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

:root {
    /* @tweakable color scheme */
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    --background-dark: #0f0f23;
    --background-medium: #1a1a2e;
    --background-light: #16213e;
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --border-color: #374151;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* @tweakable spacing and sizing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --border-radius: 12px;
    --border-radius-lg: 16px;
    
    /* @tweakable animation timings */
    --transition-fast: 0.15s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--background-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(6, 182, 212, 0.2) 0%, transparent 50%);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(1deg); }
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: var(--spacing-lg);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { filter: hue-rotate(0deg); }
    50% { filter: hue-rotate(30deg); }
}

.hero-subtitle {
    display: block;
    color: var(--text-secondary);
    font-weight: 300;
    margin-top: var(--spacing-sm);
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
    transition: all var(--transition-medium);
}

.hero-badge:hover {
    background: rgba(99, 102, 241, 0.2);
    transform: translateY(-2px);
}

.badge-icon {
    font-size: 1.1rem;
}

/* Navigation */
.nav-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 15, 35, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-content {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    overflow-x: auto;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: all var(--transition-medium);
    white-space: nowrap;
    position: relative;
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.1);
}

.nav-link.active {
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.15);
}

/* Main Content */
.main-content {
    padding: var(--spacing-xl) var(--spacing-lg);
}

.section {
    margin-bottom: var(--spacing-xl);
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.section-badge {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* @tweakable image display settings */
.image-showcase {
    margin: var(--spacing-lg) 0;
    text-align: center;
    background: var(--background-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

/* @tweakable large image dimensions */
.large-image {
    width: 100%;
    max-width: 800px;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: transform var(--transition-medium);
    cursor: zoom-in;
}

.large-image:hover {
    transform: scale(1.02);
}

/* @tweakable hero visual styling */
.hero-visual-container {
    margin: var(--spacing-lg) 0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-visual {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.3);
    transition: all var(--transition-slow);
}

.hero-visual:hover {
    transform: translateY(-10px);
    box-shadow: 0 30px 60px rgba(99, 102, 241, 0.4);
}

/* @tweakable image caption styling */
.image-caption {
    margin-top: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.9rem;
    font-style: italic;
    line-height: 1.5;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* @tweakable image modal for full-screen viewing */
.image-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    cursor: zoom-out;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.image-modal img {
    max-width: 95%;
    max-height: 95%;
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 30px;
    color: white;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    z-index: 1001;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 50%;
    transition: background var(--transition-fast);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Content Cards */
.content-card {
    background: var(--background-medium);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(10px);
    transition: all var(--transition-medium);
}

.content-card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.content-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.content-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.3rem;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.feature-item {
    background: var(--background-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: all var(--transition-medium);
}

.feature-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.2);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.feature-item h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.feature-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0;
}

/* Code Examples */
.code-example {
    background: var(--background-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin: var(--spacing-md) 0;
    font-family: 'JetBrains Mono', monospace;
}

.code-example.small {
    font-size: 0.85rem;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--background-light);
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.code-lang {
    color: var(--accent-color);
    font-weight: 500;
    font-size: 0.85rem;
}

.copy-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.code-example pre {
    padding: var(--spacing-md);
    margin: 0;
    overflow-x: auto;
}

.code-example code {
    color: var(--text-primary);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Syntax Rules */
.syntax-rules {
    background: var(--background-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-lg);
}

.syntax-rules h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.syntax-rules ul {
    list-style: none;
    padding: 0;
}

.syntax-rules li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.syntax-rules li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.syntax-rules code {
    background: var(--background-dark);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    color: var(--primary-color);
}

/* Example Grid */
.example-grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

@media (min-width: 768px) {
    .example-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .example-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Use Cases */
.use-case {
    background: var(--background-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.use-case h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

/* Type Grid */
.type-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.type-card {
    background: var(--background-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    transition: all var(--transition-medium);
}

.type-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary-color);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.15);
}

.type-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.type-icon {
    font-size: 1.5rem;
}

.type-card h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
    margin: 0;
}

.type-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
}

.type-example {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--background-dark);
    padding: var(--spacing-sm);
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
}

.type-example code {
    color: var(--primary-color);
}

.control-type {
    color: var(--accent-color);
    font-weight: 500;
}

/* Best Practices */
.practices-grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.practice-item {
    display: flex;
    gap: var(--spacing-md);
    background: var(--background-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: all var(--transition-medium);
}

.practice-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.practice-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.practice-icon.good {
    color: var(--success-color);
}

.practice-icon.warning {
    color: var(--warning-color);
}

.practice-icon.bad {
    color: var(--danger-color);
}

.practice-content h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.practice-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

/* Tips Section */
.tips-section {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.tips-section h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.3rem;
}

.tips-list {
    list-style: none;
    padding: 0;
}

.tips-list li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
    line-height: 1.6;
}

.tips-list li:before {
    content: "💡";
    position: absolute;
    left: 0;
    top: var(--spacing-sm);
}

.tips-list strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Footer */
.footer {
    background: var(--background-medium);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    text-align: center;
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-content p {
    color: var(--text-secondary);
    margin: 0;
}

.footer-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-content {
        padding: var(--spacing-sm) var(--spacing-md);
        gap: var(--spacing-md);
    }
    
    .main-content {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .content-card {
        padding: var(--spacing-md);
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .practice-item {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .type-grid {
        grid-template-columns: 1fr;
    }
    
    .example-grid {
        grid-template-columns: 1fr;
    }
}

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

/* Selection styles */
::selection {
    background: rgba(99, 102, 241, 0.3);
    color: var(--text-primary);
}

/* Focus styles for accessibility */
.nav-link:focus,
.copy-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Loading animation for code blocks */
.code-example {
    position: relative;
    overflow: hidden;
}

.code-example::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Hover effects for interactive elements */
.content-card,
.feature-item,
.type-card,
.practice-item {
    cursor: pointer;
}

/* Enhanced mobile touch targets */
@media (max-width: 768px) {
    .nav-link,
    .copy-btn {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}