:root{--primary: #667eea;--primary-hover: #5568d3;--secondary: #764ba2;--bg-light: #f9fafb;--bg-dark: #1f2937;--text: #1f2937;--text-light: #6b7280;--border: #e5e7eb;--success: #10b981;--error: #ef4444;--warning: #f59e0b}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.2}h1{font-size:3rem}h2{font-size:2.5rem}h3{font-size:2rem}h4{font-size:1.5rem}p{margin:1rem 0}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}@media (max-width: 768px){h1{font-size:2rem}h2{font-size:1.75rem}h3{font-size:1.5rem}}