/* ==========================================================================
   SLIDE DETAIL PAGE STYLES (slide-detail.css)
   ========================================================================== */
.sd-main {
    padding-top: 28px;
    padding-bottom: 80px;
}

/* Top Back Link */
.sd-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--sld-text);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    margin-bottom: 20px;
    transition: color 0.2s ease;
}

.sd-back:hover {
    color: var(--sld-ink);
}

/* Hero Slide Overview Card */
.sd-hero {
    background: var(--sld-surface);
    border: 1px solid var(--sld-line);
    border-radius: 20px;
    padding: 28px 32px;
    margin-bottom: 24px;
    box-shadow: 0 4px 20px color-mix(in srgb, var(--sld-ink) 3.00%, transparent);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.sd-hero__left {
    display: flex;
    align-items: center;
    gap: 24px;
    flex: 1;
}

.sd-hero__thumb {
    width: 170px;
    height: 105px;
    border-radius: 12px;
    object-fit: cover;
    border: 1px solid var(--sld-background);
    flex-shrink: 0;
    background-color: var(--sld-background);
}

.sd-hero__info {
    flex: 1;
}

.sd-hero__tag {
    background: var(--sld-background);
    color: var(--sld-text);
    font-size: 12px;
    font-weight: 500;
    padding: 4px 12px;
    border-radius: 100px;
    display: inline-block;
    margin-bottom: 8px;
}

.sd-hero__tag--trial {
    background: var(--sld-soft);
    color: var(--sld-brand);
}

.sd-hero__title {
    font-size: 24px;
    font-weight: 600;
    color: var(--sld-ink);
    margin: 0 0 6px 0;
}

.sd-hero__meta {
    font-size: 13.5px;
    color: var(--sld-muted);
    margin-bottom: 14px;
}

.sd-hero__progress-bar {
    background: var(--sld-background);
    height: 7px;
    border-radius: 100px;
    overflow: hidden;
    max-width: 360px;
    margin-bottom: 8px;
}

.sd-hero__progress-fill {
    background: var(--Light-Primary-50);
    height: 100%;
    border-radius: 100px;
    transition: width 0.3s ease;
}

.sd-hero__progress-text {
    font-size: 12.5px;
    color: var(--sld-muted);
    font-weight: 500;
}

.sd-hero__right {
    text-align: right;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    max-width: 220px;
    flex-shrink: 0;
}

.sd-hero__badge {
    font-size: 13px;
    font-weight: 500;
    padding: 6px 16px;
    border-radius: 100px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.sd-hero__badge--forever {
    background-color: var(--sld-success-soft);
    color: var(--sld-success);
}

.sd-hero__badge--warning {
    background-color: var(--sld-warning-soft);
    color: var(--sld-warning);
}

.sd-hero__badge--blue {
    background-color: var(--sld-soft);
    color: var(--sld-brand);
}

.sd-hero__badge--expired {
    background-color: var(--sld-danger-soft);
    color: var(--sld-danger);
}

.sd-expired-notice {
    display: flex;
    align-items: center;
    gap: 14px;
    margin: 18px 0;
    padding: 15px 18px;
    border: 1px solid var(--sld-danger-soft);
    border-radius: 14px;
    background: var(--sld-danger-soft);
    color: var(--sld-danger);
}

.sd-expired-notice__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    flex: 0 0 40px;
    border-radius: 50%;
    background: var(--sld-danger-soft);
    color: var(--sld-danger);
}

.sd-expired-notice__icon svg {
    width: 20px;
    height: 20px;
}

.sd-expired-notice strong {
    display: block;
    margin-bottom: 3px;
    font-size: 14px;
}

.sd-expired-notice p {
    margin: 0;
    color: var(--sld-danger);
    font-size: 13px;
    line-height: 1.5;
}

.sd-expired-notice>a {
    margin-left: auto;
    padding: 8px 13px;
    border-radius: 999px;
    background: var(--sld-danger);
    color: var(--sld-surface);
    font-size: 12px;
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
}

.sd-hero__badge-icon {
    font-size: 15px;
    font-weight: 700;
    line-height: 1;
    flex-shrink: 0;
}

.sd-hero__subtext {
    font-size: 12px;
    color: var(--sld-faint);
    line-height: 1.4;
    font-weight: 300;
}

/* Search Bar Box */
.sd-search {
    margin-bottom: 24px;
    position: relative;
    max-width: 300px;
}

.sd-search__input {
    width: 100%;
    height: 44px;
    padding: 0 16px 0 42px;
    border: 1px solid var(--sld-line);
    border-radius: 14px;
    background: var(--sld-surface);
    font-size: 14px;
    color: var(--sld-ink);
    outline: none;
    box-sizing: border-box;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.sd-search__input:focus {
    border-color: var(--Light-Primary-50);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--sld-brand) 12.00%, transparent);
}

.sd-search__input::placeholder {
    color: var(--sld-faint);
}

.sd-search__icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--sld-faint);
    pointer-events: none;
}

.sd-empty-state {
    padding: 52px 24px;
    text-align: center;
    background: var(--sld-surface);
    border: 1px solid var(--sld-line);
    border-radius: 16px;
}

.sd-empty-state__icon {
    width: 58px;
    height: 58px;
    margin: 0 auto 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: var(--sld-soft);
    color: var(--sld-brand);
}

.sd-empty-state__title {
    margin: 0 0 8px;
    color: var(--sld-ink);
    font-size: 18px;
    font-weight: 600;
}

.sd-empty-state__text {
    max-width: 460px;
    margin: 0 auto;
    color: var(--sld-muted);
    font-size: 14px;
    line-height: 1.6;
}

.sd-search-empty {
    padding: 34px 20px;
    text-align: center;
    color: var(--sld-muted);
    background: var(--sld-surface);
    border: 1px dashed var(--sld-line);
    border-radius: 16px;
}

.sd-search-empty[hidden] {
    display: none;
}

.sd-search-empty svg {
    display: block;
    width: 38px;
    height: 38px;
    margin: 0 auto 10px;
    color: var(--sld-brand);
}

.sd-search-empty strong,
.sd-search-empty span {
    display: block;
}

.sd-search-empty strong {
    margin-bottom: 5px;
    color: var(--sld-ink);
    font-size: 16px;
}

/* Modules Accordion List */
.sd-modules {
    display: flex;
    flex-direction: column;
    gap: 14px;
    opacity: 1;
    transition: opacity 0.12s ease;
}

.sd-modules.is-search-updating {
    opacity: 0.55;
}

.sd-module {
    background: var(--sld-surface);
    border: 1px solid var(--sld-line);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.2s ease;
}

.sd-module__head {
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
    background: var(--sld-surface);
    transition: background-color 0.2s ease;
}

.sd-module__head:hover {
    background-color: var(--sld-header-background);
}

.sd-module__title-wrap {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 16px;
    font-weight: 500;
    color: var(--sld-ink);
}

.sd-module__arrow {
    color: var(--sld-muted);
    transition: transform 0.25s ease;
    flex-shrink: 0;
}

