/* Course player — scroll shell + Tree + Search sidebar (production) */

body.course-player-page {
    --site-navbar-h: 56px;
    --site-footer-h: 0;
}

/* Immersive learning mode: hide site chrome, full viewport */
body.course-player-page--immersive {
    --site-navbar-h: 0;
}

body.course-player-page--immersive .site-navbar {
    display: none !important;
}

body.course-player-page--immersive .course-player-shell--immersive {
    flex: 1 1 0%;
    min-height: 0;
}

body.course-player-page.student-cabinet-page .course-player-shell--in-cabinet {
    flex: 1 1 0%;
    min-height: 0;
    max-height: none;
}

body.course-player-page.student-cabinet-page .course-player-body {
    background: #fff;
}

body.course-player-page .wrapper {
    min-height: 100dvh;
    max-height: 100dvh;
    overflow: hidden;
    width: 100%;
    max-width: 100%;
}

body.course-player-page main.flex-grow-1 {
    display: flex;
    flex-direction: column;
    flex: 1 1 0%;
    min-height: 0;
    overflow: hidden;
}

.course-player-topbar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
    min-height: 36px;
    padding: 0.2rem 0.75rem;
    background: #fff;
    border-bottom: 1px solid rgba(15, 23, 42, 0.08);
    color: #0f172a;
}

.course-player-topbar__back {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    flex-shrink: 0;
    padding: 0.25rem 0.5rem;
    border-radius: 0.375rem;
    color: #334155;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
}

.course-player-topbar__back:hover,
.course-player-topbar__back:focus-visible {
    color: var(--egeok-accent, #049622);
    background: rgba(4, 150, 34, 0.08);
    outline: none;
}

.course-player-topbar__title {
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.35rem;
    font-size: 0.8125rem;
    line-height: 1.3;
    color: #475569;
}

.course-player-topbar__course {
    font-weight: 600;
    color: #0f172a;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: min(42vw, 28rem);
}

.course-player-topbar__sep {
    color: #94a3b8;
}

.course-player-topbar__lesson {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: min(36vw, 22rem);
    color: #334155;
}

.course-player-topbar__toc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 2rem;
    height: 2rem;
    padding: 0;
    border: 1px solid #cbd5e1;
    border-radius: 0.375rem;
    background: #fff;
    color: #334155;
    font-size: 1.05rem;
    line-height: 1;
    cursor: pointer;
}

.course-player-topbar__toc-btn:hover,
.course-player-topbar__toc-btn:focus-visible {
    border-color: var(--egeok-accent, #049622);
    color: var(--egeok-accent, #049622);
    outline: none;
}

.course-player-topbar__toc-btn[aria-expanded="false"] {
    background: rgba(4, 150, 34, 0.08);
    border-color: rgba(4, 150, 34, 0.45);
}

@media (max-width: 575.98px) {
    .course-player-topbar__lesson,
    .course-player-topbar__sep {
        display: none;
    }
}

.course-player-teacher-preview-banner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: #fff7ed;
    border-bottom: 1px solid #fed7aa;
    color: #9a3412;
    font-size: 0.875rem;
}

.course-player-teacher-preview-banner__text {
    flex: 1 1 auto;
}

.course-player-teacher-preview-banner__back {
    flex-shrink: 0;
}

.course-player-shell {
    flex: 1 1 0%;
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    width: 100%;
}

.course-player {
    flex: 1 1 0%;
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    background: #fff;
}

.course-player-body {
    display: flex;
    flex-direction: column;
    flex: 1 1 0%;
    width: 100%;
    max-width: 100%;
    min-height: 0;
    min-width: 0;
    height: 0;
    overflow: hidden;
    position: relative;
    background: #f3f4f6;
}

.course-player-layout {
    display: flex;
    flex: 1 1 0%;
    width: 100%;
    max-width: 100%;
    min-height: 0;
    min-width: 0;
    height: 0;
    overflow: hidden;
    background: #fff;
}

.course-player-main {
    flex: 1 1 0%;
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    overflow: hidden;
    background: #fff;
}

.course-player-stage {
    display: flex;
    flex-direction: column;
    flex: 1 1 0%;
    min-height: 0;
    min-width: 0;
    width: 100%;
    overflow: hidden;
    background: #fff;
}

.course-player-header {
    box-sizing: border-box;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    height: 50px;
    min-height: 50px;
    padding: 12px 1rem;
    overflow: visible;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: #222;
}

.course-player-header:has(.course-player-header__back) {
    height: auto;
    min-height: 50px;
}

.course-player-header .course-player-back {
    color: #e2e8f0;
}

.course-player-header .course-player-back:hover {
    color: #86efac;
}

.course-player-header__back {
    margin-bottom: 0.5rem;
}

.course-player-header__chrome {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    min-width: 0;
    width: 100%;
}

.course-player-header__chrome .course-player-step-nav {
    flex: 1 1 auto;
    min-width: 0;
}

.course-player-header__chrome .course-player-step-bar {
    align-items: center;
    width: 100%;
    min-height: 50px;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0 8px;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.45) transparent;
}

.course-player-header__toc {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 2rem;
    height: 26px;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 0.375rem;
    background: transparent;
    color: #e2e8f0;
    font-size: 1.1rem;
    line-height: 1;
    cursor: pointer;
}

.course-player-header__toc:hover,
.course-player-header__toc:focus-visible {
    border-color: #86efac;
    color: #86efac;
    outline: none;
}

.course-player-breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.35rem;
    padding: 0.5rem 1.5rem 0;
    font-size: 0.75rem;
    color: #64748b;
    background: #fff;
    flex-shrink: 0;
}

.course-player-breadcrumb__list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.course-player-breadcrumb__item {
    display: inline-flex;
    align-items: center;
}

.course-player-breadcrumb__link {
    color: #2563eb;
    text-decoration: none;
}

.course-player-breadcrumb__link:hover {
    text-decoration: underline;
    color: #1d4ed8;
}

.course-player-breadcrumb__current {
    color: #334155;
    font-weight: 600;
}

.course-player-breadcrumb__text {
    color: #475569;
}

.course-player-breadcrumb__sep {
    color: #94a3b8;
    user-select: none;
}

.course-player-breadcrumb__lesson {
    color: #334155;
    font-weight: 600;
}

.course-player-back {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: #334155;
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
    font-size: 0.875rem;
}

.course-player-back:hover {
    color: var(--egeok-accent, #049622);
}

.course-player-lesson-title {
    font-size: 1.0625rem;
    font-weight: 600;
    margin: 0;
    color: #0f172a;
    line-height: 1.35;
}

.course-player-step-bar {
    display: flex;
    flex-wrap: nowrap;
    justify-content: flex-start;
    align-items: flex-start;
    gap: 4px;
    margin: 0;
    padding: 0;
    overflow: visible;
}

.course-step-square {
    box-sizing: border-box;
    appearance: none;
    -webkit-appearance: none;
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    margin: 0;
    border: 0;
    border-radius: 3px;
    font-size: 0.8rem;
    text-decoration: none;
    color: rgba(0, 0, 0, 0.5);
    background: #5e5e5e;
    transition: background-color 0.15s ease;
}

.course-step-square:hover {
    background: #6e6e6e;
    color: rgba(0, 0, 0, 0.55);
}

