/* ===== 全局变量 ===== */
:root{
  --bg-paper:#F8F7F4;--bg-card:#FFFFFF;
  --primary:#2A4858;--primary-deep:#1F3440;--primary-deeper:#17262E;
  --gold:#B8934A;--gold-light:#E6C87A;
  --ink:#1C1C1C;--ink-2:#5C5C5C;--ink-3:#8FA9B7;
  --border:#E2DFD7;
  --on-dark:#E6EDF2;--on-dark-muted:#A6BCC9;--on-dark-soft:#B8CDD9;--on-dark-text:#DCE5EC;
}

/* ===== 基础重置 ===== */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Noto Sans SC',system-ui,-apple-system,sans-serif;background:var(--bg-paper);color:var(--ink);-webkit-font-smoothing:antialiased;line-height:1.6}
.wrap{width:100%;background:var(--bg-paper)}
.inner{padding-left:80px;padding-right:80px}
a{color:inherit;text-decoration:none;transition:color .2s ease,opacity .2s ease}
a:hover{opacity:.75}
img{display:block;width:100%;height:100%;object-fit:cover}
h1,h2,h3,.serif{font-family:'Noto Serif SC',serif}

/* ===== 顶条 ===== */
.topbar{background:var(--primary);color:var(--on-dark)}
.topbar .inner{display:flex;justify-content:space-between;align-items:center;padding-top:10px;padding-bottom:10px}
.topbar p{font-size:13px}
.topbar nav{display:flex;gap:20px}
.topbar nav a{font-size:13px;color:var(--on-dark)}

/* ===== 主导航 ===== */
.mainnav{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.mainnav .inner{display:flex;justify-content:space-between;align-items:center;padding-top:18px;padding-bottom:18px}
.brand{display:flex;align-items:center;gap:14px}
.brand-logo{height:44px;width:auto;display:block;object-fit:contain}
.brand-divider{width:1px;height:34px;background:var(--border)}
.brand-dept{font-family:'Noto Serif SC',serif;font-weight:700;font-size:19px;color:var(--ink);line-height:1.2}
.brand-mark{width:44px;height:44px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-family:'Noto Serif SC',serif;font-weight:700;font-size:22px;border-radius:2px}
.brand-cn{font-family:'Noto Serif SC',serif;font-weight:700;font-size:20px;line-height:1.2}
.brand-en{font-size:10px;color:var(--ink-2);letter-spacing:.05em;margin-top:2px}
.menu{display:flex;align-items:center;gap:34px;list-style:none}
.menu > li{position:relative}
.menu li.has-sub{padding-bottom:18px;margin-bottom:-18px}
.menu a, .menu .menu-parent{font-size:15px;font-weight:500;color:var(--ink);position:relative;padding:6px 0;display:inline-flex;align-items:center;gap:5px}
.menu .menu-parent{cursor:default}
.menu a::after, .menu .menu-parent::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--gold);transition:width .25s ease}
.menu a:hover{color:var(--primary);opacity:1}
.menu a:hover::after{width:100%}
.menu .caret{font-size:9px;color:var(--ink-2);transition:transform .22s ease,color .22s ease;font-style:normal}
.menu li.has-sub:hover .menu-parent{color:var(--primary)}
.menu li.has-sub:hover .menu-parent::after{width:100%}
.menu li.has-sub:hover .caret{transform:rotate(180deg);color:var(--gold)}
/* 下拉子菜单 */
.sub-menu{
  position:absolute;top:100%;left:50%;transform:translate(-50%,10px);
  min-width:168px;background:#fff;border:1px solid var(--border);border-radius:2px;
  box-shadow:0 14px 32px rgba(31,52,64,.12);list-style:none;padding:8px 0;
  opacity:0;visibility:hidden;transition:opacity .22s ease,transform .22s ease,visibility .22s;z-index:60;
}
.sub-menu::before{content:"";position:absolute;top:-3px;left:0;right:0;height:3px;background:var(--gold)}
.menu li.has-sub:hover .sub-menu{opacity:1;visibility:visible;transform:translate(-50%,0)}
.sub-menu li a{display:flex;padding:11px 22px;font-size:14px;font-weight:400;color:var(--ink-2);white-space:nowrap;transition:all .18s ease}
.sub-menu li a::after{display:none}
.sub-menu li a:hover{background:var(--bg-paper);color:var(--primary);padding-left:28px;opacity:1}
.search-btn{background:var(--primary);color:#fff;border:none;cursor:pointer;font-family:inherit;font-size:13px;font-weight:500;padding:8px 16px;border-radius:2px;display:flex;align-items:center;gap:6px;transition:background .2s ease}
.search-btn:hover{background:var(--primary-deep)}
/* 汉堡菜单按钮（桌面隐藏） */
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px;touch-action:manipulation;-webkit-tap-highlight-color:transparent}
.nav-toggle span{display:block;width:26px;height:2.5px;background:var(--ink);border-radius:1px;transition:all .3s ease}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}

