:root{
  --sand:#f7f2ea; --ink:#241f1a; --muted:#6b6259; --line:#e4dbcd;
  --brand:#a4562b; --brand-dark:#7c3f1e; --leaf:#3f6b4f; --white:#fffdfa;
  --radius:16px; --shadow:0 10px 30px rgba(60,40,20,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--sand);color:var(--ink);
  font-family:"Noto Sans Thai","Sarabun",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:17px;line-height:1.85;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand-dark)}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
/* header */
header.site{position:sticky;top:0;z-index:50;background:rgba(255,253,250,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:18px;justify-content:space-between;padding:14px 0}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;letter-spacing:.14em}
.brand span.dot{width:12px;height:12px;border-radius:50%;background:var(--brand)}
.brand small{display:block;font-weight:500;letter-spacing:normal;font-size:12px;color:var(--muted)}
nav ul{display:flex;flex-wrap:wrap;gap:6px;list-style:none;margin:0;padding:0}
nav a{display:inline-block;padding:8px 12px;border-radius:999px;text-decoration:none;color:var(--ink);font-size:15px}
nav a:hover{background:#f0e7da}
nav a.active{background:var(--brand);color:#fff}
/* hero */
.hero{position:relative;overflow:hidden;background:#efe6d8}
.hero .grid{display:grid;grid-template-columns:1.05fr 1fr;gap:36px;align-items:center;padding:60px 0}
.eyebrow{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:14px;color:var(--brand-dark)}
h1{font-size:clamp(30px,4.4vw,50px);line-height:1.35;margin:16px 0}
h2{font-size:clamp(23px,2.8vw,32px);line-height:1.45;margin:44px 0 12px}
h3{font-size:20px;margin:26px 0 8px}
p{margin:0 0 16px}
.lead{font-size:19px;color:#3c342c}
.btn{display:inline-block;padding:13px 24px;border-radius:999px;text-decoration:none;font-weight:700;font-size:16px}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark)}
.btn-ghost{border:1px solid var(--brand);color:var(--brand-dark);background:#fff}
.btns{display:flex;flex-wrap:wrap;gap:12px;margin-top:8px}
/* sections */
section{padding:8px 0}
.section{padding:44px 0;border-top:1px solid var(--line)}
.card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:center}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
figure{margin:0}
figure img{border-radius:var(--radius);box-shadow:var(--shadow)}
figcaption{font-size:14px;color:var(--muted);margin-top:8px}
ul.check{list-style:none;padding:0;margin:0 0 16px}
ul.check li{padding-left:28px;position:relative;margin-bottom:8px}
ul.check li:before{content:"✓";position:absolute;left:0;color:var(--leaf);font-weight:800}
table{width:100%;border-collapse:collapse;background:var(--white);border-radius:12px;overflow:hidden;font-size:16px}
th,td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
th{background:#f1e8da}
blockquote{margin:0 0 16px;padding:16px 20px;background:#fff;border-left:4px solid var(--brand);border-radius:0 12px 12px 0}
.pill{display:inline-block;background:#f1e8da;border-radius:999px;padding:4px 12px;font-size:14px;margin:0 6px 6px 0}
details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 16px;margin-bottom:10px}
summary{cursor:pointer;font-weight:700}
.toc{background:#fff;border:1px dashed var(--brand);border-radius:var(--radius);padding:18px 22px}
.toc ol{margin:0;padding-left:22px}
footer.site{background:#241f1a;color:#e9e0d3;margin-top:50px}
footer.site a{color:#f0c9a8}
footer .grid3{padding:44px 0}
footer h4{margin:0 0 10px;font-size:17px}
footer ul{list-style:none;padding:0;margin:0}
footer li{margin-bottom:6px}
.copy{border-top:1px solid #3a332b;padding:16px 0;font-size:14px;color:#b8ada0}
.floatline{position:fixed;right:18px;bottom:18px;z-index:60;background:var(--leaf);color:#fff;
  padding:12px 18px;border-radius:999px;text-decoration:none;font-weight:700;box-shadow:var(--shadow)}
@media(max-width:860px){
  .hero .grid,.grid2,.grid3,.grid4{grid-template-columns:1fr}
  body{font-size:16px}
}