:root{
  --ink:#0E2433;
  --steel:#1B4A63;
  --muted:#5A6D7A;
  --line:#DFE5E9;
  --surface:#F5F8F9;
  --brand:#0A6B58;
  --brand-soft:#E6F2EF;
  --accent:#D98324;
  --white:#fff;
  --radius:6px;
  --max:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Inter","Helvetica Neue",Arial,"Leelawadee UI","Noto Sans Thai",Tahoma,sans-serif;
  color:var(--ink);background:var(--white);
  font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--brand);font-weight:600;margin-bottom:14px}
h1,h2,h3{font-weight:600;line-height:1.25;letter-spacing:-.01em}
h1{font-size:clamp(30px,4.2vw,46px)}
h2{font-size:clamp(24px,2.8vw,32px);margin-bottom:16px}
h3{font-size:18px;margin-bottom:8px}
p.lead{font-size:17px;color:var(--muted);max-width:62ch}
.mono{font-variant-numeric:tabular-nums}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:28px;height:66px}
.logo{display:flex;align-items:center;gap:9px;font-weight:700;font-size:17px;letter-spacing:.02em;white-space:nowrap}
.logo-mark{width:24px;height:24px;border-radius:3px;background:var(--brand);position:relative;flex:none}
.logo-mark::after{content:"";position:absolute;inset:5px 5px auto 5px;height:2px;background:#fff;box-shadow:0 5px 0 #fff,0 10px 0 #fff}
.logo span{color:var(--brand)}
.nav-links{display:flex;gap:24px;margin-left:auto;font-size:14px;color:var(--muted)}
.nav-links a:hover{color:var(--ink)}
.nav-cta{display:flex;align-items:center;gap:14px;margin-left:8px}
.lang{font-size:13px;color:var(--muted);border:1px solid var(--line);border-radius:4px;padding:4px 9px}
.lang:hover{border-color:var(--steel);color:var(--ink)}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--brand);color:#fff;padding:11px 20px;border-radius:var(--radius);font-size:14px;font-weight:600;border:1px solid var(--brand);cursor:pointer;transition:opacity .15s}
.btn:hover{opacity:.9}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--steel)}
@media(max-width:900px){.nav-links{display:none}}
/* narrow screens: the sticky bottom bar already carries WhatsApp, so drop the duplicate */
@media(max-width:600px){
  .nav-in{gap:12px}
  .nav-cta{gap:10px;margin-left:auto}
  .nav-cta .btn{display:none}
}

/* hero */
.hero{padding:64px 0 56px;border-bottom:1px solid var(--line)}
.hero-in{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero h1 span{color:var(--brand)}
.hero p.lead{margin:20px 0 28px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-img{position:relative}
.hero-img img{width:100%;height:430px;object-fit:cover;border-radius:var(--radius)}
.badge{position:absolute;left:-14px;bottom:-14px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:12px 16px;font-size:13px;line-height:1.4;box-shadow:0 1px 2px rgba(14,36,51,.06)}
.badge b{display:block;font-size:19px;color:var(--brand);font-variant-numeric:tabular-nums}
@media(max-width:900px){.hero-in{grid-template-columns:1fr;gap:32px}.hero-img img{height:300px}}

/* stats strip */
.stats{border-bottom:1px solid var(--line);background:var(--surface)}
.stats-in{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line)}
.stat{background:var(--surface);padding:26px 22px}
.stat b{display:block;font-size:26px;font-weight:600;color:var(--steel);font-variant-numeric:tabular-nums;line-height:1.2}
.stat small{font-size:13px;color:var(--muted);display:block;margin-top:4px}
@media(max-width:700px){.stats-in{grid-template-columns:repeat(2,1fr)}}

/* sections */
section{padding:72px 0}
section.tight{padding:56px 0}
section.alt{background:var(--surface)}
.sec-head{max-width:70ch;margin-bottom:40px}

/* compare table */
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
thead th{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:600;border-bottom:1px solid var(--steel)}
td.us{color:var(--ink);font-weight:500;background:var(--brand-soft)}
.thead-old,.old{color:var(--muted)}
.table-scroll{overflow-x:auto}

/* cards */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.g2,.g3,.g4{grid-template-columns:1fr}}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:#fff}
.card h3{font-size:16px}
.card p{font-size:14px;color:var(--muted)}
.card .num{font-size:12px;font-weight:600;color:var(--brand);letter-spacing:.1em;margin-bottom:10px;display:block}

