/* ==========================================
    Tri-Pole – Industrial B2B Website
    ========================================== */
 
 /* --- Variables --- */
 :root {
   --primary:    #1B3A5C;
   --primary-lt: #2A5280;
   --primary-dk: #0F2640;
   --accent:     #E8A838;
   --accent-lt:  #F0C060;
   --gray-100:   #F5F7FA;
   --gray-200:   #E4E8EE;
   --gray-300:   #C5CDD9;
   --gray-500:   #6B7B8D;
   --gray-700:   #3D4A5C;
   --gray-900:   #1A2332;
   --white:      #FFFFFF;
   --body:       #3D4A5C;
   --radius:     8px;
   --shadow-sm:  0 1px 3px rgba(0,0,0,.08);
   --shadow-md:  0 4px 12px rgba(0,0,0,.1);
   --shadow-lg:  0 8px 30px rgba(0,0,0,.12);
   --container:  1420px;
   --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
   --font-zh:    'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
 }
 
 /* --- Reset --- */
 *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
 html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
 body {
   font-family: var(--font-sans);
   font-size: 16px;
   line-height: 1.7;
   color: var(--body);
   background: var(--white);
   -webkit-font-smoothing: antialiased;
 }
 body.lang-zh { font-family: var(--font-zh); }
 img { max-width: 100%; height: auto; display: block; }
 a { color: var(--primary); text-decoration: none; transition: color .2s; }
 a:hover { color: var(--accent); }
 ul { list-style: none; }
 .container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }
 
 /* --- Typography --- */
 h1, h2, h3, h4 { color: var(--primary-dk); line-height: 1.3; font-weight: 700; }
 h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); margin-bottom: 16px; }
 h2 { font-size: clamp(1.4rem, 3vw, 2.0rem); margin-bottom: 12px; }
 h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); margin-bottom: 8px; }
 .section-title { text-align: center; margin-bottom: 40px; }
 .section-title h2 { position: relative; display: inline-block; }
 .section-title h2::after {
   content: ''; display: block; width: 60px; height: 3px;
   background: var(--accent); margin: 12px auto 0; border-radius: 2px;
 }
 
 /* --- Buttons --- */
 .btn {
   display: inline-flex; align-items: center; gap: 8px;
   padding: 12px 28px; border: none; border-radius: var(--radius);
   font-size: 15px; font-weight: 600; cursor: pointer;
   transition: all .25s; text-decoration: none; white-space: nowrap;
 }
 .btn-primary { background: var(--primary); color: var(--white); }
 .btn-primary:hover { background: var(--primary-lt); color: var(--white); transform: translateY(-1px); }
 .btn-accent { background: var(--accent); color: var(--primary-dk); }
 .btn-accent:hover { background: var(--accent-lt); transform: translateY(-1px); }
 .btn-outline {
   background: transparent; border: 2px solid var(--primary); color: var(--primary);
 }
 .btn-outline:hover { background: var(--primary); color: var(--white); }
 
