:root{--bg:#0B0B1A;--deep:#080812;--panel:#12121F;--soft:#1A1A2A;--hover:#222233;--ink:#FFFFFF;--text:#E8E8F0;--muted:#A0A0B8;--faint:#6B6B80;--purple:#FF2D6A;--violet:#9B4DFF;--teal:#FF4D8A;--coral:#E6005C;--magenta:#7B2CBF;--amber:#FFB3C9;--indigo:#FFFFFF;--border:rgba(255,45,106,.18);--focus:rgba(255,77,138,.45);--shadow:0 16px 48px rgba(0,0,0,.55);--radius:18px;--max:1280px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.78;overflow-x:hidden}a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}button{font:inherit}.site-main{padding:108px 20px 0}.wrap{width:min(100%,var(--max));margin:0 auto}.site-header{position:fixed;top:0;left:0;right:0;z-index:80;padding:14px 20px;pointer-events:none}.brand-bar{pointer-events:auto;width:min(100%,1080px);height:64px;margin:0 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32px),780px);z-index:101;transform:translate(-50%,-12px);opacity:0;visibility:hidden;pointer-events:none;background:var(--panel);border:1px solid var(--border);border-radius:28px;padding:22px;box-shadow:0 26px 70px rgba(49,46,129,.22);transition:.2s ease}.search-layer.is-open{transform:translate(-50%,0);opacity:1;visibility:visible;pointer-events:auto}.search-head{display:flex;align-items:center;justify-content:space-between;color:var(--ink)}.search-appearance{display:flex;align-items:center;gap:12px;min-height:58px;margin:16px 0;padding:0 18px;border-radius:18px;background:var(--soft);color:var(--muted);border:1px solid rgba(49,46,129,.06)}.search-appearance p{margin:0}.search-presets{display:flex;flex-wrap:wrap;gap:10px}.search-presets a{min-height:44px;display:inline-flex;align-items:center;padding:9px 15px;border:1px solid var(--border);border-radius:999px;color:var(--indigo);font-weight:800}.search-presets a:hover,.search-presets 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@media (max-width:760px){.site-header{padding:10px 16px}.brand-bar{height:56px;grid-template-columns:44px 1fr 62px;gap:8px;padding:6px 7px}.brand-pills,.search-open{display:none}.brand-mark{grid-column:2;width:auto;justify-self:center;max-width:140px}.brand-mark img{max-height:32px}.mobile-app-link{grid-column:3;display:flex;align-items:center;justify-content:center;min-height:44px;padding:7px 10px;border-radius:999px;background:var(--soft);color:var(--purple);font-size:13px;font-weight:900}.site-main{padding:86px 16px 0}.dock{grid-template-columns:1fr;padding:24px;border-radius:28px}.dock-copy{font-size:16px}.grid-3,.grid-4,.duo,.split,.product-grid,.index-grid,.feature-list{grid-template-columns:1fr}.mosaic{grid-template-columns:1fr;grid-template-rows:auto}.mosaic article:first-child{grid-row:auto}.masonry{columns:1}.folder{grid-template-columns:50px 1fr}.folder small{grid-column:2}.rank-item{grid-template-columns:72px 1fr}.rank-number{font-size:46px}.footer-groups{grid-template-columns:repeat(2,1fr)}.drawer-groups{grid-template-columns:1fr}.search-layer{top:0;left:0;width:100%;height:100dvh;border-radius:0;transform:none;background:var(--bg);padding:18px 16px}.search-layer.is-open{transform:none}.global-drawer{width:100%;border-radius:26px 26px 0 0}.mobile-island{position:fixed;left:16px;right:16px;bottom:calc(10px + env(safe-area-inset-bottom));z-index:70;height:52px;display:grid;grid-template-columns:repeat(5,1fr);align-items:center;padding:6px;background:rgba(255,255,255,.96);border:1px solid var(--border);border-radius:22px;box-shadow:0 12px 36px rgba(49,46,129,.18);backdrop-filter:blur(14px)}.mobile-island a{position:relative;height:40px;display:flex;align-items:center;justify-content:center;border-radius:16px;color:var(--muted);font-size:12px;font-weight:800}.mobile-island a.is-current{color:var(--purple);background:var(--soft)}.mobile-island a.is-current:after{content:"";position:absolute;bottom:3px;width:5px;height:5px;border-radius:50%;background:var(--purple)}.site-footer{padding-bottom:calc(110px + env(safe-area-inset-bottom))}.page-hero{padding-top:34px}.section{padding:30px 0}.topic-track{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.page-hero h1{font-size:40px}.topic-track{grid-template-columns:1fr}.footer-groups{grid-template-columns:1fr 1fr}.section-head{align-items:flex-start;flex-direction:column}.card{padding:20px}.folder{padding:16px}.rank-item{padding:20px}.step{grid-template-columns:56px 1fr;gap:12px}.article-body{padding:24px 20px}.footer-groups{gap:16px 12px}}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}


/* 51吃瓜品牌与导航覆盖 */
html{background:#0B0B1A}
body{background:#0B0B1A;color:#E8E8F0}
.site-main{padding:94px 15px 0}
.site-header{position:fixed;top:0;left:0;right:0;z-index:80;padding:0;pointer-events:auto;background:rgba(8,8,18,.92);border-bottom:1px solid rgba(255,45,106,.16);backdrop-filter:blur(16px)}
.top-nav{width:100%}.nav-inner{width:min(1280px,calc(100% - 30px));height:72px;margin:auto;display:flex;align-items:center;gap:16px}.brand-mark{width:auto;min-width:120px;height:52px;display:flex;justify-content:flex-start;padding:4px 0}.brand-mark img{max-width:150px;max-height:44px;object-fit:contain}.brand-mark span{font-size:26px;font-weight:950;letter-spacing:-.05em;background:linear-gradient(135deg,#FF4D8A,#FF2D6A,#9B4DFF);-webkit-background-clip:text;color:transparent}.desktop-main{display:flex;align-items:center;gap:2px;flex:1}.desktop-main a,.nav-quiet{min-height:44px;display:inline-flex;align-items:center;padding:0 13px;border-radius:999px;color:#C8C8D8;font-size:14px;font-weight:800;white-space:nowrap;border:1px solid transparent}.desktop-main a:hover,.desktop-main a:focus-visible,.desktop-main a.is-current,.nav-quiet:hover,.nav-quiet:focus-visible{color:#fff;background:#222233;border-color:rgba(255,77,138,.35);outline:none}.desktop-main a.is-current{box-shadow:inset 0 -2px 0 #FF4D8A}.nav-actions{display:flex;align-items:center;gap:8px}.nav-app{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 19px;border-radius:999px;background:linear-gradient(135deg,#FF4D8A 0%,#FF2D6A 50%,#E6005C 100%);color:#fff;font-weight:900;white-space:nowrap}.round-control{background:#171724;color:#fff;border-color:rgba(255,77,138,.28)}.round-control:hover,.round-control:focus-visible{border-color:#FF4D8A;box-shadow:0 0 0 4px rgba(255,77,138,.12);outline:none}.mobile-menu{display:none}
.page-hero{padding-top:48px}.page-hero h1{color:#fff}.page-hero p{color:#A0A0B8}.page-kicker{color:#FFB3C9}.page-kicker:before{background:linear-gradient(90deg,#FF4D8A,#9B4DFF)}.section-head h2,.card h2,.card h3,.article-body h2,.index-item h3,.feature b,.policy h2,.qa h2,.notice-box h2,.folder h3{color:#fff}.section-head p,.card p,.folder p,.article-body p,.policy p,.qa p,.notice-box p,.index-item p{color:#B0B0C0}.card,.article-body,.policy,.qa,.notice-box,.index-item,.feature,.folder,.rank-item,.timeline article,.step,.soft-block{background:#12121F;border-color:rgba(255,45,106,.18);box-shadow:0 16px 48px rgba(0,0,0,.32)}.card-label,.text-link,.page-kicker{color:#FFB3C9}.card-label:before{background:#FF2D6A}.accent-teal .card-label:before{background:#9B4DFF}.accent-coral .card-label:before{background:#FF4D8A}.accent-magenta .card-label:before{background:#E6005C}.rank-number{color:#FF2D6A!important}.rank-item:nth-child(2) .rank-number{color:#FF4D8A!important}.rank-item:nth-child(3) .rank-number{color:#9B4DFF!important}.rank-item:nth-child(4) .rank-number{color:#E6005C!important}.rank-item:nth-child(5) .rank-number{color:#FFB3C9!important}.status{background:#222233;color:#FFB3C9}.media-frame{background:radial-gradient(circle at 18% 20%,rgba(255,77,138,.22),transparent 30%),radial-gradient(circle at 82% 70%,rgba(155,77,255,.25),transparent 