/*
 * JMaths Learning Courses - Clean Textbook Theme
 * Mathspace-inspired minimalist aesthetic with focus on readability.
 * Clean textbook-style theme for all course views.
 */

/* =====================================================
   VARIABLES & BASE
   ===================================================== */

.courses-app-clean {
    --course-primary: #0f766e;
    --course-primary-dark: #0d6560;
    --course-secondary: #0e7490;
    --course-accent: #d97706;
    --course-success: #16a34a;
    --course-danger: #dc2626;
    --course-bg: #fafbfc;
    --course-bg-dark: #f1f3f5;
    --course-text: #1e293b;
    --course-text-muted: #64748b;
    --course-border: #e5e7eb;
    --course-card: #ffffff;
    --course-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
    --course-shadow-hover: 0 1px 3px rgba(0, 0, 0, 0.06);
    --font-display: Inter, system-ui, -apple-system, sans-serif;
    --font-body: Inter, system-ui, -apple-system, sans-serif;

    background: var(--course-bg);
    font-family: var(--font-body);
    color: var(--course-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* =====================================================
   TYPOGRAPHY
   ===================================================== */

.courses-app-clean .course-header-title,
.courses-app-clean .module-title,
.courses-app-clean .course-hero-title,
.courses-app-clean .stat-value {
    font-family: var(--font-display);
    letter-spacing: -0.01em;
}

.courses-app-clean .courses-container {
    min-height: calc(100vh - 200px);
}

/* =====================================================
   COURSE LIST PAGE
   ===================================================== */

.courses-app-clean .course-hero-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 0.25rem;
}

.courses-app-clean .course-hero-subtitle {
    font-size: 1rem;
    color: var(--course-text-muted);
    line-height: 1.6;
}

.courses-app-clean .course-card {
    background: var(--course-card);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--course-shadow);
    height: 100%;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--course-border);
}

.courses-app-clean .course-card:hover {
    box-shadow: var(--course-shadow-hover);
    border-color: #d1d5db;
}

.courses-app-clean .course-card-header {
    background: var(--course-bg-dark);
    padding: 1.25rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    border-bottom: 1px solid var(--course-border);
}

.courses-app-clean .course-icon {
    font-size: 2rem;
}

.courses-app-clean .course-programme-badge {
    background: var(--course-card);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--course-text-muted);
    border: 1px solid var(--course-border);
}

.courses-app-clean .course-stage-badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    vertical-align: middle;
}
.courses-app-clean .course-stage-badge.stage-beta {
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fcd34d;
}
.courses-app-clean .course-stage-badge.stage-preview {
    background: #dbeafe;
    color: #1e40af;
    border: 1px solid #93c5fd;
}

.courses-app-clean .course-card-body {
    padding: 1.5rem;
    flex-grow: 1;
}

.courses-app-clean .course-card-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.courses-app-clean .course-card-description {
    color: var(--course-text-muted);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.courses-app-clean .course-card-meta {
    display: flex;
    gap: 1rem;
    color: var(--course-text-muted);
    font-size: 0.8rem;
}

.courses-app-clean .course-card-meta i {
    margin-right: 0.25rem;
    color: var(--course-primary);
}

.courses-app-clean .course-card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--course-border);
}

.courses-app-clean .course-progress-bar .progress {
    border-radius: 4px;
    background: var(--course-bg-dark);
}

/* =====================================================
   BUTTONS
   ===================================================== */

.courses-app-clean .btn-course-start,
.courses-app-clean .btn-course-continue {
    display: block;
    width: 100%;
    padding: 0.625rem;
    border-radius: 6px;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border: none;
    font-size: 0.875rem;
}

.courses-app-clean .btn-course-start {
    background: var(--course-primary);
    color: white;
}

.courses-app-clean .btn-course-start:hover {
    background: var(--course-primary-dark);
    color: white;
}

.courses-app-clean .btn-course-continue {
    background: var(--course-success);
    color: white;
}

.courses-app-clean .btn-course-continue:hover {
    background: #15803d;
    color: white;
}

.courses-app-clean .btn-admin-manage {
    background: var(--course-card);
    color: var(--course-text-muted);
    border: 1px solid var(--course-border);
    border-radius: 6px;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    font-weight: 500;
    text-decoration: none;
}

.courses-app-clean .btn-admin-manage:hover {
    color: var(--course-text);
    border-color: #d1d5db;
}

/* =====================================================
   COURSE DASHBOARD
   ===================================================== */

.courses-app-clean .course-dashboard {
    background: var(--course-bg);
    min-height: 100vh;
}

.courses-app-clean .course-header {
    background: transparent;
    padding: 1rem 0 0.5rem;
}

.courses-app-clean .course-header > .container {
    background: var(--course-card);
    border: 1px solid var(--course-border);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    box-shadow: var(--course-shadow);
}

.courses-app-clean .course-header-icon {
    font-size: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--course-bg-dark);
    border-radius: 8px;
    margin-right: 1rem;
}

.courses-app-clean .course-header-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 0.125rem;
}

.courses-app-clean .course-header-programme {
    font-size: 0.8rem;
    color: var(--course-text-muted);
    margin-bottom: 0;
}

.courses-app-clean .course-nav-link {
    color: var(--course-text-muted);
    font-weight: 500;
    font-size: 0.875rem;
    text-decoration: none;
    padding: 0.375rem 0.75rem;
    border-radius: 4px;
}

.courses-app-clean .course-nav-link:hover,
.courses-app-clean .course-nav-link.active {
    color: var(--course-primary);
    background: rgba(15, 118, 110, 0.06);
}

/* Progress Ring */
.courses-app-clean .progress-ring-container {
    position: relative;
    width: 64px;
    height: 64px;
}

.courses-app-clean .progress-ring {
    transform: rotate(-90deg);
}

.courses-app-clean .progress-ring-bg {
    fill: none;
    stroke: var(--course-border);
    stroke-width: 5;
}

.courses-app-clean .progress-ring-progress {
    fill: none;
    stroke: var(--course-primary);
    stroke-width: 5;
    stroke-linecap: round;
}

.courses-app-clean .progress-ring-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--course-text);
}

.courses-app-clean .btn-enroll {
    background: var(--course-primary);
    color: white;
    border: none;
    padding: 0.625rem 1.25rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.875rem;
}

.courses-app-clean .btn-enroll:hover {
    background: var(--course-primary-dark);
}

/* Stats & Badges Bar */
.courses-app-clean .stats-badges-bar {
    padding: 0.5rem 0;
}

.courses-app-clean .stats-badges-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.courses-app-clean .badges-section {
    display: none;
}

.courses-app-clean .stats-circles {
    display: flex;
    gap: 1.5rem;
    padding: 0.75rem 0;
}

.courses-app-clean .stat-circle {
    text-align: center;
}

.courses-app-clean .stat-val {
    display: block;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--course-text);
    line-height: 1.2;
}

.courses-app-clean .stat-lbl {
    display: block;
    font-size: 0.7rem;
    color: var(--course-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.courses-app-clean .enrollment-stats {
    margin-top: 0 !important;
    margin-bottom: 1rem !important;
}

.courses-app-clean .enrollment-stats .stat-card {
    width: auto;
    height: auto;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--course-card);
    box-shadow: var(--course-shadow);
    border: 1px solid var(--course-border);
    padding: 0.75rem 1rem;
    animation: none;
    opacity: 1;
}

.courses-app-clean .enrollment-stats .stat-card:hover {
    transform: none;
}

.courses-app-clean .stat-value {
    display: block;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--course-text);
    line-height: 1.2;
}

.courses-app-clean .stat-label {
    display: block;
    font-size: 0.7rem;
    color: var(--course-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

/* Hide gamified elements */
.courses-app-clean .achievements-card,
.courses-app-clean .achievements-section,
.courses-app-clean .mini-badge,
.courses-app-clean .badges-more {
    display: none;
}

/* =====================================================
   TIMELINE / MODULE LIST
   ===================================================== */

.courses-app-clean .course-timeline {
    position: relative;
    padding: 0.5rem 0;
    max-width: 900px;
    margin: 0 auto;
}

.courses-app-clean .timeline-module {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    position: relative;
    opacity: 1;
    animation: none;
}

.courses-app-clean .timeline-connector {
    display: none;
}

.courses-app-clean .module-avatar {
    display: none;
}

.courses-app-clean .module-content {
    flex-grow: 1;
    background: var(--course-card);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--course-shadow);
    border: 1px solid var(--course-border);
}

.courses-app-clean .module-content:hover {
    border-color: #d1d5db;
}

.courses-app-clean .module-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.courses-app-clean .module-header-collapsible {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    cursor: pointer;
}

.courses-app-clean .module-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--course-text);
    margin: 0;
    line-height: 1.4;
}

.courses-app-clean .module-title a {
    color: inherit;
    text-decoration: none;
}