.course-step-square.is-completed {
    background: var(--egeok-accent, #049622);
    color: rgba(0, 0, 0, 0.5);
}

.course-step-square.is-completed:hover {
    background: var(--egeok-accent-hover, #037a1b);
    color: rgba(0, 0, 0, 0.5);
}

.course-step-square.is-current {
    position: relative;
    overflow: visible;
    z-index: 1;
    background: #5e5e5e;
    box-shadow: 0 0 0 1px #fff, inset 0 0 0 1px #fff;
}

.course-step-square.is-current.is-completed {
    background: var(--egeok-accent, #049622);
}

.course-step-square.is-current:hover {
    background: #6e6e6e;
    box-shadow: 0 0 0 1px #fff, inset 0 0 0 1px #fff;
}

.course-step-square.is-current.is-completed:hover {
    background: var(--egeok-accent-hover, #037a1b);
}

.course-step-square.is-problem,
.course-step-square.is-current.is-problem {
    background: #dc2626;
    color: rgba(0, 0, 0, 0.5);
}

.course-step-square.is-problem:hover,
.course-step-square.is-current.is-problem:hover {
    background: #b91c1c;
    color: rgba(0, 0, 0, 0.5);
}

.course-step-square.is-current.is-problem,
.course-step-square.is-current.is-problem:hover {
    box-shadow: 0 0 0 1px #fff, inset 0 0 0 1px #fff;
}

.course-step-pin-glyph {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.course-step-pin-icon {
    display: block;
    width: 18px;
    height: 18px;
}

.course-player-content {
    flex: 1 1 0%;
    min-height: 0;
    height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    background: #fff;
    padding: 1rem 1.25rem 1.25rem;
    scrollbar-width: thin;
    scrollbar-color: rgba(15, 23, 42, 0.35) rgba(15, 23, 42, 0.08);
}

.course-player-content::-webkit-scrollbar {
    width: 8px;
}

.course-player-content::-webkit-scrollbar-track {
    background: rgba(15, 23, 42, 0.06);
    border-radius: 4px;
}

.course-player-content::-webkit-scrollbar-thumb {
    background: rgba(15, 23, 42, 0.28);
    border-radius: 4px;
}

.course-player-content::-webkit-scrollbar-thumb:hover {
    background: rgba(15, 23, 42, 0.4);
}

.step-content {
    width: 100%;
    max-width: 1022px;
    margin-inline: auto;
}

.course-player-content figure.image {
    max-width: 100%;
    box-sizing: border-box;
}

.course-player-content figure.image.image_resized {
    max-width: 100%;
}

.course-player-content figure.image img,
.course-player-content .step-text-content img,
.course-player-content .step-task-condition img,
.course-player-content .step-file-intro img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Rich content (TipTap course steps) */
.course-player-content,
.step-preview__content {
    --egeok-inline-code-bg: #f6f8fa;
    --egeok-inline-code-color: #cf222e;
    --egeok-inline-code-border: transparent;
    --egeok-code-block-bg: #eef1f5;
    --egeok-code-block-border: #d8dee4;
}

.course-player-content h2,
.step-preview__content h2 {
    margin: 0.83em 0;
    font-size: 1.75em;
    font-weight: 700;
    line-height: 1.25;
}

.course-player-content h3,
.step-preview__content h3 {
    margin: 1em 0;
    font-size: 1.4em;
    font-weight: 700;
    line-height: 1.25;
}

.course-player-content h4,
.step-preview__content h4 {
    margin: 1em 0;
    font-size: 1.35em;
    font-weight: 700;
    line-height: 1.25;
}

.course-player-content ul,
.step-preview__content ul {
    list-style-type: disc;
    margin: 0.75em 0;
    padding-left: 2.5em;
}

.course-player-content ol,
.step-preview__content ol {
    list-style-type: decimal;
    margin: 0.75em 0;
    padding-left: 2.5em;
}

.course-player-content li,
.step-preview__content li {
    display: list-item;
    margin: 0.25em 0;
}

.course-player-content hr,
.step-preview__content hr {
    border: 0;
    border-top: 1px solid #e2e8f0;
    margin: 1.5rem 0;
}

.course-player-content blockquote,
.step-preview__content blockquote {
    border-left: 4px solid var(--egeok-accent, #049622);
    padding: 0.75rem 1rem;
    margin: 1rem 0;
    font-style: italic;
    color: #64748b;
    background: #f8fafc;
    border-radius: 0 0.375rem 0.375rem 0;
}

.course-player-content table,
.course-player-content figure.table table,
.step-preview__content table,
.step-preview__content figure.table table {
    width: auto;
    max-width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    background: #fff;
    border-radius: 0.375rem;
    overflow: hidden;
    box-shadow: 0 1px 4px rgba(15, 23, 42, 0.08);
}

.course-player-content figure.table,
.step-preview__content figure.table {
    margin: 1rem 0;
    max-width: 100%;
}

.course-player-content table.egeok-table-width-auto,
.course-player-content figure.table table.egeok-table-width-auto,
.step-preview__content table.egeok-table-width-auto,
.step-preview__content figure.table table.egeok-table-width-auto {
    width: auto;
    max-width: 100%;
}

.course-player-content table.egeok-table-width-50,
.course-player-content figure.table table.egeok-table-width-50,
.step-preview__content table.egeok-table-width-50,
.step-preview__content figure.table table.egeok-table-width-50 {
    width: 50%;
    max-width: 100%;
}

.course-player-content table.egeok-table-width-75,
.course-player-content figure.table table.egeok-table-width-75,
.step-preview__content table.egeok-table-width-75,
.step-preview__content figure.table table.egeok-table-width-75 {
    width: 75%;
    max-width: 100%;
}

.course-player-content table.egeok-table-width-100,
.course-player-content figure.table table.egeok-table-width-100,
.step-preview__content table.egeok-table-width-100,
.step-preview__content figure.table table.egeok-table-width-100 {
    width: 100%;
    max-width: 100%;
}

.course-player-content table.egeok-table-align-left,
.course-player-content figure.table table.egeok-table-align-left,
.step-preview__content table.egeok-table-align-left,
.step-preview__content figure.table table.egeok-table-align-left {
    margin-left: 0;
    margin-right: auto;
}

.course-player-content table.egeok-table-align-center,
.course-player-content figure.table table.egeok-table-align-center,
.step-preview__content table.egeok-table-align-center,
.step-preview__content figure.table table.egeok-table-align-center {
    margin-left: auto;
    margin-right: auto;
}

.course-player-content table.egeok-table-align-right,
.course-player-content figure.table table.egeok-table-align-right,
.step-preview__content table.egeok-table-align-right,
.step-preview__content figure.table table.egeok-table-align-right {
    margin-left: auto;
    margin-right: 0;
}

.course-player-content table.egeok-table-width-custom,
.course-player-content figure.table table.egeok-table-width-custom,
.step-preview__content table.egeok-table-width-custom,
.step-preview__content figure.table table.egeok-table-width-custom {
    max-width: 100%;
}

.course-player-content th,
.course-player-content td,
.step-preview__content th,
.step-preview__content td {
    padding: 0.625rem 0.875rem;
    text-align: left;
    border: 1px solid #e2e8f0;
}

