/* ==========================================================================
   ExamTube - Frontend Course Module Stylesheet (Vanilla CSS, Modern UI/UX)
   ========================================================================== */

:root {
    --course-primary: #0f766e;
    --course-primary-dark: #0d5f58;
    --course-primary-light: #14b8a6;
    --course-primary-50: #f0fdfa;
    --course-primary-100: #ccfbf1;
    --course-primary-900: #134e4a;
    --course-card-bg: #ffffff;
    --course-card-border: #e2e8f0;
    --course-text-main: #0f172a;
    --course-text-muted: #64748b;
    --course-tree-line: #cbd5e1;
}

.dark {
    --course-card-bg: #1e293b;
    --course-card-border: #334155;
    --course-text-main: #f8fafc;
    --course-text-muted: #94a3b8;
    --course-tree-line: #475569;
}

/* Ensure all SVG icons inside course modules have strict default sizing */
.course-hero svg,
.course-layout svg,
.course-sidebar-card svg,
.course-tree-item svg,
.course-toc-item svg,
.course-tab-btn svg,
.course-exam-card svg,
.course-feature-item svg,
.course-download-card svg,
.course-stat-card svg,
.course-mobile-bar svg {
    width: 1.125rem;
    height: 1.125rem;
    max-width: 1.125rem;
    max-height: 1.125rem;
    flex-shrink: 0;
    display: inline-block;
    vertical-align: middle;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.course-hero {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 50%, #e2e8f0 100%);
    border-bottom: 1px solid #e2e8f0;
    padding: 1.5rem 0 1.35rem;
    position: relative;
    overflow: hidden;
}

.dark .course-hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    border-bottom-color: #334155;
}

.course-hero::before {
    content: '';
    position: absolute;
    top: -80px;
    right: -80px;
    width: 320px;
    height: 320px;
    background: radial-gradient(circle, rgba(15, 118, 110, 0.12) 0%, transparent 70%);
    border-radius: 9999px;
    pointer-events: none;
}

.course-hero__breadcrumbs {
    margin-bottom: 1rem;
}

.course-hero__badges {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.625rem;
    margin-bottom: 0.875rem;
}

.course-badge-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.65rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.course-badge-pill--category {
    background: #e0f2fe;
    color: #0369a1;
    border: 1px solid #bae6fd;
}

.dark .course-badge-pill--category {
    background: rgba(3, 105, 161, 0.2);
    color: #7dd3fc;
    border-color: rgba(125, 211, 252, 0.2);
}

.course-badge-pill--level {
    background: #f1f5f9;
    color: #475569;
    border: 1px solid #e2e8f0;
}

.dark .course-badge-pill--level {
    background: rgba(51, 65, 85, 0.4);
    color: #cbd5e1;
    border-color: #475569;
}

.course-badge-pill--verified {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.dark .course-badge-pill--verified {
    background: rgba(22, 101, 52, 0.25);
    color: #86efac;
    border-color: rgba(134, 239, 172, 0.2);
}

.course-hero__title {
    font-size: clamp(1.55rem, 4vw, 2.15rem);
    font-weight: 800;
    line-height: 1.25;
    color: var(--course-text-main);
    margin: 0 0 0.75rem;
    letter-spacing: -0.025em;
    max-width: 52rem;
    overflow-wrap: anywhere;
}

.course-hero__lead {
    font-size: 1rem;
    line-height: 1.55;
    color: var(--course-text-muted);
    max-width: 52rem;
    margin: 0 0 1rem;
    overflow-wrap: anywhere;
}

.course-hero__meta-strip {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.65rem 1rem;
    font-size: 0.8125rem;
    color: var(--course-text-muted);
    padding-top: 0.5rem;
    border-top: 1px solid rgba(226, 232, 240, 0.8);
}

.dark .course-hero__meta-strip {
    border-top-color: rgba(51, 65, 85, 0.6);
}

.course-hero__meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.course-hero__meta-item svg {
    color: var(--course-primary);
}

.course-hero__rating-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: #d97706;
    font-weight: 700;
    text-decoration: none;
    transition: opacity 0.15s ease;
}

.course-hero__rating-link:hover {
    opacity: 0.85;
    text-decoration: underline;
}

/* --------------------------------------------------------------------------
   Page shell (match Blog detail: et-article__shell / et-article__layout)
   -------------------------------------------------------------------------- */
.course-page {
    width: 100%;
    max-width: 100%;
    overflow-x: clip;
}

