/* Course Page Styles */
.course-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 1rem;
    background: linear-gradient(135deg, var(--background) 0%, hsl(222, 47%, 9%) 100%);
    color: var(--foreground);
    min-height: calc(100vh - 200px);
}

.course-header {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

.course-header::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
}

.course-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--foreground);
}

.course-description {
    font-size: 1.125rem;
    color: var(--muted-foreground);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.course-meta {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.meta-item {
    color: var(--muted-foreground);
}

.meta-item strong {
    color: var(--foreground);
    margin-right: 0.5rem;
}

.prerequisites,
.learning-outcomes {
    margin-top: 2rem;
}

.prerequisites h2,
.learning-outcomes h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--foreground);
}

.prerequisites ul,
.learning-outcomes ul {
    list-style: none;
    padding-left: 0;
}

.prerequisites ul li,
.learning-outcomes ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.prerequisites ul li::before,
.learning-outcomes ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* Lesson Styles */
.course-content {
    margin-top: 2rem;
}

.course-content > h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--foreground);
}

.lesson {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border-radius: calc(var(--radius) * 2);
    padding: 2.25rem;
    margin-bottom: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.lesson::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.lesson::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent), #3b82f6);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.lesson:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(236, 72, 153, 0.2), 0 4px 12px rgba(139, 92, 246, 0.15);
    border-color: rgba(236, 72, 153, 0.4);
    background: rgba(255, 255, 255, 0.05);
}

.lesson:hover::before {
    opacity: 1;
}

.lesson:hover::after {
    transform: scaleX(1);
}

.lesson-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.lesson-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--foreground);
    margin: 0;
    flex: 1;
}

.lesson-duration {
    padding: 0.25rem 0.75rem;
    background: linear-gradient(to right, var(--primary), var(--accent));
    color: var(--primary-foreground);
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 600;
}

.lesson-content {
    margin-bottom: 1.5rem;
}

.lesson-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--foreground);
}

.lesson-content p:last-child {
    margin-bottom: 0;
}

/* Sections within lessons */
.key-concepts,
.learning-objectives,
.tips,
.pitfalls,
.summary,
.exercise {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.key-concepts h3,
.learning-objectives h3,
.tips h3,
.pitfalls h3,
.summary h3,
.exercise h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--foreground);
}

.key-concepts ul,
.learning-objectives ul,
.tips ul,
.pitfalls ul,
.summary ul {
    list-style: none;
    padding-left: 0;
}

.key-concepts ul li,
.learning-objectives ul li,
.tips ul li,
.pitfalls ul li,
.summary ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.6;
}

.key-concepts ul li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
    font-size: 1.5rem;
}

.tips ul li::before {
    content: "💡";
    position: absolute;
    left: 0;
}

.pitfalls ul li::before {
    content: "⚠️";
    position: absolute;
    left: 0;
}

.summary ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* Learning Objectives */
.objectives-master,
.objectives-develop {
    margin-top: 1rem;
}

.objectives-master h4,
.objectives-develop h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--muted-foreground);
    font-weight: 600;
}

.objectives-master ul,
.objectives-develop ul {
    list-style: none;
    padding-left: 1.5rem;
}

.objectives-master ul li,
.objectives-develop ul li {
    padding: 0.25rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.objectives-master ul li::before {
    content: "🎯";
    position: absolute;
    left: 0;
}

.objectives-develop ul li::before {
    content: "📈";
    position: absolute;
    left: 0;
}

/* Exercise */
.exercise-description {
    margin-bottom: 1rem;
    font-size: 1.125rem;
    line-height: 1.8;
}

.code-block {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border-radius: var(--radius);
    padding: 1.75rem;
    margin: 1.25rem 0;
    overflow-x: auto;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    position: relative;
}

.code-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0.5;
    border-radius: var(--radius) var(--radius) 0 0;
}

.code-block pre {
    margin: 0;
    color: #e2e8f0;
    font-family: 'JetBrains Mono', 'Courier New', Courier, monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

.code-block code {
    color: #e2e8f0;
}

.exercise-tips {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--muted);
    border-radius: var(--radius);
    border-left: 4px solid var(--warning-color);
}

.exercise-tips h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--foreground);
}

