/* ================================================
   昆山米林五金塑胶有限公司 官网样式
   配色：工业蓝 + 钢铁灰 + 活力橙（工业 B2B 最佳实践）
   ================================================ */

:root{
  --blue:#0A4D8C;        /* 主色 工业蓝 */
  --blue-dark:#083A6B;   /* 深蓝 */
  --blue-light:#E8F1FA;  /* 浅蓝底 */
  --orange:#FF6B1A;      /* 强调色 活力橙 (PU/工业) */
  --orange-dark:#E85A0C;
  --gray:#5A6B7B;        /* 钢铁灰 文字 */
  --gray-dark:#2B3742;   /* 深灰 标题 */
  --gray-light:#F4F6F8;  /* 浅灰底 */
  --border:#E2E8EE;
  --white:#ffffff;
  --shadow:0 6px 24px rgba(10,77,140,.08);
  --shadow-hover:0 12px 36px rgba(10,77,140,.16);
  --radius:10px;
  --maxw:1200px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--gray);
  line-height:1.7;
  background:var(--white);
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;transition:.25s}
ul{list-style:none}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--blue-dark);color:#cfe0f0;font-size:13px}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;height:38px}
.topbar-contact a{margin-left:20px;color:#cfe0f0}
.topbar-contact a:hover{color:var(--white)}

/* ---------- 导航 ---------- */
.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);box-shadow:0 1px 0 var(--border);transition:.3s}
.header.scrolled{box-shadow:0 4px 20px rgba(0,0,0,.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:74px}
.logo{display:flex;align-items:center;gap:12px}
.logo-mark{
  width:44px;height:44px;border-radius:9px;
  background:linear-gradient(135deg,var(--blue),var(--blue-dark));
  color:#fff;font-weight:800;font-size:17px;letter-spacing:.5px;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 12px rgba(10,77,140,.3);
}
.logo-text strong{display:block;font-size:19px;color:var(--gray-dark);line-height:1.2}
.logo-text small{display:block;font-size:11px;color:var(--gray);letter-spacing:1.5px}
.nav{display:flex;gap:6px}
.nav a{padding:10px 16px;border-radius:8px;font-size:15px;font-weight:500;color:var(--gray-dark);position:relative}
.nav a:hover{color:var(--blue);background:var(--blue-light)}
.nav a.active{color:var(--blue)}
.nav a.active::after{content:"";position:absolute;left:16px;right:16px;bottom:2px;height:3px;border-radius:3px;background:var(--orange)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{width:26px;height:2.5px;background:var(--gray-dark);border-radius:2px;transition:.3s}

/* ---------- 按钮 ---------- */
.btn{display:inline-block;padding:13px 30px;border-radius:8px;font-weight:600;font-size:15px;cursor:pointer;border:2px solid transparent;transition:.25s;text-align:center}
.btn-primary{background:var(--orange);color:#fff;border-color:var(--orange)}
.btn-primary:hover{background:var(--orange-dark);border-color:var(--orange-dark);transform:translateY(-2px);box-shadow:0 8px 20px rgba(255,107,26,.35)}
.btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.7)}
.btn-outline:hover{background:#fff;color:var(--blue)}
.section .btn-outline{color:var(--blue);border-color:var(--blue)}
.section .btn-outline:hover{background:var(--blue);color:#fff}
.btn-lg{padding:16px 40px;font-size:17px}
.btn-sm{padding:10px 22px;font-size:14px}

/* ---------- Hero ---------- */
.hero{position:relative;color:#fff;overflow:hidden}
.hero-bg{
  position:absolute;inset:0;
  background:linear-gradient(120deg,var(--blue-dark) 0%,var(--blue) 55%,#0d5ba6 100%);
}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background-image:
    radial-gradient(circle at 85% 20%,rgba(255,107,26,.25),transparent 40%),
    radial-gradient(circle at 15% 90%,rgba(255,255,255,.08),transparent 35%),
    repeating-linear-gradient(45deg,rgba(255,255,255,.03) 0 2px,transparent 2px 24px);
}
.hero-inner{position:relative;padding:96px 24px 108px;max-width:var(--maxw)}
.hero-content{max-width:660px}
.hero-tag{display:inline-block;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);padding:7px 18px;border-radius:30px;font-size:14px;margin-bottom:22px}
.hero h1{font-size:44px;line-height:1.25;font-weight:800;color:#fff;margin-bottom:22px}
.hero h1 .accent{color:var(--orange)}
.hero p{font-size:17px;color:rgba(255,255,255,.9);margin-bottom:34px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}