.course-page .course-shell {
    width: min(100% - 2rem, 1440px);
    max-width: none;
    margin-inline: auto;
    box-sizing: border-box;
}

@media (max-width: 640px) {
    .course-page .course-shell {
        width: min(100% - 1.25rem, 1440px);
    }
}

/* --------------------------------------------------------------------------
   Layout Grid (Primary Content & Sticky Sidebar)
   -------------------------------------------------------------------------- */
.course-main-wrapper {
    padding: 1.25rem 0 3.5rem;
    width: 100%;
    max-width: 100%;
    overflow-x: clip;
}

.course-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
    width: 100%;
    max-width: 100%;
}

.course-primary-col,
.course-sidebar-col {
    min-width: 0;
    max-width: 100%;
}

.course-primary-col {
    display: flex;
    flex-direction: column;
    gap: 0;
}

@media (min-width: 1100px) {
    .course-layout {
        grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
        gap: 1.75rem 2rem;
    }

    .course-sidebar-col {
        position: sticky;
        top: calc(var(--et-header-h, 72px) + 1rem);
        align-self: start;
    }
}

/* --------------------------------------------------------------------------
   Course Banner & Media Card
   -------------------------------------------------------------------------- */
.course-media-box {
    margin-bottom: 1.25rem;
    border-radius: 1rem;
    overflow: hidden;
    border: 1px solid var(--course-card-border);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    background: #0f172a;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

.course-media-box img {
    width: 100%;
    height: auto;
    max-height: 420px;
    object-fit: cover;
    display: block;
}

.course-media-placeholder {
    padding: 3rem 2rem;
    background: linear-gradient(135deg, #0f766e 0%, #1e293b 100%);
    color: #ffffff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.course-media-placeholder__icon {
    width: 3.5rem;
    height: 3.5rem;
    max-width: 3.5rem;
    max-height: 3.5rem;
    margin-bottom: 1rem;
    color: #2dd4bf;
}

.course-media-placeholder__title {
    font-size: 1.35rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 0.5rem;
}

.course-media-placeholder__subtitle {
    font-size: 0.875rem;
    color: #99f6e4;
    max-width: 28rem;
}

/* --------------------------------------------------------------------------
   Course Pathway Highlight Card (Alternative when no banner image)
   -------------------------------------------------------------------------- */
.course-pathway-card {
    position: relative;
    border-radius: 1rem;
    overflow: hidden;
    margin-bottom: 1.25rem;
    background: linear-gradient(135deg, #09332c 0%, #0f172a 100%);
    border: 1px solid rgba(45, 212, 191, 0.25);
    box-shadow: 0 10px 25px -5px rgba(15, 118, 110, 0.15), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
    padding: 1.25rem 1.25rem;
    color: #ffffff;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

.course-pathway-card__glow {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 280px;
    height: 280px;
    background: radial-gradient(circle, rgba(20, 184, 166, 0.25) 0%, transparent 70%);
    pointer-events: none;
    border-radius: 50%;
}

.course-pathway-card__content {
    position: relative;
    z-index: 1;
    min-width: 0;
    max-width: 100%;
}

.course-pathway-card__header {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
    min-width: 0;
}

.course-pathway-card__heading {
    min-width: 0;
    flex: 1;
}

.course-pathway-card__icon-badge {
    width: 40px;
    height: 40px;
    min-width: 40px;
    border-radius: 0.65rem;
    background: rgba(45, 212, 191, 0.15);
    border: 1px solid rgba(45, 212, 191, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #2dd4bf;
}

.course-pathway-card__icon-badge svg {
    width: 20px;
    height: 20px;
}

.course-pathway-card__pill {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #2dd4bf;
    margin-bottom: 0.2rem;
}

.course-pathway-card__title {
    font-size: clamp(0.95rem, 2.8vw, 1.1rem);
    font-weight: 700;
    color: #ffffff;
    margin: 0;
    letter-spacing: -0.01em;
    line-height: 1.35;
    overflow-wrap: anywhere;
}

.course-pathway-card__grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.65rem;
}

@media (max-width: 720px) {
    .course-pathway-card__grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

.course-pathway-card__item {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 0.65rem;
    padding: 0.7rem 0.8rem;
    min-width: 0;
    max-width: 100%;
}

.course-pathway-card__item > div {
    min-width: 0;
    flex: 1;
}

.course-pathway-card__item-dot {
    width: 8px;
    height: 8px;
    min-width: 8px;
    border-radius: 50%;
    background: #2dd4bf;
    box-shadow: 0 0 8px rgba(45, 212, 191, 0.6);
    margin-top: 0.35rem;
}

