:root{--blue:#0066FF;--ink:#1a1f2b;--muted:#5b6474;--line:#e3e8f0}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:#fff;color:var(--ink);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
header{background:var(--blue);color:#fff}
.bar{max-width:820px;margin:0 auto;padding:16px 20px;display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between}
.brand{color:#fff;text-decoration:none;font-weight:800;font-size:1.25rem;letter-spacing:.2px}
nav a{color:#fff;text-decoration:none;margin-left:16px;font-weight:600;opacity:.92}
nav a:hover,nav a[aria-current]{opacity:1;text-decoration:underline}
main{max-width:820px;margin:0 auto;padding:28px 20px 48px}
h1{color:var(--blue);font-size:clamp(1.6rem,4vw,2.2rem);line-height:1.2;margin:.2em 0 .4em}
h2{color:var(--blue);font-size:1.2rem;margin:1.8em 0 .4em;padding-top:.6em;border-top:1px solid var(--line)}
a{color:var(--blue)}
blockquote{margin:1em 0;padding:10px 14px;border-left:4px solid var(--blue);background:#f2f7ff;color:var(--muted)}
blockquote p{margin:0}
ul{padding-left:1.3em}li{margin:.25em 0}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-top:20px}
.card{display:block;border:2px solid var(--blue);border-radius:12px;padding:20px;text-decoration:none;color:var(--ink)}
.card:hover{background:var(--blue);color:#fff}
.card strong{display:block;font-size:1.1rem;margin-bottom:4px}
.btn{display:inline-block;background:var(--blue);color:#fff;padding:10px 18px;border-radius:8px;text-decoration:none;font-weight:600}
footer{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}
footer .bar{color:var(--muted)}footer a{color:var(--blue)}
@media(max-width:520px){nav a{margin:0 14px 0 0}.bar{justify-content:flex-start}}