.sd-module.is-open .sd-module__arrow {
    transform: rotate(180deg);
}

.sd-module__meta {
    font-size: 13.5px;
    color: var(--sld-faint);
    font-weight: 400;
}

.sd-module--locked .sd-module__head {
    background: var(--sld-line);
}

.sd-module--locked {
    background: var(--sld-background);
    border-color: var(--sld-line);
}

.sd-module--locked .sd-module__head:hover {
    background: var(--sld-line);
}

.sd-module--locked .sd-module__body {
    background: var(--sld-header-background);
    border-top-color: var(--sld-line);
}

.sd-module__body {
    padding: 16px 24px 16px 24px;
    display: none;
    border-top: 1px solid var(--sld-background);
}

.sd-module [hidden] {
    display: none !important;
}

.sd-lesson-group {
    border-bottom: 1px solid var(--sld-background);
}

.sd-module__body .sd-lesson-group:not(:last-child) {
    margin-bottom: 7px;
    padding-bottom: 7px;
}

.sd-lesson-group:last-child {
    border-bottom: 0;
}

/* Lesson Items */
.sd-lesson {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 68px;
    padding: 8px;
    border-radius: 14px;
}

.sd-lesson:hover {
    background: var(--sld-header-background);
}

.sd-lesson__folder {
    width: 52px;
    height: 46px;
    flex: none;
}

.sd-lesson__folder svg {
    display: block;
    width: 100%;
    height: 100%;
}

.sd-lesson__subtitle {
    color: var(--sld-muted);
    font-size: 13px;
}

.sd-lesson-children {
    margin: 8px 0 8px 77px;
    padding-left: 18px;
    border-left: 2px solid var(--sld-line);
}

.sd-lesson-group.collapsed .sd-lesson-children {
    display: none;
}

.sd-lesson__left {
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: 0;
    flex: 1 1 auto;
}

.sd-lesson__info {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.sd-lesson__title {
    font-size: 15px;
    font-weight: 600;
    color: var(--sld-ink);
    margin: 0;
    overflow-wrap: anywhere;
}

.sd-lesson__meta {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--sld-muted);
    font-weight: 300;
    margin-top: 3px;
}

.sd-lesson__status--done {
    background: var(--sld-success-soft);
    color: var(--sld-success);
    font-size: 12px;
    padding: 2px 10px;
    border-radius: 100px;
    font-weight: 400;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.sd-lesson__status--watching {
    background: var(--sld-warning-soft);
    color: var(--sld-warning);
    font-size: 12px;
    padding: 2px 10px;
    border-radius: 100px;
    font-weight: 400;
}

/* Lesson Item Action Group */
.sd-lesson__actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 10px;
    flex-shrink: 0;
}

.sd-lesson__chev.chev {
    display: grid;
    place-items: center;
    width: 30px;
    height: 30px;
    padding: 0;
    border: 0;
    border-radius: 10px;
    background: var(--sld-background);
    color: var(--sld-muted);
    flex: none;
}

.sd-lesson__chev svg {
    width: 17px;
    height: 17px;
    transition: transform .2s ease;
}

.sd-lesson-group.collapsed .sd-lesson__chev svg {
    transform: rotate(-90deg);
}

.sd-lesson-child {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 14px;
    align-items: center;
    min-height: 60px;
}

.sd-lesson-child:not(:last-child) {
    border-bottom: 1px solid var(--sld-background);
}

.sd-lesson-child__main {
    display: flex;
    align-items: center;
    gap: 11px;
    min-width: 0;
    color: var(--sld-text);
    font-weight: 600;
}

.sd-lesson-child__file {
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    border-radius: 9px;
    background: var(--sld-background);
    color: var(--sld-muted);
    flex: none;
}

.sd-lesson-child__file svg {
    width: 16px;
    height: 16px;
}

.sd-lesson-child__title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sd-lesson-child__actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.sd-lesson-child__plan {
    min-height: 34px;
    padding: 7px 12px;
}

.sd-lesson-child__label {
    color: var(--sld-muted);
    font-size: 11px;
    font-weight: 700;
}

/* Secondary Action Button: Lesson Plan */
.sd-btn-plan {
    background: var(--sld-soft);
    color: var(--sld-brand-dark);
    font-size: 12px;
    font-weight: 800;
    padding: 8px 14px;
    border-radius: 100px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    border: 1px solid var(--sld-icon-light);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: .01em;
}

.sd-btn-plan svg {
    display: block;
    width: 15px !important;
    min-width: 15px;
    max-width: 15px;
    height: 15px !important;
    min-height: 15px;
    max-height: 15px;
    color: var(--sld-brand);
    transition: color 0.2s ease;
    flex: 0 0 15px;
}

.sd-btn-plan:hover {
    background: var(--sld-soft);
    border-color: var(--sld-icon-light);
    color: var(--sld-brand-dark);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px color-mix(in srgb, var(--sld-black) 4.00%, transparent);
}

.sd-btn-plan:hover svg {
    color: var(--sld-brand-dark);
}

.sd-btn-plan--audio svg {
    color: var(--sld-brand-dark);
}

.sd-control-disabled,
.sd-lesson__actions button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    pointer-events: none;
    box-shadow: none;
    transform: none;
}

.sd-btn-plan.sd-control-disabled:hover,
.sd-lesson__actions button:disabled:hover {
    background: var(--sld-header-background);
    border-color: var(--sld-line);
    color: var(--sld-text);
    box-shadow: none;
    transform: none;
}

/* Dark Pill Action Button */
.sd-btn-dark {
    background: var(--sld-ink);
    color: var(--sld-surface);
    font-size: 12px;
    font-weight: 700;
    padding: 10px 24px;
    border-radius: 100px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.sd-btn-dark svg {
    display: block;
    width: 15px !important;
    min-width: 15px;
    max-width: 15px;
    height: 15px !important;
    min-height: 15px;
    max-height: 15px;
    flex: 0 0 15px;
}

.sd-btn-dark:hover {
    background: var(--sld-ink);
    color: var(--sld-surface);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px color-mix(in srgb, var(--sld-ink) 15.00%, transparent);
}

.sd-btn-dark:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    pointer-events: none;
    box-shadow: none;
    transform: none;
}

/* ==========================================================================
   SLIDE PRESENTATION VIEWER MODAL (Anti-download Protected)
   ========================================================================== */
.sd-viewer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
}

.sd-viewer.is-active {
    display: flex;
}

.sd-viewer__backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: color-mix(in srgb, var(--sld-ink) 85.00%, transparent);
    backdrop-filter: blur(8px);
}

.sd-viewer__dialog {
    position: relative;
    z-index: 2;
    width: 94vw;
    max-width: 1300px;
    height: 88vh;
    background: var(--sld-ink);
    border-radius: 20px;
    border: 1px solid color-mix(in srgb, var(--sld-surface) 10.0%, transparent);
    box-shadow: 0 25px 60px color-mix(in srgb, var(--sld-black) 50.0%, transparent);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sd-viewer__head {
    height: 58px;
    padding: 0 20px;
    background: var(--sld-ink);
    border-bottom: 1px solid color-mix(in srgb, var(--sld-surface) 8.00%, transparent);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-shrink: 0;
}

