.course-hero {
    padding: var(--sp-16) 0 var(--sp-8);
}

.course-hero__grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: var(--sp-12);
    align-items: start;
}

@media (max-width: 900px) {
    .course-hero__grid {
        grid-template-columns: 1fr;
    }
}

.buy-card {
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    position: sticky;
    top: 96px;
}

.buy-card__media {
    aspect-ratio: 3/2;
}

.buy-card__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.buy-card__body {
    padding: var(--sp-6);
}

.buy-card__price {
    font-family: var(--font-display);
    font-size: 34px;
    font-weight: 800;
}

.body-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: var(--sp-12);
    align-items: start;
}

@media (max-width: 900px) {
    .body-grid {
        grid-template-columns: 1fr;
    }
}

.lesson-block {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--sp-6);
    margin-bottom: var(--sp-4);
    background: var(--color-surface-raised);
}

.lesson-block__head {
    display: flex;
    gap: var(--sp-4);
    align-items: flex-start;
}

.lesson-block__no {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 13px;
    color: var(--color-brand);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-brand-tint);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.lesson-block__chapters {
    margin-top: var(--sp-3);
    display: flex;
    flex-direction: column;
    gap: var(--sp-1);
}

.chapter-row {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-2) var(--sp-3);
    border-radius: var(--radius-sm);
    font-size: 13.5px;
    color: var(--color-muted);
}

.chapter-row:hover {
    background: var(--color-brand-tint);
    color: var(--color-brand-strong);
}

.chapter-row__icon {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-secondary-tint);
    color: var(--color-secondary);
    flex-shrink: 0;
    font-size: 10px;
}

.chapter-row__no {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-faint);
    width: 16px;
}