:root{--ink:#1e1e1e;--muted:#6a6a6a;--line:#1e1e1e;--soft:#f2efe8;--paper:#f7f4ec;--blue:#3d4f63;--amber:#b5522a;--max:1220px}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Palatino Linotype","Songti SC","SimSun",Georgia,serif;color:var(--ink);background:var(--paper);line-height:1.68}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.container{width:min(var(--max),calc(100% - 36px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:100;background:var(--paper);border-bottom:1px solid var(--ink)}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:14px;min-height:70px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:900}
.brand-mark{width:36px;height:36px;border:1px solid var(--ink);border-radius:50%;display:grid;place-items:center;font-size:10px;font-weight:900}
.nav{display:flex;align-items:center;gap:16px;font-size:13px;font-weight:700;color:var(--muted);flex-wrap:wrap;font-family:-apple-system,"Microsoft YaHei",sans-serif}
.nav a:hover,.nav-item:hover>a{color:var(--ink)}
.nav-item{position:relative;padding:22px 0}
.dropdown{position:absolute;top:64px;left:50%;min-width:250px;padding:10px;border:1px solid var(--ink);background:#fff;opacity:0;visibility:hidden;display:grid;gap:4px;transform:translateX(-50%)}
.nav-item:hover .dropdown{opacity:1;visibility:visible}
.dropdown a{padding:8px 10px;font-size:13px}
.dropdown a:hover{background:var(--soft)}
.header-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-family:-apple-system,"Microsoft YaHei",sans-serif}
.contact{font-size:12px;color:var(--muted)}
.language{font-size:12px;padding:6px 10px;border:1px solid var(--ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 18px;border:1px solid var(--ink);font-weight:800;font-size:14px;cursor:pointer;font-family:-apple-system,"Microsoft YaHei",sans-serif;background:#fff}
.btn-blue{background:var(--blue);color:#fff;border-color:var(--blue)}
.btn-amber{background:var(--amber);color:#fff;border-color:var(--amber)}
.btn-ghost{background:transparent}
section{padding:52px 0;scroll-margin-top:74px}
.section-label{display:inline-block;margin-bottom:8px;font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;font-family:-apple-system,"Microsoft YaHei",sans-serif}
.section-head h2{font-size:clamp(26px,3.6vw,40px);line-height:1.18;margin-bottom:10px}
.section-head p{color:var(--muted);max-width:640px}
.footer{padding:52px 0 22px;border-top:1px solid var(--ink);margin-top:8px;font-family:-apple-system,"Microsoft YaHei",sans-serif}
.footer-grid{display:grid;grid-template-columns:1.2fr .8fr .8fr .9fr;gap:24px}
.footer h3,.footer h4{margin-bottom:12px;font-size:16px;font-family:Georgia,serif}
.footer p,.footer a,.footer li{color:var(--muted);font-size:14px}
.footer ul{list-style:none;display:grid;gap:8px}
.subscribe{display:flex;gap:8px;margin-top:12px}
.subscribe input{flex:1;min-height:40px;border:1px solid var(--ink);padding:0 14px;outline:none;background:transparent}
.copyright{display:flex;justify-content:space-between;gap:16px;margin-top:28px;padding-top:16px;border-top:1px solid var(--ink);font-size:13px;color:var(--muted);flex-wrap:wrap}
details.faq{border:1px solid var(--ink);background:transparent;margin-bottom:8px}
details.faq summary{padding:14px 16px;font-weight:800;cursor:pointer;list-style:none;font-family:-apple-system,"Microsoft YaHei",sans-serif}
details.faq summary::-webkit-details-marker{display:none}
details.faq p{padding:0 16px 14px;color:var(--muted);font-size:14px}
@media(max-width:980px){.nav,.contact{display:none}.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:720px){.container{width:min(100% - 24px,var(--max))}.footer-grid{grid-template-columns:1fr}.copyright{flex-direction:column}}
img[data-src]{min-height:120px;background:rgba(128,128,128,.08)}
.below-fold{content-visibility:auto;contain-intrinsic-size:auto 480px}