/* ==========================================================================
   เฮียซอ เชียงกง — รับซื้อซากรถเก่า
   Automotive / AI theme — navy + gold pastel, red CTA, green LINE, FB blue
   ========================================================================== */

:root{
  --navy-950:#060E1D;
  --navy-900:#0B1F3A;
  --navy-800:#142C4F;
  --navy-700:#1B3A63;
  --navy-600:#28527F;
  --gold:#D9B26A;
  --gold-deep:#B8923F;
  --gold-pale:#FBF1DC;
  --gold-pale-2:#F3E2B8;
  --white:#FFFFFF;
  --ink:#1A2233;
  --ink-soft:#57607A;
  --steel:#8C93A6;
  --red:#E63946;
  --red-dark:#C62839;
  --green:#06C755;
  --green-dark:#04A649;
  --fb-blue:#1877F2;
  --fb-blue-dark:#125FCB;
  --radius:10px;
  --radius-lg:16px;
  --shadow-lg:0 20px 48px rgba(6,14,29,.28);
  --shadow-sm:0 6px 18px rgba(6,14,29,.14);
  --maxw:1200px;
  --font-display:'Kanit',sans-serif;
  --font-body:'Noto Sans Thai',sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--white);
  line-height:1.75;
  -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:var(--font-display);color:var(--navy-900);line-height:1.3;margin:0 0 .5em;}
h1{font-weight:800;}
h2{font-weight:700;}
h3{font-weight:600;}
p{margin:0 0 1em;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px;}
:focus-visible{outline:3px solid var(--red);outline-offset:2px;}
@media (prefers-reduced-motion:reduce){*{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important;scroll-behavior:auto !important;}}

/* ---------- circuit / tech texture ---------- */
.circuit-bg{
  background-image:
    radial-gradient(circle at 15% 20%, rgba(217,178,106,.10) 0, transparent 40%),
    radial-gradient(circle at 85% 75%, rgba(217,178,106,.08) 0, transparent 45%),
    repeating-linear-gradient(90deg, rgba(217,178,106,.05) 0 1px, transparent 1px 80px),
    repeating-linear-gradient(0deg, rgba(217,178,106,.05) 0 1px, transparent 1px 80px);
}

/* ---------- top utility bar ---------- */
.topbar{background:var(--navy-950);color:var(--gold-pale);font-size:.85rem;}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;padding:6px 20px;flex-wrap:wrap;gap:6px;}
.topbar a{color:var(--gold-pale);}
.topbar .tb-phone{font-weight:700;letter-spacing:.03em;color:var(--gold);}
.topbar .tb-phone::before{content:"☎ ";}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:var(--white);border-bottom:3px solid var(--gold);box-shadow:var(--shadow-sm);}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;gap:16px;}
.brand{display:flex;align-items:center;gap:12px;min-width:0;}
.brand img{height:52px;width:auto;flex-shrink:0;border-radius:8px;}
.brand-text{display:flex;flex-direction:column;line-height:1.2;}
.brand-text strong{font-family:var(--font-display);font-size:1.15rem;color:var(--navy-900);font-weight:800;}
.brand-text span{font-size:.72rem;color:var(--ink-soft);letter-spacing:.02em;}

nav.main-nav{display:flex;align-items:center;gap:24px;}
nav.main-nav a{font-weight:600;font-size:.94rem;color:var(--navy-800);position:relative;padding:6px 2px;}
nav.main-nav a::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--red);transition:width .2s;}
nav.main-nav a:hover::after,nav.main-nav a:focus-visible::after{width:100%;}

