/* hotdipcch.com — ชุบสังกะสีแบบจุ่มร้อน
   สี: เหล็ก (ink) / สังกะสี (zinc) / สังกะสีหลอมเหลว (molten = แดงตราจระเข้) */
:root{
  --ink:#16222a; --ink-2:#24343e;
  --zinc-050:#f3f5f6; --zinc-100:#e5e9eb; --zinc-300:#c2cad0; --zinc-600:#56646d;
  --molten:#c93a24; --molten-hot:#e2552f;
  --display:"Chakra Petch", "IBM Plex Sans Thai", "Sarabun", system-ui, sans-serif;
  --body:"IBM Plex Sans Thai", "Sarabun", "Noto Sans Thai", system-ui, sans-serif;
  --wrap:1180px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--body);font-size:17px;line-height:1.75;color:var(--ink);background:#fff}
img{max-width:100%;height:auto;display:block}
a{color:var(--molten)}
a:hover{color:var(--ink)}
:focus-visible{outline:3px solid var(--molten-hot);outline-offset:2px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:8px 12px;z-index:10}
.skip:focus{left:8px}
h1,h2,h3{font-family:var(--display);line-height:1.3;margin:0 0 .6em;font-weight:600}
h1{font-size:clamp(30px,4.2vw,48px)}
h2{font-size:clamp(22px,2.4vw,28px);margin-top:1.8em}
h3{font-size:20px;margin-top:1.4em}
p{margin:0 0 1em}

/* header */
.top{background:#fff;border-bottom:1px solid var(--zinc-100);position:sticky;top:0;z-index:5}
.top-in{display:flex;align-items:center;gap:24px;min-height:72px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-family:var(--display);font-weight:600;line-height:1.2}
.brand img{width:120px;height:auto}
.brand small{font-family:var(--body);font-weight:400;color:var(--zinc-600);font-size:13px}
#nav{margin-left:auto}
#nav ul{display:flex;gap:4px;list-style:none;margin:0;padding:0}
#nav a{display:block;padding:8px 12px;text-decoration:none;color:var(--ink);font-family:var(--display);font-weight:500}
#nav a:hover{color:var(--molten)}
#nav a[aria-current]{color:var(--molten);box-shadow:inset 0 -3px 0 var(--molten)}
.top-call{font-family:var(--display);font-weight:600;text-decoration:none;color:#fff;background:var(--molten);padding:9px 14px;border-radius:3px;white-space:nowrap}
.top-call:hover{background:var(--ink);color:#fff}
.menu-btn{display:none;margin-left:auto;font:600 15px var(--display);background:none;border:1px solid var(--zinc-300);border-radius:3px;padding:7px 14px;color:var(--ink)}

/* hero */
.hero{background:var(--ink);color:#fff;padding:56px 0 0}
.hero-in{display:grid;grid-template-columns:1fr 1.05fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(34px,5vw,58px);margin-bottom:.4em}
.hero h1 span{display:block;font-size:.5em;font-weight:500;color:var(--zinc-300);letter-spacing:.02em;margin-top:.3em}
.hero-text p{color:#d6dde1;max-width:34em}
.hero-cta{margin-top:1.6em}
.btn{display:inline-block;font-family:var(--display);font-weight:600;text-decoration:none;background:var(--molten);color:#fff;padding:12px 20px;border-radius:3px;margin:0 8px 8px 0}
.btn:hover{background:var(--molten-hot);color:#fff}
.btn.ghost{background:transparent;color:inherit;box-shadow:inset 0 0 0 1.5px currentColor}
.btn.ghost:hover{color:var(--molten-hot);background:transparent}
.hero-fig{margin:0}
.hero-fig figcaption{font-size:14px;color:var(--zinc-300);margin-top:8px}
.hero-fig figcaption a{color:#fff}

/* the bath drawing — the one bold element */
.bath{width:100%;height:auto;font-family:var(--display)}
.bath .rim{fill:#3a4c57;stroke:#8795a0;stroke-width:1.5}
.bath .front{fill:#2c3b45;stroke:#8795a0;stroke-width:1.5}
.bath .side{fill:#23313a;stroke:#8795a0;stroke-width:1.5}
.bath .surface{fill:none;stroke:#fff;stroke-opacity:.55;stroke-width:1.5}
.bath .dim line{stroke:var(--molten-hot);stroke-width:2}
.bath .dim line.thin{stroke-width:1.2;stroke-dasharray:4 3}
.bath .dim text{fill:#fff;font-size:17px;font-weight:600}
.svg-fig{background:var(--ink);padding:24px 24px 12px;border-radius:4px;margin:1.5em 0}

.specs{margin-top:48px}
.specs dl{display:grid;grid-template-columns:repeat(4,1fr);margin:0;border-top:1px solid #3b4b55}
.specs div{padding:20px 20px 24px 0}
.specs div+div{padding-left:20px;border-left:1px solid #3b4b55}
.specs dt{font-size:14px;color:var(--zinc-300)}
.specs dd{margin:4px 0 0;font:600 22px var(--display)}

