.lessons-shell {
    width: min(1180px, calc(100% - 2rem));
    margin: 0 auto;
    padding: 2rem 0 3rem;
    display: grid;
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 1.25rem;
    align-items: start;
}

.lessons-main {
    display: grid;
    gap: 1rem;
    min-width: 0;
}

.lessons-card {
    border: 1px solid rgba(16, 185, 129, 0.12);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.94);
    box-shadow: 0 18px 45px -34px rgba(15, 23, 42, 0.38);
    padding: 1.25rem;
}

.lessons-panel {
    display: grid;
    gap: 1rem;
}

.lessons-sidebar {
    position: sticky;
    top: 88px;
    display: grid;
    gap: 1rem;
}

.lessons-sidebar-header h2 {
    color: var(--text-dark);
    margin-bottom: 0.35rem;
}

.lessons-sidebar-nav {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.55rem;
}

.lessons-sidebar-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    min-height: 52px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #f8fafc;
    color: var(--text-dark);
    text-decoration: none;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.lessons-sidebar-link:hover,
.lessons-sidebar-link:focus-visible {
    background: var(--primary-light);
    border-color: #b7e4c7;
    color: var(--primary-dark);
    outline: none;
    transform: translateY(-1px);
}

.lessons-sidebar-link .material-icons {
    font-size: 1.35rem;
}

.lessons-sidebar-link-label {
    position: absolute;
    left: 50%;
    bottom: -0.55rem;
    transform: translate(-50%, 0.4rem);
    padding: 0.24rem 0.5rem;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.92);
    color: #fff;
    font-size: 0.72rem;
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    box-shadow: 0 12px 24px -18px rgba(15, 23, 42, 0.85);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
    z-index: 3;
}

.lessons-sidebar-link:hover .lessons-sidebar-link-label,
.lessons-sidebar-link:focus-visible .lessons-sidebar-link-label {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
}

.lessons-sidebar-status {
    display: grid;
    gap: 0.75rem;
}

.lessons-status-card {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
    padding: 0.95rem 1rem;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: #f8fafc;
}

.lessons-status-card .material-icons {
    color: var(--primary);
    margin-top: 0.1rem;
}

.lessons-status-card strong {
    display: block;
    color: var(--text-dark);
    margin-bottom: 0.2rem;
}

.lessons-eyebrow {
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.45rem;
}

.lessons-meta,
.lessons-subcopy,
.lessons-track-summary,
.lessons-track-more,
.lessons-guidance-item p,
.lessons-insight-card p,
.lessons-insight-featured p,
.lessons-featured-card p {
    color: var(--text-light);
}

.lessons-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.85fr);
    gap: 1rem;
    background: var(--app-soft-gradient);
}

.lessons-hero-copy h1 {
    font-size: clamp(2rem, 4vw, 2.85rem);
    line-height: 1.08;
    color: var(--primary-dark);
    margin-bottom: 0.8rem;
    letter-spacing: -0.03em;
}

.lessons-hero-stack {
    display: grid;
    gap: 0.85rem;
}

.lessons-mini-panel {
    border: 1px solid var(--border);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.88);
    padding: 1rem;
}

.lessons-mini-label {
    color: var(--text-light);
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.lessons-mini-value {
    color: var(--primary-dark);
    font-size: 1.6rem;
    font-weight: 700;
    margin: 0.35rem 0 0.45rem;
}

.lessons-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}

.lessons-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
    border: 1px solid transparent;
    cursor: pointer;
    font: inherit;
}

.lessons-btn:hover,
.lessons-btn:focus-visible {
    transform: translateY(-1px);
    outline: none;
}

.lessons-btn-primary {
    background: var(--primary);
    color: var(--light);
    box-shadow: 0 12px 24px -18px rgba(5, 150, 105, 0.55);
}

.lessons-btn-primary:hover,
.lessons-btn-primary:focus-visible {
    background: var(--primary-dark);
}

.lessons-btn-secondary {
    background: rgba(255, 255, 255, 0.92);
    color: var(--primary-dark);
    border-color: var(--border);
}

.lessons-btn-secondary:hover,
.lessons-btn-secondary:focus-visible {
    background: var(--primary-light);
}

.lessons-featured-grid,
.lessons-track-grid,
.lessons-support-grid {
    display: grid;
    gap: 1rem;
}

.lessons-section-heading {
    margin-bottom: 0.25rem;
}

.lessons-section-heading h2,
.lessons-catalog-section-header h3 {
    color: var(--text-dark);
    font-size: 1.55rem;
    margin-bottom: 0.25rem;
}

.lessons-featured-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.lessons-featured-card {
    display: grid;
    gap: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 1.15rem;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(247, 253, 249, 0.98) 100%);
}

.lessons-featured-icon,
.lessons-insight-icon,
.lessons-track-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(16, 185, 129, 0.12);
    color: var(--primary-dark);
}

.lessons-featured-track,
.lessons-track-domain,
.lessons-insight-category {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent);
}

.lessons-featured-card h3,
.lessons-track-card h4,
.lessons-guidance-item h3,
.lessons-insight-featured h3,
.lessons-insight-card h3 {
    color: var(--text-dark);
}

.lessons-featured-card h3 a,
.lessons-insight-featured h3 a,
.lessons-insight-card h3 a,
.lessons-track-links a {
    color: inherit;
    text-decoration: none;
}