/* ---------- 通用区块 ---------- */
.section{padding:82px 0}
.section-alt{background:var(--gray-light)}
.section-head{text-align:center;max-width:640px;margin:0 auto 52px}
.section-eyebrow{display:inline-block;color:var(--orange);font-weight:700;font-size:13px;letter-spacing:2px;margin-bottom:10px}
.section-head h2{font-size:34px;color:var(--gray-dark);font-weight:800;margin-bottom:14px}
.section-sub{font-size:16px;color:var(--gray)}
.center-btn{text-align:center;margin-top:44px}

.grid{display:grid;gap:26px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

/* ---------- 优势卡片 ---------- */
.feature-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:34px 26px;text-align:center;transition:.3s}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:transparent}
.feature-icon{width:64px;height:64px;margin:0 auto 18px;border-radius:16px;background:var(--blue-light);display:flex;align-items:center;justify-content:center;font-size:30px}
.feature-card:hover .feature-icon{background:var(--orange);}
.feature-card h3{font-size:19px;color:var(--gray-dark);margin-bottom:10px}
.feature-card p{font-size:14.5px}

/* ---------- 产品卡片 ---------- */
.product-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:.3s}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:transparent}
.product-thumb{height:190px;position:relative;display:flex;align-items:center;justify-content:center}
.product-thumb span{font-size:56px;font-weight:800;color:rgba(255,255,255,.85);letter-spacing:2px}
.thumb-1{background:linear-gradient(135deg,#0A4D8C,#0d5ba6)}
.thumb-2{background:linear-gradient(135deg,#5A6B7B,#3d4b58)}
.thumb-3{background:linear-gradient(135deg,#E85A0C,#FF6B1A)}
.thumb-4{background:linear-gradient(135deg,#0d5ba6,#083A6B)}
.thumb-5{background:linear-gradient(135deg,#3d4b58,#5A6B7B)}
.product-thumb::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(45deg,rgba(255,255,255,.04) 0 3px,transparent 3px 20px)}
.product-body{padding:24px;flex:1;display:flex;flex-direction:column}
.product-body h3{font-size:19px;color:var(--gray-dark);margin-bottom:10px}
.product-body p{font-size:14.5px;flex:1}
.product-link{color:var(--orange);font-weight:600;margin-top:14px;font-size:14.5px}
.product-card:hover .product-link{letter-spacing:1px}
.product-card-cta{background:linear-gradient(135deg,var(--blue-light),#fff);border:2px dashed var(--blue)}
.cta-body{justify-content:center;text-align:center;align-items:center}
.cta-body h3{color:var(--blue)}
.cta-body .btn{margin-top:16px}

/* ---------- 数据条 ---------- */
.stats{background:var(--gray-dark);color:#fff;padding:56px 0}
.stat{text-align:center}
.stat strong{display:block;font-size:44px;font-weight:800;color:var(--orange);line-height:1}
.stat span{font-size:15px;color:#c3ccd4}

/* ---------- 应用预览 ---------- */
.app-preview{gap:18px}
.app-item{background:#fff;border:1px solid var(--border);border-radius:10px;padding:24px;font-size:17px;font-weight:600;color:var(--gray-dark);display:flex;align-items:center;gap:14px;transition:.25s}
.app-item:hover{border-color:var(--orange);box-shadow:var(--shadow);transform:translateX(4px)}
.app-ico{font-size:26px}

/* ---------- CTA 横幅 ---------- */
.cta-band{background:linear-gradient(120deg,var(--blue),var(--blue-dark));color:#fff;padding:60px 0}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap}
.cta-band h2{font-size:30px;color:#fff;margin-bottom:8px}
.cta-band p{color:rgba(255,255,255,.9);font-size:16px}

