* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header - Unified for all pages */
.header {
    background: #2563eb;
    color: white;
    padding: 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    height: 70px;
}

.logo, .nav-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu li a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-menu li a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Main content spacing */
body {
    padding-top: 70px;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: #2563eb;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 150px 0 100px;
    text-align: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
}

.btn-primary {
    background: #fff;
    color: #2563eb;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.btn-secondary:hover {
    background: #fff;
    color: #2563eb;
}

/* Overview Section */
.overview {
    padding: 80px 0;
    background: #f8fafc;
}

.overview h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2d3748;
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.overview-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.overview-card:hover {
    transform: translateY(-5px);
}

.overview-card h3 {
    color: #2563eb;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.overview-card p {
    font-size: 1.1rem;
    color: #666;
}

/* Video Section */
.video-section {
    padding: 80px 0;
    background: white;
}

.video-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2d3748;
}

.video-container {
    max-width: 900px;
    margin: 0 auto 2rem;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.video-container iframe {
    border-radius: 15px;
}

.video-description {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.video-description h3 {
    color: #2563eb;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.video-description p {
    font-size: 1.1rem;
    color: #666;
    line-height: 1.8;
}

/* Topics Section */
.topics {
    padding: 80px 0;
    background: #f8fafc;
}

.topics h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2d3748;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.topic-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.topic-card:hover {
    transform: translateY(-5px);
}

.topic-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.topic-card h3 {
    color: #2563eb;
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.topic-card p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.topic-card ul {
    list-style: none;
}

.topic-card li {
    color: #555;
    margin-bottom: 0.5rem;
    padding-left: 1rem;
    position: relative;
}

.topic-card li:before {
    content: "✓";
    color: #10b981;
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* Resources Section */
.resources {
    padding: 80px 0;
    background: white;
}

.resources h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2d3748;
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.resource-card {
    background: #f8fafc;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    border: 2px solid transparent;
    transition: all 0.3s;
}

.resource-card:hover {
    border-color: #2563eb;
    transform: translateY(-5px);
}

.resource-card h3 {
    color: #2563eb;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.resource-card p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.resource-link {
    display: inline-block;
    background: #2563eb;
    color: white;
    padding: 10px 25px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.3s;
}

.resource-link:hover {
    background: #1d4ed8;
}

/* Footer */
.footer {
    background: #2d3748;
    color: white;
    text-align: center;
    padding: 2rem 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .overview-grid,
    .topics-grid,
    .resources-grid {
        grid-template-columns: 1fr;
    }
    
    .video-container iframe {
        height: 250px;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Feature Selection Lecture Specific Styles */
.code-block {
    background: #f4f4f4;
    border-left: 4px solid #2563eb;
    padding: 15px;
    margin: 15px 0;
    font-family: 'Courier New', monospace;
    overflow-x: auto;
    border-radius: 4px;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.comparison-table th, .comparison-table td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}

.comparison-table th {
    background-color: #2563eb;
    color: white;
}

.method-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 20px 0;
}

.performance-box {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 20px;
    margin: 15px 0;
}

.method-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.method-card {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.content-box {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.lecture-nav {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
}

.lecture-nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.lecture-nav a {
    color: #2563eb;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.lecture-nav a:hover {
    background-color: #e5e7eb;
}
/* Main Content Layout - Centered */
.main-content {
    margin-top: 70px;
    padding: 40px 0;
    background: #f8fafc;
    min-height: calc(100vh - 70px);
}

.main-content .container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Hero Section for Lectures */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 40px;
    text-align: center;
    border-radius: 15px;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.hero-section h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin: 0;
}

/* Content Sections */
.content-section {
    margin-bottom: 40px;
}

.content-section h2 {
    font-size: 2.2rem;
    color: #2d3748;
    margin-bottom: 20px;
    text-align: center;
    border-bottom: 3px solid #2563eb;
    padding-bottom: 10px;
}

.content-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    margin-bottom: 20px;
}

.content-card h3 {
    color: #2563eb;
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.content-card p {
    margin-bottom: 15px;
    line-height: 1.7;
    color: #4a5568;
}

.content-card ul, .content-card ol {
    margin-left: 20px;
    margin-bottom: 15px;
}

.content-card li {
    margin-bottom: 8px;
    line-height: 1.6;
    color: #4a5568;
}

/* Algorithm Steps */
.algorithm-steps ol {
    counter-reset: step-counter;
    list-style: none;
    margin-left: 0;
}

.algorithm-steps li {
    counter-increment: step-counter;
    margin-bottom: 15px;
    padding-left: 40px;
    position: relative;
}

.algorithm-steps li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    background: #2563eb;
    color: white;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
}

/* Comparison Table */
.comparison-table {
    overflow-x: auto;
    margin: 20px 0;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
}

