/* ============================================
   BIOLOGY ROADMAP - COMPLETE STYLESHEET
   ============================================ */

/* CSS Variables */
:root {
    /* Primary Colors - Biology/Nature Theme */
    --color-primary: #0d4f3c;
    --color-primary-light: #1a7a5e;
    --color-primary-dark: #083328;
    
    /* Secondary Colors */
    --color-secondary: #2d8659;
    --color-accent: #4ecdc4;
    --color-accent-light: #7ee8e1;
    
    /* Stage Colors */
    --stage1-color: #2E8B57;
    --stage2-color: #20B2AA;
    --stage3-color: #3CB371;
    --stage4-color: #008B8B;
    --stage5-color: #2F4F4F;
    --stage6-color: #006666;
    
    /* Background Colors */
    --bg-dark: #0a1f1a;
    --bg-medium: #0f2f26;
    --bg-light: #143d32;
    --bg-card: #1a4a3d;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #b8d4cd;
    --text-muted: #7aa99d;
    
    /* Gradients */
    --gradient-hero: linear-gradient(135deg, #0d4f3c 0%, #1a7a5e 50%, #2d8659 100%);
    --gradient-card: linear-gradient(145deg, #1a4a3d 0%, #0f2f26 100%);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    
    /* Shadows */
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset & Base Styles */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}

p, li, span {
    font-weight: 600;
    color: var(--text-secondary);
}

strong {
    font-weight: 700;
    color: var(--text-primary);
}

/* Print Button */
.print-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    background: var(--gradient-hero);
    color: var(--text-primary);
    border: 2px solid var(--color-accent);
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-family: 'Source Sans Pro', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-medium);
}

.print-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    background: var(--color-accent);
    color: var(--bg-dark);
}

.print-icon {
    font-size: 1.2rem;
}

/* Sidebar Navigation */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background: var(--bg-medium);
    border-right: 3px solid var(--color-accent);
    z-index: 900;
    overflow-y: auto;
    transition: var(--transition-medium);
    box-shadow: var(--shadow-lg);
}

.sidebar.closed {
    transform: translateX(-100%);
}

.sidebar-header {
    padding: var(--spacing-md);
    background: var(--gradient-hero);
    border-bottom: 2px solid var(--color-accent);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 700;
}

.sidebar-toggle {
    background: transparent;
    border: 2px solid var(--text-primary);
    color: var(--text-primary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 700;
    transition: var(--transition-fast);
}

.sidebar-toggle:hover {
    background: var(--text-primary);
    color: var(--bg-dark);
}

.nav-list {
    list-style: none;
    padding: var(--spacing-sm);
}

.nav-list li {
    margin-bottom: 8px;
}

.nav-link {
    display: block;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background: var(--bg-light);
    color: var(--color-accent);
    border-left-color: var(--color-accent);
    transform: translateX(5px);
}

.nav-link.active {
    background: var(--bg-light);
    color: var(--color-accent);
    border-left-color: var(--color-accent);
}

/* Sidebar Open Button */
.sidebar-open-btn {
    position: fixed;
    left: 20px;
    top: 20px;
    z-index: 850;
    background: var(--gradient-hero);
    color: var(--text-primary);
    border: 2px solid var(--color-accent);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 700;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: var(--transition-medium);
    display: none;
}

.sidebar-open-btn.visible {
    display: block;
}

.sidebar-open-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Main Content */
.main-content {
    margin-left: 280px;
    min-height: 100vh;
    transition: var(--transition-medium);
}

.main-content.expanded {
    margin-left: 0;
}

/* Hero Section */
.hero {
    background: var(--gradient-hero);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 350px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%234ecdc4' fill-opacity='0.08'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.dna-helix {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: var(--color-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    animation: pulse 2s ease-in-out infinite;
    box-shadow: 0 0 30px var(--color-accent);
}

.dna-helix::before {
    content: '🧬';
}

@keyframes pulse {
    0%, 100% { transform: scale(1); box-shadow: 0 0 30px var(--color-accent); }
    50% { transform: scale(1.1); box-shadow: 0 0 50px var(--color-accent); }
}

.hero-title {
    font-size: 3rem;
    font-weight: 900;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 1px;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--color-accent-light);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.hero-badges {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.badge {
    background: rgba(78, 205, 196, 0.2);
    border: 2px solid var(--color-accent);
    color: var(--text-primary);
    padding: 8px 20px;
    border-radius: var(--radius-xl);
    font-weight: 700;
    font-size: 0.95rem;
}

