body {
    background-color: #ffffff;
    font-family: 'Segoe UI', sans-serif;
  }

/* Base style (mobile-first) */
.register-container {
  width: 90%;
  max-width: 350px;
  margin: 40px auto;
  background-color: #f9f9f9;
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

.register-logo {
  text-align: center;
  margin-bottom: 20px;
}

.register-logo img {
  width: 60px;
}

/* Tablet (≥ 768px) */
@media (min-width: 768px) {
  .register-container {
    max-width: 700px;
    padding: 30px;
  }

  .register-logo img {
    width: 60px;
  }
}

/* Desktop (≥ 992px) */
@media (min-width: 992px) {
  .register-container {
    margin-top: 60px;
    padding: 40px;
    max-width: 800px;
  }

  .register-logo img {
    width: 60px;
  }
}

  .btn-santaka {
    background-color: #1D225F;
    color: #fff;
    transition: 0.3s;
  }

  .btn-santaka:hover {
    background-color: #3F5BFA;
    color: #fff;
  }

  .form-control:focus {
    border-color: #3F5BFA;
    box-shadow: 0 0 0 0.25rem rgba(63, 91, 250, 0.25);
  }

  .text-santaka {
    color: #1D225F;
  }