.courses-app-clean .module-title a:hover {
    color: var(--course-primary);
}

.courses-app-clean .module-description {
    color: var(--course-text-muted);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.courses-app-clean .module-meta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.courses-app-clean .meta-item {
    font-size: 0.8rem;
    color: var(--course-text-muted);
}

.courses-app-clean .meta-item i {
    margin-right: 0.25rem;
    color: var(--course-primary);
}

.courses-app-clean .module-status-badge {
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.courses-app-clean .module-status-badge.locked {
    background: var(--course-bg-dark);
    color: var(--course-text-muted);
}

.courses-app-clean .module-status-badge.available {
    background: #e0f2fe;
    color: #0369a1;
}

.courses-app-clean .module-status-badge.in_progress {
    background: #fef3c7;
    color: #b45309;
}

.courses-app-clean .module-status-badge.completed {
    background: #dcfce7;
    color: #15803d;
}

.courses-app-clean .collapse-icon {
    color: var(--course-text-muted);
    font-size: 0.75rem;
    margin-left: 0.5rem;
}

.courses-app-clean .module-progress-indicator {
    width: 100%;
    height: 3px;
    background: var(--course-border);
    border-radius: 2px;
    margin-top: 0.75rem;
    overflow: hidden;
}

.courses-app-clean .module-progress-indicator .progress-bar {
    height: 100%;
    background: var(--course-primary);
    border-radius: 2px;
}

.courses-app-clean .timeline-module.locked .module-content {
    opacity: 0.6;
}

/* =====================================================
   LESSON LIST (inside dashboard modules)
   ===================================================== */

.courses-app-clean .lesson-list {
    margin-top: 1rem;
    border-top: 1px solid var(--course-border);
    padding-top: 0.75rem;
}

.courses-app-clean .lesson-wrapper {
    border-bottom: 1px solid var(--course-border);
}

.courses-app-clean .lesson-wrapper:last-child {
    border-bottom: none;
}

.courses-app-clean .lesson-item-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0;
    cursor: pointer;
}

.courses-app-clean .lesson-item-header:hover .lesson-item-title {
    color: var(--course-primary);
}

.courses-app-clean .lesson-status-icon {
    flex-shrink: 0;
    font-size: 0.875rem;
}

.courses-app-clean .lesson-item-title {
    flex: 1;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--course-text);
}

.courses-app-clean .lesson-item-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.75rem;
    color: var(--course-text-muted);
}

.courses-app-clean .lesson-time i {
    margin-right: 0.2rem;
}

.courses-app-clean .lesson-expand-icon {
    font-size: 0.65rem;
    color: var(--course-text-muted);
}

.courses-app-clean .lesson-pages-bar {
    display: flex;
    gap: 0.375rem;
    padding: 0.5rem 0 0.75rem 1.75rem;
    flex-wrap: wrap;
}

.courses-app-clean .page-icon-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    background: var(--course-bg-dark);
    color: var(--course-text-muted);
    text-decoration: none;
    font-size: 0.7rem;
    font-weight: 500;
    border: 1px solid var(--course-border);
}

.courses-app-clean .page-icon-btn:hover {
    background: var(--course-primary);
    color: white;
    border-color: var(--course-primary);
}

.courses-app-clean .page-icon-btn i {
    font-size: 0.75rem;
}

.courses-app-clean .page-icon-label {
    max-width: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Lesson pills (alternative layout) */
.courses-app-clean .lesson-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.courses-app-clean .lesson-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.35rem 0.65rem;
    background: var(--course-bg-dark);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--course-text);
    text-decoration: none;
    border: 1px solid var(--course-border);
}

.courses-app-clean .lesson-pill:hover {
    background: var(--course-primary);
    color: white;
    border-color: var(--course-primary);
}

.courses-app-clean .lesson-pill.completed {
    background: #dcfce7;
    color: #15803d;
    border-color: #bbf7d0;
}

.courses-app-clean .lesson-pill.completed:hover {
    background: var(--course-success);
    color: white;
    border-color: var(--course-success);
}

.courses-app-clean .lesson-icon {
    font-size: 0.8rem;
}

.courses-app-clean .module-admin-actions {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--course-border);
}

.courses-app-clean .locked-lessons {
    margin-top: 0.75rem;
    padding: 0.75rem;
    background: var(--course-bg-dark);
    border-radius: 6px;
}

/* =====================================================
   MODULE DETAIL PAGE
   ===================================================== */

.courses-app-clean .module-detail,
.courses-app-clean .lesson-detail {
    background: var(--course-bg);
}

.courses-app-clean .course-breadcrumb {
    background: var(--course-card);
    padding: 0.625rem 0;
    border-bottom: 1px solid var(--course-border);
    box-shadow: none;
}

.courses-app-clean .course-breadcrumb .breadcrumb {
    font-size: 0.8rem;
    margin-bottom: 0;
}

.courses-app-clean .course-breadcrumb .breadcrumb a {
    color: var(--course-primary);
    text-decoration: none;
}

.courses-app-clean .course-breadcrumb .breadcrumb a:hover {
    color: var(--course-primary-dark);
}

.courses-app-clean .module-header,
.courses-app-clean .lesson-header {
    background: var(--course-card);
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--course-border);
}

.courses-app-clean .module-header-icon {
    font-size: 2.25rem;
}

.courses-app-clean .module-header-title,
.courses-app-clean .lesson-header-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 0;
    line-height: 1.3;
}

.courses-app-clean .module-header-description {
    color: var(--course-text-muted);
    font-size: 0.9rem;
    margin-top: 0.25rem;
    margin-bottom: 0;
    line-height: 1.6;
}

/* Module detail lesson list */
.courses-app-clean .lessons-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.courses-app-clean .lesson-card {
    background: var(--course-card);
    border-radius: 8px;
    padding: 1.25rem;
    border: 1px solid var(--course-border);
    box-shadow: var(--course-shadow);
    display: block;
    text-decoration: none;
}

.courses-app-clean .lesson-card:hover {
    border-color: #d1d5db;
    box-shadow: var(--course-shadow-hover);
}

.courses-app-clean .lesson-card.completed {
    border-left: 3px solid var(--course-success);
}

.courses-app-clean .lesson-header {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    background: none;
    padding: 0;
    border: none;
}

.courses-app-clean .lesson-status .status-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
}

.courses-app-clean .status-icon.not-started { color: var(--course-border); }
.courses-app-clean .status-icon.in-progress { color: var(--course-primary); }
.courses-app-clean .status-icon.completed { color: var(--course-success); }

.courses-app-clean .lesson-info {
    flex-grow: 1;
}

.courses-app-clean .lesson-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--course-text);
    margin-bottom: 0.2rem;
    line-height: 1.4;
}

.courses-app-clean .lesson-meta {
    display: flex;
    gap: 0.75rem;
    font-size: 0.75rem;
    color: var(--course-text-muted);
}

.courses-app-clean .lesson-duration i {
    margin-right: 0.2rem;
}

.courses-app-clean .lesson-arrow {
    color: var(--course-text-muted);
}

/* Page type icons */
.courses-app-clean .lesson-pages {
    display: flex;
    gap: 0.375rem;
    overflow-x: auto;
    padding: 0.25rem 0;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.courses-app-clean .lesson-pages::-webkit-scrollbar {
    display: none;
}

.courses-app-clean .page-type-icon {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.35rem 0.65rem;
    border-radius: 4px;
    background: var(--course-bg-dark);
    color: var(--course-text-muted);
    text-decoration: none;
    font-size: 0.7rem;
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
    border: 1px solid var(--course-border);
}

.courses-app-clean .page-type-icon:hover {
    background: var(--course-primary);
    color: white;
    border-color: var(--course-primary);
}

.courses-app-clean .page-type-icon i {
    font-size: 0.75rem;
}

.courses-app-clean .page-label {
    max-width: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Sidebar */
.courses-app-clean .lesson-sidebar,
.courses-app-clean .module-sidebar {
    position: sticky;
    top: 1rem;
}

.courses-app-clean .sidebar-card {
    background: var(--course-card);
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 0.75rem;
    box-shadow: var(--course-shadow);
    border: 1px solid var(--course-border);
}

.courses-app-clean .sidebar-card h5 {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.courses-app-clean .sidebar-card .progress {
    border-radius: 4px;
    height: 6px;
    background: var(--course-bg-dark);
}

.courses-app-clean .sidebar-card .progress-bar {
    background: var(--course-primary);
    border-radius: 4px;
}

/* Syllabus codes */
.courses-app-clean .syllabus-codes {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.courses-app-clean .syllabus-badge {
    display: inline-block;
    padding: 0.15rem 0.4rem;
    background: var(--course-bg-dark);
    border-radius: 3px;
    font-size: 0.75rem;
    font-family: ui-monospace, SFMono-Regular, monospace;
    color: var(--course-text);
    border: 1px solid var(--course-border);
}

/* Objectives */
.courses-app-clean .objectives-checklist {
    max-height: 400px;
    overflow-y: auto;
}

.courses-app-clean .objective-item {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--course-border);
}

