/* ============================================================
   LMS Modern Theme — Bootstrap 5.3 Color Mode + Custom Layer
   ============================================================ */

/* --- CSS Custom Properties (Light defaults) --- */
:root,
[data-bs-theme="light"] {
    --lms-body-bg: #f0f2f5;
    --lms-surface: #ffffff;
    --lms-surface-hover: #f8f9fa;
    --lms-border: #e2e6ea;
    --lms-border-light: #eef0f2;
    --lms-text-primary: #1a1d21;
    --lms-text-secondary: #5c636a;
    --lms-text-muted: #8b929a;
    --lms-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --lms-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --lms-shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.1);
    --lms-navbar-bg: #ffffff;
    --lms-navbar-border: #e2e6ea;
    --lms-navbar-text: #1a1d21;
    --lms-navbar-text-muted: #5c636a;
    --lms-accent: #4f6df5;
    --lms-accent-hover: #3d5bd9;
    --lms-accent-subtle: #eef1fe;
    --lms-footer-bg: #f8f9fa;
    --lms-footer-text: #8b929a;
    --lms-footer-border: #e2e6ea;
    --lms-card-border: #e8ebee;
    --lms-table-hover-bg: #f8f9fa;
    --lms-input-bg: #ffffff;
    --lms-input-border: #ced4da;
    --lms-badge-subtle-bg: #f0f2f5;
    --lms-code-bg: #f4f5f7;
}

[data-bs-theme="dark"] {
    --lms-body-bg: #111318;
    --lms-surface: #1a1d24;
    --lms-surface-hover: #22262e;
    --lms-border: #2d3139;
    --lms-border-light: #252930;
    --lms-text-primary: #e4e6ea;
    --lms-text-secondary: #9da3ad;
    --lms-text-muted: #6c737e;
    --lms-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --lms-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
    --lms-shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.3);
    --lms-navbar-bg: #1a1d24;
    --lms-navbar-border: #2d3139;
    --lms-navbar-text: #e4e6ea;
    --lms-navbar-text-muted: #9da3ad;
    --lms-accent: #6b85f7;
    --lms-accent-hover: #8da0fa;
    --lms-accent-subtle: #1e2340;
    --lms-footer-bg: #1a1d24;
    --lms-footer-text: #6c737e;
    --lms-footer-border: #2d3139;
    --lms-card-border: #2d3139;
    --lms-table-hover-bg: #22262e;
    --lms-input-bg: #22262e;
    --lms-input-border: #3a3f48;
    --lms-badge-subtle-bg: #22262e;
    --lms-code-bg: #22262e;
}

/* --- Base --- */
body {
    background-color: var(--lms-body-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--lms-text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.2s ease, color 0.2s ease;
}

main {
    flex: 1;
}

/* --- Navbar --- */
.navbar {
    background-color: var(--lms-navbar-bg) !important;
    border-bottom: 1px solid var(--lms-navbar-border);
    box-shadow: var(--lms-shadow-sm);
    padding-top: 0.65rem;
    padding-bottom: 0.65rem;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--lms-accent) !important;
    letter-spacing: -0.01em;
}

.navbar-brand:hover {
    color: var(--lms-accent-hover) !important;
}

.navbar .nav-link {
    color: var(--lms-navbar-text-muted) !important;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.5rem 0.85rem !important;
    border-radius: 0.5rem;
    transition: color 0.15s, background-color 0.15s;
}

.navbar .nav-link:hover,
.navbar .nav-link:focus {
    color: var(--lms-accent) !important;
    background-color: var(--lms-accent-subtle);
}

.navbar .nav-link.active {
    color: var(--lms-accent) !important;
    background-color: var(--lms-accent-subtle);
}

.navbar-toggler {
    border: 1px solid var(--lms-border);
    padding: 0.35rem 0.6rem;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(90,100,115,0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