.sd-viewer__title-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    flex-shrink: 1;
}

.sd-viewer__badge {
    background: var(--Light-Primary-50);
    color: var(--sld-surface);
    font-size: 11px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
}

.sd-viewer__badge--doc {
    background: var(--sld-success);
    color: var(--sld-surface);
}

.sd-viewer__title {
    color: var(--sld-surface);
    font-size: 15px;
    font-weight: 600;
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 320px;
}

.sd-viewer__hint {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 12.5px;
    color: var(--sld-faint);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-shrink: 2;
}

.sd-viewer__shortcut-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 3px 12px;
    background: linear-gradient(135deg, color-mix(in srgb, var(--sld-brand) 15.00%, transparent) 0%, color-mix(in srgb, var(--sld-accent) 15.00%, transparent) 100%);
    border: 1px solid color-mix(in srgb, var(--sld-brand) 40.0%, transparent);
    border-radius: 100px;
    color: var(--sld-soft);
    font-size: 12px;
    font-weight: 500;
    box-shadow: 0 0 12px color-mix(in srgb, var(--sld-brand) 12.00%, transparent);
    animation: badgePulse 3s ease-in-out infinite;
}

@keyframes badgePulse {

    0%,
    100% {
        box-shadow: 0 0 8px color-mix(in srgb, var(--sld-brand) 12.00%, transparent);
        border-color: color-mix(in srgb, var(--sld-brand) 35.00%, transparent);
    }

    50% {
        box-shadow: 0 0 16px color-mix(in srgb, var(--sld-brand) 35.00%, transparent);
        border-color: color-mix(in srgb, var(--sld-brand) 65.00%, transparent);
    }
}

.sd-kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    font-size: 11px;
    font-weight: 700;
    font-family: inherit;
    color: var(--sld-surface);
    background: var(--sld-brand);
    border: 1px solid color-mix(in srgb, var(--sld-surface) 40.0%, transparent);
    border-radius: 4px;
    box-shadow: 0 1px 2px color-mix(in srgb, var(--sld-black) 30.0%, transparent);
}

.sd-viewer__shortcut-badge strong {
    color: var(--sld-brand-light);
    font-weight: 600;
}

.sd-viewer__hint-divider {
    color: var(--sld-text);
    font-size: 11px;
}

.sd-viewer__hint-nav {
    color: var(--sld-faint);
}

.sd-viewer__hint-nav strong {
    color: var(--sld-line);
}

/* Action buttons container */
.sd-viewer__actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

/* Base button style */
.sd-viewer__action-btn {
    height: 36px;
    padding: 0 14px;
    background: color-mix(in srgb, var(--sld-surface) 7.00%, transparent);
    border: 1px solid color-mix(in srgb, var(--sld-surface) 14.00%, transparent);
    color: var(--sld-background);
    font-size: 12.5px;
    font-weight: 500;
    font-family: inherit;
    border-radius: 100px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    cursor: pointer;
    white-space: nowrap;
    text-decoration: none;
    user-select: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 2px color-mix(in srgb, var(--sld-black) 15.00%, transparent);
}

.sd-viewer__action-btn svg {
    flex-shrink: 0;
}

.sd-viewer__action-btn:hover {
    background: color-mix(in srgb, var(--sld-surface) 14.00%, transparent);
    border-color: color-mix(in srgb, var(--sld-surface) 28.00%, transparent);
    color: var(--sld-surface);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px color-mix(in srgb, var(--sld-black) 25.00%, transparent);
}

/* Variant: Lesson Plan */
.sd-viewer__action-btn--plan {
    background: color-mix(in srgb, var(--sld-brand) 12.00%, transparent);
    border-color: color-mix(in srgb, var(--sld-brand) 28.00%, transparent);
    color: var(--sld-brand-light);
}

.sd-viewer__action-btn--plan:hover {
    background: color-mix(in srgb, var(--sld-brand) 22.00%, transparent);
    border-color: var(--sld-brand-light);
    color: var(--sld-surface);
}

/* Variant: Chế độ trình bày (Presenter) */
.sd-viewer__action-btn--presenter {
    background: color-mix(in srgb, var(--sld-warning-icon) 12.00%, transparent);
    border-color: color-mix(in srgb, var(--sld-warning-icon) 32.00%, transparent);
    color: var(--sld-warning-icon);
    font-weight: 600;
}

.sd-viewer__action-btn--presenter:hover {
    background: color-mix(in srgb, var(--sld-warning-icon) 24.00%, transparent);
    border-color: var(--sld-warning-icon);
    color: var(--sld-surface);
}

/* Variant: Close / Thoát */
.sd-viewer__action-btn--close {
    background: color-mix(in srgb, var(--sld-surface) 5.00%, transparent);
    border-color: color-mix(in srgb, var(--sld-surface) 12.00%, transparent);
    color: var(--sld-line);
}

.sd-viewer__action-btn--close:hover {
    background: color-mix(in srgb, var(--sld-danger) 18.00%, transparent);
    border-color: var(--sld-danger);
    color: var(--sld-danger-soft);
}

@media screen and (max-width: 1080px) {
    .sd-viewer__hint {
        display: none;
    }
}

/* Base style: Presenter exit button (hidden in normal modal) */
.sd-viewer__action-btn--presenter-exit {
    display: none !important;
    background: color-mix(in srgb, var(--sld-ink) 85.00%, transparent);
    border: 1px solid color-mix(in srgb, var(--sld-surface) 25.00%, transparent);
    color: var(--sld-surface);
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 16px color-mix(in srgb, var(--sld-black) 40.0%, transparent);
}

.sd-viewer__action-btn--presenter-exit:hover {
    background: color-mix(in srgb, var(--sld-danger) 30.0%, transparent);
    border-color: var(--sld-danger);
    color: var(--sld-danger-soft);
}

/* ==========================================================================
   FULLSCREEN & PRESENTING MODE STYLES (Full slide display for TV/Projector)
   ========================================================================== */
:fullscreen .sd-viewer__dialog,
:-webkit-full-screen .sd-viewer__dialog,
.sd-viewer.is-fullscreen .sd-viewer__dialog,
.sd-viewer.is-presenting .sd-viewer__dialog {
    width: 100vw !important;
    height: 100vh !important;
    max-width: 100vw !important;
    border-radius: 0 !important;
    border: none !important;
    background: var(--sld-black) !important;
}

:fullscreen .sd-viewer__head,
:-webkit-full-screen .sd-viewer__head,
.sd-viewer.is-fullscreen .sd-viewer__head,
.sd-viewer.is-presenting .sd-viewer__head {
    position: absolute;
    top: 60px;
    /* Positioned cleanly below the watermark badge at top: 16px */
    right: 20px;
    z-index: 100;
    height: auto;
    padding: 0;
    background: transparent;
    border: none;
}