 /* --- Header / Nav --- */
 .site-header {
   position: sticky; top: 0; z-index: 100;
   background: rgba(255,255,255,.94); border-bottom: 1px solid rgba(31,41,51,.14);
   box-shadow: none; backdrop-filter: blur(10px);
 }
 .header-inner {
   display: flex; align-items: center; justify-content: space-between;
   min-height: 68px; height: auto; width: min(100% - 32px, var(--container)); max-width: none; margin: 0 auto; padding: 0;
 }
 .logo { display: flex; align-items: center; gap: 10px; }
 .logo img { width: 34px; height: 34px; flex: 0 0 auto; }
 .logo-text {
   font-size: 16px; font-weight: 700; color: var(--gray-900);
   letter-spacing: 0;
 }
 .main-nav { display: flex; align-items: center; gap: 22px; }
 .main-nav a {
   font-size: 14px; font-weight: 500; color: var(--gray-500);
   padding: 4px 0; position: relative;
 }
 .main-nav a::after {
   content: ''; position: absolute; bottom: -2px; left: 0;
   width: 0; height: 2px; background: var(--accent);
   transition: width .25s;
 }
 .main-nav a:hover::after,
 .main-nav a.active::after { width: 100%; }
 .main-nav a.active { color: var(--primary); font-weight: 600; }
 .nav-dropdown { position: relative; display: flex; align-items: center; }
 .products-dropdown {
   position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
   min-width: 220px; padding: 8px 0; background: var(--white);
   border: 1px solid var(--gray-200); box-shadow: var(--shadow-md);
   opacity: 0; visibility: hidden;
   pointer-events: none; transition: opacity .18s, visibility .18s;
   z-index: 120;
 }
 .nav-dropdown:hover .products-dropdown,
 .nav-dropdown:focus-within .products-dropdown {
   opacity: 1; visibility: visible; pointer-events: auto;
 }
 .products-dropdown a {
   display: block; padding: 11px 20px; color: var(--gray-700);
   font-size: 14px; font-weight: 500; text-align: left; white-space: nowrap;
   border-left: 3px solid transparent;
 }
 .products-dropdown a::after { display: none; }
 .products-dropdown a:hover {
   background: var(--gray-100); color: var(--primary);
   border-left-color: var(--accent);
 }
 
 /* Language Switcher */
 /* Mobile Menu Toggle */
 .menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
 .menu-toggle span {
   display: block; width: 24px; height: 2px; background: var(--gray-700);
   margin: 5px 0; transition: .3s; border-radius: 1px;
 }
 
 /* --- Hero --- */
 .hero {
   position: relative; min-height: min(680px, calc(100vh - 68px));
   display: flex; align-items: center; overflow: hidden;
 }
 .hero-bg {
   position: absolute; inset: 0; z-index: 0;
 }
 .hero-bg img {
   width: 100%; height: 100%; object-fit: cover; object-position: center center;
 }
 .hero-overlay {
   position: absolute; inset: 0;
   background: linear-gradient(90deg, rgba(10,28,43,.88), rgba(10,28,43,.58) 42%, rgba(10,28,43,.1));
   z-index: 1;
 }
 .hero-content {
   position: relative; z-index: 2;
   width: min(100% - 32px, var(--container)); max-width: none; padding: 64px 0; margin: 0 auto;
 }
 .hero-content h1 {
   color: var(--white); font-size: clamp(38px, 6vw, 68px);
   line-height: 1.14; margin-bottom: 18px; max-width: 760px;
 }
 .hero-content p {
   color: rgba(255,255,255,.88); font-size: 18px;
   line-height: 1.55; margin-bottom: 0; max-width: 680px;
 }
 .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
 .hero .btn {
   min-height: 44px; padding: 10px 16px; border-radius: 0;
   font-size: 15px; font-weight: 700;
 }
 .hero .btn-accent {
   background: var(--accent); color: var(--primary-dk);
 }
 .hero .btn-accent:hover {
   background: var(--accent-lt); color: var(--primary-dk);
 }
 .hero .btn-outline {
   background: rgba(255,255,255,.1); color: var(--white);
   border-width: 1px;
 }
 
 /* --- Brands Section (Home) --- */
 .brands-grid {
   display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
   gap: 24px; margin: 0 auto;
 }
 .brand-card {
   display: flex; flex-direction: column; align-items: center; justify-content: center;
   padding: 32px 20px; background: var(--gray-100);
   border-radius: var(--radius); border: 1px solid var(--gray-200);
   transition: all .3s; text-align: center; min-height: 120px;
 }
 .brand-card:hover {
   border-color: var(--accent); box-shadow: var(--shadow-md); transform: translateY(-2px);
 }
 .brand-card h3 { font-size: 16px; margin-bottom: 4px; }
 .brand-card span { font-size: 13px; color: var(--gray-500); }
 
