html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
  background: radial-gradient(1200px circle at 20% 10%, #ffffff, #f2f2f2 45%, #e9e9e9 100%);
  color: #0f0f0f;
}

.pantalla {
  height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
}

.tarjeta {
  width: 100%;
  max-width: 440px;
  background: #ffffff;
  border: 1px solid #e6e6e6;
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.encabezado {
  margin-bottom: 18px;
  text-align: center;
}

.logo-login {
  height: 36px;
  width: auto;
  margin-bottom: 8px;
}

.subtitulo {
  font-size: 13px;
  color: #666666;
  margin-top: 6px;
}

.formulario {
  display: grid;
  gap: 14px;
}

.campo {
  display: grid;
  gap: 8px;
}

label {
  font-size: 12px;
  color: #4d4d4d;
}

input {
  width: 100%;
  box-sizing: border-box;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid #d9d9d9;
  background: #fafafa;
  color: #0f0f0f;
  outline: none;
}

input:focus {
  border-color: #bdbdbd;
}

.boton {
  margin-top: 6px;
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid #0f0f0f;
  background: #0f0f0f;
  color: #ffffff;
  cursor: pointer;
  font-weight: 600;
}

.boton:hover {
  background: #000000;
}

.alerta {
  border: 1px solid #e0e0e0;
  background: #f6f6f6;
  padding: 12px;
  border-radius: 12px;
  color: #0f0f0f;
  font-size: 13px;
}

.pie {
  margin-top: 18px;
  color: #808080;
  font-size: 12px;
}