/* 河北稳固紧固件 - 外贸B2B PC端样式（现代高级感版）
   主题色：#1890FF（拂晓蓝），辅助 #1677cc，强调 #ff8f3c */

* { margin:0; padding:0; box-sizing:border-box; }
:root {
  --primary:#1890FF;
  --primary-deep:#1677cc;
  --primary-light:#46a6ff;
  --ink:#1b3a5c;
  --muted:#5b7a96;
  --bg:#eef5ff;
  --line:#dcedff;
  --card:#ffffff;
  --accent:#ff8f3c;
  --radius:18px;
  --shadow-sm:0 4px 16px rgba(22,119,204,.08);
  --shadow-md:0 12px 32px rgba(22,119,204,.14);
  --shadow-lg:0 22px 50px rgba(18,80,150,.22);
  --grad-blue:linear-gradient(135deg,#1677cc 0%,#1890FF 48%,#46a6ff 100%);
}
html { scroll-behavior:smooth; }
body {
  font-family:"Segoe UI","Microsoft YaHei",Arial,sans-serif;
  color:var(--ink);
  background:
    radial-gradient(1200px 600px at 90% -10%, rgba(70,166,255,.14), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(24,144,255,.10), transparent 55%),
    var(--bg);
  font-size:15px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a { color:var(--primary-deep); text-decoration:none; }
img { max-width:100%; display:block; }
.container { max-width:1180px; margin:0 auto; padding:0 20px; }

/* 顶部条 */
.topbar {
  background:linear-gradient(90deg,#0f4c8a,#1677cc);
  color:#eaf4ff; font-size:13px;
}
.topbar a { color:#eaf4ff; }
.topbar-inner { display:flex; gap:28px; padding:8px 20px; flex-wrap:wrap; align-items:center; }
.tb-item { display:inline-flex; align-items:center; gap:6px; }
.lang-select {
  background:rgba(255,255,255,.14);
  color:#fff; border:1px solid rgba(255,255,255,.4);
  border-radius:8px; padding:4px 10px; font-size:12px; font-family:inherit;
  cursor:pointer; outline:none; backdrop-filter:blur(6px);
}
.lang-select option { color:#1b3a5c; }

/* 头部 */
.site-header {
  background:rgba(255,255,255,.86);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(220,237,255,.7);
  position:sticky; top:0; z-index:60; box-shadow:0 2px 18px rgba(22,119,204,.10);
}
.header-inner { display:flex; align-items:center; justify-content:space-between; height:72px; }
.brand { display:flex; align-items:center; gap:12px; }
.brand-mark {
  width:44px; height:44px; border-radius:12px;
  background:var(--grad-blue); color:#fff; font-weight:800; font-size:24px;
  display:flex; align-items:center; justify-content:center;
  box-shadow:0 6px 16px rgba(24,144,255,.35);
}
.brand-text { display:flex; flex-direction:column; line-height:1.2; }
.brand-text strong { font-size:19px; color:var(--primary-deep); letter-spacing:.5px; }
.brand-text small { font-size:11.5px; color:var(--muted); }
.main-nav { display:flex; align-items:center; gap:4px; }
.nav-link {
  padding:9px 16px; color:#33576f; font-weight:500; border-radius:10px;
  transition:all .2s;
}
.nav-link:hover, .nav-link.active { color:var(--primary-deep); background:rgba(70,166,255,.12); }

.btn {
  display:inline-flex; align-items:center; justify-content:center;
  padding:12px 26px; border-radius:12px; font-weight:600; border:none; cursor:pointer;
  transition:all .22s;
}
.btn-primary {
  background:var(--grad-blue); color:#fff;
  box-shadow:0 8px 22px rgba(24,144,255,.32);
}
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 14px 30px rgba(24,144,255,.42); }
.btn-outline { background:rgba(255,255,255,.6); color:var(--primary-deep); border:1.5px solid var(--primary); }
.btn-outline:hover { background:rgba(70,166,255,.1); }
.btn-nav { padding:9px 20px; margin-left:8px; }
.nav-toggle { display:none; background:rgba(70,166,255,.12); border:none; font-size:22px; color:var(--primary-deep); padding:6px 12px; border-radius:10px; cursor:pointer; }