[data-bs-theme="dark"] .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(180,190,200,0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* --- Theme Toggle --- */
.theme-toggle {
    background: none;
    border: 1px solid var(--lms-border);
    border-radius: 0.5rem;
    padding: 0.35rem 0.55rem;
    cursor: pointer;
    color: var(--lms-text-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: color 0.15s, background-color 0.15s, border-color 0.15s;
    line-height: 1;
}

.theme-toggle:hover {
    background-color: var(--lms-accent-subtle);
    color: var(--lms-accent);
    border-color: var(--lms-accent);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

/* --- Logout button in navbar --- */
.btn-nav-logout {
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.35rem 0.75rem;
    border-radius: 0.5rem;
    border: 1px solid var(--lms-border);
    color: var(--lms-text-secondary);
    background: transparent;
    transition: all 0.15s;
}

.btn-nav-logout:hover {
    border-color: var(--bs-danger);
    color: var(--bs-danger);
    background-color: rgba(var(--bs-danger-rgb), 0.08);
}

/* --- Page Headers --- */
.page-header {
    margin-bottom: 1.5rem;
}

.page-header h2 {
    font-weight: 700;
    font-size: 1.6rem;
    letter-spacing: -0.02em;
    color: var(--lms-text-primary);
    margin-bottom: 0;
}

.page-header .page-subtitle {
    color: var(--lms-text-muted);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

/* --- Cards --- */
.card {
    border: 1px solid var(--lms-card-border);
    border-radius: 0.75rem;
    box-shadow: var(--lms-shadow-sm);
    background-color: var(--lms-surface);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--lms-border-light);
    padding: 1rem 1.25rem;
    font-weight: 600;
}

.card-header strong {
    font-weight: 600;
}

.card-body {
    padding: 1.25rem;
}

.card-title {
    font-weight: 600;
    color: var(--lms-text-primary);
}

/* Course cards */
.course-card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    height: 100%;
    border: 1px solid var(--lms-card-border);
}

.course-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--lms-shadow-lg);
}

.course-card .card-body {
    display: flex;
    flex-direction: column;
}

.course-card .btn {
    margin-top: auto;
}

.course-category {
    color: var(--lms-text-muted);
    font-size: 0.8rem;
    font-weight: 500;
    text-align: left;
}

/* --- Tables --- */
.table {
    --bs-table-bg: transparent;
    font-size: 0.9rem;
}

.table > thead > tr > th {
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--lms-text-muted);
    border-bottom-width: 1px;
    border-bottom-color: var(--lms-border);
    padding: 0.75rem 1rem;
    white-space: nowrap;
}

.table > tbody > tr > td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
    border-bottom-color: var(--lms-border-light);
    color: var(--lms-text-primary);
}

.table-hover > tbody > tr:hover > td {
    background-color: var(--lms-table-hover-bg);
}

.table > thead.table-light > tr > th {
    background-color: var(--lms-badge-subtle-bg);
    color: var(--lms-text-muted);
}

/* --- Buttons --- */
.btn {
    font-weight: 500;
    border-radius: 0.5rem;
    font-size: 0.9rem;
    padding: 0.45rem 1rem;
    transition: all 0.15s ease;
}

.btn-sm {
    padding: 0.3rem 0.7rem;
    font-size: 0.8rem;
    border-radius: 0.4rem;
}

.btn-primary {
    background-color: var(--lms-accent);
    border-color: var(--lms-accent);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--lms-accent-hover);
    border-color: var(--lms-accent-hover);
}

.btn-outline-primary {
    color: var(--lms-accent);
    border-color: var(--lms-accent);
}

.btn-outline-primary:hover,
.btn-outline-primary.active {
    background-color: var(--lms-accent);
    border-color: var(--lms-accent);
    color: #fff;
}

.btn-outline-secondary {
    color: var(--lms-text-secondary);
    border-color: var(--lms-border);
}

