/* 基础 */
*{margin:0;padding:0;box-sizing:border-box;}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color:#2b2f33;background:#fff;line-height:1.7;}
a{text-decoration:none;color:inherit;}
ul{list-style:none;}
img{max-width:100%;display:block;}
.container{max-width:1100px;margin:0 auto;padding:0 20px;}

/* 顶部 */
.header{position:sticky;top:0;z-index:100;background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.06);}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:76px;gap:16px;}
.brand{display:flex;align-items:center;gap:12px;}
.brand-logo{width:52px;height:52px;}
.brand-text strong{display:block;font-size:17px;color:#1a2b4a;letter-spacing:1px;}
.brand-text span{display:block;font-size:10px;color:#999;}
.nav{display:flex;gap:28px;}
.nav a{font-size:15px;color:#444;padding:6px 0;border-bottom:2px solid transparent;transition:.2s;}
.nav a:hover,.nav a.active{color:#c0392b;border-color:#c0392b;}
.header-tel{text-align:right;}
.tel-label{display:block;font-size:12px;color:#999;}
.header-tel strong{font-size:17px;color:#c0392b;}

/* 主视觉 */
.hero{background:linear-gradient(135deg,#2c3e50 0%,#34495e 60%,#4a5a6a 100%);color:#fff;overflow:hidden;}
.hero-inner{display:flex;align-items:center;justify-content:space-between;padding:70px 20px;gap:40px;}
.hero-text h1{font-size:42px;letter-spacing:2px;}
.hero-sub{font-size:14px;letter-spacing:4px;color:#e67e22;margin:8px 0 18px;text-transform:uppercase;}
.hero-desc{font-size:15px;color:#d5dbe0;line-height:2;}
.hero-btns{margin-top:28px;display:flex;gap:14px;}
.btn{display:inline-block;padding:12px 34px;border-radius:4px;font-size:15px;transition:.2s;cursor:pointer;border:none;}
.btn-primary{background:#c0392b;color:#fff;}
.btn-primary:hover{background:#a93226;}
.btn-outline{border:1px solid #fff;color:#fff;background:transparent;}
.btn-outline:hover{background:rgba(255,255,255,.12);}
.btn-lg{width:100%;font-size:16px;padding:14px;}
.hero-img{flex-shrink:0;}
.float-img{width:300px;filter:drop-shadow(0 18px 30px rgba(0,0,0,.4));animation:float 4s ease-in-out infinite;}
@keyframes float{0%,100%{transform:translateY(0);}50%{transform:translateY(-14px);}}

/* 特性 */
.features{background:#f7f8fa;border-bottom:1px solid #eee;}
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:34px 20px;}
.feature{text-align:center;}
.f-icon{font-size:34px;}
.feature h3{font-size:16px;margin:6px 0 4px;color:#1a2b4a;}
.feature p{font-size:13px;color:#777;}

/* 区块 */
.section{padding:70px 0;}
.section-gray{background:#f7f8fa;}
.section-dark{background:#1f2733;color:#dfe4ea;}
.section-title{text-align:center;font-size:30px;color:#1a2b4a;margin-bottom:10px;letter-spacing:2px;}
.section-title.left{text-align:left;}
.section-title .en{font-size:14px;color:#c0392b;margin-left:10px;letter-spacing:3px;font-weight:normal;}
.section-title.light{color:#fff;}
.section-desc{text-align:center;color:#888;margin-bottom:36px;font-size:14px;}

/* 产品 */
.products-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:30px;}
.product-card{background:#fff;border:1px solid #e8e8e8;border-radius:8px;padding:26px 22px;position:relative;transition:.25s;}
.product-card:hover{transform:translateY(-6px);box-shadow:0 14px 30px rgba(0,0,0,.1);border-color:#c0392b;}
.p-tag{position:absolute;top:14px;right:14px;background:#fdf0ee;color:#c0392b;font-size:12px;padding:2px 10px;border-radius:20px;}
.product-card h3{font-size:18px;color:#1a2b4a;margin-bottom:2px;}
.p-en{font-size:10px;color:#aaa;letter-spacing:1px;margin-bottom:12px;text-transform:uppercase;}
.product-card ul li{font-size:13px;color:#666;padding:4px 0;border-bottom:1px dashed #eee;}
.product-card ul li:last-child{border:none;}
.spec-note{margin-top:34px;background:#fdf6ee;border-left:4px solid #e67e22;padding:18px 22px;font-size:14px;color:#6b5b45;border-radius:0 6px 6px 0;line-height:2;}
.spec-note span{font-size:13px;color:#999;}

/* 关于 */
.about-grid{display:grid;grid-template-columns:2fr 1fr;gap:44px;align-items:center;}
.about-text p{margin:14px 0;font-size:15px;color:#555;text-align:justify;}
.about-list{margin-top:16px;}
.about-list li{padding:6px 0;font-size:14px;color:#444;}
.about-card{background:#fff;border:1px solid #e8e8e8;border-radius:10px;padding:34px 26px;text-align:center;box-shadow:0 8px 24px rgba(0,0,0,.05);}
.about-card img{width:90px;margin:0 auto 16px;}
.about-card h3{color:#1a2b4a;margin-bottom:8px;}
.about-card p{font-size:13px;color:#888;}

/* 询盘表单 */
.inquiry-form{max-width:680px;margin:0 auto;background:#fff;border:1px solid #e8e8e8;border-radius:10px;padding:38px 34px;box-shadow:0 8px 24px rgba(0,0,0,.05);}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.form-group{margin-bottom:18px;}
.form-group label{display:block;font-size:14px;color:#444;margin-bottom:6px;}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:11px 14px;border:1px solid #ddd;border-radius:5px;font-size:14px;font-family:inherit;transition:.2s;}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:#c0392b;box-shadow:0 0 0 3px rgba(192,57,43,.08);}
.form-tip{text-align:center;margin-top:14px;font-size:14px;color:#27ae60;min-height:20px;}

/* 联系 */
.contact-grid{display:grid;grid-template-columns:2fr 1fr;gap:40px;align-items:start;}
.contact-list li{padding:8px 0;font-size:15px;}
.qr-box{text-align:center;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:10px;padding:24px;}
.qr-box p{font-size:14px;}
.qr-placeholder{width:150px;height:150px;margin:14px auto;border:2px dashed rgba(255,255,255,.3);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:13px;color:rgba(255,255,255,.4);}
.qr-box .small{font-size:11px;color:rgba(255,255,255,.35);}

/* 页脚 */
.footer{background:#151b24;color:#8a93a0;padding:26px 0;text-align:center;font-size:13px;}
.footer a{color:#8a93a0;}
.footer a:hover{color:#fff;}
.footer .divider{margin:0 8px;}

/* 响应式 */
@media(max-width:900px){
  .hero-inner{flex-direction:column;text-align:center;padding:50px 20px;}
  .hero-btns{justify-content:center;}
  .float-img{width:220px;}
  .features-grid{grid-template-columns:repeat(2,1fr);}
  .products-grid{grid-template-columns:repeat(2,1fr);}
  .about-grid,.contact-grid{grid-template-columns:1fr;}
  .nav{display:none;}
  .section{padding:50px 0;}
  .section-title{font-size:24px;}
}

/* 二维码 */
.qr-row{display:flex;gap:18px;justify-content:center;}
.qr-img{width:140px;height:140px;border-radius:8px;background:#fff;padding:6px;}
@media(max-width:900px){.qr-img{width:110px;height:110px;}}