 /* --- Features / Advantages --- */
 .features-grid {
   display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
   gap: 24px;
 }
 .feature-card {
   padding: 32px 24px; background: var(--gray-100);
   border-radius: var(--radius); border: 1px solid var(--gray-200);
   color: inherit; text-decoration: none; transition: all .3s;
 }
 .feature-card:hover { border-color: var(--accent); box-shadow: var(--shadow-md); }
 .feature-card:focus-visible { outline: 3px solid rgba(232,168,56,.4); outline-offset: 3px; }
 .feature-icon { width: 48px; height: 48px; margin-bottom: 16px; }
 .feature-card h3 { font-size: 17px; margin-bottom: 8px; }
 .feature-card p { font-size: 14px; color: var(--gray-500); line-height: 1.6; }
 
 /* --- Product Cards --- */
 .products-controls {
   display: flex; flex-wrap: wrap; gap: 12px; align-items: center;
   margin-bottom: 28px;
 }
 .products-controls .search-box {
   flex: 1; min-width: 200px; position: relative;
 }
 .products-controls .search-box input {
   width: 100%; padding: 10px 16px 10px 40px;
   border: 1px solid var(--gray-300); border-radius: var(--radius);
   font-size: 14px; outline: none; transition: border-color .2s;
 }
 .products-controls .search-box input:focus { border-color: var(--primary); }
 .products-controls .search-box .search-icon {
   position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
   width: 18px; height: 18px; opacity: .5;
 }
 .filter-tabs {
   display: flex; flex-wrap: wrap; gap: 8px;
 }
 .filter-tab {
   padding: 8px 18px; border: 1px solid var(--gray-300);
   border-radius: 20px; background: var(--white); cursor: pointer;
   font-size: 13px; font-weight: 500; color: var(--gray-700);
   transition: all .2s; white-space: nowrap;
 }
 .filter-tab:hover { border-color: var(--primary); color: var(--primary); }
 .filter-tab.active { background: var(--primary); color: var(--white); border-color: var(--primary); }
 
 .products-grid {
   display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
   gap: 20px;
 }
 .product-card {
   border: 1px solid var(--gray-200); border-radius: var(--radius);
   overflow: hidden; transition: all .3s; background: var(--white);
   display: flex; flex-direction: column;
 }
 .product-card:hover { border-color: var(--accent); box-shadow: var(--shadow-md); }
.product-card-img {
  width: 100%; height: 200px; overflow: hidden;
  background: var(--gray-100); display: flex; align-items: center; justify-content: center;
}
.product-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.product-card-img-link {
  display: block; width: 100%; height: 100%;
}
.product-card-img-link img { transition: transform .25s; }
.product-card-img-link:hover img { transform: scale(1.03); }
.product-card-img .placeholder {
  color: var(--gray-300); font-size: 13px;
}
 .product-card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
 .product-card-body .brand-tag {
   display: inline-block; font-size: 11px; font-weight: 600;
   color: var(--accent); text-transform: uppercase; letter-spacing: .5px;
   margin-bottom: 4px;
 }
 .product-card-body .model { font-size: 12px; color: var(--gray-500); margin-bottom: 8px; }
 .product-card-body h3 { font-size: 15px; margin-bottom: 6px; }
 .product-card-body p { font-size: 13px; color: var(--gray-500); line-height: 1.5; margin-bottom: 12px; flex: 1; }
 .product-card-body .features {
   display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 14px;
 }
 .product-card-body .features span {
   font-size: 11px; background: var(--gray-100); padding: 3px 8px;
   border-radius: 4px; color: var(--gray-700);
 }
.product-card-body .product-actions { display: flex; gap: 8px; margin-top: auto; }
.product-card-body .product-actions .btn { font-size: 13px; padding: 8px 18px; }
.product-card-body .product-actions .btn-accent { background: var(--accent); color: var(--primary-dk); }
.product-card-body .product-actions .btn-accent:hover { background: var(--accent-lt); color: var(--primary-dk); }
 
