/* สามทหารการยางออโต้แม็กซ์ — Design System
   Podia papercraft structure × brand palette ดำ–ขาว–เหลือง */
:root{
  --ink:#0D0F12; --ink-2:#121417; --paper:#FFFFFF; --fog:#F6F7F8;
  --yellow:#F5C400; --yellow-dark:#D5A900; --muted:#656B73; --line:#E7E8EA;
  --cream:#FBF3D6;
  --font:'Prompt','Sarabun','Noto Sans Thai',ui-sans-serif,system-ui,sans-serif;
  --r-card:24px; --r-feature:28px; --r-btn:12px; --r-badge:16px; --r-input:10px;
  --maxw:1200px; --sec:80px; --pad-card:32px;
  --shadow:0 2px 12px rgba(13,15,18,.06);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);font-size:16px;line-height:1.6;color:var(--ink);background:var(--fog)}
img,svg{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
p a,li a,td a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--yellow);text-decoration-thickness:2px;text-underline-offset:3px}
:focus-visible{outline:3px solid var(--yellow-dark);outline-offset:2px;border-radius:4px}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--yellow);color:var(--ink);padding:10px 16px;z-index:200;border-radius:0 0 8px 0}
.skip-link:focus{left:0}
h1,h2,h3,h4{line-height:1.15;font-weight:700}
h1{font-size:clamp(34px,5.4vw,58px);letter-spacing:-.03em;line-height:1.05}
h2{font-size:clamp(26px,3.4vw,36px);letter-spacing:-.02em}
h3{font-size:clamp(19px,2.2vw,23px);letter-spacing:-.01em}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.section{padding:var(--sec) 0}
.section-white{background:var(--paper)}
.section-dark{background:var(--ink);color:var(--paper)}
.section-dark .card,.section-dark .card-fog,.section-dark .promo-note,.section-dark .service-card,.section-dark .gallery-card{color:var(--ink)}
.section-dark .card .muted,.section-dark .promo-note .muted{color:var(--muted)}
.section-dark .muted{color:#B9BEC5}
.muted{color:var(--muted)}
.eyebrow{display:block;font-size:12px;font-weight:500;letter-spacing:.12em;text-transform:uppercase;color:var(--ink);margin-bottom:12px}
.eyebrow::before{content:"";display:inline-block;width:22px;height:4px;background:var(--yellow);border-radius:2px;margin-right:10px;vertical-align:middle}
.section-dark .eyebrow{color:var(--yellow)}
.section-head{max-width:720px;margin-bottom:40px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head p{margin-top:12px;color:var(--muted);font-size:18px}
.section-dark .section-head p{color:#B9BEC5}