.course-pathway-card__item strong {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 0.1rem;
}

.course-pathway-card__item span {
    display: block;
    font-size: 0.75rem;
    color: #94a3b8;
    line-height: 1.35;
    overflow-wrap: anywhere;
}

/* --------------------------------------------------------------------------
   Course Tabs Navigation Bar
   -------------------------------------------------------------------------- */
.course-tabs-bar {
    position: sticky;
    top: var(--et-header-h, 72px);
    z-index: 25;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border: 1px solid var(--course-card-border);
    margin-bottom: 1rem;
    border-radius: 0.75rem;
    width: 100%;
    max-width: 100%;
    overflow: hidden;
    box-sizing: border-box;
}

.dark .course-tabs-bar {
    background: rgba(30, 41, 59, 0.95);
}

.course-tabs-scroller {
    display: flex;
    align-items: center;
    gap: 0.2rem;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.4rem;
    max-width: 100%;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
}

.course-tabs-scroller::-webkit-scrollbar {
    height: 3px;
}

.course-tabs-scroller::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 9999px;
}

.course-tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--course-text-muted);
    background: transparent;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    white-space: nowrap;
    flex: 0 0 auto;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.course-tab-btn:hover {
    color: var(--course-primary);
    background: var(--course-primary-50);
}

.dark .course-tab-btn:hover {
    background: rgba(15, 118, 110, 0.15);
    color: var(--course-primary-light);
}

.course-tab-btn.is-active {
    color: var(--course-primary);
    background: var(--course-primary-100);
    box-shadow: inset 0 0 0 1px rgba(15, 118, 110, 0.2);
}

.dark .course-tab-btn.is-active {
    color: #5eead4;
    background: rgba(15, 118, 110, 0.25);
    box-shadow: inset 0 0 0 1px rgba(94, 234, 212, 0.3);
}

.course-tab-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.35rem;
    height: 1.35rem;
    padding: 0 0.4rem;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 9999px;
    background: #e2e8f0;
    color: #475569;
    transition: all 0.2s ease;
}

.dark .course-tab-count {
    background: #334155;
    color: #cbd5e1;
}

.course-tab-btn.is-active .course-tab-count {
    background: var(--course-primary);
    color: #ffffff;
}

.dark .course-tab-btn.is-active .course-tab-count {
    background: var(--course-primary-light);
    color: #0f172a;
}

/* --------------------------------------------------------------------------
   Tab Panes
   -------------------------------------------------------------------------- */
.course-tab-pane {
    display: none;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    overflow-x: clip;
}

.course-tab-pane.is-active {
    display: block;
}

@keyframes courseSlideUp {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --------------------------------------------------------------------------
   Section Intro Card (Section 1)
   -------------------------------------------------------------------------- */
.course-section-intro {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border: 1px solid var(--course-card-border);
    border-left: 3px solid var(--course-primary);
    border-radius: 0.75rem;
    padding: 0.85rem 1rem;
    margin-bottom: 0.85rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
    max-width: 100%;
    overflow-x: clip;
    box-sizing: border-box;
}

.course-prose,
.course-section-intro .course-prose,
.course-section-intro .et-prose {
    max-width: 100%;
    overflow-wrap: anywhere;
    word-break: break-word;
}

.course-prose img,
.course-prose table,
.course-prose iframe,
.course-prose video {
    max-width: 100% !important;
    height: auto;
}

.dark .course-section-intro {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border-color: #334155;
    border-left-color: var(--course-primary-light);
}

.course-section-intro__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.course-section-intro h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--course-text-main);
    margin: 0;
}

.course-section-intro .course-prose {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--course-text-muted);
}

/* Tree Toolbar */
.course-tree-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.65rem;
    padding: 0.15rem 0.1rem;
}

.course-tree-toolbar__count {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--course-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.course-tree-toolbar__actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.course-btn-xs {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.35rem 0.65rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 0.375rem;
    border: 1px solid var(--course-card-border);
    background: var(--course-card-bg);
    color: var(--course-text-muted);
    cursor: pointer;
    transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.course-btn-xs:hover {
    color: var(--course-primary);
    border-color: var(--course-primary);
    background: var(--course-primary-50);
}

.dark .course-btn-xs:hover {
    background: rgba(15, 118, 110, 0.2);
}

.course-tree-toggle-all {
    white-space: nowrap;
}

.course-tree-toggle-all__icon {
    width: 0.95rem !important;
    height: 0.95rem !important;
    max-width: 0.95rem !important;
    max-height: 0.95rem !important;
    flex-shrink: 0;
    transform: none !important;
}