 /* Pagination */
 .pagination {
   display: flex; justify-content: center; gap: 6px; margin-top: 36px;
 }
 .pagination button {
   padding: 8px 14px; border: 1px solid var(--gray-300);
   border-radius: 4px; background: var(--white); cursor: pointer;
   font-size: 14px; transition: all .2s;
 }
 .pagination button:hover { border-color: var(--primary); color: var(--primary); }
 .pagination button.active { background: var(--primary); color: var(--white); border-color: var(--primary); }
 .pagination button:disabled { opacity: .4; cursor: default; }
 
 /* --- About Page --- */
 .about-hero {
   padding: 60px 0; background: var(--gray-100); border-bottom: 1px solid var(--gray-200);
 }
 .about-grid {
   display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
 }
 .about-bullets { margin-top: 20px; }
 .about-bullets li {
   padding: 12px 0; border-bottom: 1px solid var(--gray-200);
   font-size: 15px; line-height: 1.5;
 }
 .about-bullets li:last-child { border-bottom: none; }
 .about-bullets li strong { color: var(--primary); display: block; margin-bottom: 2px; }
 
 /* --- Contact Page --- */
 .contact-grid {
   display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
 }
 .contact-form { display: flex; flex-direction: column; gap: 16px; }
 .contact-form .form-row { display: flex; flex-direction: column; gap: 6px; }
 .contact-form label { font-size: 14px; font-weight: 600; color: var(--gray-700); }
 .contact-form input,
 .contact-form select,
 .contact-form textarea {
   padding: 12px 14px; border: 1px solid var(--gray-300);
   border-radius: var(--radius); font-size: 14px; font-family: inherit;
   outline: none; transition: border-color .2s;
 }
 .contact-form input:focus,
 .contact-form select:focus,
 .contact-form textarea:focus { border-color: var(--primary); }
.contact-form textarea { min-height: 120px; resize: vertical; }
.contact-form .submit-btn { align-self: flex-start; }
.form-status { min-height: 22px; font-size: 14px; font-weight: 600; }
.form-status.success { color: #0f766e; }
.form-status.error { color: #b91c1c; }
.turnstile-field[hidden] { display: none; }
 .product-picker {
   border: 1px solid var(--gray-300); border-radius: var(--radius);
   background: var(--white); position: relative; overflow: visible;
 }
 .selected-products {
   min-height: 48px; display: flex; flex-wrap: wrap; align-items: center;
   gap: 8px; padding: 10px 38px 10px 12px; cursor: text;
 }
 .product-picker-placeholder { color: var(--gray-500); font-size: 14px; }
 .product-picker-input {
   flex: 1 1 220px; min-width: 160px; border: none; outline: none;
   padding: 7px 4px; color: var(--gray-900); font: inherit; background: transparent;
 }
 .product-picker-input::placeholder { color: var(--gray-500); }
 .product-picker-toggle {
   position: absolute; right: 10px; bottom: 10px; width: 18px; height: 18px;
   border: none; background: transparent; cursor: pointer; padding: 0;
 }
 .product-picker-toggle::before {
   content: ""; display: block; width: 0; height: 0; margin: 5px auto 0;
   border-left: 5px solid transparent; border-right: 5px solid transparent;
   border-top: 6px solid var(--gray-500);
 }
 .product-picker.open .product-picker-toggle::before {
   border-top: none; border-bottom: 6px solid var(--gray-500);
 }
 .selected-product-chip {
   display: inline-flex; align-items: center; gap: 8px;
   max-width: 100%; padding: 7px 8px 7px 12px;
   background: var(--gray-100); border: 1px solid var(--gray-200);
   border-radius: 4px; color: var(--gray-900); font-size: 14px;
 }
 .selected-product-chip button {
   width: 22px; height: 22px; border: none; border-radius: 50%;
   background: var(--gray-900); color: var(--white); cursor: pointer;
   line-height: 20px; font-size: 18px; padding: 0;
 }
 .product-picker-menu {
   display: none; position: absolute; z-index: 30; top: 100%; left: -1px; right: -1px;
   grid-template-columns: 180px 1fr; min-height: 220px;
   border: 1px solid var(--gray-300); border-top: 1px solid var(--gray-200);
   border-radius: 0 0 var(--radius) var(--radius); background: var(--white);
   box-shadow: 0 14px 28px rgba(15, 23, 42, .14);
 }
 .product-picker.open .product-picker-menu,
 .product-picker:hover .product-picker-menu { display: grid; }
 .product-picker-categories {
   border-right: 1px solid var(--gray-200); background: var(--gray-100);
 }
 .product-picker-categories button,
 .product-picker-products button {
   width: 100%; border: none; background: transparent; cursor: pointer;
   font-family: inherit; text-align: left;
 }
 .product-picker-categories button {
   padding: 12px 14px; color: var(--gray-700); font-size: 14px;
   border-left: 3px solid transparent;
 }
 .product-picker-categories button:hover,
 .product-picker-categories button.active {
   background: var(--white); color: var(--primary); border-left-color: var(--accent);
 }
 .product-picker-products {
   max-height: 260px; overflow: auto; padding: 8px;
 }
 .product-picker-products button {
   padding: 9px 10px; color: var(--gray-700); font-size: 14px; border-radius: 4px;
 }
 .product-picker-products button:hover {
   background: var(--gray-100); color: var(--primary);
 }
 .product-picker-empty { padding: 14px 10px; color: var(--gray-500); font-size: 14px; }
 .contact-info h3 { margin-bottom: 16px; }
 .contact-info-item {
   display: flex; align-items: center; gap: 14px;
   padding: 16px 0; border-bottom: 1px solid var(--gray-200);
 }
 .contact-info-item:last-child { border-bottom: none; }
.contact-info-item .icon { width: 24px; height: 24px; flex-shrink: 0; }
.contact-info-item .label { font-size: 12px; color: var(--gray-500); }
.contact-info-item .value { font-size: 15px; font-weight: 500; color: var(--gray-900); }
.wechat-qr {
  display: block; width: 104px; height: 104px; object-fit: contain;
  margin-top: 6px; border: 1px solid var(--gray-200); border-radius: 4px;
}

