:root{--font-sans: "Instrument Sans", ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.6;color:#333;background:#fafafa}.container{max-width:1200px;margin:0 auto;padding:0 20px}img{display:block;max-width:100%;height:auto}.btn{display:inline-block;padding:10px 20px;border:none;border-radius:4px;cursor:pointer;text-decoration:none;transition:all .3s ease}.btn-primary{background-color:#007bff;color:#fff}.btn-primary:hover{background-color:#0056b3}@media (max-width: 768px){.container{padding:0 15px}}