.center-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 75vh;
}

.sign-in-form {
  background: #f7f7fa;
  max-width: 350px;
  margin: 0 auto;
  padding: 2rem 2rem 1.5rem 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 12px #eaeaea;
  width: 100%;
  
}

h3 {
  text-align: center;
  margin-bottom: 1.5rem;
  color: #2461a6;
}

.input-group {
  margin-bottom: 1.2rem;
}

label {
  display: block;
  margin-bottom: 0.2rem;
  font-weight: 500;
}

input[type="text"], input[type="password"] {
  width: 100%;
  padding: 0.5rem;
  border: 1.5px solid #b3c6e0;
  border-radius: 6px;
  margin-bottom: 0.1rem;
  font-size: 1rem;
  background: #fff;
  transition: border 0.2s;
}

input[type="text"]:focus, input[type="password"]:focus {
  border: 1.5px solid #2461a6;
  outline: none;
}

button[type="submit"] {
  width: 100%;
  background: #2461a6;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.6rem 1.2rem;
  font-size: 1.1rem;
  cursor: pointer;
  font-weight: 600;
  margin-top: 0.3rem;
}

button[type="submit"]:hover {
  background: #184272;
}

.form-errors {
  color: #d9534f;
  font-size: 0.99em;
  margin: 8px 0 5px 0;
  list-style: disc inside;
  padding-left: 0;
}