.btn-outline-secondary:hover {
    background-color: var(--lms-surface-hover);
    border-color: var(--lms-border);
    color: var(--lms-text-primary);
}

/* --- Forms --- */
.form-control,
.form-select {
    border-radius: 0.5rem;
    border-color: var(--lms-input-border);
    background-color: var(--lms-input-bg);
    color: var(--lms-text-primary);
    font-size: 0.9rem;
    padding: 0.5rem 0.85rem;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--lms-accent);
    box-shadow: 0 0 0 3px rgba(79, 109, 245, 0.15);
}

.form-label {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--lms-text-secondary);
    margin-bottom: 0.35rem;
}

.form-text {
    font-size: 0.8rem;
    color: var(--lms-text-muted);
}

.form-check-input:checked {
    background-color: var(--lms-accent);
    border-color: var(--lms-accent);
}

.form-check-input:focus {
    border-color: var(--lms-accent);
    box-shadow: 0 0 0 3px rgba(79, 109, 245, 0.15);
}

/* --- Badges --- */
.badge {
    font-weight: 500;
    font-size: 0.75rem;
    padding: 0.35em 0.65em;
    border-radius: 0.4rem;
    letter-spacing: 0.01em;
}
[data-bs-theme="dark"] .badge.bg-info {
    background-color: #2fb8cc !important;
    color: #fff !important;
}
[data-bs-theme="dark"] .badge.bg-primary {
    background-color: #5a8dee !important;
    color: #fff !important;
}
[data-bs-theme="dark"] .table-info {
    --bs-table-bg: #1a2a35;
    --bs-table-hover-bg: #1f3240;
    --bs-table-border-color: #2d3139;
    --bs-table-color: var(--lms-text-primary);
}

/* --- AI Status Badges & Row Highlights --- */
.badge-ai-pending {
    background-color: #6c757d;
    color: #fff;
}
.badge-ai-ready {
    background-color: #0d6efd;
    color: #fff;
}
.badge-ai-rejected {
    background-color: #6c757d;
    color: #fff;
}
.table-ai-ready {
    --bs-table-bg: #e8f0fe;
    --bs-table-hover-bg: #dce6f8;
    --bs-table-border-color: #c5d4ed;
}
[data-bs-theme="dark"] .badge-ai-pending {
    background-color: #495057;
    color: #dee2e6;
}
[data-bs-theme="dark"] .badge-ai-ready {
    background-color: #3d7bee;
    color: #fff;
}
[data-bs-theme="dark"] .badge-ai-rejected {
    background-color: #495057;
    color: #dee2e6;
}
[data-bs-theme="dark"] .table-ai-ready {
    --bs-table-bg: #1a2540;
    --bs-table-hover-bg: #1f2d4a;
    --bs-table-border-color: #2d3139;
    --bs-table-color: var(--lms-text-primary);
}

/* --- Alerts --- */
.alert {
    border-radius: 0.625rem;
    font-size: 0.9rem;
    border: none;
}

/* --- Breadcrumbs --- */
.breadcrumb {
    font-size: 0.85rem;
    padding: 0;
    margin-bottom: 1rem;
    background: none;
}

.breadcrumb-item a {
    color: var(--lms-accent);
    text-decoration: none;
}

.breadcrumb-item a:hover {
    text-decoration: underline;
}

.breadcrumb-item.active {
    color: var(--lms-text-muted);
}

.breadcrumb-item + .breadcrumb-item::before {
    color: var(--lms-text-muted);
}

/* --- Pagination --- */
.pagination {
    gap: 0.2rem;
}

.page-link {
    border-radius: 0.4rem !important;
    border: 1px solid var(--lms-border);
    color: var(--lms-text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.4rem 0.75rem;
    background-color: var(--lms-surface);
    transition: all 0.15s;
}

.page-link:hover {
    background-color: var(--lms-accent-subtle);
    color: var(--lms-accent);
    border-color: var(--lms-accent);
}

