/* ============================
   FONDO PRINCIPAL
============================ */
#back {
  position: fixed;
  width: 100%;
  height: 100%;
  background: url('vistas/img/plantilla/background.jpg') no-repeat center center fixed;
  background-size: cover;
  z-index: -1;
  opacity: 1;
}

/* ============================
   LOGIN PRINCIPAL
============================ */
.login-box {
  width: 430px;
  margin: 6% auto;
}

.card {
  border-radius: 18px;
  border: none;
  background-color: #ffffff;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.card-header img {
  width: 220px;
  height: auto;
  margin: 15px auto;
  display: block;
}

.login-box-msg {
  font-size: 22px;
  font-weight: bold;
  color: #004aad;
}

/* ============================
   CAMPOS Y BOTONES
============================ */
.form-control-lg {
  font-size: 18px;
  height: 50px;
  text-align: center;
  border-radius: 10px;
  border: 1px solid #ccc;
  transition: 0.3s;
}
.form-control-lg:focus {
  border-color: #007bff;
  box-shadow: 0 0 6px rgba(0, 123, 255, 0.3);
}

.btn-lg {
  font-size: 18px;
  padding: 12px;
  border-radius: 10px;
  font-weight: 600;
}
.btn-primary {
  background-color: #004aad;
  border: none;
}
.btn-primary:hover {
  background-color: #003b8a;
}
.btn-success {
  background-color: #00a859;
  border: none;
}
.btn-success:hover {
  background-color: #008d4c;
}

/* ============================
   BOTÓN FLOTANTE ADMIN
============================ */
.btn-flotante {
  position: fixed;
  bottom: 25px;
  right: 25px;
  width: 60px;
  height: 60px;
  background-color: #004aad;
  color: #fff;
  border-radius: 50%;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  transition: all 0.3s ease;
  z-index: 999;
}
.btn-flotante:hover {
  background-color: #003b8a;
  transform: scale(1.1);
}