body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding: 20px;
}

.card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    border: none;
    padding: 2rem;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.message-box {
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 2rem 0;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 10px;
}

.btn-primary {
    background-color: #4a90e2;
    border: none;
    padding: 12px 30px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: #357abd;
    transform: scale(1.05);
}

.btn-primary:disabled {
    background-color: #6c757d;
    transform: none;
}

.spinner-border {
    width: 3rem;
    height: 3rem;
    margin: 1rem;
}

.message-animate {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .card {
        padding: 1rem;
    }
    
    .btn-primary {
        padding: 10px 20px;
    }
    
    .message-box {
        margin: 1rem 0;
    }
}