:root{--b:#0069ff;--bd:#0050c8;--bg:#f6f9ff;--tx:#14213d;--mu:#5b6b86;--bo:#dbe5f5;--ok:#0a7f4f}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:'Noto Sans Thai',system-ui,-apple-system,'Segoe UI',sans-serif;color:var(--tx);background:#fff;line-height:1.85;font-size:17px}
a{color:var(--b)}a:hover{color:var(--bd)}
.wrap{max-width:1040px;margin:0 auto;padding:0 18px}
.hd{position:sticky;top:0;z-index:9;background:rgba(255,255,255,.96);backdrop-filter:blur(6px);border-bottom:1px solid var(--bo)}
.hdin{display:flex;align-items:center;gap:18px;min-height:62px}
.logo{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--tx);font-weight:500;white-space:nowrap}.logo b{color:var(--b)}
.nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}.nav a{padding:6px 10px;text-decoration:none;color:var(--tx);font-size:15px;border-radius:8px}.nav a:hover{background:var(--bg)}
.btn{display:inline-block;background:var(--b);color:#fff!important;padding:11px 20px;border-radius:10px;text-decoration:none;font-weight:700;border:2px solid var(--b);text-align:center}
.btn:hover{background:var(--bd);border-color:var(--bd)}.btn.sm{padding:7px 14px;font-size:14px}.btn.big{padding:14px 26px;font-size:18px}
.btn.ghost{background:#fff;color:var(--b)!important}.btn.ghost:hover{background:var(--bg)}
.hero{background:linear-gradient(180deg,#eaf2ff,#fff);padding:54px 0 36px;text-align:center}
.hero h1{font-size:clamp(28px,5vw,46px);line-height:1.3;margin:14px auto;max-width:820px}
.hero p{max-width:760px;margin:0 auto 18px;color:var(--mu)}
.pill{display:inline-block;background:#fff;border:1px solid var(--bo);color:var(--bd);padding:4px 14px;border-radius:99px;font-size:14px}
.herocta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin:22px 0 8px}.fine{font-size:13px;color:var(--mu)}
.feats{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:26px auto}
.feat{display:block;padding:18px;border:1px solid var(--bo);border-radius:14px;text-decoration:none;color:var(--tx);background:#fff}
.feat:hover{border-color:var(--b);box-shadow:0 6px 20px rgba(0,105,255,.1)}.feat strong{display:block;color:var(--b);font-size:19px}.feat span{color:var(--mu);font-size:15px;line-height:1.6;display:block}
h2{font-size:26px;line-height:1.4;margin:42px 0 12px}h3{font-size:20px;margin:28px 0 8px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:14px}
.card{display:flex;flex-direction:column;gap:6px;padding:18px;border:1px solid var(--bo);border-radius:14px;text-decoration:none;color:var(--tx);background:#fff}
.card:hover{border-color:var(--b);box-shadow:0 6px 20px rgba(0,105,255,.1)}.card strong{font-size:18px;line-height:1.5}.card>span:last-child{color:var(--mu);font-size:14.5px;line-height:1.65}
.tag{align-self:flex-start;background:#eaf2ff;color:var(--bd);font-size:12px;padding:1px 10px;border-radius:99px}
.calc{background:var(--bg);border:1px solid var(--bo);border-radius:16px;padding:8px 22px 22px;margin-top:34px}.calc h2{margin-top:18px}
.calcbox{display:grid;gap:8px;max-width:640px}.calcbox label{font-weight:700;font-size:15px;margin-top:6px}
select,input{font:inherit;padding:10px 12px;border:1px solid var(--bo);border-radius:10px;background:#fff;width:100%}
.res{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}.res div{background:#fff;border:1px solid var(--bo);border-radius:12px;padding:12px;text-align:center}
.res span{display:block;font-size:13px;color:var(--mu)}.res strong{font-size:22px;color:var(--b)}
.cta{display:flex;gap:18px;align-items:center;justify-content:space-between;background:linear-gradient(135deg,#0069ff,#0a3fb5);color:#fff;border-radius:16px;padding:22px 24px;margin:34px 0}
.cta strong{display:block;font-size:21px}.cta span{display:block;font-size:14.5px;opacity:.92;line-height:1.65;margin-top:4px}
.cta .btn{background:#fff;color:var(--bd)!important;border-color:#fff;white-space:nowrap}.cta .btn:hover{background:#eaf2ff}
.art{padding-top:20px;padding-bottom:30px;max-width:820px}.art h1{font-size:clamp(26px,4.4vw,38px);line-height:1.35;margin:10px 0}
.crumb{font-size:14px;color:var(--mu)}.crumb a{color:var(--mu)}
.meta{color:var(--mu);font-size:14px;margin:0}.lead{font-size:19px;color:#34476a;margin:14px 0}
.disc2{background:#fff8e6;border:1px solid #f3dca0;border-radius:10px;padding:9px 14px;font-size:14px;color:#6b5311;margin:14px 0}
.toc{background:var(--bg);border:1px solid var(--bo);border-radius:12px;padding:14px 20px;margin:20px 0}.toc ol{margin:6px 0 0;padding-left:22px;columns:1}.toc a{text-decoration:none}
article p,article li{overflow-wrap:anywhere}article ul,article ol{padding-left:26px}article li{margin:5px 0}
.note{background:#eaf6ef;border-left:4px solid var(--ok);padding:12px 16px;border-radius:0 10px 10px 0;margin:18px 0}
pre{background:#0e1a33;color:#e6efff;padding:14px 16px;border-radius:12px;overflow-x:auto;font-size:14px;line-height:1.6;max-width:100%}
code{font-family:ui-monospace,Menlo,Consolas,monospace;background:#eef3fb;padding:1px 6px;border-radius:6px;font-size:.9em;overflow-wrap:anywhere}pre code{background:none;padding:0}
.tw{overflow-x:auto;margin:18px 0}table{border-collapse:collapse;width:100%;font-size:15px;min-width:520px}th,td{border:1px solid var(--bo);padding:9px 12px;text-align:left;vertical-align:top}th{background:var(--bg)}
.related{margin-top:30px}
.ft{background:#0e1a33;color:#b8c6e0;margin-top:50px;padding:34px 0 20px;font-size:14.5px}.ft a{color:#cfe0ff;display:block;margin:4px 0;text-decoration:none}.ft strong{color:#fff;display:block;margin-bottom:6px}
.ftgrid{display:grid;grid-template-columns:2fr 1.2fr 1.4fr;gap:24px}.ft p{line-height:1.7}.disc{font-size:12.5px;opacity:.8;border-top:1px solid #243558;padding-top:14px;margin-top:20px}.copy{font-size:13px}
@media(max-width:900px){.nav{display:none}.btn.sm{margin-left:auto}.ftgrid{grid-template-columns:1fr}}
@media(max-width:640px){body{font-size:16px}.cta{flex-direction:column;align-items:stretch;text-align:left}.res{grid-template-columns:1fr}h2{font-size:22px}.hero{padding:34px 0 22px}}
@media(max-width:400px){.logo span{font-size:14px}}