.courses-app-clean .objective-item:last-child {
    border-bottom: none;
}

.courses-app-clean .objective-status {
    flex-shrink: 0;
    font-size: 0.875rem;
}

.courses-app-clean .objective-content {
    flex: 1;
    min-width: 0;
}

.courses-app-clean .objective-code {
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 0.65rem;
    background: var(--course-bg-dark);
    padding: 0.1rem 0.3rem;
    border-radius: 2px;
    margin-bottom: 0.15rem;
    display: inline-block;
}

.courses-app-clean .objective-text {
    font-size: 0.775rem;
    color: var(--course-text-muted);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.courses-app-clean .confidence-stars {
    font-size: 0.7rem;
    color: var(--course-primary);
    letter-spacing: 1px;
}

.courses-app-clean .rate-objective {
    padding: 0.25rem;
    opacity: 0;
}

.courses-app-clean .objective-item:hover .rate-objective {
    opacity: 1;
}

.courses-app-clean .objectives-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.courses-app-clean .objectives-list li {
    position: relative;
    padding-left: 1rem;
    margin-bottom: 0.375rem;
    font-size: 0.825rem;
    color: var(--course-text-muted);
    line-height: 1.5;
}

.courses-app-clean .objectives-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 5px;
    height: 5px;
    background: var(--course-primary);
    border-radius: 50%;
}

/* =====================================================
   LESSON SPLIT LAYOUT
   ===================================================== */

.courses-app-clean .lesson-split {
    height: 100vh;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    background: var(--course-bg);
    overflow: hidden;
}

.courses-app-clean .lesson-split-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 1rem;
    background: var(--course-card);
    border-bottom: 1px solid var(--course-border);
    flex-shrink: 0;
}

.courses-app-clean .lesson-split-header .back-link {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    background: var(--course-bg-dark);
    color: var(--course-text);
    text-decoration: none;
    border: 1px solid var(--course-border);
}

.courses-app-clean .lesson-split-header .back-link:hover {
    color: var(--course-primary);
    border-color: var(--course-primary);
}

.courses-app-clean .lesson-split-header .header-center {
    flex: 1;
    min-width: 0;
}

.courses-app-clean .lesson-split-header .lesson-badge {
    font-size: 0.65rem;
    padding: 0.15rem 0.4rem;
    background: rgba(15, 118, 110, 0.08);
    color: var(--course-primary);
    border-radius: 3px;
    font-weight: 600;
    text-transform: uppercase;
}

.courses-app-clean .lesson-split-header h1 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--course-text);
    margin: 0.15rem 0 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.courses-app-clean .lesson-split-header .header-progress {
    display: flex;
    gap: 0.3rem;
}

.courses-app-clean .progress-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    border: 2px solid var(--course-border);
    background: var(--course-card);
    cursor: pointer;
    padding: 0;
}

.courses-app-clean .progress-dot:hover {
    border-color: var(--course-primary);
}

.courses-app-clean .progress-dot.active {
    background: var(--course-primary);
    border-color: var(--course-primary);
}

.courses-app-clean .progress-dot.viewed {
    background: var(--course-success);
    border-color: var(--course-success);
}

.courses-app-clean .split-content {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* Reference Panel */
.courses-app-clean .reference-panel {
    width: 300px;
    background: var(--course-card);
    border-right: 1px solid var(--course-border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.courses-app-clean .reference-panel.collapsed {
    width: 44px;
}

.courses-app-clean .reference-panel.collapsed .panel-body,
.courses-app-clean .reference-panel.collapsed .panel-header span {
    display: none;
}

.courses-app-clean .reference-panel .panel-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 0.75rem;
    border-bottom: 1px solid var(--course-border);
    font-weight: 600;
    color: var(--course-text-muted);
    font-size: 0.8rem;
}

.courses-app-clean .reference-panel .panel-header i {
    color: var(--course-primary);
}

.courses-app-clean .reference-panel .toggle-ref {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--course-text-muted);
    cursor: pointer;
    padding: 0.2rem;
}

.courses-app-clean .reference-panel .panel-body {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem;
}

.courses-app-clean .ref-section {
    margin-bottom: 0.75rem;
    padding: 0.625rem;
    background: var(--course-bg);
    border-radius: 6px;
    border-left: 3px solid var(--course-primary);
}

.courses-app-clean .ref-section.example {
    border-left-color: var(--course-accent);
    background: #fffdf5;
}

.courses-app-clean .ref-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--course-text-muted);
    margin-bottom: 0.375rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.courses-app-clean .ref-content {
    font-size: 0.825rem;
    line-height: 1.6;
    color: var(--course-text);
}

/* Main Panel */
.courses-app-clean .main-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
}

.courses-app-clean .content-blocks {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
}

.courses-app-clean .content-block {
    display: none;
}

.courses-app-clean .content-block.active {
    display: block;
}

.courses-app-clean .content-block h2 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.courses-app-clean .content-block h2 i {
    color: var(--course-primary);
}

.courses-app-clean .block-theory,
.courses-app-clean .block-example {
    background: var(--course-card);
    padding: 1.25rem;
    border-radius: 6px;
    border: 1px solid var(--course-border);
}

.courses-app-clean .block-example {
    border-left: 3px solid var(--course-accent);
}

.courses-app-clean .block-practice,
.courses-app-clean .block-quiz {
    text-align: center;
    padding: 2.5rem 2rem;
    background: var(--course-card);
    border-radius: 6px;
    border: 1px solid var(--course-border);
}

.courses-app-clean .block-practice p,
.courses-app-clean .block-quiz p {
    color: var(--course-text-muted);
    margin-bottom: 1.25rem;
}

.courses-app-clean .block-tip {
    display: flex;
    gap: 0.75rem;
    padding: 0.875rem;
    background: #fefdf5;
    border-radius: 6px;
    border-left: 3px solid var(--course-accent);
}

.courses-app-clean .block-tip .tip-icon {
    color: var(--course-accent);
    font-size: 1.1rem;
}

/* Block Nav */
.courses-app-clean .block-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.625rem 1.25rem;
    background: var(--course-card);
    border-top: 1px solid var(--course-border);
    flex-shrink: 0;
}

.courses-app-clean .nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.4rem 0.875rem;
    background: var(--course-bg-dark);
    color: var(--course-text);
    border: 1px solid var(--course-border);
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
}

.courses-app-clean .nav-btn:hover:not(:disabled) {
    background: var(--course-primary);
    color: white;
    border-color: var(--course-primary);
}

.courses-app-clean .nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.courses-app-clean .nav-btn.next.finish {
    background: var(--course-success);
    color: white;
    border-color: var(--course-success);
}

.courses-app-clean .nav-btn.mark {
    background: transparent;
    border-color: var(--course-primary);
    color: var(--course-primary);
}

.courses-app-clean .nav-btn.mark.done {
    background: var(--course-success);
    border-color: var(--course-success);
    color: white;
}

@media (max-width: 768px) {
    .courses-app-clean .reference-panel {
        display: none;
    }
}

/* =====================================================
   OLD LESSON SLIDES STYLES
   ===================================================== */

.courses-app-clean .lesson-detail.lesson-slides {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--course-bg);
}

.courses-app-clean .lesson-slides .lesson-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--course-card);
    border-bottom: 1px solid var(--course-border);
    padding: 0.75rem 0;
    box-shadow: none;
}

.courses-app-clean .lesson-slides .lesson-header .container {
    max-width: 900px;
}

.courses-app-clean .lesson-slides .lesson-header-title {
    color: var(--course-text);
    font-size: 1.125rem;
    font-weight: 700;
}

.courses-app-clean .lesson-slides .lesson-type-badge {
    background: rgba(15, 118, 110, 0.08);
    color: var(--course-primary);
}

.courses-app-clean .lesson-slides .btn-back {
    background: var(--course-bg-dark);
    color: var(--course-text);
    border: 1px solid var(--course-border);
    width: 32px;
    height: 32px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.courses-app-clean .lesson-slides .btn-back:hover {
    color: var(--course-primary);
    border-color: var(--course-primary);
}

.courses-app-clean .lesson-slides .slide-counter {
    background: var(--course-bg-dark);
    color: var(--course-text);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.8rem;
    border: 1px solid var(--course-border);
}

.courses-app-clean .lesson-slides .slide-nav-pills {
    margin-top: 0.625rem;
    gap: 0.3rem;
}

.courses-app-clean .lesson-slides .slide-pill {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid var(--course-border);
    background: var(--course-card);
    color: var(--course-text-muted);
    font-weight: 600;
    font-size: 0.75rem;
}

.courses-app-clean .lesson-slides .slide-pill:hover {
    border-color: var(--course-primary);
    color: var(--course-primary);
}

.courses-app-clean .lesson-slides .slide-pill.active {
    background: var(--course-primary);
    color: white;
    border-color: var(--course-primary);
}

.courses-app-clean .lesson-slides .slide-pill.viewed {
    border-color: var(--course-success);
    color: var(--course-success);
}

