/* Nguyen AI public site — shared styles */
:root{--bg:#0a0e1a;--fg:#e8eef7;--muted:#8b9bb4;--accent:#4f8cff;--card:#131826;--border:#1f2740;--ok:#22c55e;--warn:#f59e0b;--err:#ef4444}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--fg);line-height:1.6}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:900px;margin:0 auto;padding:2rem 1rem}
h1{font-size:2rem;margin-bottom:1rem}
h2{font-size:1.4rem;margin:1.5rem 0 .5rem}
p{margin:.5rem 0}
.note{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:1rem;margin:1rem 0}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1.5rem;margin:1rem 0}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1rem}
.badge{display:inline-block;padding:.2rem .6rem;border-radius:4px;font-size:.8rem;font-weight:600}
.badge-warn{background:rgba(245,158,11,.15);color:var(--warn)}
.badge-ok{background:rgba(34,197,94,.15);color:var(--ok)}
header{border-bottom:1px solid var(--border);padding:1rem 0}
header .container{display:flex;justify-content:space-between;align-items:center}
header nav a{margin-left:1rem}
footer{border-top:1px solid var(--border);padding:2rem 0;margin-top:3rem;color:var(--muted);font-size:.9rem}
.lang-switch{position:absolute;top:1rem;right:1rem}
.lang-switch a{margin-left:.5rem;font-size:.85rem}
@media(max-width:768px){.grid{grid-template-columns:1fr}header .container{flex-direction:column;gap:.5rem}}