:root{--navy:#0F2D63;--blue:#1E5BC6;--blue-2:#3B7BE0;--sky:#EEF4FF;--sky-2:#DCE8FF;--gold:#F2B233;--gold-d:#D9970F;--gold-l:#FFF4DA;--white:#fff;--ink:#16213D;--muted:#55627F;--line:#E1E8F5;--line-g:#06C755;--r:16px;--sh:0 8px 28px rgba(15,45,99,.10);--max:1200px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:Sarabun,system-ui,-apple-system,"Segoe UI",sans-serif;font-size:17px;line-height:1.75;color:var(--ink);background:#fff}
h1,h2,h3,h4,.brand,.btn,.chip,.tab{font-family:Prompt,Sarabun,sans-serif}
h1,h2,h3{color:var(--navy);line-height:1.35}
h1{font-size:clamp(28px,4.6vw,44px);font-weight:700;letter-spacing:-.01em;margin:12px 0 18px}
h2{font-size:clamp(22px,3vw,30px);font-weight:700}
h3{font-size:19px;font-weight:600;margin:20px 0 6px}
a{color:var(--blue)}
img{max-width:100%;display:block;height:auto}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;z-index:99;background:#fff;padding:8px 12px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy);font-weight:700;font-size:18px;line-height:1.15}
.brand img{width:44px;height:44px;border-radius:12px;object-fit:contain;background:#fff}
.brand small{display:block;font-size:12px;font-weight:500;color:var(--gold-d)}
.brand.light{color:#fff}.brand.light small{color:var(--gold)}
.menu{display:flex;align-items:center;gap:24px;list-style:none}
.menu a{text-decoration:none;color:var(--muted);font-weight:600;font-family:Prompt,sans-serif;font-size:15px}
.menu a:hover{color:var(--blue)}
.nav-toggle{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer}
.nav-toggle span{display:block;height:2px;background:var(--navy);margin:6px 8px;border-radius:2px}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 24px;border-radius:999px;font-weight:600;font-size:16px;text-decoration:none;border:2px solid transparent;transition:transform .15s,box-shadow .15s,background .15s;cursor:pointer}
.btn:hover{transform:translateY(-2px);box-shadow:var(--sh)}
.btn-gold{background:var(--gold);color:var(--navy)!important}.btn-gold:hover{background:#F7C04F}
.btn-outline{border-color:var(--blue);color:var(--blue)}
.btn-line{background:var(--line-g);color:#fff}
.btn-sm{padding:8px 16px;font-size:14px}
.btn-block{display:flex;width:100%;margin-top:14px}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0}
.chip{display:inline-block;background:var(--gold-l);color:var(--gold-d);font-weight:600;font-size:13px;padding:5px 14px;border-radius:999px}
/* hero */
.home-hero{background:linear-gradient(160deg,var(--sky) 0%,#fff 70%);padding:36px 0 20px}
.crumbs{padding:16px 20px 0}.crumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;font-size:14px;color:var(--muted)}
.crumbs li+li:before{content:"/";margin-right:6px;color:#9AA6C0}.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--blue)}
.hero-grid{display:grid;grid-template-columns:7fr 5fr;gap:40px;align-items:start;padding-top:20px;padding-bottom:20px}
.lead{font-size:18px;color:var(--muted)}
.answer-box{background:var(--sky);border-left:5px solid var(--gold);border-radius:12px;padding:18px 22px;margin:18px 0;font-size:18px;color:var(--navy)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;list-style:none;margin-top:8px}
.stats li{background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px;text-align:center;box-shadow:0 2px 10px rgba(15,45,99,.05)}
.stats b{display:block;font-family:Prompt,sans-serif;color:var(--blue);font-size:18px}.stats span{font-size:13px;color:var(--muted)}
.sticky{position:sticky;top:92px}
.fig{margin:18px 0}
.fig img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r);border:1px solid var(--line);transition:transform .4s}
.fig a{display:block;overflow:hidden;border-radius:var(--r)}
.fig a:hover img{transform:scale(1.04)}
.fig figcaption{font-size:14px;color:var(--muted);margin-top:6px}
.hero-img{margin-top:0}.hero-img img{aspect-ratio:1/1;box-shadow:var(--sh)}
/* prose */
.prose{margin-top:24px}.prose h2{margin-top:10px}.prose p{margin:8px 0;color:#2E3A59}
.ticks{list-style:none;margin:10px 0}.ticks li{position:relative;padding-left:30px;margin:6px 0}
.ticks li:before{content:"✓";position:absolute;left:0;top:2px;width:22px;height:22px;border-radius:50%;background:var(--gold-l);color:var(--gold-d);font-weight:700;font-size:13px;display:grid;place-items:center}
