { display: flex; align-items: center; gap: .25rem; }
.item-corpo { flex: 1; min-width: 0; color: inherit; }
.item-titulo { font-weight: 600; overflow-wrap: anywhere; }
.item-meta { font-size: .85rem; color: var(--muted); }
.selo {
  display: inline-block; background: var(--azul-claro); color: var(--azul-escuro); border-radius: 6px;
  padding: 0 .45rem; font-size: .75rem; font-weight: 600; margin-right: .3rem;
}
.grade { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: .6rem; }
.disc { display: flex; flex-direction: column; gap: .25rem; color: inherit; }
.disc span { font-size: .8rem; color: var(--muted); }
.resumo { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.num b { display: block; font-size: 1.6rem; color: var(--azul-escuro); }
.num span { color: var(--muted); font-size: .85rem; }
.cab-secao { display: flex; justify-content: space-between; align-items: center; gap: .5rem; }
.trilha { font-size: .85rem; color: var(--muted); margin: .25rem 0; }

/* Botões */
.btn {
  display: inline-block; border: 1px solid var(--borda); background: #fff; color: var(--texto);
  border-radius: 8px; padding: .55rem 1rem; font: inherit; font-weight: 600; cursor: pointer; text-align: center;
}
.btn.primario { background: var(--azul); border-color: var(--azul); color: #fff; }
.btn.perigo { color: var(--perigo); }
.btn:disabled { opacity: .6; }
.btn-link { background: none; border: 0; color: var(--azul); font: inherit; font-size: .85rem; cursor: pointer; padding: .4rem; white-space: nowrap; }
.btn-link.perigo { color: var(--perigo); }
.botoes { display: flex; flex-wrap: wrap; gap: .5rem; margin: .75rem 0; }

/* Formulários */
input, select, textarea {
  width: 100%; font: inherit; font-size: 16px; padding: .6rem .7rem;
  border: 1px solid #d1d5db; border-radius: 8px; background: #fff; color: inherit;
}
textarea { resize: vertical; }
.form { display: flex; flex-direction: column; gap: .9rem; }
.form label { display: flex; flex-direction: column; gap: .3rem; font-weight: 600; font-size: .9rem; }
.form label.check { flex-direction: row; align-items: center; gap: .5rem; font-weight: 400; }
.check input { width: auto; }
.duas { display: grid; grid-template-columns: 1fr 1fr; gap: .9rem; }
@media (max-width: 600px) { .duas { grid-template-columns: 1fr; } }
.linha-form { display: flex; gap: .5rem; margin: .75rem 0 0; }
.linha-form input { flex: 1; }
.linha-form .btn { white-space: nowrap; }

/* Árvore de assuntos */
.arvore { list-style: none; margin: 0; padding: 0; }
.arvore li { display: flex; align-items: center; gap: .25rem; border-bottom: 1px solid var(--borda); }
.arvore li a { flex: 1; min-width: 0; padding: .55rem .25rem; color: inherit; overflow-wrap: anywhere; }
.arvore li.sub a { padding-left: 1.4rem; font-size: .95rem; }
.arvore li.sub a::before { content: "↳ "; color: var(--muted); }
.arvore li.sel a { color: var(--azul); font-weight: 700; }
.acoes { display: flex; flex-shrink: 0; }

/* Leitura de material */
.texto { overflow-wrap: break-word; margin-top: 1rem; }
.texto h1, .texto h2, .texto h3 { line-height: 1.3; }
.texto table { border-collapse: collapse; display: block; overflow-x: auto; max-width: 100%; }
.texto th, .texto td { border: 1px solid var(--borda); padding: .4rem .6rem; text-align: left; vertical-align: top; }
.texto th { background: var(--azul-claro); }
.texto img { max-width: 100%; }
.texto blockquote { margin: .75rem 0; padding: .5rem 1rem; border-left: 4px solid var(--azul); background: var(--azul-claro); border-radius: 0 8px 8px 0; }
.imagem { max-width: 100%; border-radius: 10px; margin: .5rem 0; display: block; }
.pre { white-space: pre-wrap; }

/* Utilidades */
.muted { color: var(--muted); }
.pequeno { font-size: .85rem; }
.erro { color: var(--perigo); font-weight: 600; }
.caixa-centro { max-width: 380px; margin: 12vh auto 0; padding: 1rem; text-align: center; }
.caixa-centro .form { text-align: left; margin-top: 1.5rem; }
.caixa-centro .marca { font-size: 1.8rem; }
.toast {
  position: fixed; left: 50%; transform: translateX(-50%); bottom: calc(5rem + env(safe-area-inset-bottom));
  background: #111827; color: #fff; padding: .6rem 1rem; border-radius: 8px; z-index: 50;
  max-width: 90%; font-size: .9rem; text-align: center;
}
.toast.erro { background: var(--perigo); }