/* ============================================================
   26 การก่อสร้าง — Design tokens
   Concept: architectural drawing / blueprint annotation, cast in
   earth-brown & site-amber instead of blueprint-blue. Dimension
   lines and a title-block footer are the signature devices.
   ============================================================ */

:root{
  --umber-950:#221609;
  --umber-900:#2b1c0f;
  --umber-800:#3c2717;
  --umber-700:#513423;
  --brown-600:#7a4a28;
  --brown-500:#95602f;
  --brown-400:#b17d46;
  --concrete-300:#c9c0ae;
  --concrete-200:#ddd6c7;
  --paper-100:#efe7d8;
  --paper-50:#f7f2e7;
  --amber-500:#c8892c;
  --amber-600:#a86f20;
  --ink-900:#211609;
  --ink-700:#3d2d1c;

  --font-display:"Bai Jamjuree", "Noto Sans Thai", sans-serif;
  --font-body:"Sarabun", "Noto Sans Thai", sans-serif;
  --font-mono:"JetBrains Mono", ui-monospace, monospace;

  --container:1180px;
  --radius:2px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink-900);
  background:var(--paper-50);
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.25;
  margin:0 0 .5em;
  color:var(--umber-950);
  letter-spacing:.01em;
}
p{margin:0 0 1em;}
ul{margin:0;padding:0;}
.container{
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:0.001ms !important; transition-duration:0.001ms !important;}
}

:focus-visible{
  outline:3px solid var(--amber-500);
  outline-offset:2px;
}

/* ---------------- utility label / eyebrow ---------------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--amber-600);
  margin-bottom:14px;
}
.eyebrow::before{
  content:"";
  width:26px;
  height:1px;
  background:var(--amber-500);
}
.section-dark .eyebrow{color:var(--amber-500);}

/* ---------------- dimension-line divider (signature) ------ */
.dim-line{
  display:flex;
  align-items:center;
  gap:10px;
  margin:10px 0 34px;
  color:var(--brown-500);
  user-select:none;
}
.dim-line .tick{width:1px;height:10px;background:currentColor;flex:none;}
.dim-line .rule{flex:1 1 auto;height:1px;background:currentColor;position:relative;min-width:40px;}
.dim-line .label{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.06em;
  color:var(--brown-500);
  white-space:nowrap;
}
.section-dark .dim-line,.section-dark .dim-line .label{color:var(--brown-400);}

/* dimension frame around a photo, like a drafted callout */
.dim-frame{position:relative;}
.dim-frame::before,.dim-frame::after{
  content:"";
  position:absolute;
  width:18px;height:18px;
  border-top:1px solid var(--amber-500);
  border-left:1px solid var(--amber-500);
  top:-9px;left:-9px;
}
.dim-frame::after{
  top:auto;left:auto;bottom:-9px;right:-9px;
  border-top:none;border-left:none;
  border-bottom:1px solid var(--amber-500);
  border-right:1px solid var(--amber-500);
}
.dim-frame .tag{
  position:absolute;
  bottom:14px;left:14px;
  background:var(--umber-950);
  color:var(--paper-100);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  padding:5px 10px;
  border:1px solid var(--amber-500);
}

/* ================= header / nav ================= */
.site-header{
  position:sticky;top:0;z-index:50;
  background:var(--umber-950);
  border-bottom:1px solid var(--umber-700);
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 24px;
  max-width:var(--container);
  margin:0 auto;
}
.brand{display:flex;align-items:center;gap:12px;}
.brand-mark{
  width:46px;height:46px;flex:none;
  border:1px solid var(--amber-500);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-display);
  font-weight:700;font-size:1.15rem;
  color:var(--paper-100);
  position:relative;
}
.brand-mark::before,.brand-mark::after{
  content:"";position:absolute;width:6px;height:6px;
  border-top:1px solid var(--amber-500);border-left:1px solid var(--amber-500);
  top:-1px;left:-1px;
}
.brand-mark::after{
  top:auto;left:auto;bottom:-1px;right:-1px;
  border-top:none;border-left:none;
  border-bottom:1px solid var(--amber-500);border-right:1px solid var(--amber-500);
}
.brand-text{color:var(--paper-100);}
.brand-text .name{
  display:block;font-family:var(--font-display);font-weight:700;
  font-size:1.05rem;letter-spacing:.01em;
}
.brand-text .tag{
  display:block;font-family:var(--font-mono);font-size:.66rem;
  letter-spacing:.1em;color:var(--concrete-300);text-transform:uppercase;
  margin-top:2px;
}
.nav-links{display:flex;align-items:center;gap:30px;}
.nav-links a{
  color:var(--concrete-200);
  font-size:.95rem;
  padding:6px 2px;
  border-bottom:1px solid transparent;
  transition:color .15s, border-color .15s;
}
.nav-links a:hover,.nav-links a.active{
  color:var(--paper-100);
  border-bottom-color:var(--amber-500);
}
.nav-cta{
  margin-left:8px;
  background:var(--amber-500);
  color:var(--umber-950) !important;
  padding:9px 18px;
  font-weight:600;
  border:1px solid transparent;
}
.nav-cta:hover{background:var(--amber-600);border-bottom-color:transparent !important;}
.nav-toggle{
  display:none;
  background:none;border:1px solid var(--concrete-300);
  color:var(--paper-100);
  width:42px;height:38px;
  align-items:center;justify-content:center;
  cursor:pointer;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";display:block;width:18px;height:1px;background:var(--paper-100);
  position:relative;
}
.nav-toggle span::before{position:absolute;top:-6px;}
.nav-toggle span::after{position:absolute;top:6px;}

