/* ===================================================================
   ติดตั้ง Solar Rooftop — Solar installation landing site
   Theme: light industrial — gold/white pastel, red CTA, green LINE
=================================================================== */

:root{
  --bg:        #fbf9f4;
  --bg-panel:  #ffffff;
  --bg-panel2: #fff9ec;
  --bg-dark:   #1c1a14;
  --bg-dark2:  #262319;

  --ink:       #232019;
  --ink-dim:   #5b5648;
  --muted:     #8a8471;
  --line:      #ecе4d0;
  --line:      #ece4d0;
  --line-lite: #e2d6b0;

  --gold:      #d4a02a;
  --gold-lite: #f0c869;
  --gold-dim:  #a97f1f;
  --gold-bg:   #fdf3d9;

  --red:       #e02c3c;
  --red-dark:  #a91f2c;
  --red-glow:  rgba(224,44,60,.28);

  --line-green:#06c755;
  --line-green-dark:#04a648;

  --ok:        #1f9d5c;

  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 22px;

  --shadow: 0 20px 50px rgba(60,45,10,.14);
  --shadow-sm: 0 8px 24px rgba(60,45,10,.10);

  --container: 1180px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:"Sarabun","IBM Plex Sans Thai",Tahoma,sans-serif;
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4{
  font-family:"Kanit","Sarabun",sans-serif;
  font-weight:700; line-height:1.25; margin:0 0 .5em; color:#161409;
}
p{ margin:0 0 1em; color:var(--ink-dim); }
.container{ max-width:var(--container); margin:0 auto; padding:0 20px; }
section{ position:relative; }

/* ---------- signature: sun-ray divider ---------- */
.sunray{
  height:10px;
  background:repeating-linear-gradient(-45deg, var(--gold) 0 20px, #fff 20px 40px);
  opacity:.85;
}
.sunray.thin{ height:5px; }

.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family:"Kanit",sans-serif; font-weight:600; font-size:.78rem;
  letter-spacing:.14em; text-transform:uppercase; color:var(--gold-dim);
  background:var(--gold-bg); border:1px solid var(--line-lite);
  padding:6px 14px; border-radius:100px; margin-bottom:14px;
}
.eyebrow::before{ content:"☀"; color:var(--gold-dim); font-size:.8rem; }

.section-head{ max-width:680px; margin:0 0 40px; }
.section-head h2{ font-size:clamp(1.6rem,3.5vw,2.4rem); }
.section-head p{ font-size:1.02rem; }
.section-head.center{ margin-left:auto; margin-right:auto; text-align:center; }

/* =========================== HEADER =========================== */
.site-header{
  position:sticky; top:0; z-index:100;
  background:rgba(251,249,244,.92); backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{ display:flex; align-items:center; justify-content:space-between; padding:12px 20px; gap:16px; }
.brand{ display:flex; align-items:center; gap:10px; }
.brand img{ height:42px; width:auto; border-radius:8px; }
.brand-name{ font-family:"Kanit",sans-serif; font-weight:800; font-size:1.1rem; color:#161409; letter-spacing:.01em; }
.brand-name span{ color:var(--gold-dim); }

.nav-links{ display:flex; align-items:center; gap:24px; }
.nav-links a{ font-size:.92rem; color:var(--ink-dim); font-weight:600; transition:color .15s; }
.nav-links a:hover{ color:var(--gold-dim); }

.header-cta{ display:flex; align-items:center; gap:10px; }
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  font-family:"Kanit",sans-serif; font-weight:700; font-size:.95rem;
  padding:12px 22px; border-radius:100px; border:0; cursor:pointer;
  transition:transform .15s, box-shadow .15s, filter .15s;
  white-space:nowrap;
}
.btn:hover{ transform:translateY(-2px); }
.btn-call{ background:linear-gradient(135deg,var(--red),var(--red-dark)); color:#fff; box-shadow:0 10px 26px var(--red-glow); }
.btn-call:hover{ filter:brightness(1.06); }
.btn-line{ background:linear-gradient(135deg,var(--line-green),var(--line-green-dark)); color:#fff; box-shadow:0 10px 26px rgba(6,199,85,.25); }
.btn-gold{ background:linear-gradient(135deg,var(--gold),var(--gold-dim)); color:#241a02; box-shadow:0 10px 26px rgba(211,162,51,.25); }
.btn-outline{ background:transparent; color:var(--ink); border:1.5px solid var(--line-lite); }
.btn-outline:hover{ border-color:var(--gold-dim); color:var(--gold-dim); }
.btn-sm{ padding:9px 16px; font-size:.85rem; }
.btn-lg{ padding:16px 34px; font-size:1.08rem; }
.btn-block{ width:100%; }

