.backstreet-topbar{position:sticky;top:0;z-index:var(--fsmag-z-sticky,50);background:rgba(255,255,255,.6);backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);box-shadow:0 1px 2px rgba(0,0,0,.04),0 10px 30px rgba(0,0,0,.06);font-family:"Noto Serif SC","Source Han Serif SC",Songti SC,serif}@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){.backstreet-topbar{background:rgba(255,255,255,.92)}}.backstreet-topbar:after{content:"";display:block;height:0;border-top:3px solid var(--edition,#8a1e2b);border-bottom:1px solid var(--edition,#8a1e2b)}.backstreet-topbar-inner{max-width:var(--fsmag-width-shell,1400px);margin:0 auto;padding:.85rem var(--fsmag-space-read-pad,1.5rem);display:flex;align-items:center;justify-content:space-between;gap:1.5rem;flex-wrap:wrap}.backstreet-topbar-brand{display:inline-flex;align-items:center;gap:.7rem;text-decoration:none;white-space:nowrap}.backstreet-topbar-brand-cn{font-family:Baoli SC,STLiti,LiSu,Libian SC,"Noto Serif SC",serif;font-size:1.5rem;font-weight:400;letter-spacing:.08em;color:var(--edition,#8a1e2b)}.backstreet-topbar-brand-shoulder{display:inline-flex;flex-direction:column;gap:.15rem;padding-left:.7rem;border-left:1px solid var(--line-strong,#d0d0d0)}.backstreet-topbar-brand-shoulder-cn{font-size:.72rem;letter-spacing:.14em;color:var(--ink-soft,#3b3b3b)}.backstreet-topbar-brand-en{font-family:Montserrat,Inter,sans-serif;font-size:.62rem;letter-spacing:.2em;text-transform:uppercase;color:var(--muted,#8b8b8b)}.backstreet-topbar-menu{display:flex;align-items:center;gap:1.4rem;flex-wrap:wrap}.backstreet-topbar-menu a{font-size:.92rem;letter-spacing:.06em;color:var(--ink-soft,#3b3b3b);text-decoration:none;padding:.3rem 0;border-bottom:1px solid transparent;transition:color .2s,border-color .2s}.backstreet-topbar-menu a:hover{color:var(--edition,#8a1e2b);border-bottom-color:currentColor}.backstreet-topbar-menu a.is-active{color:var(--edition,#8a1e2b);font-weight:700;border-bottom-color:var(--edition,#8a1e2b)}.backstreet-topbar-search{display:inline-flex;align-items:center}@media (max-width:719px){.backstreet-topbar-inner{padding:.7rem 1rem;gap:.6rem}.backstreet-topbar-brand-cn{font-size:1.2rem}.backstreet-topbar-brand-en{display:none}.backstreet-topbar-brand-shoulder{padding-left:.55rem}.backstreet-topbar-brand-shoulder-cn{font-size:.62rem;letter-spacing:.1em}.backstreet-topbar-menu{width:100%;gap:.85rem;overflow-x:auto;scrollbar-width:none}.backstreet-topbar-menu::-webkit-scrollbar{display:none}.backstreet-topbar-menu a{font-size:.82rem;white-space:nowrap;flex-shrink:0}}