.comparison-table th {
    background: #2563eb;
    color: white;
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

.comparison-table td {
    padding: 12px 15px;
    border-bottom: 1px solid #e2e8f0;
}

.comparison-table tr:nth-child(even) {
    background: #f7fafc;
}

/* Code Examples */
.code-example {
    margin: 20px 0;
}

.code-example h4 {
    color: #2563eb;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.code-example pre {
    background: #1a202c;
    color: #e2e8f0;
    padding: 20px;
    border-radius: 10px;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Use Cases */
.use-cases {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 20px 0;
}

.use-case {
    background: #f7fafc;
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid #2563eb;
}

.use-case h3 {
    color: #2563eb;
    margin-bottom: 15px;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.benefit {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.benefit h3 {
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.benefit p {
    margin: 0;
    opacity: 0.9;
    line-height: 1.5;
}

/* Parameters */
.parameters {
    display: grid;
    gap: 15px;
    margin: 20px 0;
}

.parameter {
    background: #f7fafc;
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid #2563eb;
}

.parameter h4 {
    color: #2563eb;
    margin-bottom: 8px;
    font-family: 'Courier New', monospace;
}

.parameter p {
    margin-bottom: 8px;
    color: #4a5568;
}

.param-default {
    background: #e2e8f0;
    padding: 4px 8px;
    border-radius: 5px;
    font-size: 0.85rem;
    color: #2d3748;
    font-family: 'Courier New', monospace;
}

/* Resources Section */
.resources-section {
    margin-top: 50px;
    padding-top: 40px;
    border-top: 2px solid #e2e8f0;
}

.resources-section h2 {
    text-align: center;
    color: #2d3748;
    margin-bottom: 30px;
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.resource-card {
    background: white;
    padding: 25px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s;
}

.resource-card:hover {
    transform: translateY(-5px);
}

.resource-card h3 {
    color: #2563eb;
    margin-bottom: 15px;
}

.download-btn {
    background: #2563eb;
    color: white;
    padding: 10px 20px;
    border-radius: 25px;
    text-decoration: none;
    display: inline-block;
    margin-top: 15px;
    transition: all 0.3s;
}

.download-btn:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background: #2d3748;
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-top: 50px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .use-cases {
        grid-template-columns: 1fr;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .main-content .container {
        padding: 0 15px;
    }
    
    .content-card {
        padding: 20px;
    }
}
/* Visual Elements Styles */

/* Visual Analogy */
.visual-analogy {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: 25px;
    border-radius: 15px;
    margin: 20px 0;
    border: 2px solid #0ea5e9;
}

.analogy-container {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin: 20px 0;
}

.analogy-item {
    text-align: center;
    background: white;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    min-width: 100px;
}

.expert-icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.plus {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2563eb;
}

.arrow {
    font-size: 1.5rem;
    color: #2563eb;
    font-weight: bold;
}

.result {
    background: #2563eb;
    color: white;
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    min-width: 120px;
}

.result-icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.analogy-text {
    text-align: center;
    font-style: italic;
    color: #1e40af;
    margin-top: 15px;
    font-weight: 500;
}

/* Workflow Diagram */
.workflow-diagram {
    background: #f8fafc;
    padding: 25px;
    border-radius: 15px;
    margin: 20px 0;
}

.workflow-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.workflow-step {
    background: white;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    min-width: 250px;
}

.step-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.workflow-step h4 {
    color: #2563eb;
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.arrow-down {
    font-size: 2rem;
    color: #2563eb;
    font-weight: bold;
}

.dataset-visual, .bootstrap-visual {
    margin: 10px 0;
}

.data-row {
    font-size: 1.2rem;
    margin: 5px 0;
    letter-spacing: 3px;
}

.sample {
    background: #e0f2fe;
    padding: 8px;
    margin: 5px 0;
    border-radius: 5px;
    font-size: 1.1rem;
    letter-spacing: 2px;
}

.trees-visual {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.tree {
    background: #22c55e;
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: bold;
}

.voting-visual {
    text-align: left;
}

.vote {
    background: #f1f5f9;
    padding: 8px;
    margin: 5px 0;
    border-radius: 5px;
    border-left: 3px solid #2563eb;
}

.vote-result {
    background: #2563eb;
    color: white;
    padding: 10px;
    border-radius: 8px;
    font-weight: bold;
    margin-top: 10px;
}

/* Visual Comparison */
.visual-comparison {
    background: #f8fafc;
    padding: 25px;
    border-radius: 15px;
    margin: 20px 0;
}

.comparison-visual {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 20px;
    align-items: center;
    margin: 20px 0;
}