/* Disclaimer */
.disclaimer {
    background: linear-gradient(135deg, #8B4513 0%, #A0522D 100%);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 5px solid #FFD700;
    font-weight: 700;
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

/* Stage Sections */
.stage {
    padding: var(--spacing-xl) var(--spacing-lg);
    border-bottom: 3px solid var(--bg-light);
}

.stage:nth-child(odd) {
    background: var(--bg-dark);
}

.stage:nth-child(even) {
    background: var(--bg-medium);
}

.stage-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px dashed var(--color-accent);
}

.stage-number {
    display: inline-block;
    font-family: 'Playfair Display', serif;
    font-size: 4rem;
    font-weight: 900;
    color: var(--color-accent);
    opacity: 0.3;
    line-height: 1;
}

.stage-title {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: var(--spacing-xs) 0;
}

.stage-desc {
    font-size: 1.1rem;
    color: var(--color-accent);
    font-weight: 700;
}

/* Topic Cards */
.stage-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.topic-card {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 2px solid var(--bg-light);
    box-shadow: var(--shadow-md);
    transition: var(--transition-medium);
}

.topic-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(78, 205, 196, 0.2);
}

.topic-title {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--bg-light);
}

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

.topic-list li {
    padding: 10px 0;
    padding-left: 25px;
    position: relative;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(78, 205, 196, 0.1);
    transition: var(--transition-fast);
}

.topic-list li:last-child {
    border-bottom: none;
}

.topic-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 700;
    font-size: 1.1rem;
}

.topic-list li:hover {
    color: var(--text-primary);
    padding-left: 30px;
}

.topic-list li:hover::before {
    color: var(--color-accent-light);
}

/* Visualization Sections */
.visualization-section {
    padding: var(--spacing-xl) var(--spacing-lg);
    background: var(--bg-medium);
    border-top: 3px solid var(--color-accent);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.section-desc {
    font-size: 1.1rem;
    color: var(--color-accent);
    text-align: center;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
}

/* Flowchart Styles */
.flowchart-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    background: var(--bg-dark);
    border-radius: var(--radius-lg);
    border: 2px solid var(--bg-light);
}

.flowchart {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.flow-row {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.branch-row {
    width: 100%;
    max-width: 800px;
}

.flow-box {
    background: var(--gradient-card);
    border: 3px solid var(--color-accent);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    min-width: 200px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition-medium);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.flow-box:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg), 0 0 25px rgba(78, 205, 196, 0.3);
}

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

.flow-text {
    font-family: 'Playfair Display', serif;
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-primary);
}

.flow-sub {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
}

.start-box {
    background: linear-gradient(135deg, #228B22 0%, #32CD32 100%);
    border-color: #90EE90;
}

.end-box {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    border-color: #FFFF00;
}

.end-box .flow-text {
    color: var(--bg-dark);
}

/* Flow Arrows */
.flow-arrow {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.arrow-down {
    width: 4px;
    height: 40px;
    background: var(--color-accent);
    position: relative;
}

.arrow-down::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 12px solid transparent;
    border-right: 12px solid transparent;
    border-top: 15px solid var(--color-accent);
}

.arrow-converge {
    width: 100%;
    max-width: 600px;
    height: 50px;
    position: relative;
}

.arrow-converge::before {
    content: '';
    position: absolute;
    top: 0;
    left: 10%;
    right: 10%;
    height: 3px;
    background: var(--color-accent);
}

.arrow-converge::after {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 50px;
    background: var(--color-accent);
}

/* Mind Map Styles */
.mindmap-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    background: var(--bg-dark);
    border-radius: var(--radius-lg);
    border: 2px solid var(--bg-light);
    min-height: 600px;
    position: relative;
    overflow: hidden;
}

.mindmap {
    position: relative;
    width: 100%;
    height: 550px;
}

.mind-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 140px;
    height: 140px;
    background: var(--gradient-hero);
    border: 4px solid var(--color-accent);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
    box-shadow: 0 0 40px rgba(78, 205, 196, 0.5);
}

.mind-icon {
    font-size: 2.5rem;
}

.mind-text {
    font-family: 'Playfair Display', serif;
    font-size: 1rem;
    font-weight: 800;
    color: var(--text-primary);
}

.mind-branch {
    position: absolute;
}

.mind-node {
    padding: 10px 18px;
    border-radius: var(--radius-md);
    font-weight: 700;
    text-align: center;
    transition: var(--transition-medium);
    white-space: nowrap;
}

