.courses-page {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg) var(--space-3xl);
}

.courses-header {
    padding: var(--space-xl) 0 var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--space-xl);
}

.courses-header__title {
    font-size: 1.8rem;
    color: var(--color-green);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.courses-header__title::before {
    content: '> ';
    color: var(--color-green-dim);
}

.courses-header__desc {
    color: var(--color-gray);
    font-size: 0.85rem;
    margin-top: var(--space-xs);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-xl) var(--space-lg);
}

.course-card {
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.course-card__link {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.course-card:hover {
    border-color: var(--color-green-dim);
    transform: translateY(-2px);
}

.course-card__thumb {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: var(--color-bg-alt);
    overflow: hidden;
}

.course-card__thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.course-card:hover .course-card__thumb img {
    transform: scale(1.05);
}

.course-card__thumb-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0d1117 0%, #1a1f2e 100%);
    color: var(--color-green);
    font-size: 2.5rem;
}

.course-card__badges {
    position: absolute;
    top: var(--space-xs);
    left: var(--space-xs);
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

.course-card__lock {
    position: absolute;
    top: var(--space-xs);
    right: var(--space-xs);
    background-color: rgba(0, 0, 0, 0.7);
    color: var(--color-yellow);
    padding: 0.15em 0.5em;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-family: var(--font-mono);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: 3px;
}

.course-card__body {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    flex: 1;
}

.course-card__category {
    display: inline-block;
    font-size: 0.65rem;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-blue);
    margin-bottom: var(--space-xs);
}

.course-card__title {
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font-mono);
    line-height: 1.4;
    color: var(--color-white);
    margin-bottom: var(--space-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-card__title a {
    color: inherit;
    text-decoration: none;
}

.course-card:hover .course-card__title a {
    color: var(--color-green);
}

.course-card__excerpt {
    font-size: 0.8rem;
    color: var(--color-gray);
    line-height: 1.5;
    margin-bottom: var(--space-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.course-card__meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: 0.75rem;
    color: var(--color-gray-dark);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-border);
    flex-wrap: wrap;
}

.course-card__meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.course-card__meta-item svg {
    width: 14px;
    height: 14px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}

.course-card__cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    margin-top: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-sm);
    text-decoration: none;
    text-align: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.course-card__cta--free {
    background-color: var(--color-green);
    color: var(--color-bg);
    border: 1px solid var(--color-green);
}

.course-card__cta--free:hover {
    background-color: var(--color-green-dim);
    border-color: var(--color-green-dim);
}

.course-card__cta--locked {
    background-color: transparent;
    color: var(--color-yellow);
    border: 1px solid var(--color-yellow);
}

.course-card__cta--locked:hover {
    background-color: var(--color-yellow);
    color: var(--color-bg);
}

.course-detail {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg) var(--space-3xl);
}

.course-detail__header {
    padding: var(--space-xl) 0;
    margin-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

.course-detail__badges {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    flex-wrap: wrap;
    align-items: center;
}

.course-detail__title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-white);
    margin: 0 0 var(--space-md);
    line-height: 1.3;
}

.course-detail__subtitle {
    color: var(--color-gray);
    font-size: 0.95rem;
    margin-bottom: var(--space-md);
    max-width: 700px;
}

.course-detail__stats {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
    font-size: 0.8rem;
    color: var(--color-gray);
}

.course-detail__stat {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.course-detail__stat svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}

.course-detail__layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

@media (min-width: 1024px) {
    .course-detail__layout {
        grid-template-columns: 1fr 380px;
    }
}

.course-detail__main {
    min-width: 0;
}

.course-detail__sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.course-content-section {
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--space-xl);
}

.course-content-section__title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-white);
    margin: 0 0 var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.course-content-section__title::before {
    content: '> ';
    color: var(--color-green-dim);
}