/* calc */
.calc{background:var(--sky);border:1px solid var(--sky-2);border-radius:20px;padding:24px;margin-top:20px}
.calc-h{font-size:21px;margin-bottom:12px}
.calc label{font-weight:600;font-size:15px;color:var(--muted)}
.calc-in{width:100%;margin-top:6px;padding:12px 14px;font-size:18px;border:2px solid var(--line);border-radius:12px;font-family:inherit}
.calc-in:focus{outline:none;border-color:var(--blue)}
.calc-out{display:flex;justify-content:space-between;align-items:center;background:#fff;border-radius:12px;padding:14px 16px;margin:12px 0;border:1px solid var(--line)}
.calc-out strong{font-family:Prompt,sans-serif;font-size:24px;color:var(--navy)}
.calc-note{font-size:13.5px;color:var(--muted);font-style:italic;margin-top:8px}
.tiers{list-style:none;margin-top:12px}.tiers li{display:flex;justify-content:space-between;gap:10px;padding:9px 12px;background:rgba(255,255,255,.65);border:1px solid var(--line);border-radius:10px;margin-top:6px;font-size:15px}
.tiers b{color:var(--blue);white-space:nowrap}
/* sections */
.sec{padding-top:64px}
.sec-h{margin-bottom:22px;padding-bottom:12px;border-bottom:2px solid var(--line);position:relative}
.sec-h:after{content:"";position:absolute;left:0;bottom:-2px;width:72px;height:2px;background:var(--gold)}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.two-col.rev>.fig{order:-1}
.fig-stack .fig:first-child{margin-top:0}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.step{position:relative;background:#fff;border:1px solid var(--line);border-radius:20px;padding:16px;box-shadow:0 4px 18px rgba(15,45,99,.06)}
.step .fig{margin:0 0 6px}
.step h3{margin-top:8px;font-size:17px}.step p{font-size:15px;color:var(--muted)}
.step-no{position:absolute;z-index:2;top:8px;left:8px;width:36px;height:36px;border-radius:50%;background:var(--gold);color:var(--navy);font-family:Prompt;font-weight:700;display:grid;place-items:center;box-shadow:0 3px 8px rgba(0,0,0,.15)}
.tbl-wrap{overflow-x:auto}
.spec{width:100%;border-collapse:collapse;font-size:15.5px;border-radius:14px;overflow:hidden;border:1px solid var(--line)}
.spec caption{text-align:left;font-size:14px;color:var(--muted);margin-bottom:8px}
.spec th,.spec td{padding:11px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.spec th[scope=row]{background:var(--sky);color:var(--navy);width:38%;font-weight:600}
.spec thead th{background:var(--navy);color:#fff}
.price td:nth-child(2){font-weight:700;color:var(--blue)}
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.gallery .fig{margin:0}
/* faq */
.faq-group{margin:26px 0 10px;font-size:18px;color:var(--blue)}
.acc{border:1px solid var(--line);border-radius:14px;margin-bottom:10px;background:#fff;overflow:hidden}
.acc-h{margin:0;font-size:inherit}
.acc-h button{width:100%;display:flex;justify-content:space-between;align-items:center;gap:14px;text-align:left;background:none;border:0;padding:16px 20px;font:600 16.5px/1.5 Prompt,Sarabun,sans-serif;color:var(--navy);cursor:pointer}
.acc-h button:hover{background:var(--sky)}
.chev{flex:none;width:26px;height:26px;border-radius:50%;background:var(--gold-l);position:relative;transition:transform .25s}
.chev:before{content:"";position:absolute;left:8px;top:7px;width:8px;height:8px;border-right:2px solid var(--gold-d);border-bottom:2px solid var(--gold-d);transform:rotate(45deg)}
.acc.open .chev{transform:rotate(180deg)}
.acc-b{max-height:0;overflow:hidden;transition:max-height .3s ease}
.acc-b p{padding:0 20px 18px;color:#2E3A59}
.acc.open .acc-b{max-height:700px}
/* cta */
.cta-band{margin-top:72px}
.cta-inner{background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;border-radius:28px;padding:48px 40px;position:relative;overflow:hidden}
.cta-inner:after{content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;border-radius:50%;background:var(--gold);opacity:.18}
.cta-inner h2{color:#fff;position:relative}.cta-inner p{opacity:.92;max-width:680px;margin-top:10px;position:relative}
.cta-inner .btn-row{position:relative}
/* related */
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.rel{position:relative;display:block;padding:20px;border:1px solid var(--line);border-radius:18px;text-decoration:none;background:#fff;transition:background .2s,transform .2s}