.header-phone{ display:flex; flex-direction:column; line-height:1.15; }
.header-phone small{ color:var(--muted); font-size:.68rem; }
.header-phone strong{ font-family:"Kanit",sans-serif; font-size:1.05rem; color:#161409; }

.nav-toggle{ display:none; background:none; border:0; color:#161409; font-size:1.6rem; cursor:pointer; }

/* =========================== HERO =========================== */
.hero{
  padding:64px 0 0;
  background:
    radial-gradient(ellipse 900px 500px at 85% -10%, rgba(211,162,51,.20), transparent 60%),
    radial-gradient(ellipse 700px 500px at 5% 10%, rgba(224,44,60,.06), transparent 60%),
    var(--bg);
  overflow:hidden;
}
.hero-grid{ display:grid; grid-template-columns:1.05fr .95fr; gap:48px; align-items:center; padding-bottom:56px; }
.hero-copy .eyebrow{ margin-bottom:18px; }
.hero-copy h1{ font-size:clamp(2.1rem,4.6vw,3.3rem); letter-spacing:-.01em; }
.hero-copy h1 .accent{ color:var(--gold-dim); }
.hero-copy h1 .accent-red{ color:var(--red); }
.hero-copy .lead{ font-size:1.12rem; max-width:520px; margin-bottom:28px; }
.hero-actions{ display:flex; flex-wrap:wrap; gap:14px; margin-bottom:30px; }
.hero-trust{ display:flex; flex-wrap:wrap; gap:10px 22px; }
.hero-trust li{ display:flex; align-items:center; gap:8px; font-size:.88rem; color:var(--ink-dim); font-weight:600; }
.hero-trust li .ico{ color:var(--ok); font-size:1rem; }

.hero-media{ position:relative; }
.hero-media .frame{
  position:relative; border-radius:var(--radius-lg); overflow:hidden;
  border:1px solid var(--line-lite); box-shadow:var(--shadow); aspect-ratio:4/3.1;
}
.hero-media .frame img{ width:100%; height:100%; object-fit:cover; }
.hero-media .plate{
  position:absolute; left:-18px; bottom:26px;
  background:linear-gradient(180deg,#fff,#f3ead0); color:#241a02; border-radius:10px;
  padding:12px 18px 10px; box-shadow:var(--shadow-sm); border:3px solid var(--gold);
  transform:rotate(-3deg); font-family:"Kanit",sans-serif;
}
.hero-media .plate .top{ font-size:.62rem; letter-spacing:.1em; font-weight:700; color:#7a6120; }
.hero-media .plate .big{ font-size:1.4rem; font-weight:800; letter-spacing:.02em; }
.hero-media .badge-float{
  position:absolute; top:22px; right:-14px;
  background:#fff; border:1px solid var(--line-lite); border-radius:var(--radius);
  padding:14px 18px; box-shadow:var(--shadow-sm); display:flex; align-items:center; gap:10px;
}
.hero-media .badge-float .num{ font-family:"Kanit",sans-serif; font-weight:800; color:var(--gold-dim); font-size:1.3rem; }
.hero-media .badge-float .txt{ font-size:.72rem; color:var(--muted); line-height:1.3; }

@media(max-width:960px){
  .hero-grid{ grid-template-columns:1fr; }
  .hero-media{ order:-1; }
  .hero-media .badge-float{ right:8px; top:12px; }
  .hero-media .plate{ left:8px; bottom:12px; }
}

/* =========================== STATS BAR =========================== */
.stats-bar{ background:var(--bg-panel2); border-top:1px solid var(--line); border-bottom:1px solid var(--line); padding:26px 0; }
.stats-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:20px; text-align:center; }
.stats-grid .stat b{ display:block; font-family:"Kanit",sans-serif; font-size:clamp(1.5rem,3vw,2.1rem); color:var(--gold-dim); font-weight:800; }
.stats-grid .stat span{ font-size:.82rem; color:var(--muted); }
@media(max-width:700px){ .stats-grid{ grid-template-columns:repeat(2,1fr); } }

/* =========================== CARD BASE =========================== */
.card-base{
  background:var(--bg-panel); border:1px solid var(--line); border-radius:var(--radius);
  transition:transform .18s, border-color .18s, box-shadow .18s;
}
.card-base:hover{ transform:translateY(-6px); border-color:var(--gold-lite); box-shadow:var(--shadow-sm); }

