*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#c0392b;--primary-dark:#a93226;--primary-light:#fdecea;
  --secondary:#1a1a1a;--text:#222;--text-muted:#666;
  --bg:#ffffff;--bg-alt:#f8f9fa;--border:#e8e8e8;
  --radius:10px;--radius-sm:6px;
  --shadow:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);
  --shadow-md:0 4px 12px rgba(0,0,0,.08);
  --shadow-lg:0 12px 32px rgba(0,0,0,.12);
  --container:1180px;
  --font:'Noto Sans Thai','Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);font-size:16px;line-height:1.75;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
h1,h2,h3,h4{line-height:1.3;font-weight:700;color:var(--secondary)}
h1{font-size:clamp(1.6rem,4vw,2.5rem);margin-bottom:1rem}
h2{font-size:clamp(1.3rem,3vw,1.8rem);margin:2rem 0 1rem;padding-bottom:.5rem;border-bottom:2px solid var(--primary-light)}
h3{font-size:clamp(1.05rem,2.2vw,1.25rem);margin:1.5rem 0 .75rem;color:var(--primary)}
p{margin-bottom:1rem}
ul,ol{margin:1rem 0 1rem 1.5rem}
li{margin-bottom:.5rem}
.container{max-width:var(--container);margin:0 auto;padding:0 20px;width:100%}

.site-header{background:rgba(255,255,255,.95);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;backdrop-filter:saturate(180%) blur(10px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 20px;min-height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;color:var(--secondary);white-space:nowrap}
.logo-mark{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:8px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;font-weight:800;font-size:1.1rem;flex-shrink:0}
.main-nav{display:flex;gap:24px;align-items:center}
.main-nav a{color:var(--text);font-weight:500;font-size:.95rem;position:relative}
.main-nav a:hover{color:var(--primary)}
.main-nav a::after{content:'';position:absolute;bottom:-6px;left:0;width:0;height:2px;background:var(--primary);transition:width .25s}
.main-nav a:hover::after{width:100%}
.header-actions{display:flex;align-items:center;gap:10px}
.menu-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px;width:40px;height:40px;justify-content:center;align-items:center}
.menu-toggle span{display:block;width:22px;height:2px;background:var(--secondary);border-radius:2px;transition:all .25s}
.menu-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.menu-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.cta-buttons{display:flex;gap:10px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 22px;border-radius:var(--radius-sm);font-weight:600;font-size:.95rem;line-height:1;text-decoration:none;cursor:pointer;border:2px solid transparent;transition:all .2s ease;white-space:nowrap;font-family:inherit}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 2px 8px rgba(192,57,43,.25)}
.btn-primary:hover{background:var(--primary-dark);color:#fff;transform:translateY(-1px);box-shadow:0 4px 14px rgba(192,57,43,.35)}
.btn-secondary{background:var(--secondary);color:#fff}
.btn-secondary:hover{background:#000;color:#fff;transform:translateY(-1px)}
.btn-outline{background:transparent;color:var(--primary);border-color:var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}

.hero{background:linear-gradient(135deg,#fff 0%,var(--primary-light) 100%);padding:64px 0;text-align:center;border-bottom:1px solid var(--border)}
.hero h1{font-size:clamp(1.8rem,5vw,3rem);color:var(--primary);margin-bottom:1rem;font-weight:800}
.hero-sub{font-size:clamp(1rem,2.5vw,1.2rem);color:var(--text-muted);max-width:640px;margin:0 auto 2rem}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

.brand-section{padding:56px 0}
.section-title{text-align:center;border:none;margin-bottom:.5rem;color:var(--secondary)}
.section-sub{text-align:center;color:var(--text-muted);margin-bottom:2.5rem}
.brand-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.brand-card{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:16px 20px;background:#fff;border:1px solid var(--border);border-radius:var(--radius);color:var(--secondary);font-weight:600;transition:all .25s ease;box-shadow:var(--shadow)}
.brand-card:hover{transform:translateY(-3px);border-color:var(--primary);box-shadow:var(--shadow-md);color:var(--primary)}
.brand-card-arrow{color:var(--primary);font-size:1.1rem;transition:transform .25s}
.brand-card:hover .brand-card-arrow{transform:translateX(4px)}

.breadcrumb{background:var(--bg-alt);padding:12px 0;border-bottom:1px solid var(--border);font-size:.88rem}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0}
.breadcrumb li{display:flex;align-items:center;gap:8px;margin:0;color:var(--text-muted)}
.breadcrumb li:not(:last-child)::after{content:'›';color:var(--text-muted);margin-left:4px}
.breadcrumb a{color:var(--primary);font-weight:500}

