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

:root {
    /* Dark Theme Colors - WCAG AA Compliant */
    --color-bg: #0d1117;
    --color-bg-secondary: #161b22;
    --color-bg-tertiary: #1c2128;
    --color-text: #e6edf3;
    --color-text-secondary: #9ca3af;  /* Improved contrast: 5.2:1 */
    --color-text-muted: #848d97;      /* Improved contrast: 4.5:1 */
    --color-border: #30363d;
    --color-border-light: #21262d;
    --color-primary: #60a5fa;         /* Slightly brighter for better contrast */
    --color-primary-hover: #93c5fd;
    --color-primary-bg: rgba(56, 139, 253, 0.15);
    --color-code-bg: #161b22;
    --color-code-border: #30363d;
    --color-success: #4ade80;         /* Brighter green for better contrast */
    --color-success-bg: rgba(46, 160, 67, 0.15);
    --color-warning: #fbbf24;         /* Brighter yellow for better contrast */
    --color-warning-bg: rgba(251, 191, 36, 0.15);
    --color-error: #f87171;           /* Slightly softer but still visible */
    --color-error-bg: rgba(248, 81, 73, 0.15);
    --color-accent: #c084fc;          /* Brighter purple for contrast */
    --color-accent-secondary: #f9a8d4; /* Brighter pink */
    --sidebar-width: 280px;
    --navbar-height: 64px;
    --content-max-width: 900px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--color-text);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 1.75rem;
    margin-top: 2.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-border);
}

h3 {
    font-size: 1.35rem;
    margin-top: 2rem;
}

h4 {
    font-size: 1.1rem;
    margin-top: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

ul, ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

strong {
    font-weight: 600;
    color: var(--color-text);
}

/* Selection */
::selection {
    background-color: var(--color-primary-bg);
    color: var(--color-primary);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

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

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(22, 27, 34, 0.9);
}

.nav-brand a {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-brand a:hover {
    text-decoration: none;
    color: var(--color-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.nav-toggle span {
    display: block;
    height: 2px;
    background-color: var(--color-text);
    border-radius: 1px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* Layout */
.layout {
    display: flex;
    margin-top: var(--navbar-height);
    min-height: calc(100vh - var(--navbar-height));
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--navbar-height));
    background-color: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    overflow-y: auto;
    padding: 1.5rem 0;
}

.sidebar-header {
    padding: 0 1.5rem 1rem;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 1rem;
}

.sidebar-header h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
    margin: 0;
    font-weight: 600;
}

.sidebar-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-nav li {
    margin: 0;
}

.sidebar-nav a {
    display: block;
    padding: 0.625rem 1.5rem;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.sidebar-nav a:hover {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text);
    text-decoration: none;
    border-left-color: var(--color-border);
}

.sidebar-nav a.active {
    background-color: var(--color-primary-bg);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    font-weight: 500;
}

/* Section Navigation in Sidebar */
.section-nav {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
}

.section-nav h4 {
    padding: 0 1.5rem;
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin: 0 0 0.75rem 0;
    font-weight: 600;
}

.section-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.section-nav a {
    padding: 0.375rem 1.5rem 0.375rem 2rem;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    border-left: none;
}

.section-nav a:hover {
    color: var(--color-text);
    background-color: transparent;
    border-left: none;
}

/* Main Content */
.content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 2.5rem 3rem;
    max-width: calc(var(--content-max-width) + var(--sidebar-width) + 6rem);
}

/* Hero Section */
.hero {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--color-border);
}

.hero .chapter-number {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero h1 {
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* Sections */
section {
    margin-bottom: 2.5rem;
}

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

/* What You Will Learn */
.what-you-will-learn {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 2rem 0;
}

.what-you-will-learn h2 {
    margin-top: 0;
    padding-bottom: 0;
    border-bottom: none;
    font-size: 1.25rem;
    color: var(--color-success);
}

.what-you-will-learn ul {
    margin-bottom: 0;
}

.what-you-will-learn li {
    color: var(--color-text-secondary);
}

/* Prerequisites */
.prerequisites {
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 2rem 0;
}

.prerequisites h2 {
    margin-top: 0;
    padding-bottom: 0;
    border-bottom: none;
    font-size: 1.25rem;
    color: var(--color-warning);
}

