:root{--navy:#052d58;--blue:#087cbc;--cyan:#18b7d5;--ice:#eff9fd;--ink:#17364f;--muted:#678093;--line:#cfe5ef;--white:#fff;--gold:#f7b735}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#f6fbfd;color:var(--ink);font-family:"Noto Sans Thai",Tahoma,sans-serif;line-height:1.8}a{color:inherit}.skip-link{position:fixed;top:-70px;left:14px;z-index:100;padding:9px 15px;background:var(--navy);color:#fff;border-radius:8px}.skip-link:focus{top:12px}.topbar{max-width:1200px;height:76px;margin:auto;padding:0 22px;display:flex;align-items:center;justify-content:space-between}.topbar img{display:block;height:42px;width:auto}.topbar span{font-size:.8rem;font-weight:900;color:var(--blue);border-bottom:2px solid var(--cyan)}.hero{position:relative;min-height:610px;background:linear-gradient(118deg,#0476ae 0 45%,#eaf8fc 45%);display:grid;grid-template-columns:1.05fr .95fr;align-items:center;overflow:hidden}.hero:before{content:"";position:absolute;width:460px;height:460px;border:90px solid rgba(255,255,255,.07);border-radius:50%;left:-150px;top:-180px}.hero-image{padding:50px 0 50px max(24px,calc((100vw - 1180px)/2));position:relative}.hero-image img{display:block;width:100%;max-width:620px;height:auto;border:10px solid rgba(255,255,255,.16);border-radius:0 70px 0 70px;box-shadow:0 26px 60px rgba(2,40,72,.28)}.hero-copy{padding:60px max(24px,calc((100vw - 1180px)/2)) 60px 65px}.eyebrow{margin:0;color:var(--blue);font-weight:900;letter-spacing:.15em}.hero h1{font-size:clamp(2.4rem,4.3vw,4.5rem);line-height:1.15;color:var(--navy);margin:13px 0 20px}.hero-copy>p:last-of-type{color:var(--muted);font-size:1.08rem}.hero-badges{display:flex;flex-wrap:wrap;gap:9px;margin-top:24px}.hero-badges span{padding:7px 15px;border-radius:4px;background:#fff;border-left:4px solid var(--cyan);font-weight:900;color:var(--blue);box-shadow:0 6px 18px rgba(3,79,120,.1)}.chapter-nav{max-width:1160px;margin:-32px auto 0;position:relative;z-index:2;background:#fff;border-radius:16px;box-shadow:0 17px 42px rgba(4,67,107,.15);padding:28px 32px;display:grid;grid-template-columns:170px 1fr;gap:28px}.chapter-title{display:flex;flex-direction:column;border-right:1px solid var(--line)}.chapter-title small{color:var(--cyan);font-weight:900;letter-spacing:.14em}.chapter-title strong{color:var(--navy);font-size:1.3rem}.chapter-nav ul{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,1fr);gap:8px 20px}.chapter-nav a{display:grid;grid-template-columns:28px 1fr;gap:6px;text-decoration:none;font-size:.82rem;line-height:1.45;padding:6px 0;border-bottom:1px dashed var(--line)}.chapter-nav b{color:var(--cyan)}.chapter-nav a:hover{color:var(--blue)}.article{max-width:960px;margin:58px auto 84px;padding:0 25px}.article section.level2{position:relative;margin:32px 0;padding:38px 44px;background:#fff;border:1px solid var(--line);border-radius:6px 28px 6px 28px;box-shadow:0 10px 30px rgba(7,75,112,.06)}.article section.level2:before{content:"";position:absolute;left:-1px;top:35px;width:6px;height:70px;background:linear-gradient(var(--cyan),var(--blue));border-radius:0 5px 5px 0}.article section.level2:nth-of-type(even){background:#f0faff}.article h2{font-size:clamp(1.7rem,3vw,2.4rem);line-height:1.35;color:var(--navy);margin:0 0 20px}.article