/* Hide normal header items in full screen & presenting modes */
:fullscreen .sd-viewer__title-wrap,
:-webkit-full-screen .sd-viewer__title-wrap,
.sd-viewer.is-fullscreen .sd-viewer__title-wrap,
.sd-viewer.is-presenting .sd-viewer__title-wrap,
:fullscreen .sd-viewer__hint,
:-webkit-full-screen .sd-viewer__hint,
.sd-viewer.is-fullscreen .sd-viewer__hint,
.sd-viewer.is-presenting .sd-viewer__hint,
:fullscreen .sd-viewer__action-btn--plan,
:-webkit-full-screen .sd-viewer__action-btn--plan,
.sd-viewer.is-fullscreen .sd-viewer__action-btn--plan,
.sd-viewer.is-presenting .sd-viewer__action-btn--plan,
:fullscreen .sd-viewer__action-btn--presenter,
:-webkit-full-screen .sd-viewer__action-btn--presenter,
.sd-viewer.is-fullscreen .sd-viewer__action-btn--presenter,
.sd-viewer.is-presenting .sd-viewer__action-btn--presenter,
:fullscreen .sd-viewer__action-btn--close,
:-webkit-full-screen .sd-viewer__action-btn--close,
.sd-viewer.is-fullscreen .sd-viewer__action-btn--close,
.sd-viewer.is-presenting .sd-viewer__action-btn--close,
:fullscreen #planCloseBtn,
:-webkit-full-screen #planCloseBtn,
.sd-viewer.is-fullscreen #planCloseBtn {
    display: none !important;
}

/* Normal Fullscreen: Show "Thu nhỏ" button (both Slide and Lesson Plan) */
:fullscreen #viewerFullscreenBtn,
:-webkit-full-screen #viewerFullscreenBtn,
.sd-viewer.is-fullscreen #viewerFullscreenBtn,
:fullscreen #planFullscreenBtn,
:-webkit-full-screen #planFullscreenBtn,
.sd-viewer.is-fullscreen #planFullscreenBtn {
    background: color-mix(in srgb, var(--sld-ink) 85.00%, transparent);
    border: 1px solid color-mix(in srgb, var(--sld-surface) 25.00%, transparent);
    color: var(--sld-surface);
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 16px color-mix(in srgb, var(--sld-black) 40.0%, transparent);
    display: inline-flex !important;
}

/* Presenter Mode: Hide "Thu nhỏ" button and SHOW "Thoát" button */
.sd-viewer.is-presenting #viewerFullscreenBtn {
    display: none !important;
}

.sd-viewer.is-presenting #viewerPresenterExitBtn {
    display: inline-flex !important;
}

.sd-viewer__stage {
    position: relative;
    flex: 1;
    width: 100%;
    height: 100%;
    background: var(--sld-black);
    overflow: hidden;
}

.sd-viewer__stage iframe {
    width: 100%;
    height: 100%;
    border: none;
    transition: opacity 0.3s ease;
}

/* Click-through Anti-steal Overlay Protection Layer */
.sd-viewer__overlay {
    position: absolute;
    inset: 0;
    z-index: 10;
    pointer-events: all;
    user-select: none;
    -webkit-user-select: none;
    cursor: pointer;
}

.sd-viewer__mobile-nav {
    display: none;
}

/* For Google Docs Lesson Plan: allow full mouse wheel scroll & reading */
.sd-viewer--doc .sd-viewer__overlay {
    pointer-events: none;
}

.sd-viewer__loading {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    background: var(--sld-black);
    color: var(--sld-faint);
    font-size: 13.5px;
    z-index: 15;
    transition: opacity 0.3s ease;
}

.sd-viewer__loading.is-hidden {
    opacity: 0;
    pointer-events: none;
}

.sd-viewer__loading.is-download-loading {
    background: color-mix(in srgb, var(--sld-black) 78.00%, transparent);
}

.sd-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid color-mix(in srgb, var(--sld-brand) 20.0%, transparent);
    border-top-color: var(--sld-brand);
    border-radius: 50%;
    animation: sdSpin 0.75s linear infinite;
}

.sd-download-backdrop {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    background: color-mix(in srgb, var(--sld-black) 78.00%, transparent);
    color: var(--sld-faint);
    font-size: 13.5px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.sd-download-backdrop.is-active {
    opacity: 1;
    pointer-events: all;
}

@keyframes sdSpin {
    to {
        transform: rotate(360deg);
    }
}

/* Watermark: Single pill ở góc trên phải */
.sd-viewer__watermark {
    position: absolute;
    top: 16px;
    right: 20px;
    z-index: 10;
    pointer-events: none;
    user-select: none;
    background: color-mix(in srgb, var(--sld-ink) 65.00%, transparent);
    color: color-mix(in srgb, var(--sld-surface) 80.0%, transparent);
    padding: 6px 14px;
    border-radius: 100px;
    font-size: 11.5px;
    font-weight: 500;
    backdrop-filter: blur(4px);
    letter-spacing: 0.5px;
    white-space: nowrap;
    max-width: calc(100% - 40px);
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Responsive Rules */
@media screen and (max-width: 768px) {
    .sd-hero {
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
    }

    .sd-hero__left {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        width: 100%;
    }

    .sd-hero__thumb {
        width: 100%;
        height: 160px;
    }

    .sd-hero__progress-bar {
        max-width: 100%;
    }

    .sd-hero__right {
        align-items: flex-start;
        text-align: left;
        max-width: 100%;
    }

    .sd-lesson {
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
    }

    .sd-lesson__actions {
        width: 100%;
        display: flex;
        gap: 10px;
    }

    .sd-lesson-child {
        grid-template-columns: minmax(0, 1fr);
        margin-left: 24px;
    }

    .sd-lesson-child__actions {
        width: 100%;
        flex-wrap: wrap;
    }

    .sd-btn-plan {
        flex: 1;
        justify-content: center;
    }

    .sd-btn-dark {
        flex: 1;
        width: auto;
    }

    .sd-viewer__dialog {
        width: 100vw;
        height: 100vh;
        border-radius: 0;
    }
}

/* Touch devices interact directly with the native presentation iframe. */
@media (hover: none),
(pointer: coarse) {
    .sd-viewer:not(.sd-viewer--doc) .sd-viewer__overlay {
        pointer-events: none;
    }
}

/* Compact touch layout for the curriculum on phones. */
@media screen and (max-width: 640px) {
    .sd-main {
        padding-top: 16px;
        padding-bottom: 48px;
    }

    .sd-expired-notice {
        align-items: flex-start;
        flex-wrap: wrap;
        padding: 14px;
    }

    .sd-expired-notice>div {
        flex: 1;
        min-width: 0;
    }

    .sd-expired-notice>a {
        width: 100%;
        margin-left: 0;
        text-align: center;
    }

    .sd-main .db-container {
        padding-left: 12px;
        padding-right: 12px;
    }

    .sd-back {
        margin-bottom: 14px;
    }

    .sd-hero {
        padding: 16px;
        margin-bottom: 16px;
        border-radius: 16px;
    }

