.intro-instructor__media {
    width: 20rem;
    height: 24rem;
}

.intro-instructor__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}


.content-rail__side {
    flex-shrink: 0;
}

@media (min-width: 1024px) {
    .content-rail__side {
        width: 8rem;
    }

    .content-rail__vertical {
        writing-mode: vertical-rl;
        text-orientation: mixed;
    }
}

.tips-numbered__card {
    max-width: 24rem;
}

.tips-numbered__thumb {
    width: 4rem;
    height: 4rem;
}

/* glossary folders — summary marker hide, folder hover */
.glossary-folders__sum::-webkit-details-marker {
    display: none;
}

.glossary-folders__sum {
    list-style: none;
}

.glossary-folders__folder {
    transition: transform 0.2s ease;
}

.glossary-folders__folder:hover {
    transform: translateY(-2px);
}


.invite-boost__section {
    padding-top: 6rem;
    padding-bottom: 6rem;
}

@keyframes invite-boost-flare-throb-cycle {
    0%, 100% { opacity: 1; }
    50%       { opacity: .5; }
}
.invite-boost__flare--throb {
    animation: invite-boost-flare-throb-cycle 2s cubic-bezier(.4,0,.6,1) infinite;
}

@keyframes invite-boost-flare-rebound-cycle {
    0%, 100% { transform: translateY(0); animation-timing-function: cubic-bezier(.8,0,1,1); }
    50%       { transform: translateY(-25%); animation-timing-function: cubic-bezier(0,0,.2,1); }
}
.invite-boost__flare--rebound {
    animation: invite-boost-flare-rebound-cycle 1s infinite;
}

@keyframes invite-boost-flare-ping-cycle {
    75%, 100% { transform: scale(2); opacity: 0; }
}
.invite-boost__flare--ping {
    animation: invite-boost-flare-ping-cycle 1s cubic-bezier(0,0,.2,1) infinite;
}

@keyframes invite-boost-stroke-throb-cycle {
    0%, 100% { opacity: 1; }
    50%       { opacity: .5; }
}
.invite-boost__stroke--throb {
    animation: invite-boost-stroke-throb-cycle 2s cubic-bezier(.4,0,.6,1) infinite;
}

.invite-boost__layer--lift:hover { transform: scale(1.05); transition: transform .2s ease; }

.invite-boost__flare--lift:hover { transform: scale(1.25); transition: transform .2s ease; }

.invite-boost__action--lift:hover { transform: scale(1.05); transition: transform .2s ease; }