.course-layout .course-tree-toggle-all__icon.is-hidden,
.course-tree-toggle-all__icon.is-hidden {
    display: none !important;
}

.course-tree-toggle-all__label {
    line-height: 1;
}

/* --------------------------------------------------------------------------
   Compact TOC list (Syllabus / Notes / Downloads)
   -------------------------------------------------------------------------- */
.course-toc {
    background: var(--course-card-bg);
    border: 1px solid var(--course-card-border);
    border-radius: 0.75rem;
    padding: 0.75rem 1rem 0.85rem;
    overflow: hidden;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

.course-toc__label {
    display: block;
    width: fit-content;
    margin: 0 auto 0.65rem;
    padding: 0.28rem 1.1rem;
    font-size: 0.8125rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--course-text-main);
    background: #f1f5f9;
    border-radius: 9999px;
    text-align: center;
}

.dark .course-toc__label {
    background: #334155;
    color: #f8fafc;
}

.course-toc-empty {
    padding: 1.5rem 1rem;
    text-align: center;
    color: var(--course-text-muted);
    font-size: 0.875rem;
    border: 1px dashed var(--course-card-border);
    border-radius: 0.75rem;
}

.course-toc-item {
    min-width: 0;
    max-width: 100%;
}

.course-toc-row {
    display: grid;
    grid-template-columns: 1.25rem max-content minmax(0, 1fr) max-content;
    align-items: start;
    column-gap: 0.4rem;
    padding: 0.3rem 0;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

.course-toc-item--level-0 > .course-toc-row {
    margin-top: 0.25rem;
    padding-top: 0.4rem;
}

.course-toc-item--level-0:first-child > .course-toc-row {
    margin-top: 0;
    padding-top: 0.15rem;
}

.course-toc-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.25rem;
    height: 1.25rem;
    margin-top: 0.05rem;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--course-text-muted);
    cursor: pointer;
    border-radius: 0.25rem;
}

.course-toc-toggle:hover {
    color: var(--course-primary);
    background: var(--course-primary-50);
}

.dark .course-toc-toggle:hover {
    background: rgba(15, 118, 110, 0.2);
}

.course-toc-toggle__icon {
    width: 0.875rem !important;
    height: 0.875rem !important;
    max-width: 0.875rem !important;
    max-height: 0.875rem !important;
    transition: transform 0.15s ease;
}

.course-toc-toggle.is-collapsed .course-toc-toggle__icon {
    transform: rotate(-90deg);
}

.course-toc-toggle-spacer {
    width: 1.25rem;
    height: 1.25rem;
    margin-top: 0.05rem;
}

.course-toc-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.5rem;
    height: 1.25rem;
    margin-top: 0.05rem;
    padding: 0 0.35rem;
    border-radius: 9999px;
    font-size: 0.6875rem;
    font-weight: 700;
    line-height: 1;
    letter-spacing: 0.01em;
    color: var(--course-primary-900);
    background: var(--course-primary-100);
    white-space: nowrap;
}

.dark .course-toc-num {
    color: #99f6e4;
    background: rgba(15, 118, 110, 0.28);
}

.course-toc-body {
    display: flex;
    flex-direction: column;
    gap: 0.12rem;
    min-width: 0;
    max-width: 100%;
    overflow: hidden;
}

.course-toc-title-line {
    min-width: 0;
    max-width: 100%;
    overflow: hidden;
}

.course-toc-title {
    display: block;
    max-width: 100%;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--course-text-main);
    line-height: 1.3;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.course-toc-item--level-0 > .course-toc-row .course-toc-title {
    font-weight: 700;
    font-size: 0.9rem;
}

.course-toc-item--level-1 > .course-toc-row .course-toc-title,
.course-toc-item--level-2 > .course-toc-row .course-toc-title,
.course-toc-item--level-3 > .course-toc-row .course-toc-title,
.course-toc-item--level-4 > .course-toc-row .course-toc-title {
    font-weight: 500;
}

.course-toc-title--link {
    color: var(--course-primary);
    text-decoration: none;
}

.course-toc-title--link:hover {
    text-decoration: underline;
    color: var(--course-primary-dark);
}

.dark .course-toc-title--link {
    color: var(--course-primary-light);
}

.course-toc-desc {
    display: block;
    margin: 0;
    max-width: 100%;
    font-size: 0.72rem;
    font-weight: 400;
    color: var(--course-text-muted);
    line-height: 1.3;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.course-toc-aside {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    margin-top: 0.1rem;
    white-space: nowrap;
}