    .sd-hero__left {
        gap: 12px;
    }

    .sd-hero__thumb {
        height: auto;
        aspect-ratio: 16 / 9;
    }

    .sd-hero__title {
        font-size: 20px;
        line-height: 1.3;
    }

    .sd-search {
        max-width: none;
        margin-bottom: 16px;
    }

    .sd-modules {
        gap: 10px;
    }

    .sd-module {
        border-radius: 14px;
    }

    .sd-module__head {
        display: grid;
        grid-template-columns: minmax(0, 1fr);
        gap: 5px;
        padding: 13px 14px;
    }

    .sd-module__title-wrap {
        display: grid;
        grid-template-columns: 18px minmax(0, 1fr);
        gap: 8px;
        font-size: 14px;
        line-height: 1.35;
    }

    .sd-module__meta {
        padding-left: 26px;
        font-size: 11.5px;
        line-height: 1.35;
    }

    .sd-module__body {
        padding: 8px 10px 10px;
    }

    .sd-module__body .sd-lesson-group:not(:last-child) {
        margin-bottom: 6px;
        padding-bottom: 6px;
    }

    .sd-lesson {
        padding: 9px 4px;
        gap: 10px;
    }

    .sd-lesson__left {
        width: 100%;
        gap: 10px;
    }

    .sd-lesson__folder {
        width: 42px;
        height: 37px;
    }

    .sd-lesson__title {
        font-size: 13.5px;
        line-height: 1.35;
    }

    .sd-lesson__subtitle,
    .sd-lesson__meta {
        font-size: 11.5px;
    }

    .sd-lesson__actions {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 7px;
        width: 100%;
    }

    .sd-lesson__actions:has(> .sd-lesson__chev.chev) {
        grid-template-columns: repeat(2, minmax(0, 1fr)) 36px;
    }

    .sd-btn-plan,
    .sd-btn-dark {
        width: 100%;
        min-width: 0;
        min-height: 36px;
        padding: 7px 9px;
        font-size: 13px;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .sd-btn-plan span {
        min-width: 0;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .sd-lesson__chev.chev {
        width: 36px;
        height: 36px;
    }

    .sd-lesson__actions:has(> .sd-lesson__chev.chev)>.sd-lesson__chev.chev {
        grid-column: 3;
    }

    .sd-lesson__actions:has(> .sd-lesson__chev.chev)>.sd-btn-plan:first-child:nth-last-child(2),
    .sd-lesson__actions:has(> .sd-lesson__chev.chev)>.sd-btn-dark:first-child:nth-last-child(2) {
        grid-column: 1 / 3;
    }

    .sd-lesson__actions>.sd-btn-plan:only-child,
    .sd-lesson__actions>.sd-btn-dark:only-child {
        grid-column: 2;
        justify-self: end;
        width: 100%;
    }

    .sd-lesson-children {
        margin: 5px 0 5px 18px;
        padding-left: 10px;
    }

    .sd-lesson-child {
        grid-template-columns: minmax(0, 1fr);
        gap: 7px;
        min-height: 52px;
        margin-left: 0;
        padding: 7px 0;
    }

    .sd-lesson-child__main {
        gap: 8px;
    }

    .sd-lesson-child__file {
        width: 28px;
        height: 28px;
    }

    .sd-lesson-child__title {
        white-space: normal;
        line-height: 1.35;
        font-size: 12.5px;
    }

    .sd-lesson-child__actions {
        width: 100%;
    }

    .sd-lesson-child__actions .sd-btn-plan {
        flex: 1 1 auto;
        width: 100%;
    }

    .sd-viewer__head {
        height: auto;
        min-height: 56px;
        padding: 8px 10px;
        gap: 8px;
    }

    .sd-viewer__badge {
        padding: 4px 7px;
        font-size: 9px;
    }

    .sd-viewer__title {
        max-width: 34vw;
        font-size: 12px;
    }

    .sd-viewer__actions {
        gap: 6px;
    }

    .sd-viewer__action-btn {
        padding: 7px 9px;
    }

    .sd-viewer__action-btn span {
        display: none;
    }
}

/* Shared member shell + document-style course detail. Viewer rules stay unchanged. */
.sd-detail-redesign {
    padding-top: 28px;
}

.sd-detail-redesign .db-container {
    max-width: 1440px;
    padding: 0 32px;
}

.sd-detail-redesign .sd-hero {
    border-radius: 24px;
    box-shadow: none;
    padding: 32px;
    margin-top: 20px;
}

.sd-detail-redesign .sd-hero__title {
    font-size: 32px;
    line-height: 1.3;
}

.sd-detail-redesign .sd-hero__thumb {
    border-radius: 16px;
}

.sd-detail-redesign .sd-search {
    width: 100%;
    max-width: none;
    border-radius: 16px;
    background: var(--sld-surface);
}

.sd-detail-redesign .sd-module {
    border-radius: 20px;
    box-shadow: none;
    border-color: var(--sld-line);
    overflow: hidden;
}

.sd-detail-redesign .sd-module__head {
    padding: 22px 24px;
    background: var(--sld-surface);
}

.sd-detail-redesign .sd-module__title-wrap {
    color: var(--sld-ink);
}

.sd-detail-redesign .sd-lesson__title {
    color: var(--sld-ink);
}

.course-preview-link {
    display: inline-flex;
    margin: 0 0 0 16px;
    padding: 10px 16px;
    border: 1px solid var(--sld-line);
    border-radius: 999px;
    color: var(--sld-brand);
    background: var(--sld-surface);
    font-size: 14px;
    font-weight: 600;
}

.course-preview-link:focus-visible {
    outline: 2px solid var(--sld-brand-light);
    outline-offset: 3px;
}

@media(max-width:700px) {
    .sd-detail-redesign .db-container {
        padding: 0 16px;
    }

    .sd-detail-redesign .sd-hero {
        padding: 20px;
    }

    .sd-detail-redesign .sd-hero__title {
        font-size: 24px;
    }

    .course-preview-link {
        margin: 0 0 12px;
    }

    .sd-detail-redesign .sd-module__head {
        padding: 18px 16px;
    }
}

body:has(.sd-detail-redesign) {
    padding-top: 0;
    background: var(--sld-bg);
}

@media(max-width:767px) {
    .sd-detail-redesign {
        padding-top: 80px;
    }
}

/* Live course adopts S4 document layout directly, with real legacy data. */

#slideDetailPage {
    padding: 28px 32px 64px;
}

#slideDetailPage .sd-back {
    display: flex;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--sld-line);
    margin: 0;
    color: var(--sld-muted);
}

.course-document-cover {
    position: relative;
    height: 190px;
    background: #F5F5F5;
    border-radius: 20px;
    margin-top: 24px;
}

.course-document-cover::before {
    content: "";
    position: absolute;
    inset: 40px 0 0 34%;
    border-radius: 0 0 20px 0;
    background: radial-gradient(circle, rgba(18, 53, 174, .3) 1px, transparent 1.7px) 0 0 / 12px 12px;
    mask-image: linear-gradient(90deg, transparent, #000 55%);
}