.course-player-content th,
.step-preview__content th {
    background: #f8fafc;
    font-weight: 600;
    color: #0f172a;
}

.course-player-content figure.image-style-align-center:not([class*="egeok-figure-width-"]),
.course-player-content figure.image.image-style-align-center:not([class*="egeok-figure-width-"]),
.step-preview__content figure.image-style-align-center:not([class*="egeok-figure-width-"]),
.step-preview__content figure.image.image-style-align-center:not([class*="egeok-figure-width-"]) {
    float: none;
    display: block;
    width: fit-content;
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.course-player-content figure.image.image-style-align-center img,
.step-preview__content figure.image.image-style-align-center img {
    margin-left: auto;
    margin-right: auto;
}

.course-player-content figure.image.image-style-align-left:not([class*="egeok-figure-width-"]),
.step-preview__content figure.image.image-style-align-left:not([class*="egeok-figure-width-"]) {
    float: left;
    margin: 0 1rem 0.75rem 0;
    max-width: 50%;
}

.course-player-content figure.image.image-style-align-right:not([class*="egeok-figure-width-"]),
.step-preview__content figure.image.image-style-align-right:not([class*="egeok-figure-width-"]) {
    float: right;
    margin: 0 0 0.75rem 1rem;
    max-width: 50%;
}

.course-player-content figure.image.image-style-align-right img,
.step-preview__content figure.image.image-style-align-right img {
    margin-left: auto;
    margin-right: 0;
}

.course-player-content code.egeok-inline-code,
.step-preview__content code.egeok-inline-code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 85%;
    padding: 0.2em 0.4em;
    border-radius: 6px;
    background: var(--egeok-inline-code-bg);
    color: var(--egeok-inline-code-color);
    border: 0;
}

.course-player-content code.egeok-inline-code strong,
.course-player-content code.egeok-inline-code em,
.step-preview__content code.egeok-inline-code strong,
.step-preview__content code.egeok-inline-code em {
    font-family: inherit;
    color: inherit;
}

.course-player-content pre,
.step-preview__content pre {
    margin: 1rem 0;
    border-radius: 0.375rem;
    overflow-x: auto;
}

.course-player-content pre > code,
.step-preview__content pre > code {
    display: block;
    padding: 0.875rem 1rem;
    background: var(--egeok-code-block-bg, #eef1f5);
    border: 1px solid var(--egeok-code-block-border, #d8dee4);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    line-height: 1.5;
}

.course-player-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    padding: 0.55rem max(1.25rem, calc((100% - 1022px) / 2));
    border-top: 1px solid rgba(15, 23, 42, 0.08);
    background: #f8fafc;
    gap: 0.75rem;
}

.course-player-footer-actions {
    margin-left: auto;
}

/* CTA в плеере: зелёный акцент (глобальный .btn-primary — тёмно-серый #333) */
.course-player .btn.btn-primary.course-player-cta,
.course-player-footer .btn.btn-primary.course-player-cta {
    --bs-btn-bg: var(--egeok-accent, #049622);
    --bs-btn-border-color: var(--egeok-accent, #049622);
    --bs-btn-hover-bg: var(--egeok-accent-hover, #037a1b);
    --bs-btn-hover-border-color: var(--egeok-accent-hover, #037a1b);
    --bs-btn-active-bg: var(--egeok-accent-hover, #037a1b);
    --bs-btn-active-border-color: var(--egeok-accent-hover, #037a1b);
    --bs-btn-disabled-bg: rgba(4, 150, 34, 0.45);
    --bs-btn-disabled-border-color: rgba(4, 150, 34, 0.55);
    --bs-btn-disabled-color: #fff;
    border-color: var(--egeok-accent, #049622) !important;
    color: #fff !important;
    opacity: 1;
}

.course-player .btn.btn-primary.course-player-cta:disabled,
.course-player .btn.btn-primary.course-player-cta.disabled,
.course-player-footer .btn.btn-primary.course-player-cta:disabled,
.course-player-footer .btn.btn-primary.course-player-cta.disabled {
    background: rgba(4, 150, 34, 0.45) !important;
    background-color: rgba(4, 150, 34, 0.45) !important;
    border-color: rgba(4, 150, 34, 0.55) !important;
    color: #fff !important;
    box-shadow: none;
}

.course-player .btn.btn-primary.course-player-cta:not(:disabled):not(.disabled),
.course-player-footer .btn.btn-primary.course-player-cta:not(:disabled):not(.disabled) {
    background: var(--egeok-accent, #049622) !important;
    background-color: var(--egeok-accent, #049622) !important;
    border-color: var(--egeok-accent, #049622) !important;
}

.course-player .btn.btn-primary.course-player-cta:not(:disabled):not(.disabled):hover,
.course-player .btn.btn-primary.course-player-cta:not(:disabled):not(.disabled):focus,
.course-player-footer .btn.btn-primary.course-player-cta:not(:disabled):not(.disabled):hover,
.course-player-footer .btn.btn-primary.course-player-cta:not(:disabled):not(.disabled):focus {
    background: var(--egeok-accent-hover, #037a1b) !important;
    background-color: var(--egeok-accent-hover, #037a1b) !important;
    border-color: var(--egeok-accent-hover, #037a1b) !important;
    color: #fff !important;
}

.course-player .btn.btn-primary.course-player-cta:not(:disabled):not(.disabled):focus-visible,
.course-player-footer .btn.btn-primary.course-player-cta:not(:disabled):not(.disabled):focus-visible {
    box-shadow: 0 0 0 0.25rem rgba(4, 150, 34, 0.35);
}

/* --- Tree + Search sidebar --- */

.course-player-sidebar--tree {
    width: 280px;
    min-width: 220px;
    max-width: 400px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    min-height: 0;
    background: #fff;
    border-right: 1px solid rgba(15, 23, 42, 0.08);
    overflow: hidden;
    resize: horizontal;
    transition: width 0.18s ease, min-width 0.18s ease, opacity 0.15s ease, border-width 0.15s ease;
}

.course-player-layout--toc-collapsed .course-player-sidebar--tree {
    width: 0 !important;
    min-width: 0 !important;
    max-width: 0 !important;
    opacity: 0;
    border-right-width: 0;
    pointer-events: none;
    resize: none;
    overflow: hidden;
}

.course-sidebar-head__brand {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    margin-bottom: 0.65rem;
}

.course-sidebar-cover {
    display: block;
    border-radius: 0.5rem;
    object-fit: cover;
    background: #f1f5f9;
    flex-shrink: 0;
}

.course-sidebar-cover--lg {
    width: 48px;
    height: 48px;
}

.course-sidebar-cover--sm {
    width: 32px;
    height: 32px;
}

.course-sidebar-offcanvas-head {
    flex: 1 1 auto;
    min-width: 0;
}

.course-sidebar-head--tree {
    flex-shrink: 0;
    padding: 0.85rem 0.85rem 0.65rem;
    border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.course-sidebar-search {
    margin-top: 0.65rem;
    border-color: rgba(15, 23, 42, 0.12);
    font-size: 0.8125rem;
}

.course-sidebar-search:focus {
    border-color: var(--egeok-accent, #049622);
    box-shadow: 0 0 0 0.2rem rgba(4, 150, 34, 0.15);
}

