/* Huapai Lighting - B2B standalone site prototype */
:root{
  --ink:#0f172a; --muted:#64748b; --line:#e2e8f0; --bg:#f8fafc; --card:#ffffff;
  --brand:#b91c1c; --brand-dark:#7f1d1d; --brand-soft:#fef2f2;
  --dark:#0f172a; --dark-2:#1e293b;
  --ok:#059669; --warn:#d97706;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:"Segoe UI",Arial,system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.container{max-width:1160px;margin:0 auto;padding:0 20px;}

/* ===== Language switcher ===== */
.lang-select{appearance:none;-webkit-appearance:none;background:#f1f5f9 url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="10" height="6"><path d="M0 0l5 6 5-6z" fill="%2364748b"/></svg>') no-repeat right 10px center;border:1px solid var(--line);border-radius:8px;padding:7px 28px 7px 12px;font-size:13px;font-weight:600;color:var(--ink);cursor:pointer;outline:none;}
.lang-select:hover{border-color:#cbd5e1;}
.bg-dark .lang-select{background-color:#1e293b;border-color:#334155;color:#e2e8f0;}

/* ===== RTL (Arabic) ===== */
[dir="rtl"] body{direction:rtl;text-align:right;}
[dir="rtl"] .nav-links{gap:20px;}
[dir="rtl"] .section-head{margin-left:auto;margin-right:auto;}
[dir="rtl"] .crumb{text-align:right;}
[dir="rtl"] .step::before{right:auto;left:18px;}
[dir="rtl"] .hero-badges span{direction:ltr;}
[dir="rtl"] .logo{direction:ltr;}
[dir="rtl"] .footer-bottom{direction:ltr;}

/* ===== RTL / CJK / Cyrillic font stacks ===== */
html[lang="zh"] body{font-family:"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;}
html[lang="ar"] body{font-family:"Segoe UI",Tahoma,"Noto Kufi Arabic","Noto Naskh Arabic",Arial,sans-serif;}
html[lang="ru"] body{font-family:"Segoe UI","Arial",Helvetica,sans-serif;}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(6px);}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px;}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;}
.logo img{height:38px;width:auto;border-radius:6px;}
.logo .sub{display:block;font-size:10.5px;font-weight:500;color:var(--muted);letter-spacing:.5px;}
.nav-links{display:flex;gap:26px;font-size:14.5px;font-weight:600;color:var(--ink);align-items:center;}
.nav-links a:hover{color:var(--brand);}
.nav-cta{background:var(--brand);color:#fff!important;padding:9px 18px;border-radius:999px;font-size:13.5px;}
.nav-cta:hover{background:var(--brand-dark);color:#fff!important;}
.menu-toggle{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--ink);}

/* ===== Hero ===== */
.hero{background:linear-gradient(135deg,#111827 0%,#1e293b 55%,#7f1d1d 130%);color:#fff;padding:84px 0 72px;}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center;}
.hero h1{font-size:40px;line-height:1.18;margin-bottom:16px;font-weight:800;}
.hero h1 em{font-style:normal;color:#f87171;}
.hero p{color:#cbd5e1;font-size:16.5px;margin-bottom:26px;max-width:560px;}
.hero-badges{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:26px;}
.hero-badges span{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);padding:5px 14px;border-radius:999px;font-size:13px;color:#e2e8f0;}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--brand);color:#fff;padding:13px 26px;border-radius:10px;font-weight:700;font-size:15px;transition:.2s;}
.btn:hover{background:var(--brand-dark);transform:translateY(-1px);}
.btn-ghost{background:transparent;border:1.5px solid rgba(255,255,255,.5);color:#fff;}
.btn-ghost:hover{background:rgba(255,255,255,.1);border-color:#fff;}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;}
.hero-img{border-radius:16px;overflow:hidden;box-shadow:0 24px 60px rgba(0,0,0,.45);}
.hero-img img{width:100%;height:340px;object-fit:cover;}

/* ===== Section ===== */
section{padding:72px 0;}
.section-head{max-width:760px;margin:0 auto 44px;text-align:center;}
.eyebrow{display:inline-block;background:var(--brand-soft);color:var(--brand);font-size:12.5px;font-weight:700;letter-spacing:1.5px;padding:5px 14px;border-radius:999px;margin-bottom:14px;text-transform:uppercase;}
.section-head h2{font-size:30px;line-height:1.25;margin-bottom:12px;}
.section-head p{color:var(--muted);font-size:15.5px;}
.bg-dark{background:var(--dark);color:#fff;}
.bg-dark .section-head p{color:#94a3b8;}
.bg-dark .eyebrow{background:rgba(248,113,113,.15);color:#f87171;}