.course-document-icon {
    position: absolute;
    left: 32px;
    bottom: -28px;
    width: 64px;
    height: 64px;
    display: grid;
    place-items: center;
    background: white;
    border-radius: 16px;
    box-shadow: 0 1px 4px #0002;
}

.course-document-icon svg {
    width: 32px;
    height: 32px;
}

.course-document-title {
    margin: 50px 0 16px;
    color: var(--sld-ink);
    font-size: 40px;
    line-height: 1.15;
    font-weight: 600;
    letter-spacing: -.03em;
}

.course-document-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    margin: 10px 0;
    color: var(--sld-muted);
    font-size: 14px;
}

.course-document-meta>span:first-child {
    width: 120px;
    color: var(--sld-faint);
}

.course-document-meta strong {
    font-weight: 400;
}

.course-document-stats {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.course-document-stats b {
    padding: 4px 12px;
    border-radius: 6px;
    font-weight: 500;
    background: var(--sld-success-soft);
    color: var(--sld-success);
}

.course-document-stats b+b {
    background: var(--sld-soft);
    color: var(--sld-brand);
}

.course-document-progress {
    margin: 24px 0 32px;
    padding: 20px;
    border: 1px solid var(--sld-line);
    background: var(--sld-bg);
    border-radius: 16px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.course-document-progress .sd-hero__progress-bar {
    flex: 1;
    max-width: 600px;
    margin: 0;
}

.course-document-progress .sd-hero__progress-text {
    margin: 0;
    font-size: 14px;
}

.course-content-tools {
    padding: 20px 24px;
    background: var(--sld-bg);
    border: 1px solid var(--sld-line);
    border-radius: 16px;
    margin: 24px 0;
}

.course-content-tools h2 {
    font-size: 15px;
    margin: 0 0 12px;
    font-weight: 500;
}

.course-content-tools .sd-search {
    margin: 0;
    border-radius: 999px;
}

.course-list-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin: 28px 0 20px;
}

.course-list-heading h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--sld-ink);
    margin: 0;
}

.course-list-heading>span {
    font-size: 13px;
    color: var(--sld-muted);
}

#slideDetailPage .sd-module {
    border: 0;
    border-radius: 0;
    overflow: visible;
    margin: 0 0 24px;
}

#slideDetailPage .sd-module__head {
    padding: 14px 16px;
    background: var(--sld-soft);
    border: 1px solid var(--sld-line);
    border-radius: 12px;
}

#slideDetailPage .sd-module__title-wrap {
    font-size: 16px;
}

#slideDetailPage .sd-module__body {
    padding: 0;
}

#slideDetailPage .sd-lesson-group {
    border-bottom: 1px solid var(--sld-line);
}

#slideDetailPage .sd-lesson {
    background: transparent;
    padding: 22px 16px;
    border-radius: 0;
}

#slideDetailPage .sd-lesson:hover {
    background: var(--sld-bg);
}

#slideDetailPage .sd-lesson__folder {
    width: 40px;
    height: 40px;
    background: var(--sld-soft);
    border-radius: 10px;
    display: grid;
    place-items: center;
}

#slideDetailPage .sd-lesson__folder svg {
    width: 24px;
    height: 24px;
}

#slideDetailPage .sd-lesson__title {
    font-size: 16px;
    font-weight: 500;
}

#slideDetailPage .sd-btn-present {
    background: var(--sld-brand);
    border-radius: 999px;
}

#slideDetailPage .sd-lesson-children {
    margin: 0 16px 16px 56px;
}

@media(max-width:767px) {
    #slideDetailPage {
        padding: 80px 16px 32px;
    }

    #slideDetailPage>.db-container {
        padding: 20px 16px 32px;
    }

    .course-document-cover {
        height: 120px;
    }

    .course-document-title {
        font-size: 28px;
    }

    .course-document-progress {
        flex-wrap: wrap;
    }

    .course-document-progress .sd-hero__progress-bar {
        flex-basis: 100%;
    }

    .course-content-tools {
        padding: 16px;
    }

    .course-list-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .course-document-meta>span:first-child {
        width: 90px;
    }
}

.course-levels {
    margin: 0 0 24px;
}

.course-levels>div {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.course-levels button {
    padding: 10px 16px;
    border: 1px solid var(--sld-line);
    background: var(--sld-surface);
    border-radius: 10px;
    color: var(--sld-muted);
    font: inherit;
    cursor: pointer;
}

.course-levels button[aria-pressed="true"] {
    color: var(--sld-brand);
    background: var(--sld-soft);
    border-color: var(--sld-brand);
}

.course-unit-label {
    margin: 16px 0 0;
    padding: 10px 16px;
    background: var(--sld-soft);
    color: var(--sld-brand);
    font-weight: 600;
    font-size: 14px;
}

.course-session-content {
    margin: 0 16px 20px 72px;
    border: 1px solid var(--sld-line);
    border-radius: 12px;
}

.course-session-content summary {
    cursor: pointer;
    padding: 14px 16px;
    color: var(--sld-brand);
    font-weight: 500;
}

.course-session-blocks {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    padding: 0 16px 20px;
}

.course-session-blocks h4 {
    font-size: 14px;
    margin: 0 0 8px;
    color: var(--sld-ink);
}

.course-session-blocks p {
    font-size: 14px;
    line-height: 1.7;
    margin: 0;
    overflow-wrap: anywhere;
}

.course-plan-dialog {
    width: min(1000px, calc(100vw - 32px));
    max-height: 90dvh;
    padding: 0;
    border: 1px solid var(--sld-line);
    border-radius: 20px;
    color: var(--sld-text);
    background: var(--sld-surface);
}

.course-plan-dialog::backdrop {
    background: #0b1b4d88;
}

.course-plan-dialog>header {
    display: flex;
    align-items: center;
    gap: 20px;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--sld-line);
}

.course-plan-dialog h2 {
    font-size: 20px;
    margin: 0;
}

.course-plan-dialog header button {
    width: 40px;
    height: 40px;
    border: 0;
    background: var(--sld-soft);
    border-radius: 50%;
    color: var(--sld-ink);
    font-size: 26px;
    cursor: pointer;
}

.course-plan-dialog article {
    padding: 24px;
    overflow: auto;
    max-height: 70dvh;
    line-height: 1.8;
    overflow-wrap: anywhere;
}

.course-plan-dialog article table {
    border-collapse: collapse;
    width: 100%;
    margin: 16px 0;
}

.course-plan-dialog article td,
.course-plan-dialog article th {
    border: 1px solid var(--sld-line);
    padding: 12px;
    vertical-align: top;
}

.course-plan-dialog article th {
    background: var(--sld-bg);
}

.course-plan-dialog article ul,
.course-plan-dialog article ol {
    padding-left: 24px;
}

@media(max-width:700px) {
    .course-session-content {
        margin: 0 8px 16px;
    }

    .course-session-blocks {
        grid-template-columns: 1fr;
    }

    .course-plan-dialog article {
        padding: 16px;
    }
}

.course-block-body {
    font-size: 14px;
    line-height: 1.8;
    overflow-wrap: anywhere;
}

