:root {
  --azul: #1d4ed8;
  --azul-oscuro: #1e3a8a;
  --gris: #6b7280;
  --fondo: #f3f4f6;
  --error: #dc2626;
  --exito: #16a34a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--fondo);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  padding: 24px;
}

.card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  padding: 32px;
  width: 100%;
  max-width: 420px;
}

h1 {
  font-size: 1.4rem;
  margin: 0 0 4px;
  color: #111827;
}

.subtitle {
  color: var(--gris);
  font-size: 0.9rem;
  margin: 0 0 24px;
}

form {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #374151;
  margin-top: 12px;
}

input, select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 0.95rem;
  margin-top: 4px;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--azul);
  box-shadow: 0 0 0 3px rgba(29,78,216,0.15);
}

.fila-doble {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

button {
  margin-top: 24px;
  background: var(--azul);
  color: #fff;
  border: none;
  padding: 12px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

button:hover { background: var(--azul-oscuro); }
button:disabled { background: #9ca3af; cursor: not-allowed; }

.mensaje {
  margin-top: 12px;
  font-size: 0.85rem;
  min-height: 1.2em;
}

.mensaje.error { color: var(--error); }
.mensaje.exito { color: var(--exito); }