body {
    --course-outline-header-height: 71px;
    --course-overview-strip-height: 60px;
    --course-outline-top-offset: calc(var(--course-outline-header-height) + var(--course-overview-strip-height));
    --course-outline-panel-width: 420px;
    --course-outline-reserved-width: var(--course-outline-panel-width);
    --course-color-deep: #0f1b34;
    --course-color-main: #15284b;
    --course-color-main-strong: #213a64;
    --course-color-surface: #f5f9ff;
    --course-color-surface-strong: #e7f1ff;
    --course-color-border: #d7e4f3;
    --course-color-border-strong: #bfd3eb;
    --course-color-muted: #51607b;
    --course-color-muted-strong: #40506a;
    --course-color-highlight: #a9ddff;
    --course-color-warm: #ffbf4d;
    --course-color-warm-light: #ffd36e;
    --course-color-warm-text: #8f4d00;
    --course-outline-main-background-color: linear-gradient(135deg, var(--course-color-deep) 0%, var(--course-color-main) 55%, var(--course-color-main-strong) 100%);
    --course-outline-main-text-color: white;
}

#courseOverviewStrip {
    position: sticky;
    top: var(--course-outline-header-height);
    z-index: 2;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px 16px;
    padding: 12px 20px;
    background: var(--course-outline-main-background-color);
    box-shadow: 0 16px 32px rgba(15, 27, 52, 0.16);
}

.courseOverviewTitle {
    margin: 0;
    color: var(--course-outline-main-text-color);
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.3;
}

.courseOverviewTitleLink,
.courseOverviewTitleLink:hover,
.courseOverviewTitleLink:focus,
.courseOverviewTitleLink:active {
    color: var(--course-outline-main-text-color);
    text-decoration: none;
}

.courseOverviewActions {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.courseOverviewNavButton,
.courseOverviewNavButton:hover,
.courseOverviewNavButton:focus,
.courseOverviewNavButton:active {
    display: inline-flex;
    align-items: center;
    padding: 0;
    color: var(--course-outline-main-text-color);
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1.2;
    text-underline-offset: 3px;
}

.courseOverviewNavButtonDisabled {
    opacity: 0.45;
    cursor: default;
    text-decoration: none;
}

.courseOutlineToggle,
.courseOutlineToggle:hover,
.courseOutlineToggle:focus,
.courseOutlineToggle:active {
    box-sizing: border-box;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 40px;
    padding: 9px 14px;
    border: 1px solid rgba(226, 237, 255, 0.22);
    background: rgba(255, 255, 255, 0.08);
    color: white;
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1.2;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.courseOutlineToggle:hover,
.courseOutlineToggle:focus,
.courseOutlineToggle:active {
    border: 1px solid rgba(226, 237, 255, 0.22);
    background: rgba(255, 255, 255, 0.12);
    color: white;
}

.courseOutline {
    position: fixed;
    top: var(--course-outline-top-offset);
    right: 0;
    bottom: 0;
    width: min(var(--course-outline-panel-width), calc(100vw - 12px));
    height: calc(100vh - var(--course-outline-top-offset));
    height: calc(100dvh - var(--course-outline-top-offset));
    display: grid;
    align-items: stretch;
    overflow: hidden;
    z-index: 1;
}

.courseOutline[data-course-outline-state='expanded'] {
    pointer-events: auto;
}

.courseOutline[data-course-outline-state='collapsed'] {
    pointer-events: none;
}

.courseOutlineToggle {
    border-radius: 999px;
}

.courseOutlineToggleText {
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1.2;
    width: 154px;
}

.courseOutlineToggleArrow {
    font-size: 1rem;
    font-weight: 700;
    line-height: 1;
}

.courseOutlinePanel {
    min-height: 0;
    height: 100%;
    display: grid;
    grid-template-rows: minmax(0, 1fr);
    border: 1px solid var(--course-color-border);
    border-top: 0;
    border-right: 0;
    border-radius: 0;
    background: linear-gradient(180deg, #ffffff 0%, var(--course-color-surface) 100%);
    overflow: hidden;
}

.courseOutlinePanel[hidden] {
    display: none;
}

.courseOutlineLessons {
    min-height: 0;
    height: 100%;
    overflow-y: auto;
    display: grid;
    grid-template-columns: auto;
    align-content: start;
    align-items: start;
}

.courseOutlineLessonSummary {
    list-style: none;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
    align-items: center;
    padding: 12px;
    cursor: pointer;
    background: var(--course-color-surface);
    border-bottom: 1px solid var(--course-color-border);
}

.courseOutlineLessonHeading {
    display: grid;
    gap: 2px;
}

.courseOutlineLessonNumber {
    color: #627592;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.courseOutlineLessonTitle {
    color: #182236;
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1.4;
}

.courseOutlineLessonChevron {
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--course-color-main-strong);
    border-bottom: 2px solid var(--course-color-main-strong);
    transform: rotate(45deg);
    transition: transform 0.2s ease;
}