.lessons-featured-card h3 a:hover,
.lessons-featured-card h3 a:focus-visible,
.lessons-insight-featured h3 a:hover,
.lessons-insight-featured h3 a:focus-visible,
.lessons-insight-card h3 a:hover,
.lessons-insight-card h3 a:focus-visible,
.lessons-track-links a:hover,
.lessons-track-links a:focus-visible,
.lessons-inline-link:hover,
.lessons-inline-link:focus-visible {
    color: var(--primary-dark);
    text-decoration: underline;
}

.lessons-inline-link {
    color: #166534;
    font-weight: 600;
    text-decoration: none;
}

.lessons-filter-toolbar {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.85rem;
    align-items: end;
}

.lessons-search-field {
    display: grid;
    gap: 0.4rem;
}

.lessons-search-field label {
    color: var(--text-dark);
    font-size: 0.92rem;
    font-weight: 600;
}

.lessons-search-input {
    width: 100%;
    min-height: 46px;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.85rem 0.95rem;
    font: inherit;
    color: var(--text-dark);
    background: #fff;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.lessons-search-input:focus {
    outline: none;
    border-color: #86efac;
    box-shadow: 0 0 0 4px rgba(134, 239, 172, 0.24);
}

.lessons-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.lessons-filter-chip {
    border: 1px solid var(--border);
    background: #f8fafc;
    color: var(--text-dark);
    border-radius: 999px;
    padding: 0.6rem 0.85rem;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.lessons-filter-chip:hover,
.lessons-filter-chip:focus-visible {
    background: var(--primary-light);
    border-color: #b7e4c7;
    color: var(--primary-dark);
    outline: none;
    transform: translateY(-1px);
}

.lessons-filter-chip-active {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: #fff;
}

.lessons-filter-chip-active:hover,
.lessons-filter-chip-active:focus-visible {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.lessons-results-label {
    color: var(--text-light);
    font-weight: 600;
}

.lessons-section-stack {
    display: grid;
    gap: 1.25rem;
}

.lessons-catalog-section {
    display: grid;
    gap: 1rem;
}

.lessons-catalog-section-header {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: flex-start;
}

.lessons-section-count,
.lessons-track-count,
.lessons-track-level {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 34px;
    padding: 0.4rem 0.75rem;
    border-radius: 999px;
    background: #ecfdf5;
    color: #166534;
    font-size: 0.82rem;
    font-weight: 700;
    white-space: nowrap;
}

.lessons-track-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.lessons-track-card {
    display: grid;
    gap: 0.85rem;
    padding: 1.1rem;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: #fff;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.lessons-track-card:hover {
    border-color: rgba(16, 185, 129, 0.26);
    box-shadow: 0 18px 34px -28px rgba(15, 23, 42, 0.34);
    transform: translateY(-2px);
}

.lessons-track-card-top {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 0.75rem;
    align-items: center;
}

.lessons-track-headings {
    min-width: 0;
}

.lessons-track-headings h4 {
    font-size: 1.1rem;
}

.lessons-track-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    align-items: center;
}

.lessons-track-links {
    display: grid;
    gap: 0.55rem;
    margin: 0;
    padding-left: 1.05rem;
}

.lessons-track-links li {
    color: var(--text-dark);
}

.lessons-support-strip {
    background: linear-gradient(180deg, rgba(251, 253, 252, 0.98) 0%, rgba(245, 250, 247, 0.98) 100%);
}

.lessons-support-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.lessons-support-card {
    display: grid;
    gap: 0.8rem;
    padding: 1rem 1.05rem;
    border: 1px solid rgba(148, 163, 184, 0.18);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.88);
}

.lessons-support-card-top {
    display: flex;
    gap: 0.8rem;
    align-items: flex-start;
}

.lessons-support-card h3 {
    color: var(--text-dark);
}

.lessons-support-card h3 a {
    color: inherit;
    text-decoration: none;
}

.lessons-support-card h3 a:hover,
.lessons-support-card h3 a:focus-visible {
    color: var(--primary-dark);
    text-decoration: underline;
}

.lessons-empty-state {
    display: grid;
    place-items: center;
    gap: 0.5rem;
    min-height: 220px;
    border: 1px dashed rgba(16, 185, 129, 0.22);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.68);
    text-align: center;
    padding: 1.5rem;
}

.lessons-empty-state .material-icons {
    font-size: 2.1rem;
    color: var(--primary);
}

[data-track-card][hidden],
[data-track-section][hidden] {
    display: none !important;
}

@media (max-width: 1180px) {
    .lessons-shell {
        width: min(1180px, calc(100% - 1.25rem));
        grid-template-columns: 1fr;
    }

    .lessons-sidebar {
        position: static;
    }
}

@media (max-width: 980px) {
    .lessons-hero,
    .lessons-featured-grid,
    .lessons-track-grid,
    .lessons-support-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .lessons-hero {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .lessons-filter-toolbar,
    .lessons-catalog-section-header,
    .lessons-track-card-top {
        grid-template-columns: 1fr;
    }

    .lessons-catalog-section-header {
        display: grid;
    }

    .lessons-track-card-top {
        display: grid;
    }

    .lessons-section-count,
    .lessons-track-count {
        justify-self: start;
    }
}

@media (max-width: 640px) {
    .lessons-shell {
        padding: 1.35rem 0 2rem;
    }

    .lessons-featured-grid,
    .lessons-track-grid,
    .lessons-support-grid {
        grid-template-columns: 1fr;
    }

    .lessons-sidebar-nav {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .lessons-hero-copy h1 {
        font-size: clamp(1.8rem, 7vw, 2.35rem);
    }

    .lessons-hero-actions {
        flex-direction: column;
    }

    .lessons-btn {
        width: 100%;
    }
}