/* ============================================================
   多睿生科 Dura Life Sciences · 全站共享 header/footer 样式
   供所有前台页面（首页 + 内页）使用，无全局 reset，不破坏内页 Bootstrap
   ============================================================ */
:root{
  --blue:#2563EB;
  --blue-deep:#1D4ED8;
  --green:#10B981;
  --green-deep:#059669;
  --teal:#00B8A9;
  --yellow:#FFC53D;
  --yellow-deep:#F5B400;
  --yellow-soft:#FFF6DC;
  --ink:#0E2438;
  --muted:#5E6E80;
  --bg:#F4F9F8;
  --card:#FFFFFF;
  --line:#E3EDEF;
  --grad:linear-gradient(120deg,#2563EB 0%,#00B8A9 55%,#10B981 100%);
  --grad-soft:linear-gradient(120deg,#EFF6FF,#ECFDF5);
  --radius:18px;
  --shadow:0 8px 28px rgba(14,36,56,.08);
  --shadow-lg:0 22px 50px rgba(14,36,56,.14);
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans CN","Noto Sans CJK SC",Helvetica,Arial,sans-serif;
}
.d-container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== 顶部提示条 ===== */
.d-topbar{background:var(--blue-deep);color:#d7e6ff;font-size:12.5px;padding:8px 0}
.d-topbar .d-container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:6px}
.d-topbar b{color:#ffe08a;font-weight:600}
.d-topbar a{color:#d7e6ff;margin-left:14px}
.d-topbar a:hover{color:#fff}

/* ===== 导航 ===== */
.d-nav{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.92);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.d-nav-inner{display:flex;align-items:center;gap:22px;height:82px}
.d-logo{display:flex;align-items:center;gap:12px;text-decoration:none;flex-shrink:0}
.d-logo-img{max-height:60px;width:auto;display:block}
.d-footer .d-logo{background:#fff;padding:8px 12px;border-radius:10px}
.d-nav-menu{display:flex;gap:2px;margin-left:auto;align-items:center;list-style:none;margin:0;padding:0;flex-shrink:1;min-width:0}
.d-nav-menu > a,.d-nav-item > a{display:inline-flex;align-items:center;gap:4px;padding:8px 11px;border-radius:10px;font-size:14px;color:#3a4b5c;font-weight:500;transition:.2s;text-decoration:none;white-space:nowrap;flex-shrink:0}
.d-nav-menu > a:hover,.d-nav-item > a:hover{color:var(--blue);background:var(--grad-soft)}
.d-nav-menu > a.active{color:var(--blue);background:var(--grad-soft);font-weight:600}
.d-nav-item{position:relative}
.d-nav-arrow{font-size:10px;opacity:.6;transition:.2s}
.d-nav-item:hover .d-nav-arrow{transform:rotate(180deg)}
.d-megamenu{position:absolute;top:100%;left:50%;min-width:640px;max-width:920px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-lg);padding:22px;opacity:0;visibility:hidden;transform:translateX(-50%) translateY(10px);transition:opacity .22s,transform .22s,visibility .22s;z-index:100;display:grid;grid-template-columns:repeat(4,1fr);gap:18px 22px}
.d-nav-item:hover .d-megamenu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(4px)}
.d-mm-title{font-size:15px;font-weight:700;margin:0 0 10px}
.d-mm-title a{color:var(--ink);transition:.15s;text-decoration:none}
.d-mm-title a:hover{color:var(--blue)}
.d-mm-list{list-style:none;margin:0;padding:0}
.d-mm-list li{margin-bottom:7px}
.d-mm-list a{font-size:13px;color:var(--muted);transition:.15s;text-decoration:none}
.d-mm-list a:hover{color:var(--blue)}
.d-dropdown{position:absolute;top:100%;left:50%;min-width:200px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-lg);padding:10px;opacity:0;visibility:hidden;transform:translateX(-50%) translateY(10px);transition:opacity .22s,transform .22s,visibility .22s;z-index:100}
.d-nav-item:hover .d-dropdown{opacity:1;visibility:visible;transform:translateX(-50%) translateY(4px)}
.d-dropdown a{display:block;padding:10px 16px;border-radius:9px;font-size:14px;color:#3a4b5c;font-weight:500;transition:.15s;white-space:nowrap;text-decoration:none}
.d-dropdown a:hover{background:var(--grad-soft);color:var(--blue)}
.d-nav-search{display:flex;align-items:center;background:#fff;border:1.5px solid var(--line);border-radius:12px;padding:0 6px 0 14px;transition:.2s;width:210px;flex-shrink:1;min-width:160px}
.d-nav-search:focus-within{border-color:var(--green);box-shadow:0 0 0 4px rgba(16,185,129,.12)}
.d-nav-search input{border:0;outline:0;height:40px;font-size:14px;flex:1;min-width:0;background:transparent;font-family:var(--font)}
.d-nav-search button{border:0;background:var(--grad);color:#fff;width:38px;height:34px;border-radius:9px;cursor:pointer;font-size:14px}
.d-nav-cta{margin-left:4px;background:var(--yellow);color:#4a3a00;padding:10px 20px;border-radius:12px;font-size:14px;font-weight:700;transition:.2s;white-space:nowrap;box-shadow:0 6px 16px rgba(255,197,61,.35);text-decoration:none}
.d-nav-cta:hover{background:var(--yellow-deep);transform:translateY(-1px)}
.d-hamburger{display:none;font-size:22px;color:var(--ink);cursor:pointer}

/* ===== 页脚 ===== */
.d-footer{background:#0B1F38;color:#b9cce0;padding:64px 0 0}
.d-footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:46px}
.d-footer h4{color:#fff;font-size:16px;font-weight:700;margin-bottom:18px}
.d-footer p{font-size:13.5px;line-height:1.9}
.d-footer ul{list-style:none;margin:0;padding:0}
.d-footer ul li{margin-bottom:11px}
.d-footer ul li a{font-size:13.5px;color:#b9cce0;transition:.2s;text-decoration:none}
.d-footer ul li a:hover{color:#6ee7b7}
.d-footer .contact li{display:flex;gap:10px;align-items:flex-start;font-size:13.5px;margin-bottom:14px}
.d-footer .contact i{color:#6ee7b7;margin-top:4px}
.d-footer-social{display:flex;gap:12px;margin-top:18px}
.d-footer-social a{width:38px;height:38px;border-radius:11px;background:rgba(255,255,255,.08);display:flex;align-items:center;justify-content:center;color:#cfe0f5;transition:.2s;text-decoration:none}
.d-footer-social a:hover{background:var(--grad);color:#fff;transform:translateY(-3px)}
.d-footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;font-size:13px;color:#7d94b0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
.d-footer-bottom a{color:#7d94b0;text-decoration:none}

/* ===== 返回顶部按钮 ===== */
.d-backtop{position:fixed;right:28px;bottom:28px;width:46px;height:46px;border-radius:12px;background:var(--grad);color:#fff;border:0;cursor:pointer;font-size:18px;box-shadow:0 10px 26px rgba(37,99,235,.4);opacity:0;visibility:hidden;transform:translateY(12px);transition:.3s;z-index:200}
.d-backtop.show{opacity:1;visibility:visible;transform:translateY(0)}
.d-backtop:hover{filter:brightness(1.08)}

@media(max-width:1024px){
  .d-footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .d-nav-menu,.d-nav-search,.d-nav-cta{display:none}
  .d-hamburger{display:block;margin-left:auto}
  .d-footer-grid{grid-template-columns:1fr}
}