body {
    background: linear-gradient(135deg, #0d1117 0%, #161b22 100%);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
}

.login-card {
    background: #161b22;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    width: 100%;
    max-width: 400px;
}

.login-card .form-control {
    background: #0d1117;
    border: 1px solid #30363d;
    color: #c9d1d9;
}

.login-card .form-control:focus {
    border-color: #58a6ff;
    box-shadow: none;
}

.login-card .btn-primary {
    background: #238636;
    border: none;
}

.login-card .btn-primary:hover {
    background: #2ea043;
}

.brand {
    font-size: 1.8rem;
    font-weight: 700;
    color: #58a6ff;
    text-align: center;
    margin-bottom: 1.5rem;
}

.error {
    font-size: 0.9rem;
}