:root {
  --bg: #f6f7f9; --panel: #ffffff; --line: #e2e5ea; --text: #1c2027; --muted: #6b7280;
  --accent: #1c2027; --ok: #1f7a46; --erro: #b32626;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115; --panel: #171a21; --line: #262b36; --text: #e6e9ef; --muted: #8c94a6;
    --accent: #e6e9ef;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--bg); color: var(--text); padding: 24px;
  font: 14px/1.5 ui-sans-serif, -apple-system, "Segoe UI", system-ui, sans-serif;
}
.box {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  padding: 32px; width: 400px; max-width: 100%;
}
.topo { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
h1 { margin: 0; font-size: 22px; letter-spacing: .14em; }
.lang {
  background: transparent; border: 1px solid var(--line); color: var(--muted);
  border-radius: 6px; padding: 4px 8px; font-size: 12px; cursor: pointer;
}
.sub { margin: 4px 0 24px; color: var(--muted); font-size: 13px; }
label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 6px; }
/* O domínio faz parte do campo: quem entra digita só o usuário. */
.campo {
  display: flex; align-items: stretch;
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px; overflow: hidden;
}
.campo:focus-within { outline: 2px solid var(--accent); outline-offset: 1px; }
.campo.invalido { border-color: var(--erro); }
.campo input {
  flex: 1; min-width: 0; padding: 11px 12px; font: inherit; color: var(--text);
  background: transparent; border: none;
}
.campo input:focus { outline: none; }
.dominio {
  display: flex; align-items: center; padding: 0 12px;
  color: var(--muted); font-size: 13px; white-space: nowrap;
  border-left: 1px solid var(--line); background: var(--panel);
}
.erro-campo { margin: 8px 0 0; color: var(--erro); font-size: 12px; }
button {
  width: 100%; margin-top: 14px; padding: 11px; font: inherit; font-weight: 600;
  background: var(--accent); color: var(--panel); border: none; border-radius: 8px; cursor: pointer;
}
button:disabled { opacity: .6; cursor: default; }
.message { margin: 18px 0 0; padding: 11px 13px; border-radius: 8px; font-size: 13px; background: var(--bg); }
.message.ok { color: var(--ok); }
.message.erro { color: var(--erro); }
.hint { margin: 20px 0 0; color: var(--muted); font-size: 12px; }