.course-sidebar-nav--tree {
    flex: 1 1 0%;
    min-height: 0;
    height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 0.5rem 0.65rem 1rem;
    scrollbar-width: thin;
    scrollbar-color: rgba(15, 23, 42, 0.35) rgba(15, 23, 42, 0.08);
}

.course-sidebar-nav--tree::-webkit-scrollbar {
    width: 8px;
}

.course-sidebar-nav--tree::-webkit-scrollbar-track {
    background: rgba(15, 23, 42, 0.06);
    border-radius: 4px;
}

.course-sidebar-nav--tree::-webkit-scrollbar-thumb {
    background: rgba(15, 23, 42, 0.28);
    border-radius: 4px;
}

.course-sidebar-nav--tree::-webkit-scrollbar-thumb:hover {
    background: rgba(15, 23, 42, 0.4);
}

.course-sidebar-tree-label {
    margin: 0.55rem 0 0.25rem;
    padding: 0.35rem 0.4rem 0.15rem;
}

.course-sidebar-tree-label__text {
    display: block;
    font-size: var(--egeok-font-size-md, 0.875rem);
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: #64748b;
    line-height: 1.3;
    word-break: break-word;
}

.course-sidebar-tree-section {
    margin-bottom: 0.35rem;
    border-bottom: 1px solid rgba(15, 23, 42, 0.05);
    padding-bottom: 0.35rem;
}

.course-sidebar-tree-section:last-child {
    border-bottom: none;
}

.course-sidebar-tree-section__summary {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: #475569;
    cursor: pointer;
    padding: 0.45rem 0.4rem;
    border-radius: 0.375rem;
    list-style: none;
    line-height: 1.35;
    white-space: normal;
    word-break: break-word;
}

.course-sidebar-tree-section__cover {
    flex: 0 0 auto;
    width: 36px;
    height: 36px;
    border-radius: 0.375rem;
    object-fit: cover;
    background: #f1f5f9;
}

.course-sidebar-tree-section__label {
    flex: 1;
    min-width: 0;
}

.course-sidebar-tree-section__summary::-webkit-details-marker {
    display: none;
}

.course-sidebar-tree-section__summary::before {
    content: "▸";
    display: inline-block;
    margin-right: 0.35rem;
    color: #94a3b8;
    transition: transform 0.15s ease;
}

.course-sidebar-tree-section[open] > .course-sidebar-tree-section__summary::before {
    transform: rotate(90deg);
}

.course-sidebar-tree-section[open] > .course-sidebar-tree-section__summary {
    color: #0f172a;
    background: rgba(4, 150, 34, 0.05);
}

.course-sidebar-tree-section__lessons {
    padding: 0.15rem 0 0.25rem 1.75rem;
}

.course-sidebar-lesson--tree {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.4rem 0.45rem;
    margin-bottom: 0.1rem;
    color: #334155;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 400;
    border-radius: 0.375rem;
    transition: background-color 0.15s ease;
}

.course-sidebar-lesson--tree:hover {
    background: rgba(15, 23, 42, 0.04);
    color: #0f172a;
}

.course-sidebar-lesson--tree.is-active {
    background: rgba(4, 150, 34, 0.1);
    color: #0f172a;
}

.course-sidebar-lesson--tree.is-locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.course-sidebar-lesson__label {
    flex: 1 1 auto;
    min-width: 0;
    line-height: 1.3;
}

.course-sidebar-lesson__optional {
    display: block;
    margin-top: 0.1rem;
    font-size: 0.6875rem;
    font-weight: 600;
    line-height: 1.2;
    color: #055160;
}

.course-sidebar-lesson__meta {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    flex-shrink: 0;
}

.course-sidebar-lesson__check {
    flex-shrink: 0;
    color: var(--egeok-accent, #049622);
    font-size: 0.875rem;
}

.course-sidebar-lesson__lock {
    flex-shrink: 0;
    color: #94a3b8;
    font-size: 0.75rem;
}

.course-sidebar-offcanvas--tree {
    background: #fff;
    width: min(340px, 92vw);
}

.course-sidebar-head {
    flex-shrink: 0;
}

.course-sidebar-title {
    font-size: 0.9375rem;
    font-weight: 700;
    margin: 0 0 0.65rem;
    line-height: 1.35;
    color: #0f172a;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1 1 auto;
    min-width: 0;
}

.course-sidebar-head__brand .course-sidebar-title {
    margin-bottom: 0;
}

.course-sidebar-progress__track {
    height: 4px;
    background: rgba(15, 23, 42, 0.08);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 0.35rem;
}

.course-sidebar-progress__fill {
    height: 100%;
    background: var(--egeok-accent, #049622);
    border-radius: 999px;
    transition: width 0.25s ease;
}

.course-sidebar-progress__label {
    font-size: 0.75rem;
    color: #64748b;
}

.course-sidebar-progress__time {
    font-size: 0.75rem;
    line-height: 1.3;
}

/* Step content helpers */

.step-video-embed {
    background: #0f0f0f;
}

.step-video-embed iframe {
    border: 0;
    border-radius: 0.375rem;
}

.step-file-list .list-group-item {
    border-left: none;
    border-right: none;
}

.step-task-files {
    margin: -0.75rem 0 1.25rem;
    font-size: 0.95rem;
    color: #475569;
}

.step-task-files__label {
    margin-right: 0.25rem;
    color: #0f172a;
}

.step-task-files__link {
    margin-left: 0.65rem;
    font-weight: 600;
    text-decoration: none;
}

.step-task-files__link:hover,
.step-task-files__link:focus-visible {
    text-decoration: underline;
}

.step-task-card {
    border-color: #dee2e6 !important;
}

.course-player .step-task-card.is-incorrect,
.course-player .step-answer-card.is-incorrect {
    border-color: #f1aeb5 !important;
    box-shadow: 0 0 0 1px #f1aeb5;
}

.course-player .step-task-card.is-correct,
.course-player .step-answer-card.is-correct {
    border-color: #a3cfbb !important;
    box-shadow: 0 0 0 1px #a3cfbb;
}

.course-player .step-answer-card {
    border-color: #cbd5e1 !important;
    border-radius: 0.5rem;
    box-shadow: 0 4px 18px rgba(15, 23, 42, 0.12), 0 1px 3px rgba(15, 23, 42, 0.08);
    background: #fff;
}

.course-player .step-answer-card > .card-body {
    padding: 1.25rem 1.35rem;
}

.course-player .step-answer-prompt {
    margin: 0 0 0.75rem;
    font-size: 1rem;
    font-weight: 700;
    color: #0f172a;
    line-height: 1.35;
}

.course-player .step-task-actions--answer {
    justify-content: flex-start;
}

.course-player .step-answer-card .course-string-answer-input,
.course-player .step-answer-card .po-ege-answer-input--block,
.course-player .step-answer-card .fill-blank-input {
    width: 100%;
    max-width: none;
}

.step-feedback {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
}

.step-feedback.is-success {
    background: #d1e7dd;
    color: #0f5132;
}

.step-feedback.is-error {
    background: #f8d7da;
    color: #842029;
}

.step-form--locked .form-control {
    opacity: 0.92;
}

.step-form--locked .course-quiz-option .form-check-input:disabled {
    opacity: 1;
    border-color: #94a3b8;
    cursor: default;
}