h3{font-size:1.28rem;line-height:1.45;color:var(--blue);margin:1.4em 0 .35em}.article p{margin:.65em 0}.article ul{padding-left:1.35em}.article li{margin:.45em 0}.article li::marker{color:var(--cyan)}.article-visual{margin:36px 0}.article-visual img{display:block;width:100%;height:auto;border-radius:6px 38px 6px 38px;box-shadow:0 15px 34px rgba(3,62,100,.17)}figcaption{text-align:center;color:var(--muted);font-size:.88rem;margin-top:8px}.primary-action{text-align:center;margin:28px 0}.primary-action img{display:inline-block;width:min(285px,80%);height:auto;filter:drop-shadow(0 11px 18px rgba(4,98,160,.25));transition:.2s}.primary-action img:hover{transform:translateY(-4px)}.faq-panel{margin:42px 0;padding:38px 44px;background:linear-gradient(135deg,#dff5fc,#f9fdff);border:1px solid #aedaea;border-radius:6px 28px 6px 28px}.faq-panel h2{margin-top:0}.faq-list{display:grid;gap:10px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:8px;overflow:hidden}.faq-item summary{cursor:pointer;padding:16px 18px;font-weight:900;color:var(--navy);list-style:none}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary:after{content:"+";float:right;color:var(--cyan);font-size:1.35rem}.faq-item[open] summary:after{content:"−"}.faq-item[open] summary{background:#e9f8fd}.faq-answer{padding:0 18px 16px}footer{background:#032849;color:#d9e9f2;padding:52px 22px 18px;border-top:7px solid var(--cyan)}.footer-inner{max-width:1030px;margin:auto;display:grid;grid-template-columns:1.1fr .9fr;gap:70px}.footer-about img{height:46px;width:auto;filter:brightness(0) invert(1)}.footer-about p{max-width:490px;color:#9cb7c8}.footer-inner h2{font-size:1.18rem;color:#65dbea;margin:0 0 12px}.contact-list{list-style:none;margin:0;padding:0}.contact-list li{display:grid;grid-template-columns:90px 1fr;padding:7px 0;border-bottom:1px solid rgba(255,255,255,.1)}.contact-list span{color:#8fadc0}.contact-list a{text-decoration:none}.copyright{max-width:1030px;margin:34px auto 0;padding-top:17px;text-align:center;border-top:1px solid rgba(255,255,255,.12);font-size:.86rem;color:#8da8ba}.back-top{position:fixed;right:20px;bottom:20px;width:46px;height:46px;border:0;border-radius:5px;background:var(--cyan);color:var(--navy);font-size:21px;font-weight:900;box-shadow:0 8px 22px rgba(3,54,86,.25);opacity:0;transform:translateY(12px);pointer-events:none;transition:.2s}.back-top.show{opacity:1;transform:none;pointer-events:auto}@media(max-width:900px){.hero{grid-template-columns:1fr;background:linear-gradient(155deg,#0476ae 0 43%,#eaf8fc 43%)}.hero-image{padding:35px 24px 0}.hero-copy{padding:38px 28px 70px}.chapter-nav{margin:-25px 14px 0;grid-template-columns:1fr}.chapter-title{border-right:0;border-bottom:1px solid var(--line);padding-bottom:12px}.chapter-nav ul{grid-template-columns:1fr 1fr}.footer-inner{grid-template-columns:1fr;gap:30px}}@media(max-width:620px){.topbar{height:64px;padding:0 15px}.topbar img{height:34px}.topbar span{font-size:.68rem}.hero h1{font-size:2.15rem}.hero-image img{border-radius:0 35px 0 35px}.chapter-nav{padding:23px 18px}.chapter-nav ul{grid-template-columns:1fr}.article{padding:0 10px;margin-top:35px}.article section.level2,.faq-panel{padding:25px 19px;margin:28px 0}.article h2{font-size:1.6rem}.footer-inner{gap:24px}.contact-list li{grid-template-columns:78px 1fr}}