body {
    background: linear-gradient(135deg, #e0e7ff 0%, #f4f4f4 100%);
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.upgrade-container {
    background: rgba(255,255,255,0.95);
    padding: 48px 36px 36px 36px;
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(60,60,120,0.10);
    text-align: center;
    max-width: 420px;
    width: 100%;
    transition: box-shadow 0.3s;
    border: 1px solid #e0e7ff;
}

.upgrade-container:hover {
    box-shadow: 0 12px 40px rgba(60,60,120,0.18);
}

.upgrade-image, .upgrade-icon {
    display: block;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 24px;
}

.upgrade-image {
    width: 110px;
    height: 110px;
    object-fit: cover;
    border-radius: 50%;
    margin-bottom: 22px;
    box-shadow: 0 2px 12px rgba(60,60,120,0.10);
    border: 3px solid #a5b4fc;
    background: #f1f5ff;
}

.upgrade-icon svg {
    display: block;
    margin: 0 auto 24px auto;
}

h1 {
    color: #3730a3;
    font-size: 2.1rem;
    margin-bottom: 18px;
    letter-spacing: 0.5px;
}

p {
    color: #4b5563;
    font-size: 1.13rem;
    line-height: 1.7;
    margin-bottom: 0;
}

@media (max-width: 600px) {
    .upgrade-container {
        padding: 28px 10px 20px 10px;
        max-width: 95vw;
    }
    .upgrade-image {
        width: 80px;
        height: 80px;
    }
    h1 {
        font-size: 1.3rem;
    }
    p {
        font-size: 1rem;
    }
}