:root {
  --azul-if: #1b4d3e;
  --azul-if-escuro: #0f2f26;
  --cinza-100: #f5f6f7;
  --cinza-300: #d8dcdf;
  --cinza-600: #5c6570;
  --texto: #1f2937;
  --erro: #b00020;
  --sucesso: #1a7f37;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--cinza-100);
  color: var(--texto);
}

.tela-central {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.cartao {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(0,0,0,.08), 0 8px 24px rgba(0,0,0,.06);
  padding: 32px;
  width: 100%;
  max-width: 420px;
}

.cartao h1 {
  font-size: 1.25rem;
  margin: 0 0 4px;
  color: var(--azul-if-escuro);
}

.cartao .instituicao {
  font-size: .85rem;
  color: var(--cinza-600);
  margin-bottom: 24px;
}

label {
  display: block;
  font-size: .875rem;
  font-weight: 600;
  margin-bottom: 6px;
}

input[type="text"],
input[type="password"],
select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--cinza-300);
  border-radius: var(--radius);
  font-size: 1rem;
  margin-bottom: 16px;
}

input:focus, select:focus, button:focus {
  outline: 3px solid #9dc7bb;
  outline-offset: 1px;
}

.grupo-codigo {
  position: relative;
}

.grupo-codigo button.alternar {
  position: absolute;
  right: 10px;
  top: 10px;
  background: none;
  border: none;
  color: var(--azul-if);
  font-size: .8rem;
  cursor: pointer;
}

button.primario {
  width: 100%;
  padding: 13px;
  background: var(--azul-if);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

button.primario:disabled {
  opacity: .6;
  cursor: not-allowed;
}

button.primario:hover:not(:disabled) { background: var(--azul-if-escuro); }

.aviso {
  font-size: .78rem;
  color: var(--cinza-600);
  margin-top: 20px;
  line-height: 1.5;
}

.erro {
  background: #fdecea;
  color: var(--erro);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: .875rem;
  margin-bottom: 16px;
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,.5);
  border-top-color: #fff;
  border-radius: 50%;
  animation: girar .6s linear infinite;
  vertical-align: middle;
  margin-right: 8px;
}

@keyframes girar { to { transform: rotate(360deg); } }