/**
 * === COURSE-PAGE.CSS ===
 * /assets/css/course-page.css
 * НАЗНАЧЕНИЕ: Стили для страниц курсов и уроков
 * СВЯЗИ: style.css, journey-map.css, course-page.js
 * РАЗМЕР: ~550 строк
 */

/* ============================================
   COURSE PAGE CONTAINER
   ============================================ */

.course-page {
    min-height: 100vh;
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
    padding: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

/* Background gradient — JS sets class="location-bg-{type}" */
.course-page::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 400px;
    pointer-events: none;
    z-index: 0;
}

.course-page.location-bg-gateway::before { background: linear-gradient(180deg, rgba(255, 215, 0, 0.12) 0%, transparent 100%); }
.course-page.location-bg-lake::before { background: linear-gradient(180deg, rgba(74, 144, 217, 0.12) 0%, transparent 100%); }
.course-page.location-bg-cave::before { background: linear-gradient(180deg, rgba(139, 92, 246, 0.12) 0%, transparent 100%); }
.course-page.location-bg-tower::before { background: linear-gradient(180deg, rgba(245, 158, 11, 0.12) 0%, transparent 100%); }
.course-page.location-bg-garden::before { background: linear-gradient(180deg, rgba(16, 185, 129, 0.12) 0%, transparent 100%); }
.course-page.location-bg-mountain::before { background: linear-gradient(180deg, rgba(14, 165, 233, 0.12) 0%, transparent 100%); }
.course-page.location-bg-temple::before { background: linear-gradient(180deg, rgba(239, 68, 68, 0.12) 0%, transparent 100%); }
.course-page.location-bg-portal::before { background: linear-gradient(180deg, rgba(236, 72, 153, 0.12) 0%, transparent 100%); }
.course-page.location-bg-monastery::before { background: linear-gradient(180deg, rgba(20, 184, 166, 0.12) 0%, transparent 100%); }
.course-page.location-bg-forest::before { background: linear-gradient(180deg, rgba(34, 197, 94, 0.12) 0%, transparent 100%); }
.course-page.location-bg-field::before { background: linear-gradient(180deg, rgba(234, 179, 8, 0.12) 0%, transparent 100%); }
.course-page.location-bg-peak::before { background: linear-gradient(180deg, rgba(99, 102, 241, 0.12) 0%, transparent 100%); }
.course-page.location-bg-arena::before { background: linear-gradient(180deg, rgba(249, 115, 22, 0.12) 0%, transparent 100%); }
.course-page.location-bg-meadow::before { background: linear-gradient(180deg, rgba(219, 39, 119, 0.12) 0%, transparent 100%); }
.course-page.location-bg-library::before { background: linear-gradient(180deg, rgba(124, 58, 237, 0.12) 0%, transparent 100%); }
.course-page.location-bg-camp::before { background: linear-gradient(180deg, rgba(59, 130, 246, 0.12) 0%, transparent 100%); }
.course-page.location-bg-gate::before { background: linear-gradient(180deg, rgba(168, 85, 247, 0.15) 0%, transparent 100%); }

.course-page > * {
    position: relative;
    z-index: 1;
}

/* ============================================
   BACK BUTTON — .btn-back-to-map
   ============================================ */

.btn-back-to-map {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-card);
    border-radius: 100px;
    border: 1px solid var(--border-color, #e5e5e5);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-body);
}

.btn-back-to-map:hover {
    color: var(--color-gold);
    border-color: var(--color-gold);
}

.btn-back-to-map svg {
    width: 18px;
    height: 18px;
}

/* ============================================
   COURSE HEADER — .course-page__header
   ============================================ */

.course-page__header {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    align-items: flex-start;
}

.course-page__icon {
    width: 100px;
    height: 100px;
    border-radius: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color, #e5e5e5);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    flex-shrink: 0;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
}

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

.course-page__number {
    display: inline-block;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-xs);
    background: var(--bg-secondary);
    padding: 2px 10px;
    border-radius: 100px;
}

.course-page__title {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: var(--spacing-sm) 0;
    line-height: 1.2;
}

.course-page__location {
    font-size: 0.9rem;
    color: var(--location-color, var(--color-gold));
    font-weight: 500;
    margin: 0;
}

/* ============================================
   DESCRIPTION — .course-page__description
   ============================================ */

.course-page__description {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color, #e5e5e5);
}

.course-page__description p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* ============================================
   MAIN TEXT — .course-page__main-text
   ============================================ */

.course-page__main-text {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(255, 215, 0, 0.06);
    border-radius: 12px;
    border: 1px solid rgba(255, 215, 0, 0.15);
}

.main-text-label {
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

.main-text-value {
    color: var(--text-secondary);
}

/* ============================================
   PROGRESS SECTION — .course-page__progress-section
   ============================================ */