.courseOutlineLesson[open] .courseOutlineLessonChevron {
    transform: rotate(225deg);
}

.courseOutlineTaskList {
    display: grid;
    border-bottom: 1px solid var(--course-color-border);
}

.courseOutlineTask,
.courseOutlineTask:hover,
.courseOutlineTask:focus {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 12px;
    align-items: center;
    min-height: 52px;
    padding: 0 12px;
    background: transparent;
    color: var(--course-color-muted);
    border-top: 1px solid #e6eef8;
}

.courseOutlineTask:nth-child(1) {
    border-top: none;
}

.courseOutlineTask:hover,
.courseOutlineTask:focus {
    background: #eef5ff;
    color: #182236;
}

.courseOutlineTaskCurrent,
.courseOutlineTaskCurrent:hover,
.courseOutlineTaskCurrent:focus {
    background: var(--course-color-surface-strong);
    color: #182236;
    box-shadow: inset 3px 0 0 var(--course-color-warm);
}

.courseOutlineTaskCheckbox,
.courseOutlineTaskCheckbox:hover,
.courseOutlineTaskCheckbox:focus,
.courseOutlineTaskCheckbox:active {
    width: 22px;
    height: 22px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 2px solid #99aec7;
    border-radius: 2px;
    background: white;
    box-sizing: border-box;
    flex-shrink: 0;
}

.courseOutlineTaskCheckbox:hover,
.courseOutlineTaskCheckbox:focus,
.courseOutlineTaskCheckbox:active {
    border-color: var(--course-color-main);
    background: white;
}

.courseOutlineTaskCheckboxMark {
    width: 10px;
    height: 5px;
    border-left: 2px solid white;
    border-bottom: 2px solid white;
    opacity: 0;
    transform: rotate(-45deg) scale(0.7);
    transition: opacity 0.15s ease, transform 0.15s ease;
    margin-top: -1px;
}

.courseOutlineTaskCheckboxChecked,
.courseOutlineTaskCheckboxChecked:hover,
.courseOutlineTaskCheckboxChecked:focus,
.courseOutlineTaskCheckboxChecked:active {
    border-color: var(--course-color-main-strong);
    background: var(--course-color-main-strong);
}

.courseOutlineTaskCheckboxChecked .courseOutlineTaskCheckboxMark {
    opacity: 1;
    transform: rotate(-45deg) scale(1);
}

.courseOutlineTaskCheckbox:disabled,
.courseOutlineTaskCheckbox:disabled:hover,
.courseOutlineTaskCheckbox:disabled:focus,
.courseOutlineTaskCheckbox:disabled:active {
    opacity: 0.45;
    cursor: not-allowed;
}

.courseOutlineTaskCheckbox[aria-disabled='true'],
.courseOutlineTaskCheckbox[aria-disabled='true']:hover,
.courseOutlineTaskCheckbox[aria-disabled='true']:focus,
.courseOutlineTaskCheckbox[aria-disabled='true']:active {
    opacity: 0.45;
}

.courseOutlineTaskLink,
.courseOutlineTaskLink:hover,
.courseOutlineTaskLink:focus,
.courseOutlineTaskLink:active {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 10px;
    align-items: center;
    min-width: 0;
    padding: 10px 0;
    color: inherit;
}

.courseOutlineTaskText {
    min-width: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.courseOutlineTaskIcon {
    width: 16px;
    height: 16px;
    display: block;
}

.courseOutlineTaskTitle {
    min-width: 0;
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1.4;
}

.courseOutlineTaskAccessPill {
    display: inline-flex;
    align-items: center;
    padding: 2px 7px;
    border: 1px solid var(--pro-main-color);
    border-radius: 999px;
    background: var(--pro-main-color);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    line-height: 1.2;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.courseTaskTitleRow {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}

.courseTaskGateBadge {
    display: inline-flex;
    align-items: center;
    padding: 4px 9px;
    border: 1px solid var(--pro-main-color);
    border-radius: 999px;
    background: var(--pro-main-color);
    color: white;
    font-size: 0.8rem;
    font-weight: 700;
    line-height: 1.2;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.courseTaskGateCard {
    display: grid;
    gap: 16px;
    padding: 20px;
    border: 1px solid var(--course-color-border);
    border-radius: 4px;
    background: linear-gradient(180deg, #ffffff 0%, var(--course-color-surface) 100%);
}

.courseTaskGateIcon {
    width: 3rem;
    display: block;
}

.courseTaskGateEyebrow {
    margin: 0;
    color: #8b5b00;
    font-size: 0.8rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.courseTaskGateTitle {
    margin: 0;
    color: #182236;
    font-size: clamp(1.3rem, 1.1rem + 0.5vw, 1.6rem);
    line-height: 1.2;
}

.courseTaskGateDescription,
.courseTaskGateSupportText {
    margin: 0;
    color: #51607b;
    font-size: 1rem;
    line-height: 1.5;
}