.single-tree-side, .forest-side {
    background: white;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.vs-divider {
    background: #2563eb;
    color: white;
    padding: 15px 20px;
    border-radius: 50%;
    font-weight: bold;
    font-size: 1.2rem;
}

.tree-diagram {
    margin: 15px 0;
}

.tree-node {
    background: #2563eb;
    color: white;
    padding: 8px 15px;
    border-radius: 8px;
    margin: 5px;
    display: inline-block;
    font-size: 0.9rem;
}

.tree-branches {
    margin: 10px 0;
}

.tree-leaves {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 10px;
}

.leaf {
    font-size: 1.5rem;
    padding: 5px;
    background: #f1f5f9;
    border-radius: 50%;
}

.forest-diagram {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 15px 0;
    font-size: 1.5rem;
}

.forest-prediction {
    margin: 15px 0;
}

.individual-votes {
    font-size: 1.3rem;
    letter-spacing: 5px;
    margin-bottom: 10px;
}

.final-vote {
    background: #22c55e;
    color: white;
    padding: 8px;
    border-radius: 8px;
    font-weight: bold;
}

.risk-indicator {
    padding: 8px 15px;
    border-radius: 20px;
    font-weight: bold;
    margin-top: 15px;
}

.risk-indicator.high {
    background: #fef2f2;
    color: #dc2626;
    border: 2px solid #fca5a5;
}

.risk-indicator.low {
    background: #f0fdf4;
    color: #16a34a;
    border: 2px solid #86efac;
}

/* Feature Importance Visual */
.feature-importance-visual {
    background: #f8fafc;
    padding: 25px;
    border-radius: 15px;
    margin: 20px 0;
}

.importance-chart {
    margin: 20px 0;
}

.feature-bar {
    display: flex;
    align-items: center;
    margin: 12px 0;
    gap: 15px;
}

.feature-name {
    min-width: 80px;
    font-weight: 600;
    color: #374151;
}

.bar-container {
    flex: 1;
    background: #e5e7eb;
    border-radius: 10px;
    height: 25px;
    position: relative;
    overflow: hidden;
}

.importance-bar {
    background: linear-gradient(90deg, #2563eb 0%, #3b82f6 100%);
    height: 100%;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 10px;
    color: white;
    font-weight: bold;
    font-size: 0.85rem;
    transition: width 0.8s ease-in-out;
}

.chart-explanation {
    text-align: center;
    font-style: italic;
    color: #1e40af;
    margin-top: 15px;
    font-weight: 500;
}

/* Responsive Design for Visuals */
@media (max-width: 768px) {
    .analogy-container {
        flex-direction: column;
    }
    
    .comparison-visual {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .vs-divider {
        justify-self: center;
    }
    
    .workflow-step {
        min-width: auto;
        width: 100%;
    }
    
    .feature-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .bar-container {
        width: 100%;
    }
}
/* Interactive Notebook Styles */
.interactive-code {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: 25px;
    border-radius: 15px;
    text-align: center;
    margin: 20px 0;
    border: 2px solid #0ea5e9;
}

.notebook-btn {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: 25px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
    margin: 15px 0;
}

.notebook-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.4);
    background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
}

.notebook-info {
    font-style: italic;
    color: #1e40af;
    margin-top: 10px;
    font-size: 0.9rem;
}

.code-preview {
    background: #f8fafc;
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
}

.code-preview h4 {
    color: #374151;
    margin-bottom: 10px;
}

.code-preview pre {
    background: #1f2937;
    color: #e5e7eb;
    padding: 15px;
    border-radius: 8px;
    font-size: 0.85rem;
    overflow-x: auto;
}

/* Interactive Resources */
.interactive-resources {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.practice-card {
    background: white;
    padding: 25px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: all 0.3s;
    border: 2px solid transparent;
}

.practice-card:hover {
    transform: translateY(-5px);
    border-color: #2563eb;
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.15);
}

.practice-card h3 {
    color: #2563eb;
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.practice-card p {
    color: #6b7280;
    margin-bottom: 20px;
    line-height: 1.5;
}

.practice-btn {
    background: #22c55e;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 20px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.95rem;
}

.practice-btn:hover {
    background: #16a34a;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(34, 197, 94, 0.3);
}

.teacher-note {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    padding: 25px;
    border-radius: 15px;
    margin-top: 30px;
    border-left: 5px solid #f59e0b;
}

.teacher-note h3 {
    color: #92400e;
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.teacher-note p {
    color: #78350f;
    margin: 0;
    line-height: 1.6;
}

/* Responsive Design for Interactive Elements */
@media (max-width: 768px) {
    .interactive-resources {
        grid-template-columns: 1fr;
    }
    
    .notebook-btn {
        padding: 12px 20px;
        font-size: 1rem;
    }
    
    .practice-card {
        padding: 20px;
    }
}