.step-form--locked .course-quiz-option .form-check-input:disabled:checked {
    background-color: var(--egeok-accent, #049622);
    border-color: var(--egeok-accent, #049622);
}

.step-form--locked .course-quiz-option .form-check-input:disabled + .form-check-label {
    opacity: 1;
    cursor: default;
}

.step-form--locked .form-control[readonly] {
    background-color: #f8fafc;
    cursor: default;
}

.course-player .step-retry-control {
    flex: 0 0 auto;
    width: auto;
    min-height: 2rem;
    padding: 0.25rem 0.65rem;
    font-size: 0.8125rem;
    line-height: 1.3;
    white-space: nowrap;
}

.step-content .math-tex {
    font-family: inherit;
}

[data-rich-content] .katex,
[data-rich-content] .katex-display {
    font-size: 1.25em !important;
}

.step-text-content .step-video-embed {
    max-width: 1100px;
}

.step-video-block .step-video-embed {
    max-width: 1100px;
}

.step-video-fallback a {
    text-decoration: underline;
    text-underline-offset: 0.15em;
}

.step-text-content .step-video-embed iframe {
    width: 100%;
    height: 100%;
    border: 0;
}

.step-s3-video {
    max-width: 1100px;
    border-radius: 0.375rem;
    overflow: hidden;
    background: #0f0f0f;
}

.step-s3-video__el,
.step-s3-video .plyr {
    width: 100%;
    display: block;
}

.step-s3-video .plyr--video {
    --plyr-color-main: var(--egeok-accent, #049622);
    border-radius: 0.375rem;
}

.step-text-content .step-s3-video {
    max-width: 1100px;
}

.course-player--open .step-content details {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border: 1px solid #dee2e6;
    border-radius: 0.375rem;
}

.course-player--open .step-content details summary {
    cursor: pointer;
    font-weight: 600;
}

.course-player--open .step-content .b-test-work {
    margin: 1.25rem 0;
    padding: 1rem 1.25rem;
    border: 1px solid #dee2e6;
    border-radius: 0.5rem;
    background: #f8f9fa;
}

.course-player--open .step-content .b-test-work-description {
    margin-bottom: 0.75rem;
}

.course-player--open .step-content .b-test-work-description_strong {
    font-weight: 700;
}

.course-player--open .step-content .b-test-work-example {
    margin-bottom: 0.75rem;
}

.course-player--open .step-content .b-test-work-example img {
    display: block;
    max-width: 100%;
    height: auto;
}

.course-player--open .step-content .b-test-work > .ex {
    display: none;
}

.course-player--open .step-content .b-test-work .spacemath-solution {
    margin-top: 0.75rem;
    background: #fff;
}

.course-player--open .step-content .spacemath-solution:not([open]) > :not(summary) {
    display: none;
}

.course-player--open .step-content .spacemath-solution .decision-img {
    margin-top: 0.5rem;
    font-size: 1.05rem;
}

.course-player--open .step-content .spacemath-solution .decision-img span {
    font-weight: 600;
}

.course-player-step-pager {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    min-width: 0;
}

.course-player-step-pager__arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 44px;
    width: 44px;
    height: 44px;
    color: var(--egeok-accent, #049622);
    text-decoration: none;
    font-size: 1.25rem;
}

.course-player-step-pager__arrow.is-disabled {
    color: var(--egeok-color-text-muted, #94a3b8);
}

.course-player-step-pager__count {
    flex: 0 1 auto;
    border: 0;
    background: transparent;
    padding: 0.25rem 0.35rem;
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1.2;
    color: var(--egeok-color-text-primary, #0f172a);
    cursor: pointer;
}

.course-player-step-pager__count:focus-visible,
.course-player-step-pager__arrow:focus-visible {
    outline: 2px solid var(--egeok-color-focus-ring, var(--egeok-accent, #049622));
    outline-offset: 2px;
    border-radius: var(--egeok-radius-sm, 6px);
}

.course-player-step-pager__track {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 3px;
    background: var(--egeok-color-border-default, #e2e8f0);
    overflow: hidden;
}

.course-player-step-pager__fill {
    display: block;
    height: 100%;
    background: var(--egeok-accent, #049622);
}

.course-player-step-pager__mark {
    position: absolute;
    top: 0;
    width: 2px;
    height: 100%;
    margin-left: -1px;
    background: var(--egeok-accent-hover, #037a1b);
}

.course-player-step-sheet {
    height: auto;
    max-height: min(70vh, 28rem);
}

.course-player-step-sheet .offcanvas-body {
    padding-top: 0;
}

.course-player-step-sheet__row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-height: 48px;
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--egeok-color-text-primary, #0f172a);
    border-bottom: 1px solid var(--egeok-color-border-default, #e2e8f0);
}

.course-player-step-sheet__row.is-current {
    background: var(--egeok-color-accent-soft, #ecfdf5);
    font-weight: 600;
}

.course-player-step-sheet__num {
    flex: 0 0 1.5rem;
    font-variant-numeric: tabular-nums;
}

.course-player-step-sheet__type {
    flex: 1 1 auto;
}

.course-player-step-sheet__status {
    margin-left: auto;
    color: var(--egeok-accent, #049622);
}

.course-player-step-sheet__row.is-problem .course-player-step-sheet__status {
    color: var(--color-red-600, #dc2626);
}

.course-player-step-sheet__dot {
    display: block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: currentColor;
}

@media (max-width: 767.98px) {
    .course-player-header {
        position: relative;
        height: auto;
        min-height: 56px;
        padding: 0.25rem 0.5rem 3px;
        background: var(--egeok-color-bg-surface, #fff);
        border-bottom: 1px solid var(--egeok-color-border-default, #e2e8f0);
        overflow: hidden;
    }

    .course-player-header__chrome {
        align-items: center;
    }

    .course-player-topbar__toc-btn,
    .course-player-header__toc {
        display: none;
    }

    .course-player-header .course-player-back {
        color: var(--egeok-color-text-primary, #0f172a);
    }

    .course-player-step-nav {
        display: flex;
        flex-direction: column;
        min-width: 0;
    }

    .course-player-main {
        background: #fff;
    }

    .course-player-stage {
        max-width: none;
        box-shadow: none;
    }

    .course-player-breadcrumb {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .course-player-header {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .course-player-content {
        padding: 1rem;
    }

    .course-player-footer {
        padding: 0.65rem 1rem;
    }
}

@media (min-width: 768px) {
    .course-player-header:not(:has(.course-player-header__back)) {
        height: auto;
        min-height: 0;
        padding: 0;
    }

    body.course-player-page #site-messages {
        flex-shrink: 0;
    }

    .course-player-body {
        flex-direction: row;
        justify-content: center;
        align-items: stretch;
    }

    .course-player-layout {
        flex: 0 1 1600px;
        max-width: 1600px;
        width: 100%;
        height: auto;
        max-height: 100%;
        align-self: stretch;
        box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.06);
        border-top-left-radius: var(--egeok-radius-md, 10px);
        border-top-right-radius: var(--egeok-radius-md, 10px);
    }

    body.course-player-page.student-cabinet-page .course-player-body {
        justify-content: stretch;
    }

    body.course-player-page.student-cabinet-page .course-player-layout {
        flex: 1 1 auto;
        max-width: none;
        width: 100%;
        box-shadow: none;
    }

    body.course-player-page--immersive .course-player-body {
        justify-content: stretch;
        background: #fff;
    }

    body.course-player-page--immersive .course-player-layout {
        flex: 1 1 auto;
        max-width: none;
        width: 100%;
        box-shadow: none;
        border-radius: 0;
    }
}

