:root{--primary-color:#3b82f6;--primary-dark:#2563eb;--secondary-color:#6366f1;--text-color:#1e293b;--light-text:#64748b;--background:#fff;--card-bg:#f8fafc;--border-color:#e2e8f0;--section-padding:5rem 2rem}body,html{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;color:var(--text-color);line-height:1.6}*,body,html{padding:0;margin:0}*{box-sizing:border-box}a{color:inherit;text-decoration:none}h1,h2,h3,h4,h5,h6{margin:0 0 15px}p{margin:0 0 10px}ul{list-style:none}img{max-width:100%;height:auto}header{background-color:var(--background);box-shadow:0 2px 10px rgba(0,0,0,.1);position:-webkit-sticky;position:sticky;top:0;z-index:100}footer{background-color:var(--card-bg);padding:4rem 2rem 2rem}