.course-page__progress-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border-radius: 16px;
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--border-color, #e5e5e5);
    box-shadow: var(--shadow-sm);
}

/* SVG Progress Circle */
.progress-circle-large {
    position: relative;
    width: 140px;
    height: 140px;
    flex-shrink: 0;
}

.progress-circle-svg {
    display: block;
}

.progress-circle__bg {
    fill: none;
    stroke: var(--bg-secondary, #f0f0f0);
    stroke-width: 8;
}

.progress-circle__fill {
    fill: none;
    stroke: var(--location-color, var(--color-gold));
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s ease;
}

.progress-circle__inner {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.progress-percent {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.progress-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Progress Stats */
.progress-stats {
    display: flex;
    gap: var(--spacing-xl);
    flex: 1;
}

.progress-stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* ============================================
   LESSONS SECTION — .course-page__lessons
   ============================================ */

.course-page__lessons {
    margin-bottom: var(--spacing-xl);
}

.lessons-title {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 10px;
}

/* ============================================
   LESSON CARD — .lesson-card
   ============================================ */

.lesson-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color, #e5e5e5);
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0;
    animation: lessonFadeIn 0.4s ease forwards;
}

.lesson-card.animate-in {
    opacity: 1;
}

@keyframes lessonFadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.lesson-card:hover {
    border-color: var(--location-color, var(--color-gold));
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.lesson-card.completed {
    border-color: var(--color-success);
    background: rgba(16, 185, 129, 0.04);
}

.lesson-card.in-progress {
    border-color: var(--color-warning);
    background: rgba(245, 158, 11, 0.04);
}

.lesson-card.locked {
    opacity: 0.45;
    cursor: not-allowed;
}

.lesson-card.locked:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--border-color, #e5e5e5);
}

.lesson-card__number {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-muted);
    flex-shrink: 0;
}

.lesson-card.completed .lesson-card__number {
    background: var(--color-success);
    color: white;
}

.lesson-card.in-progress .lesson-card__number {
    background: var(--color-warning);
    color: white;
}

.lesson-card__content {
    flex: 1;
    min-width: 0;
}

.lesson-card__title {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    margin: 0 0 2px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lesson-card__description {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lesson-card__status {
    font-size: 1.2rem;
    flex-shrink: 0;
}

/* ============================================
   LESSON PAGE — .lesson-page
   ============================================ */

.lesson-page {
    min-height: 100vh;
    background: var(--bg-primary);
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.lesson-page > * {
    position: relative;
    z-index: 1;
}

/* Navigation */
.lesson-page__nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.btn-back-to-course {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-card);
    border-radius: 100px;
    border: 1px solid var(--border-color, #e5e5e5);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-body);
}

.btn-back-to-course:hover {
    color: var(--color-gold);
    border-color: var(--color-gold);
}

.btn-back-to-course svg {
    width: 18px;
    height: 18px;
}

.lesson-nav-arrows {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.lesson-nav-arrows button {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-color, #e5e5e5);
    background: var(--bg-card);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all 0.2s ease;
}

.lesson-nav-arrows button:hover:not(:disabled) {
    border-color: var(--color-gold);
    color: var(--color-gold);
}

.lesson-nav-arrows button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.lesson-nav-arrows button svg {
    width: 18px;
    height: 18px;
}

.lesson-nav-current {
    font-size: 0.85rem;
    color: var(--text-muted);
    min-width: 100px;
    text-align: center;
}

/* Lesson Header */
.lesson-page__header {
    margin-bottom: var(--spacing-lg);
}

.lesson-badge {
    display: inline-block;
    font-size: 0.8rem;
    color: var(--location-color, var(--color-gold));
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
    background: rgba(255, 215, 0, 0.08);
    padding: 4px 12px;
    border-radius: 100px;
}

.lesson-page__title {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.3;
}

/* Video */
.lesson-page__video {
    margin-bottom: var(--spacing-lg);
}

.video-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 */
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.video-wrapper iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.video-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    background: var(--bg-card);
    border-radius: 16px;
    border: 2px dashed var(--border-color, #e5e5e5);
    text-align: center;
}

.video-placeholder__icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.video-placeholder p {
    color: var(--text-muted);
    margin: 0;
}

/* Actions */
.lesson-page__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: var(--spacing-lg);
}

.lesson-page__actions .btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color, #e5e5e5);
    font-family: var(--font-body);
}

.lesson-page__actions .btn svg {
    width: 18px;
    height: 18px;
}

.lesson-page__actions .btn-outline {
    background: var(--bg-card);
    color: var(--text-primary);
}

.lesson-page__actions .btn-outline:hover {
    border-color: var(--color-gold);
}