/* =========================== SERVICES =========================== */
.services{ padding:78px 0; }
.svc-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:16px; }
.svc-card{ padding:26px 20px; text-align:center; }
.svc-card .ico{ font-size:2.1rem; margin-bottom:14px; }
.svc-card h3{ font-size:1.02rem; margin-bottom:6px; }
.svc-card p{ font-size:.83rem; margin:0; }
@media(max-width:900px){ .svc-grid{ grid-template-columns:repeat(2,1fr); } }

/* =========================== WHY US =========================== */
.why{ padding:78px 0; background:var(--bg-panel2); }
.why-grid{ display:grid; grid-template-columns:1fr 1fr; gap:48px; align-items:center; }
.why-list{ display:grid; gap:18px; }
.why-item{ display:flex; gap:16px; align-items:flex-start; background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:18px 20px; }
.why-item .n{
  flex:none; width:40px; height:40px; border-radius:50%;
  background:linear-gradient(135deg,var(--gold),var(--gold-dim)); color:#241a02;
  font-family:"Kanit",sans-serif; font-weight:800; display:grid; place-items:center; font-size:1.05rem;
}
.why-item h3{ font-size:1rem; margin-bottom:4px; }
.why-item p{ font-size:.87rem; margin:0; }
.why-media{ position:relative; border-radius:var(--radius-lg); overflow:hidden; aspect-ratio:1/1.05; border:1px solid var(--line-lite); box-shadow:var(--shadow); }
.why-media img{ width:100%; height:100%; object-fit:cover; }
@media(max-width:900px){ .why-grid{ grid-template-columns:1fr; } .why-media{ order:-1; aspect-ratio:16/10; } }

/* =========================== PROCESS =========================== */
.process{ padding:78px 0; }
.process-steps{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; position:relative; }
.process-steps::before{
  content:""; position:absolute; top:34px; left:8%; right:8%; height:2px;
  background:repeating-linear-gradient(90deg,var(--gold-lite) 0 10px,transparent 10px 20px); z-index:0;
}
.step{ position:relative; z-index:1; text-align:center; }
.step .circle{ width:68px; height:68px; border-radius:50%; margin:0 auto 16px; background:#fff; border:2px solid var(--gold-lite); display:grid; place-items:center; font-size:1.7rem; }
.step h3{ font-size:.98rem; }
.step p{ font-size:.83rem; }
@media(max-width:900px){ .process-steps{ grid-template-columns:repeat(2,1fr); } .process-steps::before{ display:none; } }

/* =========================== QUOTE CALCULATOR =========================== */
.calc-section{ padding:78px 0; background:var(--bg-panel2); }
.calc-box{
  background:#fff; border:1px solid var(--line-lite); border-radius:var(--radius-lg);
  padding:36px; box-shadow:var(--shadow); max-width:920px; margin:0 auto;
}
.calc-grid{ display:grid; grid-template-columns:1fr 1fr; gap:32px; align-items:start; }
.calc-field{ margin-bottom:18px; }
.calc-field label{ display:block; font-family:"Kanit",sans-serif; font-weight:600; font-size:.9rem; margin-bottom:8px; }
.calc-field input[type=range]{ width:100%; accent-color:var(--gold-dim); }
.calc-field .val{ font-family:"Kanit",sans-serif; font-weight:700; color:var(--gold-dim); font-size:1.1rem; }
.calc-radio-group{ display:flex; gap:10px; flex-wrap:wrap; }
.calc-radio{
  border:1.5px solid var(--line-lite); border-radius:100px; padding:8px 16px; font-size:.85rem;
  cursor:pointer; font-weight:600; transition:all .15s;
}
.calc-radio.active{ background:var(--gold-bg); border-color:var(--gold); color:var(--gold-dim); }
.calc-result{
  background:var(--gold-bg); border:1px solid var(--line-lite); border-radius:var(--radius);
  padding:26px; text-align:center;
}
.calc-result .label{ font-size:.82rem; color:var(--muted); margin-bottom:6px; }
.calc-result .kw{ font-family:"Kanit",sans-serif; font-weight:800; font-size:2.1rem; color:var(--gold-dim); }
.calc-result .price{ font-family:"Kanit",sans-serif; font-weight:800; font-size:1.5rem; color:#161409; margin-top:10px; }
.calc-result .note{ font-size:.76rem; color:var(--muted); margin-top:8px; }
@media(max-width:800px){ .calc-grid{ grid-template-columns:1fr; } }