/* Hero */
.hero {
  background:var(--grad-blue);
  color:#fff; padding:76px 0 96px; position:relative; overflow:hidden;
}
.hero::after {
  content:''; position:absolute; right:-70px; bottom:-90px; width:420px; height:420px;
  border-radius:50%; background:radial-gradient(circle, rgba(255,255,255,.16), rgba(255,255,255,.02));
}
.hero::before {
  content:''; position:absolute; left:-50px; top:-70px; width:300px; height:300px;
  border-radius:50%; background:radial-gradient(circle, rgba(255,255,255,.13), rgba(255,255,255,.02));
}
.hero::after, .hero::before { filter:blur(2px); }
.hero-inner { display:grid; grid-template-columns:1.1fr .9fr; gap:40px; align-items:center; position:relative; z-index:1; }
.hero h1 { font-size:39px; line-height:1.24; font-weight:800; margin-bottom:16px; letter-spacing:-.3px; }
.hero h1 .accent { color:#ffd166; }
.hero p.lead { font-size:17px; color:#eaf4ff; margin-bottom:26px; max-width:540px; }
.hero-btns { display:flex; gap:14px; flex-wrap:wrap; }
.hero .btn-outline {
  color:#fff; border-color:rgba(255,255,255,.7);
  background:rgba(255,255,255,.12); backdrop-filter:blur(6px);
}
.hero .btn-outline:hover { background:rgba(255,255,255,.2); }
.hero-trust { display:flex; gap:28px; margin-top:32px; flex-wrap:wrap; }
.hero-trust .t { font-size:14px; color:#eaf4ff; }
.hero-trust .t b { display:block; font-size:23px; color:#fff; font-weight:800; }
.hero-visual {
  background:rgba(255,255,255,.14);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,.3);
  border-radius:var(--radius); padding:14px;
  box-shadow:0 24px 55px rgba(10,50,100,.32);
}
.hero-visual img { border-radius:12px; height:290px; object-fit:cover; width:100%; }

/* 通用区块 */
.section { padding:68px 0; }
.section-head { text-align:center; margin-bottom:44px; }
.section-head .kicker {
  display:inline-block; color:var(--primary); font-weight:700;
  letter-spacing:2px; text-transform:uppercase; font-size:13px;
  background:rgba(24,144,255,.1); padding:4px 14px; border-radius:20px;
}
.section-head h2 { font-size:32px; font-weight:800; color:var(--ink); margin:12px 0 12px; letter-spacing:-.3px; }
.section-head p { color:var(--muted); max-width:660px; margin:0 auto; }

/* 优势 */
.adv-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:24px; }
.adv-card {
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:30px 24px; transition:all .25s;
  box-shadow:var(--shadow-sm);
}
.adv-card:hover {
  transform:translateY(-6px); box-shadow:var(--shadow-lg);
  border-color:transparent;
  background:
    linear-gradient(var(--card), var(--card)) padding-box,
    var(--grad-blue) border-box;
}
.adv-card .ic {
  width:56px; height:56px; border-radius:14px;
  background:linear-gradient(135deg,#eaf5ff,#d6edff); color:var(--primary-deep);
  font-size:28px; display:flex; align-items:center; justify-content:center; margin-bottom:16px;
  box-shadow:inset 0 0 0 1px rgba(24,144,255,.12);
}
.adv-card h3 { font-size:17px; margin-bottom:8px; }
.adv-card p { color:var(--muted); font-size:14px; }

/* 产品分类 */
.prod-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:26px; }
/* 额外产品列表不占网格格子，让内部卡片直接参与 3 列排列 */
#extra-list { display:contents; }
.prod-card {
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  overflow:hidden; transition:all .25s; display:flex; flex-direction:column;
  box-shadow:var(--shadow-sm);
}
.prod-card:hover { transform:translateY(-8px); box-shadow:var(--shadow-lg); }
.prod-card img { height:210px; width:100%; object-fit:cover; transition:transform .4s; }
.prod-card:hover img { transform:scale(1.05); }
.prod-card .body { padding:24px; display:flex; flex-direction:column; flex:1; }
.prod-card h3 { font-size:20px; margin-bottom:8px; }
.prod-card .std { color:var(--primary-deep); font-size:13px; font-weight:600; margin-bottom:8px; }
.prod-card p { color:var(--muted); font-size:14px; flex:1; }
.prod-card .link { margin-top:16px; font-weight:600; color:var(--primary); }