.lesson-page__actions .btn-primary {
    background: var(--gradient-gold);
    border-color: var(--color-gold);
    color: var(--bg-dark);
    font-weight: 600;
}

.lesson-page__actions .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-gold);
}

/* Lesson content */
.lesson-page__content {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color, #e5e5e5);
}

.lesson-page__content h2 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-sm) 0;
}

.lesson-page__content p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* Materials grid */
.lesson-page__materials {
    margin-bottom: var(--spacing-xl);
}

.lesson-page__materials h2 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-md) 0;
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
}

.material-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-md);
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color, #e5e5e5);
    text-decoration: none;
    transition: all 0.2s ease;
}

.material-card:hover {
    border-color: var(--location-color, var(--color-gold));
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.material-icon {
    font-size: 2rem;
}

.material-name {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* ============================================
   LESSON DESCRIPTION
   ============================================ */

.lesson-page__desc {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin: var(--spacing-sm) 0 0 0;
    line-height: 1.5;
}

/* ============================================
   LESSON TABS — навигация по материалам
   ============================================ */

.lesson-tabs-wrap {
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color, #e5e5e5);
}

.lesson-tabs {
    display: flex;
    gap: 2px;
    flex-wrap: wrap;
}

.lesson-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-muted);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
    font-family: var(--font-body);
}

.lesson-tab:hover {
    color: var(--text-primary);
    background: var(--bg-secondary, rgba(255,255,255,0.04));
}

.lesson-tab.active {
    color: var(--location-color, var(--color-gold));
    border-bottom-color: var(--location-color, var(--color-gold));
}

.lesson-tab svg,
.lesson-tab i {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.tab-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary, rgba(255,255,255,0.08));
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 600;
    min-width: 20px;
    height: 18px;
    padding: 0 5px;
    border-radius: 100px;
}

.lesson-tab.active .tab-count {
    background: rgba(var(--location-color-rgb, 255,215,0), 0.15);
    color: var(--location-color, var(--color-gold));
}

/* ============================================
   TAB CONTENT AREA
   ============================================ */

.lesson-tab-content {
    min-height: 300px;
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   MARKDOWN CONTENT — .md-content
   ============================================ */

.md-content {
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color, #e5e5e5);
    color: var(--text-primary);
    line-height: 1.75;
    font-size: 0.95rem;
}

.md-content h1 {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-md) 0;
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color, #e5e5e5);
}

.md-content h2 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: var(--spacing-lg) 0 var(--spacing-sm) 0;
}

.md-content h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: var(--spacing-md) 0 var(--spacing-xs) 0;
}

.md-content h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: var(--spacing-sm) 0 var(--spacing-xs) 0;
}

.md-content p {
    color: var(--text-secondary);
    margin: 0 0 var(--spacing-sm) 0;
}

.md-content ul,
.md-content ol {
    margin: 0 0 var(--spacing-sm) 0;
    padding-left: 24px;
    color: var(--text-secondary);
}

.md-content li {
    margin-bottom: 4px;
}

.md-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.md-content em {
    color: var(--location-color, var(--color-gold));
    font-style: italic;
}

.md-content blockquote {
    margin: var(--spacing-sm) 0;
    padding: 10px 16px;
    border-left: 3px solid var(--location-color, var(--color-gold));
    background: rgba(255, 215, 0, 0.04);
    border-radius: 0 8px 8px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.md-content blockquote p {
    margin: 0;
}

.md-content code {
    background: var(--bg-secondary, rgba(255,255,255,0.06));
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.88em;
    font-family: 'JetBrains Mono', monospace;
    color: var(--color-primary);
}

.md-content pre {
    background: var(--bg-secondary, rgba(0,0,0,0.3));
    padding: var(--spacing-md);
    border-radius: 8px;
    overflow-x: auto;
    margin: var(--spacing-sm) 0;
}

.md-content pre code {
    background: none;
    padding: 0;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.md-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-sm) 0;
    font-size: 0.9rem;
}

.md-content table th,
.md-content table td {
    padding: 8px 10px;
    border: 1px solid var(--border-color, #e5e5e5);
    text-align: left;
}

.md-content table th {
    background: var(--bg-secondary, rgba(255,255,255,0.04));
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.85rem;
}

.md-content table td {
    color: var(--text-secondary);
}

.md-content table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.md-content hr {
    border: none;
    border-top: 1px solid var(--border-color, #e5e5e5);
    margin: var(--spacing-md) 0;
}

.md-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.md-content a:hover {
    color: var(--location-color, var(--color-gold));
}

.md-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: var(--spacing-sm) 0;
}

/* ============================================
   CARDS TAB — сводка и список
   ============================================ */

.cards-tab-overview {
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color, #e5e5e5);
}