.prerequisites ul {
    margin-bottom: 0;
}

/* Homepage Styles */
.home-hero {
    text-align: center;
    padding: 4rem 0 3rem;
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--color-border);
    position: relative;
}

.home-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 300px;
    background: radial-gradient(ellipse at center, var(--color-primary-bg) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.home-hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 50%, var(--color-accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.home-hero .subtitle {
    font-size: 1.35rem;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2.5rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-top: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-bg);
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    text-decoration: none;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-bg-secondary);
    border-color: var(--color-text-muted);
    text-decoration: none;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin: 2rem 0;
}

.feature-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 1.75rem;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background-color: var(--color-primary-bg);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    color: var(--color-primary);
}

.feature-card h3 {
    font-size: 1.125rem;
    margin: 0 0 0.5rem 0;
}

.feature-card p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* Roadmap Grid */
.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.roadmap-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1.5rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.roadmap-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.roadmap-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.roadmap-card:hover::before {
    opacity: 1;
}

.chapter-number {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
    padding: 0.25rem 0.5rem;
    background-color: rgba(163, 113, 247, 0.1);
    border-radius: 4px;
}

.roadmap-card h3 {
    margin: 0 0 0.75rem 0;
    font-size: 1.25rem;
    color: var(--color-text);
}

.roadmap-card p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.card-link {
    font-size: 0.875rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
}

.card-link::after {
    content: '\2192';
    transition: transform var(--transition-fast);
}

.card-link:hover::after {
    transform: translateX(4px);
}

/* Code Playground Section */
.playground-section {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 2rem;
    margin: 3rem 0;
}

.playground-section h2 {
    margin-top: 0;
    border-bottom: none;
    padding-bottom: 0;
    text-align: center;
}

.playground-description {
    text-align: center;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* Code Blocks */
pre {
    background-color: var(--color-code-bg);
    border: 1px solid var(--color-code-border);
    border-radius: 8px;
    padding: 1.25rem;
    overflow-x: auto;
    margin: 1.5rem 0;
    position: relative;
}

code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.875rem;
    color: var(--color-text);
}

p code,
li code {
    background-color: var(--color-bg-tertiary);
    padding: 0.125rem 0.5rem;
    border-radius: 4px;
    font-size: 0.875em;
    color: var(--color-primary);
}

pre code {
    background: none;
    padding: 0;
    color: var(--color-text);
}

/* Syntax Highlighting */
.keyword {
    color: var(--color-accent);
}

.string {
    color: #a5d6ff;
}

.comment {
    color: var(--color-text-muted);
    font-style: italic;
}

.function {
    color: #d2a8ff;
}

.number {
    color: #79c0ff;
}

/* Code with filename */
.code-block {
    position: relative;
}

.code-block .filename {
    position: absolute;
    top: 0;
    right: 0;
    background-color: var(--color-bg-tertiary);
    padding: 0.375rem 0.875rem;
    font-size: 0.75rem;
    border-radius: 0 8px 0 8px;
    color: var(--color-text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

/* Copy Button */
.copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.375rem 0.75rem;
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-fast);
}

pre:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background-color: var(--color-border);
    color: var(--color-text);
}

/* Info Boxes */
.info-box {
    padding: 1.25rem 1.5rem;
    border-radius: 8px;
    margin: 1.5rem 0;
    border-left: 4px solid;
}

.info-box.note {
    background-color: var(--color-primary-bg);
    border-color: var(--color-primary);
}

.info-box.warning {
    background-color: var(--color-warning-bg);
    border-color: var(--color-warning);
}

.info-box.tip {
    background-color: var(--color-success-bg);
    border-color: var(--color-success);
}

.info-box-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.info-box.note .info-box-title {
    color: var(--color-primary);
}

.info-box.warning .info-box-title {
    color: var(--color-warning);
}

.info-box.tip .info-box-title {
    color: var(--color-success);
}

.info-box p:last-child {
    margin-bottom: 0;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background-color: var(--color-bg-secondary);
    border-radius: 8px;
    overflow: hidden;
}

th, td {
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

th {
    background-color: var(--color-bg-tertiary);
    font-weight: 600;
    color: var(--color-text);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background-color: var(--color-bg-tertiary);
}

