/* Tutorial Specific Styles */

/* Tutorial Layout Fixes */
body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.tutorial-header,
.tutorial-content {
    width: 100%;
    clear: both;
}

.modern-footer {
    margin-top: auto;
    width: 100%;
    clear: both;
}

/* Tutorial Header */
.tutorial-header {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
    color: white;
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.tutorial-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="a" cx="50%" cy="50%"><stop offset="0%" stop-color="%236366f1" stop-opacity="0.1"/><stop offset="100%" stop-color="%236366f1" stop-opacity="0"/></radialGradient></defs><circle cx="200" cy="200" r="100" fill="url(%23a)"/><circle cx="800" cy="300" r="150" fill="url(%23a)"/><circle cx="400" cy="700" r="120" fill="url(%23a)"/></svg>');
    opacity: 0.5;
}

.tutorial-breadcrumb {
    margin-bottom: 2rem;
    position: relative;
    z-index: 2;
}

.tutorial-breadcrumb a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
}

.tutorial-breadcrumb a:hover {
    color: var(--primary-color);
}

.tutorial-meta {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    position: relative;
    z-index: 2;
}

.tutorial-category {
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
}

.tutorial-difficulty {
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
}

.tutorial-difficulty.advanced {
    background: rgba(245, 158, 11, 0.1);
    color: #d97706;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.tutorial-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 2;
}

.tutorial-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin: 0 auto 2rem;
    line-height: 1.6;
    position: relative;
    z-index: 2;
}

.tutorial-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    position: relative;
    z-index: 2;
}

.stat-item {
    display: flex;
    align-items: center;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

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

/* Tutorial Content */
.tutorial-content {
    background: white;
    padding: 4rem 0;
}

.tutorial-content .content-section {
    background: transparent;
    padding: 2rem 0;
    border-bottom: 1px solid #e5e7eb;
}

.tutorial-content .content-section:last-child {
    border-bottom: none;
}
.tutorial-content {
    background: var(--bg-secondary);
    padding: 5rem 0;
}

.content-wrapper {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.content-section {
    margin-bottom: 3rem;
}

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

.section-heading {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
}

.section-heading i {
    color: var(--primary-color);
}

.lead {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 2rem;
}

/* Matrix Styling */
.matrix-example {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
    border: 1px solid var(--border-color);
}

.matrix-example h5 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 1rem;
}

.matrix-container {
    overflow-x: auto;
    margin-bottom: 1rem;
}

.matrix-table {
    width: 100%;
    border-collapse: collapse;
    margin: 0 auto;
    max-width: 500px;
}

.matrix-table th,
.matrix-table td {
    padding: 0.75rem;
    text-align: center;
    border: 1px solid var(--border-color);
    font-weight: 500;
}

.matrix-table th {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.matrix-table .row-header {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-weight: 600;
}

.matrix-table td {
    background: var(--bg-card);
    color: var(--text-primary);
}

.matrix-table td.highlight {
    background: rgba(245, 158, 11, 0.2);
    color: #d97706;
    font-weight: 600;
}

.matrix-caption {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-align: center;
    margin: 0;
}

/* Approach Sections */
.approach-section {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
    border: 1px solid var(--border-color);
}

.approach-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

.approach-title.naive {
    color: #dc2626;
}

.approach-title.naive i {
    color: #dc2626;
}

.approach-title.efficient {
    color: #059669;
}

.approach-title.efficient i {
    color: #059669;
}

/* Code Blocks */
.code-block {
    background: #1e293b;
    border-radius: 12px;
    overflow: hidden;
    margin: 1.5rem 0;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.code-header {
    background: #334155;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.code-title {
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
}

.complexity {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
}

.code-block pre {
    margin: 0;
    padding: 1.5rem;
    background: transparent;
    border: none;
}

.code-block code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

/* Formula Box */
.formula-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.formula-box h5 {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.formula-box code {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
    display: block;
    text-align: center;
    font-size: 0.875rem;
}

/* Visual Explanation */
.visual-explanation {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
    border: 1px solid var(--border-color);
}

.visual-explanation h5 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.explanation-steps {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.step {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.step-number {
    width: 30px;
    height: 30px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.step-text {
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Alerts */
.alert {
    border-radius: 12px;
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    border: none;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    color: #d97706;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.alert i {
    margin-top: 0.125rem;
    flex-shrink: 0;
}

