.upgrade-popup-wrapper {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 999;
    background-color: rgba(2, 39, 57, 0.6);
    align-items: center;
    justify-content: center;
    font-family: 'OpenSans', Arial, Helvetica, sans-serif;
}

.upgrade-popup-wrapper.open {
    display: flex;
}

.upgrade-popup-wrapper .upgrade-popup-card {
    background: #fff;
    border-radius: 1rem;
    padding: 2.5rem 2rem;
    max-width: 420px;
    width: 90%;
    text-align: center;
    position: relative;
    box-shadow: 0 8px 32px rgba(0,0,0,0.18);
}

.upgrade-popup-wrapper .upgrade-popup-title {
    font-family: TeX, serif;
    font-weight: bold;
    color: #1a1a1a;
    margin: 0 0 0.75rem;
}

.upgrade-popup-wrapper .upgrade-popup-message {
    color: #444;
    line-height: 1.5;
    margin-bottom: 1.75rem;
    font-size: 1.25em;
}

.upgrade-popup-wrapper .upgrade-popup-actions {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    font-size: 1.15em;
}

.upgrade-popup-wrapper .upgrade-popup-btn-primary {
    background-color: #ff7000;
    color: #fff;
    border: none;
    border-radius: 50px;
    padding: 0.6em 1.75em;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: background-color 0.2s;
}

.upgrade-popup-wrapper .upgrade-popup-btn-primary:hover {
    background-color: #e06200;
    color: #fff;
    text-decoration: none;
}

.upgrade-popup-wrapper .upgrade-popup-btn-secondary {
    background-color: transparent;
    color: #666;
    border: 1.5px solid #ccc;
    border-radius: 50px;
    padding: 0.6em 1.75em;
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s;
}

.upgrade-popup-wrapper .upgrade-popup-btn-secondary:hover {
    border-color: #999;
    color: #333;
}