/* 工厂实力 */
.factory-grid { display:grid; grid-template-columns:1fr 1fr; gap:44px; align-items:center; }
.factory-stats { display:grid; grid-template-columns:repeat(2,1fr); gap:20px; margin-top:22px; }
.stat-box {
  background:linear-gradient(135deg,#fff,#f3f9ff);
  border:1px solid var(--line); border-left:4px solid var(--primary);
  border-radius:14px; padding:18px; box-shadow:var(--shadow-sm);
  transition:transform .2s;
}
.stat-box:hover { transform:translateY(-3px); }
.stat-box .num { font-size:28px; font-weight:800; color:var(--primary-deep); line-height:1.2; }
.stat-box .lbl { color:var(--muted); font-size:13px; }
.factory-img img { border-radius:var(--radius); height:340px; object-fit:cover; width:100%; box-shadow:var(--shadow-md); }

/* 行业卡片（动态图标） */
.ind-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:22px; }
.ind-card {
  background:#fff; border:1px solid var(--line); border-radius:18px;
  padding:28px 22px 24px; text-align:center; position:relative; overflow:hidden;
  box-shadow:var(--shadow-sm); transition:transform .25s, box-shadow .25s, border-color .25s;
}
.ind-card::before {
  content:''; position:absolute; top:0; left:0; right:0; height:4px;
  background:var(--grad-blue); opacity:0; transition:opacity .25s;
}
.ind-card:hover { transform:translateY(-6px); box-shadow:var(--shadow-lg); border-color:transparent; }
.ind-card:hover::before { opacity:1; }
.ind-ic {
  width:64px; height:64px; margin:0 auto 14px; font-size:34px; line-height:1;
  display:flex; align-items:center; justify-content:center;
  background:linear-gradient(135deg,#eaf5ff,#d6edff); border-radius:18px;
  box-shadow:inset 0 0 0 1px rgba(24,144,255,.14);
  animation:indFloat 3.2s ease-in-out infinite;
}
.ind-card:nth-child(2n) .ind-ic { animation-delay:.5s; }
.ind-card:nth-child(3n) .ind-ic { animation-delay:1s; }
.ind-card:nth-child(4n) .ind-ic { animation-delay:1.5s; }
.ind-card:hover .ind-ic { animation-play-state:paused; transform:scale(1.12); }
@keyframes indFloat { 0%,100% { transform:translateY(0); } 50% { transform:translateY(-7px); } }
.ind-card h3 { font-size:16px; margin-bottom:6px; color:var(--ink); }
.ind-card p { font-size:13px; color:var(--muted); margin:0; line-height:1.6; }

/* 信任/合作 */
.partner-strip { display:flex; gap:18px; flex-wrap:wrap; justify-content:center; }
.partner-tag {
  background:linear-gradient(135deg,#fff,#f3f9ff);
  border:1px solid var(--line); padding:13px 26px; border-radius:30px;
  color:#33576f; font-weight:600; box-shadow:var(--shadow-sm);
  transition:all .2s;
}
.partner-tag:hover { transform:translateY(-3px); box-shadow:var(--shadow-md); border-color:var(--primary-light); }

/* 项目展示墙 */
.proj-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.proj-card {
  background:#fff; border:1px solid var(--line); border-radius:var(--radius);
  padding:24px; box-shadow:var(--shadow-sm); transition:all .22s;
  display:flex; flex-direction:column;
}
.proj-card:hover { transform:translateY(-4px); box-shadow:var(--shadow-md); }
.proj-card .pc-tag {
  display:inline-block; align-self:flex-start;
  font-size:12px; font-weight:600; padding:3px 12px; border-radius:12px;
  background:rgba(24,144,255,.1); color:var(--primary-deep); margin-bottom:12px;
}
.proj-card h4 { font-size:15px; margin-bottom:8px; color:var(--ink); line-height:1.5; }
.proj-card .pc-meta { font-size:13px; color:var(--muted); margin-top:auto; }

/* 微博式动态流 */
.feed { max-width:720px; margin:0 auto; }
.feed-item {
  background:#fff; border:1px solid var(--line); border-radius:var(--radius);
  padding:24px; margin-bottom:20px; box-shadow:var(--shadow-sm);
}
.feed-item .f-meta { display:flex; align-items:center; gap:10px; font-size:13px; color:var(--muted); margin-bottom:12px; }
.feed-item .f-dot { width:8px; height:8px; border-radius:50%; background:var(--primary); }
.feed-item .f-content { font-size:15px; white-space:pre-wrap; margin-bottom:14px; }
.feed-item img, .feed-item video { max-width:100%; border-radius:12px; margin-bottom:6px; }
/* 微博式九宫格图片 */
.feed-imgs { display:grid; grid-template-columns:repeat(3,1fr); gap:4px; margin:10px 0 4px; }
.feed-imgs img { width:100%; height:100%; aspect-ratio:1; object-fit:cover; border-radius:8px; margin:0; }
.feed-imgs.n1 { grid-template-columns:1fr; }
.feed-imgs.n1 img { aspect-ratio:auto; max-height:420px; object-fit:contain; background:#f6f9fc; border-radius:12px; }
.feed-imgs.n2 { grid-template-columns:repeat(2,1fr); }
.feed-imgs.n4 { grid-template-columns:repeat(2,1fr); }
.feed-empty { text-align:center; padding:60px 20px; color:var(--muted); }