.course-toc-filemeta {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--course-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.course-toc-action {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--course-text-muted);
    text-decoration: none;
    white-space: nowrap;
}

.course-toc-action:hover {
    color: var(--course-primary);
    text-decoration: underline;
}

.course-toc-action--primary {
    color: var(--course-primary);
}

.course-toc-children,
.course-tree-children {
    display: flex;
    flex-direction: column;
    padding-left: 0.85rem;
    margin-left: 0.55rem;
    border-left: 1px solid #e2e8f0;
    min-width: 0;
    max-width: 100%;
}

.dark .course-toc-children,
.dark .course-tree-children {
    border-left-color: #334155;
}

.course-toc-children.is-hidden,
.course-tree-children.is-hidden {
    display: none;
}

@media (max-width: 1099px) {
    .course-main-wrapper {
        padding-bottom: 5.5rem;
    }
}

@media (max-width: 768px) {
    .course-hero {
        padding: 1rem 0 1rem;
    }

    .course-hero__badges {
        gap: 0.4rem;
        margin-bottom: 0.65rem;
    }

    .course-badge-pill {
        font-size: 0.6875rem;
        padding: 0.2rem 0.5rem;
    }

    .course-hero__lead {
        font-size: 0.9rem;
        margin-bottom: 0.75rem;
    }

    .course-hero__meta-strip {
        gap: 0.5rem 0.75rem;
        font-size: 0.75rem;
    }

    .course-main-wrapper {
        padding-top: 1rem;
    }

    .course-pathway-card {
        padding: 1rem;
        margin-bottom: 1rem;
        border-radius: 0.75rem;
    }

    .course-tab-btn {
        padding: 0.5rem 0.7rem;
        font-size: 0.8125rem;
        gap: 0.35rem;
    }

    .course-tab-btn svg {
        width: 1rem !important;
        height: 1rem !important;
        max-width: 1rem !important;
        max-height: 1rem !important;
    }

    .course-section-intro h2 {
        font-size: 1.05rem;
        line-height: 1.35;
        overflow-wrap: anywhere;
    }

    .course-toc {
        padding: 0.55rem 0.6rem 0.65rem;
    }

    .course-toc-row {
        grid-template-columns: 1.05rem max-content minmax(0, 1fr);
        column-gap: 0.3rem;
        padding: 0.22rem 0;
    }

    .course-toc-aside {
        display: none;
    }

    .course-toc-toggle,
    .course-toc-toggle-spacer {
        width: 1.05rem;
        height: 1.05rem;
    }

    .course-toc-num {
        min-width: 1.3rem;
        height: 1.1rem;
        font-size: 0.625rem;
        padding: 0 0.25rem;
    }

    .course-toc-title {
        font-size: 0.8125rem;
    }

    .course-toc-item--level-0 > .course-toc-row .course-toc-title {
        font-size: 0.85rem;
    }

    .course-toc-desc {
        font-size: 0.6875rem;
    }

    .course-toc-children,
    .course-tree-children {
        padding-left: 0.45rem;
        margin-left: 0.3rem;
    }

    .course-tree-toolbar {
        flex-wrap: wrap;
        gap: 0.45rem;
        margin-bottom: 0.5rem;
    }

    .course-sidebar-card {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .course-toc {
        padding: 0.45rem 0.45rem 0.55rem;
        border-radius: 0.6rem;
    }

    .course-toc__label {
        margin-bottom: 0.4rem;
        padding: 0.2rem 0.75rem;
        font-size: 0.75rem;
    }

    .course-pathway-card__header {
        gap: 0.55rem;
    }

    .course-pathway-card__icon-badge {
        width: 36px;
        height: 36px;
        min-width: 36px;
    }
}

/* --------------------------------------------------------------------------
   Exams & Mock Tests Tab
   -------------------------------------------------------------------------- */
.course-exam-filters {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
    overflow-x: auto;
    padding-bottom: 0.25rem;
}

.course-exam-filter-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.85rem;
    font-size: 0.8125rem;
    font-weight: 600;
    border-radius: 9999px;
    border: 1px solid var(--course-card-border);
    background: var(--course-card-bg);
    color: var(--course-text-muted);
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.15s ease;
}

.course-exam-filter-btn:hover {
    color: var(--course-primary);
    border-color: var(--course-primary);
}

.course-exam-filter-btn.is-active {
    background: var(--course-primary);
    color: #ffffff;
    border-color: var(--course-primary);
}