/* sections */
.band{padding:72px 0}
.band-grey{background:var(--zinc-050)}
.sec{margin-top:0}
.works{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.works figure{margin:0}
.works img{aspect-ratio:4/3;object-fit:cover;width:100%;border-radius:3px}
.works figcaption{font:600 18px var(--display);margin-top:8px}
.more{margin-top:24px}
.two{display:grid;grid-template-columns:1fr 1.3fr;gap:48px;align-items:start}
.article-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--zinc-300)}
.article-list li{border-bottom:1px solid var(--zinc-300)}
.article-list a{display:block;padding:16px 0;text-decoration:none;color:var(--ink)}
.article-list strong{display:block;font-family:var(--display);font-weight:600;font-size:19px}
.article-list span{color:var(--zinc-600);font-size:15px}
.article-list a:hover strong{color:var(--molten)}
.article-list.wide{margin-top:24px}
.about-teaser img{border-radius:3px}

.band-contact{background:var(--molten);color:#fff;padding:48px 0}
.contact-row{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.band-contact h2{margin-top:0}
.band-contact a{color:#fff}
.plain{list-style:none;margin:0 0 1em;padding:0}
.plain span{display:inline-block;min-width:6.5em;opacity:.8}
.call-list li{padding:4px 0}
.call-list .big{font:600 20px var(--display);text-decoration:none}
.call-list .big:hover{text-decoration:underline}

.line-box{display:flex;align-items:center;gap:16px;margin:16px 0 24px;flex-wrap:wrap}
.line-qr{width:120px;height:120px;background:#fff;padding:6px;border-radius:4px}
.contact-page .line-qr{width:140px;height:140px;box-shadow:0 0 0 1px var(--zinc-100)}
.contact-page .line-box p{margin:0;max-width:18em}
.btn-line{background:#06c755;margin:0}
.btn-line:hover{background:#05a647}

/* article pages */
.article{max-width:820px;padding-top:48px;padding-bottom:64px}
.crumb{font-size:15px;margin-bottom:8px}
.lede{font-size:19px;color:var(--zinc-600);max-width:40em}
.article ol,.article ul{padding-left:1.4em}
.article ul.plain{padding-left:0}
.contact-wrap{max-width:var(--wrap)}
.article li{margin-bottom:.5em}
.figs{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:1.5em 0}
.figs figure,.wide-fig{margin:0}
.figs img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:3px;background:var(--zinc-050)}
figure.inline{margin:.5em 0 1.5em;display:flex;flex-wrap:wrap;gap:8px;align-items:flex-end}
figure.inline img{max-width:260px;border-radius:3px}
figure.inline figcaption{width:100%;font-size:14px;color:var(--zinc-600)}
.note{background:var(--zinc-050);border-left:4px solid var(--molten);padding:16px 20px;margin:1.5em 0}
.note p:last-child{margin:0}
.spec{border-collapse:collapse;width:100%;margin:1em 0 2em}
.spec th,.spec td{text-align:left;vertical-align:top;padding:12px 16px 12px 0;border-bottom:1px solid var(--zinc-100)}
.spec th{width:32%;font-weight:600;color:var(--zinc-600)}
.steps{counter-reset:none}
.motto{font:600 20px var(--display);border-left:4px solid var(--molten);padding-left:16px}
.partners{display:flex;flex-wrap:wrap;gap:24px;align-items:center}
.partners img{max-height:64px;width:auto}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding-bottom:64px}
.gallery figure{margin:0}
.gallery img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:3px}
.contact-page{grid-template-columns:1fr 1fr}
.map iframe{width:100%;height:440px;border:0;border-radius:3px;background:var(--zinc-050)}

/* footer */
.foot{background:var(--ink);color:#d6dde1;padding:56px 0 24px;font-size:15px}
.foot a{color:#fff}
.foot h2{font-size:17px;margin:0 0 .8em;color:#fff}
.foot-grid{display:grid;grid-template-columns:1.3fr 1.3fr 1fr;gap:40px}
.foot-name{font:600 19px var(--display);color:#fff}
.foot-name span{font:400 14px var(--body);color:var(--zinc-300)}
.copy{margin-top:32px;padding-top:16px;border-top:1px solid #33434d;font-size:13px;color:var(--zinc-300)}

@media (max-width:980px){
  .menu-btn{display:block}
  .top-call{display:none}
  #nav{position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--zinc-100);display:none}
  #nav.open{display:block}
  #nav ul{flex-direction:column;padding:8px 24px 16px}
  .hero-in,.two,.contact-row,.contact-page,.foot-grid{grid-template-columns:1fr}
  .specs dl{grid-template-columns:1fr 1fr}
  .specs div:nth-child(3){padding-left:0;border-left:0}
  .works,.gallery{grid-template-columns:1fr 1fr}
}
@media (max-width:560px){
  .line-qr{display:none}
  body{font-size:16px}
  .brand span{display:none}
  .works,.gallery{grid-template-columns:1fr}
  .specs dl{grid-template-columns:1fr}
  .specs div,.specs div+div{padding-left:0;border-left:0;border-bottom:1px solid #3b4b55}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto}}