:root{--blue:#00a6ff;--blue-dark:#0878c9;--navy:#12304a;--ink:#263746;--muted:#647889;--line:#dceaf3;--soft:#f4faff;--white:#fff;--shadow:0 18px 50px rgba(14,104,160,.1)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:96px}body{margin:0;font-family:"Noto Sans Thai","Leelawadee UI",Tahoma,Arial,sans-serif;color:var(--ink);background:linear-gradient(180deg,#fff 0,#f8fcff 55%,#fff 100%);line-height:1.82;font-size:17px}a{color:inherit}.skip-link{position:fixed;top:-80px;left:20px;z-index:99;padding:10px 16px;background:#fff;color:var(--blue-dark);border-radius:8px}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);border-bottom:1px solid rgba(215,235,247,.8);backdrop-filter:blur(14px)}.header-inner{width:min(1180px,calc(100% - 40px));height:76px;margin:auto;display:flex;align-items:center;justify-content:space-between}.brand{display:inline-flex;align-items:baseline;text-decoration:none;font-weight:900;font-size:27px;letter-spacing:-1.6px;color:#16324a}.brand b{color:var(--blue);font-size:34px}.main-menu a{text-decoration:none;font-weight:700;padding:12px 18px;border-radius:999px}.main-menu a:hover,.main-menu a:focus-visible{color:var(--blue-dark);background:#ebf8ff}.menu-toggle{display:none;background:none;border:0}.hero{position:relative;min-height:440px;background:#eef9ff var(--hero-image) center/cover no-repeat;border-bottom:1px solid var(--line);overflow:hidden}.hero:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(255,255,255,.98) 0%,rgba(255,255,255,.9) 36%,rgba(255,255,255,.2) 66%,rgba(255,255,255,0) 100%)}.hero-inner{position:relative;z-index:1;width:min(1180px,calc(100% - 40px));min-height:440px;margin:auto;display:flex;flex-direction:column;justify-content:center;align-items:flex-start}.hero h1{width:min(650px,56%);margin:5px 0 18px;color:#12324c;font-size:clamp(36px,4.4vw,63px);line-height:1.16;letter-spacing:-1px}.eyebrow{margin:0;color:var(--blue-dark);font-size:14px;font-weight:900;letter-spacing:.14em}.hero-line{width:72px;height:5px;border-radius:10px;background:var(--blue)}.layout{width:min(1180px,calc(100% - 40px));margin:58px auto 90px;display:grid;grid-template-columns:270px minmax(0,1fr);gap:46px;align-items:start}.toc{position:sticky;top:100px}.toc-panel{padding:24px;background:rgba(255,255,255,.9);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);max-height:calc(100vh - 125px);overflow:auto}.toc-panel>strong{display:block;color:var(--navy);font-size:20px;margin-bottom:14px}.toc ol{margin:0;padding:0;list-style:none}.toc li{border-top:1px solid #edf3f7}.toc li:first-child{border-top:0}.toc li a{display:block;padding:10px 0;color:#526a7b;text-decoration:none;font-size:14px;line-height:1.5}.toc li.h3 a{padding-left:14px;font-size:13px}.toc li a:hover,.toc li a.active{color:var(--blue-dark);font-weight:700}.toc-toggle{display:none}.article{min-width:0;background:#fff;padding:clamp(28px,5vw,62px);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow)}.article>h1{display:none}.article h2,.article h3{color:var(--navy);line-height:1.35;scroll-margin-top:105px}.article h2{margin:52px 0 18px;padding-top:4px;font-size:clamp(25px,2.7vw,34px);position:relative}.article h2:before{content:"";position:absolute;left:0;top:-10px;width:40px;height:4px;border-radius:4px;background:var(--blue)}.article h3{font-size:22px;margin:34px 0 12px}.article p{margin:0 0 19px}.article strong{color:#183a54}.article ul,.article ol{margin:10px 0 26px;padding-left:26px}.article li{margin:8px 0;padding-left:5px}.article li::marker{color:var(--blue);font-weight:800}.article a{color:var(--blue-dark);text-decoration-thickness:1px;text-underline-offset:3px}.article blockquote{margin:28px 0;padding:20px 24px;border-left:4px solid var(--blue);background:var(--soft);border-radius:0 14px 14px 0}.site-footer{background:#102f48;color:#dbeaf4}.footer-inner{width:min(1180px,calc(100% - 40px));margin:auto;padding:54px 0 30px;display:grid;grid-template-columns:280px 1fr;gap:40px}.brand-light{color:#fff}.footer-brand p{margin:5px 0;color:#a9c1d1}.site-footer nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 26px}.site-footer nav a{color:#dbeaf4;text-decoration:none;padding:7px 0}.site-footer nav a:hover{color:#fff}.copyright{grid-column:1/-1;margin:28px 0 0;padding-top:22px;border-top:1px solid rgba(255,255,255,.12);color:#88a8bd;font-size:14px}
@media(max-width:900px){.layout{grid-template-columns:1fr;gap:20px;margin-top:28px}.toc{position:sticky;top:88px;z-index:20}.toc-toggle{display:flex;width:100%;align-items:center;justify-content:space-between;padding:14px 18px;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--navy);font:inherit;font-weight:800;box-shadow:0 8px 24px rgba(14,104,160,.09)}.toc-panel{display:none;margin-top:8px;max-height:62vh}.toc.open .toc-panel{display:block}.hero,.hero-inner{min-height:360px}.hero h1{width:min(660px,75%);font-size:clamp(32px,7vw,52px)}}
@media(max-width:640px){body{font-size:16px}.header-inner{width:calc(100% - 28px);height:68px}.menu-toggle{display:flex;width:42px;height:42px;padding:9px;flex-direction:column;justify-content:center;gap:5px}.menu-toggle span{display:block;height:2px;background:var(--navy);border-radius:2px}.menu-toggle i{position:absolute;clip:rect(0 0 0 0)}.main-menu{display:none;position:absolute;left:14px;right:14px;top:62px;padding:10px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}.main-menu.open{display:block}.main-menu a{display:block}.hero{min-height:390px;background-position:68% center}.hero:after{background:linear-gradient(90deg,rgba(255,255,255,.98),rgba(255,255,255,.82) 72%,rgba(255,255,255,.36))}.hero-inner{min-height:390px;width:calc(100% - 32px);justify-content:flex-end;padding-bottom:42px}.hero h1{width:100%;font-size:33px}.layout{width:calc(100% - 28px);margin-bottom:54px}.article{padding:28px 22px;border-radius:18px}.article h2{font-size:25px;margin-top:46px}.footer-inner{width:calc(100% - 36px);grid-template-columns:1fr}.site-footer nav{grid-template-columns:1fr}.copyright{margin-top:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}