.page-item.active .page-link {
    background-color: var(--lms-accent);
    border-color: var(--lms-accent);
    color: #fff;
}

.page-item.disabled .page-link {
    background-color: var(--lms-surface);
    border-color: var(--lms-border-light);
    color: var(--lms-text-muted);
}

/* --- Accordion (Course sections) --- */
.section-accordion .accordion-item {
    border: 1px solid var(--lms-border-light);
    border-radius: 0.625rem !important;
    margin-bottom: 0.5rem;
    overflow: hidden;
    background-color: var(--lms-surface);
}

.section-accordion .accordion-button {
    font-weight: 600;
    font-size: 0.95rem;
    background-color: var(--lms-surface);
    color: var(--lms-text-primary);
    padding: 0.85rem 1.15rem;
    border-radius: 0.625rem;
}

.section-accordion .accordion-button:not(.collapsed) {
    background-color: var(--lms-accent-subtle);
    color: var(--lms-accent);
    box-shadow: none;
}

.section-accordion .accordion-button:focus {
    box-shadow: none;
    border-color: var(--lms-border);
}

.section-accordion .accordion-body {
    padding: 0.5rem 0;
}

/* --- List Groups --- */
.list-group-item {
    border-color: var(--lms-border-light);
    background-color: transparent;
    color: var(--lms-text-primary);
    padding: 0.75rem 1.15rem;
    transition: background-color 0.15s;
}

.list-group-item:hover,
.list-group-item-action:hover {
    background-color: var(--lms-surface-hover);
}

/* --- Login/Auth Container --- */
.login-container {
    max-width: 420px;
    margin: 6vh auto;
}

.login-container .card {
    border: none;
    box-shadow: var(--lms-shadow-lg);
    border-radius: 1rem;
}

.login-container .card-body {
    padding: 2rem 2rem 1.75rem;
}

.login-container .card-title {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* --- Lesson Styles --- */
.lesson-content img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
}

.lesson-content video {
    max-width: 100%;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    max-width: 100%;
    border-radius: 0.75rem;
}

.video-container iframe,
.video-container video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.lesson-deleted {
    opacity: 0.5;
    background-color: var(--lms-badge-subtle-bg);
}

.lesson-title-link {
    text-decoration: none;
    color: var(--lms-text-primary);
    font-weight: 500;
    transition: color 0.15s;
}

.lesson-title-link:hover {
    color: var(--lms-accent);
    text-decoration: none;
}

.lesson-rename-input {
    max-width: 400px;
}

/* --- Footer --- */
footer {
    background-color: var(--lms-footer-bg);
    border-top: 1px solid var(--lms-footer-border);
    color: var(--lms-footer-text);
    padding: 1rem 0;
    margin-top: auto;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

/* --- Filter Chips (Category pills) --- */
.filter-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.filter-chips .btn {
    border-radius: 2rem;
    padding: 0.3rem 0.85rem;
    font-size: 0.8rem;
}

/* --- Code --- */
code {
    background-color: var(--lms-code-bg);
    padding: 0.15em 0.4em;
    border-radius: 0.3rem;
    font-size: 0.85em;
    color: var(--lms-text-primary);
}

/* --- Dropdowns --- */
.dropdown-menu {
    border: 1px solid var(--lms-border);
    border-radius: 0.625rem;
    box-shadow: var(--lms-shadow);
    padding: 0.35rem;
    background-color: var(--lms-surface);
}

.dropdown-item {
    border-radius: 0.4rem;
    font-size: 0.9rem;
    padding: 0.45rem 0.75rem;
    color: var(--lms-text-primary);
}

.dropdown-item:hover {
    background-color: var(--lms-surface-hover);
}

/* --- Scrollbar (subtle) --- */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--lms-border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--lms-text-muted);
}