.header-cta{display:flex;align-items:center;gap:10px;}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--font-display);font-weight:600;font-size:.95rem;padding:11px 22px;border-radius:var(--radius);border:2px solid transparent;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s;white-space:nowrap;}
.btn:hover{transform:translateY(-2px);}
.btn-call{background:var(--red);color:#fff;box-shadow:0 6px 16px rgba(230,57,70,.35);}
.btn-call:hover{background:var(--red-dark);}
.btn-line{background:var(--green);color:#fff;box-shadow:0 6px 16px rgba(6,199,85,.35);}
.btn-line:hover{background:var(--green-dark);}
.btn-fb{background:var(--fb-blue);color:#fff;box-shadow:0 6px 16px rgba(24,119,242,.35);}
.btn-fb:hover{background:var(--fb-blue-dark);}
.btn-outline{background:transparent;border-color:var(--navy-700);color:var(--navy-800);}
.btn-outline:hover{background:var(--navy-700);color:#fff;}
.btn-gold{background:var(--gold);color:var(--navy-950);}
.btn-gold:hover{background:var(--gold-deep);color:#fff;}
.btn-sm{padding:8px 16px;font-size:.85rem;}
.btn-lg{padding:16px 30px;font-size:1.05rem;}

.nav-toggle{display:none;background:none;border:2px solid var(--navy-700);border-radius:var(--radius);width:44px;height:44px;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:5px;}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--navy-800);}

/* ---------- FB banner strip ---------- */
.fb-strip{background:linear-gradient(90deg,var(--fb-blue) 0%,var(--fb-blue-dark) 100%);color:#fff;}
.fb-strip .wrap{display:flex;align-items:center;justify-content:center;gap:14px;padding:12px 20px;flex-wrap:wrap;text-align:center;}
.fb-strip .fb-text{font-size:.92rem;font-weight:600;}
.fb-strip .fb-text b{font-family:var(--font-display);font-weight:800;}
.fb-strip .btn{background:#fff;color:var(--fb-blue);padding:8px 18px;font-size:.85rem;}
.fb-strip .btn:hover{background:var(--gold-pale);}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;background:linear-gradient(160deg,var(--navy-950) 0%,var(--navy-900) 55%,var(--navy-700) 130%);color:#fff;padding:56px 0 96px;}
.hero .circuit-bg{position:absolute;inset:0;}
.hero-inner{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;}
.eyebrow{display:inline-flex;align-items:center;gap:8px;background:rgba(217,178,106,.14);border:1px solid rgba(217,178,106,.4);padding:6px 14px;border-radius:999px;font-size:.8rem;letter-spacing:.05em;margin-bottom:18px;color:var(--gold);font-weight:600;}
.eyebrow::before{content:"🚗";}
.hero h1{color:#fff;font-size:clamp(2rem,4.2vw,3.1rem);margin-bottom:.4em;}
.hero h1 em{font-style:normal;color:var(--gold);}
.hero-sub{font-size:1.06rem;color:#CBD3E1;max-width:54ch;margin-bottom:1.6em;}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:22px;}
.hero-fb{display:inline-flex;align-items:center;gap:10px;margin-bottom:24px;}
.hero-phone{display:inline-flex;align-items:center;gap:10px;color:#fff;font-family:var(--font-display);font-size:1.35rem;font-weight:700;letter-spacing:.02em;}
.hero-phone small{display:block;font-family:var(--font-body);font-weight:400;font-size:.72rem;color:#9AA5BD;}
.hero-stats{display:flex;gap:26px;margin-top:10px;flex-wrap:wrap;}
.hero-stats div{border-left:3px solid var(--gold);padding-left:12px;}
.hero-stats b{display:block;font-family:var(--font-display);font-size:1.5rem;color:var(--gold);}
.hero-stats span{font-size:.78rem;color:#9AA5BD;}

