:root{--bg:#f6f7f5;--fg:#1d2420;--muted:#5d6862;--line:#dfe4e0;--brand:#1f6b4a}
@media (prefers-color-scheme:dark){:root{--bg:#141816;--fg:#e8ece9;--muted:#9aa59f;--line:#2b322e;--brand:#6fcf9d}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
header{background:#163f2f;padding:12px 16px}
header a{color:#fff;text-decoration:none;font-weight:700;display:inline-flex;align-items:center;gap:8px;font-size:17px}
main{max-width:760px;margin:0 auto;padding:24px 16px 56px}
h1{font-size:26px;margin:0 0 4px}
h2{font-size:18px;margin:28px 0 8px}
.ngay{color:var(--muted);margin:0 0 20px;font-size:14px}
a{color:var(--brand)}
li{margin:4px 0}