.course-exam-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
    gap: 1rem;
    width: 100%;
    max-width: 100%;
}

.course-exam-card {
    background: var(--course-card-bg);
    border: 1px solid var(--course-card-border);
    border-radius: 0.75rem;
    padding: 1rem 1.1rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.course-exam-card:hover {
    transform: translateY(-3px);
    border-color: var(--course-primary-light);
    box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.06);
}

.course-exam-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.course-exam-badge--mock {
    background: #ffe4e6;
    color: #be123c;
    border: 1px solid #fecdd3;
    padding: 0.2rem 0.55rem;
    font-size: 0.6875rem;
    font-weight: 700;
    border-radius: 9999px;
    text-transform: uppercase;
}

.dark .course-exam-badge--mock {
    background: rgba(225, 29, 72, 0.2);
    color: #fda4af;
    border-color: rgba(253, 164, 175, 0.25);
}

.course-exam-badge--practice {
    background: #dcfce7;
    color: #15803d;
    border: 1px solid #bbf7d0;
    padding: 0.2rem 0.55rem;
    font-size: 0.6875rem;
    font-weight: 700;
    border-radius: 9999px;
    text-transform: uppercase;
}

.dark .course-exam-badge--practice {
    background: rgba(21, 128, 61, 0.2);
    color: #86efac;
    border-color: rgba(134, 239, 172, 0.25);
}

.course-exam-diff {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--course-text-muted);
    text-transform: capitalize;
}

.course-exam-card__title {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--course-text-main);
    margin: 0 0 0.5rem;
    line-height: 1.4;
}

.course-exam-card__stats {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.8125rem;
    color: var(--course-text-muted);
    margin-bottom: 1.25rem;
}

.course-exam-stat {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.course-exam-card__footer {
    padding-top: 1rem;
    border-top: 1px solid var(--course-card-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.course-exam-access {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--course-primary);
}

/* --------------------------------------------------------------------------
   Download Content Tab
   -------------------------------------------------------------------------- */
.course-download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
    gap: 1.25rem;
}

.course-download-card {
    background: var(--course-card-bg);
    border: 1px solid var(--course-card-border);
    border-radius: 0.875rem;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.course-download-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.course-download-card__head {
    display: flex;
    align-items: flex-start;
    gap: 0.875rem;
    margin-bottom: 1rem;
}

.course-download-icon {
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 0.625rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.course-download-icon svg {
    width: 1.5rem !important;
    height: 1.5rem !important;
    max-width: 1.5rem !important;
    max-height: 1.5rem !important;
}

.course-download-icon--pdf {
    background: #fee2e2;
    color: #dc2626;
}

.course-download-icon--doc {
    background: #e0e7ff;
    color: #4f46e5;
}

.course-download-icon--ppt {
    background: #ffedd5;
    color: #ea580c;
}

.course-download-icon--drive {
    background: #dcfce7;
    color: #16a34a;
}

.course-download-icon--file {
    background: #f1f5f9;
    color: #475569;
}

.course-download-card__title {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--course-text-main);
    margin: 0 0 0.25rem;
    line-height: 1.35;
}

.course-download-card__meta {
    font-size: 0.75rem;
    color: var(--course-text-muted);
}

.course-download-card__actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-top: 0.875rem;
    border-top: 1px solid var(--course-card-border);
}

/* --------------------------------------------------------------------------
   Sidebar Card (Tuition, CTA & Checklist)
   -------------------------------------------------------------------------- */
.course-sidebar-card {
    background: var(--course-card-bg);
    border: 1px solid var(--course-card-border);
    border-radius: 1rem;
    padding: 1.25rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.02);
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

.course-sidebar__price-box {
    margin-bottom: 1.25rem;
}

.course-sidebar__price-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--course-text-muted);
    margin-bottom: 0.25rem;
}

.course-sidebar__price-row {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.course-sidebar__price-current {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--course-text-main);
    letter-spacing: -0.025em;
    line-height: 1;
}

.course-sidebar__price-compare {
    font-size: 1.125rem;
    color: #94a3b8;
    text-decoration: line-through;
}

.course-sidebar__discount-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 0.375rem;
    background: #dcfce7;
    color: #15803d;
}

.dark .course-sidebar__discount-badge {
    background: rgba(21, 128, 61, 0.25);
    color: #86efac;
}

.course-sidebar__cta-group {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
    margin-bottom: 1.75rem;
}

.course-btn-primary-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.875rem 1.25rem;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 0.625rem;
    background: var(--course-primary);
    color: #ffffff;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(15, 118, 110, 0.25);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    text-align: center;
}