.courses-app-clean .lesson-slides .slide-pill.viewed.active {
    background: var(--course-success);
    color: white;
}

.courses-app-clean .lesson-slides .slide-progress {
    height: 2px;
    background: var(--course-border);
    border-radius: 1px;
    margin-top: 0.625rem;
}

.courses-app-clean .lesson-slides .slide-progress-bar {
    height: 100%;
    background: var(--course-primary);
    border-radius: 1px;
}

.courses-app-clean .lesson-slides .container.py-4 {
    flex: 1;
    max-width: 900px;
    padding: 1.25rem 1rem !important;
}

.courses-app-clean .lesson-slides .slide {
    display: none;
}

.courses-app-clean .lesson-slides .slide.active {
    display: block;
}

.courses-app-clean .lesson-slides .slide-content-wrapper {
    background: var(--course-card);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--course-shadow);
    border: 1px solid var(--course-border);
}

.courses-app-clean .lesson-slides .slide-block-header {
    margin-bottom: 1rem;
    padding-bottom: 0.625rem;
    border-bottom: 1px solid var(--course-border);
}

.courses-app-clean .lesson-slides .block-type-icon {
    width: 36px;
    height: 36px;
    border-radius: 6px;
    background: var(--course-bg-dark);
    color: var(--course-primary);
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.courses-app-clean .lesson-slides .slide-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--course-text);
}

.courses-app-clean .lesson-slides .slide-navigation {
    position: sticky;
    bottom: 0;
    background: var(--course-card);
    border-top: 1px solid var(--course-border);
    padding: 0.625rem 0;
    margin-top: 0.75rem;
    z-index: 50;
}

.courses-app-clean .lesson-slides .btn-slide-nav {
    background: var(--course-bg-dark);
    color: var(--course-text);
    border: 1px solid var(--course-border);
    padding: 0.4rem 0.875rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.85rem;
}

.courses-app-clean .lesson-slides .btn-slide-nav:hover:not(:disabled) {
    background: var(--course-primary);
    color: white;
    border-color: var(--course-primary);
}

.courses-app-clean .lesson-slides .btn-slide-nav:disabled {
    opacity: 0.4;
}

.courses-app-clean .lesson-slides .btn-slide-nav.btn-finish {
    background: var(--course-primary);
    color: white;
    border-color: var(--course-primary);
}

.courses-app-clean .lesson-slides .btn-complete-slide {
    background: transparent;
    color: var(--course-primary);
    border: 1px solid var(--course-primary);
    padding: 0.3rem 0.65rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.courses-app-clean .lesson-slides .btn-complete-slide.viewed {
    background: var(--course-success);
    color: white;
    border-color: var(--course-success);
}

.courses-app-clean .lesson-slides .lesson-complete-card {
    margin-top: 1.25rem;
    text-align: center;
    padding: 1.5rem;
    background: var(--course-card);
    border-radius: 8px;
    border: 1px solid var(--course-border);
}

.courses-app-clean .lesson-slides .lesson-complete-card .complete-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

/* =====================================================
   STANDALONE SLIDE STYLES
   ===================================================== */

.courses-app-clean .slides-container {
    position: relative;
    min-height: 400px;
}

.courses-app-clean .slide {
    display: none;
}

.courses-app-clean .slide.active {
    display: block;
}

.courses-app-clean .slide-content-wrapper {
    background: var(--course-card);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--course-shadow);
    border: 1px solid var(--course-border);
    min-height: 300px;
}

.courses-app-clean .slide-block-header {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--course-border);
}

.courses-app-clean .block-type-icon {
    width: 36px;
    height: 36px;
    border-radius: 6px;
    background: var(--course-bg-dark);
    color: var(--course-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.courses-app-clean .slide-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--course-text);
    margin: 0;
}

.courses-app-clean .slide-nav-pills {
    display: flex;
    gap: 0.3rem;
    margin-top: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.courses-app-clean .slide-pill {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid var(--course-border);
    background: var(--course-card);
    color: var(--course-text-muted);
    font-weight: 600;
    font-size: 0.75rem;
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.courses-app-clean .slide-pill:hover {
    border-color: var(--course-primary);
    color: var(--course-primary);
}

.courses-app-clean .slide-pill.active {
    background: var(--course-primary);
    color: white;
    border-color: var(--course-primary);
}

.courses-app-clean .slide-pill.viewed {
    border-color: var(--course-success);
}

.courses-app-clean .slide-pill.viewed .pill-number {
    display: none;
}

.courses-app-clean .slide-pill.viewed .pill-check {
    display: flex;
}

.courses-app-clean .slide-pill.viewed.active {
    background: var(--course-success);
    color: white;
}

.courses-app-clean .slide-pill .pill-check {
    display: none;
    font-size: 0.7rem;
}

.courses-app-clean .slide-progress {
    height: 2px;
    background: var(--course-border);
    border-radius: 1px;
    margin-top: 0.75rem;
    overflow: hidden;
}

.courses-app-clean .slide-progress-bar {
    height: 100%;
    background: var(--course-primary);
    border-radius: 1px;
}

.courses-app-clean .slide-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding: 0.75rem 0;
}

.courses-app-clean .btn-slide-nav {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    border: 1px solid var(--course-border);
    background: var(--course-card);
    color: var(--course-text);
    font-size: 0.875rem;
}

.courses-app-clean .btn-slide-nav:hover:not(:disabled) {
    border-color: var(--course-primary);
    color: var(--course-primary);
}

.courses-app-clean .btn-slide-nav:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.courses-app-clean .btn-slide-nav.btn-next {
    background: var(--course-primary);
    border-color: var(--course-primary);
    color: white;
}

.courses-app-clean .btn-slide-nav.btn-next:hover:not(:disabled) {
    background: var(--course-primary-dark);
    border-color: var(--course-primary-dark);
    color: white;
}

.courses-app-clean .btn-slide-nav.btn-finish {
    background: var(--course-success);
    border-color: var(--course-success);
    color: white;
}

.courses-app-clean .btn-slide-nav.btn-finish:hover:not(:disabled) {
    background: #15803d;
    border-color: #15803d;
}

.courses-app-clean .slide-nav-center {
    flex-grow: 1;
    display: flex;
    justify-content: center;
}

.courses-app-clean .btn-complete-slide {
    padding: 0.375rem 0.875rem;
    border-radius: 4px;
    font-weight: 500;
    border: 1px solid var(--course-border);
    background: var(--course-card);
    color: var(--course-text-muted);
    font-size: 0.825rem;
}

.courses-app-clean .btn-complete-slide:hover:not(:disabled) {
    border-color: var(--course-success);
    color: var(--course-success);
}

.courses-app-clean .btn-complete-slide.viewed {
    background: var(--course-success);
    border-color: var(--course-success);
    color: white;
}

/* Lesson Complete Card */
.courses-app-clean .lesson-complete-card {
    background: var(--course-card);
    border: 1px solid var(--course-border);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    margin-top: 1.5rem;
}

.courses-app-clean .lesson-complete-card.hidden {
    display: none;
}

.courses-app-clean .lesson-complete-card .complete-icon {
    font-size: 3rem;
    margin-bottom: 0.75rem;
}

.courses-app-clean .lesson-complete-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 1rem;
}

.courses-app-clean .complete-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

/* Lesson Type Badge */
.courses-app-clean .lesson-type-badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    font-size: 0.7rem;
    font-weight: 600;
    margin-bottom: 0.375rem;
}

.courses-app-clean .lesson-type-badge.learn { background: #e0f2fe; color: #0369a1; }
.courses-app-clean .lesson-type-badge.practice { background: #fef3c7; color: #b45309; }
.courses-app-clean .lesson-type-badge.quiz { background: #fee2e2; color: #dc2626; }
.courses-app-clean .lesson-type-badge.review { background: #dcfce7; color: #15803d; }
.courses-app-clean .lesson-type-badge.challenge { background: #f3e8ff; color: #7c3aed; }

.courses-app-clean .lesson-duration {
    color: var(--course-text-muted);
    font-size: 0.85rem;
}

/* Video / Embed */
.courses-app-clean .video-wrapper,
.courses-app-clean .embed-wrapper,
.courses-app-clean .video-container,
.courses-app-clean .embed-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 6px;
}

.courses-app-clean .video-wrapper iframe,
.courses-app-clean .embed-wrapper iframe,
.courses-app-clean .video-container iframe,
.courses-app-clean .embed-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Lesson Content */
.courses-app-clean .lesson-content {
    background: var(--course-card);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--course-shadow);
    border: 1px solid var(--course-border);
    max-width: 900px;
    margin: 0 auto;
    line-height: 1.7;
}

.courses-app-clean .content-block {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--course-border);
}

.courses-app-clean .content-block:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.courses-app-clean .block-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 0.75rem;
}

.courses-app-clean .example-content {
    background: var(--course-bg);
    border-radius: 6px;
    padding: 1.25rem;
    border: 1px solid var(--course-border);
}