/* ---------- 页脚 ---------- */
.footer{background:var(--gray-dark);color:#aeb9c3;padding-top:60px;font-size:14.5px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:44px}
.footer-brand p{margin-top:18px;line-height:1.8}
.logo-footer .logo-text strong{color:#fff}
.logo-footer .logo-text small{color:#8b98a4}
.footer h4{color:#fff;font-size:16px;margin-bottom:18px}
.footer-col li{margin-bottom:11px}
.footer-col a:hover{color:var(--orange)}
.footer-contact li{margin-bottom:11px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0}
.footer-bottom .container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:13.5px;color:#8b98a4}

/* ---------- 页面通用 Banner（子页） ---------- */
.page-banner{position:relative;color:#fff;padding:70px 0;text-align:center;overflow:hidden}
.page-banner .hero-bg{position:absolute;inset:0}
.page-banner-inner{position:relative}
.page-banner h1{font-size:38px;color:#fff;font-weight:800;margin-bottom:12px}
.page-banner p{color:rgba(255,255,255,.9);font-size:16px}
.breadcrumb{position:relative;background:var(--gray-light);border-bottom:1px solid var(--border);font-size:14px;padding:14px 0;color:var(--gray)}
.breadcrumb a:hover{color:var(--blue)}
.breadcrumb .sep{margin:0 8px;color:#b8c2cc}

/* ---------- 产品详情列表（products 页） ---------- */
.prod-detail{display:grid;grid-template-columns:340px 1fr;gap:36px;align-items:center;padding:36px 0;border-bottom:1px solid var(--border)}
.prod-detail:nth-child(even){direction:rtl}
.prod-detail:nth-child(even) > *{direction:ltr}
.prod-detail-img{height:240px;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}
.prod-detail-img span{font-size:60px;font-weight:800;color:rgba(255,255,255,.9)}
.prod-detail-img::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(45deg,rgba(255,255,255,.05) 0 3px,transparent 3px 22px)}
.prod-detail-info h3{font-size:24px;color:var(--gray-dark);margin-bottom:6px}
.prod-detail-info .en{color:var(--orange);font-size:13px;letter-spacing:1px;font-weight:600;margin-bottom:14px;display:block}
.prod-detail-info p{margin-bottom:16px}
.tag-list{display:flex;flex-wrap:wrap;gap:10px}
.tag{background:var(--blue-light);color:var(--blue);padding:6px 14px;border-radius:20px;font-size:13.5px;font-weight:500}

/* ---------- 应用领域卡片 ---------- */
.app-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:.3s}
.app-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.app-card-top{height:150px;display:flex;align-items:center;justify-content:center;font-size:52px}
.app-card-body{padding:24px}
.app-card-body h3{color:var(--gray-dark);font-size:19px;margin-bottom:10px}
.app-card-body p{font-size:14.5px}

/* ---------- 关于我们 ---------- */
.about-intro{display:grid;grid-template-columns:1.1fr 1fr;gap:50px;align-items:center}
.about-intro h2{font-size:30px;color:var(--gray-dark);margin-bottom:20px}
.about-intro p{margin-bottom:16px}
.about-visual{height:360px;border-radius:16px;background:linear-gradient(135deg,var(--blue),var(--blue-dark));position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-hover)}
.about-visual::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(45deg,rgba(255,255,255,.05) 0 3px,transparent 3px 24px)}
.about-visual .mark{position:relative;color:rgba(255,255,255,.9);font-size:80px;font-weight:800;letter-spacing:4px}
.value-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:30px 26px;transition:.3s}
.value-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.value-card .num{font-size:34px;font-weight:800;color:var(--blue-light);-webkit-text-stroke:1px var(--blue);margin-bottom:12px}
.value-card h3{color:var(--gray-dark);font-size:19px;margin-bottom:10px}
.process-flow{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;counter-reset:step}
.process-step{flex:1;min-width:150px;text-align:center;position:relative}
.process-step .circle{width:70px;height:70px;margin:0 auto 16px;border-radius:50%;background:var(--blue-light);color:var(--blue);font-size:28px;font-weight:800;display:flex;align-items:center;justify-content:center;border:3px solid var(--blue)}
.process-step h4{color:var(--gray-dark);font-size:17px;margin-bottom:6px}
.process-step p{font-size:13.5px}