@media (max-width:860px){
  .nav-links{
    position:absolute;top:100%;left:0;right:0;
    background:var(--umber-950);
    flex-direction:column;align-items:flex-start;
    padding:10px 24px 22px;
    gap:16px;
    border-bottom:1px solid var(--umber-700);
    display:none;
  }
  .nav-links.open{display:flex;}
  .nav-cta{margin-left:0;}
  .nav-toggle{display:flex;}
}

/* ================= buttons ================= */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 24px;
  font-family:var(--font-body);
  font-weight:600;font-size:.96rem;
  border:1px solid var(--brown-600);
  cursor:pointer;
}
.btn-primary{background:var(--amber-500);border-color:var(--amber-500);color:var(--umber-950);}
.btn-primary:hover{background:var(--amber-600);border-color:var(--amber-600);}
.btn-outline{background:transparent;border-color:var(--concrete-300);color:var(--paper-100);}
.btn-outline:hover{border-color:var(--paper-100);}
.btn-line{background:#06C755;border-color:#06C755;color:#fff;}
.btn-line:hover{filter:brightness(.94);}
.btn-row{display:flex;flex-wrap:wrap;gap:14px;}

/* ================= hero ================= */
.hero{
  position:relative;
  min-height:86vh;
  display:flex;align-items:flex-end;
  color:var(--paper-100);
  overflow:hidden;
}
.hero-media{position:absolute;inset:0;z-index:0;}
.hero-media img{width:100%;height:100%;object-fit:cover;}
.hero-media::after{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(0deg, rgba(34,22,9,.94) 4%, rgba(34,22,9,.55) 46%, rgba(34,22,9,.35) 100%);
}
.hero-inner{position:relative;z-index:1;width:100%;padding:70px 24px 60px;}
.hero-content{max-width:var(--container);margin:0 auto;position:relative;padding:0 0 0 0;}
.hero h1{
  color:var(--paper-100);
  font-size:clamp(2.1rem,5vw,3.6rem);
  max-width:16ch;
  margin-bottom:.4em;
}
.hero .lead{
  max-width:52ch;
  color:var(--concrete-200);
  font-size:1.08rem;
  margin-bottom:1.6em;
}
.hero-frame{position:absolute;inset:24px;border:1px solid rgba(239,231,216,.35);pointer-events:none;}
.hero-frame::before,.hero-frame::after,
.hero-corner-b::before,.hero-corner-b::after{content:none;}
.corner{position:absolute;width:26px;height:26px;z-index:2;}
.corner::before,.corner::after{content:"";position:absolute;background:var(--amber-500);}
.c-tl{top:22px;left:22px;} .c-tl::before{width:26px;height:1px;top:0;left:0;} .c-tl::after{width:1px;height:26px;top:0;left:0;}
.c-tr{top:22px;right:22px;} .c-tr::before{width:26px;height:1px;top:0;right:0;} .c-tr::after{width:1px;height:26px;top:0;right:0;}
.c-bl{bottom:22px;left:22px;} .c-bl::before{width:26px;height:1px;bottom:0;left:0;} .c-bl::after{width:1px;height:26px;bottom:0;left:0;}
.c-br{bottom:22px;right:22px;} .c-br::before{width:26px;height:1px;bottom:0;right:0;} .c-br::after{width:1px;height:26px;bottom:0;right:0;}

.hero-tag{
  position:absolute; top:22px; right:22px;
  transform:translateY(-140%);
  font-family:var(--font-mono);
  font-size:.7rem;letter-spacing:.1em;
  color:var(--concrete-300);
  text-align:right;
}

/* ================= sections ================= */
.section{padding:96px 0;}
.section-light{background:var(--paper-50);}
.section-paper{background:var(--paper-100);}
.section-dark{background:var(--umber-950);color:var(--paper-100);}
.section-dark h2,.section-dark h3,.section-dark h4{color:var(--paper-100);}
.section-dark p{color:var(--concrete-200);}
.section-head{max-width:640px;margin-bottom:20px;}
.section-head h2{font-size:clamp(1.6rem,3vw,2.3rem);}
.section-intro{max-width:640px;color:var(--ink-700);}
.section-dark .section-intro{color:var(--concrete-200);}

