/* =========================================================
   ไทยพิพัฒน์โซลูชั่น — Design System
   Palette:
     --navy     #1B3A4B  (steel-blue — primary, construction/industrial)
     --charcoal #202325  (near-black — dark sections)
     --yellow   #FDB813  (safety/hazard yellow — accent / CTA)
     --steel    #6B7680  (steel gray — secondary text)
     --concrete #D9D4C7  (concrete tone — warm neutral)
     --paper    #F5F2EA  (off-white — light background)
   Type:
     Display: Kanit (bold, industrial, Thai-native)
     Body:    Sarabun (clean, legible Thai body face)
   Signature motifs: hazard-stripe divider, blueprint grid texture,
   punched "price-tag" card (nods to a hardware-store price ticket).
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Kanit:wght@400;600;700;800&family=Sarabun:wght@300;400;500;600;700&display=swap');

:root{
  --navy:#1B3A4B;
  --navy-light:#2C5570;
  --charcoal:#202325;
  --yellow:#FDB813;
  --yellow-dark:#E0A000;
  --steel:#6B7680;
  --concrete:#D9D4C7;
  --paper:#F5F2EA;
  --paper-dim:#EDE7D8;
  --line:rgba(27,58,75,0.14);
  --line-light:rgba(245,242,234,0.18);
  --shadow:0 18px 40px rgba(20,26,30,0.18);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;font-family:'Sarabun',sans-serif;color:var(--charcoal);background:var(--paper);
  line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:'Kanit',sans-serif;font-weight:800;line-height:1.15;margin:0 0 .5em;letter-spacing:.01em;}
p{margin:0 0 1.2em;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
ul{margin:0;padding:0;}
:focus-visible{outline:3px solid var(--yellow);outline-offset:2px;}
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 24px;}
.eyebrow{
  font-family:'Kanit',sans-serif;font-weight:600;letter-spacing:.22em;text-transform:uppercase;
  font-size:.78rem;color:var(--yellow-dark);display:inline-flex;align-items:center;gap:10px;margin-bottom:14px;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--yellow-dark);display:inline-block;}
.on-dark .eyebrow, .on-navy .eyebrow{color:var(--yellow);}
.on-dark .eyebrow::before, .on-navy .eyebrow::before{background:var(--yellow);}
@media(prefers-reduced-motion:no-preference){
  .reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease, transform .7s ease;}
  .reveal.in{opacity:1;transform:none;}
}

/* ---------- Hazard stripe divider (signature texture) ---------- */
.hazard{
  height:14px;width:100%;
  background:repeating-linear-gradient(135deg, var(--yellow) 0 22px, var(--charcoal) 22px 44px);
}

/* ---------- Blueprint grid background (signature texture) ---------- */
.blueprint-bg{
  position:relative;background-color:var(--navy);
  background-image:
    linear-gradient(rgba(245,242,234,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245,242,234,.07) 1px, transparent 1px);
  background-size:38px 38px;
}

