/* =========================================================
   河北萍廊商贸有限公司 · 官网样式
   简约大气 · 商务风 (深蓝 + 金)
========================================================= */
:root{
  --brand:#0f2a43;          /* 深蓝 */
  --brand-dark:#0a1f33;
  --gold:#c9a15c;           /* 金 */
  --gold-dark:#a8843f;
  --text:#333;
  --muted:#7a828d;
  --bg:#ffffff;
  --bg-alt:#f6f8fb;
  --line:#e6eaf0;
  --radius:12px;
  --shadow:0 10px 30px rgba(15,42,67,.08);
  --shadow-lg:0 18px 44px rgba(15,42,67,.14);
  --maxw:1200px;
  --header-h:72px;
}

*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:var(--header-h);}
body{
  font-family:"PingFang SC","Microsoft YaHei",-apple-system,"Helvetica Neue",Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}

/* ---------- 导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--header-h);
  background:rgba(15,42,67,.0);
  color:#fff;
  transition:background .35s ease, box-shadow .35s ease;
}
.site-header.scrolled{
  background:rgba(255,255,255,.97);
  color:var(--brand);
  box-shadow:0 4px 20px rgba(15,42,67,.08);
}
.nav-bar{height:var(--header-h);display:flex;align-items:center;justify-content:space-between;}
.logo{display:flex;align-items:center;gap:12px;}
.logo-mark{
  width:42px;height:42px;border-radius:10px;
  background:var(--gold);color:#fff;font-size:22px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.logo-text{font-size:20px;font-weight:700;letter-spacing:1px;}
.site-header.scrolled .logo-mark{background:var(--brand);}
.nav-links{display:flex;gap:34px;}
.nav-links a{
  font-size:15px;font-weight:500;opacity:.9;
  padding:6px 0;position:relative;transition:.25s;
}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:0;width:0;height:2px;
  background:var(--gold);transition:width .3s;
}
.nav-links a:hover,.nav-links a.active{opacity:1;color:var(--gold);}
.nav-links a:hover::after,.nav-links a.active::after{width:100%;}
.site-header.scrolled .nav-links a::after{background:var(--gold);}
.nav-toggle{
  display:none;background:none;border:none;cursor:pointer;padding:6px;z-index:101;
}
.nav-toggle span{
  display:block;width:24px;height:2px;background:currentColor;margin:5px 0;transition:.3s;
}

/* ---------- 首屏 Hero ---------- */
.hero{
  position:relative;min-height:92vh;
  display:flex;align-items:center;
  background:linear-gradient(135deg,#0a1f33 0%,#16395c 55%,#1d4a75 100%);
  color:#fff;overflow:hidden;
}
.hero-overlay{
  position:absolute;inset:0;opacity:.22;
  background-image:radial-gradient(circle at 80% 20%, #c9a15c88 0, transparent 42%),
                   radial-gradient(circle at 20% 85%, #ffffff22 0, transparent 40%);
}
.hero-content{position:relative;z-index:2;max-width:760px;}
.hero-tag{letter-spacing:4px;color:var(--gold);font-size:13px;font-weight:600;margin-bottom:18px;}
.hero-title{font-size:54px;font-weight:800;line-height:1.2;letter-spacing:2px;margin-bottom:16px;}
.hero-sub{font-size:24px;font-weight:500;color:#e9eef5;margin-bottom:18px;}
.hero-desc{font-size:16px;color:#c3d0e0;max-width:600px;margin-bottom:38px;}
.hero-actions{display:flex;gap:18px;flex-wrap:wrap;}
.btn{
  display:inline-block;padding:14px 34px;border-radius:8px;font-size:16px;font-weight:600;
  cursor:pointer;transition:.3s;border:2px solid transparent;
}
.btn-primary{background:var(--gold);color:#fff;}
.btn-primary:hover{background:var(--gold-dark);transform:translateY(-2px);box-shadow:var(--shadow);}
.btn-ghost{border-color:#ffffff88;color:#fff;}
.btn-ghost:hover{border-color:#fff;background:#ffffff22;}

/* ---------- 通用章节 ---------- */
.section{padding:96px 0;}
.section-alt{background:var(--bg-alt);}
.section-head{text-align:center;margin-bottom:56px;}
.section-eyebrow{color:var(--gold);letter-spacing:3px;font-size:13px;font-weight:600;margin-bottom:10px;}
.section-title{font-size:36px;font-weight:800;color:var(--brand);letter-spacing:1px;}
.section-line{width:52px;height:3px;background:var(--gold);margin:18px auto 0;border-radius:3px;}