/* Practice step — EGE-style answer fields */
.course-player .step-practice-bank-id {
    letter-spacing: 0.01em;
}

.course-player .step-practice-note {
    font-size: 0.95rem;
    line-height: 1.45;
}

.course-player .step-practice-note a {
    text-decoration: underline;
    font-weight: 500;
}

.course-player .step-practice-note p:last-child {
    margin-bottom: 0;
}

.course-player .course-string-answer-input {
    font-size: 1rem;
}

.course-player .step-practice-answer .po-ege-answer-fields {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.course-player .po-ege-answer-row {
    display: flex;
    gap: 0.5rem;
}

.course-player .po-ege-answer-input,
.course-player .po-ege-answer-input--table {
    width: 100%;
    max-width: 20rem;
    padding: 0.375rem 0.75rem;
    border: 1px solid #cbd5e1;
    border-radius: 0.375rem;
    font-size: 1rem;
}

.course-player .step-answer-card .po-ege-answer-input.po-ege-answer-input--block {
    max-width: none;
    box-sizing: border-box;
}

.course-player .po-ege-table-wrap {
    overflow-x: auto;
}

.course-player .po-ege-table-instruction {
    font-size: 0.875rem;
    color: #64748b;
    margin-bottom: 0.5rem;
}

.course-player .po-ege-answer-table {
    border-collapse: collapse;
}

.course-player .po-ege-answer-table td,
.course-player .po-ege-answer-table th {
    border: 1px solid #cbd5e1;
    padding: 0.25rem;
}

.course-player .po-ege-table-label {
    text-align: center;
    font-size: 0.8125rem;
    color: #64748b;
    min-width: 2rem;
}

.course-quiz-option .form-check-label {
    cursor: pointer;
}

.step-task-inline-feedback {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
    font-size: 0.9375rem;
    line-height: 1.4;
}

.step-task-inline-feedback .bi {
    flex: 0 0 auto;
    margin-top: 0.15rem;
}

.step-task-inline-feedback.is-success {
    background: #d1e7dd;
    color: #0f5132;
}

.step-task-inline-feedback.is-error {
    background: #f8d7da;
    color: #842029;
}

#btnQuizReset {
    min-height: 2.375rem;
}

.course-code-editor-surface {
    min-height: 220px;
    width: 100%;
    border: 1px solid #cbd5e1;
    border-radius: 0.375rem;
}

.course-code-editor.course-code-ide {
    min-height: 0;
    border: 1px solid var(--course-ide-border, #44475a);
    border-radius: 0.5rem;
    background: var(--course-ide-bg, #282a36);
}

.course-code-ide {
    --course-ide-bg: #282a36;
    --course-ide-chrome: #21222c;
    --course-ide-border: #44475a;
    --course-ide-fg: #f8f8f2;
    --course-ide-muted: #9aa0c7;
    --course-ide-h: clamp(480px, 50vh, 640px);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--course-ide-border);
    border-radius: 0.5rem;
    background: var(--course-ide-bg);
    color: var(--course-ide-fg);
}

.course-code-ide__toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem 0.75rem;
    flex: 0 0 auto;
    flex-wrap: wrap;
    padding: 0.45rem 0.65rem;
    background: var(--course-ide-chrome);
    border-bottom: 1px solid var(--course-ide-border);
}

.course-code-ide__meta {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    min-width: 0;
}

.course-code-ide__tab {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.65rem;
    border-radius: 0.25rem 0.25rem 0 0;
    background: var(--course-ide-bg);
    color: var(--course-ide-fg);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.8125rem;
    font-weight: 600;
    line-height: 1.3;
}

.course-code-ide .course-code-python-status {
    font-size: 0.75rem;
    color: var(--course-ide-muted);
    white-space: nowrap;
}

.course-code-ide .course-code-python-status[data-tone="ready"] {
    color: #50fa7b;
}

.course-code-ide .course-code-python-status[data-tone="error"] {
    color: #ff5555;
}

.course-code-ide .course-code-python-status[data-tone="loading"],
.course-code-ide .course-code-python-status[data-tone="muted"],
.course-code-ide .course-code-python-status[data-tone="running"] {
    color: var(--course-ide-muted);
}

.course-code-ide__actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
    margin: 0;
}

.course-code-ide .course-code-ide__actions > .btn,
.course-code-ide .course-code-ide__actions > .btn.btn-sm,
.course-code-ide .course-code-ide__actions > .btn:not(.btn-sm):not(.btn-lg),
.course-code-ide .course-code-ide__actions > .btn.course-player-cta,
.course-code-ide .course-code-ide__actions > .step-retry-control {
    box-sizing: border-box;
    height: 2.25rem;
    min-height: 2.25rem;
    max-height: 2.25rem;
    padding: 0 0.85rem;
    padding-top: 0;
    padding-bottom: 0;
    font-size: 0.8125rem;
    line-height: 1;
    border-radius: 0.375rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
}

.course-code-ide .videoconf-lesson-python-font {
    display: inline-flex;
    align-items: center;
    gap: 0.2rem;
}

.course-code-ide .videoconf-lesson-python-font .btn {
    width: 2.25rem;
    height: 2.25rem;
    min-height: 2.25rem;
    max-height: 2.25rem;
    padding: 0;
}

.course-code-ide .videoconf-lesson-python-font__size {
    min-width: 1.25rem;
    text-align: center;
    font-size: 0.75rem;
    color: var(--course-ide-muted, #9aa0c7);
}

.course-code-ide__actions .btn .bi {
    font-size: 1rem;
    line-height: 1;
}

.course-code-ide .btn.btn-success.course-code-ide__btn {
    --bs-btn-bg: var(--egeok-accent, #049622);
    --bs-btn-border-color: var(--egeok-accent, #049622);
    --bs-btn-hover-bg: var(--egeok-accent-hover, #037a1b);
    --bs-btn-hover-border-color: var(--egeok-accent-hover, #037a1b);
    background: var(--egeok-accent, #049622);
    border-color: var(--egeok-accent, #049622);
    color: #fff;
}

.course-code-ide .btn.btn-outline-light.course-code-ide__btn {
    color: var(--course-ide-fg);
    border-color: #6272a4;
}

.course-code-ide .course-code-ide__actions > #btnStartOver {
    --bs-btn-color: var(--course-ide-fg);
    --bs-btn-border-color: #6272a4;
    --bs-btn-hover-color: #fff;
    --bs-btn-hover-bg: #44475a;
    --bs-btn-hover-border-color: #6272a4;
    --bs-btn-active-color: #fff;
    --bs-btn-active-bg: #44475a;
    --bs-btn-active-border-color: #6272a4;
    color: var(--course-ide-fg);
    border-color: #6272a4;
}

.course-code-ide .step-retry-control {
    color: var(--course-ide-fg);
    border-color: #6272a4;
}

.course-code-ide__split-body {
    display: flex;
    flex-direction: column;
    height: var(--course-ide-h);
    min-height: 420px;
    min-width: 0;
}