/* ---------- Header / Nav ---------- */
.site-header{position:sticky;top:0;z-index:100;background:var(--charcoal);border-bottom:3px solid var(--yellow);}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;max-width:1180px;margin:0 auto;}
.brand{display:flex;align-items:center;gap:12px;color:var(--paper);}
.brand-mark{
  width:42px;height:42px;flex:none;background:var(--yellow);
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
  display:flex;align-items:center;justify-content:center;
  font-family:'Kanit',sans-serif;font-weight:800;color:var(--charcoal);font-size:1rem;
}
.brand-text{display:flex;flex-direction:column;line-height:1.1;}
.brand-text strong{font-family:'Kanit',sans-serif;font-weight:800;font-size:1.05rem;letter-spacing:.01em;}
.brand-text span{font-size:.66rem;letter-spacing:.12em;color:var(--concrete);text-transform:uppercase;}
nav.main-nav{display:flex;gap:6px;align-items:center;}
nav.main-nav a{
  color:var(--paper);font-family:'Kanit',sans-serif;font-size:.9rem;font-weight:600;
  padding:10px 15px;border-radius:2px;transition:background .2s,color .2s;
}
nav.main-nav a:hover, nav.main-nav a.active{background:var(--yellow);color:var(--charcoal);}
.nav-cta{background:var(--yellow)!important;color:var(--charcoal)!important;margin-left:6px;}
.nav-toggle{display:none;}
@media(max-width:900px){
  nav.main-nav{
    position:fixed;inset:66px 0 0 0;background:var(--charcoal);flex-direction:column;align-items:stretch;
    padding:10px 20px;transform:translateY(-110%);transition:transform .3s ease;gap:2px;
  }
  nav.main-nav.open{transform:translateY(0);}
  nav.main-nav a{padding:16px;font-size:1.05rem;text-align:center;}
  .nav-toggle{display:flex;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px;}
  .nav-toggle span{width:26px;height:3px;background:var(--paper);}
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;font-family:'Kanit',sans-serif;font-weight:700;
  font-size:.95rem;padding:15px 30px;border:2px solid transparent;cursor:pointer;letter-spacing:.02em;
  transition:transform .2s ease, background .2s ease, color .2s ease, border-color .2s;
}
.btn-primary{background:var(--yellow);color:var(--charcoal);}
.btn-primary:hover{transform:translateY(-2px);background:var(--yellow-dark);}
.btn-outline{border-color:var(--paper);color:var(--paper);}
.btn-outline:hover{background:var(--paper);color:var(--charcoal);}
.btn-outline-dark{border-color:var(--charcoal);color:var(--charcoal);}
.btn-outline-dark:hover{background:var(--charcoal);color:var(--paper);}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:82vh;display:flex;align-items:flex-end;color:var(--paper);background:var(--navy);overflow:hidden;}
.hero-media{position:absolute;inset:0;z-index:-1;}
.hero-media img{width:100%;height:100%;object-fit:cover;}
.hero-media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg, rgba(15,25,31,.6) 0%, rgba(15,25,31,.4) 40%, rgba(15,25,31,.96) 100%);}
.hero-inner{padding:90px 24px 56px;max-width:1180px;margin:0 auto;width:100%;position:relative;}
.hero h1{font-size:clamp(2.1rem,5.2vw,3.8rem);max-width:16ch;text-transform:uppercase;margin-bottom:.3em;}
.hero h1 em{font-style:normal;color:var(--yellow);}
.hero p.lead{font-size:1.1rem;max-width:54ch;color:var(--concrete);margin-bottom:2em;}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;}
.hero-badges{display:flex;gap:28px;margin-top:48px;flex-wrap:wrap;border-top:1px solid var(--line-light);padding-top:24px;}
.hero-badges div{display:flex;flex-direction:column;}
.hero-badges strong{font-family:'Kanit',sans-serif;font-size:1.5rem;color:var(--yellow);}
.hero-badges span{font-size:.76rem;color:var(--concrete);letter-spacing:.05em;}

/* ---------- Price-tag plate (signature element) ---------- */
.price-tag{
  background:linear-gradient(160deg,#25313a,#151c20 60%);
  border:1px solid rgba(245,242,234,.14);padding:30px 28px 26px;position:relative;color:var(--paper);
  box-shadow:var(--shadow);
}
.price-tag::before{
  content:"";position:absolute;top:22px;left:-11px;width:22px;height:22px;border-radius:50%;
  background:var(--paper);box-shadow:inset 0 0 0 3px var(--charcoal);
}
.price-tag .tag-label{font-family:'Kanit',sans-serif;font-size:.72rem;letter-spacing:.2em;color:var(--yellow);text-transform:uppercase;margin-bottom:10px;display:block;}
.price-tag h3,.price-tag h4{color:var(--paper);}
.price-tag .spec-row{display:flex;justify-content:space-between;gap:10px;padding:10px 0;border-top:1px dashed rgba(245,242,234,.18);font-size:.92rem;}
.price-tag .spec-row:first-of-type{border-top:none;}
.price-tag .spec-row span:first-child{color:var(--concrete);}
.price-tag .spec-row span:last-child{font-family:'Kanit',sans-serif;font-weight:600;text-align:right;}

/* ---------- Section basics ---------- */
section{padding:88px 0;}
.section-tight{padding:56px 0;}
.section-head{max-width:680px;margin-bottom:48px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.section-head h2{font-size:clamp(1.7rem,3.2vw,2.4rem);text-transform:uppercase;}
.on-dark{background:var(--charcoal);color:var(--paper);}
.on-dark .section-head p{color:var(--concrete);}
.on-navy{background:var(--navy);color:var(--paper);}
.on-navy .section-head p{color:var(--concrete);}
.on-sand{background:var(--paper-dim);}