/* signature: automotive gauge badge */
.hero-visual{position:relative;display:flex;justify-content:center;align-items:center;min-height:280px;}
.gauge{position:relative;width:236px;height:236px;border-radius:50%;background:radial-gradient(circle at 50% 40%,var(--navy-800) 0%,var(--navy-950) 100%);box-shadow:var(--shadow-lg),inset 0 0 0 2px rgba(217,178,106,.35);display:flex;align-items:center;justify-content:center;animation:gaugefloat 6s ease-in-out infinite;}
.gauge::before{content:"";position:absolute;inset:14px;border-radius:50%;border:2px dashed rgba(217,178,106,.45);}
.gauge-inner{width:170px;height:170px;border-radius:50%;background:var(--navy-950);border:3px solid var(--gold);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;font-family:var(--font-display);padding:10px;}
.gauge-inner .ic{font-size:1.8rem;margin-bottom:2px;}
.gauge-inner .big{font-size:1.55rem;font-weight:800;color:var(--gold);line-height:1;}
.gauge-inner .mid{font-size:.82rem;font-weight:700;color:#fff;margin-top:6px;}
.gauge-inner .small{font-size:.62rem;color:#9AA5BD;margin-top:2px;letter-spacing:.04em;}
@keyframes gaugefloat{0%,100%{transform:translateY(0) rotate(-2deg);}50%{transform:translateY(-9px) rotate(1deg);}}

.hero-wave{position:absolute;left:0;right:0;bottom:-1px;line-height:0;}

/* ---------- section shell ---------- */
.section{padding:70px 0;}
.section-alt{background:var(--gold-pale);}
.section-dark{background:var(--navy-950);color:#CBD3E1;}
.section-dark h2{color:#fff;}
.section-head{max-width:680px;margin:0 auto 44px;text-align:center;}
.section-head .kicker{display:inline-block;font-family:var(--font-display);font-size:.8rem;letter-spacing:.11em;color:var(--red);font-weight:700;margin-bottom:10px;text-transform:uppercase;}
.section-head h2{font-size:clamp(1.5rem,3vw,2.1rem);}
.section-head p{color:var(--ink-soft);}
.section-dark .section-head p{color:#9AA5BD;}

/* ---------- grid & cards ---------- */
.grid{display:grid;gap:22px;}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
.grid-5{grid-template-columns:repeat(5,1fr);}

.card{background:var(--white);border:1px solid var(--gold-pale-2);border-radius:var(--radius-lg);padding:26px 22px;box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s,border-color .2s;position:relative;overflow:hidden;}
.card::before{content:"";position:absolute;top:0;left:0;width:4px;height:100%;background:var(--navy-700);}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--gold);}
.card:hover::before{background:var(--red);}
.card .icon{width:52px;height:52px;border-radius:12px;background:var(--gold-pale);display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:14px;color:var(--navy-800);}
.card h3{font-size:1.02rem;margin-bottom:.4em;}
.card p{font-size:.92rem;color:var(--ink-soft);margin-bottom:.6em;}
.card a.more{font-size:.85rem;font-weight:700;color:var(--red);}
.card a.more::after{content:" →";}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;counter-reset:step;position:relative;}
.step{padding:0 18px;position:relative;text-align:center;}
.step-num{counter-increment:step;width:56px;height:56px;border-radius:50%;background:var(--navy-950);color:var(--gold);display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-weight:700;font-size:1.2rem;margin:0 auto 14px;border:3px solid var(--red);position:relative;z-index:2;}
.step-num::before{content:counter(step);}
.steps .step:not(:last-child)::after{content:"";position:absolute;top:28px;left:calc(50% + 28px);width:calc(100% - 56px);height:2px;background:repeating-linear-gradient(90deg,var(--gold) 0 8px,transparent 8px 14px);}
.step h3{font-size:1rem;}
.step p{font-size:.85rem;color:var(--ink-soft);}

/* ---------- gallery ---------- */
.gallery{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;}
.gallery a{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:1/1;display:block;box-shadow:var(--shadow-sm);}
.gallery img{width:100%;height:100%;object-fit:cover;transition:transform .35s;}
.gallery a::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 50%,rgba(6,14,29,.6) 100%);opacity:0;transition:opacity .25s;}
.gallery a:hover img{transform:scale(1.08);}
.gallery a:hover::after{opacity:1;}

