:root{
  --bg:#0a0b0c; --panel:#17181c; --panel-2:#1d1f24; --border:#2a2c31;
  --red:#e10600; --red-dim:#a80400; --white:#f3f4f6; --silver:#d7dae0;
  --muted:#9aa0a8; --radius:14px; --maxw:1180px;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{background:var(--bg);color:var(--white);font-family:'Rajdhani','Noto Sans Thai',sans-serif;font-size:16px;line-height:1.6;}
h1,h2,h3,h4{font-family:'Orbitron','Noto Sans Thai',sans-serif;margin:0 0 .5em 0;letter-spacing:.5px;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px;}
.muted{color:var(--muted);}
.red-tag{display:inline-block;color:var(--red);font-weight:700;letter-spacing:2px;font-size:.85rem;text-transform:uppercase;margin-bottom:10px;}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:8px;font-weight:700;font-family:'Orbitron',sans-serif;font-size:.85rem;letter-spacing:1px;cursor:pointer;border:2px solid transparent;transition:all .15s ease;text-transform:uppercase;}
.btn-primary{background:var(--red);color:#fff;}
.btn-primary:hover{background:var(--red-dim);}
.btn-outline{background:transparent;color:var(--white);border-color:var(--border);}
.btn-outline:hover{border-color:var(--silver);}
.btn:disabled{opacity:.5;cursor:not-allowed;}
header.site-header{position:sticky;top:0;z-index:50;background:rgba(10,11,12,.92);backdrop-filter:blur(6px);border-bottom:1px solid var(--border);}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;max-width:var(--maxw);margin:0 auto;}
.logo-img{height:34px;width:auto;}
nav.main-nav{display:flex;gap:26px;align-items:center;}
nav.main-nav a{font-family:'Orbitron',sans-serif;font-size:.78rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--silver);}
nav.main-nav a:hover{color:var(--red);}
.cart-link{position:relative;display:flex;align-items:center;}
.cart-badge{position:absolute;top:-8px;right:-14px;background:var(--red);color:#fff;font-size:.7rem;font-weight:700;border-radius:50%;width:18px;height:18px;display:flex;align-items:center;justify-content:center;}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:1.4rem;cursor:pointer;}
.hero{padding:60px 0 40px;border-bottom:1px solid var(--border);}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;}
.hero h1{font-size:2.4rem;line-height:1.25;color:#fff;}
.hero p.lead{color:var(--muted);font-size:1.05rem;max-width:520px;}
.hero-actions{display:flex;gap:14px;margin:22px 0 30px;}
.hero-stats{display:flex;gap:30px;}
.hero-stats div{padding-right:30px;border-right:1px solid var(--border);}
.hero-stats div:last-child{border-right:none;}
.hero-stats b{display:block;font-family:'Orbitron',sans-serif;font-size:1.3rem;color:#fff;}
.hero-media{background:linear-gradient(180deg,#e9eaee,#cfd2d8);border-radius:var(--radius);padding:26px;border:1px solid var(--border);}
.hero-media img{mix-blend-mode:multiply;}
.section{padding:60px 0;}
.section-head{margin-bottom:34px;max-width:640px;}
.product-list{display:flex;flex-direction:column;gap:26px;}
.product-card{display:flex;flex-direction:row;align-items:stretch;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;}
.product-media{flex:0 0 38%;max-width:38%;background:linear-gradient(180deg,#e9eaee,#cfd2d8);display:flex;align-items:center;justify-content:center;padding:22px;}
.product-media img{width:100%;height:100%;object-fit:contain;max-height:260px;mix-blend-mode:multiply;}
.product-info{flex:1 1 62%;padding:24px 26px;display:flex;flex-direction:column;justify-content:center;}
.product-info h3{font-size:1.3rem;color:#fff;margin-bottom:6px;}
.product-info .desc{color:var(--muted);font-size:.92rem;margin-bottom:12px;}
.product-specs{list-style:none;padding:0;margin:0 0 14px 0;}
.product-specs li{position:relative;padding-left:18px;margin-bottom:6px;font-size:.86rem;color:var(--silver);}
.product-specs li::before{content:"";position:absolute;left:0;top:8px;width:6px;height:6px;border-radius:50%;background:var(--red);}
.price-row{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;margin:8px 0 4px;padding-top:12px;border-top:1px solid var(--border);}
.price{font-family:'Orbitron',sans-serif;font-size:1.4rem;color:var(--silver);font-weight:700;}
.price-note{font-size:.76rem;color:var(--muted);}
.buy-row{display:flex;align-items:center;gap:14px;margin-top:14px;flex-wrap:wrap;}
.qty-selector{display:flex;align-items:center;border:1px solid var(--border);border-radius:8px;overflow:hidden;}
.qty-selector button{background:var(--panel-2);color:#fff;border:none;width:34px;height:38px;cursor:pointer;font-size:1rem;}
.qty-selector input{width:44px;text-align:center;background:var(--panel);color:#fff;border:none;border-left:1px solid var(--border);border-right:1px solid var(--border);height:38px;font-size:.95rem;}
@media (max-width:720px){
  .hero-grid{grid-template-columns:1fr;}
  nav.main-nav{display:none;}
  .nav-toggle{display:block;}
  .product-media{flex-basis:34%;max-width:34%;padding:10px;}
  .product-media img{max-height:140px;}
  .product-info{padding:14px 14px;}
  .product-info h3{font-size:1rem;}
