.vt-learning-navigation-group {
    margin-block-start: 2rem;
    padding: 1rem;
    border: 1px solid var(--vt-color-border);
    border-radius: var(--vt-radius-md);
    background: var(--vt-color-surface);
}
.vt-learning-navigation-group + .vt-learning-navigation-group { margin-block-start: 1rem; }
.vt-learning-navigation-group__header {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: .45rem .7rem;
    margin-block-end: .85rem;
    padding-block-end: .8rem;
    border-block-end: 1px solid var(--vt-color-border);
}
.vt-learning-navigation-group__header span {
    display: inline-flex;
    align-items: center;
    min-height: 1.8rem;
    padding-inline: .65rem;
    border-radius: 999px;
    background: var(--vt-color-surface-soft);
    color: var(--vt-color-muted);
    font-size: .72rem;
    font-weight: 700;
}
.vt-learning-navigation-group__header h2 {
    margin: 0;
    color: var(--vt-color-text);
    font-size: 1rem;
    line-height: 1.7;
}
.vt-lesson-navigation {
    display: grid;
    gap: 1rem;
    margin: 0;
}
.vt-lesson-navigation__card {
    display: grid;
    grid-template-columns: 4.5rem minmax(0,1fr) auto;
    align-items: center;
    gap: 1rem;
    min-width: 0;
    padding: .8rem;
    border: 1px solid var(--vt-color-border);
    border-radius: var(--vt-radius-md);
    background: var(--vt-color-surface-soft);
    color: inherit;
    text-decoration: none;
    transition: border-color var(--vt-transition), transform var(--vt-transition), background var(--vt-transition);
}
.vt-lesson-navigation__card:hover {
    border-color: var(--vt-color-primary-border);
    background: var(--vt-color-surface);
    transform: translateY(-2px);
}
.vt-lesson-navigation__media {
    display: block;
    width: 4.5rem;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    border-radius: .7rem;
    background: var(--vt-color-surface);
}
.vt-lesson-navigation__media img { width: 100%; height: 100%; object-fit: cover; }
.vt-lesson-navigation__placeholder { display:flex; align-items:center; justify-content:center; width:100%; height:100%; font-weight:800; color:var(--vt-color-muted); }
.vt-lesson-navigation__body { display:flex; flex-direction:column; min-width:0; gap:.25rem; }
.vt-lesson-navigation__body small { color:var(--vt-color-muted); font-size:.72rem; }
.vt-lesson-navigation__body strong { overflow:hidden; font-size:.9rem; text-overflow:ellipsis; white-space:nowrap; }
.vt-lesson-navigation__arrow { font-size:1.2rem; }
@media (min-width: 48rem) {
    .vt-lesson-navigation { grid-template-columns: repeat(2,minmax(0,1fr)); }
    .vt-lesson-navigation__card:only-child { grid-column: 1 / -1; max-width: 32rem; }
}
@media (max-width: 36rem) {
    .vt-learning-navigation-group { padding: .8rem; }
    .vt-learning-navigation-group__header { align-items: flex-start; flex-direction: column; }
    .vt-lesson-navigation__card { grid-template-columns: 3.75rem minmax(0,1fr) auto; gap:.7rem; }
    .vt-lesson-navigation__media { width:3.75rem; }
}