.course-btn-primary-cta:hover {
    background: var(--course-primary-dark);
    box-shadow: 0 6px 16px rgba(15, 118, 110, 0.35);
    transform: translateY(-1px);
    color: #ffffff;
}

.course-btn-secondary-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.65rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 0.5rem;
    background: transparent;
    color: var(--course-primary);
    border: 1px solid var(--course-primary);
    cursor: pointer;
    transition: all 0.15s ease;
    text-decoration: none;
    text-align: center;
}

.course-btn-secondary-cta:hover {
    background: var(--course-primary-50);
}

.dark .course-btn-secondary-cta:hover {
    background: rgba(15, 118, 110, 0.15);
}

/* Feature Checklist inside Sidebar (CRITICAL SVG FIX) */
.course-feature-list {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
}

.course-feature-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.875rem;
    color: var(--course-text-main);
    line-height: 1.4;
}

.course-feature-icon {
    width: 1.35rem;
    height: 1.35rem;
    border-radius: 9999px;
    background: var(--course-primary-100);
    color: var(--course-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.dark .course-feature-icon {
    background: rgba(15, 118, 110, 0.3);
    color: var(--course-primary-light);
}

.course-feature-icon svg {
    width: 0.875rem !important;
    height: 0.875rem !important;
    max-width: 0.875rem !important;
    max-height: 0.875rem !important;
}

/* Share & Guarantee */
.course-sidebar__share-box {
    padding-top: 1.25rem;
    border-top: 1px solid var(--course-card-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.course-sidebar__share-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--course-text-muted);
}

.course-sidebar__share-links {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.course-share-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border-radius: 9999px;
    border: 1px solid var(--course-card-border);
    background: var(--course-card-bg);
    color: var(--course-text-muted);
    cursor: pointer;
    transition: all 0.15s ease;
}

.course-share-btn:hover {
    color: var(--course-primary);
    border-color: var(--course-primary);
    background: var(--course-primary-50);
}

.dark .course-share-btn:hover {
    background: rgba(15, 118, 110, 0.2);
}

.course-sidebar__guarantee {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: 0.5rem;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    font-size: 0.75rem;
    color: var(--course-text-muted);
}

.dark .course-sidebar__guarantee {
    background: #0f172a;
    border-color: #334155;
}

/* --------------------------------------------------------------------------
   Overview Tab Highlights Grid
   -------------------------------------------------------------------------- */
.course-overview-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 110px), 1fr));
    gap: 0.75rem;
    margin: 0 0 1.25rem;
    width: 100%;
    max-width: 100%;
}

.course-stat-card {
    background: var(--course-card-bg);
    border: 1px solid var(--course-card-border);
    border-radius: 0.65rem;
    padding: 0.85rem 0.75rem;
    text-align: center;
    transition: transform 0.15s ease;
}

.course-stat-card:hover {
    transform: translateY(-2px);
}

.course-stat-val {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--course-primary);
    line-height: 1.2;
}

.course-stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--course-text-muted);
    margin-top: 0.25rem;
    letter-spacing: 0.03em;
}

.course-highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
    gap: 0.85rem;
    margin: 1rem 0 0;
    width: 100%;
    max-width: 100%;
}

.course-highlight-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.85rem 0.9rem;
    border-radius: 0.65rem;
    background: var(--course-card-bg);
    border: 1px solid var(--course-card-border);
}

.course-highlight-item__icon {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 0.5rem;
    background: var(--course-primary-50);
    color: var(--course-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.dark .course-highlight-item__icon {
    background: rgba(15, 118, 110, 0.2);
    color: var(--course-primary-light);
}

.course-highlight-item__text h4 {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--course-text-main);
    margin: 0 0 0.2rem;
}

.course-highlight-item__text p {
    font-size: 0.8125rem;
    color: var(--course-text-muted);
    margin: 0;
    line-height: 1.45;
}

/* --------------------------------------------------------------------------
   Mobile Sticky Bottom Bar
   -------------------------------------------------------------------------- */
.course-mobile-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background: var(--course-card-bg);
    border-top: 1px solid var(--course-card-border);
    padding: 0.75rem 1rem;
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.08);
}

@media (max-width: 768px) {
    .course-mobile-bar {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 1rem;
    }
}

.course-mobile-bar__price {
    display: flex;
    flex-direction: column;
}

.course-mobile-bar__price-sub {
    font-size: 0.6875rem;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--course-text-muted);
}