/* ---------- reviews strip ---------- */
.reviews{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;}
.reviews a{display:block;border-radius:var(--radius);overflow:hidden;border:1px solid var(--gold-pale-2);box-shadow:var(--shadow-sm);background:#fff;}
.reviews img{width:100%;aspect-ratio:4/3;object-fit:cover;}

/* ---------- FAQ ---------- */
.faq-list{max-width:820px;margin:0 auto;}
.faq-item{border-bottom:1px solid var(--gold-pale-2);}
.faq-q{width:100%;text-align:left;background:none;border:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:20px 4px;font-family:var(--font-display);font-weight:600;font-size:1.02rem;color:var(--navy-900);}
.faq-q::after{content:"+";font-size:1.4rem;color:var(--red);flex-shrink:0;transition:transform .25s;}
.faq-item.open .faq-q::after{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;font-size:.94rem;color:var(--ink-soft);}
.faq-item.open .faq-a{max-height:400px;}
.faq-a p{padding:0 4px 18px;margin:0;}

/* ---------- CTA band ---------- */
.cta-band{background:var(--red);color:#fff;padding:46px 0;text-align:center;background-image:repeating-linear-gradient(135deg,rgba(255,255,255,.06) 0 12px,transparent 12px 24px);}
.cta-band h2{color:#fff;margin-bottom:.3em;}
.cta-band p{color:#FBDADA;margin-bottom:1.3em;}
.cta-band .btn-line,.cta-band .btn-call{background:#fff;color:var(--red);}
.cta-band .btn-line{color:var(--green-dark);}
.cta-band .btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:start;}
.contact-info .item{display:flex;gap:14px;margin-bottom:22px;}
.contact-info .item .ic{width:46px;height:46px;border-radius:12px;background:var(--navy-900);color:var(--gold);display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:1.2rem;}
.contact-info .item h3{font-size:1rem;margin-bottom:.2em;}
.contact-info .item p{margin:0;color:var(--ink-soft);font-size:.92rem;}
.contact-info .item a{color:var(--navy-900);font-weight:700;}

form.contact-form{background:#fff;border:1px solid var(--gold-pale-2);border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow-sm);}
form.contact-form label{display:block;font-size:.85rem;font-weight:700;margin-bottom:6px;color:var(--navy-900);}
form.contact-form input,form.contact-form textarea{width:100%;padding:11px 13px;border:1px solid var(--gold-pale-2);border-radius:var(--radius);margin-bottom:16px;font-family:var(--font-body);font-size:.95rem;background:var(--gold-pale);}
form.contact-form input:focus,form.contact-form textarea:focus{outline:2px solid var(--navy-700);background:#fff;}
form.contact-form .btn{width:100%;}

/* ---------- article internal links ---------- */
.article-links{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;}
.article-links a{display:block;padding:14px 16px;background:#fff;border:1px solid var(--gold-pale-2);border-radius:var(--radius);font-size:.9rem;font-weight:600;color:var(--navy-900);transition:border-color .2s,transform .2s;}
.article-links a:hover{border-color:var(--red);transform:translateX(3px);}

/* ---------- footer ---------- */
footer.site-footer{background:var(--navy-950);color:#9AA5BD;padding:56px 0 20px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;margin-bottom:40px;}
.footer-grid h4{color:var(--gold);font-size:.95rem;margin-bottom:16px;}
.footer-grid ul li{margin-bottom:9px;}
.footer-grid a{font-size:.87rem;color:#9AA5BD;}
.footer-grid a:hover{color:#fff;}
.footer-brand img{height:44px;margin-bottom:12px;border-radius:8px;}
.footer-brand p{font-size:.85rem;line-height:1.7;color:#7C87A0;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:18px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:.78rem;color:#6C7690;}

