/* ------- helper --------*/
.f-fixed {
    width: 48vw;
    z-index: 50;
    position: fixed;
    top: 0;
}

/* -------   theme     ----------- */
#app {
    margin-left: auto;
    margin-right: auto;
    width: 100%;
    max-width: 48rem;
    background-color: #f8f9fb;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
}
.tel-prefix {
    flex-shrink: 0;
    width: 100px;
}
.protocol-content {
    padding: 0 0.65rem;
    margin: 0.85rem 0;
}
.protocol-content p {
    margin: 0.65rem;
}
.msg-content p {
    margin: 1rem 0 0.5rem;
}
.van-tab--shrink {
    padding-left: 0.5rem;
    padding-right: 0.5rem;
}
.btn-upgrade {
    bottom: 1rem;
}
@media (max-width: 520px) {
    .btn-upgrade {
        bottom: 0.45rem;
        transform: scale(0.85);
    }
}