  .product-info .desc{font-size:.74rem;margin-bottom:8px;}
  .product-specs li{font-size:.7rem;padding-left:14px;margin-bottom:4px;}
  .product-specs li::before{width:5px;height:5px;top:6px;}
  .price{font-size:1rem;}
  .price-note{font-size:.62rem;}
  .buy-row{gap:8px;margin-top:8px;}
  .qty-selector button{width:26px;height:28px;font-size:.8rem;}
  .qty-selector input{width:30px;height:28px;font-size:.75rem;}
  .btn{padding:8px 12px;font-size:.65rem;}
  .price-row{padding-top:8px;margin:6px 0 2px;}
}
.reasons-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.reason-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:22px;}
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.review-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:22px;}
.review-stars{color:var(--red);margin-bottom:8px;}
@media (max-width:900px){.reasons-grid,.reviews-grid{grid-template-columns:1fr;}}
footer.site-footer{border-top:1px solid var(--border);padding:34px 0;margin-top:40px;color:var(--muted);font-size:.85rem;text-align:center;}
.cart-table{width:100%;border-collapse:collapse;}
.cart-table th{text-align:left;color:var(--muted);font-size:.8rem;text-transform:uppercase;letter-spacing:1px;padding-bottom:12px;border-bottom:1px solid var(--border);}
.cart-table td{padding:16px 0;border-bottom:1px solid var(--border);vertical-align:middle;}
.cart-item-info{display:flex;align-items:center;gap:14px;}
.cart-item-info img{width:70px;height:70px;object-fit:contain;background:#e9eaee;border-radius:8px;padding:6px;mix-blend-mode:multiply;}
.cart-summary{max-width:360px;margin-left:auto;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:22px;margin-top:26px;}
.cart-summary .row{display:flex;justify-content:space-between;margin-bottom:10px;}
.cart-summary .total{font-family:'Orbitron',sans-serif;font-size:1.2rem;color:#fff;border-top:1px solid var(--border);padding-top:10px;margin-top:10px;}
.remove-btn{background:none;border:none;color:var(--muted);cursor:pointer;font-size:.8rem;text-decoration:underline;}
.empty-msg{text-align:center;padding:60px 0;color:var(--muted);}
.order-form{max-width:520px;margin:0 auto;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:28px;}
.order-form label{display:block;font-size:.82rem;color:var(--muted);margin-bottom:6px;margin-top:16px;}
.order-form input,.order-form textarea{width:100%;padding:10px 12px;background:var(--panel-2);border:1px solid var(--border);border-radius:8px;color:#fff;font-family:inherit;font-size:.95rem;}
.order-form textarea{resize:vertical;min-height:70px;}
#order-result{max-width:560px;margin:30px auto 0;}
.summary-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:26px;}
.summary-card h3{color:#fff;}
.summary-line{display:flex;justify-content:space-between;font-size:.9rem;padding:6px 0;border-bottom:1px dashed var(--border);}
.qr-box{background:#fff;padding:14px;border-radius:10px;display:flex;align-items:center;justify-content:center;margin:18px 0;}
.qr-box img{width:200px;height:200px;}
.result-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px;}
.hidden{display:none !important;}
.steps{display:flex;flex-direction:column;gap:18px;}
.step{display:flex;gap:18px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:20px;}
.step-num{font-family:'Orbitron',sans-serif;color:var(--red);font-size:1.4rem;font-weight:700;flex:0 0 40px;}
/* ---------- Print Mode Fix ---------- */
@media print{
  header.site-header{
    position: static !important;
  }
}
/* ---------- Review Photos ---------- */
.review-photos{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.review-photo{margin:0;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;}
.review-photo img{width:100%;aspect-ratio:4/3;object-fit:cover;}
@media (max-width:720px){
  .review-photos{grid-template-columns:repeat(2,1fr);gap:12px;}
}
/* ---------- Product Categories ---------- */
html{scroll-behavior:smooth;}
.product-list{gap:44px;}
.category-nav{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:30px;}
.cat-btn{padding:10px 20px;border:1px solid var(--border);border-radius:999px;font-family:'Orbitron',sans-serif;font-size:.78rem;letter-spacing:1px;color:var(--silver);background:var(--panel);transition:all .15s ease;}
.cat-btn:hover{border-color:var(--red);color:#fff;}
.category-block{scroll-margin-top:90px;}
.category-title{font-size:1.15rem;color:#fff;margin-bottom:18px;padding-left:12px;border-left:4px solid var(--red);}
.category-items{display:flex;flex-direction:column;gap:26px;}

/* ---------- Sticky Category Bar ---------- */
.category-nav{
  position:sticky;
  top:64px;                 /* ความสูงของแถบเมนูด้านบน */
  z-index:40;               /* ต่ำกว่าเมนูหลัก (50) */
  flex-wrap:nowrap;
  overflow-x:auto;          /* ถ้าปุ่มเยอะ ปัดซ้าย-ขวาได้ */
  padding:12px 0;
  margin-bottom:24px;
  background:rgba(10,11,12,.95);
  backdrop-filter:blur(6px);
  border-bottom:1px solid var(--border);
}
.cat-btn{flex:0 0 auto;white-space:nowrap;}
.category-block{scroll-margin-top:150px;}