/* Navigation extracted from the user-supplied site.css; media queries preserved. */
.site-header{z-index:25;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);box-shadow:0 1px 0 var(--line);background:#fffffff7;position:sticky;top:0}
.header-shell{max-width:1440px;padding-left:64px;padding-right:64px}
@media (max-width:1100px){
.header-shell{padding-left:44px;padding-right:44px}
}
@media (max-width:850px){
.header-shell{padding-left:28px;padding-right:28px}
}
@media (max-width:550px){
.header-shell{padding-left:24px;padding-right:24px}
}
.main-nav{font-size:13px}
.nav-list{flex-wrap:wrap;align-items:center;gap:24px;margin:0;padding:0;list-style:none;display:flex}
.nav-item{list-style:none;position:relative}
.nav-row{align-items:center;gap:5px;display:flex}
.nav-toggle{color:var(--brand);cursor:pointer;background:0 0;border:0;padding:8px 3px}
.nav-toggle span{transition:transform .28s;display:block}
.nav-open>.nav-row .nav-toggle span{transform:rotate(180deg)}
.nav-dropdown{z-index:35;opacity:0;visibility:hidden;pointer-events:none;background:#fff;border:1px solid #e8e8e8;min-width:205px;padding:12px;list-style:none;transition:opacity .25s,transform .3s,visibility .3s;position:absolute;top:100%;left:-20px;transform:translateY(12px);box-shadow:0 14px 35px #0001}
.nav-open>.nav-dropdown,html:not(.navigation-enhanced) .has-children:hover>.nav-dropdown,html:not(.navigation-enhanced) .has-children:focus-within>.nav-dropdown{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0)}
.nav-dropdown .nav-row>a{white-space:nowrap;flex:1;padding:10px 12px;display:block}
.nav-dropdown .nav-item>a{padding:10px 12px;display:block}
.nav-dropdown .nav-item:hover{background:var(--brand-tint)}
.nav-dropdown .nav-dropdown{top:0;left:100%}
.nav-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media (max-width:1100px){
.nav-list{gap:16px}
}
@media (max-width:850px){
.main-nav{width:100%}
.nav-list{gap:18px}
.nav-dropdown{left:0}
}
@media (max-width:550px){
.nav-list{gap:8px 18px}
.main-nav{overflow:visible!important}
.nav-dropdown{min-width:185px;left:0}
.nav-list>.nav-item:nth-last-child(-n+2)>.nav-dropdown{left:auto;right:0}
.nav-dropdown .nav-dropdown{box-shadow:none;min-width:0;display:none;position:relative;left:0}
.nav-dropdown .nav-open>.nav-dropdown,html:not(.navigation-enhanced) .nav-dropdown .has-children:focus-within>.nav-dropdown{display:block}
}
@media (prefers-reduced-motion:reduce){
html:not(.motion-on) .nav-dropdown,html:not(.motion-on) .nav-toggle span{transition:none}
}
.nav-row{gap:2px}
.nav-row>a,.nav-list>.nav-item>a{align-items:center;gap:8px;padding:10px 0;display:inline-flex;position:relative}
.nav-toggle{width:28px;height:28px;color:var(--muted);border-radius:7px;place-items:center;padding:0;transition:background .2s,color .2s;display:grid}
.nav-chevron{transition:transform .28s cubic-bezier(.22,1,.36,1)}
.nav-open>.nav-row .nav-chevron{transform:rotate(180deg)}
.nav-toggle:hover,.nav-open>.nav-row .nav-toggle{background:var(--brand-tint);color:var(--brand)}
.nav-list>.nav-item>.nav-row>a:after,.nav-list>.nav-item>a:after{content:"";background:var(--brand);transform-origin:0;height:2px;transition:transform .25s;position:absolute;bottom:3px;left:0;right:0;transform:scaleX(0)}
.nav-list>.nav-item:hover>.nav-row>a:after,.nav-list>.nav-item:hover>a:after,.nav-list [aria-current=page]:after{transform:scaleX(1)}
.nav-dropdown{border-color:#e5e8ec;border-radius:12px;min-width:190px;max-width:calc(100vw - 48px);padding:8px;transition:opacity .2s,transform .25s,visibility .25s;transform:translateY(8px);box-shadow:0 18px 45px #10203018}
.nav-dropdown>.nav-item>a{border-radius:7px;padding:11px 14px;font-size:13px;transition:background .2s,color .2s,transform .2s;display:block}
.nav-dropdown>.nav-item{border-radius:7px}
.nav-dropdown>.nav-item>a:hover,.nav-dropdown [aria-current=page]{background:var(--brand-tint);color:var(--brand);transform:translate(2px)}
/* 下拉首项：栏目首页入口，与子栏目之间留一条分隔线（2026-10-19） */
.nav-dropdown>.nav-item-overview>a{display:flex;align-items:center;justify-content:space-between;gap:14px;font-weight:600;color:var(--brand);border-bottom:1px solid #eef1f4;border-radius:7px 7px 0 0;padding-bottom:12px;margin-bottom:4px}
.nav-dropdown>.nav-item-overview>a:hover{transform:none}
.nav-overview-tag{flex-shrink:0;font-size:10.5px;font-weight:400;line-height:1.5;letter-spacing:.06em;color:#93a1ac;border:1px solid #e2e7ec;border-radius:3px;padding:1px 5px}
.nav-list>.nav-item:nth-last-child(-n+2)>.nav-dropdown{left:auto;right:0}
@media (max-width:550px){
.nav-toggle{width:26px;height:26px}
.nav-list{gap:2px 14px}
}
@media (prefers-reduced-motion:reduce){
