/* 51吃瓜 · 极昼情报局清晰资讯矩阵 */
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@media(max-width:390px){.quick-grid{grid-template-columns:1fr 1fr}.quick-tile{min-height:125px}.brand small{font-size:.55rem}.header-actions{gap:8px}.hero-copy h1{font-size:2.35rem}.hero-search button{font-size:.64rem}.hero-search input{font-size:.74rem}.footer-main{gap:18px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

.back-top{position:fixed;z-index:30;right:22px;bottom:22px;width:42px;height:42px;border:1px solid var(--line);border-radius:50%;background:#fff;color:var(--plum);box-shadow:var(--shadow);font-size:1.2rem}.back-top[hidden]{display:none!important}