/* --- Floating Sticky Tabs Dock for Lesson Pages --- */
#lessonTabsFloatingWrapper {
    position: fixed;
    z-index: 1020;
    box-sizing: border-box;
    background-color: #ffffff;
    border: 1px solid #dee2e6;
    border-top: none;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
    padding: 0;
    margin: 0;
    pointer-events: auto;
    -webkit-font-smoothing: subpixel-antialiased;
    -moz-osx-font-smoothing: auto;
    max-width: 100vw;
}

#lessonTabsFloatingWrapper.is-hidden {
    transform: translateY(-100%);
    box-shadow: none;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.35s ease;
}

/* When floating dock is hidden, hide player TOC wrapper and curtain completely so only the pull tab is visible */
#lessonTabsFloatingWrapper.is-hidden .player-plus-toc-wrapper,
#lessonTabsFloatingWrapper.is-hidden .player-plus-toc-tab,
#lessonTabsFloatingWrapper.is-hidden .player-plus-toc-curtain {
    display: none;
}


#lessonTabsFloatingWrapper:not(.is-hidden) {
    transform: none;
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
}

#lessonTabsFloatingWrapper .lesson-tabs-floating-inner {
    display: flex;
    align-items: flex-start;
    width: 100%;
    margin: 0;
    padding: 0;
}

#lessonTabsFloatingWrapper .lesson-tabs-floating-list {
    display: flex;
    flex-wrap: wrap;
    flex: 1 1 auto;
    border: none;
    margin: 0;
    padding: 0;
    width: 100%;
    list-style: none;
}

#lessonTabsFloatingWrapper .lesson-tabs-floating-list .nav-item {
    margin: 0;
    padding: 0;
    flex: 0 0 auto;
}

#lessonTabsFloatingWrapper .lesson-tabs-floating-list .nav-link {
    display: block;
    width: 100%;
    text-align: center;
    white-space: nowrap;
    padding: 0.45rem 0.75rem;
    font-size: inherit;
    font-family: inherit;
    font-weight: normal;
    line-height: inherit;
    border: 1px solid #dee2e6;
    border-top: none;
    border-radius: 0 0 4px 4px;
    background-color: #ffffff;
    color: #337ab7;
    margin-top: 0;
    height: auto;
    -webkit-font-smoothing: subpixel-antialiased;
    -moz-osx-font-smoothing: auto;
    transition: background-color 0.15s ease, color 0.15s ease;
}

#lessonTabsFloatingWrapper .lesson-tabs-floating-list .nav-link:hover,
#lessonTabsFloatingWrapper .lesson-tabs-floating-list .nav-link:focus {
    background-color: #f8f9fa;
    color: #23527c;
}

#lessonTabsFloatingWrapper .lesson-tabs-floating-list .nav-link.active {
    background-color: #ffffff;
    color: #495057;
    font-weight: normal;
    border: 1px solid #dee2e6;
    border-top: 3px solid #337ab7;
    border-radius: 0 0 4px 4px;
    padding-top: 0.55rem;
    padding-bottom: 0.4rem;
    padding-left: 0.7rem;
    padding-right: 1rem;
    margin-top: 0;
    margin-bottom: -12px;
    height: auto;
    position: relative;
    z-index: 2;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    -webkit-font-smoothing: subpixel-antialiased;
    -moz-osx-font-smoothing: auto;
}

/* --- Floating Scroll-to-Top Button in bottom-right corner --- */
.lesson-scroll-top-btn {
    position: fixed;
    bottom: 28px;
    right: 28px;
    z-index: 1010;
    width: 46px;
    height: 46px;
    padding: 0;
    margin: 0;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 2.5px solid rgba(108, 117, 125, 0.45);
    color: rgba(108, 117, 125, 0.85);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
    cursor: pointer;
    outline: none;
    user-select: none;
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.lesson-scroll-top-btn.is-hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(14px);
}