/* ===== 页脚 ===== */
footer{background:var(--primary-deep);color:var(--on-dark)}
.footer-main{display:flex;justify-content:space-between;align-items:flex-start;gap:48px;padding:32px 80px}
.footer-brand .brand-mark{width:48px;height:48px;background:var(--gold);font-size:24px}
.footer-brand .brand-cn{color:#fff;font-size:22px}
.footer-brand .brand-en{color:var(--on-dark-muted)}
.footer-logo-box{background:#fff;padding:6px 12px;border-radius:2px;display:flex;align-items:center}
.footer-logo-box .brand-logo{height:40px}
.footer-brand .brand-dept{color:#fff;font-size:20px}
.footer-desc{font-size:13px;color:var(--on-dark-soft);line-height:1.6;margin-top:14px;max-width:400px}
.footer-contact{margin-top:12px;display:flex;flex-direction:column;gap:6px}
.footer-contact p{font-size:12.5px;color:var(--on-dark-text)}
.footer-qrs{display:flex;gap:28px;align-items:flex-start}
.qr-item{display:flex;flex-direction:column;align-items:center;gap:10px}
.qr-box{width:92px;height:92px;background:#fff;border-radius:2px;padding:6px;display:flex;align-items:center;justify-content:center}
.qr-box img{width:100%;height:100%;object-fit:contain}
.qr-label{font-size:13px;color:var(--on-dark-soft);display:flex;align-items:center;gap:6px}
.qr-label .dot{width:5px;height:5px;background:var(--gold);border-radius:50%}
.footer-bar{background:var(--primary-deeper)}
.footer-bar .inner{display:flex;justify-content:space-between;align-items:center;padding-top:20px;padding-bottom:20px}
.footer-bar p{font-size:12px;color:var(--ink-3)}

/* ===== 动效 ===== */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ===== 响应式 — 公共部分 ===== */
@media (max-width:1100px){
  .inner{padding-left:40px;padding-right:40px}
  .menu{gap:20px}
  .menu a{font-size:14px}
  .footer-main{flex-direction:column;align-items:flex-start;gap:36px;padding:40px 40px}
  .footer-qrs{gap:20px}
}
@media (max-width:720px){
  .inner{padding-left:20px;padding-right:20px}
  .topbar .inner{flex-direction:column;gap:6px;align-items:flex-start}
  /* 汉堡菜单 */
  .mainnav .inner{flex-direction:row;justify-content:space-between;align-items:center;position:relative}
  .nav-toggle{display:flex}
  .search-btn{display:none}
  .menu{
    display:none;flex-direction:column;gap:0;list-style:none;
    position:absolute;top:100%;left:0;right:0;
    background:#fff;border-top:1px solid var(--border);
    box-shadow:0 14px 32px rgba(31,52,64,.12);
    padding:8px 20px 16px;z-index:60;max-height:70vh;overflow-y:auto;
  }
  .mainnav.nav-open .menu{display:flex}
  .menu > li{width:100%;border-bottom:1px solid var(--border)}
  .menu > li:last-child{border-bottom:none}
  .menu li.has-sub{padding-bottom:0;margin-bottom:0}
  .menu a, .menu .menu-parent{
    display:block;padding:14px 0;font-size:15px;width:100%;
  }
  .menu a::after, .menu .menu-parent::after{display:none}
  .menu .caret{margin-left:auto}
  .menu .menu-parent{display:flex;justify-content:space-between;align-items:center;cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent}
  .menu .caret{pointer-events:none}
  .sub-menu{
    position:static;transform:none;opacity:1;visibility:visible;
    box-shadow:none;border:none;border-left:2px solid var(--border);
    margin:0 0 4px 12px;min-width:0;padding:0;display:none;
  }
  .menu li.has-sub.sub-open .sub-menu{display:block}
  .sub-menu::before{display:none}
  .sub-menu li a{padding:10px 14px;font-size:13px}
  /* 页脚 */
  .footer-main{flex-direction:column;align-items:flex-start;gap:28px;padding:32px 20px}
  .footer-qrs{gap:16px;flex-wrap:wrap}
  .qr-box{width:76px;height:76px}
  .footer-bar .inner{flex-direction:column;gap:8px;text-align:center}
}
@media (max-width:420px){
  .footer-qrs{gap:12px}
  .qr-box{width:68px;height:68px}
  .qr-label{font-size:12px}
}