.exercise-tips ul {
    list-style: none;
    padding-left: 1.5rem;
}

.exercise-tips ul li {
    padding: 0.25rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.exercise-tips ul li::before {
    content: "💡";
    position: absolute;
    left: 0;
}

/* Course Page Specific Styles */
.course-header-card {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: calc(var(--radius) * 2);
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2), 0 2px 8px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.course-header-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent), #3b82f6);
}

.course-header-content {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.course-icon-wrapper {
    flex-shrink: 0;
}

.course-icon {
    width: 80px;
    height: 80px;
    border-radius: calc(var(--radius) * 1.5);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
}

.course-header-text {
    flex: 1;
}

.course-meta-info {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    margin: 1.5rem 0;
}

.course-meta-info .meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--muted-foreground);
}

.course-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.course-curriculum {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: calc(var(--radius) * 2);
    padding: 2rem;
    margin-bottom: 2rem;
}

.lessons-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.5rem;
}

.lesson-card {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.75rem;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--foreground);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.lesson-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary), var(--accent));
    transform: scaleY(0);
    transform-origin: top;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.lesson-card:hover {
    border-color: rgba(236, 72, 153, 0.4);
    background: rgba(255, 255, 255, 0.05);
    transform: translateX(8px) scale(1.02);
    box-shadow: 0 8px 24px rgba(236, 72, 153, 0.15), 0 4px 12px rgba(139, 92, 246, 0.1);
}

.lesson-card:hover::before {
    transform: scaleY(1);
}

.lesson-number {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: var(--primary-foreground);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3), 0 2px 4px rgba(139, 92, 246, 0.2);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.lesson-number::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lesson-card:hover .lesson-number {
    transform: rotate(360deg) scale(1.1);
    box-shadow: 0 6px 20px rgba(236, 72, 153, 0.4), 0 4px 8px rgba(139, 92, 246, 0.3);
}

.lesson-card:hover .lesson-number::before {
    opacity: 1;
}

.lesson-info {
    flex: 1;
}

.lesson-card .lesson-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0 0 0.25rem 0;
    color: var(--foreground);
}

.lesson-card .lesson-duration {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    margin: 0;
}

.lesson-arrow {
    color: var(--muted-foreground);
    font-size: 1.5rem;
}

.course-overview {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: calc(var(--radius) * 2);
    padding: 2rem;
}

.overview-section {
    margin-top: 2rem;
}

.overview-section h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--foreground);
}

/* Lesson Page Specific Styles */
.lesson-page {
    min-height: 100vh;
    background: var(--background);
}

.lesson-layout {
    display: flex;
    min-height: 100vh;
}

.lesson-content-side {
    width: 50%;
    padding: 2rem;
    overflow-y: auto;
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(10px);
    border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.lesson-editor-side {
    width: 50%;
    display: flex;
    flex-direction: column;
    background: var(--background);
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--muted);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--muted-foreground);
    margin-bottom: 2rem;
    transition: var(--transition);
}

.back-button:hover {
    background: var(--secondary);
    color: var(--foreground);
    border-color: var(--primary);
}

.lesson-header-info {
    margin-bottom: 2rem;
}

.lesson-main-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--foreground);
}

.lesson-meta-info {
    display: flex;
    gap: 1.5rem;
    color: var(--muted-foreground);
    font-size: 0.875rem;
}

.lesson-content-main {
    color: var(--foreground);
    line-height: 1.8;
}

.lesson-content-main .lesson {
    background: transparent;
    border: none;
    padding: 0;
    margin: 0;
}

.lesson-content-main .lesson-header {
    margin-bottom: 1.5rem;
}

.lesson-content-main .lesson-title {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.lesson-content-main .lesson-content p {
    margin-bottom: 1rem;
    color: var(--muted-foreground);
}

.lesson-content-main .key-concepts,
.lesson-content-main .learning-objectives,
.lesson-content-main .tips,
.lesson-content-main .pitfalls,
.lesson-content-main .summary,
.lesson-content-main .exercise {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.lesson-content-main .exercise h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--foreground);
}

.lesson-content-main .exercise-description {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--muted-foreground);
    margin-bottom: 1.5rem;
}