/* ---------- floating action buttons ---------- */
.float-actions{position:fixed;right:18px;bottom:18px;z-index:200;display:flex;flex-direction:column;gap:10px;}
.float-actions a{width:54px;height:54px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.4rem;box-shadow:0 8px 20px rgba(0,0,0,.3);}
.float-actions .fa-call{background:var(--red);}
.float-actions .fa-line{background:var(--green);}
.float-actions .fa-fb{background:var(--fb-blue);}

/* ---------- breadcrumb ---------- */
.breadcrumb{font-size:.82rem;color:var(--ink-soft);padding:16px 0;}
.breadcrumb a{color:var(--navy-700);font-weight:600;}
.breadcrumb span{margin:0 6px;color:var(--gold-deep);}

/* ---------- article page ---------- */
.article-hero{background:var(--navy-950);color:#fff;padding:40px 0 50px;}
.article-hero .kicker{color:var(--gold);font-family:var(--font-display);font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;}
.article-hero h1{color:#fff;font-size:clamp(1.6rem,3.4vw,2.3rem);margin:.4em 0;}
.article-hero p{color:#CBD3E1;max-width:70ch;}
.article-body{max-width:820px;margin:0 auto;}
.article-body h2{margin-top:1.6em;font-size:1.4rem;border-left:4px solid var(--red);padding-left:14px;}
.article-body h3{margin-top:1.2em;font-size:1.1rem;color:var(--navy-700);}
.article-body p{color:var(--ink-soft);}
.article-body img{border-radius:var(--radius);margin:18px 0;box-shadow:var(--shadow-sm);}
.article-body figure{margin:22px 0;}
.article-body figcaption{font-size:.8rem;color:var(--steel);text-align:center;margin-top:6px;}
.img-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0;}
.article-cta{background:var(--gold-pale);border:1px dashed var(--gold);border-radius:var(--radius-lg);padding:24px;text-align:center;margin:36px 0;}
.article-cta .btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:12px;}
.tag-row{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 0;}
.tag{background:var(--gold-pale);color:var(--navy-800);font-size:.78rem;padding:5px 12px;border-radius:999px;font-weight:600;}

/* ---------- articles index ---------- */
.article-card-list{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;}
.article-filter{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-bottom:32px;}
.article-filter span{background:var(--gold-pale);color:var(--navy-800);font-size:.82rem;font-weight:600;padding:7px 16px;border-radius:999px;}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .hero-inner{grid-template-columns:1fr;}
  .hero-visual{order:-1;min-height:190px;}
  .gauge{width:160px;height:160px;}
  .gauge-inner{width:120px;height:120px;}
  .gauge-inner .big{font-size:1.1rem;}
  .gauge-inner .mid{font-size:.68rem;}
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr);}
  .grid-5{grid-template-columns:repeat(3,1fr);}
  .steps{grid-template-columns:repeat(2,1fr);row-gap:36px;}
  .steps .step:nth-child(2)::after{display:none;}
  .contact-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .article-links{grid-template-columns:1fr;}
  .article-card-list{grid-template-columns:1fr;}
  .img-row{grid-template-columns:1fr;}
}
@media (max-width:720px){
  nav.main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;gap:0;border-bottom:3px solid var(--gold);box-shadow:var(--shadow-lg);}
  nav.main-nav.open{display:flex;}
  nav.main-nav a{padding:14px 20px;border-bottom:1px solid var(--gold-pale);}
  .site-header .wrap{position:relative;}
  .nav-toggle{display:flex;}
  .header-cta .btn-outline{display:none;}
  .topbar .tb-note{display:none;}
  .grid-5{grid-template-columns:repeat(2,1fr);}
  .gallery{grid-template-columns:repeat(2,1fr);}
  .reviews{grid-template-columns:repeat(2,1fr);}
  .hero{padding:36px 0 66px;}
  .hero-stats{gap:18px;}
  .fb-strip .wrap{flex-direction:column;gap:8px;}
}