.page-container {
    display: flex;
    gap: 40px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.sidebar-navigation {
    position: relative;
    width: 280px;
    flex-shrink: 0;
    display: none;
}

@media (min-width: 781px) { /*1024px*/
    .sidebar-navigation {
        display: block;
    }
}

.sidebar-nav {
    position: sticky;
    top: 100px; /* Отступ от верха окна */
    padding: 0; /* 56px 0 */
    transition: opacity 0.3s ease;
}

/* Когда навигация должна исчезнуть */
.sidebar-nav.hidden {
    opacity: 0;
    pointer-events: none;
}

.nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 3px;

    font-size: 1rem;
}

.pin-hiw.nav-list {
    gap: .75rem;
}

.nav-item {
    position: relative;
}

.nav-link {
    position: relative;
    display: block;
    padding: 2px 20px; /* 16px 24px */
    color: #787572; /* #999; */
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}
.pin-hiw .nav-link {
    padding: calc(.4 * 4 * .625 * 1rem) calc(.6 * 4 * .625 * 1rem);
}
.nav-item.active .nav-link,
.nav-item.completed .nav-link {
    color: #292d32; /* #373e42; */
    font-weight: bold;
}

.nav-link:hover {
    color: #373e42;
}

.progress-bar {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #e0e0e0;
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 0%;
    background: var(--primary-page-color-ui);
    border-radius: 2px;
/*    transition: height 0.3s ease; */
}

.nav-item.active .progress-fill {
    height: 100%;
}

.main-content {
    flex: 1;
    min-width: 0;
}

.content-section {
/*    min-height: 600px;
    padding: 40px 0;*/
    scroll-margin-top: 80px; /* Отступ при скролле к якорю */
}