.course-mobile-bar__price-main {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--course-text-main);
    line-height: 1.2;
}

/* --------------------------------------------------------------------------
   Premium Course Card for Landing Page and Listing Page
   -------------------------------------------------------------------------- */
.et-course-card {
    display: flex;
    flex-direction: column;
    border-radius: 1.15rem;
    background: var(--course-card-bg, #ffffff);
    border: 1px solid var(--course-card-border, #e2e8f0);
    overflow: hidden;
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.25s ease;
    height: 100%;
    position: relative;
}

.et-course-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 30px -10px rgba(15, 23, 42, 0.12);
    border-color: rgba(15, 118, 110, 0.4);
}

.dark .et-course-card {
    background: #1e293b;
    border-color: #334155;
    box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.3);
}

.dark .et-course-card:hover {
    border-color: rgba(20, 184, 166, 0.45);
    box-shadow: 0 20px 35px -10px rgba(0, 0, 0, 0.5);
}

.et-course-card__media-wrap {
    display: block;
    position: relative;
    width: 100%;
    height: 145px;
    overflow: hidden;
    text-decoration: none;
}

.et-course-card--home .et-course-card__media-wrap {
    height: 135px;
}

.et-course-card__banner-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.et-course-card:hover .et-course-card__banner-img {
    transform: scale(1.05);
}

.et-course-card__gradient-art {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.et-course-card__art-pattern {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255, 255, 255, 0.15) 1.5px, transparent 1.5px);
    background-size: 16px 16px;
    opacity: 0.6;
}

.et-course-card__art-icon {
    width: 3.5rem;
    height: 3.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 9999px;
    background: rgba(255, 255, 255, 0.18);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: #ffffff;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s ease;
}

.et-course-card__art-icon svg {
    width: 2rem;
    height: 2rem;
}

.et-course-card:hover .et-course-card__art-icon {
    transform: scale(1.1) rotate(2deg);
}

.et-course-card__floating-bar {
    position: absolute;
    bottom: 0.75rem;
    left: 0.75rem;
    right: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    pointer-events: none;
    z-index: 2;
}

.et-course-card__cat-pill {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.6rem;
    border-radius: 9999px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    background: rgba(15, 23, 42, 0.75);
    color: #ffffff;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.et-course-card__discount-pill {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.6rem;
    border-radius: 9999px;
    font-size: 0.72rem;
    font-weight: 800;
    background: #ef4444;
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(239, 68, 68, 0.4);
}

.et-course-card__free-pill {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.6rem;
    border-radius: 9999px;
    font-size: 0.72rem;
    font-weight: 800;
    background: #10b981;
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(16, 185, 129, 0.35);
}

.et-course-card__body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 1.15rem;
}

.et-course-card__stats-strip {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    font-size: 0.75rem;
    color: var(--course-text-muted, #64748b);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.et-course-card__stat-item {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.et-course-card__stat-item svg {
    width: 0.875rem;
    height: 0.875rem;
}

.et-course-card__rating {
    margin-left: auto;
    font-weight: 700;
    color: #b45309;
}

.dark .et-course-card__rating {
    color: #fcd34d;
}

.et-course-card__title {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.35;
    margin: 0 0 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.et-course-card__title a {
    color: var(--course-text-main, #0f172a);
    text-decoration: none;
    transition: color 0.15s ease;
}

.et-course-card__title a:hover {
    color: var(--course-primary, #0f766e);
}

.dark .et-course-card__title a:hover {
    color: var(--course-primary-light, #14b8a6);
}

.et-course-card__excerpt {
    font-size: 0.825rem;
    color: var(--course-text-muted, #64748b);
    line-height: 1.45;
    margin: 0 0 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.et-course-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding-top: 0.85rem;
    border-top: 1px solid var(--course-card-border, #e2e8f0);
    margin-top: auto;
}

.dark .et-course-card__footer {
    border-top-color: #334155;
}

.et-course-card__pricing {
    display: flex;
    align-items: baseline;
    gap: 0.4rem;
}

.et-course-card__price-current {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--course-text-main, #0f172a);
}

.et-course-card__price-compare {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--course-text-muted, #94a3b8);
    text-decoration: line-through;
}

.et-course-card__price-free {
    font-size: 0.95rem;
    font-weight: 800;
    color: #10b981;
}

.et-course-card__cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.45rem 0.85rem;
    border-radius: 0.65rem;
    font-size: 0.8rem;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.2s ease;
}

.et-course-card:hover .et-course-card__cta-btn {
    background: #0d5f58;
    transform: translateX(2px);
}