:root{
  --bg:#fff;--tint:#f6f5fc;--ink:#252336;--muted:#625e70;--line:#e6e3ef;
  --brand:#5145b8;--brand-deep:#352c7c;--warn:#8a4b08;--warn-bg:#fff7e8;
  --r:18px;--sans:"Noto Sans Thai",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.75}
a{color:var(--brand);text-underline-offset:3px}
a:hover{color:var(--brand-deep)}
.shell{width:min(900px,calc(100% - 40px));margin-inline:auto}
header{border-bottom:1px solid var(--line);background:#fff}
header .shell{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-size:20px;font-weight:700;text-decoration:none}
.brand img{width:32px;height:32px;border-radius:9px}
.back{font-size:14px;text-decoration:none}
main{padding:48px 0 72px}
h1,h2,h3{line-height:1.3;letter-spacing:-.02em}
h1{font-size:clamp(32px,6vw,50px);margin:0 0 10px}
h2{font-size:25px;margin:48px 0 12px;padding-top:8px}
h3{font-size:19px;margin:28px 0 8px}
p{margin:0 0 14px}
ul,ol{padding-left:24px;margin:8px 0 18px}
li+li{margin-top:6px}
.meta{color:var(--muted);margin-bottom:28px}
.draft{padding:18px 20px;border:1px solid #f0c985;background:var(--warn-bg);color:#6d3d08;border-radius:var(--r);margin:24px 0 32px}
.draft strong{display:block;color:var(--warn);margin-bottom:4px}
.note{padding:16px 18px;background:var(--tint);border-radius:var(--r);margin:20px 0}
table{width:100%;border-collapse:collapse;margin:18px 0 28px;font-size:15px}
th,td{text-align:left;vertical-align:top;padding:12px;border-bottom:1px solid var(--line)}
th{background:var(--tint)}
nav.toc{padding:20px;border:1px solid var(--line);border-radius:var(--r)}
nav.toc a{display:block;padding:3px 0}
footer{border-top:1px solid var(--line);padding:28px 0;color:var(--muted);font-size:14px}
footer .shell{display:flex;flex-wrap:wrap;gap:12px 22px}
@media(max-width:640px){.shell{width:min(100% - 28px,900px)}main{padding-top:32px}table{display:block;overflow-x:auto}header .shell{min-height:64px}}
@media print{header,footer,.back{display:none}.shell{width:100%}main{padding:0}.draft{break-inside:avoid}}