.course-learn-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.course-learn-list li {
    position: relative;
    padding-left: var(--space-lg);
    margin-bottom: var(--space-sm);
    font-size: 0.85rem;
    color: var(--color-white);
    line-height: 1.5;
}

.course-learn-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-green);
    font-weight: bold;
    font-size: 0.85rem;
}

.course-requirements-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.course-requirements-list li {
    position: relative;
    padding-left: var(--space-lg);
    margin-bottom: var(--space-sm);
    font-size: 0.85rem;
    color: var(--color-gray);
    line-height: 1.5;
}

.course-requirements-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--color-gray-dark);
}

.course-lessons {
    margin-bottom: var(--space-xl);
}

.course-lessons__title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-white);
    margin: 0 0 var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.course-lessons__title::before {
    content: '> ';
    color: var(--color-green-dim);
}

.course-lesson-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.85rem;
    color: var(--color-white);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.course-lesson-item:last-child {
    border-bottom: none;
}

.course-lesson-item:hover {
    color: var(--color-green);
}

.course-lesson-item--locked {
    color: var(--color-gray-dark);
}

.course-lesson-item--locked:hover {
    color: var(--color-gray);
}

.course-lesson-item__number {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: var(--color-green-dark);
    color: var(--color-green);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    flex-shrink: 0;
}

.course-lesson-item--locked .course-lesson-item__number {
    background-color: var(--color-bg-alt);
    color: var(--color-gray-dark);
    border: 1px solid var(--color-border);
}

.course-lesson-item__info {
    flex: 1;
    min-width: 0;
}

.course-lesson-item__title {
    font-weight: 500;
    line-height: 1.3;
}

.course-lesson-item__duration {
    font-size: 0.7rem;
    color: var(--color-gray-dark);
    font-family: var(--font-mono);
}

.course-lesson-item__lock-icon {
    flex-shrink: 0;
    color: var(--color-yellow);
}

.course-lesson-item__lock-icon svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}

.course-sidebar-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.course-sidebar-card__img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    background-color: var(--color-bg-alt);
}

.course-sidebar-card__body {
    padding: var(--space-lg);
}

.course-sidebar-card__price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-green);
    font-family: var(--font-mono);
    margin-bottom: var(--space-md);
}

.course-sidebar-card__cta {
    display: block;
    width: 100%;
    padding: var(--space-md);
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-sm);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: var(--space-md);
}

.course-sidebar-card__cta--free {
    background-color: var(--color-green);
    color: var(--color-bg);
    border: 1px solid var(--color-green);
}

.course-sidebar-card__cta--free:hover {
    background-color: var(--color-green-dim);
}

.course-sidebar-card__cta--locked {
    background-color: transparent;
    color: var(--color-yellow);
    border: 1px solid var(--color-yellow);
}

.course-sidebar-card__cta--locked:hover {
    background-color: var(--color-yellow);
    color: var(--color-bg);
}

.course-sidebar-card__meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    font-size: 0.8rem;
    color: var(--color-gray);
}

.course-sidebar-card__meta-row {
    display: flex;
    justify-content: space-between;
    padding: var(--space-xs) 0;
    border-bottom: 1px solid var(--color-border);
}

.course-sidebar-card__meta-row:last-child {
    border-bottom: none;
}

.course-sidebar-card__meta-label {
    color: var(--color-gray-dark);
}

.course-sidebar-card__meta-value {
    color: var(--color-white);
    font-weight: 500;
}

.course-restricted-notice {
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-yellow);
    border-radius: var(--radius-md);
    padding: var(--space-xl);
    text-align: center;
    margin-top: var(--space-lg);
}

.course-restricted-notice__icon {
    color: var(--color-yellow);
    margin-bottom: var(--space-md);
}

.course-restricted-notice__icon svg {
    width: 48px;
    height: 48px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.5;
}

.course-restricted-notice__title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--space-sm);
}

