/* ==========================================
   COURSE PLAYER - Video Learning Experience
   ========================================== */

/* Player Layout */
.player-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 0;
    height: calc(100vh - 70px);
    overflow: hidden;
}

@media (max-width: 1024px) {
    .player-layout {
        grid-template-columns: 1fr;
    }
}

/* Video Container */
.video-container {
    position: relative;
    background: #000;
    display: flex;
    flex-direction: column;
}

.video-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
    overflow: hidden;
}

.video-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0a0a12, #1a1a2e);
}

.video-placeholder i {
    font-size: 4rem;
    color: var(--color-primary);
    opacity: 0.6;
}

/* Video Controls Bar */
.video-controls {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-lg);
    background: rgba(0, 0, 0, 0.9);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.video-controls button {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: 1.2rem;
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-controls button:hover {
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.08);
}

.progress-scrubber {
    flex: 1;
    height: 4px;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 2px;
    cursor: pointer;
    position: relative;
}

.progress-scrubber-fill {
    height: 100%;
    width: 35%;
    background: var(--color-primary);
    border-radius: 2px;
    transition: width 0.1s linear;
}

.progress-scrubber:hover .progress-scrubber-fill {
    height: 6px;
    margin-top: -1px;
}

.time-display {
    font-size: 0.8rem;
    color: var(--color-text-dim);
    font-family: var(--font-family-ui);
    white-space: nowrap;
}

/* Below-Video Content */
.below-video {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-lg);
    scrollbar-width: thin;
    scrollbar-color: rgba(45, 184, 76, 0.3) transparent;
}

.lesson-title-bar {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.lesson-title-bar h1 {
    font-size: 1.3rem;
    font-weight: 600;
    line-height: 1.4;
}

.lesson-meta {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-glass-border);
}

.lesson-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.lesson-meta-item i {
    color: var(--color-primary);
}

/* Lesson Tabs */
.lesson-tabs {
    display: flex;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-glass-border);
}

.lesson-tab {
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-family: var(--font-family-primary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.lesson-tab:hover {
    color: var(--color-text);
}

.lesson-tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Notes Tab */
.notes-area {
    min-height: 200px;
    padding: var(--space-md);
    background: var(--color-glass);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 0.9rem;
    line-height: 1.6;
    resize: vertical;
    width: 100%;
    font-family: var(--font-family-primary);
}

.notes-area:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* Resources Tab */
.resource-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-glass);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.resource-item:hover {
    border-color: var(--color-primary);
    background: var(--color-glass-hover);
}

.resource-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: rgba(45, 184, 76, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.resource-icon i {
    color: var(--color-primary);
    font-size: 1.2rem;
}

.resource-info {
    flex: 1;
}

.resource-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
}

.resource-size {
    font-size: 0.78rem;
    color: var(--color-text-dim);
}

/* ==========================================
   LESSON SIDEBAR
   ========================================== */

.lesson-sidebar {
    background: var(--color-surface);
    border-left: 1px solid var(--color-glass-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

[dir="rtl"] .lesson-sidebar {
    border-left: none;
    border-right: 1px solid var(--color-glass-border);
}

@media (max-width: 1024px) {
    .lesson-sidebar {
        position: fixed;
        top: 0;
        right: 0;
        width: 340px;
        height: 100vh;
        z-index: 100;
        transform: translateX(100%);
        transition: transform 0.3s ease;
    }

    [dir="rtl"] .lesson-sidebar {
        right: auto;
        left: 0;
        transform: translateX(-100%);
    }

    .lesson-sidebar.open {
        transform: translateX(0);
    }
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-glass-border);
}

.sidebar-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.course-progress-bar {
    padding: var(--space-sm) var(--space-lg);
    border-bottom: 1px solid var(--color-glass-border);
}

.course-progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-xs);
    font-size: 0.78rem;
    color: var(--color-text-muted);
}

.course-progress-track {
    height: 4px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 2px;
}

.course-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent-gold));
    border-radius: 2px;
    transition: width 0.3s ease;
}

/* Lesson List */
.lesson-list {
    flex: 1;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(45, 184, 76, 0.3) transparent;
}

.chapter-group {
    border-bottom: 1px solid var(--color-glass-border);
}

.chapter-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text);
    cursor: pointer;
    transition: background 0.2s ease;
}

.chapter-title:hover {
    background: var(--color-glass);
}

.chapter-title i {
    color: var(--color-text-dim);
    transition: transform 0.2s ease;
}

.chapter-title.expanded i {
    transform: rotate(90deg);
}

.chapter-lessons {
    display: none;
}

.chapter-title.expanded+.chapter-lessons {
    display: block;
}

.lesson-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    padding-left: calc(var(--space-lg) + var(--space-md));
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    border-left: 3px solid transparent;
}

[dir="rtl"] .lesson-item {
    padding-left: var(--space-lg);
    padding-right: calc(var(--space-lg) + var(--space-md));
    border-left: none;
    border-right: 3px solid transparent;
}

.lesson-item:hover {
    background: var(--color-glass);
    color: var(--color-text);
}

.lesson-item.active {
    background: rgba(45, 184, 76, 0.08);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
}

[dir="rtl"] .lesson-item.active {
    border-right-color: var(--color-primary);
}

.lesson-item.completed {
    color: var(--color-text-dim);
}

.lesson-item .lesson-status {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--color-glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.7rem;
}

.lesson-item.completed .lesson-status {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.lesson-item.active .lesson-status {
    border-color: var(--color-primary);
    background: rgba(45, 184, 76, 0.15);
    color: var(--color-primary);
}

.lesson-duration {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--color-text-dim);
    white-space: nowrap;
}

[dir="rtl"] .lesson-duration {
    margin-left: 0;
    margin-right: auto;
}

/* Light Mode */
html[data-theme="light"] .video-controls {
    background: rgba(255, 255, 255, 0.95);
    border-top-color: rgba(0, 0, 0, 0.06);
}

html[data-theme="light"] .lesson-sidebar {
    background: rgba(255, 255, 255, 0.98);
    border-color: rgba(0, 0, 0, 0.06);
}