.cards-stats-row {
    display: flex;
    gap: 10px;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.cards-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 10px 16px;
    background: var(--bg-secondary, rgba(255,255,255,0.04));
    border-radius: 10px;
    flex: 0 0 auto;
    min-width: 70px;
}

.cards-stat__num {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.cards-stat__label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.cards-tab-overview .btn-start-cards {
    margin-bottom: var(--spacing-md);
}

/* Card sections */
.cards-section {
    margin-bottom: var(--spacing-md);
}

.cards-section:last-child {
    margin-bottom: 0;
}

.cards-section__title {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-xs) 0;
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--border-color, #e5e5e5);
}

.cards-section__list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.card-preview {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    transition: background 0.15s ease;
}

.card-preview:hover {
    background: var(--bg-secondary, rgba(255,255,255,0.04));
}

.card-type-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 2px 8px;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    flex: 0 0 auto;
    white-space: nowrap;
}

.badge-simple {
    background: rgba(59, 130, 246, 0.12);
    color: #3b82f6;
}

.badge-quiz {
    background: rgba(168, 85, 247, 0.12);
    color: #a855f7;
}

.badge-matching {
    background: rgba(16, 185, 129, 0.12);
    color: #10b981;
}

.card-preview__q {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

/* ============================================
   TERMS TAB — таблица терминов
   ============================================ */

.terms-tab {
    overflow-x: auto;
}

.terms-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color, #e5e5e5);
}

.terms-table thead th {
    padding: 10px;
    background: var(--bg-secondary, rgba(255,255,255,0.04));
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    text-align: left;
    border-bottom: 1px solid var(--border-color, #e5e5e5);
}

.terms-table tbody td {
    padding: 10px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color, rgba(229,229,229,0.5));
    vertical-align: top;
}

.terms-table tbody tr:last-child td {
    border-bottom: none;
}

.terms-table tbody tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.terms-table td strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* ============================================
   HOMEWORK TOGGLE
   ============================================ */

.hw-question {
    margin-bottom: var(--spacing-sm);
}

.hw-toggle-answer {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 0.85rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background 0.15s ease;
}

.hw-toggle-answer:hover {
    background: var(--bg-secondary, rgba(255,255,255,0.04));
}

.hw-toggle-answer.open {
    color: var(--location-color, var(--color-gold));
}

.hw-answer {
    display: none;
    margin-top: var(--spacing-xs);
    padding: 10px;
    background: rgba(16, 185, 129, 0.04);
    border-radius: 8px;
    border-left: 3px solid var(--color-success, #10b981);
}

/* ============================================
   LOADING PLACEHOLDER
   ============================================ */

.loading-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.loader-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color, #e5e5e5);
    border-top-color: var(--location-color, var(--color-gold));
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

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

@media (max-width: 768px) {
    .course-page {
        padding: var(--spacing-md);
    }

    .course-page__header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .course-page__icon {
        width: 80px;
        height: 80px;
        font-size: 2.5rem;
    }

    .course-page__title {
        font-size: 1.5rem;
    }

    .course-page__progress-section {
        flex-direction: column;
        text-align: center;
    }

    .progress-stats {
        justify-content: center;
    }

    .lessons-grid {
        grid-template-columns: 1fr;
    }

    .lesson-page {
        padding: var(--spacing-md);
    }

    .lesson-page__nav {
        flex-direction: column;
        align-items: flex-start;
    }

    .lesson-page__title {
        font-size: 1.4rem;
    }

    .lesson-page__actions {
        flex-direction: column;
    }

    .materials-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .lesson-tab {
        padding: 8px 12px;
        font-size: 0.82rem;
    }

    .lesson-tab span {
        display: none;
    }

    .lesson-tab svg,
    .lesson-tab i {
        width: 20px;
        height: 20px;
    }

    .cards-stats-row {
        gap: 6px;
    }

    .cards-stat {
        padding: 8px 10px;
        min-width: 60px;
    }

    /* Terms table - card layout on mobile */
    .terms-table {
        font-size: 0.82rem;
    }

    .terms-table thead {
        display: none;
    }

    .terms-table tbody tr {
        display: flex;
        flex-direction: column;
        padding: 8px 10px;
        margin-bottom: 6px;
        border: 1px solid var(--border-color);
        border-radius: 8px;
        background: var(--bg-card);
    }

    .terms-table tbody td {
        display: block;
        padding: 2px 0;
        border-bottom: none;
    }

    .terms-table tbody td:first-child {
        font-weight: 600;
        color: var(--text-primary);
    }

    .md-content {
        padding: 10px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .materials-grid {
        grid-template-columns: 1fr 1fr;
    }

    .lesson-tab {
        padding: 8px 10px;
    }
}