/* Chapter Navigation */
.chapter-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.chapter-nav a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.25rem;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.chapter-nav a:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-bg);
    text-decoration: none;
}

.chapter-nav .prev::before {
    content: '\2190';
}

.chapter-nav .next::after {
    content: '\2192';
}

/* Footer */
.footer {
    margin-left: var(--sidebar-width);
    padding: 2rem 3rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    background-color: var(--color-bg-secondary);
}

/* Practice Section */
.practice-questions {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1.75rem;
    margin: 2rem 0;
}

.practice-questions h4 {
    margin-top: 0;
    color: var(--color-success);
    font-size: 1.125rem;
}

.practice-questions ol {
    margin-bottom: 0;
}

.practice-questions li {
    color: var(--color-text-secondary);
    padding: 0.25rem 0;
}

/* Common Mistakes */
.common-mistakes {
    margin: 1.5rem 0;
}

.mistake {
    margin-bottom: 1.5rem;
    padding: 1.25rem 1.5rem;
    background-color: var(--color-error-bg);
    border-left: 4px solid var(--color-error);
    border-radius: 8px;
}

.mistake-title {
    font-weight: 600;
    color: var(--color-error);
    margin-bottom: 0.75rem;
}

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

/* Code Quiz Styles */
.code-quiz {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

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

.progress-bar {
    width: 200px;
    height: 8px;
    background-color: var(--color-bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--color-success);
    transition: width var(--transition-normal);
}

.quiz-score {
    font-weight: 600;
    color: var(--color-primary);
}

.quiz-question {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    color: var(--color-text);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.quiz-option {
    padding: 1rem 1.25rem;
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
    font-size: 1rem;
    color: var(--color-text);
}

.quiz-option:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-bg);
}

.quiz-option.correct {
    border-color: var(--color-success);
    background-color: var(--color-success-bg);
}

.quiz-option.incorrect {
    border-color: var(--color-error);
    background-color: var(--color-error-bg);
}

.quiz-option.disabled {
    pointer-events: none;
}

.quiz-feedback {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 8px;
    display: none;
}

.quiz-feedback.show {
    display: block;
}

.quiz-feedback.correct {
    background-color: var(--color-success-bg);
    color: var(--color-success);
}

.quiz-feedback.incorrect {
    background-color: var(--color-error-bg);
    color: var(--color-error);
}

.quiz-next {
    margin-top: 1rem;
}

/* Typing Game Styles */
.typing-game {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
    text-align: center;
}

.typing-game h3 {
    margin-top: 0;
}

.typing-display {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    padding: 2rem;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    margin: 1.5rem 0;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.typing-display .correct-char {
    color: var(--color-success);
}

.typing-display .incorrect-char {
    color: var(--color-error);
    text-decoration: underline;
}

.typing-display .current-char {
    background-color: var(--color-primary-bg);
    border-bottom: 2px solid var(--color-primary);
}

.typing-input {
    width: 100%;
    padding: 1rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.125rem;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition-fast);
}

.typing-input:focus {
    border-color: var(--color-primary);
}

.typing-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1.5rem;
}

.typing-stat {
    text-align: center;
}

.typing-stat-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
}

.typing-stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.3s ease;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.pulse {
    animation: pulse 2s infinite;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .content {
        padding: 2rem;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-stats {
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 99;
    }

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

    .content {
        margin-left: 0;
        padding: 1.5rem;
    }

    .footer {
        margin-left: 0;
        padding: 1.5rem;
    }

    .home-hero h1 {
        font-size: 2.5rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .roadmap-grid {
        grid-template-columns: 1fr;
    }

    .chapter-nav {
        flex-direction: column;
        gap: 1rem;
    }

    .chapter-nav a {
        justify-content: center;
    }

    .typing-stats {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .sidebar,
    .chapter-nav,
    .code-quiz,
    .typing-game {
        display: none;
    }

    .content {
        margin-left: 0;
        max-width: 100%;
    }

    pre {
        white-space: pre-wrap;
        word-wrap: break-word;
    }

    body {
        color: #000;
        background: #fff;
    }
}