.course-block-body ul,
.course-block-body ol {
    padding-left: 24px;
    margin: 12px 0;
    list-style-position: outside;
}

.course-block-body ul {
    list-style-type: disc;
}

.course-block-body ul ul {
    list-style-type: circle;
}

.course-block-body ol {
    list-style-type: decimal;
}

.course-block-body li {
    margin: 8px 0;
}

.course-block-body p {
    margin: 0 0 12px;
}

.course-block-body strong,
.course-block-body b {
    font-weight: 700;
}

.course-block-body table {
    border-collapse: collapse;
    width: 100%;
}

.course-block-body td,
.course-block-body th {
    padding: 10px;
    border: 1px solid var(--sld-line);
}

/* Detailed child sessions keep legacy link rows intact. */
.sd-lesson-child.course-detailed-child {
    flex-wrap: wrap;
    gap: 16px
}

.course-detailed-child .course-session-content {
    flex-basis: 100%;
    width: 100%;
    margin: 0
}

.course-child-summary {
    font-size: 14px;
    line-height: 1.6;
    color: var(--sld-muted);
    margin: 6px 0 0;
    max-width: 720px
}

/* Reference syllabus flow: Module tabs → search → today's lesson → Unit/session rows. */
.course-tabs-layout [hidden] {
    display: none !important
}

.course-tabs-layout .course-introduction {
    margin: 26px 0 0;
    padding: 20px 24px;
    border-left: 4px solid #b8c8f7;
    border-radius: 0 16px 16px 0;
    background: #f5f6f8;
    font-size: 16px;
    line-height: 1.8;
    color: var(--sld-ink)
}

.course-tabs-layout .course-content-tools {
    padding: 0;
    border: 0;
    background: none
}

.course-module-tabs {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding: 4px 0 18px;
    margin-bottom: 18px;
    scrollbar-width: thin
}

.course-module-tabs button {
    flex: 0 0 auto;
    min-width: 172px;
    max-width: 360px;
    border: 1px solid #dce4f7;
    border-radius: 18px;
    padding: 16px 20px;
    background: #fff;
    text-align: left;
    color: var(--sld-muted);
    font: inherit;
    cursor: pointer
}

.course-module-tabs button[aria-selected=true] {
    border-color: var(--sld-brand);
    background: #edf2ff;
    color: var(--sld-brand);
    box-shadow: 0 0 0 1px var(--sld-brand)
}

.course-module-tab-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 17px;
    line-height: 1.4
}

.course-module-tab-label i {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #8fabff;
    flex: none
}

.course-module-tabs button[aria-selected=true] i {
    background: var(--sld-brand)
}

.course-module-tabs small {
    display: block;
    margin-top: 5px;
    font-size: 13px;
    color: var(--sld-muted)
}

.course-tabs-layout .sd-module {
    border: 0;
    background: none;
    border-radius: 0;
    box-shadow: none
}

.course-tabs-layout .sd-module__body {
    display: block;
    padding: 0
}

.course-module-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    font-size: 18px;
    margin: 0 0 20px;
    color: var(--sld-ink)
}

.course-module-heading span {
    font-weight: 400;
    font-size: 13px;
    color: var(--sld-muted)
}

.course-tabs-layout .course-list-heading {
    margin-bottom: 26px
}

.course-tabs-layout .course-unit-with-children {
    border: 1px solid #dfe6f8;
    border-radius: 18px;
    margin-bottom: 26px;
    overflow: hidden;
    background: #fff
}

.course-tabs-layout .course-unit-with-children>.sd-lesson {
    padding: 20px 24px;
    background: #f3f6ff;
    border-bottom: 1px solid #e4eafa
}

.course-tabs-layout .course-unit-with-children>.sd-lesson .sd-lesson__title {
    font-size: 19px
}

.course-tabs-layout .course-standalone {
    border-bottom: 1px solid #e7ecf5
}

.course-tabs-layout .sd-lesson-children {
    margin: 0;
    padding: 18px 24px 0;
    border-left: 0
}

.course-tabs-layout .sd-lesson-child {
    padding: 24px 16px;
    gap: 20px
}

.course-tabs-layout .sd-lesson-child__main {
    flex: 1;
    min-width: 0;
    gap: 16px
}

.course-tabs-layout .sd-lesson-child__actions {
    flex-wrap: wrap;
    gap: 8px;
    justify-content: flex-end
}

.course-tabs-layout .sd-lesson-child__title {
    font-weight: 600;
    font-size: 17px;
    line-height: 1.6;
    color: var(--sld-ink)
}

.course-tabs-layout .course-standalone .sd-lesson__left {
    gap: 16px
}

.course-teach-toggle {
    position: relative;
    display: inline-flex;
    flex: none;
    width: 26px;
    height: 26px;
    margin: 0;
    cursor: pointer
}

.course-teach-toggle input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    margin: 0;
    opacity: 0;
    cursor: pointer
}

.course-teach-toggle span {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    border: 2px solid #ccd5e3;
    border-radius: 50%;
    background: #fff;
    color: transparent;
    font-size: 17px;
    font-weight: 700;
    pointer-events: none
}

.course-teach-toggle input:checked+span {
    border-color: #1f8a5b;
    background: #1f8a5b;
    color: #fff
}

.course-teach-toggle input:focus-visible+span {
    outline: 3px solid #8fabff;
    outline-offset: 4px
}

.course-teach-toggle input:disabled+span {
    opacity: .5
}

.course-row-taught .sd-lesson-child__title {
    color: #58766a
}

.course-tabs-layout .sd-lesson-child.course-row-today {
    box-shadow: none;
    border-left: 0;
    background: #f7f9ff;
    padding-left: 16px;
    padding-right: 16px;
    border-radius: 12px
}

.course-tabs-layout .sd-lesson.course-row-today {
    background: #f7f9ff;
    box-shadow: inset 3px 0 0 var(--sld-brand)
}

.course-today {
    margin: 28px 0 34px;
    padding: 26px 30px;
    border: 1px solid #b5e0c9;
    border-radius: 22px;
    background: linear-gradient(135deg, #e6f6ed, #f5fbf8 60%, #fff)
}

.course-today-main {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px 18px
}

.course-today-badge {
    grid-column: 1;
    align-self: center;
    justify-self: start;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #1f8a5b;
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: 99px
}

.course-today-badge:before {
    content: '';
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #b5f0d0
}

.course-today-title {
    grid-column: 1/-1;
    font-size: 24px;
    line-height: 1.5;
    letter-spacing: -.02em;
    margin: 4px 0 0;
    color: var(--sld-ink)
}

.course-today-summary {
    grid-column: 1/-1;
    color: #5c7267;
    line-height: 1.7;
    font-size: 15px;
    margin: 0
}

.course-today-summary:empty {
    display: none
}

.course-today-actions {
    grid-column: 2;
    grid-row: 1;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap
}