.rel:hover{background:var(--sky);transform:translateY(-3px)}
.rel-cat{font-size:12.5px;color:var(--gold-d);font-weight:600}
.rel h3{margin:4px 0;font-size:17px}.rel p{font-size:14.5px;color:var(--muted);padding-right:24px}
.arrow{position:absolute;right:18px;bottom:16px;color:var(--blue);font-weight:700}
.back{margin-top:20px}
/* home finder / toc */
.toc{margin-top:40px;background:var(--sky);border-radius:22px;padding:28px}
.toc .sec-h{margin-bottom:14px}
.toc-list{columns:2;gap:30px;padding-left:22px}.toc-list li{margin:4px 0}
.toc-more{margin-top:14px}
.art-list{columns:2;gap:28px;padding-left:24px;font-size:15.5px}.art-list li{margin:4px 0;break-inside:avoid}
.ans-lg{font-size:18px}
@media (max-width:760px){.art-list{columns:1}}
.toc-all{margin-top:14px}.toc-all summary{cursor:pointer;font-weight:600;color:var(--blue);font-family:Prompt}
.toc-pages{columns:3;gap:24px;padding-left:22px;margin-top:10px;font-size:15px}
.finder{display:flex;flex-direction:column;gap:14px;margin-bottom:10px}
#svc-search{width:100%;padding:14px 18px;font-size:17px;border:2px solid var(--line);border-radius:999px;font-family:inherit}
#svc-search:focus{outline:none;border-color:var(--blue)}
.tabs{display:flex;flex-wrap:wrap;gap:8px}
.tab{border:1.5px solid var(--line);background:#fff;color:var(--muted);padding:7px 16px;border-radius:999px;font-size:14.5px;cursor:pointer;font-weight:600}
.tab.active,.tab:hover{background:var(--navy);border-color:var(--navy);color:#fff}
.svc-group h3{margin-top:26px}
.svc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin-top:10px}
.svc{display:flex;flex-direction:column;gap:2px;padding:16px;border:1px solid var(--line);border-radius:16px;text-decoration:none;background:#fff;transition:all .2s}
.svc:hover{border-color:var(--gold);box-shadow:var(--sh);transform:translateY(-3px)}
.svc-ico{width:36px;height:36px;border-radius:50%;background:var(--gold-l);display:grid;place-items:center;margin-bottom:6px}
.svc-t{font-family:Prompt;font-weight:600;color:var(--navy)}.svc-p{font-size:14px;color:var(--blue)}
.no-res{margin-top:16px;color:var(--muted)}
/* footer */
.site-footer{margin-top:80px;background:var(--navy);color:#C9D6F0;padding:56px 0 90px}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px}
.foot-brand p{margin-top:12px;font-size:15px}
.foot-contact a{color:var(--gold);font-weight:600;text-decoration:none}
.foot-h{color:#fff;font-size:16px;margin-bottom:10px}
.site-footer ul{list-style:none}.site-footer li{margin:5px 0}
.site-footer nav a{color:#C9D6F0;text-decoration:none;font-size:15px}.site-footer nav a:hover{color:var(--gold)}
.copy{text-align:center;font-size:13.5px;margin-top:36px;opacity:.75}
.float-cta{position:fixed;right:16px;bottom:16px;z-index:60;display:flex;flex-direction:column;gap:10px}
.float-cta a{display:grid;place-items:center;width:62px;height:62px;border-radius:50%;color:#fff;text-decoration:none;font:700 13px Prompt,sans-serif;box-shadow:0 6px 18px rgba(0,0,0,.2)}
.fc-tel{background:var(--blue)}.fc-line{background:var(--line-g)}
/* reveal */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s,transform .6s}.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}.reveal{opacity:1;transform:none}}
/* responsive */
@media (max-width:980px){
 .hero-grid,.two-col{grid-template-columns:1fr;gap:20px}
 .two-col.rev>.fig{order:0}
 .sticky{position:static}
 .steps,.gallery{grid-template-columns:repeat(2,1fr)}
 .rel-grid{grid-template-columns:repeat(2,1fr)}
 .foot-grid{grid-template-columns:1fr 1fr}.foot-brand{grid-column:1/-1}
 .toc-pages{columns:2}
}
@media (max-width:760px){
 body{font-size:16px}
 .nav-toggle{display:block}
 .menu{display:none;position:absolute;top:72px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:#fff;border-bottom:1px solid var(--line);padding:8px 20px 16px;box-shadow:var(--sh)}
 .menu.open{display:flex}.menu li a{display:block;padding:12px 0}.menu .btn{margin-top:8px}
 .stats{grid-template-columns:repeat(2,1fr)}
 .toc-list,.toc-pages{columns:1}
 .rel-grid{grid-template-columns:1fr}
 .cta-inner{padding:34px 22px}
 .btn-row .btn{flex:1 1 100%}
}
@media (max-width:420px){.steps,.gallery{grid-template-columns:1fr 1fr;gap:10px}.step{padding:10px}.brand{font-size:16px}}