/* ===== Product standard cards ===== */
.std-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(255px,1fr));gap:20px;}
.std-card{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:.25s;}
.std-card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(15,23,42,.1);border-color:#d1d5db;}
.std-card .img{height:190px;overflow:hidden;}
.std-card .img img{width:100%;height:100%;object-fit:cover;transition:.4s;}
.std-card:hover .img img{transform:scale(1.05);}
.std-card .body{padding:18px 20px 20px;}
.std-card h3{font-size:17px;margin-bottom:4px;}
.std-card .std{font-size:12px;color:var(--muted);font-weight:700;letter-spacing:.5px;text-transform:uppercase;margin-bottom:8px;}
.std-card p{font-size:13.5px;color:var(--muted);margin-bottom:14px;}
.std-card .link{font-size:14px;font-weight:700;color:var(--brand);}
.std-card .link:hover{text-decoration:underline;}

/* ===== Product grid (category pages) ===== */
.pgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px;}
.pcard{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:.25s;}
.pcard:hover{transform:translateY(-3px);box-shadow:0 12px 28px rgba(15,23,42,.09);}
.pcard .img{height:170px;background:#f1f5f9;}
.pcard .img img{width:100%;height:100%;object-fit:cover;}
.pcard .body{padding:14px 16px 16px;}
.pcard h4{font-size:15px;margin-bottom:3px;}
.pcard .sku{font-size:11.5px;color:var(--muted);margin-bottom:8px;font-family:Consolas,monospace;}
.pcard p{font-size:12.5px;color:var(--muted);margin-bottom:10px;}
.pcard .tagline{display:inline-block;background:#f1f5f9;border-radius:999px;padding:2px 10px;font-size:11px;color:#334155;font-weight:600;}

/* ===== Features / about ===== */
.feat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;}
.feat{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:26px 24px;}
.feat .ic{font-size:26px;margin-bottom:12px;}
.feat h3{font-size:17px;margin-bottom:8px;}
.feat p{font-size:13.5px;color:var(--muted);}
.gallery-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;}
.gallery-grid .item{border-radius:12px;overflow:hidden;position:relative;border:1px solid var(--line);}
.gallery-grid .item img{width:100%;height:200px;object-fit:cover;transition:.4s;}
.gallery-grid .item:hover img{transform:scale(1.04);}
.gallery-grid .cap{position:absolute;left:0;right:0;bottom:0;background:linear-gradient(transparent,rgba(0,0,0,.72));color:#fff;font-size:13px;padding:26px 14px 10px;font-weight:600;}

/* ===== Steps (OEM) ===== */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:18px;counter-reset:step;}
.step{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:26px 22px;position:relative;}
.step::before{counter-increment:step;content:"0" counter(step);position:absolute;top:16px;right:18px;font-size:30px;font-weight:800;color:rgba(248,113,113,.35);}
.step h3{font-size:16px;margin-bottom:8px;color:#f87171;}
.step p{font-size:13.5px;color:#94a3b8;}

/* ===== Blog ===== */
.blog-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px;}
.post{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px 24px;transition:.25s;}
.post:hover{box-shadow:0 12px 28px rgba(15,23,42,.08);}
.post .tag{display:inline-block;background:var(--brand-soft);color:var(--brand);font-size:11.5px;font-weight:700;padding:3px 10px;border-radius:999px;margin-bottom:10px;}
.post h3{font-size:16.5px;margin-bottom:8px;line-height:1.4;}
.post h3:hover{color:var(--brand);}
.post p{font-size:13px;color:var(--muted);margin-bottom:12px;}

/* ===== Contact / CTA band ===== */
.cta-band{background:linear-gradient(135deg,#7f1d1d,#b91c1c);color:#fff;border-radius:18px;padding:52px 40px;text-align:center;}
.cta-band h2{font-size:28px;margin-bottom:10px;}
.cta-band p{color:#fecaca;margin-bottom:24px;font-size:15.5px;}
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;margin-top:14px;}
.contact-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px;text-align:center;}
.contact-card .ic{font-size:26px;margin-bottom:10px;}
.contact-card h4{font-size:15px;margin-bottom:6px;}
.contact-card a{color:var(--brand);font-weight:700;word-break:break-all;font-size:14px;}
.contact-card p{font-size:13px;color:var(--muted);}

/* ===== Footer ===== */
.site-footer{background:#0b1220;color:#94a3b8;padding:44px 0 26px;font-size:13.5px;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:32px;margin-bottom:30px;}
.footer-grid h4{color:#e2e8f0;font-size:14px;margin-bottom:12px;}
.footer-grid ul{list-style:none;}
.footer-grid li{margin-bottom:8px;}
.footer-grid a:hover{color:#f87171;}
.footer-bottom{border-top:1px solid #1e293b;padding-top:18px;text-align:center;font-size:12.5px;color:#64748b;}

/* ===== Page hero (inner) ===== */
.page-hero{background:linear-gradient(135deg,#111827,#1e293b);color:#fff;padding:64px 0 56px;}
.page-hero .crumb{font-size:12.5px;color:#94a3b8;margin-bottom:10px;letter-spacing:.5px;}
.page-hero h1{font-size:34px;margin-bottom:10px;}
.page-hero p{color:#cbd5e1;max-width:680px;font-size:15.5px;}