/* =========================== GALLERY =========================== */
.gallery{ padding:78px 0; }
.gallery-grid{ display:grid; grid-template-columns:repeat(4,1fr); grid-auto-rows:150px; gap:12px; }
.gallery-grid a{ border-radius:var(--radius-sm); overflow:hidden; border:1px solid var(--line); position:relative; display:block; }
.gallery-grid a img{ width:100%; height:100%; object-fit:cover; transition:transform .35s; }
.gallery-grid a:hover img{ transform:scale(1.08); }
.gallery-grid a.tall{ grid-row:span 2; }
@media(max-width:900px){ .gallery-grid{ grid-template-columns:repeat(3,1fr); grid-auto-rows:120px; } }
@media(max-width:600px){ .gallery-grid{ grid-template-columns:repeat(2,1fr); } .gallery-grid a.tall{ grid-row:span 1; } }

/* =========================== AREAS SERVED =========================== */
.areas{ padding:78px 0; background:var(--bg-panel2); }
.areas-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:28px; }
.areas-col h4{ font-family:"Kanit",sans-serif; color:var(--gold-dim); font-size:.92rem; margin-bottom:12px; padding-bottom:8px; border-bottom:1px solid var(--line-lite); }
.areas-col ul{ display:grid; gap:8px; }
.areas-col a, .areas-col span{ font-size:.85rem; color:var(--ink-dim); }
.areas-col a:hover{ color:var(--gold-dim); }
@media(max-width:900px){ .areas-grid{ grid-template-columns:repeat(2,1fr); } }

/* =========================== REVIEWS =========================== */
.reviews{ padding:78px 0; }
.reviews-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.review-card{ padding:24px; }
.review-card .stars{ color:var(--gold); margin-bottom:10px; letter-spacing:2px; }
.review-card p{ font-size:.92rem; }
.review-card .who{ display:flex; align-items:center; gap:10px; margin-top:14px; }
.review-card .who .av{ width:36px; height:36px; border-radius:50%; background:linear-gradient(135deg,var(--red),var(--gold)); display:grid; place-items:center; font-family:"Kanit",sans-serif; font-weight:800; color:#fff; font-size:.85rem; }
.review-card .who b{ font-size:.85rem; color:#161409; }
.review-card .who span{ font-size:.75rem; color:var(--muted); display:block; }
@media(max-width:900px){ .reviews-grid{ grid-template-columns:1fr; } }

/* =========================== FAQ =========================== */
.faq{ padding:78px 0; background:var(--bg-panel2); }
.faq-list{ display:grid; gap:12px; max-width:820px; margin:0 auto; }
.faq-item{ background:#fff; border:1px solid var(--line); border-radius:var(--radius); overflow:hidden; }
.faq-q{ display:flex; align-items:center; justify-content:space-between; gap:14px; padding:18px 22px; cursor:pointer; font-family:"Kanit",sans-serif; font-weight:600; font-size:.98rem; color:#161409; }
.faq-q .plus{ flex:none; font-size:1.3rem; color:var(--gold-dim); transition:transform .2s; }
.faq-item.open .faq-q .plus{ transform:rotate(45deg); }
.faq-a{ max-height:0; overflow:hidden; transition:max-height .25s ease; padding:0 22px; }
.faq-item.open .faq-a{ padding-bottom:18px; }
.faq-a p{ font-size:.9rem; margin:0; }

/* =========================== ARTICLES TEASER =========================== */
.articles{ padding:78px 0; }
.articles-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.article-card{ padding:20px; }
.article-card .tag{ font-size:.68rem; color:var(--gold-dim); font-weight:700; letter-spacing:.06em; text-transform:uppercase; }
.article-card h3{ font-size:.95rem; margin:8px 0 6px; }
.article-card p{ font-size:.8rem; margin:0; }
@media(max-width:960px){ .articles-grid{ grid-template-columns:repeat(2,1fr); } }
@media(max-width:600px){ .articles-grid{ grid-template-columns:1fr; } }

/* =========================== FINAL CTA =========================== */
.final-cta{
  padding:70px 0; text-align:center;
  background:
    radial-gradient(ellipse 700px 400px at 50% 0%, rgba(211,162,51,.22), transparent 65%),
    var(--bg);
}
.final-cta h2{ font-size:clamp(1.6rem,3.6vw,2.3rem); }
.final-cta p{ max-width:560px; margin:0 auto 26px; }
.final-cta .actions{ display:flex; justify-content:center; gap:14px; flex-wrap:wrap; }