.courses-app-clean .example-badge,
.courses-app-clean .practice-badge,
.courses-app-clean .quiz-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.courses-app-clean .example-badge { background: #fef3c7; color: #b45309; }
.courses-app-clean .practice-badge { background: #e0f2fe; color: #0369a1; }
.courses-app-clean .quiz-badge { background: #fee2e2; color: #dc2626; }

.courses-app-clean .tip-block {
    display: flex;
    gap: 0.75rem;
    background: #fafbfc;
    border-radius: 6px;
    padding: 0.875rem 1rem;
    border-left: 3px solid var(--course-primary);
}

.courses-app-clean .tip-icon {
    color: var(--course-primary);
    font-size: 1.1rem;
    flex-shrink: 0;
}

.courses-app-clean .btn-practice,
.courses-app-clean .btn-quiz {
    padding: 0.625rem 1.25rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.875rem;
}

.courses-app-clean .btn-practice {
    background: var(--course-primary);
    color: white;
    border: none;
}

.courses-app-clean .btn-practice:hover {
    background: var(--course-primary-dark);
    color: white;
}

.courses-app-clean .btn-quiz {
    background: var(--course-danger);
    color: white;
    border: none;
}

.courses-app-clean .btn-quiz:hover {
    background: #b91c1c;
    color: white;
}

.courses-app-clean .btn-practice-start,
.courses-app-clean .btn-quiz-start {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.625rem 1.25rem;
    background: var(--course-primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    font-size: 0.875rem;
}

.courses-app-clean .btn-practice-start:hover,
.courses-app-clean .btn-quiz-start:hover {
    background: var(--course-primary-dark);
    color: white;
}

/* Lesson Navigation */
.courses-app-clean .lesson-navigation {
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--course-border);
}

.courses-app-clean .lesson-navigation .nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--course-text-muted);
    text-decoration: none;
    font-size: 0.85rem;
}

.courses-app-clean .lesson-navigation .nav-link:hover {
    color: var(--course-primary);
}

.courses-app-clean .btn-complete-lesson {
    display: block;
    width: 100%;
    padding: 0.625rem;
    background: var(--course-success);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.875rem;
}

.courses-app-clean .btn-complete-lesson:hover {
    background: #15803d;
}

.courses-app-clean .completed-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.625rem;
    background: #dcfce7;
    color: var(--course-success);
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.85rem;
}

/* Completion Modal */
.courses-app-clean .rating-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.courses-app-clean .rating-btn {
    padding: 0.4rem 0.875rem;
    background: var(--course-bg-dark);
    border: 1px solid var(--course-border);
    border-radius: 4px;
    font-size: 0.825rem;
    color: var(--course-text);
    cursor: pointer;
}

.courses-app-clean .rating-btn:hover {
    border-color: var(--course-primary);
    color: var(--course-primary);
}

.courses-app-clean .rating-btn.active {
    border-color: var(--course-primary);
    background: var(--course-primary);
    color: white;
}

/* =====================================================
   PRACTICE MODE
   ===================================================== */

.courses-app-clean .practice-mode {
    background: var(--course-bg);
    min-height: 100vh;
}

.courses-app-clean .practice-header {
    background: var(--course-card);
    padding: 1.25rem 0 0.75rem;
    border-bottom: 1px solid var(--course-border);
    box-shadow: none;
}

.courses-app-clean .btn-back {
    width: 36px;
    height: 36px;
    border-radius: 6px;
    background: var(--course-bg-dark);
    border: 1px solid var(--course-border);
    color: var(--course-text);
    display: flex;
    align-items: center;
    justify-content: center;
}

.courses-app-clean .btn-back:hover {
    color: var(--course-primary);
    border-color: var(--course-primary);
}

.courses-app-clean .practice-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 0;
}

.courses-app-clean .practice-subtitle {
    font-size: 0.8rem;
    color: var(--course-text-muted);
    margin-bottom: 0;
}

.courses-app-clean .question-counter {
    font-size: 0.85rem;
    color: var(--course-text-muted);
}

.courses-app-clean .practice-progress {
    height: 3px;
    border-radius: 0;
    background: var(--course-border);
    margin-top: 0.75rem;
}

.courses-app-clean .practice-progress .progress-bar {
    background: var(--course-success);
}

.courses-app-clean .practice-loading,
.courses-app-clean .practice-empty {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--course-text-muted);
}

/* Question Card */
.courses-app-clean .question-card {
    background: var(--course-card);
    border-radius: 8px;
    padding: 1.75rem;
    box-shadow: var(--course-shadow);
    max-width: 800px;
    margin: 0 auto;
    border: 1px solid var(--course-border);
}

.courses-app-clean .question-text {
    font-size: 1rem;
    color: var(--course-text);
    margin-bottom: 1.25rem;
    line-height: 1.7;
}

/* MCQ Options */
.courses-app-clean .mcq-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.courses-app-clean .mcq-option {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    background: var(--course-bg);
    border: 1px solid var(--course-border);
    border-radius: 6px;
    text-align: left;
    cursor: pointer;
}

.courses-app-clean .mcq-option:hover:not(:disabled) {
    border-color: var(--course-primary);
}

.courses-app-clean .mcq-option.selected {
    border-color: var(--course-primary);
    background: rgba(15, 118, 110, 0.04);
}

.courses-app-clean .mcq-option.correct {
    border-color: var(--course-success);
    background: #dcfce7;
}

.courses-app-clean .mcq-option.incorrect {
    border-color: var(--course-danger);
    background: #fee2e2;
}

.courses-app-clean .option-letter {
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--course-card);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--course-text);
    border: 1px solid var(--course-border);
}

.courses-app-clean .short-answer input {
    padding: 0.75rem;
    border: 1px solid var(--course-border);
    border-radius: 6px;
    font-size: 0.95rem;
}

.courses-app-clean .short-answer input:focus {
    border-color: var(--course-primary);
    outline: none;
    box-shadow: 0 0 0 2px rgba(15, 118, 110, 0.1);
}

/* Answer Feedback */
.courses-app-clean .answer-feedback {
    margin-top: 1.25rem;
    padding: 1rem;
    border-radius: 6px;
}

.courses-app-clean .answer-feedback.correct {
    background: #dcfce7;
    border: 1px solid #bbf7d0;
}

.courses-app-clean .answer-feedback.incorrect {
    background: #fee2e2;
    border: 1px solid #fecaca;
}

.courses-app-clean .feedback-header {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.courses-app-clean .answer-feedback.correct .feedback-header { color: var(--course-success); }
.courses-app-clean .answer-feedback.incorrect .feedback-header { color: var(--course-danger); }

.courses-app-clean .solution {
    background: var(--course-card);
    border-radius: 6px;
    padding: 0.875rem;
}

.courses-app-clean .solution h5 {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--course-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.4px;
    margin-bottom: 0.5rem;
}

.courses-app-clean .question-actions {
    margin-top: 1.25rem;
    text-align: center;
}

.courses-app-clean .btn-check-answer {
    padding: 0.625rem 1.5rem;
    background: var(--course-primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
}

.courses-app-clean .btn-check-answer:hover {
    background: var(--course-primary-dark);
}

/* Self-Rating */
.courses-app-clean .self-rating p {
    margin-bottom: 0.75rem;
    color: var(--course-text-muted);
}

.courses-app-clean .self-rating .rating-options {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.courses-app-clean .self-rating .rating-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    padding: 0.625rem 0.875rem;
    min-width: 72px;
}

.courses-app-clean .self-rating .rating-btn i {
    font-size: 1.25rem;
}

.courses-app-clean .rating-btn.again { border-color: #ef4444; }
.courses-app-clean .rating-btn.again:hover { background: #ef4444; color: white; }
.courses-app-clean .rating-btn.hard { border-color: #3b82f6; }
.courses-app-clean .rating-btn.hard:hover { background: #3b82f6; color: white; }
.courses-app-clean .rating-btn.good { border-color: #16a34a; }
.courses-app-clean .rating-btn.good:hover { background: #16a34a; color: white; }
.courses-app-clean .rating-btn.easy { border-color: #d97706; }
.courses-app-clean .rating-btn.easy:hover { background: #d97706; color: white; }

.courses-app-clean .rating-prompt {
    font-weight: 600;
    color: var(--course-text);
    margin-bottom: 0.2rem;
}

.courses-app-clean .rating-hint {
    font-size: 0.8rem;
    color: var(--course-text-muted);
}

/* Question Group Tabs */
.courses-app-clean .question-group-tabs {
    display: flex;
    justify-content: center;
    gap: 0.375rem;
    margin-bottom: 1.25rem;
}

.courses-app-clean .group-tab {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--course-border);
    background: var(--course-card);
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--course-text-muted);
    cursor: pointer;
}

.courses-app-clean .group-tab:hover:not(:disabled) {
    border-color: var(--course-primary);
}