/* ---------- 关于我们 ---------- */
.about-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:52px;align-items:center;}
.about-text p{font-size:16px;color:#555;margin-bottom:18px;}
.about-points{list-style:none;margin-top:18px;}
.about-points li{font-size:15px;color:#444;padding:10px 0 10px 26px;position:relative;border-bottom:1px dashed var(--line);}
.about-points li:last-child{border-bottom:none;}
.about-points li::before{content:"◆";color:var(--gold);position:absolute;left:0;top:10px;font-size:12px;}
.about-points strong{color:var(--brand);}
.about-stats{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.stat-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 20px;text-align:center;box-shadow:var(--shadow);transition:.3s;
}
.stat-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);}
.stat-num{font-size:38px;font-weight:800;color:var(--gold);display:block;line-height:1.1;}
.stat-label{font-size:14px;color:var(--muted);margin-top:8px;display:block;}

/* ---------- 业务范围 ---------- */
.biz-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.biz-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:36px 28px;text-align:center;transition:.3s;box-shadow:var(--shadow);
}
.biz-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--gold);}
.biz-icon{font-size:46px;margin-bottom:18px;}
.biz-card h3{font-size:20px;color:var(--brand);margin-bottom:12px;font-weight:700;}
.biz-card p{font-size:14px;color:var(--muted);}

/* ---------- 产品展示 ---------- */
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;}
.product-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;text-align:center;transition:.3s;box-shadow:var(--shadow);overflow:hidden;
}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);}
.product-thumb{
  width:100%;aspect-ratio:1/1;border-radius:10px;
  display:flex;align-items:center;justify-content:center;font-size:58px;margin-bottom:18px;
}
.product-card h3{font-size:18px;color:var(--brand);margin-bottom:8px;}
.product-card p{font-size:13px;color:var(--muted);}

/* ---------- 新闻 ---------- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.news-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;transition:.3s;box-shadow:var(--shadow);
}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);}
.news-date{color:var(--gold);font-size:13px;font-weight:600;display:block;margin-bottom:10px;}
.news-card h3{font-size:17px;color:var(--brand);margin-bottom:10px;line-height:1.4;}
.news-card p{font-size:14px;color:var(--muted);}

/* ---------- 联系我们 ---------- */
.contact-wrap{display:grid;grid-template-columns:1fr 1fr;gap:48px;}
.contact-info h3{font-size:24px;color:var(--brand);margin-bottom:22px;}
.contact-info ul{list-style:none;}
.contact-info li{font-size:16px;color:#555;padding:12px 0;border-bottom:1px dashed var(--line);}
.contact-info li span{color:var(--brand);font-weight:600;margin-right:8px;}
.contact-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow);}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.contact-form input,.contact-form textarea{
  width:100%;padding:13px 16px;border:1px solid var(--line);border-radius:8px;
  font-size:15px;font-family:inherit;margin-bottom:16px;color:var(--text);background:#fbfcfe;transition:.2s;
}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--gold);background:#fff;box-shadow:0 0 0 3px rgba(201,161,92,.12);}
.contact-form textarea{resize:vertical;}
.form-tip{margin-top:14px;font-size:14px;color:var(--gold);min-height:20px;}
.form-tip.ok{color:#2f9e5f;}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--brand-dark);color:#c3d0e0;padding:64px 0 0;}
.footer-inner{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding-bottom:40px;}
.footer-logo .logo-mark{background:var(--gold);color:#0a1f33;}
.footer-brand p{margin-top:16px;font-size:14px;color:#93a4b8;}
.footer-links,.footer-contact h4{font-size:15px;color:#fff;margin-bottom:16px;font-weight:600;}
.footer-links a{display:block;font-size:14px;padding:6px 0;color:#93a4b8;transition:.2s;}
.footer-links a:hover{color:var(--gold);}
.footer-contact p{font-size:14px;color:#93a4b8;padding:6px 0;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:22px 0;text-align:center;font-size:13px;color:#7e93aa;}

/* ---------- 响应式 ---------- */
@media(max-width:992px){
  .biz-grid{grid-template-columns:repeat(2,1fr);}
  .product-grid{grid-template-columns:repeat(2,1fr);}
  .news-grid{grid-template-columns:1fr;}
  .about-grid,.contact-wrap{grid-template-columns:1fr;}
}
@media(max-width:768px){
  .nav-toggle{display:block;color:#fff;}
  .site-header.scrolled .nav-toggle{color:var(--brand);}
  .nav-links{
    position:fixed;top:0;right:-100%;height:100vh;width:78%;max-width:320px;
    background:var(--brand);flex-direction:column;gap:0;padding:90px 30px;transition:.35s;
    box-shadow:-10px 0 30px rgba(0,0,0,.2);
  }
  .nav-links.open{right:0;}
  .nav-links a{padding:16px 0;border-bottom:1px solid rgba(255,255,255,.08);font-size:17px;color:#fff;}
  .hero-title{font-size:34px;}
  .hero-sub{font-size:19px;}
  .section{padding:64px 0;}
  .section-title{font-size:28px;}
  .footer-inner{grid-template-columns:1fr;}
  .form-row{grid-template-columns:1fr;}
}