:root{--ink:#24323D;--muted:#5E6B75;--bg:#FBFCFD;--card:#FFF;--line:#E3E9EE;--brand:#1F6F5C}
@media(prefers-color-scheme:dark){:root{--ink:#E7EDF2;--muted:#A9B6C1;--bg:#101820;--card:#18222C;--line:#26323D;--brand:#7FC8B4}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);
 font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans Khmer","Khmer OS Battambang",sans-serif}
main{max-width:44rem;margin:0 auto;padding:2.5rem 1.25rem 4rem}
h1{font-size:1.65rem;line-height:1.35;margin:0 0 .35rem}
h2{font-size:1.1rem;margin:2rem 0 .5rem}
.sub{color:var(--muted);font-size:.9rem;margin:0 0 2rem}
section{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1rem 1.15rem;margin:.5rem 0 1.25rem}
.km{margin:0 0 .6rem}
.en{margin:0;color:var(--muted);font-size:.94rem}
a{color:var(--brand)}
footer{color:var(--muted);font-size:.85rem;margin-top:2.5rem;border-top:1px solid var(--line);padding-top:1.25rem}