html:not(.motion-on) .nav-chevron,html:not(.motion-on) .nav-row>a:after,html:not(.motion-on) .nav-list>.nav-item>a:after{transition:none}
}
.header-shell{max-width:1440px;margin:auto;padding-left:64px;padding-right:64px}
.site-strip{background:linear-gradient(90deg,var(--brand-deep),var(--brand));color:#fff;letter-spacing:.08em;padding:10px 0;font-size:12px}
.site-switch{z-index:30;position:relative}
.site-switch summary{cursor:pointer;list-style:none;transition:opacity .3s}
.site-switch summary:hover{opacity:.8}
.switch-panel{color:var(--ink);background:#fff;border-radius:10px;min-width:210px;padding:14px 0;position:absolute;top:32px;right:0;overflow:hidden;box-shadow:0 16px 40px #001e4624}
.switch-panel a{padding:9px 22px;font-size:13px;transition:all .25s;display:block}
.switch-panel a:hover{color:var(--brand);background:var(--brand-tint);padding-left:26px}
.site-header{border-bottom:1px solid var(--line);background:#fffffff7;padding:0}
.site-header>.header-shell{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:20px;min-height:88px;display:flex}
.brand{white-space:nowrap;color:var(--ink);letter-spacing:.02em;align-items:center;gap:14px;font-size:22px;font-weight:700;display:flex}
.brand-mark{background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;width:46px;height:46px;box-shadow:0 6px 16px color-mix(in srgb,var(--brand) 28%,transparent);border-radius:10px;place-items:center;font-family:Songti SC,SimSun,serif;font-size:26px;transition:transform .4s;display:grid}
.brand:hover .brand-mark{transform:rotate(-6deg)scale(1.04)}
.brand small{letter-spacing:.3em;color:var(--muted);margin-top:2px;font-size:9px;font-weight:400;display:block}
.brand-text{display:flex;flex-direction:column;justify-content:center;line-height:1.2}
.brand-image{transition:transform .4s;filter:saturate(1.02)}
.brand:hover .brand-image{transform:translateY(-1px)}
@media (max-width:1100px){
.header-shell{padding-left:44px;padding-right:44px}
}
@media (max-width:850px){
.header-shell{padding-left:28px;padding-right:28px}
.site-header>.header-shell{min-height:72px}
}
@media (max-width:550px){
.site-strip{letter-spacing:.02em;font-size:10px}
.site-header>.header-shell{min-height:64px}
.site-header nav{gap:15px;width:100%;font-size:12px;overflow-x:auto}
.brand{font-size:20px}
.brand-mark{width:40px;height:40px;font-size:22px}
}/* Adapt only the positioning to the existing full-page layout. */
:root{--header:128px}body{--brand-deep:color-mix(in srgb,var(--brand) 72%,#07121c);--brand-tint:color-mix(in srgb,var(--brand) 7%,white);--tint:var(--brand-tint);--line:color-mix(in srgb,var(--brand) 10%,#f1f3f5);--ink:#1b2733;--text:#5f6b76;--muted:#8a96a1;--gold:#d4ad6a;--gold-rgb:212,173,106;--accent:color-mix(in srgb,var(--brand) 55%,#3aa0ff)}.header-shell{width:100%;margin-inline:auto}.site-strip{position:fixed;top:0;left:0;right:0;z-index:65;height:40px;padding:10px 0;line-height:20px}.site-strip>.header-shell{display:flex;align-items:center;justify-content:space-between}.site-header{position:fixed;left:0;right:0;top:40px;z-index:50}.brand-image{width:240px;height:auto;max-height:60px;object-fit:contain}.menu-toggle{display:none}.switch-panel{max-height:70vh;overflow:auto}.preview-banner~.site-strip{top:34px}.preview-banner~.site-header{top:74px}.main-nav a{font-weight:500}.nav-dropdown a{font-weight:400}
@media(max-width:1100px){.brand-image{width:210px}}
@media(max-width:850px){:root{--header:112px}.site-header>.header-shell{min-height:72px;flex-wrap:wrap}.menu-toggle{display:flex;gap:12px;align-items:center;border:0;background:none;color:var(--brand);font-size:12px}.main-nav{display:none;margin:0 -8px 14px}.main-nav.open{display:block;max-height:calc(100dvh - 130px);overflow:auto!important}.nav-list{display:block}.nav-list>.nav-item{border-top:1px solid var(--line)}.nav-row{justify-content:space-between;min-height:46px}.nav-row>a{flex:1}.nav-dropdown{position:static;min-width:0;max-width:none;margin-bottom:0;max-height:0;padding:0 8px;border-width:0;opacity:0;visibility:hidden;overflow:hidden;transform:translateY(0);box-shadow:none;transition:max-height .28s cubic-bezier(.22,1,.36,1),opacity .2s,visibility .25s,padding .25s}.nav-open>.nav-dropdown{max-height:600px;padding:8px;margin-bottom:12px;opacity:1;visibility:visible}.nav-list>.nav-item:nth-last-child(-n+2)>.nav-dropdown{left:0;right:0}.brand-image{width:225px}.site-header nav{width:100%;font-size:13px}.site-strip{font-size:10px;letter-spacing:.02em}}
@media(max-width:550px){:root{--header:104px}.site-header>.header-shell{min-height:64px}.brand-image{width:200px}.main-nav{padding-top:0}.nav-row{gap:2px}.site-strip{font-size:9px}}
@media(prefers-reduced-motion:reduce){html:not(.motion-on) .nav-dropdown{transition:none}}