.lesson-content-main .code-block {
    background: #1e293b !important;
    border-radius: var(--radius);
    padding: 1.5rem !important;
    margin: 1.5rem 0 !important;
    overflow-x: auto;
    border: 1px solid var(--border);
    position: relative;
}

.lesson-content-main .code-block pre {
    margin: 0 !important;
    padding: 0 !important;
    color: #e2e8f0 !important;
    font-family: 'JetBrains Mono', 'Courier New', Courier, monospace !important;
    font-size: 0.875rem !important;
    line-height: 1.6 !important;
    background: transparent !important;
    white-space: pre !important;
    overflow-x: auto;
}

.lesson-content-main .code-block code {
    color: #e2e8f0 !important;
    white-space: pre !important;
    font-family: 'JetBrains Mono', 'Courier New', Courier, monospace !important;
    font-size: 0.875rem !important;
    display: block;
    padding: 0;
    margin: 0;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    color: var(--muted-foreground);
}

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

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

.lesson-navigation-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    gap: 1rem;
}

.lesson-content-wrapper {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: calc(var(--radius) * 2);
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2), 0 2px 8px rgba(0, 0, 0, 0.1);
}

.lesson-navigation-bottom {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 2rem;
}

.lesson-nav-link {
    padding: 1.75rem;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--foreground);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.lesson-nav-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.lesson-nav-link:hover {
    border-color: rgba(236, 72, 153, 0.4);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(236, 72, 153, 0.2), 0 4px 12px rgba(139, 92, 246, 0.15);
    background: rgba(255, 255, 255, 0.05);
}

.lesson-nav-link:hover::before {
    opacity: 1;
}

.lesson-nav-link.prev {
    text-align: left;
}

.lesson-nav-link.next {
    text-align: right;
}

.nav-label {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    margin-bottom: 0.5rem;
}

.nav-title {
    font-weight: 600;
    color: var(--foreground);
}

/* Editor Side Styles */
.editor-container-vertical {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.editor-panel-top {
    flex: 0 0 60%;
    display: flex;
    flex-direction: column;
    border-bottom: 1px solid var(--border);
}

.editor-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.editor-header-bar h3 {
    margin: 0;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--foreground);
}

.code-editor-textarea {
    flex: 1;
    width: 100%;
    padding: 1rem;
    border: none;
    font-family: 'JetBrains Mono', 'Courier New', Courier, monospace;
    font-size: 0.875rem;
    background: var(--card);
    color: var(--foreground);
    resize: none;
    outline: none;
}

.output-panel-bottom {
    flex: 0 0 40%;
    display: flex;
    flex-direction: column;
}

.output-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.output-header-bar h3 {
    margin: 0;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--foreground);
}

.output-content-area {
    flex: 1;
    padding: 1.25rem;
    overflow-y: auto;
    font-family: 'JetBrains Mono', 'Courier New', Courier, monospace;
    font-size: 0.875rem;
    white-space: pre-wrap;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: #e2e8f0;
    line-height: 1.7;
}

.output-content-area.success {
    color: var(--success-color);
}

.output-content-area.error {
    color: var(--error-color);
}

.no-exercise-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    padding: 2rem;
    text-align: center;
    color: var(--muted-foreground);
}

.no-exercise-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.no-exercise-message h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--foreground);
}

.no-exercise-message p {
    margin-bottom: 2rem;
    max-width: 400px;
}

/* Responsive */
@media (max-width: 768px) {
    .lesson-layout {
        flex-direction: column;
    }
    
    .lesson-content-side,
    .lesson-editor-side {
        width: 100%;
    }
    
    .lesson-content-side {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    
    .editor-container-vertical {
        height: 50vh;
    }
    
    .course-container {
        padding: 1rem;
    }
    
    .course-title {
        font-size: 2rem;
    }
    
    .course-header-content {
        flex-direction: column;
    }
    
    .lesson {
        padding: 1.5rem;
    }
    
    .lesson-title {
        font-size: 1.5rem;
    }
    
    .code-block {
        padding: 1rem;
    }
    
    .code-block pre {
        font-size: 0.75rem;
    }
    
    .lesson-navigation-bottom {
        grid-template-columns: 1fr;
    }
    
    .lesson-nav-link.next {
        text-align: left;
    }
}