/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC","Helvetica Neue",Arial,sans-serif;color:#333;line-height:1.75;background:#fff}
.container{max-width:1160px;margin:0 auto;padding:0 24px}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%;display:block}

/* ===== Top Bar ===== */
.top-bar{background:#f5f0e8;color:#999;text-align:center;font-size:12px;padding:6px 16px;letter-spacing:1px}

/* ===== Navbar ===== */
.navbar{background:#fff;position:sticky;top:0;z-index:100;border-bottom:1px solid #eee}
.nav-container{max-width:1160px;margin:0 auto;padding:8px 24px;display:flex;justify-content:space-between;align-items:center}
.logo{display:flex;align-items:center}
.logo-img{height:168px;width:auto;display:block}
.logo-cn{font-size:20px;font-weight:700;color:#1a1a1a}
.logo-divider{width:1px;height:18px;background:#ccc}
.logo-sub{font-size:13px;color:#888;font-weight:400}
.nav-links{display:flex;gap:36px;align-items:center}
.nav-links a{color:#555;font-size:15px;transition:color .2s;padding:4px 0}
.nav-links a:hover,.nav-links a.active{color:#c0392b}
.lang-toggle{background:none;border:1px solid #ccc;color:#666;padding:5px 12px;border-radius:3px;cursor:pointer;font-size:12px;transition:all .2s}
.lang-toggle:hover{border-color:#c0392b;color:#c0392b}
.mobile-menu-btn{display:none;background:none;border:none;font-size:22px;cursor:pointer;color:#333}

/* ===== Hero ===== */
.hero{position:relative;background:linear-gradient(rgba(255,255,255,.15),rgba(255,255,255,.3)),url('https://images.unsplash.com/photo-1499126167718-c87f5c1387e8?w=1600&q=80') center/cover no-repeat;min-height:520px;display:flex;align-items:flex-start;justify-content:center;overflow:hidden;padding:80px 8% 0}
.hero-overlay{position:absolute;inset:0;background:transparent}
.hero-content{position:relative;z-index:1;color:#1a1a1a;display:flex;justify-content:space-between;align-items:flex-start;width:100%}
.hero-text{text-align:left}
.hero-label{font-size:12px;letter-spacing:4px;color:#c0392b;margin-bottom:20px;text-transform:uppercase}
.hero-title{font-size:clamp(32px,5vw,56px);font-weight:700;line-height:1.2;margin-bottom:16px;color:#1a1a1a}
.hero-title span{color:#1a1a1a}
.hero-desc{font-size:16px;color:#666;margin-bottom:0;max-width:500px;margin-left:auto}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap;margin-top:120px}

/* ===== Buttons ===== */
.btn-primary{display:inline-block;background:#c0392b;color:#fff;padding:14px 38px;border-radius:4px;font-size:15px;font-weight:600;border:none;cursor:pointer;transition:background .2s;letter-spacing:.5px}
.btn-primary:hover{background:#a93226}
.btn-outline{display:inline-block;border:2px solid #c0392b;color:#c0392b;padding:14px 38px;border-radius:4px;font-size:15px;font-weight:600;transition:all .2s;letter-spacing:.5px}
.btn-outline:hover{background:#c0392b;color:#fff}

/* ===== Sections ===== */
.section{padding:80px 24px}
.section.bg-light{background:#f9f8f6}
.section-title{text-align:center;font-size:28px;font-weight:700;margin-bottom:12px;color:#1a1a1a}
.section-title + p{text-align:center;color:#888;margin-bottom:48px;font-size:15px}

/* ===== Promise Grid (对标kongguan四图标) ===== */
.promise-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.promise-item{text-align:center;padding:48px 28px;border-right:1px solid #eee;border-top:1px solid #eee;border-bottom:1px solid #eee}
.promise-item:first-child{border-left:1px solid #eee}
.pm-icon{width:120px;height:120px;margin:0 auto 20px;display:flex;align-items:center;justify-content:center}
.pm-icon img{width:100%;height:100%;object-fit:contain}
.pm-icon-fallback{font-size:32px}
.promise-item h4{font-size:17px;color:#1a1a1a;margin-bottom:10px}
.promise-item p{font-size:14px;color:#888;line-height:1.6}
.promise-item hr{margin:20px auto 0;width:40px;border:none;border-top:2px solid #c0392b}

/* ===== About Row (左图右文) ===== */
.about-row{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.about-img-placeholder{background:#f0ebe0;border-radius:4px;display:flex;align-items:center;justify-content:center;height:380px;font-size:28px;color:#c0392b;font-weight:700;text-align:center;line-height:1.4}
.about-text h2{font-size:28px;line-height:1.4;margin-bottom:24px;color:#1a1a1a}
.about-text p{color:#666;font-size:15px;margin-bottom:16px;line-height:1.8}

/* ===== Product Video ===== */
.product-video{max-width:800px;margin:0 auto 40px}
.product-video video{width:100%;display:block;border-radius:4px}

/* ===== Product Grid ===== */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.product-card{background:#fff;border:1px solid #eee;border-radius:4px;padding:32px 20px 24px;text-align:center;transition:transform .2s,box-shadow .2s;display:block;color:inherit}
.product-card:hover{transform:translateY(-3px);box-shadow:0 6px 20px rgba(0,0,0,.08)}
.pc-img{width:160px;height:160px;margin:0 auto 16px;display:flex;align-items:center;justify-content:center}
.pc-img img{width:100%;height:100%;object-fit:contain}
.pc-img.oem{background:#f5f0e8;color:#c0392b;font-size:18px;font-weight:700;border-radius:8px;width:160px;height:160px;display:flex;align-items:center;justify-content:center}
.product-card h3{font-size:18px;color:#1a1a1a;margin-bottom:6px}
.product-card p{color:#999;font-size:13px}