/* Top bar */
.topbar{background:var(--ink);color:#D6D9DD;font-size:13px}
.topbar-inner{display:flex;gap:20px;justify-content:space-between;align-items:center;padding-top:7px;padding-bottom:7px;flex-wrap:wrap}
.topbar a{color:var(--yellow);font-weight:500}
@media(max-width:640px){.topbar-loc{display:none}}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:24px;padding-top:12px;padding-bottom:12px}
.brand{display:flex;align-items:center;gap:10px}
.brand-logo{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:12px;background:var(--ink);color:var(--yellow);font-weight:700;font-size:15px;letter-spacing:.02em;flex-shrink:0}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-size:18px}
.brand-text small{font-size:10.5px;letter-spacing:.14em;color:var(--muted);font-weight:500}
.main-nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.main-nav a{font-weight:500;font-size:15px;padding:8px 12px;border-radius:10px;color:var(--ink)}
.main-nav a:hover{background:var(--fog)}
.main-nav a.active{background:var(--ink);color:var(--yellow)}
.header-cta{white-space:nowrap}
.nav-toggle{display:none;background:none;border:2px solid var(--line);border-radius:10px;width:44px;height:44px;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:5px}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--ink);transition:transform .2s}
@media(max-width:1020px){
  .main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--paper);border-bottom:1px solid var(--line);flex-direction:column;padding:12px 20px;gap:2px}
  .main-nav.open{display:flex}
  .main-nav a{padding:12px}
  .nav-toggle{display:flex;margin-left:auto}
  .header-cta{margin-left:auto;display:none}
  .nav-toggle{margin-left:0}
  .header-inner{justify-content:space-between}
}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--font);font-weight:500;font-size:16px;padding:14px 24px;border-radius:var(--r-btn);border:0;cursor:pointer;transition:background .15s,transform .15s;min-height:48px}
.btn:hover{transform:translateY(-1px)}
.btn-yellow{background:var(--yellow);color:var(--ink)}
.btn-yellow:hover{background:var(--yellow-dark)}
.btn-dark{background:var(--ink);color:var(--paper)}
.btn-dark:hover{background:var(--ink-2)}
.btn-outline{background:transparent;border:2px solid var(--ink);color:var(--ink)}
.btn-outline:hover{background:var(--ink);color:var(--paper)}
.section-dark .btn-outline{border-color:var(--paper);color:var(--paper)}
.section-dark .btn-outline:hover{background:var(--paper);color:var(--ink)}
.btn-ghost{background:none;border:0;color:var(--ink);font-weight:500;padding:8px 0;min-height:44px}
.btn-ghost::after{content:"→";margin-left:6px;color:var(--yellow-dark);transition:transform .15s}
.btn-ghost:hover::after{transform:translateX(4px)}
.btn-row{display:flex;gap:12px;flex-wrap:wrap}

/* Badges */
.badge{display:inline-block;background:var(--fog);border-radius:var(--r-badge);padding:6px 14px;font-size:12.5px;font-weight:500;color:var(--ink)}
.badge-yellow{background:var(--yellow);color:var(--ink)}
.badge-line{background:var(--paper);border:1px solid var(--line)}

/* Cards */
.card{background:var(--paper);border-radius:var(--r-card);padding:var(--pad-card);box-shadow:var(--shadow)}
.card-fog{background:var(--fog);box-shadow:none}
.card h3{margin-bottom:8px}
.grid{display:grid;gap:20px}
.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-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

/* Hero */
.hero{position:relative;overflow:hidden;padding:72px 0 88px}
.hero-inner{position:relative;z-index:1;max-width:780px}
.hero .lead{font-size:clamp(17px,2vw,19px);color:var(--muted);margin:20px 0 28px;max-width:640px}
.hero-dark{background:var(--ink);color:var(--paper)}
.hero-dark .lead{color:#C4C8CE}
.blob{position:absolute;border-radius:52% 48% 55% 45%/55% 45% 55% 45%;pointer-events:none}
.blob-yellow{background:var(--yellow);opacity:.85}
.blob-cream{background:var(--cream);opacity:.7}
.blob-gray{background:#2A2E34;opacity:.6}
.trust-points{display:flex;gap:10px;flex-wrap:wrap;margin-top:28px}
.trust-points .badge{background:rgba(255,255,255,.08);color:#E8EAEC;border:1px solid rgba(255,255,255,.14)}
.trust-points .badge::before{content:"✓";color:var(--yellow);margin-right:7px;font-weight:700}

/* Service card */
.service-card{display:flex;flex-direction:column;background:var(--paper);border-radius:var(--r-card);padding:28px;box-shadow:var(--shadow);transition:transform .15s}
.service-card:hover{transform:translateY(-3px)}
.service-card .icon{width:56px;height:56px;border-radius:16px;background:var(--yellow);display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:16px}
.service-card p{color:var(--muted);font-size:15px;flex:1;margin:6px 0 16px}
.service-card .links{display:flex;gap:14px;flex-wrap:wrap;font-size:14.5px;font-weight:500}
.service-card .links a{color:var(--ink);border-bottom:2px solid var(--yellow)}
.service-card .links a:hover{color:var(--yellow-dark)}

