:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #1e293b;
    --light: #f8fafc;
    --gray: #94a3b8;
    --border-radius: 8px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fafafa;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header .tagline {
    font-size: 1.25rem;
    color: var(--secondary);
    max-width: 600px;
    margin: 0 auto;
}

.toggle-section {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.toggle {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.toggle-btn {
    flex: 1;
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--gray);
    border-radius: var(--border-radius);
    background: white;
    color: var(--dark);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.toggle-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.toggle-btn:hover:not(.active) {
    background: #f1f5f9;
    border-color: var(--primary);
}

.toggle-description {
    text-align: center;
    color: var(--gray);
    font-size: 0.9rem;
}

main {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.content h2 {
    color: var(--dark);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary);
}

.content h3 {
    color: var(--primary-dark);
    margin-bottom: 1rem;
}

.content p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.content ul, .content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.content li {
    margin-bottom: 0.5rem;
}

.content code {
    background: #f1f5f9;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.content pre {
    background: #f8fafc;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
    border: 1px solid #e2e8f0;
}

.content pre code {
    background: none;
    padding: 0;
    color: inherit;
    font-size: 0.9rem;
}

.content blockquote {
    border-left: 4px solid var(--primary);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: var(--gray);
    font-style: italic;
}

footer {
    text-align: center;
    margin-top: 3rem;
    padding: 2rem;
    color: var(--gray);
    font-size: 0.9rem;
    border-top: 1px solid #e2e8f0;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    header .tagline {
        font-size: 1.1rem;
    }
    
    .toggle {
        flex-direction: column;
    }
    
    .toggle-btn {
        padding: 1rem;
    }
    
    main {
        padding: 1.5rem;
    }
}