.hero-band{background:radial-gradient(circle at 75% 25%,#E3EDFF 0%,#F8FAFF 55%,#fff 100%);padding:24px 0 10px}
.hero-band.home{padding-top:40px}
.hero-side .contact-card{margin-top:18px}
.contact-card{background:#fff;border:1px solid var(--line);border-left:5px solid var(--gold);border-radius:20px;padding:20px;box-shadow:var(--sh)}
.cc-title{font:700 17px Prompt,sans-serif;color:var(--navy)}.cc-name{font:700 24px Prompt,sans-serif;color:var(--gold-d);margin:2px 0 6px}
.cc-ticks{margin:4px 0 6px;font-size:15px}.cc-note{font-size:13px;color:var(--muted);margin-top:10px}
.contact-card .btn-block{margin-top:10px}
.sec-h.center{text-align:center}.sec-h.center:after{left:50%;transform:translateX(-50%)}
.sec-sub{text-align:center;color:var(--muted);margin:-8px auto 22px;max-width:760px}
.gal-cta{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:22px}
.work-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.work-card{margin:0;border-radius:18px;overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:0 3px 12px rgba(15,45,99,.06)}
.work-card img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .4s}
.work-card a:hover img{transform:scale(1.05)}
.work-grid .work-card:nth-child(1),.work-grid .work-card:nth-child(8){grid-column:span 2;grid-row:span 2}
.work-grid .work-card:nth-child(1) img,.work-grid .work-card:nth-child(8) img{height:100%;aspect-ratio:auto}
.bento-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.bento-grid.five{grid-template-columns:repeat(5,1fr)}
.bento{background:rgba(255,255,255,.85);border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:24px;padding:14px;box-shadow:0 4px 18px rgba(15,45,99,.06)}
.bento .fig{margin:0 0 10px}.bento h3{font-size:17px;margin-top:4px}.bento p{font-size:14.5px;color:var(--muted)}
.cmp-h{text-align:center;margin:34px 0 12px}
.cmp thead th{background:var(--navy);color:#fff}.cmp td:nth-child(2){background:#F2F8FF;font-weight:600;color:var(--navy)}
.steps3{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;position:relative}
.step3{position:relative;text-align:center}
.step3:not(:last-child):after{content:"";position:absolute;top:28px;left:calc(50% + 34px);width:calc(100% - 28px);border-top:2px dashed var(--blue);z-index:0}
.step3 .step-no{position:relative;top:auto;left:auto;margin:0 auto 12px;width:56px;height:56px;font-size:20px;z-index:1;display:grid}
.step3 h3{font-size:18px}.step3 p{font-size:15px;color:var(--muted)}
.cta-banner{margin-top:72px}.cta-banner .cta-inner{border-radius:40px;padding:56px 48px}
/* ---- click-to-build effect ---- */
a.bfx{position:relative;display:block;overflow:hidden;cursor:pointer}
a.bfx.building img{animation:kd-build 1.25s steps(7,end) both}
a.bfx.building::before{content:"";position:absolute;inset:0;z-index:2;pointer-events:none;
  background:repeating-linear-gradient(0deg,transparent 0 24px,rgba(242,178,51,.65) 24px 28px),repeating-linear-gradient(90deg,transparent 0 52px,rgba(15,45,99,.45) 52px 56px);
  animation:kd-scaffold 1.25s ease both}
a.bfx.building::after{content:"🏗️";position:absolute;top:8px;left:-48px;font-size:38px;z-index:3;pointer-events:none;filter:drop-shadow(0 2px 3px rgba(0,0,0,.3));animation:kd-crane 1.25s ease-in-out both}
@keyframes kd-build{0%{clip-path:inset(100% 0 0 0);filter:grayscale(1) contrast(.8)}75%{clip-path:inset(0 0 0 0);filter:grayscale(.5)}100%{clip-path:inset(0);filter:none}}
@keyframes kd-scaffold{0%{opacity:1;transform:translateY(100%)}45%{transform:translateY(0)}80%{opacity:.85}100%{opacity:0}}
@keyframes kd-crane{0%{left:-48px;transform:rotate(-6deg)}50%{transform:rotate(4deg)}100%{left:calc(100% - 20px);transform:rotate(0)}}
@media (prefers-reduced-motion:reduce){a.bfx.building img,a.bfx.building::before,a.bfx.building::after{animation:none}}
@media (max-width:980px){.work-grid{grid-template-columns:repeat(3,1fr)}.bento-grid,.bento-grid.five{grid-template-columns:repeat(2,1fr)}.steps3{grid-template-columns:1fr;gap:24px}.step3:after{display:none}}
@media (max-width:560px){.work-grid{grid-template-columns:repeat(2,1fr);gap:10px}.work-grid .work-card:nth-child(8){grid-column:auto;grid-row:auto}.bento-grid,.bento-grid.five{grid-template-columns:1fr}.cta-banner .cta-inner{padding:34px 22px;border-radius:28px}}