.courses-app-clean .group-tab.active {
    border-color: var(--course-primary);
    background: var(--course-primary);
    color: white;
}

.courses-app-clean .group-tab.completed { border-color: var(--course-success); }
.courses-app-clean .group-tab:disabled { opacity: 0.4; cursor: not-allowed; }
.courses-app-clean .group-icon { font-size: 0.9rem; }

/* Question Metadata */
.courses-app-clean .question-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-bottom: 0.75rem;
}

.courses-app-clean .meta-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.2rem;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    font-size: 0.7rem;
    font-weight: 600;
}

.courses-app-clean .meta-badge.difficulty { background: #e0f2fe; color: #0369a1; }
.courses-app-clean .meta-badge.difficulty-routine { background: #dcfce7; color: #15803d; }
.courses-app-clean .meta-badge.difficulty-familiar { background: #e0f2fe; color: #0369a1; }
.courses-app-clean .meta-badge.difficulty-unfamiliar { background: #fef3c7; color: #b45309; }
.courses-app-clean .meta-badge.difficulty-complex { background: #fce7f3; color: #be185d; }
.courses-app-clean .meta-badge.marks { background: #fef3c7; color: #b45309; }
.courses-app-clean .meta-badge.topic { background: var(--course-bg-dark); color: var(--course-text-muted); }

.courses-app-clean .difficulty-badge {
    display: inline-block;
    padding: 0.125rem 0.4rem;
    border-radius: 3px;
    font-size: 0.65rem;
    font-weight: 600;
    margin-right: 0.375rem;
}

.courses-app-clean .difficulty-badge.difficulty-routine { background: #dcfce7; color: #15803d; }
.courses-app-clean .difficulty-badge.difficulty-familiar { background: #e0f2fe; color: #0369a1; }
.courses-app-clean .difficulty-badge.difficulty-unfamiliar { background: #fef3c7; color: #b45309; }
.courses-app-clean .difficulty-badge.difficulty-complex { background: #fce7f3; color: #be185d; }

/* Multi-Part Questions */
.courses-app-clean .parts-indicator {
    background: var(--course-bg-dark);
    border-radius: 6px;
    padding: 0.875rem;
    margin-bottom: 1.25rem;
}

.courses-app-clean .parts-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.courses-app-clean .parts-label {
    font-weight: 600;
    color: var(--course-text);
    font-size: 0.85rem;
}

.courses-app-clean .parts-progress {
    font-size: 0.8rem;
    color: var(--course-text-muted);
}

.courses-app-clean .parts-tabs {
    display: flex;
    gap: 0.375rem;
    flex-wrap: wrap;
}

.courses-app-clean .part-tab {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.375rem 0.75rem;
    border: 1px solid var(--course-border);
    background: var(--course-card);
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.825rem;
}

.courses-app-clean .part-tab:hover { border-color: var(--course-primary); }

.courses-app-clean .part-tab.active {
    border-color: var(--course-primary);
    background: var(--course-primary);
    color: white;
}

.courses-app-clean .part-tab.completed {
    border-color: var(--course-success);
    background: #dcfce7;
    color: #15803d;
}

.courses-app-clean .part-letter { font-size: 0.85rem; }

.courses-app-clean .part-marks {
    font-size: 0.7rem;
    background: rgba(0, 0, 0, 0.06);
    padding: 0.05rem 0.3rem;
    border-radius: 2px;
}

/* Question Context */
.courses-app-clean .question-context {
    background: var(--course-bg);
    border-left: 3px solid var(--course-primary);
    padding: 0.875rem 1rem;
    border-radius: 0 6px 6px 0;
    margin-bottom: 1.25rem;
    font-style: italic;
    color: var(--course-text);
    line-height: 1.6;
}

/* Solution Section */
.courses-app-clean .solution-section { margin-top: 0.75rem; }

.courses-app-clean .solution-tabs {
    display: flex;
    gap: 0.375rem;
    margin-bottom: 0.75rem;
    border-bottom: 1px solid var(--course-border);
    padding-bottom: 0.375rem;
}

.courses-app-clean .solution-tab {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.375rem 0.75rem;
    border: none;
    background: transparent;
    font-weight: 600;
    color: var(--course-text-muted);
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.825rem;
}

.courses-app-clean .solution-tab:hover { background: var(--course-bg-dark); }

.courses-app-clean .solution-tab.active {
    background: var(--course-primary);
    color: white;
}

.courses-app-clean .solution-content,
.courses-app-clean .mark-scheme-content {
    background: var(--course-bg);
    border-radius: 6px;
    padding: 1rem;
    line-height: 1.7;
}

.courses-app-clean .mark-scheme-content {
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 0.85rem;
}

/* Review Theory Card */
.courses-app-clean .review-theory-card {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    background: #fefdf5;
    border-left: 3px solid var(--course-accent);
    padding: 0.875rem 1rem;
    border-radius: 0 6px 6px 0;
    margin-top: 0.75rem;
}

.courses-app-clean .review-theory-card i { font-size: 1.1rem; color: var(--course-accent); }

.courses-app-clean .review-theory-card span {
    flex-grow: 1;
    color: #78350f;
    font-weight: 500;
    font-size: 0.875rem;
}

/* Part Navigation */
.courses-app-clean .part-navigation { text-align: center; }

.courses-app-clean .part-complete-msg {
    margin-bottom: 0.75rem;
    color: var(--course-text);
    font-weight: 500;
}

.courses-app-clean .btn-next-part {
    padding: 0.625rem 1.25rem;
    background: var(--course-primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
}

.courses-app-clean .btn-next-part:hover {
    background: var(--course-primary-dark);
}

/* Performance Summary */
.courses-app-clean .performance-summary {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--course-border);
}

.courses-app-clean .performance-summary h5 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 0.75rem;
}

.courses-app-clean .rating-breakdown {
    display: flex;
    justify-content: center;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.courses-app-clean .rating-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.courses-app-clean .rating-icon { font-size: 1.1rem; }
.courses-app-clean .rating-count { font-weight: 600; color: var(--course-text); }

/* Next Steps */
.courses-app-clean .next-steps {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--course-border);
}

.courses-app-clean .next-steps h5 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 0.75rem;
}

.courses-app-clean .next-options {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}

.courses-app-clean .next-options .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.85rem;
    text-decoration: none;
}

.courses-app-clean .btn-review {
    background: #fef3c7;
    color: #b45309;
    border: 1px solid #fcd34d;
}

.courses-app-clean .btn-review:hover {
    background: #fcd34d;
    color: #78350f;
}

.courses-app-clean .btn-retry {
    background: var(--course-bg-dark);
    color: var(--course-text);
    border: 1px solid var(--course-border);
}

.courses-app-clean .btn-retry:hover {
    border-color: var(--course-primary);
    color: var(--course-primary);
}

.courses-app-clean .btn-theory {
    background: #e0f2fe;
    color: #0369a1;
    border: 1px solid #7dd3fc;
}

.courses-app-clean .btn-theory:hover {
    background: #7dd3fc;
    color: #0c4a6e;
}

.courses-app-clean .btn-continue {
    background: var(--course-primary);
    color: white;
    border: 1px solid var(--course-primary);
}

.courses-app-clean .btn-continue:hover {
    background: var(--course-primary-dark);
    border-color: var(--course-primary-dark);
}

/* Practice Complete */
.courses-app-clean .practice-complete {
    text-align: center;
    padding: 3rem 2rem;
    background: var(--course-card);
    border-radius: 8px;
    box-shadow: var(--course-shadow);
    max-width: 560px;
    margin: 0 auto;
    border: 1px solid var(--course-border);
}

.courses-app-clean .complete-icon {
    font-size: 3rem;
    color: var(--course-success);
    margin-bottom: 0.75rem;
}

.courses-app-clean .practice-complete h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 1.25rem;
}

.courses-app-clean .practice-stats {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.courses-app-clean .practice-stats .stat { text-align: center; }

.courses-app-clean .practice-stats .stat-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--course-primary);
}

.courses-app-clean .practice-stats .stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--course-text-muted);
    text-transform: uppercase;
}

/* Question Nav Pills */
.courses-app-clean .question-nav-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    margin-top: 0.75rem;
    justify-content: center;
}

.courses-app-clean .q-nav-pill {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid var(--course-border);
    background: var(--course-card);
    color: var(--course-text-muted);
    font-size: 0.7rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.courses-app-clean .q-nav-pill:hover {
    border-color: var(--course-primary);
    color: var(--course-primary);
}

.courses-app-clean .q-nav-pill.active {
    background: var(--course-primary);
    border-color: var(--course-primary);
    color: white;
}

.courses-app-clean .q-nav-pill.completed {
    background: var(--course-success);
    border-color: var(--course-success);
    color: white;
}

.courses-app-clean .q-nav-pill.needs-review {
    background: #fef3c7;
    border-color: #f59e0b;
    color: #b45309;
}