.course-restricted-notice__text {
    color: var(--color-gray);
    font-size: 0.85rem;
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.course-restricted-notice__cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    background-color: var(--color-green);
    color: var(--color-bg);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: background-color var(--transition-fast);
}

.course-restricted-notice__cta:hover {
    background-color: var(--color-green-dim);
}

.courses-empty {
    text-align: center;
    padding: var(--space-3xl) 0;
    color: var(--color-gray);
    font-size: 1.1rem;
    font-family: var(--font-mono);
}

/* Lesson page */
.lesson-page {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-lg);
}

.lesson-breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-xs);
    font-size: 0.8rem;
    color: var(--color-gray-dark);
    margin-bottom: var(--space-xl);
    font-family: var(--font-mono);
}

.lesson-breadcrumb a {
    color: var(--color-gray);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.lesson-breadcrumb a:hover {
    color: var(--color-green);
}

.lesson-breadcrumb__sep {
    color: var(--color-border-light);
}

.lesson-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

@media (min-width: 1024px) {
    .lesson-layout {
        grid-template-columns: 1fr 360px;
    }

    .lesson-sidebar {
        position: sticky;
        top: 80px;
        align-self: start;
    }

    .lesson-sidebar__section {
        max-height: calc(100vh - 120px);
    }
}

.lesson-main {
    min-width: 0;
}

.lesson-player {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    background-color: var(--color-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--space-xl);
}

.lesson-player iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.lesson-player--link {
    padding-bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.lesson-header {
    margin-bottom: var(--space-xl);
}

.lesson-header__course {
    display: inline-block;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-blue);
    margin-bottom: var(--space-xs);
}

.lesson-header__course a {
    color: inherit;
    text-decoration: none;
}

.lesson-header__course a:hover {
    color: var(--color-green);
}

.lesson-header__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white);
    margin: 0 0 var(--space-sm);
    line-height: 1.3;
}

.lesson-header__meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: 0.8rem;
    color: var(--color-gray);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.lesson-header__number {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--color-green);
}

.lesson-header__duration {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.lesson-header__duration svg {
    width: 14px;
    height: 14px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}

.lesson-content {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--color-white);
    margin-bottom: var(--space-2xl);
}

.lesson-content h2,
.lesson-content h3,
.lesson-content h4 {
    color: var(--color-green);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-sm);
}

.lesson-content img {
    border-radius: var(--radius-md);
    max-width: 100%;
}

.lesson-content pre,
.lesson-content code {
    font-family: var(--font-mono);
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}

.lesson-content pre {
    padding: var(--space-md);
    overflow-x: auto;
}

.lesson-content code {
    padding: 0.1em 0.4em;
    font-size: 0.85em;
}

.lesson-content a {
    color: var(--color-blue);
    text-decoration: none;
}

.lesson-content a:hover {
    color: var(--color-green);
}

.lesson-content blockquote {
    border-left: 3px solid var(--color-green);
    margin: var(--space-lg) 0;
    padding: var(--space-sm) var(--space-md);
    color: var(--color-gray);
    background-color: var(--color-bg-alt);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.lesson-content ul,
.lesson-content ol {
    margin: var(--space-md) 0;
    padding-left: var(--space-xl);
}

.lesson-content li {
    margin-bottom: var(--space-xs);
}

.lesson-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.lesson-nav__link {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.lesson-nav__link:hover {
    border-color: var(--color-green-dim);
    background-color: var(--color-bg-hover);
}

.lesson-nav__link--prev {
    align-items: flex-start;
}

.lesson-nav__link--next {
    align-items: flex-end;
    text-align: right;
}

.lesson-nav__link--disabled {
    visibility: hidden;
}

.lesson-nav__link span {
    font-size: 0.7rem;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-dark);
}

.lesson-nav__link strong {
    font-size: 0.85rem;
    color: var(--color-white);
    line-height: 1.3;
}

.lesson-nav__link:hover strong {
    color: var(--color-green);
}

.lesson-nav__link svg {
    flex-shrink: 0;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}

