:root{--fg:#0f172a;--muted:#64748b;--bg:#fff;--brand:#0ea5e9}
*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);font:16px/1.7 system-ui,-apple-system,Segoe UI,Roboto}
.container{max-width:980px;margin:0 auto;padding:0 16px}
header.site-header{position:fixed;top:0;left:0;right:0;background:#fff;border-bottom:1px solid #e2e8f0;z-index:1000}
header .nav{display:flex;gap:12px;align-items:center;justify-content:space-between;padding:10px 16px}
header .nav a{color:var(--fg);text-decoration:none;padding:6px 10px;border-radius:10px}
header .nav a:hover{background:#f1f5f9}
.btn{display:inline-block;padding:.7rem 1.1rem;border-radius:.75rem;border:1px solid #e2e8f0;text-decoration:none}
.btn.primary{background:var(--brand);color:#fff;border-color:var(--brand)}
.hero{padding-top:84px}
h1{font-size:1.9rem;margin:.5rem 0 1rem}
h2{font-size:1.35rem;margin:1.5rem 0 .75rem}
.card{border:1px solid #e2e8f0;border-radius:1rem;padding:1rem;margin:1rem 0}
ul,ol{padding-left:1.25rem}
footer{margin:3rem 0 2rem;color:var(--muted);text-align:center}
.muted{color:var(--muted)}