:root{--ink:#171a23;--muted:#5d6475;--line:#e6e8ee;--bg:#f5f6fa;--red:#e5283c;--card:#fff}
@media (prefers-color-scheme:dark){:root{--ink:#e7e9ef;--muted:#a3a9b8;--line:#2c3242;--bg:#151925;--card:#1c2130}}
*{box-sizing:border-box}
body{margin:0;font:16px/1.75 'IBM Plex Sans Thai','Noto Sans Thai','Leelawadee UI',system-ui,sans-serif;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
header{max-width:820px;margin:0 auto;padding:28px 20px 0;display:flex;align-items:center;justify-content:space-between;gap:16px}
header a.brand{font-weight:700;letter-spacing:.5px;color:var(--ink);text-decoration:none}
header nav a{color:var(--muted);text-decoration:none;font-size:14px;margin-left:16px}
header nav a:hover{color:var(--red)}
main{max-width:820px;margin:20px auto 48px;padding:36px 40px;background:var(--card);border:1px solid var(--line);border-radius:20px}
h1{font-size:30px;line-height:1.3;margin:0 0 6px;letter-spacing:-.4px}
.upd{color:var(--muted);font-size:14px;margin:0 0 28px}
h2{font-size:19px;margin:32px 0 8px}
p,li{color:var(--ink)}ul{padding-left:22px}li{margin:4px 0}
a{color:var(--red)}
footer{max-width:820px;margin:0 auto 40px;padding:0 20px;color:var(--muted);font-size:13px;text-align:center}
@media(max-width:640px){main{padding:24px 18px;border-radius:16px;margin:14px 12px 32px}h1{font-size:24px}header{padding:20px 16px 0}}