.node-primary {
    background: var(--color-primary);
    border: 3px solid var(--color-accent);
    color: var(--text-primary);
    font-size: 1rem;
    box-shadow: var(--shadow-md);
}

.node-primary:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.node-secondary {
    background: var(--bg-card);
    border: 2px solid var(--color-secondary);
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin: 8px 0;
}

.node-secondary:hover {
    background: var(--color-secondary);
    color: var(--text-primary);
}

.mind-connector {
    position: absolute;
    background: var(--color-accent);
    opacity: 0.6;
}

.mind-children {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

/* Branch Positions */
.branch-1 {
    top: 8%;
    left: 50%;
    transform: translateX(-50%);
}

.branch-1 .mind-connector {
    width: 3px;
    height: 80px;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
}

.branch-1 .mind-children {
    position: absolute;
    top: -120px;
    left: 50%;
    transform: translateX(-50%);
    flex-direction: row;
    gap: 10px;
}

.branch-2 {
    top: 25%;
    right: 5%;
}

.branch-2 .mind-connector {
    width: 100px;
    height: 3px;
    top: 50%;
    right: 100%;
    transform: translateY(-50%);
}

.branch-2 .mind-children {
    position: absolute;
    top: 50%;
    left: 110%;
    transform: translateY(-50%);
}

.branch-3 {
    bottom: 25%;
    right: 5%;
}

.branch-3 .mind-connector {
    width: 100px;
    height: 3px;
    top: 50%;
    right: 100%;
    transform: translateY(-50%);
}

.branch-3 .mind-children {
    position: absolute;
    top: 50%;
    left: 110%;
    transform: translateY(-50%);
}

.branch-4 {
    bottom: 8%;
    left: 50%;
    transform: translateX(-50%);
}

.branch-4 .mind-connector {
    width: 3px;
    height: 80px;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
}

.branch-4 .mind-children {
    position: absolute;
    bottom: -120px;
    left: 50%;
    transform: translateX(-50%);
    flex-direction: row;
    gap: 10px;
}

.branch-5 {
    top: 25%;
    left: 5%;
}

.branch-5 .mind-connector {
    width: 100px;
    height: 3px;
    top: 50%;
    left: 100%;
    transform: translateY(-50%);
}

.branch-5 .mind-children {
    position: absolute;
    top: 50%;
    right: 110%;
    transform: translateY(-50%);
}

.branch-6 {
    bottom: 25%;
    left: 5%;
}

.branch-6 .mind-connector {
    width: 100px;
    height: 3px;
    top: 50%;
    left: 100%;
    transform: translateY(-50%);
}

.branch-6 .mind-children {
    position: absolute;
    top: 50%;
    right: 110%;
    transform: translateY(-50%);
}

/* Visual Roadmap Styles */
.roadmap-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.roadmap-timeline {
    position: relative;
    padding-left: 80px;
}

.roadmap-timeline::before {
    content: '';
    position: absolute;
    left: 35px;
    top: 0;
    bottom: 0;
    width: 6px;
    background: linear-gradient(180deg, 
        var(--stage1-color) 0%, 
        var(--stage2-color) 20%, 
        var(--stage3-color) 40%, 
        var(--stage4-color) 60%, 
        var(--stage5-color) 80%, 
        var(--stage6-color) 100%
    );
    border-radius: 3px;
}

.milestone {
    position: relative;
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.milestone-marker {
    position: absolute;
    left: -45px;
    width: 50px;
    height: 50px;
    background: var(--gradient-hero);
    border: 4px solid var(--color-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 5;
    box-shadow: var(--shadow-md);
}

.marker-number {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--text-primary);
}

.milestone-content {
    background: var(--gradient-card);
    border: 2px solid var(--bg-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    flex: 1;
    box-shadow: var(--shadow-md);
    transition: var(--transition-medium);
}

.milestone-content:hover {
    border-color: var(--color-accent);
    transform: translateX(10px);
}

.milestone-title {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-accent);
    margin-bottom: 5px;
}

.milestone-duration {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    padding: 4px 12px;
    background: var(--bg-light);
    border-radius: var(--radius-sm);
    display: inline-block;
}

.milestone-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.milestone-list li {
    background: var(--bg-light);
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-secondary);
    border: 1px solid var(--color-secondary);
}

.milestone-connector {
    position: absolute;
    left: -20px;
    top: 60px;
    width: 3px;
    height: calc(100% + 20px);
    background: rgba(78, 205, 196, 0.3);
}

