:root{--blue:#00a6ff;--blue2:#087fc5;--ink:#102a43;--muted:#597084;--bg:#f5fbff;--line:#d8edf9;--white:#fff;--shadow:0 18px 50px rgba(23,84,121,.12)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:96px}body{margin:0;font-family:"Noto Sans Thai",Tahoma,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.8}.skip{position:fixed;left:12px;top:-60px;background:#111;color:#fff;padding:8px 15px;z-index:20}.skip:focus{top:12px}a{color:var(--blue2)}img{max-width:100%}.header{position:sticky;top:0;z-index:12;background:rgba(255,255,255,.9);backdrop-filter:blur(14px);border-bottom:1px solid rgba(0,166,255,.13)}.header-in{max-width:1240px;height:76px;margin:auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between}.brand{font-size:25px;font-weight:900;letter-spacing:-1px;text-decoration:none;color:#11415e}.brand b{color:var(--blue)}.nav a{font-weight:800;text-decoration:none;color:var(--ink);padding:10px 14px;border-radius:999px}.nav a:hover{background:#e7f7ff;color:var(--blue2)}.menu-btn{display:none;border:0;background:#e8f7ff;border-radius:12px;padding:10px 13px;font-weight:800;color:var(--ink)}
.hero{max-width:1240px;min-height:390px;margin:28px auto 44px;padding:70px 7%;border-radius:36px;position:relative;overflow:hidden;display:flex;align-items:center;background:linear-gradient(100deg,#eafbff 0%,#fff 45%,rgba(255,255,255,.03) 70%),var(--img) center right/cover no-repeat;box-shadow:var(--shadow)}.hero:before{content:"";position:absolute;width:300px;height:300px;border:1px solid rgba(0,166,255,.2);border-radius:50%;left:-145px;top:-155px}.hero-copy{position:relative;max-width:650px}.kicker{margin:0 0 12px;color:var(--blue2);font-weight:900;letter-spacing:.06em}.hero-title{font-size:clamp(2rem,4vw,3.5rem);font-weight:900;line-height:1.25;margin:0}.accent{width:74px;height:6px;margin-top:28px;background:var(--blue);border-radius:9px}
.shell{max-width:1240px;margin:0 auto 80px;padding:0 24px;display:grid;grid-template-columns:280px minmax(0,1fr);gap:34px;align-items:start}.toc{position:sticky;top:100px;background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 12px 35px rgba(32,94,128,.08);max-height:calc(100vh - 125px);overflow:auto}.toc-title{display:flex;gap:10px;align-items:center;font-size:1.05rem;font-weight:900;margin-bottom:15px}.toc-title:before{content:"";width:5px;height:22px;background:var(--blue);border-radius:4px}.toc ol{margin:0;padding-left:20px}.toc li{margin:8px 0;color:#9ab2c2}.toc li.sub{padding-left:10px;font-size:.9em}.toc a{text-decoration:none;color:#49677a}.toc a:hover,.toc a.active{color:var(--blue2);font-weight:800}.article{background:#fff;border-radius:28px;padding:clamp(25px,5vw,64px);box-shadow:var(--shadow);min-width:0}.article h1{font-size:2.2rem;line-height:1.35}.article h2{font-size:1.65rem;line-height:1.45;margin:2.2em 0 .7em;padding-left:17px;border-left:5px solid var(--blue)}.article h3{font-size:1.25rem;margin:1.7em 0 .45em;color:#075d92}.article p{margin:0 0 1.15em}.article ul,.article ol{padding-left:25px}.article li{margin:.5em 0}.article .lead-image{width:100%;max-height:360px;object-fit:cover;border-radius:20px;margin:0 0 34px}.footer{background:#092f47;color:#d8edf8;padding:58px 24px 26px}.footer-in{max-width:1240px;margin:auto}.footer-top{display:grid;grid-template-columns:430px 1fr;gap:40px}.footer .brand{color:#fff}.footer nav{display:flex;flex-wrap:wrap;gap:10px 24px}.footer nav a{color:#d8edf8;text-decoration:none}.copy{border-top:1px solid rgba(255,255,255,.14);margin-top:35px;padding-top:20px;color:#8fbbd2;font-size:.9rem}
@media(max-width:800px){.menu-btn{display:block}.nav{display:none;position:absolute;left:16px;right:16px;top:68px;background:#fff;padding:12px;border-radius:16px;box-shadow:var(--shadow)}.nav.open{display:block}.nav a{display:block}.hero{margin:16px 14px 28px;min-height:330px;padding:45px 26px;background:linear-gradient(90deg,rgba(240,251,255,.95),rgba(255,255,255,.58)),var(--img) 65% center/cover}.shell{grid-template-columns:1fr;padding:0 14px}.toc{position:relative;top:auto;max-height:none}.toc ol{display:none}.toc.open ol{display:block}.toc-title{margin:0;cursor:pointer}.toc.open .toc-title{margin-bottom:15px}.article{padding:27px 22px}.article h1{font-size:1.8rem}.article h2{font-size:1.4rem}.footer-top{grid-template-columns:1fr}}