body {
  height: 100%;
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(120deg, #f8f9fa, #e3f2fd);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

main {
  flex: 1;
}


.card {
    background-color: #ffffff;
    border-radius: 12px;
    border: none;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.05);
}


.card-title {
    font-weight: 600;
    color: #343a40;
}


.form-control {
    border-radius: 6px;
}


.btn-primary {
    background-color: #1976d2;
    border-color: #1976d2;
    font-weight: 500;
    transition: background-color 0.2s ease-in-out;
}

.btn-primary:hover {
    background-color: #1565c0;
    border-color: #1565c0;
}


.invalid-feedback {
    font-size: 0.9em;
}