.lesson-scroll-top-btn:hover,
.lesson-scroll-top-btn:focus {
    background-color: rgba(255, 255, 255, 0.95);
    border-color: #337ab7;
    color: #337ab7;
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(51, 122, 183, 0.28);
}

.lesson-scroll-top-btn:active {
    transform: translateY(0);
}

.lesson-scroll-top-btn svg {
    margin-top: -1px;
}

@media (max-width: 767px) {
    .lesson-scroll-top-btn {
        bottom: 20px;
        right: 18px;
        width: 42px;
        height: 42px;
    }
}

#lessonTabsFloatingWrapper .lesson-tabs-pull-tab {
    display: none;
    position: absolute;
    left: 50%;
    top: 100%;
    transform: translateX(-50%);
    cursor: pointer;
    z-index: 1025;
    user-select: none;
    outline: none;
    line-height: 1;
    background: none;
    border: none;
    padding: 0;
}

#lessonTabsFloatingWrapper.is-hidden .lesson-tabs-pull-tab {
    display: block;
}

#lessonTabsFloatingWrapper .pull-tab-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 3px 18px 4px 18px;
    background: #ffffff;
    border: 1px solid #dee2e6;
    border-top: none;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.12);
    color: #6c757d;
    transition: all 0.2s ease;
}

#lessonTabsFloatingWrapper .lesson-tabs-pull-tab:hover .pull-tab-pill,
#lessonTabsFloatingWrapper .lesson-tabs-pull-tab:focus .pull-tab-pill {
    background-color: #f8f9fa;
    color: #337ab7;
    padding-bottom: 6px;
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.18);
}

/* --- Hide default black audioplayer on Player+ tab --- */
#playerPlus .audioplayer {
    display: none;
}

/* --- Transcript pause-state highlight --- */
.transcript-line-selected {
    background-color: #dbeafe;
    color: #1e40af;
    border-left: 3px solid #337ab7;
    padding-left: 4px;
    padding-right: 4px;
    border-radius: 3px;
    box-shadow: 0 0 0 2px #dbeafe;
    transition: background-color 0.15s ease, color 0.15s ease;
}

/* --- Transcript playing-state highlight --- */
.transcript-line-playing {
    background-color: #dbeafe;
    color: #1e40af;
    border: none;
    border-left: none;
    padding-left: 4px;
    padding-right: 4px;
    border-radius: 3px;
    box-shadow: 0 0 0 2px #dbeafe;
    transition: background-color 0.15s ease, color 0.15s ease;
}

/* Mini Play Button inside selected replica */
.transcript-line-play-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 17px;
    height: 17px;
    flex: 0 0 17px;
    border-radius: 50%;
    background-color: #337ab7;
    color: #ffffff;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 0;
    margin: 0 5px 0 2px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
    transition: transform 0.15s ease, background-color 0.15s ease;
    vertical-align: middle;
    line-height: 1;
    position: relative;
    top: -3.5px;
}

.transcript-line-play-btn:hover {
    background-color: #23527c;
    transform: scale(1.15);
}

.transcript-line-play-btn:active {
    transform: scale(0.95);
}


/* --- Player+ Integrated Dock Toolbar --- */
.player-plus-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    box-sizing: border-box;
    width: 100%;
    max-width: 100%;
    background-color: #ffffff;
    color: #495057;
    padding: 6px 14px;
    user-select: none;
    -webkit-user-select: none;
}

/* Natural bar inside #playerPlus under tabs */
#playerPlusNaturalContainer {
    margin-bottom: 24px;
}

.player-plus-bar-natural {
    border: 1px solid #dee2e6;
    border-radius: 6px 6px 0 0;
    margin-bottom: 0;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

/* Floating bar docked inside #lessonTabsFloatingWrapper */
#lessonTabsFloatingWrapper .player-plus-bar-floating {
    border-top: 1px solid #e9ecef;
    border-radius: 0 0 10px 10px;
    margin: 0;
    padding: 6px 14px;
}