.courseTaskGateSection {
    width: 100%;
    display: grid;
    justify-items: center;
    gap: 12px;
}

.courseTaskGateSection + .courseTaskGateSection {
    margin-top: 6px;
    padding-top: 18px;
    border-top: 1px solid var(--course-color-border);
}

.courseTaskGateFeatureList {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.courseTaskGateFeature {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border: 1px solid var(--course-color-border);
    border-radius: 999px;
    background: var(--course-color-surface);
    color: var(--course-color-muted-strong);
    font-size: 0.8rem;
    font-weight: 700;
    line-height: 1.2;
}

.courseTaskGateActions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.courseTaskGatePrimaryAction,
.courseTaskGatePrimaryAction:hover,
.courseTaskGatePrimaryAction:focus,
.courseTaskGatePrimaryAction:active {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    border-radius: 2px;
    background: var(--pro-main-color);
    color: white;
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
}

.courseTaskGateSecondaryAction,
.courseTaskGateSecondaryAction:hover,
.courseTaskGateSecondaryAction:focus,
.courseTaskGateSecondaryAction:active {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    border: 1px solid var(--course-color-border-strong);
    border-radius: 2px;
    background: var(--course-color-surface);
    color: var(--course-color-main);
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
}

#courseOutlineLoginPromptBackground {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(15, 27, 52, 0.32);
}

#courseOutlineLoginPrompt {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translatex(-50%) translatey(-50%);
    z-index: 201;
    width: 250px;
    max-width: calc(100% - 80px);
    display: grid;
    justify-items: center;
    text-align: center;
    padding: 20px;
    border-radius: 6px;
    border: 1px solid var(--course-color-border);
    background: white;
    box-shadow: 0 22px 44px rgba(15, 27, 52, 0.18);
}

#courseOutlineLoginPromptMessage {
    margin: 0 0 20px 0;
    color: #182236;
    font-size: 1rem;
    line-height: 1.5;
}

.courseOutlinePopupButton,
.courseOutlinePopupButton:hover,
.courseOutlinePopupButton:focus,
.courseOutlinePopupButton:active,
.courseOutlinePopupButtonSecondary,
.courseOutlinePopupButtonSecondary:hover,
.courseOutlinePopupButtonSecondary:focus,
.courseOutlinePopupButtonSecondary:active {
    width: 100%;
    padding: 10px 0;
    border-radius: 2px;
    background: linear-gradient(135deg, var(--course-color-main) 0%, var(--course-color-main-strong) 100%);
    color: white;
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.3;
    text-align: center;
    text-decoration: none;
    box-shadow: 0 12px 24px rgba(21, 40, 75, 0.16);
}

.courseOutlinePopupButton {
    margin-bottom: 10px;
}

.courseOutlinePopupButtonSecondary,
.courseOutlinePopupButtonSecondary:hover,
.courseOutlinePopupButtonSecondary:focus,
.courseOutlinePopupButtonSecondary:active {
    border: 1px solid var(--course-color-border-strong);
    background: var(--course-color-surface);
    color: var(--course-color-main);
}

@media screen and (min-width: 1000px) {
    .tutorialBody[data-course-outline-state='expanded'] .tutorialMain,
    .quizBody[data-course-outline-state='expanded'] .quizMain {
        padding-right: calc(var(--course-outline-reserved-width) + 20px);
    }
}

@media screen and (max-width: 700px) {
    #courseOverviewStrip {
        padding: 12px;
    }

    .courseOverviewActions {
        justify-content: flex-start;
    }

    .courseOverviewNavButtonPrevious,
    .courseOverviewNavButtonPrevious:hover,
    .courseOverviewNavButtonPrevious:focus,
    .courseOverviewNavButtonPrevious:active,
    .courseOverviewNavButtonNext,
    .courseOverviewNavButtonNext:hover,
    .courseOverviewNavButtonNext:focus,
    .courseOverviewNavButtonNext:active {
        font-size: 0;
    }

    .courseOverviewNavButtonPrevious::before,
    .courseOverviewNavButtonNext::after {
        font-size: 0.9rem;
        line-height: 1.2;
    }

    .courseOverviewNavButtonPrevious::before {
        content: '←';
    }

    .courseOverviewNavButtonNext::after {
        content: '→';
    }
}

@media screen and (max-width: 550px) {
    .courseOutline {
        width: 100vw;
    }

    #courseOutlineLoginPrompt {
        max-width: calc(100% - 32px);
    }

    .courseTaskGatePrimaryAction,
    .courseTaskGatePrimaryAction:hover,
    .courseTaskGatePrimaryAction:focus,
    .courseTaskGatePrimaryAction:active,
    .courseTaskGateSecondaryAction,
    .courseTaskGateSecondaryAction:hover,
    .courseTaskGateSecondaryAction:focus,
    .courseTaskGateSecondaryAction:active {
        width: 100%;
    }
}