/* --- Definition Lists --- */
dl.row > dt {
    font-weight: 500;
    color: var(--lms-text-muted);
    font-size: 0.875rem;
}

dl.row > dd {
    color: var(--lms-text-primary);
    font-size: 0.9rem;
}

/* --- Review Cards --- */
.review-card {
    border: 1px solid var(--lms-border-light);
    border-radius: 0.625rem;
    padding: 1rem 1.15rem;
    margin-bottom: 0.65rem;
    background-color: var(--lms-surface);
    transition: background-color 0.15s;
}

.review-card:hover {
    background-color: var(--lms-surface-hover);
}

/* --- Empty States --- */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--lms-text-muted);
}

.empty-state-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    opacity: 0.5;
}

.empty-state-text {
    font-size: 0.95rem;
    font-weight: 500;
}

/* --- Status Dot --- */
.status-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 0.4rem;
    vertical-align: middle;
}

.status-dot-success {
    background-color: var(--bs-success);
}

.status-dot-danger {
    background-color: var(--bs-danger);
}

/* --- Clickable Row --- */
.clickable-row {
    cursor: pointer;
    transition: background-color 0.15s;
}

.clickable-row:hover > td {
    background-color: var(--lms-table-hover-bg);
}

/* --- Modal --- */
.modal-content {
    border: 1px solid var(--lms-border);
    border-radius: 0.75rem;
    box-shadow: var(--lms-shadow-lg);
    background-color: var(--lms-surface);
}

/* --- Responsive --- */
@media (max-width: 767.98px) {
    .page-header h2 {
        font-size: 1.35rem;
    }

    .card-body {
        padding: 1rem;
    }

    .table > thead > tr > th,
    .table > tbody > tr > td {
        padding: 0.6rem 0.65rem;
    }

    .login-container {
        margin: 2rem 0.75rem;
    }

    .login-container .card-body {
        padding: 1.5rem;
    }

    .navbar .nav-link {
        padding: 0.5rem 0.65rem !important;
    }
}

@media (min-width: 992px) {
    main > .container {
        max-width: 1100px;
    }
}

/* --- Student Progress Dashboard --- */
.progress-dashboard .dashboard-card {
    background-color: var(--lms-surface);
    border: 1px solid var(--lms-card-border);
    border-radius: 0.75rem;
    padding: 1.15rem;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.progress-dashboard .dashboard-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--lms-shadow);
}

.progress-dashboard .dashboard-icon {
    width: 34px;
    height: 34px;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    flex-shrink: 0;
    margin-bottom: 0.2rem;
}

.progress-dashboard .dashboard-value {
    display: flex;
    align-items: baseline;
    gap: 0.15rem;
}

.progress-dashboard .dashboard-number {
    font-size: 1.65rem;
    font-weight: 700;
    line-height: 1.1;
    color: var(--lms-text-primary);
}

.progress-dashboard .dashboard-total {
    font-size: 0.9rem;
    color: var(--lms-text-muted);
    font-weight: 500;
}

.progress-dashboard .dashboard-label {
    font-size: 0.8rem;
    color: var(--lms-text-muted);
    font-weight: 500;
    line-height: 1.3;
}

@media (max-width: 767.98px) {
    .progress-dashboard .dashboard-number {
        font-size: 1.35rem;
    }
    .progress-dashboard .dashboard-card {
        padding: 0.85rem;
    }
}

/* --- Homework Status Indicators --- */
.homework-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.2em 0.55em;
    border-radius: 0.4rem;
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
}

.homework-status-badge.submitted {
    background-color: rgba(var(--bs-success-rgb), 0.12);
    color: var(--bs-success);
}

.homework-status-badge.reviewed {
    background-color: rgba(var(--bs-success-rgb), 0.12);
    color: var(--bs-success);
}

[data-bs-theme="dark"] .homework-status-badge.submitted {
    background-color: rgba(25, 135, 84, 0.2);
}

[data-bs-theme="dark"] .homework-status-badge.reviewed {
    background-color: rgba(25, 135, 84, 0.2);
}