/* ---------- Grids / Cards ---------- */
.grid{display:grid;gap:26px;}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
@media(max-width:900px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}}

.feature-card{background:var(--paper);border:1px solid var(--line);padding:28px 24px;position:relative;}
.feature-card .num{font-family:'Kanit',sans-serif;font-weight:800;color:var(--concrete);font-size:2.1rem;position:absolute;top:14px;right:18px;opacity:.7;}
.feature-card h3{font-size:1.1rem;text-transform:uppercase;}
.feature-card p{color:var(--steel);margin-bottom:0;font-size:.95rem;}

.media-card{background:var(--paper);border:1px solid var(--line);overflow:hidden;}
.media-card img{width:100%;height:220px;object-fit:cover;}
.media-card .body{padding:20px 20px 24px;}
.media-card h3{font-size:1.1rem;text-transform:uppercase;margin-bottom:.4em;}
.media-card p{color:var(--steel);font-size:.93rem;margin-bottom:12px;}
.media-card .tag{font-family:'Kanit',sans-serif;font-size:.68rem;letter-spacing:.13em;text-transform:uppercase;color:var(--yellow-dark);}

.use-case{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);background:var(--paper);overflow:hidden;margin-bottom:24px;}
.use-case img{width:100%;height:100%;object-fit:cover;min-height:250px;}
.use-case .body{padding:32px 30px;align-self:center;}
.use-case:nth-child(even){direction:rtl;}
.use-case:nth-child(even) .body{direction:ltr;}
@media(max-width:820px){.use-case{grid-template-columns:1fr;}.use-case:nth-child(even){direction:ltr;}}

blockquote.testimonial{border-left:4px solid var(--yellow-dark);padding:6px 0 6px 22px;margin:0;font-family:'Kanit',sans-serif;font-weight:500;font-size:1.1rem;color:var(--charcoal);}
blockquote.testimonial footer{margin-top:12px;font-family:'Sarabun',sans-serif;font-weight:600;font-size:.86rem;color:var(--steel);}

.faq-item{border-top:1px solid var(--line);padding:20px 0;}
.faq-item:last-child{border-bottom:1px solid var(--line);}
.faq-item summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:20px;font-family:'Kanit',sans-serif;font-weight:600;font-size:1.02rem;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:1.5rem;color:var(--yellow-dark);flex:none;}
.faq-item[open] summary::after{content:"–";}
.faq-item .a{color:var(--steel);margin-top:12px;max-width:70ch;}

table.spec-table{width:100%;border-collapse:collapse;font-size:.93rem;}
table.spec-table th,table.spec-table td{text-align:left;padding:13px 15px;border-bottom:1px solid var(--line);}
table.spec-table th{font-family:'Kanit',sans-serif;background:var(--navy);color:var(--paper);text-transform:uppercase;font-size:.78rem;letter-spacing:.06em;}
table.spec-table tr:nth-child(even) td{background:var(--paper-dim);}
.table-scroll{overflow-x:auto;}

.timeline{border-left:2px solid var(--concrete);padding-left:30px;position:relative;}
.timeline-item{position:relative;padding-bottom:40px;}
.timeline-item:last-child{padding-bottom:0;}
.timeline-item::before{content:"";position:absolute;left:-36px;top:4px;width:14px;height:14px;background:var(--yellow);border-radius:50%;border:3px solid var(--paper);box-shadow:0 0 0 2px var(--yellow-dark);}
.timeline-item h4{font-family:'Kanit',sans-serif;color:var(--yellow-dark);font-size:.92rem;letter-spacing:.08em;text-transform:uppercase;margin-bottom:6px;}