/* --- Footer --- */
 .site-footer {
   background: var(--primary-dk); color: rgba(255,255,255,.7); padding: 48px 0 32px;
   margin-top: 80px;
 }
 .footer-grid {
   display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px;
 }
 .footer-col h4 {
   color: var(--white); font-size: 15px; margin-bottom: 16px;
 }
 .footer-col a { display: block; color: rgba(255,255,255,.6); font-size: 14px; margin-bottom: 8px; }
 .footer-col a:hover { color: var(--accent); }
 .footer-brand p { font-size: 14px; margin-top: 8px; line-height: 1.6; }
 .footer-bottom {
   margin-top: 36px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.1);
   text-align: center; font-size: 13px;
 }
 
 /* --- Sections Spacing --- */
 .section { padding: 80px 0; }
 .section-gray { background: var(--gray-100); }
 .section-dark { background: var(--primary-dk); color: rgba(255,255,255,.8); }
 .section-dark h2 { color: var(--white); }
 
 /* --- Breadcrumb --- */
 .breadcrumb {
   padding: 16px 0; font-size: 13px; color: var(--gray-500);
   border-bottom: 1px solid var(--gray-200); margin-bottom: 40px;
 }
 .breadcrumb a { color: var(--gray-500); }
 .breadcrumb a:hover { color: var(--primary); }
 .breadcrumb span { color: var(--gray-700); }
 
 /* --- Page Header --- */
 .page-header {
   padding: 60px 0 40px; background: var(--gray-100);
   text-align: center; border-bottom: 1px solid var(--gray-200);
 }
 .page-header h1 { margin-bottom: 8px; }
 .page-header p { color: var(--gray-500); max-width: 600px; margin: 0 auto; }
 