/* --- Grade/Feedback Block on homework detail --- */
.grade-feedback-card {
    border: 2px solid var(--bs-success);
    border-radius: 0.75rem;
    overflow: hidden;
}

.grade-feedback-card .card-header {
    background-color: rgba(var(--bs-success-rgb), 0.08);
    border-bottom: 1px solid rgba(var(--bs-success-rgb), 0.15);
}

.grade-display {
    font-size: 2rem;
    font-weight: 700;
    color: var(--lms-text-primary);
    line-height: 1;
}

.grade-display .grade-max {
    font-size: 1rem;
    color: var(--lms-text-muted);
    font-weight: 500;
}

.grade-display-inline {
    font-weight: 700;
}

.feedback-block {
    background-color: var(--lms-badge-subtle-bg);
    border-left: 3px solid var(--lms-accent);
    border-radius: 0 0.5rem 0.5rem 0;
    padding: 0.85rem 1rem;
    font-size: 0.9rem;
    color: var(--lms-text-primary);
    line-height: 1.6;
}

/* --- Transition helper (prevent flash on load) --- */
.theme-transition,
.theme-transition *,
.theme-transition *::before,
.theme-transition *::after {
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease !important;
}

/* --- Google Auth Button --- */
.btn-google {
    background-color: var(--lms-surface);
    border: 1px solid var(--lms-border);
    color: var(--lms-text-primary);
    font-weight: 500;
    padding: 0.55rem 1rem;
    border-radius: 0.5rem;
    gap: 0.5rem;
    transition: background-color 0.15s ease, box-shadow 0.15s ease;
    text-decoration: none;
}

.btn-google:hover {
    background-color: var(--lms-surface-hover);
    box-shadow: var(--lms-shadow-sm);
    color: var(--lms-text-primary);
    text-decoration: none;
}

.btn-google .google-icon {
    flex-shrink: 0;
}

/* --- Login Divider --- */
.divider-text {
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--lms-text-muted);
    font-size: 0.85rem;
}

.divider-text::before,
.divider-text::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--lms-border);
}

.divider-text span {
    padding: 0 0.75rem;
}

/* --- NPS Widget --- */
.nps-widget-bubble {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1050;
}

.nps-bubble-btn {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    font-size: 1.5rem;
    transition: transform 0.2s ease;
}

.nps-bubble-btn:hover {
    transform: scale(1.1);
}

.nps-dismiss-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 22px;
    height: 22px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--lms-surface);
    border: 1px solid var(--lms-border);
    border-radius: 50%;
    color: var(--lms-text-muted);
    text-decoration: none;
}

.nps-dismiss-btn:hover {
    color: var(--lms-text-primary);
    background: var(--lms-surface-hover);
}

.nps-rating-btn {
    width: 38px;
    height: 38px;
    padding: 0;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 50% !important;
}

@media (max-width: 575.98px) {
    .nps-widget-bubble {
        bottom: 16px;
        right: 16px;
    }
    .nps-bubble-btn {
        width: 48px;
        height: 48px;
    }
    .nps-rating-btn {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
    }
}

/* --- Last Visited Lesson Highlight --- */
.lesson-last-visited {
    border-left: 3px solid var(--lms-accent) !important;
    background-color: var(--lms-accent-subtle) !important;
}

/* --- Lesson Prev/Next Navigation --- */
.lesson-nav {
    gap: 0.5rem;
}

.lesson-nav .btn {
    white-space: nowrap;
}

@media (max-width: 575.98px) {
    .lesson-nav {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    .lesson-nav > div {
        flex: 1 1 auto;
        text-align: center;
    }
    .lesson-nav .btn {
        width: 100%;
    }
}

/* --- Navbar Management Dropdown --- */
.navbar .dropdown-toggle::after {
    margin-left: 0.3em;
}

.navbar .dropdown-menu {
    min-width: 10rem;
}