/* Feature split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split-visual{position:relative;background:var(--ink);border-radius:var(--r-feature);min-height:320px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.split-visual.fog{background:var(--fog)}
@media(max-width:860px){.split{grid-template-columns:1fr}.split-visual{min-height:240px}}

/* Steps */
.steps{counter-reset:step}
.step{position:relative;padding-left:0}
.step .num{display:inline-flex;width:48px;height:48px;border-radius:14px;background:var(--yellow);color:var(--ink);font-weight:700;font-size:20px;align-items:center;justify-content:center;margin-bottom:14px}
.step h3{font-size:19px}
.step p{color:var(--muted);font-size:15px;margin-top:6px}

/* FAQ */
.faq{max-width:820px}
.faq details{background:var(--paper);border:1px solid var(--line);border-radius:16px;margin-bottom:12px;overflow:hidden}
.faq summary{cursor:pointer;font-weight:500;padding:18px 22px;list-style:none;display:flex;justify-content:space-between;gap:16px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;color:var(--yellow-dark);font-weight:700;flex-shrink:0}
.faq details[open] summary::after{content:"–"}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq .faq-a{padding:16px 22px 20px;color:var(--muted)}
.section-dark .faq details{background:var(--ink-2);border-color:#23262B}
.section-dark .faq .faq-a{color:#B9BEC5}

/* Tables */
.table-wrap{overflow-x:auto;border-radius:16px;border:1px solid var(--line)}
table{width:100%;border-collapse:collapse;background:var(--paper);font-size:15px;min-width:520px}
th{background:var(--ink);color:var(--paper);text-align:left;padding:12px 16px;font-weight:500}
td{padding:12px 16px;border-top:1px solid var(--line);vertical-align:top}
tbody tr:hover{background:var(--fog)}

/* Checklist */
.checklist{list-style:none;display:grid;gap:10px}
.checklist li{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:12px 16px 12px 44px;position:relative}
.checklist li::before{content:"✓";position:absolute;left:16px;top:11px;color:var(--ink);background:var(--yellow);width:20px;height:20px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700}

/* Forms */
.form-grid{display:grid;gap:16px}
label{font-weight:500;font-size:14.5px;display:block;margin-bottom:6px}
input,select,textarea{width:100%;font-family:var(--font);font-size:16px;padding:12px 14px;border:1.5px solid var(--line);border-radius:var(--r-input);background:var(--paper);color:var(--ink)}
input:focus,select:focus,textarea:focus{border-color:var(--yellow-dark);outline:none}
.consent{display:flex;gap:10px;align-items:flex-start;font-size:13.5px;color:var(--muted)}
.consent input{width:auto;margin-top:3px}

/* Gallery */
.gallery-card{background:var(--paper);border-radius:var(--r-card);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column}
.gallery-card .thumb{aspect-ratio:4/3;background:var(--fog);display:flex;align-items:center;justify-content:center;overflow:hidden}
.gallery-card .thumb img{width:100%;height:100%;object-fit:cover}
.gallery-card .body{padding:20px 22px}
.gallery-card .body p{font-size:14.5px;color:var(--muted);margin:6px 0 10px}
.gallery-card .meta{font-size:12.5px;color:var(--muted)}

/* Breadcrumb */
.breadcrumb{font-size:13.5px;color:var(--muted);padding:16px 0 0}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--ink)}
.breadcrumb span[aria-current]{color:var(--ink);font-weight:500}

