body {
    background: linear-gradient(135deg, #27ae60 0%, #2ecc71 100%);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Vazir', 'Vazirmatn', Tahoma, sans-serif;
}
.login-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}
.btn-login {
    width: 100%;
    padding: 12px;
    font-size: 1.1rem;
    font-weight: bold;
}