/* steps */
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.step{border-top:2px solid var(--steel);padding-top:16px}
.step::before{counter-increment:s;content:counter(s);font-size:12px;font-weight:700;color:#fff;background:var(--steel);width:22px;height:22px;border-radius:50%;display:grid;place-items:center;margin-bottom:10px;font-variant-numeric:tabular-nums}
.step b{display:block;font-size:15px;margin-bottom:4px}
.step small{font-size:13px;color:var(--muted);line-height:1.5;display:block}
@media(max-width:900px){.steps{grid-template-columns:repeat(2,1fr)}}

/* specs */
.specs{display:grid;grid-template-columns:repeat(2,1fr);gap:0 48px}
.spec{display:flex;justify-content:space-between;gap:16px;padding:12px 0;border-bottom:1px solid var(--line);font-size:15px}
.spec dt{color:var(--muted)}
.spec dd{font-weight:500;text-align:right;font-variant-numeric:tabular-nums}
@media(max-width:700px){.specs{grid-template-columns:1fr}}

/* certs */
.cert{border-left:2px solid var(--brand);padding-left:16px}
.cert b{display:block;font-size:15px}
.cert small{color:var(--muted);font-size:13px}

/* cta band */
.band{background:var(--ink);color:#fff;padding:64px 0}
.band h2{color:#fff}
.band p{color:#B9C6CE;max-width:60ch;margin-bottom:26px}
.band .btn{background:var(--brand);border-color:var(--brand)}
.band .btn.ghost{color:#fff;border-color:rgba(255,255,255,.28);background:transparent}
.band-in{display:flex;align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap}

/* form */
form .row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
form .field{margin-bottom:16px}
label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}
input,select,textarea{width:100%;min-width:0;padding:11px 12px;border:1px solid var(--line);border-radius:4px;font-size:15px;font-family:inherit;color:var(--ink);background:#fff}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand)}
@media(max-width:640px){form .row{grid-template-columns:1fr;gap:0}}
.help{font-size:12px;color:var(--muted);margin-top:6px}

/* footer */
footer{background:var(--surface);border-top:1px solid var(--line);padding:56px 0 32px;font-size:14px}
.foot-in{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
footer h4{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:12px;font-weight:600}
footer ul{list-style:none;display:grid;gap:8px;color:var(--muted)}
footer a:hover{color:var(--ink)}
.foot-bottom{margin-top:40px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:13px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
@media(max-width:800px){.foot-in{grid-template-columns:1fr 1fr}}

/* calculator */
.calc{display:grid;grid-template-columns:380px 1fr;gap:32px;align-items:start}
.calc-panel{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:#fff}
.result{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.result-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.res b{display:block;font-size:30px;font-weight:600;color:var(--steel);font-variant-numeric:tabular-nums;line-height:1.1}
.res small{font-size:13px;color:var(--muted);display:block;margin-top:6px}
.note{font-size:12.5px;color:var(--muted);border-top:1px solid var(--line);margin-top:24px;padding-top:16px}
@media(max-width:900px){.calc{grid-template-columns:minmax(0,1fr)}}

/* thai line-height */
html[lang="th"] body{line-height:1.85}
html[lang="th"] h1,html[lang="th"] h2{line-height:1.4}

/* ============================================================
   Floating WhatsApp + mobile action bar (injected by site.js)
   ============================================================ */
.wa-fab{position:fixed;right:22px;bottom:22px;z-index:80}
.wa-fab .wa-btn{
  position:relative;display:inline-flex;align-items:center;gap:10px;
  background:#25D366;color:#fff;border-radius:999px;padding:13px 20px 13px 17px;
  font-size:14px;font-weight:600;box-shadow:0 6px 20px rgba(14,36,51,.2);
  transition:transform .15s ease,box-shadow .15s ease;
}
.wa-fab .wa-btn:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(14,36,51,.26)}
.wa-fab .wa-btn::after{
  content:"";position:absolute;inset:0;border-radius:999px;pointer-events:none;
  animation:waPulse 2.8s ease-out infinite;
}
@keyframes waPulse{
  0%{box-shadow:0 0 0 0 rgba(37,211,102,.5)}
  70%{box-shadow:0 0 0 16px rgba(37,211,102,0)}
  100%{box-shadow:0 0 0 0 rgba(37,211,102,0)}
}
.wa-btn svg{width:21px;height:21px;flex:none;fill:#fff}
.wa-btn .wa-txt{white-space:nowrap}
@media(prefers-reduced-motion:reduce){.wa-fab .wa-btn::after{animation:none}}