 /* --- Utility --- */
 .text-accent { color: var(--accent); }
 .text-center { text-align: center; }
 .mt-20 { margin-top: 20px; }
 .mb-40 { margin-bottom: 40px; }
 
 /* ==========================================
    Responsive
    ========================================== */
 @media (max-width: 768px) {
   .menu-toggle { display: block; }
   .main-nav {
     display: none; flex-direction: column;
     position: absolute; top: 68px; left: 0; right: 0;
     background: var(--white); border-bottom: 1px solid var(--gray-200);
     box-shadow: var(--shadow-md); padding: 16px 20px; gap: 12px;
   }
   .main-nav.open { display: flex; }
   .main-nav a { font-size: 16px; padding: 8px 0; }
   .nav-dropdown { display: flex; flex-direction: column; align-items: stretch; width: 100%; }
   .products-dropdown {
     position: static; transform: none; opacity: 1; visibility: visible;
     pointer-events: auto; min-width: 0; width: 100%; margin-top: 4px;
     box-shadow: none;
   }
   .products-dropdown a { font-size: 14px; padding: 10px 16px; }
   .hero { min-height: 70vh; }
   .hero-content { padding: 40px 20px; margin-left: 0; }
   .hero-actions .btn { font-size: 14px; padding: 10px 20px; }
   .about-grid,
   .contact-grid { grid-template-columns: 1fr; gap: 32px; }
   .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
   .products-grid { grid-template-columns: 1fr; }
   .product-detail-layout { grid-template-columns: 1fr; gap: 24px; }
   .product-detail-summary h1 { font-size: 24px; }
   .product-detail-specs td { display: block; width: 100%; }
   .product-detail-specs td:first-child { width: 100%; border-bottom: none; }
   .brands-grid { grid-template-columns: repeat(2, 1fr); }
   .products-controls { flex-direction: column; }
   .products-controls .search-box { width: 100%; }
   .product-picker-menu { grid-template-columns: 1fr; }
   .product-picker-categories { border-right: none; border-bottom: 1px solid var(--gray-200); }
   .product-picker-products { max-height: 220px; }
 }
 @media (max-width: 480px) {
   .brands-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
   .features-grid { grid-template-columns: 1fr; }
   .footer-grid { grid-template-columns: 1fr; }
   .hero { min-height: 60vh; }
 }
 @media (min-width: 769px) and (max-width: 1024px) {
   .products-grid { grid-template-columns: repeat(2, 1fr); }
   .footer-grid { grid-template-columns: 1fr 1fr; }
 }

/* --- Product Card Enhanced Specs --- */
.product-card-body .p-color { display: flex; align-items: center; gap: 6px; margin-bottom: 10px; font-size: 12px; color: var(--gray-700); }
.product-card-body .p-color .color-swatch { width: 14px; height: 14px; border-radius: 50%; border: 1px solid var(--gray-300); flex-shrink: 0; }
.product-card-body .p-specs { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 16px; margin-bottom: 10px; }
.product-card-body .p-specs .spec-row { display: flex; justify-content: space-between; font-size: 12px; padding: 4px 0; border-bottom: 1px solid var(--gray-200); }
.product-card-body .p-specs .spec-label { color: var(--gray-500); }
.product-card-body .p-specs .spec-value { color: var(--gray-900); font-weight: 500; text-align: right; }
.product-card-body .p-packaging { font-size: 12px; color: var(--gray-500); margin-bottom: 10px; display: flex; gap: 12px; flex-wrap: wrap; }
.product-card-body .p-packaging span { background: var(--gray-100); padding: 2px 8px; border-radius: 4px; }