/* 动态评论 */
.cmt-notice { max-width:720px; margin:0 auto 16px; padding:10px 16px; border-radius:10px; font-size:13px; }
.cmt-notice.ok { background:#e7f7ec; color:#1e7d3c; border:1px solid #bfe8cc; }
.cmt-notice.err { background:#ffecec; color:#c0392b; border:1px solid #ffc9c9; }
.cmts { margin-top:16px; border-top:1px solid var(--line); padding-top:14px; }
.cmt-title { font-size:13px; font-weight:600; color:var(--muted); margin-bottom:8px; }
.cmt-item { display:flex; align-items:baseline; gap:10px; padding:7px 0; font-size:14px; border-bottom:1px dashed var(--line); }
.cmt-item:last-of-type { border-bottom:none; }
.cmt-name { font-weight:700; color:var(--primary-deep); flex-shrink:0; min-width:70px; }
.cmt-text { color:var(--ink); flex:1; word-break:break-word; }
.cmt-time { color:#a3b8cc; font-size:12px; flex-shrink:0; }
.cmt-empty { font-size:13px; color:#a3b8cc; padding:2px 0 6px; }
.cmt-form { display:flex; gap:10px; margin-top:12px; }
.cmt-form input[type=text] { padding:9px 12px; border:1px solid #cfe2f5; border-radius:9px; font-size:13px; font-family:inherit; outline:none; background:#fbfdff; color:var(--ink); }
.cmt-form input[name=name] { width:120px; flex-shrink:0; }
.cmt-form .cmt-input { flex:1; }
.cmt-form input[type=text]:focus { border-color:var(--primary); box-shadow:0 0 0 3px rgba(24,144,255,.12); }
.cmt-form button { padding:9px 22px; background:var(--grad-blue); color:#fff; border:none; border-radius:9px; font-weight:600; cursor:pointer; font-size:13px; }
.cmt-form button:hover { opacity:.92; }
@media(max-width:560px) { .cmt-form { flex-wrap:wrap; } .cmt-form input[name=name] { width:100%; } .cmt-item { flex-wrap:wrap; } }

/* CTA */
.cta-box {
  background:var(--grad-blue); border-radius:22px; padding:52px; color:#fff; text-align:center;
  box-shadow:var(--shadow-lg); position:relative; overflow:hidden;
}
.cta-box::before {
  content:''; position:absolute; right:-40px; top:-50px; width:220px; height:220px;
  border-radius:50%; background:rgba(255,255,255,.12);
}
.cta-box h2 { font-size:30px; margin-bottom:14px; position:relative; }
.cta-box p { color:#eaf4ff; margin-bottom:26px; position:relative; }

/* Footer */
.site-footer {
  background:linear-gradient(160deg,#0a2a4a,#123a63);
  color:#cfe4f7; margin-top:20px;
}
.footer-grid { display:grid; grid-template-columns:1.4fr 1fr 1fr 1.2fr; gap:36px; padding:52px 20px; }
.f-col h4 { color:#fff; font-size:16px; margin-bottom:16px; }
.f-col a { display:block; color:#cfe4f7; padding:5px 0; font-size:14px; transition:.15s; }
.f-col a:hover { color:#fff; padding-left:4px; }
.f-col p { font-size:14px; margin-bottom:6px; }
.footer-bottom { border-top:1px solid rgba(255,255,255,.12); padding:16px 0; text-align:center; font-size:13px; color:#9fc2df; }

/* WhatsApp 悬浮 */
.wa-float {
  position:fixed; right:22px; bottom:26px; width:58px; height:58px; border-radius:50%;
  background:#25d366; color:#fff; font-size:30px;
  display:flex; align-items:center; justify-content:center;
  box-shadow:0 10px 26px rgba(37,211,102,.45); z-index:70; transition:.22s;
}
.wa-float:hover { transform:scale(1.1); box-shadow:0 14px 34px rgba(37,211,102,.55); }

