body {
    background-color: #121212;
    font-family: 'Helvetica Neue', Arial, sans-serif;
    color: #e0e0e0;
}
.login-container {
    max-width: 400px;
    margin: 100px auto;
}
.card {
    border: none;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    background-color: #1e1e1e;
}
.card-header {
    background-color: #2d2d2d;
    color: #ffffff;
    border-bottom: 1px solid #424242;
    padding: 20px;
    border-radius: 8px 8px 0 0 !important;
}
.card-body {
    padding: 30px;
    background-color: #252525;
    border-radius: 0 0 8px 8px;
}
.form-control {
    border: 1px solid #424242;
    padding: 12px 15px;
    border-radius: 4px;
    background-color: #333333;
    color: #e0e0e0;
}
.form-control:focus {
    border-color: #616161;
    box-shadow: 0 0 0 0.25rem rgba(97, 97, 97, 0.25);
    background-color: #424242;
    color: #ffffff;
}
.btn-login {
    background-color: #424242;
    color: #ffffff;
    border: none;
    padding: 12px;
    font-weight: 500;
    transition: all 0.3s;
}
.btn-login:hover {
    background-color: #616161;
}
.alert {
    border-radius: 4px;
    border: 1px solid #424242;
}
.alert-success {
    background-color: #1b5e20;
    color: #a5d6a7;
    border-color: #2e7d32;
}
.alert-danger {
    background-color: #b71c1c;
    color: #ffcdd2;
    border-color: #c62828;
}
.register-link {
    color: #9e9e9e;
    margin-top: 20px;
    text-align: center;
    font-size: 14px;
}
.register-link a {
    color: #bdbdbd;
    font-weight: 500;
    text-decoration: none;
}
.register-link a:hover {
    text-decoration: underline;
    color: #e0e0e0;
}
.modal-content {
    border: none;
    border-radius: 8px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
    background-color: #1e1e1e;
}
.modal-header {
    background-color: #2d2d2d;
    color: #ffffff;
    border-bottom: 1px solid #424242;
}
.modal-body {
    padding: 25px;
    background-color: #252525;
    color: #e0e0e0;
}
.btn-close {
    opacity: 0.8;
    filter: invert(1);
}
.text-muted {
    color: #757575 !important;
}
.form-label {
    color: #bdbdbd;
    font-weight: 500;
}
.form-select {
    background-color: #333333;
    color: #e0e0e0;
    border: 1px solid #424242;
}
.form-select:focus {
    background-color: #424242;
    color: #ffffff;
    border-color: #616161;
}