/* grid pattern backdrop for dark sections */
.grid-bg{
  background-image:
    linear-gradient(rgba(239,231,216,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(239,231,216,.05) 1px, transparent 1px);
  background-size:44px 44px;
}

/* ================= service cards ================= */
.services-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  background:var(--concrete-300);
  border:1px solid var(--concrete-300);
  margin-top:40px;
}
.service-card{
  background:var(--paper-50);
  padding:30px 26px 34px;
  display:flex;flex-direction:column;
}
.service-card .num{
  font-family:var(--font-mono);
  font-size:.75rem;color:var(--amber-600);
  margin-bottom:18px;
}
.service-card h3{font-size:1.15rem;margin-bottom:10px;}
.service-card p{color:var(--ink-700);font-size:.94rem;margin-bottom:0;flex:1;}
.service-card .cat{
  margin-top:18px;font-family:var(--font-mono);font-size:.68rem;
  letter-spacing:.06em;color:var(--brown-500);text-transform:uppercase;
}
@media (max-width:960px){.services-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:600px){.services-grid{grid-template-columns:1fr;}}

/* ================= feature / why-us row =========== */
.features-row{
  display:grid;grid-template-columns:repeat(4,1fr);
  margin-top:44px;
}
.feature{
  padding:0 22px;
  border-left:1px solid var(--umber-700);
}
.feature:first-child{border-left:none;padding-left:0;}
.feature .fnum{
  font-family:var(--font-mono);font-size:.78rem;color:var(--amber-500);
  margin-bottom:10px;
}
.feature h4{font-size:1.02rem;color:var(--paper-100);margin-bottom:8px;}
.feature p{font-size:.9rem;color:var(--concrete-300);margin:0;}
@media (max-width:860px){
  .features-row{grid-template-columns:1fr 1fr;row-gap:32px;}
  .feature{border-left:none;border-top:1px solid var(--umber-700);padding:22px 0 0;}
  .feature:nth-child(2){padding-left:0;}
}
@media (max-width:520px){.features-row{grid-template-columns:1fr;}}

/* ================= process steps (real sequence => numbered) === */
.process{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:0;margin-top:40px;
  position:relative;
}
.process-step{
  position:relative;
  padding:0 24px 0 0;
}
.process-step .step-no{
  font-family:var(--font-display);font-weight:700;
  font-size:2.4rem;color:var(--concrete-200);
  -webkit-text-stroke:1px var(--brown-500);
  color:transparent;
  line-height:1;margin-bottom:14px;
  display:block;
}
.process-step h4{font-size:1.02rem;margin-bottom:8px;}
.process-step p{font-size:.9rem;color:var(--ink-700);margin:0;}
.process-step:not(:last-child)::after{
  content:"";position:absolute;top:20px;right:0;
  width:1px;height:calc(100% - 40px);
  background:var(--concrete-300);
}
@media (max-width:860px){
  .process{grid-template-columns:1fr 1fr;row-gap:34px;}
  .process-step:not(:last-child)::after{display:none;}
}
@media (max-width:520px){.process{grid-template-columns:1fr;}}

/* ================= gallery ================= */
.gallery-grid{
  display:grid;
  grid-template-columns:repeat(6,1fr);
  grid-auto-rows:150px;
  gap:8px;
  margin-top:40px;
}
.gallery-grid img{width:100%;height:100%;object-fit:cover;}
.g1{grid-column:span 3;grid-row:span 2;}
.g2{grid-column:span 3;grid-row:span 1;}
.g3{grid-column:span 2;grid-row:span 1;}
.g4{grid-column:span 3;grid-row:span 1;}
.g5{grid-column:span 2;grid-row:span 2;}
.g6{grid-column:span 2;grid-row:span 1;}
@media (max-width:760px){
  .gallery-grid{grid-template-columns:repeat(2,1fr);grid-auto-rows:170px;}
  .gallery-grid > *{grid-column:span 1 !important;grid-row:span 1 !important;}
}

/* ================= cta band ================= */
.cta-band{
  padding:70px 0;
  background:var(--brown-600);
  color:var(--paper-100);
}
.cta-inner{
  display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;
}
.cta-inner h2{color:var(--paper-100);margin-bottom:6px;font-size:clamp(1.4rem,3vw,2rem);}
.cta-inner p{color:var(--concrete-200);margin:0;}