/* Complexity Table */
.complexity-table {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 2rem 0;
    border: 1px solid var(--border-color);
}

.complexity-table .table {
    margin: 0;
}

.complexity-table th {
    background: var(--primary-color);
    color: white;
    border: none;
    font-weight: 600;
    padding: 1rem;
}

.complexity-table td {
    padding: 1rem;
    border: 1px solid var(--border-color);
    vertical-align: middle;
}

.complexity-excellent {
    background: rgba(34, 197, 94, 0.1);
    color: #16a34a;
    font-weight: 600;
}

.complexity-good {
    background: rgba(59, 130, 246, 0.1);
    color: #2563eb;
    font-weight: 600;
}

/* Takeaways */
.takeaways-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.takeaway-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.takeaway-item i {
    color: #16a34a;
    font-size: 1.25rem;
    margin-top: 0.25rem;
    flex-shrink: 0;
}

.takeaway-item h5 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.takeaway-item p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.5;
}

/* Tutorial Navigation */
.tutorial-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.nav-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.nav-btn.prev {
    background: rgba(107, 114, 128, 0.1);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.nav-btn.prev:hover {
    background: var(--gradient-primary);
    color: white;
}

/* Inline Code */
code {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875em;
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 768px) {
    .tutorial-header {
        padding: 100px 0 60px;
    }
    
    .tutorial-meta {
        flex-direction: column;
        align-items: center;
    }
    
    .tutorial-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .content-wrapper {
        padding: 2rem 1.5rem;
    }
    
    .section-heading {
        font-size: 1.5rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .code-header {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }
    
    .tutorial-navigation {
        flex-direction: column;
        gap: 1rem;
    }
    
    .takeaways-grid {
        grid-template-columns: 1fr;
    }
    
    .explanation-steps {
        gap: 1.5rem;
    }
    
    .step {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }
}

@media (max-width: 576px) {
    .matrix-table th,
    .matrix-table td {
        padding: 0.5rem;
        font-size: 0.875rem;
    }
    
    .approach-section,
    .matrix-example,
    .visual-explanation {
        padding: 1.5rem;
    }
    
    .formula-box code {
        font-size: 0.75rem;
        padding: 0.75rem;
    }
}
/* Additional Tutorial Styles for Subtree Tutorial */

/* Prerequisites Box */
.prerequisites-box {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1) 0%, rgba(16, 185, 129, 0.1) 100%);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 2rem 0;
}

.prerequisites-box h4 {
    color: #16a34a;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

.prerequisites-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.prerequisites-list li {
    display: flex;
    align-items: center;
    color: #16a34a;
    font-weight: 500;
}

/* Definition Box */
.definition-box {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(99, 102, 241, 0.1) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 2rem 0;
}

.definition-box h5 {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

/* Tree Examples */
.tree-example {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
    border: 1px solid var(--border-color);
    text-align: center;
}

.tree-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

.tree-caption {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-style: italic;
    margin: 0;
}

/* Table Highlights */
.highlight-header {
    background: rgba(245, 158, 11, 0.8) !important;
    color: white !important;
}

.highlight-cell {
    background: rgba(245, 158, 11, 0.2) !important;
    color: #d97706 !important;
    font-weight: 600;
}

/* Expert Difficulty Badge */
.tutorial-difficulty.expert {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Success Alert */
.alert-success {
    background: rgba(34, 197, 94, 0.1);
    color: #16a34a;
    border: 1px solid rgba(34, 197, 94, 0.2);
}

/* Formula List */
.formula-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.formula-item {
    background: rgba(99, 102, 241, 0.05);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
}

/* Applications Grid */
.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.application-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.application-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.application-item i {
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-top: 0.25rem;
    flex-shrink: 0;
}

.application-item h5 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.application-item p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.5;
}

/* Conclusion Box */
.conclusion-box {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1) 0%, rgba(16, 185, 129, 0.1) 100%);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
    text-align: center;
}

.conclusion-box h4 {
    color: #16a34a;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.publication-date {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-top: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-style: italic;
}

.publication-date i {
    color: var(--primary-color);
}