.courses-app-clean .q-nav-pill.skipped {
    background: var(--course-bg-dark);
    border-color: var(--course-border);
    color: var(--course-text-muted);
}

/* =====================================================
   LEARNING PHASES (I Do / We Do / You Do)
   ===================================================== */

.courses-app-clean .learning-phase-tabs {
    display: flex;
    justify-content: center;
    gap: 0.375rem;
    margin-bottom: 1.25rem;
    padding: 0.375rem;
    background: var(--course-bg-dark);
    border-radius: 8px;
}

.courses-app-clean .phase-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.1rem;
    padding: 0.625rem 1rem;
    border: 1px solid transparent;
    background: var(--course-card);
    border-radius: 6px;
    cursor: pointer;
    min-width: 80px;
}

.courses-app-clean .phase-tab i {
    font-size: 1.1rem;
    color: var(--course-text-muted);
}

.courses-app-clean .phase-tab span {
    font-weight: 600;
    font-size: 0.825rem;
    color: var(--course-text);
}

.courses-app-clean .phase-tab small {
    font-size: 0.65rem;
    color: var(--course-text-muted);
}

.courses-app-clean .phase-tab:hover {
    border-color: var(--course-primary);
}

.courses-app-clean .phase-tab.active {
    border-color: var(--course-primary);
    background: rgba(15, 118, 110, 0.06);
}

.courses-app-clean .phase-tab.active i {
    color: var(--course-primary);
}

.courses-app-clean .phase-badge {
    text-transform: uppercase;
    font-size: 0.65rem;
    letter-spacing: 0.4px;
}

.courses-app-clean .phase-badge.example { background: #e0f2fe; color: #0369a1; }
.courses-app-clean .phase-badge.guided { background: #fef3c7; color: #b45309; }
.courses-app-clean .phase-badge.independent { background: #dcfce7; color: #15803d; }

/* Cognitive Helper */
.courses-app-clean .cognitive-helper {
    background: #fafdf5;
    border: 1px solid #d9f99d;
    border-radius: 6px;
    margin-bottom: 1.25rem;
    overflow: hidden;
}

.courses-app-clean .cognitive-helper .helper-header {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.625rem 0.875rem;
    cursor: pointer;
    font-weight: 600;
    color: #3f6212;
    font-size: 0.85rem;
}

.courses-app-clean .cognitive-helper .helper-header i:first-child {
    font-size: 1rem;
}

.courses-app-clean .cognitive-helper .helper-header span {
    flex-grow: 1;
}

.courses-app-clean .cognitive-helper .helper-content {
    padding: 0 0.875rem 0.875rem;
    color: #4d7c0f;
    font-size: 0.85rem;
    line-height: 1.6;
}

.courses-app-clean .cognitive-helper .helper-content p {
    margin-bottom: 0.375rem;
}

.courses-app-clean .cognitive-helper .helper-content p:last-child {
    margin-bottom: 0;
}

/* Worked Example Display */
.courses-app-clean .worked-example-display {
    border: 1px solid #bfdbfe;
    border-radius: 8px;
    overflow: hidden;
}

.courses-app-clean .example-label {
    background: #e0f2fe;
    padding: 0.625rem 0.875rem;
    font-weight: 600;
    color: #0369a1;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
}

.courses-app-clean .example-question {
    padding: 1rem;
    background: var(--course-bg);
    border-bottom: 1px solid var(--course-border);
}

.courses-app-clean .example-solution { padding: 1rem; }

.courses-app-clean .example-solution .solution-steps { line-height: 1.8; }

.courses-app-clean .example-actions {
    padding: 0.75rem 1rem;
    background: var(--course-bg);
    border-top: 1px solid var(--course-border);
    text-align: center;
}

.courses-app-clean .btn-try-similar {
    background: var(--course-primary);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.85rem;
}

.courses-app-clean .btn-try-similar:hover {
    background: var(--course-primary-dark);
}

/* Scaffolding Hint */
.courses-app-clean .scaffolding-hint {
    margin: 1.25rem 0;
    padding: 0.875rem;
    background: #fefdf5;
    border: 1px solid #fde68a;
    border-radius: 6px;
}

.courses-app-clean .hint-toggle-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: none;
    border: none;
    color: #b45309;
    font-weight: 600;
    cursor: pointer;
    padding: 0;
    font-size: 0.85rem;
}

.courses-app-clean .hint-toggle-btn:hover {
    color: #92400e;
}

/* =====================================================
   CLEAN-THEME SPECIFIC CLASSES
   Clean dashboard layout when using dedicated templates
   ===================================================== */

.courses-app-clean .clean-page-header {
    text-align: center;
    padding: 2rem 0 1.5rem;
}

.courses-app-clean .clean-page-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--course-text);
    margin-bottom: 0.25rem;
}

.courses-app-clean .clean-page-header p {
    font-size: 0.95rem;
    color: var(--course-text-muted);
}

.courses-app-clean .clean-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--course-border);
    margin-bottom: 1.5rem;
    background: var(--course-card);
    border-radius: 8px;
}

.courses-app-clean .clean-header-info {
    flex: 1;
    min-width: 0;
}

.courses-app-clean .clean-course-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
    color: var(--course-text);
    line-height: 1.3;
}

.courses-app-clean .clean-programme-badge {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--course-text-muted);
    background: var(--course-bg-dark);
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    margin-top: 0.25rem;
}

.courses-app-clean .clean-progress-summary {
    margin-bottom: 1.5rem;
    padding: 0.75rem 0;
}

.courses-app-clean .clean-progress-text {
    font-size: 0.875rem;
    color: var(--course-text-muted);
    display: block;
    margin-bottom: 0.5rem;
}

.courses-app-clean .clean-progress-bar-full {
    width: 100%;
    height: 4px;
    background: var(--course-border);
    border-radius: 2px;
    overflow: hidden;
}

.courses-app-clean .clean-progress-fill-full {
    height: 100%;
    background: var(--course-primary);
    border-radius: 2px;
}

.courses-app-clean .clean-modules {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.courses-app-clean .clean-module-card {
    background: var(--course-card);
    border: 1px solid var(--course-border);
    border-radius: 8px;
    overflow: hidden;
}

.courses-app-clean .clean-module-locked {
    opacity: 0.5;
}

.courses-app-clean .clean-module-header {
    display: flex;
    align-items: center;
    padding: 1rem 1.25rem;
    cursor: pointer;
    gap: 1rem;
    user-select: none;
}

.courses-app-clean .clean-module-header:hover {
    background: var(--course-bg);
}

.courses-app-clean .clean-module-info {
    flex: 1;
    min-width: 0;
}

.courses-app-clean .clean-module-number {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--course-text-muted);
    font-weight: 600;
}

.courses-app-clean .clean-module-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--course-text);
    margin: 0.15rem 0 0;
    line-height: 1.3;
}

.courses-app-clean .clean-lock-icon {
    font-size: 0.8rem;
    color: var(--course-text-muted);
}

.courses-app-clean .clean-module-desc {
    font-size: 0.8rem;
    color: var(--course-text-muted);
    margin: 0.25rem 0 0;
    line-height: 1.4;
}

.courses-app-clean .clean-module-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.4rem;
    flex-shrink: 0;
}

.courses-app-clean .clean-lesson-count {
    font-size: 0.8rem;
    color: var(--course-text-muted);
    white-space: nowrap;
}

.courses-app-clean .clean-progress-bar {
    width: 80px;
    height: 4px;
    background: var(--course-border);
    border-radius: 2px;
    overflow: hidden;
}

.courses-app-clean .clean-progress-fill {
    height: 100%;
    background: var(--course-primary);
    border-radius: 2px;
}

.courses-app-clean .clean-collapse-icon {
    color: var(--course-text-muted);
    font-size: 0.75rem;
    flex-shrink: 0;
}

.courses-app-clean .clean-lesson-list {
    border-top: 1px solid var(--course-bg-dark);
}

.courses-app-clean .clean-lesson-item {
    display: flex;
    align-items: center;
    padding: 0.7rem 1.25rem 0.7rem 2rem;
    text-decoration: none;
    color: var(--course-text);
    gap: 0.75rem;
    border-bottom: 1px solid var(--course-bg);
    font-size: 0.9rem;
}

.courses-app-clean .clean-lesson-item:last-child {
    border-bottom: none;
}

.courses-app-clean .clean-lesson-item:hover {
    background: var(--course-bg);
    color: var(--course-text);
    text-decoration: none;
}

.courses-app-clean .clean-lesson-item.completed .clean-lesson-title {
    color: var(--course-text-muted);
}

.courses-app-clean .clean-lesson-status {
    flex-shrink: 0;
    width: 1.25rem;
    text-align: center;
    font-size: 0.9rem;
}

.courses-app-clean .clean-lesson-title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.courses-app-clean .clean-lesson-duration {
    font-size: 0.75rem;
    color: var(--course-text-muted);
    flex-shrink: 0;
}