/* ================= cards (about/values) ================= */
.value-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:40px;
}
.value-card{
  background:var(--paper-50);
  border:1px solid var(--concrete-300);
  padding:26px 22px;
}
.value-card h4{font-size:1rem;margin-bottom:8px;}
.value-card p{font-size:.9rem;color:var(--ink-700);margin:0;}
@media (max-width:860px){.value-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:520px){.value-grid{grid-template-columns:1fr;}}

.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:44px;}
.stat b{
  display:block;font-family:var(--font-display);font-weight:700;
  font-size:2.2rem;color:var(--umber-950);
}
.stat span{font-family:var(--font-mono);font-size:.75rem;color:var(--brown-500);letter-spacing:.06em;}
.section-dark .stat b{color:var(--paper-100);}
@media (max-width:760px){.stat-row{grid-template-columns:1fr 1fr;row-gap:28px;}}

/* two column split */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center;}
.split.reverse{grid-template-columns:.95fr 1.05fr;}
.split.reverse .split-media{order:2;}
@media (max-width:900px){
  .split,.split.reverse{grid-template-columns:1fr;}
  .split.reverse .split-media{order:0;}
}
.split-media img{width:100%;height:420px;object-fit:cover;}

/* ================= contact page ================= */
.contact-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:1px;
  background:var(--concrete-300);border:1px solid var(--concrete-300);
  margin-top:20px;
}
.contact-card{background:var(--paper-50);padding:30px 28px;}
.contact-card .label{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--amber-600);margin-bottom:10px;display:block;
}
.contact-card .value{font-size:1.15rem;font-weight:600;color:var(--umber-950);}
.contact-card .value a:hover{color:var(--amber-600);}
.contact-card small{display:block;color:var(--ink-700);font-size:.85rem;margin-top:6px;}
@media (max-width:760px){.contact-grid{grid-template-columns:1fr;}}

.map-wrap{border:1px solid var(--concrete-300);margin-top:40px;}
.map-wrap iframe{width:100%;height:420px;border:0;display:block;filter:grayscale(.15) contrast(1.02);}

/* ================= title-block footer (signature) ================= */
.site-footer{
  background:var(--umber-950);
  color:var(--concrete-300);
  border-top:1px solid var(--umber-700);
}
.footer-top{padding:56px 0 0;}
.footer-brand{display:flex;align-items:center;gap:14px;margin-bottom:18px;}
.footer-brand .brand-text .name{color:var(--paper-100);}
.footer-links{display:flex;gap:26px;flex-wrap:wrap;margin:22px 0 40px;}
.footer-links a{font-size:.92rem;color:var(--concrete-300);}
.footer-links a:hover{color:var(--paper-100);}

.title-block{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--umber-700);
}
.tb-cell{
  padding:18px 22px;
  border-left:1px solid var(--umber-700);
}
.tb-cell:first-child{border-left:none;}
.tb-cell .tb-label{
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--brown-400);margin-bottom:6px;display:block;
}
.tb-cell .tb-value{font-size:.9rem;color:var(--concrete-200);line-height:1.55;}
.tb-cell .tb-value a:hover{color:var(--amber-500);}
@media (max-width:860px){
  .title-block{grid-template-columns:1fr 1fr;}
  .tb-cell:nth-child(3){border-left:none;}
}
@media (max-width:520px){
  .title-block{grid-template-columns:1fr;}
  .tb-cell{border-left:none;border-top:1px solid var(--umber-700);}
  .tb-cell:first-child{border-top:none;}
}
.footer-bottom{
  padding:16px 24px;
  border-top:1px solid var(--umber-700);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
  max-width:var(--container);margin:0 auto;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;
  color:var(--concrete-300);
}
.footer-bottom a:hover{color:var(--paper-100);}

/* ================= page hero (inner pages) ================= */
.page-hero{
  background:var(--umber-950);
  color:var(--paper-100);
  padding:150px 0 64px;
  position:relative;
}
.page-hero h1{color:var(--paper-100);font-size:clamp(1.9rem,4vw,2.8rem);margin-bottom:.35em;}
.page-hero p{color:var(--concrete-200);max-width:60ch;margin:0;}
.breadcrumb{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;
  color:var(--concrete-300);text-transform:uppercase;margin-bottom:18px;
}
.breadcrumb a:hover{color:var(--amber-500);}

/* ================= misc content (privacy) ================= */
.prose h2{font-size:1.3rem;margin-top:2em;}
.prose h2:first-child{margin-top:0;}
.prose p,.prose li{color:var(--ink-700);}
.prose ul{margin:0 0 1.2em 1.2em;}
.prose li{margin-bottom:.5em;}
.prose{max-width:760px;}
.updated{
  font-family:var(--font-mono);font-size:.78rem;color:var(--brown-500);
  margin-bottom:36px;display:inline-block;
  border:1px solid var(--concrete-300);padding:8px 14px;
}