/* Play/Pause Button */
.player-plus-btn-playpause {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    flex: 0 0 34px;
    border-radius: 50%;
    border: none;
    background-color: #337ab7;
    color: #ffffff;
    cursor: pointer;
    outline: none;
    padding: 0;
    transition: background-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
    box-shadow: 0 2px 6px rgba(51, 122, 183, 0.3);
}

.player-plus-btn-playpause:hover,
.player-plus-btn-playpause:focus {
    background-color: #23527c;
    box-shadow: 0 3px 8px rgba(35, 82, 124, 0.4);
    transform: scale(1.04);
}

.player-plus-btn-playpause:active {
    transform: scale(0.96);
}

/* Time display */
.player-plus-time {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    font-size: 0.8rem;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: #6c757d;
    white-space: nowrap;
    flex: 0 0 auto;
    font-variant-numeric: tabular-nums;
    cursor: pointer;
    transition: color 0.15s ease;
}

.player-plus-time:hover {
    color: #337ab7;
}

.player-plus-current-time {
    font-weight: 600;
    color: #333333;
}

.player-plus-time-separator {
    color: #adb5bd;
}

/* Progress track container */
.player-plus-progress-container {
    flex: 1 1 auto;
    min-width: 80px;
    cursor: pointer;
    padding: 8px 0;
}

.player-plus-progress-track {
    position: relative;
    width: 100%;
    height: 6px;
    background-color: #e9ecef;
    border-radius: 3px;
    overflow: hidden;
    transition: height 0.15s ease;
}

.player-plus-progress-container:hover .player-plus-progress-track {
    height: 8px;
}

.player-plus-progress-buffered {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 0;
    background-color: #dee2e6;
    border-radius: 3px;
    transition: width 0.2s ease;
}

.player-plus-progress-bar-fill {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 0;
    background-color: #337ab7;
    border-radius: 3px;
    transition: width 0.05s linear;
}

/* Locate currently playing phrase button */
.player-plus-btn-locate {
    display: none;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    flex: 0 0 30px;
    border-radius: 6px;
    border: 1px solid #c8dcf0;
    background-color: #f0f7fd;
    color: #337ab7;
    cursor: pointer;
    outline: none;
    padding: 0;
    margin-right: 4px;
    transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.player-plus-btn-locate.is-visible {
    display: inline-flex;
}

.player-plus-btn-locate:hover,
.player-plus-btn-locate:focus {
    color: #23527c;
    background-color: #e2eef9;
    border-color: #a4c9eb;
    box-shadow: 0 1px 4px rgba(51, 122, 183, 0.2);
}

.player-plus-btn-locate:active {
    transform: scale(0.92);
}

/* Settings button */
.player-plus-btn-settings {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    flex: 0 0 32px;
    border-radius: 6px;
    border: 1px solid transparent;
    background: transparent;
    color: #6c757d;
    cursor: pointer;
    outline: none;
    padding: 0;
    transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}

.player-plus-btn-settings:hover,
.player-plus-btn-settings:focus,
.player-plus-btn-settings.is-active {
    color: #337ab7;
    background-color: #f1f3f5;
    border-color: #dee2e6;
}

/* Settings drawer - smoothly slides out to the right */
.player-plus-drawer {
    display: inline-flex;
    align-items: center;
    max-width: 0;
    opacity: 0;
    overflow: hidden;
    pointer-events: none;
    white-space: nowrap;
    transition: max-width 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease, margin 0.2s ease;
    margin-left: 0;
}

.player-plus-drawer.is-open {
    max-width: 340px;
    opacity: 1;
    pointer-events: auto;
    margin-left: 6px;
}

.player-plus-drawer-content {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 3px 8px 3px 10px;
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 20px;
}

.player-plus-switch-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin: 0;
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 500;
    color: #495057;
}