.milestone-connector.final {
    height: 40px;
}

.milestone-final {
    margin-bottom: 0;
}

.final-marker {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    border-color: #FFFF00;
    width: 60px;
    height: 60px;
}

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

.final-content {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    border-color: #FFFF00;
}

.final-content .milestone-title {
    color: var(--bg-dark);
}

.milestone-desc {
    color: var(--bg-dark);
    font-weight: 700;
}

/* Footer */
.footer {
    background: var(--bg-dark);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-top: 3px solid var(--color-accent);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-disclaimer {
    background: linear-gradient(135deg, #8B4513 0%, #A0522D 100%);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-weight: 700;
    border-left: 5px solid #FFD700;
}

.footer-info p {
    color: var(--text-muted);
    font-weight: 600;
}

/* Print Styles */
@media print {
    body {
        background: white !important;
        color: black !important;
    }
    
    .sidebar,
    .sidebar-open-btn,
    .print-btn {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0 !important;
    }
    
    .hero {
        background: #2E8B57 !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
    
    .stage,
    .topic-card,
    .visualization-section {
        break-inside: avoid;
        page-break-inside: avoid;
    }
    
    .topic-card {
        border: 2px solid #333 !important;
        background: #f5f5f5 !important;
    }
    
    .topic-title,
    .stage-title,
    .section-title {
        color: #0d4f3c !important;
    }
    
    .topic-list li,
    p,
    span {
        color: #333 !important;
    }
    
    strong {
        color: #000 !important;
    }
    
    .flowchart-container,
    .mindmap-container,
    .roadmap-container {
        border: 2px solid #333 !important;
        background: #f9f9f9 !important;
    }
    
    .flow-box,
    .mind-node,
    .milestone-content {
        border: 2px solid #333 !important;
        background: #e8e8e8 !important;
    }
    
    .disclaimer,
    .footer-disclaimer {
        background: #f0e6d2 !important;
        border-left: 5px solid #8B4513 !important;
        color: #333 !important;
    }
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar-open-btn {
        display: block;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .stage-content {
        grid-template-columns: 1fr;
    }
    
    .mindmap-container {
        min-height: 800px;
    }
    
    .mindmap {
        height: 750px;
    }
    
    .mind-branch {
        position: relative;
        top: auto !important;
        left: auto !important;
        right: auto !important;
        bottom: auto !important;
        transform: none !important;
        margin: var(--spacing-md) 0;
    }
    
    .mind-center {
        position: relative;
        top: auto;
        left: auto;
        transform: none;
        margin: 0 auto var(--spacing-lg);
    }
    
    .mindmap {
        display: flex;
        flex-direction: column;
        align-items: center;
        height: auto;
    }
    
    .mind-connector {
        display: none;
    }
    
    .mind-children {
        position: relative !important;
        top: auto !important;
        left: auto !important;
        right: auto !important;
        bottom: auto !important;
        transform: none !important;
        flex-direction: row !important;
        flex-wrap: wrap;
        justify-content: center;
        margin-top: var(--spacing-sm);
    }
}

@media (max-width: 768px) {
    .print-btn {
        top: auto;
        bottom: 20px;
        right: 20px;
        padding: 10px 16px;
        font-size: 0.9rem;
    }
    
    .hero {
        padding: var(--spacing-lg) var(--spacing-sm);
        min-height: 280px;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .stage {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
    
    .stage-title {
        font-size: 1.6rem;
    }
    
    .topic-card {
        padding: var(--spacing-md);
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .roadmap-timeline {
        padding-left: 60px;
    }
    
    .roadmap-timeline::before {
        left: 25px;
    }
    
    .milestone-marker {
        left: -35px;
        width: 40px;
        height: 40px;
    }
    
    .marker-number {
        font-size: 1.2rem;
    }
    
    .flow-box {
        min-width: 150px;
        padding: var(--spacing-sm);
    }
    
    .branch-row {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .hero-badges {
        flex-direction: column;
        align-items: center;
    }
    
    .badge {
        width: 100%;
        max-width: 200px;
    }
    
    .milestone-list {
        flex-direction: column;
    }
    
    .milestone-list li {
        width: 100%;
        text-align: center;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent);
}

/* Selection Styling */
::selection {
    background: var(--color-accent);
    color: var(--bg-dark);
}

/* Focus Styles for Accessibility */
a:focus,
button:focus {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in-left {
    animation: slideInLeft 0.5s ease forwards;
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-50px); }
    to { opacity: 1; transform: translateX(0); }
}

.scale-in {
    animation: scaleIn 0.3s ease forwards;
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}