.value-badge{display:flex;gap:16px;align-items:flex-start;padding:20px 0;border-top:1px solid var(--line-light);}
.value-badge:first-child{border-top:none;}
.value-badge .icon{font-family:'Kanit',sans-serif;font-weight:800;color:var(--yellow);font-size:1.35rem;flex:none;width:42px;}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;}
@media(max-width:900px){.contact-grid{grid-template-columns:1fr;}}
.contact-item{display:flex;gap:16px;padding:18px 0;border-top:1px solid var(--line);}
.contact-item:first-child{border-top:none;}
.contact-item .ic{font-family:'Kanit',sans-serif;font-weight:800;color:var(--charcoal);background:var(--yellow);width:42px;height:42px;display:flex;align-items:center;justify-content:center;flex:none;font-size:1.05rem;}
.contact-item h4{font-size:.98rem;text-transform:uppercase;margin-bottom:4px;}
.contact-item p{color:var(--steel);margin-bottom:0;font-size:.93rem;}

form.inquiry{background:var(--paper);border:1px solid var(--line);padding:30px;}
form.inquiry label{display:block;font-family:'Kanit',sans-serif;font-size:.8rem;letter-spacing:.05em;text-transform:uppercase;margin-bottom:8px;color:var(--steel);}
form.inquiry .field{margin-bottom:18px;}
form.inquiry .field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
@media(max-width:560px){form.inquiry .field-row{grid-template-columns:1fr;}}
form.inquiry input,form.inquiry select,form.inquiry textarea{width:100%;padding:12px 14px;border:1px solid var(--line);background:#fff;font-family:'Sarabun',sans-serif;font-size:.95rem;color:var(--charcoal);}
form.inquiry input:focus,form.inquiry select:focus,form.inquiry textarea:focus{outline:2px solid var(--yellow-dark);outline-offset:1px;}
form.inquiry textarea{resize:vertical;min-height:110px;}
.form-note{font-size:.8rem;color:var(--steel);margin-top:10px;}

.map-frame{border:1px solid var(--line);height:340px;overflow:hidden;}
.map-frame iframe{width:100%;height:100%;border:0;}

/* ---------- CTA band ---------- */
.cta-band{background:var(--yellow);color:var(--charcoal);padding:60px 0;text-align:center;}
.cta-band h2{font-size:clamp(1.5rem,3.2vw,2.2rem);text-transform:uppercase;}
.cta-band .btn-outline-dark{margin-top:8px;}

/* ---------- Footer ---------- */
footer.site-footer{background:var(--charcoal);color:var(--concrete);padding:60px 0 24px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.1fr;gap:32px;margin-bottom:44px;}
@media(max-width:900px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media(max-width:560px){.footer-grid{grid-template-columns:1fr;}}
footer.site-footer h5{font-family:'Kanit',sans-serif;color:var(--paper);text-transform:uppercase;font-size:.82rem;letter-spacing:.1em;margin-bottom:16px;}
footer.site-footer p, footer.site-footer li{font-size:.87rem;color:var(--concrete);margin-bottom:10px;}
footer.site-footer a:hover{color:var(--yellow);}
footer.site-footer ul{list-style:none;}
.footer-bottom{border-top:1px solid var(--line-light);padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:.76rem;color:var(--steel);}
.social-row{display:flex;gap:10px;margin-top:6px;}
.social-row a{width:36px;height:36px;border:1px solid var(--line-light);display:flex;align-items:center;justify-content:center;font-family:'Kanit',sans-serif;font-weight:700;font-size:.78rem;}
.social-row a:hover{background:var(--yellow);color:var(--charcoal);border-color:var(--yellow);}

/* ---------- Page header (interior pages) ---------- */
.page-header{background:var(--navy);color:var(--paper);padding:120px 0 56px;position:relative;}
.page-header h1{font-size:clamp(1.9rem,4vw,2.9rem);text-transform:uppercase;max-width:22ch;}
.breadcrumb{font-size:.8rem;color:var(--concrete);margin-bottom:16px;}
.breadcrumb a:hover{color:var(--yellow);}

/* ---------- Utility ---------- */
.text-steel{color:var(--steel);}
.center{text-align:center;}
.narrow{max-width:760px;margin:0 auto;}
.divider-sand{height:1px;background:var(--line);margin:52px 0;}
.badge-strip{display:flex;flex-wrap:wrap;gap:12px;margin-top:16px;}
.badge-strip span{border:1px solid var(--line);padding:8px 14px;font-size:.78rem;font-family:'Kanit',sans-serif;letter-spacing:.03em;color:var(--steel);}
.pull-stat{display:flex;gap:34px;flex-wrap:wrap;}
.pull-stat div strong{display:block;font-family:'Kanit',sans-serif;font-size:2.3rem;color:var(--navy);}
.pull-stat div span{font-size:.8rem;color:var(--steel);letter-spacing:.03em;}