.player-plus-switch-item:hover {
    color: #212529;
}

/* iOS-style compact switch */
.player-plus-switch {
    position: relative;
    display: inline-block;
    width: 30px;
    height: 17px;
    flex: 0 0 30px;
    margin: 0;
}

.player-plus-switch input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.player-plus-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ced4da;
    border-radius: 17px;
    transition: background-color 0.2s ease;
}

.player-plus-slider:before {
    position: absolute;
    content: "";
    height: 13px;
    width: 13px;
    left: 2px;
    bottom: 2px;
    background-color: #ffffff;
    border-radius: 50%;
    transition: transform 0.2s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
}

.player-plus-switch input:checked + .player-plus-slider {
    background-color: #337ab7;
}

.player-plus-switch input:checked + .player-plus-slider:before {
    transform: translateX(13px);
}

/* Close drawer button */
.player-plus-drawer-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: #adb5bd;
    cursor: pointer;
    padding: 0;
    outline: none;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.player-plus-drawer-close:hover {
    color: #495057;
    background-color: #e9ecef;
}

/* Mobile responsive adjustments */
@media (max-width: 767px) {
    .player-plus-bar {
        position: relative;
        padding: 4px 8px;
        gap: 6px;
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }
    .player-plus-time {
        font-size: 0.72rem;
        gap: 2px;
    }
    .player-plus-progress-container {
        min-width: 40px;
    }
    /* On mobile, open drawer as a floating options card anchored below the settings button */
    .player-plus-drawer {
        position: absolute;
        top: calc(100% + 4px);
        right: 8px;
        max-width: none;
        width: auto;
        margin-left: 0;
        z-index: 1030;
        transform: translateY(-6px);
        transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
        visibility: hidden;
    }
    .player-plus-drawer.is-open {
        max-width: none;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translateY(0);
        margin-left: 0;
    }
    .player-plus-drawer-content {
        background-color: #ffffff;
        border: 1px solid #dee2e6;
        border-radius: 12px;
        padding: 8px 12px;
        gap: 12px;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    }
    .player-plus-switch-item {
        font-size: 0.76rem;
    }
}

@media (max-width: 480px) {
    .player-plus-bar {
        padding: 3px 6px;
        gap: 4px;
    }
    .player-plus-time {
        font-size: 0.68rem;
    }
    .player-plus-btn-playpause {
        width: 30px;
        height: 30px;
        flex: 0 0 30px;
    }
    .player-plus-btn-settings {
        width: 28px;
        height: 28px;
        flex: 0 0 28px;
    }
    .player-plus-progress-container {
        min-width: 30px;
    }
}

/* --- Chapter Pull-Tab & Sliding Curtain --- */
.player-plus-toc-wrapper {
    position: relative;
    width: 100%;
}

.player-plus-toc-tab {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    left: 50%;
    top: 100%;
    transform: translateX(-50%);
    background: none;
    border: none;
    padding: 0;
    margin: 0;
    cursor: pointer;
    outline: none;
    z-index: 1022;
}

.player-plus-toc-pill {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 2px 14px 4px 14px;
    background-color: #ffffff;
    border: 1px solid #dee2e6;
    border-top: none;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.08);
    font-size: 0.74rem;
    font-weight: 500;
    color: #6c757d;
    transition: background-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.player-plus-toc-tab:hover .player-plus-toc-pill,
.player-plus-toc-tab:focus .player-plus-toc-pill {
    background-color: #f8f9fa;
    color: #337ab7;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.14);
}

.player-plus-toc-arrow {
    display: inline-block;
    transition: transform 0.25s ease;
    font-size: 0.7rem;
    margin-top: -1px;
}

.player-plus-toc-wrapper.is-open .player-plus-toc-arrow {
    transform: rotate(180deg);
}

/* Sliding Curtain */
.player-plus-toc-curtain {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    pointer-events: none;
    background-color: #ffffff;
    border: 1px solid #dee2e6;
    border-top: 1px solid #f1f3f5;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease;
}