/* --- Product Detail Page --- */
.product-detail-layout {
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr);
  gap: 40px; align-items: start;
}
.product-gallery { width: 100%; max-width: 100%; min-width: 0; }
.product-main-image {
  width: 100%; aspect-ratio: 4 / 3; border: 1px solid var(--gray-200);
  background: var(--gray-100); cursor: zoom-in; padding: 0; overflow: hidden;
}
.product-main-image img {
  width: 100%; height: 100%; object-fit: contain; display: block;
}
.product-thumbs {
  display: flex; gap: 10px; margin-top: 10px; overflow-x: auto; padding-bottom: 4px;
}
.product-thumb {
  width: 86px; height: 66px; flex: 0 0 auto; border: 1px solid var(--gray-200);
  background: var(--gray-100); padding: 0; cursor: pointer;
}
.product-thumb.active { border-color: var(--primary); }
.product-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
@media (max-width: 480px) {
  .product-detail-layout { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .product-gallery { width: 100%; max-width: 100%; min-width: 0; }
  .product-main-image { width: 100%; aspect-ratio: auto; }
  .product-main-image img { width: 100%; height: auto; object-fit: contain; }
}
.product-detail-summary h1 { font-size: 28px; margin-bottom: 12px; }
.product-detail-summary p { color: var(--gray-600); line-height: 1.7; margin-bottom: 20px; }
.product-detail-section { margin-top: 48px; }
.product-detail-section h2 { font-size: 22px; margin-bottom: 18px; }
.product-videos { display: grid; gap: 16px; }
.product-videos video {
  width: 100%; max-height: 620px; background: var(--gray-900);
  border: 1px solid var(--gray-200);
}
.product-detail-specs {
  width: 100%; border-collapse: collapse; background: var(--white);
  border: 1px solid var(--gray-200);
}
.product-detail-specs td {
  padding: 12px 14px; border-bottom: 1px solid var(--gray-200);
  font-size: 14px; vertical-align: top;
}
.product-detail-specs tr:last-child td { border-bottom: none; }
.product-detail-specs td:first-child {
  width: 34%; color: var(--gray-500); font-weight: 600; background: var(--gray-100);
}
.image-lightbox-overlay {
  display: none; position: fixed; inset: 0; z-index: 300;
  background: rgba(0,0,0,.82); align-items: center; justify-content: center;
  padding: 24px;
}
.image-lightbox-overlay.open { display: flex; }
.image-lightbox-overlay img {
  max-width: min(1100px, 96vw); max-height: 90vh; object-fit: contain;
  background: var(--white);
}
.image-lightbox-overlay .close-btn {
  position: fixed; top: 18px; right: 24px; color: var(--white);
  background: transparent; border: none; font-size: 36px; cursor: pointer;
}

/* --- Spec Detail Popup --- */
.spec-popup-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 200; align-items: center; justify-content: center; padding: 20px; }
.spec-popup-overlay.open { display: flex; }
.spec-popup { background: var(--white); border-radius: var(--radius); max-width: 640px; width: 100%; max-height: 80vh; overflow-y: auto; padding: 32px; position: relative; box-shadow: var(--shadow-lg); }
.spec-popup .close-btn { position: absolute; top: 12px; right: 16px; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--gray-500); padding: 4px 8px; line-height: 1; }
.spec-popup .close-btn:hover { color: var(--gray-900); }
.spec-popup h2 { font-size: 20px; margin-bottom: 4px; }
.spec-popup .popup-desc { font-size: 14px; color: var(--gray-500); line-height: 1.6; margin-bottom: 20px; }
.spec-popup .popup-specs { width: 100%; border-collapse: collapse; margin-bottom: 20px; }
.spec-popup .popup-specs td { padding: 8px 12px; border-bottom: 1px solid var(--gray-200); font-size: 14px; }
.spec-popup .popup-specs td:first-child { color: var(--gray-500); width: 38%; font-weight: 500; }
.spec-popup .popup-specs td:last-child { color: var(--gray-900); }
.spec-popup .popup-features { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; }
.spec-popup .popup-features span { font-size: 12px; background: var(--gray-100); padding: 4px 12px; border-radius: 4px; color: var(--gray-700); }
.spec-popup .popup-actions { display: flex; gap: 12px; }