/* Article */
.article{max-width:760px;margin:0 auto}
.article-hero{background:var(--paper);border-radius:var(--r-feature);overflow:hidden;margin-bottom:32px}
.article h1{font-size:clamp(28px,4vw,42px)}
.article-meta{display:flex;gap:14px;flex-wrap:wrap;font-size:13.5px;color:var(--muted);margin:16px 0 28px}
.article h2{margin:44px 0 16px;padding-top:8px}
.article h3{margin:28px 0 12px}
.article p{margin-bottom:16px}
.article ul,.article ol{margin:0 0 16px 24px}
.article li{margin-bottom:8px}
.article .table-wrap{margin:20px 0}
.answer-box{background:var(--cream);border:1px solid #EAD98F;border-radius:16px;padding:20px 24px;margin:24px 0}
.answer-box strong{display:block;margin-bottom:6px}
.warn-box{background:var(--fog);border-left:5px solid var(--yellow);border-radius:0 14px 14px 0;padding:18px 22px;margin:24px 0}
.warn-box strong{display:block;margin-bottom:4px}
.toc{background:var(--paper);border:1px solid var(--line);border-radius:16px;padding:20px 24px;margin:24px 0}
.toc p{font-weight:700;margin-bottom:10px}
.toc ol{margin-left:22px}
.toc li{margin-bottom:6px}
.toc a{text-decoration:none;color:var(--ink)}
.toc a:hover{color:var(--yellow-dark)}
.article-cta{background:var(--ink);color:var(--paper);border-radius:var(--r-card);padding:32px;margin:44px 0 0;text-align:center}
.article-cta h2{margin:0 0 10px;color:var(--paper)}
.article-cta p{color:#B9BEC5}
.related{margin-top:48px}
.related h2{font-size:22px;margin-bottom:16px}
.related ul{list-style:none;margin:0}
.related li{margin-bottom:10px}

/* Footer */
.site-footer{background:var(--ink);color:#C4C8CE;margin-bottom:64px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px;padding-top:56px;padding-bottom:36px;font-size:14.5px}
.footer-grid a{display:block;padding:5px 0;color:#C4C8CE}
.footer-grid a:hover{color:var(--yellow)}
.footer-head{color:var(--paper);font-weight:700;margin-bottom:10px}
.brand-footer{display:flex;align-items:center;gap:10px;color:var(--paper);margin-bottom:12px}
.brand-footer .brand-logo{background:var(--yellow);color:var(--ink)}
.footer-grid p{margin-bottom:10px}
.footer-bottom{border-top:1px solid #23262B;padding-top:20px;padding-bottom:24px;font-size:13px;color:#8A9098}
@media(max-width:900px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.footer-grid{grid-template-columns:1fr}}
@media(min-width:769px){.site-footer{margin-bottom:0}}

/* Mobile CTA bar */
.mobile-cta{position:fixed;bottom:0;left:0;right:0;z-index:110;display:none;background:var(--ink);border-top:2px solid var(--yellow)}
.mobile-cta a{flex:1;text-align:center;padding:13px 6px;color:var(--paper);font-size:13.5px;font-weight:500}
.mobile-cta a:first-child{background:var(--yellow);color:var(--ink);font-weight:700}
@media(max-width:768px){.mobile-cta{display:flex}}

/* Utilities */
.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mt-32{margin-top:32px}.mt-40{margin-top:40px}.mt-56{margin-top:56px}
.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}.mb-32{margin-bottom:32px}.mb-40{margin-bottom:40px}
.center{text-align:center}
.brand-strip{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.brand-strip .badge{font-size:15px;padding:10px 22px;background:var(--paper);border:1px solid var(--line);font-weight:700;letter-spacing:.04em}
.map-embed{border:0;width:100%;height:380px;border-radius:var(--r-card)}
.promo-note{background:var(--cream);border-radius:16px;padding:18px 24px;border:1px solid #EAD98F}

/* Logo image */
.brand-img{width:52px;height:52px;flex-shrink:0}
.brand-footer .brand-img{width:56px;height:56px;background:#fff;border-radius:50%;padding:2px}

/* Outline buttons on dark hero / article CTA */
.hero-dark .btn-outline,.article-cta .btn-outline{border-color:rgba(255,255,255,.9);color:#fff}
.hero-dark .btn-outline:hover,.article-cta .btn-outline:hover{background:#fff;color:var(--ink)}