.courses-app-clean .clean-course-card {
    background: var(--course-card);
    border: 1px solid var(--course-border);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.courses-app-clean .clean-course-card-body {
    padding: 1.5rem;
    flex: 1;
}

.courses-app-clean .clean-course-card-body .clean-course-title {
    font-size: 1.15rem;
    margin: 0.5rem 0 0.25rem;
}

.courses-app-clean .clean-course-desc {
    font-size: 0.85rem;
    color: var(--course-text-muted);
    margin: 0 0 0.75rem;
    line-height: 1.5;
}

.courses-app-clean .clean-course-meta {
    font-size: 0.8rem;
    color: var(--course-text-muted);
}

.courses-app-clean .clean-course-card-footer {
    padding: 0 1.5rem 1.25rem;
}

.courses-app-clean .clean-card-progress {
    height: 3px;
    background: var(--course-border);
}

.courses-app-clean .clean-card-progress-fill {
    height: 100%;
    background: var(--course-primary);
}

/* Confidence rating modal */
.courses-app-clean .confidence-rating .confidence-btn {
    border-radius: 6px;
    font-weight: 600;
}

.courses-app-clean .confidence-labels {
    font-size: 0.7rem;
}

/* =====================================================
   EMPTY STATES
   ===================================================== */

.courses-app-clean .empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--course-text-muted);
}

.courses-app-clean .empty-state i {
    opacity: 0.3;
}

.courses-app-clean .empty-state h4 {
    color: var(--course-text);
    font-weight: 600;
    margin-top: 0.75rem;
}

/* =====================================================
   RESPONSIVE
   ===================================================== */

@media (max-width: 768px) {
    .courses-app-clean .course-hero-title {
        font-size: 1.5rem;
    }

    .courses-app-clean .slide-nav-pills {
        gap: 0.25rem;
    }

    .courses-app-clean .slide-pill {
        width: 26px;
        height: 26px;
        font-size: 0.7rem;
    }

    .courses-app-clean .slide-content-wrapper {
        padding: 1rem;
    }

    .courses-app-clean .slide-navigation {
        flex-direction: column;
        gap: 0.75rem;
    }

    .courses-app-clean .slide-nav-center {
        order: -1;
        width: 100%;
    }

    .courses-app-clean .btn-slide-nav {
        width: 100%;
        justify-content: center;
    }

    .courses-app-clean .btn-prev { order: 1; }
    .courses-app-clean .btn-next { order: 2; }

    .courses-app-clean .complete-actions {
        flex-direction: column;
    }

    .courses-app-clean .complete-actions .btn {
        width: 100%;
    }

    .courses-app-clean .lesson-content {
        padding: 1.25rem;
    }

    .courses-app-clean .page-label {
        display: none;
    }

    .courses-app-clean .page-type-icon {
        padding: 0.35rem 0.5rem;
    }

    .courses-app-clean .page-icon-btn .page-icon-label {
        display: none;
    }

    .courses-app-clean .page-icon-btn {
        padding: 0.3rem 0.5rem;
    }
}

@media (max-width: 576px) {
    .courses-app-clean .clean-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .courses-app-clean .clean-module-header {
        flex-wrap: wrap;
    }

    .courses-app-clean .clean-module-meta {
        flex-direction: row;
        align-items: center;
        width: 100%;
        margin-top: 0.25rem;
    }

    .courses-app-clean .clean-progress-bar {
        flex: 1;
    }

    .courses-app-clean .stats-circles {
        gap: 1rem;
        flex-wrap: wrap;
    }
}

/* =====================================================
   PRINT STYLES
   ===================================================== */

@media print {
    .courses-app-clean {
        background: white;
    }

    .courses-app-clean .course-header,
    .courses-app-clean .stats-badges-bar,
    .courses-app-clean .slide-navigation,
    .courses-app-clean .block-nav {
        display: none;
    }

    .courses-app-clean .lesson-content,
    .courses-app-clean .slide-content-wrapper {
        box-shadow: none;
        border: none;
    }
}

/* =====================================================
   CLEAN-PREFIXED CLASSES (for clean dashboard/list templates)
   ===================================================== */

.clean-page-header {
    text-align: center;
    padding: 2rem 0 1.5rem;
}
.clean-page-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 0.25rem;
}

.clean-dashboard { background: #fafbfc; min-height: 80vh; }

.clean-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 1.25rem 1.5rem; border-bottom: 1px solid #e5e7eb;
    margin-bottom: 1.5rem; background: #fff; border-radius: 8px;
}
.clean-header-info { flex: 1; min-width: 0; }
.clean-header-action .btn { font-weight: 500; }

.clean-course-title { font-size: 1.5rem; font-weight: 600; margin: 0; color: #1f2937; line-height: 1.3; }

.clean-programme-badge {
    display: inline-block; font-size: 0.75rem; color: #6b7280;
    background: #f3f4f6; padding: 0.15rem 0.5rem; border-radius: 3px; margin-top: 0.25rem;
}

.clean-progress-summary { margin-bottom: 1.5rem; padding: 0.75rem 0; }
.clean-progress-text { font-size: 0.875rem; color: #6b7280; display: block; margin-bottom: 0.5rem; }
.clean-progress-bar-full { width: 100%; height: 4px; background: #e5e7eb; border-radius: 2px; overflow: hidden; }
.clean-progress-fill-full { height: 100%; background: #0f766e; border-radius: 2px; transition: width 0.3s ease; }

.clean-modules { display: flex; flex-direction: column; gap: 0.75rem; }
.clean-module-card { background: #fff; border: 1px solid #e5e7eb; border-radius: 8px; overflow: hidden; }
.clean-module-locked { opacity: 0.5; }

.clean-module-header {
    display: flex; align-items: center; padding: 1rem 1.25rem;
    cursor: pointer; gap: 1rem; user-select: none;
}
.clean-module-header:hover { background: #f9fafb; }
.clean-module-info { flex: 1; min-width: 0; }
.clean-module-number { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.05em; color: #9ca3af; font-weight: 600; }
.clean-module-title { font-size: 1.05rem; font-weight: 600; color: #1f2937; margin: 0.15rem 0 0; line-height: 1.3; }
.clean-lock-icon { font-size: 0.8rem; color: #9ca3af; }
.clean-module-desc { font-size: 0.8rem; color: #9ca3af; margin: 0.25rem 0 0; line-height: 1.4; }

.clean-module-meta { display: flex; flex-direction: column; align-items: flex-end; gap: 0.4rem; flex-shrink: 0; }
.clean-lesson-count { font-size: 0.8rem; color: #6b7280; white-space: nowrap; }
.clean-progress-bar { width: 80px; height: 4px; background: #e5e7eb; border-radius: 2px; overflow: hidden; }
.clean-progress-fill { height: 100%; background: #0f766e; border-radius: 2px; }
.clean-collapse-icon { color: #9ca3af; font-size: 0.75rem; transition: transform 0.2s ease; flex-shrink: 0; }
.clean-module-header[aria-expanded="true"] .clean-collapse-icon,
.clean-module-header:not(.collapsed) .clean-collapse-icon { transform: rotate(180deg); }

.clean-lesson-list { border-top: 1px solid #f3f4f6; }
.clean-lesson-item {
    display: flex; align-items: center; padding: 0.7rem 1.25rem 0.7rem 2rem;
    text-decoration: none; color: #374151; gap: 0.75rem;
    border-bottom: 1px solid #f9fafb; font-size: 0.9rem;
}
.clean-lesson-item:last-child { border-bottom: none; }
.clean-lesson-item:hover { background: #f9fafb; color: #374151; text-decoration: none; }
.clean-lesson-item.completed .clean-lesson-title { color: #6b7280; }
.clean-lesson-status { flex-shrink: 0; width: 1.25rem; text-align: center; font-size: 0.9rem; }
.clean-lesson-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.clean-lesson-duration { font-size: 0.75rem; flex-shrink: 0; }

.clean-course-card {
    background: #fff; border: 1px solid #e5e7eb; border-radius: 8px;
    overflow: hidden; display: flex; flex-direction: column; height: 100%;
}
.clean-course-card-body { padding: 1.5rem; flex: 1; }
.clean-course-card-body .clean-course-title { font-size: 1.15rem; margin: 0.5rem 0 0.25rem; }
.clean-course-desc { font-size: 0.85rem; color: #6b7280; margin: 0 0 0.75rem; line-height: 1.5; }
.clean-course-meta { font-size: 0.8rem; color: #9ca3af; }
.clean-course-card-footer { padding: 0 1.5rem 1.25rem; }
.clean-card-progress { height: 3px; background: #e5e7eb; }
.clean-card-progress-fill { height: 100%; background: #0f766e; }

@media (max-width: 576px) {
    .clean-header { flex-direction: column; align-items: flex-start; gap: 0.75rem; }
    .clean-module-header { flex-wrap: wrap; }
    .clean-module-meta { flex-direction: row; align-items: center; width: 100%; margin-top: 0.25rem; }
    .clean-progress-bar { flex: 1; }
}