/* =========================== FOOTER =========================== */
.site-footer{ background:var(--bg-dark); color:#e8e2cf; border-top:1px solid #35301f; padding:56px 0 24px; }
.site-footer p, .site-footer span{ color:#b8b19a; }
.footer-grid{ display:grid; grid-template-columns:1.3fr 1fr 1fr 1fr; gap:36px; }
.footer-brand .brand{ margin-bottom:14px; }
.footer-brand .brand-name{ color:#fff; }
.footer-brand p{ font-size:.86rem; max-width:280px; }
.footer-col h4{ font-family:"Kanit",sans-serif; color:#fff; font-size:.92rem; margin-bottom:14px; }
.footer-col ul{ display:grid; gap:9px; }
.footer-col a{ font-size:.85rem; color:#b8b19a; }
.footer-col a:hover{ color:var(--gold-lite); }
.footer-bottom{ margin-top:40px; padding-top:20px; border-top:1px solid #35301f; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; font-size:.78rem; color:#938d76; }
@media(max-width:900px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
@media(max-width:560px){ .footer-grid{ grid-template-columns:1fr; } }

/* =========================== SCROLL REVEAL =========================== */
.reveal{ opacity:0; transform:translateY(18px); transition:opacity .6s ease, transform .6s ease; }
.reveal.in{ opacity:1; transform:none; }

/* =========================== BREADCRUMB / ARTICLE =========================== */
.breadcrumb{ padding:18px 0; font-size:.82rem; color:var(--muted); }
.breadcrumb a{ color:var(--muted); }
.breadcrumb a:hover{ color:var(--gold-dim); }
.breadcrumb .sep{ margin:0 8px; opacity:.5; }

.article-hero{ padding:20px 0 40px; }
.article-hero .eyebrow{ margin-bottom:14px; }
.article-hero h1{ font-size:clamp(1.7rem,4vw,2.5rem); max-width:820px; }
.article-hero .meta{ font-size:.82rem; color:var(--muted); margin-top:10px; }

.article-body{ padding-bottom:60px; }
.article-layout{ display:grid; grid-template-columns:2.1fr 1fr; gap:44px; align-items:flex-start; }
.article-content h2{ font-size:1.35rem; margin-top:1.6em; }
.article-content h3{ font-size:1.08rem; margin-top:1.3em; color:var(--gold-dim); }
.article-content p{ font-size:.98rem; }
.article-content ul{ display:grid; gap:8px; margin:0 0 1.2em; padding-left:0; }
.article-content ul li{ font-size:.94rem; color:var(--ink-dim); padding-left:26px; position:relative; }
.article-content ul li::before{ content:"✓"; position:absolute; left:0; color:var(--ok); font-weight:800; }
.article-content .cover{ border-radius:var(--radius-lg); overflow:hidden; margin:0 0 28px; border:1px solid var(--line-lite); aspect-ratio:16/9; }
.article-content .cover img{ width:100%; height:100%; object-fit:cover; }
.article-content .inline-img{ border-radius:var(--radius); overflow:hidden; margin:24px 0; border:1px solid var(--line); aspect-ratio:16/9; }
.article-content .inline-img img{ width:100%; height:100%; object-fit:cover; }

.article-sidebar{ position:sticky; top:90px; display:grid; gap:18px; }
.side-card{ background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:22px; }
.side-card h4{ font-family:"Kanit",sans-serif; font-size:.98rem; margin-bottom:12px; color:#161409; }
.side-card .btn{ margin-bottom:10px; }
.side-card ul{ display:grid; gap:8px; }
.side-card ul a{ font-size:.84rem; color:var(--ink-dim); }
.side-card ul a:hover{ color:var(--gold-dim); }

@media(max-width:900px){
  .article-layout{ grid-template-columns:1fr; }
  .article-sidebar{ position:static; }
}

/* =========================== MOBILE NAV =========================== */
@media(max-width:900px){
  .nav-links{ position:fixed; inset:64px 0 0 0; background:var(--bg); flex-direction:column; align-items:flex-start; padding:28px 24px; display:none; gap:0; overflow-y:auto; border-top:1px solid var(--line); }
  .nav-links.open{ display:flex; }
  .nav-links a{ padding:14px 0; width:100%; border-bottom:1px solid var(--line); font-size:1.02rem; }
  .nav-toggle{ display:block; }
  .header-phone{ display:none; }
}
@media(max-width:560px){ .header-cta .btn-line span.lbl{ display:none; } }