.course-code-ide__editor-pane {
    flex: 1 1 75%;
    min-height: 160px;
    overflow: hidden;
    background: var(--course-ide-bg);
}

.course-code-ide .course-code-editor-surface,
.course-code-ide .ace_editor {
    width: 100%;
    height: 100%;
    min-height: 160px;
    border: 0;
    border-radius: 0;
    background: var(--course-ide-bg);
}

.course-code-ide__splitter,
.course-code-ide__height-handle {
    flex: 0 0 8px;
    width: 100%;
    border: 0;
    padding: 0;
    margin: 0;
    background: var(--course-ide-chrome);
    cursor: row-resize;
    touch-action: none;
    user-select: none;
}

.course-code-ide__splitter {
    border-top: 1px solid var(--course-ide-border);
    border-bottom: 1px solid var(--course-ide-border);
}

.course-code-ide__height-handle {
    border-top: 1px solid var(--course-ide-border);
}

.course-code-ide__splitter:hover,
.course-code-ide__height-handle:hover,
body.po-ide-dragging .course-code-ide__splitter,
body.po-ide-dragging .course-code-ide__height-handle {
    background: #6272a4;
}

body.po-ide-dragging {
    cursor: row-resize;
    user-select: none;
}

.course-code-ide__splitter:focus-visible,
.course-code-ide__height-handle:focus-visible {
    outline: 2px solid #8be9fd;
    outline-offset: -2px;
}

.course-code-ide-split--custom .course-code-ide__console-pane {
    max-height: none;
}

.course-code-ide__console-pane {
    flex: 1 1 25%;
    min-height: 80px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 0;
    background: #191a21;
}

.course-code-ide__console-label {
    flex: 0 0 auto;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--course-ide-muted);
    padding: 0.4rem 0.75rem 0.15rem;
    margin-bottom: 0;
}

.course-code-ide #courseCodeRunOutput {
    flex: 1 1 auto;
    min-height: 0;
    overflow: auto;
    padding: 0 0.75rem 0.5rem;
}

.course-code-ide .course-code-io {
    background: transparent;
    color: var(--course-ide-fg);
    padding: 0;
    border-radius: 0;
    font-size: 0.8125rem;
}

.course-code-ide #courseCodeRunOutputText {
    color: var(--course-ide-fg);
}

.course-code-ide__stdin {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.4rem 0.65rem 0.55rem;
    border-top: 1px solid var(--course-ide-border);
    background: #21222c;
}

.course-code-ide__stdin.d-none {
    display: none !important;
}

.course-code-ide__stdin-input {
    flex: 1;
    min-width: 0;
    border: 1px solid #6272a4;
    border-radius: 0.35rem;
    background: #282a36;
    color: var(--course-ide-fg);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.8125rem;
    padding: 0.35rem 0.55rem;
}

.course-code-ide__stdin-input:focus {
    outline: none;
    border-color: #8be9fd;
    box-shadow: 0 0 0 1px rgba(139, 233, 253, 0.35);
}

.course-code-ide__stdin-submit {
    flex-shrink: 0;
    font-weight: 600;
    white-space: nowrap;
}

@media (max-width: 575.98px) {
    .course-code-ide {
        --course-ide-h: clamp(400px, 55vh, 560px);
    }
}

.course-code-io {
    white-space: pre-wrap;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.875rem;
    background: #f8fafc;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
}

#courseCodeRunOutputText {
    white-space: pre;
}

.course-code-python-status[data-tone="ready"] {
    color: #15803d;
}

.course-code-python-status[data-tone="error"] {
    color: #b91c1c;
}

.course-code-sample-table pre {
    margin: 0;
    background: transparent;
    padding: 0;
}

/* Livedraw FAB on practice steps: clear of footer CTA */
body.course-player-page #livedraw-floating-btn,
body.course-player-page .livedraw-floating-btn {
    z-index: 1055;
    bottom: 4.25rem;
    right: 1rem;
}

body.course-player-page #livedraw-toolbar {
    z-index: 1056 !important;
    bottom: 4.5rem;
}

body.course-player-page #livedraw-hint,
body.course-player-page .livedraw-hint {
    z-index: 1057;
    bottom: 5rem;
}

body.course-player-page .livedraw-canvas-container {
    z-index: 1050 !important;
}

@media (min-width: 768px) {
    body.course-player-page #livedraw-floating-btn,
    body.course-player-page .livedraw-floating-btn {
        bottom: 5rem;
        right: 1.25rem;
    }

    body.course-player-page #livedraw-toolbar {
        bottom: 5.25rem;
    }

    body.course-player-page #livedraw-hint,
    body.course-player-page .livedraw-hint {
        bottom: 5.75rem;
    }
}

/* --- Dark chrome: sidebar only. Topbar/header/steps stay light. */

.course-player-layout,
.course-player-body {
    --cp-chrome-bg: #1a1d23;
    --cp-chrome-bg-elevated: #22262e;
    --cp-chrome-text: #f1f5f9;
    --cp-chrome-muted: #94a3b8;
    --cp-chrome-border: rgba(255, 255, 255, 0.1);
    --cp-chrome-hover: rgba(255, 255, 255, 0.08);
    --cp-chrome-active: rgba(4, 150, 34, 0.28);
}

.course-player-sidebar--tree,
.offcanvas.course-sidebar-offcanvas--tree {
    background: #1a1d23;
    background-color: #1a1d23 !important;
    --bs-offcanvas-bg: #1a1d23;
    --bs-offcanvas-color: #f1f5f9;
    --cp-chrome-bg: #1a1d23;
    --cp-chrome-bg-elevated: #22262e;
    --cp-chrome-text: #f1f5f9;
    --cp-chrome-muted: #94a3b8;
    --cp-chrome-border: rgba(255, 255, 255, 0.1);
    --cp-chrome-hover: rgba(255, 255, 255, 0.08);
    --cp-chrome-active: rgba(4, 150, 34, 0.28);
    border-right-color: rgba(255, 255, 255, 0.1);
    color: #f1f5f9 !important;
}

.course-sidebar-head--tree {
    border-bottom-color: var(--cp-chrome-border);
}

.course-sidebar-offcanvas--tree .offcanvas-title {
    color: #f1f5f9 !important;
}

.course-player-sidebar--tree .course-sidebar-title,
.course-player-sidebar--tree h2.course-sidebar-title,
.course-sidebar-offcanvas--tree .course-sidebar-title {
    color: #f1f5f9 !important;
}

.course-sidebar-progress__track {
    background: rgba(255, 255, 255, 0.12);
}

.course-sidebar-progress__label,
.course-sidebar-progress__time,
.course-player-sidebar--tree .text-muted,
.course-sidebar-offcanvas--tree .text-muted {
    color: var(--cp-chrome-muted) !important;
}

.course-sidebar-search {
    background: var(--cp-chrome-bg-elevated);
    border-color: var(--cp-chrome-border);
    color: var(--cp-chrome-text);
}

.course-sidebar-search::placeholder {
    color: var(--cp-chrome-muted);
}

.course-sidebar-search:focus {
    background: var(--cp-chrome-bg-elevated);
    border-color: var(--egeok-accent, #049622);
    color: var(--cp-chrome-text);
    box-shadow: 0 0 0 0.2rem rgba(4, 150, 34, 0.25);
}

