/* ===== 全局变量与基础 ===== */
:root {
  --steel: #1B3A5C;
  --steel-light: #2a4a6e;
  --steel-dark: #0F2A45;
  --amber: #E8833A;
  --amber-light: #F0A060;
  --gold: #F0C75E;
  --bg: #F5F7FA;
  --white: #FFFFFF;
  --dark: #2D3436;
  --text: #4a4a4a;
  --green: #27AE60;
  --light-gray: #E8ECF1;
  --border: #DCE3EB;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Microsoft YaHei','PingFang SC',sans-serif;background:var(--bg);color:var(--dark);line-height:1.7;font-size:15px}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ============ 顶部工具条 ============ */
.topbar{background:var(--steel-dark);color:#fff;font-size:13px;padding:8px 0}
.topbar .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px}
.topbar .contact{display:flex;gap:20px;align-items:center}
.topbar .contact span{display:inline-flex;align-items:center;gap:6px}
.topbar .contact .phone{color:var(--gold);font-weight:bold;font-size:15px}
.topbar .links{display:flex;gap:14px;font-size:12px}
.topbar .links a{color:rgba(255,255,255,0.8);transition:color 0.2s}
.topbar .links a:hover{color:var(--gold)}

/* ============ 主导航 ============ */
.header{background:var(--white);box-shadow:0 2px 10px rgba(0,0,0,0.05);position:sticky;top:0;z-index:100}
.header .container{display:flex;justify-content:space-between;align-items:center;padding:14px 20px}
.logo{display:flex;align-items:center;gap:12px}
.logo-mark{width:48px;height:48px;background:linear-gradient(135deg,var(--steel),var(--steel-light));border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--gold);font-size:22px;font-weight:bold;letter-spacing:-1px}
.logo-text .cn{font-size:20px;font-weight:bold;color:var(--steel);letter-spacing:2px;line-height:1.2}
.logo-text .en{font-size:11px;color:var(--amber);letter-spacing:2px;font-family:'Courier New',monospace}
.nav{display:flex;gap:4px;align-items:center}
.nav a{padding:10px 14px;font-size:15px;color:var(--dark);border-radius:6px;transition:all 0.2s;font-weight:500}
.nav a:hover{color:var(--amber);background:rgba(232,131,58,0.08)}
.nav a.active{color:var(--amber)}
.nav-cta{background:var(--amber);color:#fff !important;padding:8px 18px !important;border-radius:20px}
.nav-cta:hover{background:var(--amber-light) !important;color:#fff !important}

/* ============ 底部 ============ */
.footer{background:var(--steel-dark);color:rgba(255,255,255,0.7);padding:50px 0 20px;font-size:13px}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;margin-bottom:30px}
.footer-grid .brand-info{grid-column:auto}
.footer h4{color:var(--gold);font-size:15px;margin-bottom:14px;font-weight:bold;letter-spacing:1px}
.footer ul{list-style:none;padding:0}
.footer li{padding:4px 0}
.footer li a{color:rgba(255,255,255,0.7);transition:color 0.2s}
.footer li a:hover{color:var(--gold)}
.footer .brand-info .logo-text{color:#fff;font-size:18px;font-weight:bold;letter-spacing:2px;margin-bottom:8px}
.footer .brand-info .slogan{color:var(--gold);font-size:13px;margin-bottom:14px;letter-spacing:1px}
.footer .brand-info p{font-size:12px;line-height:1.7;margin-bottom:6px}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.1);padding-top:18px;text-align:center;font-size:12px;color:rgba(255,255,255,0.5)}
.footer-bottom a{color:rgba(255,255,255,0.5);margin:0 6px}

/* ============ 悬浮按钮 ============ */
.float-btns{position:fixed;right:20px;bottom:30px;z-index:99;display:flex;flex-direction:column;gap:10px}
.float-btn{width:50px;height:50px;border-radius:50%;background:var(--amber);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;box-shadow:0 4px 14px rgba(0,0,0,0.2);cursor:pointer;transition:all 0.2s;border:none;text-decoration:none}
.float-btn:hover{background:var(--amber-light);transform:scale(1.1)}
.float-btn.tel{background:var(--steel)}
.float-btn.tel:hover{background:var(--steel-light)}

/* ===== 老板微信二维码 ===== */
.qr-boss{width:84px;height:84px;border-radius:6px;border:1px solid #e2e8f0;background:#fff;object-fit:cover}
.contact-wechat{margin:14px auto 0;display:flex;align-items:center;justify-content:center;gap:12px;padding:10px 14px;background:#fff;border:1px solid #e2e8f0;border-radius:10px;max-width:340px}
.contact-wechat img{width:78px;height:78px;border-radius:6px;background:#fff}
.contact-wechat .cw-text{display:flex;flex-direction:column}
.contact-wechat .cw-text strong{font-size:15px;color:#1B3A5C}
.contact-wechat .cw-text span{font-size:12px;color:#64748b;margin-top:4px}
.float-pop{position:fixed;right:78px;bottom:150px;background:#fff;border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,.18);padding:14px;text-align:center;display:none;z-index:60}
.float-pop.show{display:block}
.float-pop img{width:160px;height:160px;border-radius:8px}
.float-pop p{margin:8px 0 0;font-size:13px;color:#1B3A5C;font-weight:600}
.float-pop .close{position:absolute;top:6px;right:12px;cursor:pointer;color:#999;font-size:18px;line-height:1}
.float-btn.wechat{background:#07c160}

/* ===== 移动端汉堡菜单 ===== */
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:4px;width:42px;height:42px;padding:11px;background:transparent;border:1px solid var(--border);border-radius:8px;cursor:pointer;flex-shrink:0}
.nav-toggle span{display:block;height:2px;width:100%;background:var(--steel);border-radius:2px;transition:all 0.3s}
.nav-toggle.open span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ===== 头尾响应式 ===== */
@media(max-width:992px){
  .header .container{position:relative}
  .nav-toggle{display:flex}
  .nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;box-shadow:0 12px 24px rgba(0,0,0,0.14);border-top:1px solid var(--border);padding:6px 0;z-index:100}
  .nav.open{display:flex}
  .nav a{padding:13px 20px;border-radius:0;border-bottom:1px solid var(--light-gray)}
  .nav a:last-child{border-bottom:none}
  .nav a.nav-cta{margin:10px 16px;text-align:center;border-bottom:none}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:600px){
  .topbar .links{display:none}
  .footer .fnav{display:none}
  .footer-grid{grid-template-columns:1fr}
}

/* ============ 施工技术工艺输出 ============ */
.tech-output{max-width:820px;margin:0 auto;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:30px 32px}
.tech-output p{font-size:15px;color:var(--text);line-height:1.9}

/* ============ 面包屑 ============ */
.breadcrumb{background:var(--white);padding:12px 0;border-bottom:1px solid var(--light-gray);font-size:13px;color:#888}
.breadcrumb a{color:#888;text-decoration:none}
.breadcrumb a:hover{color:var(--amber)}
.breadcrumb .sep{margin:0 8px;color:#ccc}
.breadcrumb .cur{color:var(--steel);font-weight:600}