/* 面包屑/内页 */
.page-head {
  background:
    radial-gradient(500px 200px at 20% 0%, rgba(255,255,255,.12), transparent),
    var(--grad-blue);
  color:#fff; padding:50px 0;
}
.page-head h1 { font-size:32px; font-weight:800; }
.page-head .crumb { color:#cfe4f7; font-size:14px; margin-top:6px; }
.page-head .crumb a { color:#fff; }

/* 产品详情 */
.pdp-grid { display:grid; grid-template-columns:1fr 1.2fr; gap:44px; align-items:start; }
.pdp-img { position:sticky; top:92px; }
.pdp-img img {
  border-radius:var(--radius); border:1px solid var(--line);
  box-shadow:var(--shadow-md);
}
.spec-table {
  width:100%; border-collapse:collapse; background:#fff;
  border:1px solid var(--line); border-radius:14px; overflow:hidden;
  box-shadow:var(--shadow-sm);
}
.spec-table th, .spec-table td { padding:14px 18px; border-bottom:1px solid var(--line); text-align:left; font-size:14px; }
.spec-table th { background:linear-gradient(135deg,#eef7ff,#e3f2ff); color:var(--primary-deep); width:180px; font-weight:600; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom:none; }
.feat-list { list-style:none; }
.feat-list li { padding:9px 0 9px 30px; position:relative; }
.feat-list li::before { content:'✓'; position:absolute; left:0; color:var(--primary); font-weight:700; }

/* RFQ 表单 */
.rfq-wrap { display:grid; grid-template-columns:1.1fr .9fr; gap:44px; align-items:start; }
.rfq-form {
  background:#fff; border:1px solid var(--line); border-radius:20px; padding:32px;
  box-shadow:var(--shadow-md);
}
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.form-group { margin-bottom:16px; }
.form-group label { display:block; font-size:13px; font-weight:600; color:#33576f; margin-bottom:6px; }
.form-group label .req { color:#ff5a5a; }
.form-group input, .form-group select, .form-group textarea {
  width:100%; padding:12px 15px; border:1px solid #cfe2f5; border-radius:11px;
  font-size:14px; font-family:inherit; color:var(--ink); outline:none; transition:.15s;
  background:#fbfdff;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color:var(--primary); box-shadow:0 0 0 4px rgba(24,144,255,.13); background:#fff;
}
.form-msg { display:none; margin-top:14px; padding:12px 16px; border-radius:11px; font-size:14px; }
.form-msg.ok { display:block; background:#e7f7ec; color:#1e7d3c; border:1px solid #bfe8cc; }
.form-msg.err { display:block; background:#ffecec; color:#c0392b; border:1px solid #ffc9c9; }
.rfq-side {
  background:linear-gradient(135deg,#fff,#f3f9ff);
  border:1px solid var(--line); border-radius:20px; padding:28px;
  box-shadow:var(--shadow-sm);
}
.rfq-side h3 { margin-bottom:14px; }
.rfq-side .ci { display:flex; gap:10px; padding:11px 0; border-bottom:1px solid var(--line); font-size:14px; }
.rfq-side .ci:last-child { border-bottom:none; }
.rfq-side .ci b { color:var(--primary-deep); }

/* 响应式 */
@media(max-width:960px) {
  .adv-grid { grid-template-columns:repeat(2,1fr); }
  .prod-grid { grid-template-columns:repeat(3,1fr); }
  .ind-grid { grid-template-columns:repeat(2,1fr); }
  .proj-grid { grid-template-columns:repeat(2,1fr); }
  .factory-grid, .pdp-grid, .rfq-wrap { grid-template-columns:1fr; }
  .hero-inner { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr 1fr; }
  .nav-toggle { display:block; }
  .main-nav { display:none; position:absolute; top:72px; left:0; right:0; background:rgba(255,255,255,.97); flex-direction:column; align-items:stretch; padding:12px 20px; border-bottom:1px solid var(--line); box-shadow:0 12px 28px rgba(0,0,0,.1); }
  .main-nav.open { display:flex; }
  .btn-nav { margin-left:0; }
}
@media(max-width:640px) {
  .prod-grid { grid-template-columns:repeat(2,1fr); }
  .ind-grid { grid-template-columns:repeat(2,1fr); }
  .adv-grid { grid-template-columns:1fr; }
  .proj-grid { grid-template-columns:1fr; }
  .form-row { grid-template-columns:1fr; }
  .factory-stats { grid-template-columns:1fr; }
  .hero h1 { font-size:28px; }
}
@media(max-width:480px) {
  .prod-grid { grid-template-columns:1fr; }
  .ind-grid { grid-template-columns:1fr; }
}