.course-sidebar-nav--tree {
    scrollbar-color: rgba(255, 255, 255, 0.35) rgba(255, 255, 255, 0.08);
}

.course-sidebar-nav--tree::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.06);
}

.course-sidebar-nav--tree::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.28);
}

.course-sidebar-nav--tree::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.42);
}

.course-sidebar-tree-label__text {
    color: #fff;
}

.course-sidebar-tree-section {
    border-bottom-color: var(--cp-chrome-border);
}

.course-sidebar-tree-section__summary {
    color: #fff;
}

.course-sidebar-tree-section__summary::before {
    color: #fff;
}

.course-sidebar-tree-section[open] > .course-sidebar-tree-section__summary {
    color: #fff;
    background: var(--cp-chrome-active);
}

.course-sidebar-tree-section__cover {
    background: var(--cp-chrome-bg-elevated);
}

.course-sidebar-lesson--tree {
    color: #fff;
}

.course-player-sidebar--tree .course-sidebar-lesson__optional,
.course-sidebar-offcanvas--tree .course-sidebar-lesson__optional {
    color: #7dd3fc;
}

.course-sidebar-lesson--tree:hover {
    background: var(--cp-chrome-hover);
    color: #fff;
}

.course-sidebar-lesson--tree.is-active {
    background: var(--cp-chrome-active);
    color: #fff;
    box-shadow: inset 3px 0 0 var(--egeok-accent, #049622);
}

.course-player-sidebar--tree .course-sidebar-tree-section.is-done > .course-sidebar-tree-section__summary,
.course-sidebar-offcanvas--tree .course-sidebar-tree-section.is-done > .course-sidebar-tree-section__summary {
    background: rgba(4, 150, 34, 0.45);
    color: #fff;
}

.course-player-sidebar--tree .course-sidebar-lesson--tree.is-done,
.course-player-sidebar--tree .course-sidebar-lesson--tree.is-done:hover,
.course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-done,
.course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-done:hover {
    background: rgba(4, 150, 34, 0.45);
    color: #fff;
}

.course-player-sidebar--tree .course-sidebar-lesson--tree.is-active.is-done,
.course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-active.is-done {
    background: rgba(4, 150, 34, 0.45);
    box-shadow: inset 3px 0 0 var(--egeok-accent, #049622);
}

.course-player-sidebar--tree .course-sidebar-tree-section.is-credited > .course-sidebar-tree-section__summary,
.course-sidebar-offcanvas--tree .course-sidebar-tree-section.is-credited > .course-sidebar-tree-section__summary {
    background: rgba(56, 189, 248, 0.38);
    color: #fff;
}

.course-player-sidebar--tree .course-sidebar-lesson--tree.is-credited,
.course-player-sidebar--tree .course-sidebar-lesson--tree.is-credited:hover,
.course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-credited,
.course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-credited:hover {
    background: rgba(56, 189, 248, 0.38);
    color: #fff;
}

.course-player-sidebar--tree .course-sidebar-lesson--tree.is-active.is-credited,
.course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-active.is-credited {
    background: rgba(56, 189, 248, 0.38);
    box-shadow: inset 3px 0 0 #38bdf8;
}

/* is-started fill: --p (0..100) mixes amber → green is-done */
.course-player-sidebar--tree .course-sidebar-tree-section.is-started > .course-sidebar-tree-section__summary,
.course-sidebar-offcanvas--tree .course-sidebar-tree-section.is-started > .course-sidebar-tree-section__summary,
.course-player-sidebar--tree .course-sidebar-lesson--tree.is-started,
.course-player-sidebar--tree .course-sidebar-lesson--tree.is-started:hover,
.course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-started,
.course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-started:hover {
    background: color-mix(
        in oklab,
        rgba(4, 150, 34, 0.45) calc(var(--p, 0) * 1%),
        rgba(251, 191, 36, 0.40)
    );
    color: #fff;
}

.course-player-sidebar--tree .course-sidebar-lesson--tree.is-active.is-started,
.course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-active.is-started {
    background: color-mix(
        in oklab,
        rgba(4, 150, 34, 0.45) calc(var(--p, 0) * 1%),
        rgba(251, 191, 36, 0.40)
    );
    box-shadow: inset 3px 0 0 color-mix(
        in oklab,
        var(--egeok-accent, #049622) calc(var(--p, 0) * 1%),
        var(--color-amber-400, #fbbf24)
    );
}

@supports not (background: color-mix(in oklab, red, blue)) {
    .course-player-sidebar--tree .course-sidebar-tree-section.is-started > .course-sidebar-tree-section__summary,
    .course-sidebar-offcanvas--tree .course-sidebar-tree-section.is-started > .course-sidebar-tree-section__summary,
    .course-player-sidebar--tree .course-sidebar-lesson--tree.is-started,
    .course-player-sidebar--tree .course-sidebar-lesson--tree.is-started:hover,
    .course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-started,
    .course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-started:hover,
    .course-player-sidebar--tree .course-sidebar-lesson--tree.is-active.is-started,
    .course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-active.is-started {
        background: rgba(251, 191, 36, 0.40);
        color: #fff;
    }

    .course-player-sidebar--tree .course-sidebar-lesson--tree.is-active.is-started,
    .course-sidebar-offcanvas--tree .course-sidebar-lesson--tree.is-active.is-started {
        box-shadow: inset 3px 0 0 var(--color-amber-400, #fbbf24);
    }
}

.course-sidebar-section__check {
    flex-shrink: 0;
    color: var(--egeok-accent, #049622);
    font-size: 0.875rem;
}

.course-player-sidebar--tree .course-sidebar-progress-ring,
.course-sidebar-offcanvas--tree .course-sidebar-progress-ring {
    flex-shrink: 0;
    width: 0.875rem;
    height: 0.875rem;
    transform: rotate(-90deg);
    display: block;
}

.course-player-sidebar--tree .course-sidebar-progress-ring__track,
.course-sidebar-offcanvas--tree .course-sidebar-progress-ring__track {
    stroke: rgba(255, 255, 255, 0.35);
}

.course-player-sidebar--tree .course-sidebar-progress-ring__value,
.course-sidebar-offcanvas--tree .course-sidebar-progress-ring__value {
    stroke: #fff;
    stroke-linecap: round;
}

.course-sidebar-lesson__lock {
    color: var(--cp-chrome-muted);
}

.course-player-sidebar--tree .course-sidebar-lesson__return,
.course-sidebar-offcanvas--tree .course-sidebar-lesson__return {
    color: #fbbf24;
    font-size: 0.875rem;
}

.course-sidebar-offcanvas--tree .offcanvas-header {
    border-bottom: 1px solid var(--cp-chrome-border);
}

.course-sidebar-offcanvas--tree .offcanvas-body {
    background: var(--cp-chrome-bg);
    color: var(--cp-chrome-text);
}

.course-sidebar-offcanvas--tree .btn-close {
    filter: invert(1) grayscale(100%);
    opacity: 0.75;
}

.course-sidebar-offcanvas--tree .btn-close:hover {
    opacity: 1;
}

.course-sidebar-cover {
    background: var(--cp-chrome-bg-elevated);
}