.course-today-actions button {
    border: 1px solid #d3d7de;
    border-radius: 99px;
    padding: 11px 20px;
    background: #fff;
    color: var(--sld-ink);
    font: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer
}

.course-today-actions .course-today-done {
    background: var(--sld-brand);
    background: linear-gradient(180deg, #537bcf, #183ab5 60%, #3526ad);
    color: #fff;
    border: 2px solid #6689eb;
    box-shadow: inset 0 1px 2px #ffffff66
}

.course-today-actions .course-today-jump {
    border-color: #bdd0ff;
    background: #eef3ff;
    color: var(--sld-brand)
}

.course-today-progress {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
    color: #63766c;
    font-size: 14px
}

.course-today-bar {
    width: 76px;
    height: 6px;
    border-radius: 99px;
    background: #cfeadb;
    overflow: hidden
}

.course-today-bar i {
    display: block;
    height: 100%;
    background: #1f8a5b;
    border-radius: inherit
}

.course-teaching-feedback {
    font-size: 12px;
    margin: 10px 0 0;
    color: #647a6e;
    min-height: 0
}

.course-teaching-feedback:empty {
    display: none
}

.course-demo-preview {
    margin: 30px 0;
    padding: 24px;
    border: 1px dashed #aabded;
    border-radius: 22px;
    background: #fff
}

.course-demo-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 18px
}

.course-demo-heading h2 {
    font-size: 20px;
    margin: 8px 0 0;
    color: var(--sld-ink)
}

.course-demo-heading p {
    font-size: 13px;
    color: var(--sld-muted);
    margin: 0
}

.course-demo-tag,
.course-session-chip {
    display: inline-flex;
    font-size: 12px;
    font-weight: 600;
    color: var(--sld-brand);
    background: #e9eeff;
    border-radius: 7px;
    padding: 5px 10px;
    white-space: nowrap
}

.course-demo-card {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px
}

.course-demo-path {
    font-size: 12px;
    color: var(--sld-muted)
}

.course-demo-card h3 {
    margin: 4px 0
}

.course-demo-card .course-session-content {
    flex-basis: 100%
}

.course-tabs-layout .course-session-blocks {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px
}

.course-tabs-layout .course-session-blocks section {
    min-width: 0;
    padding: 18px;
    border: 1px solid #e4e9f5;
    border-radius: 12px;
    background: #fff
}

.course-tabs-layout .course-session-blocks section:last-child:nth-child(odd) {
    grid-column: 1/-1
}

.course-tabs-layout .course-session-content>summary {
    color: var(--sld-brand);
    font-weight: 600
}

@media(max-width:850px) {
    .course-today-main {
        grid-template-columns: 1fr
    }

    .course-today-actions {
        grid-column: 1;
        grid-row: 4
    }

    .course-today-title {
        font-size: 21px
    }

    .course-today {
        padding: 22px
    }

    .course-module-heading,
    .course-demo-heading {
        align-items: start;
        flex-direction: column;
        gap: 8px
    }

    .course-tabs-layout .course-session-blocks {
        grid-template-columns: 1fr
    }

    .course-tabs-layout .sd-lesson-child {
        flex-wrap: wrap
    }

    .course-tabs-layout .sd-lesson-child__actions {
        width: 100%;
        justify-content: flex-start;
        padding-left: 42px
    }

    .course-tabs-layout .sd-lesson-child__file {
        display: none
    }
}

@media(max-width:540px) {
    .course-module-tabs button {
        min-width: 150px;
        padding: 13px 16px
    }

    .course-module-tab-label {
        font-size: 15px
    }

    .course-tabs-layout .course-unit-with-children>.sd-lesson {
        padding: 18px
    }

    .course-tabs-layout .sd-lesson-children {
        padding: 16px 16px 0
    }

    .course-today {
        padding: 18px;
        border-radius: 18px
    }

    .course-today-title {
        font-size: 19px
    }

    .course-today-actions button {
        padding: 10px 14px;
        font-size: 13px
    }

    .course-demo-preview {
        padding: 18px
    }

    .course-tabs-layout .course-introduction {
        padding: 16px;
        font-size: 14px
    }

    .course-tabs-layout .sd-lesson-child__title {
        font-size: 16px
    }
}

.course-module-tabs button,
.course-today-actions button {
    text-transform: none;
    letter-spacing: normal
}

.course-plan-dialog header button {
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    flex: none
}

.course-row-today-chip {
    flex: none;
    display: inline-flex;
    padding: 4px 9px;
    border-radius: 6px;
    background: #e5ecff;
    color: var(--sld-brand);
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap
}

@media(max-width:540px) {
    .course-row-today-chip {
        font-size: 11px;
        padding: 4px 7px
    }

    .course-tabs-layout .sd-lesson-child__main {
        flex-wrap: wrap
    }

    .course-tabs-layout .sd-lesson-child__main>div {
        flex: 1;
        min-width: 160px
    }
}

/* Compact Module pills sit with search directly before the content list. */
.course-tabs-layout .course-content-tools {
    margin: 30px 0 26px;
    padding: 20px;
    border: 1px solid #e3e9f6;
    border-radius: 18px;
    background: #fff
}

.course-module-tabs {
    gap: 8px;
    margin: 0 0 16px;
    padding: 3px 2px 8px
}

.course-module-tabs button {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    max-width: none;
    min-height: 44px;
    padding: 10px 16px;
    border: 1px solid #e0e6f3;
    border-radius: 12px;
    background: #fff;
    color: var(--sld-muted);
    box-shadow: none;
    white-space: nowrap;
    transition: background .15s, border-color .15s
}

.course-module-tabs button[aria-selected=true] {
    background: var(--sld-brand);
    border-color: var(--sld-brand);
    color: #fff;
    box-shadow: none
}

.course-module-tab-label {
    font-size: 14px;
    font-weight: 600;
    line-height: 1.5;
    gap: 0
}

.course-module-tab-label i {
    display: none
}

.course-module-tabs small {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    margin: 0;
    padding: 0 6px;
    border-radius: 7px;
    background: #edf2fa;
    color: #60738e;
    font-size: 12px;
    font-weight: 600
}

.course-module-tabs button[aria-selected=true] small {
    background: #ffffff26;
    color: #fff
}

.course-module-tab-lock {
    font-size: 11px;
    opacity: .8
}

.course-module-tabs button:focus-visible {
    outline: 3px solid #9db8ff;
    outline-offset: 3px
}

.course-tabs-layout .course-content-tools>h2 {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0
}

@media(hover:hover) {
    .course-module-tabs button:not([aria-selected=true]):hover {
        background: #f4f7ff;
        border-color: #b7c9f6
    }
}

@media(max-width:540px) {
    .course-tabs-layout .course-content-tools {
        padding: 14px;
        border-radius: 14px;
        margin: 24px 0
    }

    .course-module-tabs button {
        padding: 9px 12px;
        gap: 8px
    }

    .course-module-tab-label {
        font-size: 13px
    }
}

@media(prefers-reduced-motion:reduce) {
    .course-module-tabs button {
        transition: none
    }
}