.brand-article{background:#fff;padding:32px 0 24px;max-width:820px;margin:0 auto}
.article-header{margin-bottom:2rem}
.article-header h1{margin-bottom:.75rem}
.article-meta{display:flex;flex-wrap:wrap;gap:16px;color:var(--text-muted);font-size:.88rem;padding-bottom:1rem;border-bottom:1px solid var(--border);margin-bottom:1.5rem}
.article-meta span{display:inline-flex;align-items:center;gap:4px}
.article-cta{margin:1.5rem 0}
.article-body{font-size:1.05rem;color:#333}
.article-body p{text-align:justify}
.article-body h2{margin-top:2rem}
.article-body h3{color:var(--secondary);font-weight:600}
.article-body ul{background:var(--bg-alt);padding:16px 16px 16px 40px;border-radius:var(--radius-sm);border-left:4px solid var(--primary)}
.article-body ul li{margin-bottom:.5rem}
.faq-q{background:var(--bg-alt);padding:14px 18px;border-radius:var(--radius-sm) var(--radius-sm) 0 0;margin:1rem 0 0;border-left:4px solid var(--primary);color:var(--secondary)}
.faq-a{background:#fff;padding:14px 18px;border:1px solid var(--border);border-top:none;border-radius:0 0 var(--radius-sm) var(--radius-sm);margin:0 0 1rem;color:var(--text-muted)}

.related-brands{margin-top:48px;padding-top:32px;border-top:2px solid var(--border);max-width:820px;margin-left:auto;margin-right:auto}
.related-brands h2{text-align:center;border:none}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
.related-card{display:block;padding:14px 16px;background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--secondary);font-weight:500;font-size:.92rem;text-align:center;transition:all .2s}
.related-card:hover{background:var(--primary);color:#fff;border-color:var(--primary);transform:translateY(-2px)}

.site-footer{background:var(--secondary);color:#ccc;padding:48px 0 0;margin-top:64px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:32px;padding-bottom:32px}
.footer-col h3{color:#fff;font-size:1.05rem;margin-bottom:1rem}
.footer-col p{color:#aaa;font-size:.9rem}
.footer-col ul{list-style:none;margin:0;padding:0}
.footer-col li{margin-bottom:.5rem}
.footer-col a{color:#bbb;font-size:.9rem}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid #333;padding:20px 0;text-align:center;color:#888;font-size:.85rem}

#back-to-top{position:fixed;bottom:24px;right:24px;width:44px;height:44px;border-radius:50%;background:var(--primary);color:#fff;border:none;cursor:pointer;font-size:1.2rem;font-weight:700;box-shadow:var(--shadow-md);opacity:0;visibility:hidden;transform:translateY(10px);transition:all .3s;z-index:99}
#back-to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
#back-to-top:hover{background:var(--primary-dark);transform:translateY(-3px)}

@media (max-width:900px){
  .main-nav{gap:16px}
  .main-nav a{font-size:.9rem}
}
@media (max-width:768px){
  .header-inner{padding:12px 16px;min-height:60px}
  .logo-text{font-size:1rem}
  .main-nav{position:fixed;top:60px;left:0;right:0;background:#fff;flex-direction:column;padding:20px;gap:16px;border-bottom:1px solid var(--border);box-shadow:var(--shadow-md);transform:translateY(-110%);transition:transform .3s;align-items:flex-start}
  .main-nav.open{transform:translateY(0)}
  .main-nav a{font-size:1rem;padding:8px 0;width:100%}
  .main-nav a::after{display:none}
  .menu-toggle{display:flex}
  .hero{padding:40px 0}
  .brand-section{padding:40px 0}
  .brand-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
  .brand-card{padding:14px 16px;font-size:.92rem}
  .brand-article{padding:24px 0 16px}
  .article-body{font-size:1rem}
  .article-body p{text-align:left}
  .related-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
  .cta-buttons{width:100%}
  .btn{flex:1;min-width:0}
}
@media (max-width:480px){
  .container{padding:0 16px}
  h1{font-size:1.5rem}
  h2{font-size:1.25rem}
  h3{font-size:1.05rem}
  .hero{padding:32px 0}
  .hero h1{font-size:1.6rem}
  .hero-sub{font-size:.95rem}
  .brand-grid{grid-template-columns:1fr 1fr;gap:8px}
  .brand-card{padding:12px;font-size:.88rem;flex-direction:column;align-items:flex-start;gap:4px}
  .brand-card-arrow{display:none}
  .article-meta{font-size:.82rem;gap:10px}
  .btn{padding:10px 16px;font-size:.9rem}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  #back-to-top{bottom:16px;right:16px;width:40px;height:40px}
}

:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}
}
@media print{
  .site-header,.site-footer,.cta-buttons,.related-brands,#back-to-top{display:none}
}