body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#f7f7fb;color:#0f172a}.app{min-height:100vh}.nav{display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;background:#0f172a;color:#fff}.nav .logo{font-weight:700}.nav .nav-links{list-style:none;display:flex;gap:.5rem;margin:0;padding:0}.nav button{background:transparent;border:none;color:inherit;padding:.5rem .75rem;cursor:pointer}.nav button.active{background:#ffffff14;border-radius:4px}.container{padding:2rem;max-width:900px;margin:0 auto;text-align:left}section h1,section h2{margin:0 0 .5rem}section p{line-height:1.6}