.lesson-restricted {
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
}

.lesson-restricted__icon {
    color: var(--color-yellow);
    margin-bottom: var(--space-lg);
}

.lesson-restricted__icon svg {
    stroke: currentColor;
    fill: none;
    stroke-width: 1.5;
}

.lesson-restricted__title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--space-sm);
}

.lesson-restricted__text {
    color: var(--color-gray);
    font-size: 0.9rem;
    margin-bottom: var(--space-lg);
    line-height: 1.6;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.lesson-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.lesson-sidebar__section {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.lesson-sidebar__title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-white);
    margin: 0;
    padding: var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    background-color: var(--color-bg-card);
    flex-shrink: 0;
}

.lesson-sidebar__title-left {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.lesson-sidebar__title svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    color: var(--color-green);
}

.lesson-sidebar__count {
    font-size: 0.65rem;
    font-family: var(--font-mono);
    color: var(--color-gray-dark);
    background-color: var(--color-bg-alt);
    padding: 0.1em 0.5em;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    white-space: nowrap;
}

.lesson-sidebar__progress {
    height: 3px;
    background-color: var(--color-border);
    flex-shrink: 0;
}

.lesson-sidebar__progress-bar {
    height: 100%;
    background-color: var(--color-green);
    transition: width var(--transition-normal);
}

.lesson-sidebar__lessons {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.lesson-sidebar__lessons::-webkit-scrollbar {
    width: 4px;
}

.lesson-sidebar__lessons::-webkit-scrollbar-track {
    background: transparent;
}

.lesson-sidebar__lessons::-webkit-scrollbar-thumb {
    background-color: var(--color-border-light);
    border-radius: var(--radius-sm);
}

.lesson-sidebar__lessons::-webkit-scrollbar-thumb:hover {
    background-color: var(--color-gray-dark);
}

.lesson-sidebar__item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.78rem;
    color: var(--color-gray);
    text-decoration: none;
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.lesson-sidebar__item:last-child {
    border-bottom: none;
}

.lesson-sidebar__item:hover {
    background-color: var(--color-bg-hover);
    color: var(--color-white);
}

.lesson-sidebar__item--active {
    background-color: var(--color-green-dark);
    color: var(--color-green);
}

.lesson-sidebar__number {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: var(--color-bg-alt);
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 600;
    border: 1px solid var(--color-border);
}

.lesson-sidebar__item--active .lesson-sidebar__number {
    background-color: var(--color-green);
    color: var(--color-bg);
    border-color: var(--color-green);
}

.lesson-sidebar__name {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    line-height: 1.3;
}

.lesson-sidebar__duration {
    flex-shrink: 0;
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--color-gray-dark);
}

.lesson-sidebar__back {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--color-gray);
    text-decoration: none;
    border-top: 1px solid var(--color-border);
    flex-shrink: 0;
    transition: color var(--transition-fast);
}

.lesson-sidebar__back:hover {
    color: var(--color-green);
}

.lesson-sidebar__back svg {
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}

@media (max-width: 1023px) {
    .lesson-layout {
        grid-template-columns: 1fr;
    }

    .lesson-sidebar {
        order: -1;
    }

    .lesson-sidebar__section {
        max-height: none;
    }

    .lesson-sidebar__lessons {
        max-height: 40vh;
    }

    .lesson-header__title {
        font-size: 1.25rem;
    }
}

@media (max-width: 640px) {
    .lesson-nav {
        grid-template-columns: 1fr;
    }

    .lesson-nav__link--disabled {
        display: none;
    }
}

@media (max-width: 1024px) {
    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 640px) {
    .courses-grid {
        grid-template-columns: 1fr;
    }

    .course-detail__title {
        font-size: 1.5rem;
    }

    .course-detail__stats {
        gap: var(--space-md);
    }

    .course-sidebar-card__body {
        padding: var(--space-md);
    }
}