/* ===== CTA ===== */
.cta{background:#c0392b;text-align:center;color:#fff}
.cta h2{font-size:28px;margin-bottom:8px;color:#fff}
.cta p{font-size:16px;color:#f5d0b8;margin-bottom:28px}
.cta .btn-primary{background:#fff;color:#c0392b}
.cta .btn-primary:hover{background:#f5f5f5}

/* ===== Banner Image ===== */
.banner-img{max-width:1160px;margin:0 auto;padding:0 24px 24px}
.banner-img img{width:100%;height:auto;display:block;border-radius:4px}

/* ===== Page Banner ===== */
.page-banner{background:#f9f8f6;border-bottom:1px solid #eee;text-align:center;padding:56px 20px}
.page-banner h1{font-size:30px;color:#1a1a1a;margin-bottom:6px}
.page-banner p{color:#999;font-size:15px}

/* ===== Product Detail ===== */
.product-detail{display:grid;grid-template-columns:280px 1fr;gap:48px;align-items:center;margin-bottom:56px;padding-bottom:48px;border-bottom:1px solid #eee}
.product-detail.reverse{grid-template-columns:1fr 280px}
.product-detail:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}
.pd-image-wrap{width:280px;height:280px;display:flex;align-items:center;justify-content:center}
.pd-image-wrap img{width:100%;height:100%;object-fit:contain}
.pd-placeholder{width:280px;height:200px;background:#f5f0e8;border-radius:4px;display:flex;align-items:center;justify-content:center;font-size:36px;color:#c0392b;font-weight:700}
.pd-tag{display:inline-block;background:transparent;border:1px solid #c0392b;color:#c0392b;padding:3px 12px;border-radius:3px;font-size:12px;margin-bottom:14px;letter-spacing:1px}
.pd-info h2{font-size:26px;margin-bottom:6px;color:#1a1a1a}
.pd-info > p{color:#666;margin-bottom:18px;font-size:15px;line-height:1.8}
.pd-specs{display:flex;flex-direction:column;gap:5px;font-size:14px;color:#888}
.pd-specs strong{color:#555;font-weight:600}

/* ===== Contact Page ===== */
.contact-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:48px;align-items:start}
.contact-form-wrapper h3,.contact-info-sidebar h3{font-size:22px;margin-bottom:24px;color:#1a1a1a}
.contact-form label{display:block;font-size:14px;font-weight:600;margin-bottom:5px;color:#555}
.contact-form input,.contact-form select,.contact-form textarea{width:100%;padding:10px 14px;border:1px solid #ddd;border-radius:3px;font-size:15px;font-family:inherit;background:#fff;transition:border-color .2s}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{outline:none;border-color:#c0392b}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-group{margin-bottom:18px}
.btn-full{width:100%}
.form-note{text-align:center;font-size:13px;color:#aaa;margin-top:10px}

/* ===== Contact Sidebar ===== */
.contact-card{background:#f9f8f6;padding:28px;border-radius:4px}
.contact-item{display:flex;gap:14px;margin-bottom:22px;padding-bottom:22px;border-bottom:1px solid #e5e5e5}
.contact-item:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}
.ci-dot{width:10px;height:10px;background:#c0392b;border-radius:50%;margin-top:4px;flex-shrink:0}
.contact-item strong{display:block;font-size:15px;margin-bottom:2px;color:#1a1a1a}
.contact-item p{color:#888;font-size:14px;line-height:1.5}
.ci-small{font-size:12px;color:#bbb}
.contact-hours{margin-top:24px;padding-top:20px;border-top:1px solid #e5e5e5}
.contact-hours h4{font-size:15px;margin-bottom:6px;color:#333}
.contact-hours p{font-size:13px;color:#999}

/* ===== Footer ===== */
.footer{background:#f5f0e8;color:#666;padding:48px 24px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px}
.footer-col h4{color:#8b6914;margin-bottom:12px;font-size:15px;font-weight:600}
.footer-col p{margin-bottom:5px}
.footer-col a{display:block;color:#888;margin-bottom:5px;transition:color .2s}
.footer-col a:hover{color:#c0392b}
.footer-small{font-size:12px;color:#aaa;margin-top:10px}

/* ===== Mobile ===== */
@media (max-width:768px){
  .hero{min-height:400px}
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:20px;gap:16px;border-bottom:1px solid #eee;box-shadow:0 4px 12px rgba(0,0,0,.08)}
  .nav-links.open{display:flex}
  .mobile-menu-btn{display:block}
  .promise-grid{grid-template-columns:repeat(2,1fr)}
  .promise-item{border:1px solid #eee;padding:32px 16px}
  .promise-item:first-child,.promise-item:nth-child(2){border-top:none}
  .promise-item:nth-child(2n){border-right:none}
  .about-row{grid-template-columns:1fr;gap:32px}
  .about-img-placeholder{height:220px}
  .product-grid{grid-template-columns:repeat(2,1fr)}
  .product-detail,.product-detail.reverse{grid-template-columns:1fr;gap:24px}
  .pd-placeholder{width:100%;height:160px;font-size:28px}
  .contact-grid{grid-template-columns:1fr;gap:32px}
  .form-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:24px}
}
@media (max-width:480px){
  .promise-grid{grid-template-columns:1fr}
  .product-grid{grid-template-columns:1fr}
}