/* mobile bottom bar */
.mbar{display:none}
@media(max-width:780px){
  .wa-fab{display:none}
  .mbar{
    display:grid;grid-template-columns:1.15fr 1fr;gap:1px;
    position:fixed;left:0;right:0;bottom:0;z-index:85;
    background:var(--line);border-top:1px solid var(--line);
    padding-bottom:env(safe-area-inset-bottom);
  }
  .mbar a{display:flex;align-items:center;justify-content:center;gap:8px;padding:14px 8px;font-size:14px;font-weight:600;background:#fff;color:var(--ink)}
  .mbar a.m-wa{background:#25D366;color:#fff}
  .mbar svg{width:18px;height:18px;fill:currentColor;flex:none}
  body{padding-bottom:52px}
}

/* ============================================================
   Contact page layout + enquiry form states
   ============================================================ */
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:start}
@media(max-width:900px){.contact-grid{grid-template-columns:1fr;gap:36px}}

.submit-row{display:grid;grid-template-columns:1.15fr 1fr;gap:12px;margin-top:6px}
.btn-wa{background:#25D366;border-color:#25D366;color:#fff;justify-content:center}
.btn-wa:hover{opacity:.92}
.btn-wa svg{width:18px;height:18px;fill:#fff;flex:none}
.btn.btn-email{justify-content:center}
@media(max-width:520px){.submit-row{grid-template-columns:1fr}}
.btn[disabled]{opacity:.55;cursor:default}

.form-msg{display:none;margin-top:20px;border-radius:var(--radius);padding:16px 18px;font-size:14px;line-height:1.6}
.form-msg.show{display:block}
.form-msg.ok{background:var(--brand-soft);border:1px solid #BFDED6;color:#0A5445}
.form-msg.err{background:#FDF2E8;border:1px solid #F1D7BD;color:#8A4A10}
.form-msg b{display:block;margin-bottom:5px;font-size:15px}
.form-msg .btn{margin-top:13px}
.form-msg a{text-decoration:underline;text-underline-offset:2px}

/* direct-contact rows */
.contact-line{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:13px 0;border-bottom:1px solid var(--line);flex-wrap:wrap}
.contact-line:last-of-type{border-bottom:none}
.contact-line .cl-k{font-size:12.5px;color:var(--muted);letter-spacing:.02em}
.contact-line .cl-v{font-weight:600;font-size:15px;line-height:1.5;word-break:break-word}
.contact-line .cl-v a:hover{color:var(--brand)}
.copy{display:inline-flex;align-items:center;gap:5px;font-size:11.5px;font-family:inherit;color:var(--muted);background:#fff;border:1px solid var(--line);border-radius:4px;padding:3px 8px;cursor:pointer;transition:all .15s}
.copy:hover{border-color:var(--brand);color:var(--brand)}
.copy.done{border-color:var(--brand);color:var(--brand);background:var(--brand-soft)}
.contact-note{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;font-size:13.5px;color:var(--muted);line-height:1.7;margin-top:18px}
.contact-note b{color:var(--ink)}

/* QR + save-contact card under the form */
.qr-card{display:flex;gap:20px;align-items:center;flex-wrap:wrap;margin-top:20px}
.enq-col{min-width:0}
.qr-card img{flex:none;border:1px solid var(--line);border-radius:4px;background:#fff}
.qr-card > div{flex:1;min-width:200px}
.btn-sm{padding:8px 15px;font-size:13px;margin-top:10px}
@media(max-width:420px){.qr-card img{width:92px;height:92px}}

/* never let the floating entries end up in a printed PDF */
@media print{
  .wa-fab,.mbar,.nav,.toolbar{display:none!important}
  body{padding-bottom:0!important}
}

/* project references strip (homepage) */
.ref-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:0 0 28px}
.ref-grid figure{margin:0;position:relative;border-radius:var(--radius);overflow:hidden;background:#E9EEF1}
.ref-grid img{display:block;width:100%;height:190px;object-fit:cover;transition:transform .5s ease}
.ref-grid figure:hover img{transform:scale(1.05)}
.ref-cap{position:absolute;left:0;right:0;bottom:0;padding:26px 12px 10px;color:#fff;font-size:12px;line-height:1.35;
  background:linear-gradient(to top,rgba(10,25,35,.86),rgba(10,25,35,0))}
.ref-cap b{display:block;font-size:13px;font-weight:600;margin-bottom:2px}
@media(max-width:900px){.ref-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.ref-grid{grid-template-columns:1fr}.ref-grid img{height:210px}}

/* 导航加到 6 项后，900-1080px 区间收窄间距防溢出 */
@media(min-width:901px) and (max-width:1080px){
  .nav-in{gap:16px}
  .nav-links{gap:15px;font-size:13px}
  .nav-cta{gap:10px}
  .btn{padding:10px 14px;font-size:13px}
}