/* ===== Stats strip ===== */
.stats{padding:52px 0;background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.stats-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;text-align:center;}
.stat .num{font-size:36px;font-weight:800;color:var(--brand);line-height:1.15;letter-spacing:.5px;}
.stat .lbl{font-size:13px;color:var(--muted);margin-top:8px;font-weight:600;}
[dir="rtl"] .stat .num{direction:ltr;}
@media(max-width:900px){ .stats-grid{grid-template-columns:repeat(3,1fr);gap:26px 18px;} }
@media(max-width:560px){ .stats-grid{grid-template-columns:repeat(2,1fr);gap:24px 14px;} .stat .num{font-size:30px;} }

/* ===== Certifications ===== */
.cert-box{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px 28px;display:grid;grid-template-columns:1.2fr .8fr;gap:26px;align-items:center;}
.cert-info h3{font-size:17px;margin-bottom:10px;display:flex;align-items:center;gap:8px;}
.cert-info ul{list-style:none;}
.cert-info li{font-size:14px;color:var(--muted);margin-bottom:9px;display:flex;gap:10px;align-items:baseline;}
.cert-info li b{color:var(--ink);min-width:108px;font-weight:600;flex-shrink:0;}
.cert-info li span{word-break:break-all;}
.cert-badge{background:var(--brand-soft);border:1px solid #fecaca;border-radius:12px;padding:22px;text-align:center;}
.cert-badge .ce{font-size:34px;font-weight:800;color:var(--brand);letter-spacing:1px;}
.cert-badge p{font-size:12.5px;color:#7f1d1d;margin-top:6px;line-height:1.6;}
.cert-view{display:inline-block;margin-top:16px;background:var(--brand);color:#fff;padding:10px 20px;border-radius:9px;font-size:13.5px;font-weight:700;}
.cert-view:hover{background:var(--brand-dark);color:#fff;}
@media(max-width:700px){ .cert-box{grid-template-columns:1fr;} }

/* ===== Article (blog post) ===== */
.article-wrap{max-width:800px;margin:0 auto;padding:52px 20px 72px;}
.article-meta{display:flex;gap:14px;flex-wrap:wrap;align-items:center;margin-bottom:20px;font-size:13px;color:var(--muted);}
.article-meta .dot{opacity:.4;}
.article h1{font-size:32px;line-height:1.3;margin-bottom:12px;}
.article .lead{font-size:17px;color:#334155;margin-bottom:26px;line-height:1.75;}
.article h2{font-size:22px;margin:36px 0 14px;padding-bottom:8px;border-bottom:2px solid var(--brand-soft);}
.article h3{font-size:17px;margin:22px 0 10px;}
.article p{margin-bottom:16px;font-size:15.5px;line-height:1.8;color:#1f2937;}
.article ul,.article ol{margin:0 0 16px 24px;}
.article li{margin-bottom:8px;font-size:15px;line-height:1.7;}
.article table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px;}
.article table th{background:#f8fafc;padding:10px 12px;border:1px solid var(--line);text-align:left;}
.article table td{padding:9px 12px;border:1px solid var(--line);}
.article .callout{background:#f0fdf4;border:1px solid #bbf7d0;border-radius:10px;padding:16px 18px;margin:20px 0;font-size:14.5px;}
.article .callout b{color:#166534;}
.article .warn-box{background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:14px 16px;margin:20px 0;font-size:14px;color:#92400e;}
.article a{color:var(--brand);font-weight:600;}
.article a:hover{text-decoration:underline;}
.article .back{display:inline-block;margin-bottom:22px;font-size:14px;font-weight:600;color:var(--muted);}
.article .back:hover{color:var(--brand);}
.article-cta{margin-top:44px;background:var(--brand-soft);border:1px solid #fecaca;border-radius:14px;padding:30px 28px;text-align:center;}
.article-cta h3{font-size:19px;color:var(--brand-dark);margin-bottom:8px;border:none;}
.article-cta p{color:#7f1d1d;font-size:14.5px;margin-bottom:0;}
.article-cta .btn{margin-top:14px;display:inline-flex;}

/* ===== Tables (spec placeholder) ===== */
.spec-table{width:100%;border-collapse:collapse;font-size:13.5px;background:var(--card);border-radius:10px;overflow:hidden;}
.spec-table th{background:#f1f5f9;text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);}
.spec-table td{padding:9px 14px;border-bottom:1px solid var(--line);}
.spec-table td:last-child{color:var(--muted);}
.note-box{background:#fffbeb;border:1px solid #fde68a;color:#92400e;border-radius:10px;padding:14px 16px;font-size:13.5px;margin-top:18px;}

/* ===== Responsive ===== */
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;padding:18px 20px;gap:16px;border-bottom:1px solid var(--line);}
  .nav-links.open{display:flex;}
  .menu-toggle{display:block;}
  .hero h1{font-size:30px;}
}
@media(max-width:560px){ .footer-grid{grid-template-columns:1fr;} section{padding:52px 0;} }