:root {
  color-scheme: light;
  --azul: #0d638a; --azul-esc: #043d57; --fundo: #eef3f7; --card: #fff; --txt: #13222e; --sub: #56697a; --borda: #d8e1e9; --erro: #b42318; --erro-fundo: #fdf1f0;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { color-scheme: dark; --fundo: #0f161d; --card: #18212a; --txt: #eef3f7; --sub: #a9b7c4; --borda: #2a3642; --erro: #ff8a80; --erro-fundo: #3a1f1d; --link: #8fd0f0; }
}
:root[data-theme="dark"] { color-scheme: dark; --fundo: #0f161d; --card: #18212a; --txt: #eef3f7; --sub: #a9b7c4; --borda: #2a3642; --erro: #ff8a80; --erro-fundo: #3a1f1d; --link: #8fd0f0; }
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px;
  padding: 24px 16px; background: linear-gradient(180deg, var(--azul-esc) 0 180px, var(--fundo) 180px); color: var(--txt);
  font: 14px/1.45 "Segoe UI", system-ui, sans-serif;
}
.caixa { width: min(380px, 100%); background: var(--card); border: 1px solid var(--borda); border-radius: 12px; padding: 28px 26px 22px; box-shadow: 0 10px 30px rgba(4, 61, 87, .18); }
.logo { display: block; height: 56px; margin: 0 auto 12px; border-radius: 3px; }
h1 { margin: 0; text-align: center; font-size: 22px; color: var(--azul); }
.sub { margin: 4px 0 20px; text-align: center; color: var(--sub); font-size: 12.5px; }
form { display: grid; gap: 6px; }
label { font-weight: 600; font-size: 12.5px; margin-top: 6px; }
input { font: inherit; color: var(--txt); background: var(--card); border: 1px solid var(--borda); border-radius: 8px; padding: 10px 12px; }
input:focus-visible { outline: 2px solid var(--azul); outline-offset: 1px; border-color: var(--azul); }
button { margin-top: 12px; font: inherit; font-weight: 700; color: #fff; background: var(--azul); border: 0; border-radius: 8px; padding: 11px; cursor: pointer; }
button:hover:not(:disabled) { filter: brightness(1.1); }
button:disabled { opacity: .6; cursor: wait; }
button:focus-visible { outline: 3px solid #ffd54a; outline-offset: 2px; }
.erro { margin: 8px 0 0; padding: 8px 10px; border-left: 4px solid var(--erro); border-radius: 6px; background: var(--erro-fundo); color: var(--txt); font-size: 13px; }
.erro[hidden] { display: none; }
.dica { margin: 16px 0 0; text-align: center; color: var(--sub); font-size: 12px; }
.dica a { color: var(--link, var(--azul)); font-weight: 600; }
label .nota { font-weight: 400; color: var(--sub); }
form[hidden] { display: none; }
.credito { display: flex; align-items: center; gap: 8px; color: var(--sub); font-size: 11px; }
.credito img { height: 22px; }