/* ---------- 联系我们 ---------- */
.contact-layout{display:grid;grid-template-columns:1fr 1.1fr;gap:44px}
.contact-info-card{background:linear-gradient(135deg,var(--blue),var(--blue-dark));color:#fff;border-radius:16px;padding:40px 34px;position:relative;overflow:hidden}
.contact-info-card::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 90% 10%,rgba(255,107,26,.3),transparent 45%)}
.contact-info-card > *{position:relative}
.contact-info-card h3{color:#fff;font-size:24px;margin-bottom:10px}
.contact-info-card .lead{color:rgba(255,255,255,.85);margin-bottom:30px}
.ci-item{display:flex;gap:16px;margin-bottom:24px;align-items:flex-start}
.ci-item .ci-ico{width:46px;height:46px;flex-shrink:0;border-radius:12px;background:rgba(255,255,255,.15);display:flex;align-items:center;justify-content:center;font-size:20px}
.ci-item h4{color:#fff;font-size:15px;margin-bottom:3px}
.ci-item p{color:rgba(255,255,255,.85);font-size:14.5px}
.contact-form{background:#fff;border:1px solid var(--border);border-radius:16px;padding:38px 34px;box-shadow:var(--shadow)}
.contact-form h3{color:var(--gray-dark);font-size:22px;margin-bottom:6px}
.contact-form .form-sub{margin-bottom:26px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.form-group{margin-bottom:20px}
.form-group label{display:block;font-size:14px;color:var(--gray-dark);font-weight:600;margin-bottom:8px}
.form-group label .req{color:var(--orange)}
.form-group input,.form-group select,.form-group textarea{
  width:100%;padding:12px 14px;border:1.5px solid var(--border);border-radius:8px;font-size:15px;font-family:inherit;color:var(--gray-dark);transition:.2s;background:#fff;
}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(10,77,140,.12)}
.form-group textarea{resize:vertical;min-height:120px}
.form-group input.error,.form-group textarea.error{border-color:#e03131}
.err-msg{color:#e03131;font-size:13px;margin-top:5px;display:none}
.err-msg.show{display:block}
.form-note{font-size:13px;color:var(--gray);margin-top:6px}
.form-success{display:none;background:#e6f7ed;border:1px solid #34c759;color:#1a7a3f;padding:14px 18px;border-radius:8px;margin-bottom:20px;font-size:14.5px}
.form-success.show{display:block}
.map-embed{margin-top:44px;border-radius:16px;overflow:hidden;height:320px;background:var(--gray-light);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;flex-direction:column;color:var(--gray)}
.map-embed .map-ico{font-size:48px;margin-bottom:10px}

/* ---------- 通用富文本 ---------- */
.rich h2{font-size:26px;color:var(--gray-dark);margin:30px 0 16px}
.rich p{margin-bottom:14px}

/* ---------- 回到顶部 ---------- */
.back-top{position:fixed;right:26px;bottom:26px;width:48px;height:48px;border-radius:12px;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-size:22px;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(10px);transition:.3s;box-shadow:var(--shadow-hover);z-index:90;border:none}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{background:var(--orange)}

/* ---------- 滚动淡入动画 ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:.6s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ================= 响应式 ================= */
@media(max-width:980px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .about-intro,.contact-layout{grid-template-columns:1fr}
  .prod-detail{grid-template-columns:1fr;direction:ltr !important}
  .prod-detail:nth-child(even){direction:ltr}
  .hero h1{font-size:36px}
}
@media(max-width:680px){
  .topbar{display:none}
  .nav{position:fixed;top:74px;right:0;width:70%;max-width:280px;height:calc(100vh - 74px);background:#fff;flex-direction:column;gap:0;padding:16px;box-shadow:-4px 0 20px rgba(0,0,0,.12);transform:translateX(100%);transition:.3s}
  .nav.open{transform:translateX(0)}
  .nav a{width:100%;padding:14px 16px;border-radius:8px}
  .nav a.active::after{display:none}
  .nav a.active{background:var(--blue-light)}
  .nav-toggle{display:flex}
  .nav-toggle.open span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
  .nav-toggle.open span:nth-child(2){opacity:0}
  .nav-toggle.open span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
  .grid-4,.grid-3,.grid-2{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero h1{font-size:30px}
  .hero-inner{padding:64px 24px 72px}
  .section{padding:56px 0}
  .section-head h2{font-size:27px}
  .form-row{grid-template-columns:1fr}
  .cta-inner{flex-direction:column;text-align:center;align-items:center}
  .footer-bottom .container{flex-direction:column;text-align:center}
}