/* Floating contact widget */
.contact-widget{position:fixed;right:18px;bottom:24px;z-index:120;display:flex;flex-direction:column;align-items:flex-end}
.cw-toggle{width:58px;height:58px;border-radius:50%;background:var(--yellow);border:0;font-size:25px;cursor:pointer;box-shadow:0 4px 18px rgba(13,15,18,.3);transition:transform .15s}
.cw-toggle:hover{transform:scale(1.06)}
.cw-menu{display:flex;flex-direction:column;gap:10px;margin-bottom:12px;align-items:flex-end}
.cw-menu[hidden]{display:none}
.cw-menu a{display:flex;align-items:center;gap:10px;background:var(--paper);border:1px solid var(--line);border-radius:999px;padding:11px 20px;font-weight:500;font-size:14.5px;color:var(--ink);box-shadow:0 4px 14px rgba(13,15,18,.16)}
.cw-menu a:hover{background:var(--fog)}
.cw-dot{width:12px;height:12px;border-radius:50%;flex-shrink:0}
.ic{width:22px;height:22px;flex-shrink:0}
.ic-s{width:18px;height:18px;flex-shrink:0;vertical-align:-4px;display:inline-block}
.mobile-cta a{display:inline-flex;align-items:center;justify-content:center;gap:6px}
.btn .ic{width:20px;height:20px}

/* Product recommendation cards (เตรียมไว้สำหรับ Shopee affiliate — ยังไม่ใช้งาน) */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0}
@media(max-width:700px){.product-grid{grid-template-columns:repeat(2,1fr)}}
.product-card{background:var(--paper);border:1px solid var(--line);border-radius:16px;overflow:hidden;display:flex;flex-direction:column;transition:transform .15s}
.product-card:hover{transform:translateY(-2px)}
.product-card .p-img{aspect-ratio:1/1;background:var(--fog);display:flex;align-items:center;justify-content:center;overflow:hidden}
.product-card .p-img img{width:100%;height:100%;object-fit:cover}
.product-card .p-body{padding:14px 16px;display:flex;flex-direction:column;flex:1}
.product-card .p-name{font-size:14.5px;font-weight:500;flex:1}
.product-card .p-price{color:var(--yellow-dark);font-weight:700;margin:8px 0}
.product-card .btn{padding:9px 14px;min-height:40px;font-size:14px}
.affiliate-note{font-size:12.5px;color:var(--muted);margin-top:8px}
@media(max-width:768px){.contact-widget{bottom:84px}}

/* Blog article layout with sidebar */
.blog-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:40px;align-items:start}
.blog-layout .article{margin:0}
.blog-side{position:sticky;top:96px;display:grid;gap:20px}
.blog-side .card{padding:24px}
.blog-side h2{font-size:18px;margin-bottom:12px}
.blog-side ul{list-style:none;margin:0}
.blog-side li{border-bottom:1px solid var(--line)}
.blog-side li:last-child{border-bottom:0}
.blog-side li a{display:block;padding:10px 0;font-size:14.5px;font-weight:500;color:var(--ink)}
.blog-side li a:hover{color:var(--yellow-dark)}
.side-contact{background:var(--ink);color:var(--paper);border-radius:var(--r-card);padding:24px}
.side-contact h2{color:var(--paper)}
.side-contact p{font-size:14px;color:#B9BEC5;margin-bottom:14px}
.side-contact .btn{width:100%;margin-bottom:10px}
.side-contact .btn-outline{border-color:rgba(255,255,255,.9);color:#fff}
.side-contact .btn-outline:hover{background:#fff;color:var(--ink)}
@media(max-width:960px){.blog-layout{grid-template-columns:1fr}.blog-side{position:static}}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}
@media print{.topbar,.site-header,.mobile-cta,.site-footer,.article-cta{display:none}}