.player-plus-toc-wrapper.is-open .player-plus-toc-curtain {
    max-height: 400px;
    opacity: 1;
    pointer-events: auto;
}

.player-plus-toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 12px;
    background-color: #f8f9fa;
    border-bottom: 1px solid #e9ecef;
    font-size: 0.78rem;
    font-weight: 600;
    color: #495057;
}

.player-plus-toc-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.player-plus-toc-title {
    font-weight: 600;
    color: #495057;
    white-space: nowrap;
}

/* 3-position segmented switcher: I, I.1, I.1.a */
.player-plus-toc-level-switcher {
    display: inline-flex;
    align-items: center;
    background-color: #e9ecef;
    border-radius: 6px;
    padding: 2px;
    gap: 2px;
}

.player-plus-toc-level-btn {
    border: none;
    background: transparent;
    color: #6c757d;
    font-size: 0.72rem;
    font-weight: 600;
    line-height: 1.2;
    padding: 2px 7px;
    border-radius: 4px;
    cursor: pointer;
    outline: none;
    transition: background-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
    user-select: none;
}

.player-plus-toc-level-btn:hover {
    color: #212529;
}

.player-plus-toc-level-btn.is-active {
    background-color: #ffffff;
    color: #337ab7;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

.player-plus-toc-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: #adb5bd;
    cursor: pointer;
    padding: 0;
    outline: none;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.player-plus-toc-close:hover {
    background-color: #e9ecef;
    color: #495057;
}

.player-plus-toc-list {
    max-height: 340px;
    overflow-y: auto;
    padding: 4px 0;
    margin: 0;
    list-style: none;
}

/* Scrollbar for curtain */
.player-plus-toc-list::-webkit-scrollbar {
    width: 5px;
}
.player-plus-toc-list::-webkit-scrollbar-thumb {
    background-color: #ced4da;
    border-radius: 3px;
}

/* TOC Item & Hierarchy */
.player-plus-toc-item {
    display: flex;
    align-items: center;
    gap: 4px;
    padding-top: 6px;
    padding-bottom: 6px;
    padding-right: 14px;
    font-size: 0.8rem;
    color: #495057;
    cursor: pointer;
    border-left: 3px solid transparent;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.player-plus-toc-item.is-hidden {
    display: none;
}

.player-plus-toc-item.level-1 {
    padding-left: 8px;
    font-weight: 600;
    color: #212529;
}

.player-plus-toc-item.level-2 {
    padding-left: 24px;
    font-weight: 500;
    color: #495057;
}

.player-plus-toc-item.level-3 {
    padding-left: 40px;
    font-weight: 400;
    color: #6c757d;
}

.player-plus-toc-item:hover {
    background-color: #f8fafd;
    color: #337ab7;
    border-left-color: #93c5fd;
}

.player-plus-toc-item.is-current {
    background-color: #ebf3fb;
    color: #1d5f96;
    border-left-color: #337ab7;
}

.player-plus-toc-item.is-current:hover {
    background-color: #e2eef9;
    border-left-color: #23527c;
}

/* Chevron accordion button */
.player-plus-toc-chevron {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    flex: 0 0 20px;
    padding: 0;
    border: none;
    background: transparent;
    color: #6c757d;
    cursor: pointer;
    outline: none;
    border-radius: 4px;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.player-plus-toc-chevron:hover {
    color: #337ab7;
    background-color: #e9ecef;
}

.player-plus-toc-chevron-svg {
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.player-plus-toc-chevron.is-expanded .player-plus-toc-chevron-svg {
    transform: rotate(90deg);
}

.player-plus-toc-chevron.is-collapsed .player-plus-toc-chevron-svg {
    transform: rotate(0deg);
}

/* Bullet spacer for leaf nodes without children */
.player-plus-toc-spacer {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    flex: 0 0 20px;
}

.player-plus-toc-bullet {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background-color: #ced4da;
    transition: background-color 0.15s ease;
}

.player-plus-toc-item:hover .player-plus-toc-bullet {
    background-color: #337ab7;
}

/* Item content */
.player-plus-toc-item-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    flex: 1 1 auto;
    min-width: 0;
}

.player-plus-toc-item-title {
    flex: 1 1 auto;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.player-plus-toc-item-time {
    flex: 0 0 auto;
    font-size: 0.74rem;
    font-variant-numeric: tabular-nums;
    color: #6c757d;
    background-color: #f1f3f5;
    padding: 1px 6px;
    border-radius: 10px;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.player-plus-toc-item.is-current .player-plus-toc-item-time {
    background-color: #337ab7;
    color: #ffffff;
}

@media (max-width: 480px) {
    .player-plus-toc-header {
        padding: 6px 10px;
    }
    .player-plus-toc-header-left {
        gap: 8px;
    }
    .player-plus-toc-title {
        font-size: 0.74rem;
    }
    .player-plus-toc-level-btn {
        padding: 2px 5px;
        font-size: 0.68rem;
    }
}

/* --- Sticky Educational Materials (Player+) --- */
.campus-card {
    box-sizing: border-box;
    max-width: 100%;
}

[data-sticky-until].is-sticky-pinned {
    position: fixed;
    z-index: 1010;
    margin: 0;
    background-color: #ffffff;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15), 0 2px 6px rgba(0, 0, 0, 0.08);
    box-sizing: border-box;
    pointer-events: auto;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: #adb5bd transparent;
    transition: box-shadow 0.25s ease;
}

[data-sticky-until].is-sticky-pinned::-webkit-scrollbar {
    width: 5px;
}

[data-sticky-until].is-sticky-pinned::-webkit-scrollbar-track {
    background: transparent;
}

[data-sticky-until].is-sticky-pinned::-webkit-scrollbar-thumb {
    background-color: #adb5bd;
    border-radius: 4px;
}

[data-sticky-until].is-sticky-pinned.is-expanded {
    max-height: 80vh;
}

div[data-sticky-until].is-sticky-pinned:not(.bs-callout) {
    background-color: #ffffff;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    padding: 8px;
}

div[data-sticky-until].is-sticky-pinned:not(.bs-callout) p {
    margin: 0;
}

div[data-sticky-until].is-sticky-pinned:not(.bs-callout) img {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

.bs-callout[data-sticky-until].is-sticky-pinned {
    background-color: #f1f3f5;
    border: 1px solid #dee2e6;
    border-left: 5px solid var(--info);
    border-radius: 4px;
}

.sticky-material-placeholder {
    visibility: hidden;
    pointer-events: none;
    box-sizing: border-box;
}

/* Floating control pill for pinned educational material */
.sticky-material-controls {
    position: fixed;
    z-index: 1015;
    display: none;
    align-items: center;
    gap: 2px;
    padding: 2px;
    margin: 0;
    border-radius: 14px;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid #ced4da;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.12);
    line-height: 1;
    pointer-events: auto;
    transition: top 0.15s ease, left 0.15s ease, opacity 0.2s ease;
}

.sticky-material-controls.is-visible {
    display: inline-flex;
}

.sticky-material-ctrl-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    flex: 0 0 24px;
    border: none;
    background: transparent;
    padding: 0;
    border-radius: 10px;
    cursor: pointer;
    outline: none;
    line-height: 1;
    color: #495057;
    transition: background-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.sticky-material-ctrl-btn:hover,
.sticky-material-ctrl-btn:focus {
    background-color: #e9ecef;
    color: #212529;
}

.sticky-material-ctrl-btn:active {
    transform: scale(0.92);
}

.sticky-material-ctrl-btn.sticky-material-btn-dismiss:hover,
.sticky-material-ctrl-btn.sticky-material-btn-dismiss:focus {
    background-color: #fee2e2;
    color: #dc3545;
}

.sticky-material-ctrl-divider {
    width: 1px;
    height: 14px;
    background-color: #dee2e6;
    margin: 0 1px;
}