28%),linear-gradient(135deg,#171724,#0B0B1A);border-color:rgba(255,45,106,.18)}.media-placeholder:before{background:rgba(255,77,138,.18)}.media-placeholder:after{background:rgba(155,77,255,.16)}.media-placeholder span{border-color:rgba(255,179,201,.16)}.btn,.topic-link,.number-link{background:#12121F;color:#fff;border-color:rgba(255,45,106,.18)}.btn.primary{background:linear-gradient(135deg,#FF4D8A 0%,#FF2D6A 50%,#E6005C 100%);color:#fff}.btn:hover,.btn:focus-visible,.topic-link:hover,.topic-link:focus-visible{border-color:#FF4D8A;box-shadow:0 0 0 4px rgba(255,77,138,.1)}.dot{background:#FF2D6A}.dot.teal{background:#9B4DFF}.dot.coral{background:#FF4D8A}.dot.magenta{background:#E6005C}.dot.amber{background:#FFB3C9}.dock{background:#12121F;border-color:rgba(255,45,106,.18);box-shadow:0 16px 48px rgba(0,0,0,.45)}.dock h1{color:#fff}.dock-copy{color:#A0A0B8}
.site-footer{background:#05050A;color:#C8C8D8;border-top:1px solid rgba(255,45,106,.14);padding:62px 15px 90px}.footer-inner{width:min(1280px,100%);margin:auto}.footer-brand{display:flex;align-items:flex-start;gap:18px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.07)}.footer-logo{width:auto;min-width:120px}.footer-logo img{max-width:140px;max-height:48px}.footer-brand>div strong{display:block;color:#fff;font-size:24px}.footer-brand>div span{color:#FFB3C9;font-weight:900;letter-spacing:.12em}.footer-brand p{max-width:720px;color:#8E8EA1}.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;padding:32px 0}.footer-groups h2{font-size:14px;color:#fff}.footer-groups a{display:block;padding:5px 0;color:#9494A8}.footer-groups a:hover,.footer-groups a:focus-visible{color:#FFB3C9}.footer-notice,.footer-copy{color:#77778C;font-size:13px}
.page-overlay{z-index:90;background:rgba(0,0,0,.66);backdrop-filter:blur(3px)}
.global-drawer{position:fixed;left:auto;right:0;top:0;bottom:0;width:min(470px,88vw);max-height:none;height:100dvh;overflow:hidden;z-index:100;transform:translateX(102%);visibility:hidden;pointer-events:none;background:#0E0E18;border:0;border-left:1px solid rgba(255,77,138,.22);border-radius:0;box-shadow:-24px 0 64px rgba(0,0,0,.45);transition:transform .26s ease,visibility .26s ease}.global-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{height:72px;padding:0 18px;border-bottom:1px solid rgba(255,255,255,.07);background:#0E0E18}.drawer-brand{display:flex;align-items:center;gap:10px}.drawer-brand img{max-width:128px;max-height:40px}.drawer-brand strong{color:#fff;font-size:22px}.drawer-brand span{font-size:11px;color:#FFB3C9;letter-spacing:.1em}.drawer-groups{height:calc(100dvh - 72px);overflow-y:auto;padding:18px 20px 36px;display:block}.drawer-groups section{padding:0;margin:0 0 24px}.drawer-groups h2{color:#FFB3C9;font-size:13px;letter-spacing:.1em}.drawer-groups a{display:block;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.06)}.drawer-groups a strong{display:block;color:#fff}.drawer-groups a span{display:block;color:#858599;font-size:13px;margin-top:3px}
.search-layer{position:fixed;top:72px;left:0;right:0;width:100%;z-index:101;transform:translateY(-12px);opacity:0;visibility:hidden;pointer-events:none;background:rgba(14,14,24,.985);border:0;border-bottom:1px solid rgba(255,77,138,.22);border-radius:0;padding:0;box-shadow:0 26px 70px rgba(0,0,0,.45);transition:.2s ease}.search-layer.is-open{transform:translateY(0);opacity:1;visibility:visible;pointer-events:auto}.search-shell{width:min(1040px,calc(100% - 30px));margin:auto;padding:28px 0 32px}.search-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px}.search-head h2{margin:6px 0 18px;color:#fff}.search-input{display:block}.search-input input{width:100%;height:58px;border-radius:16px;border:1px solid rgba(255,77,138,.25);background:#181824;color:#fff;padding:0 18px;outline:none}.search-input input:focus{border-color:#FF4D8A;box-shadow:0 0 0 4px rgba(255,77,138,.1)}.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.search-presets a{padding:9px 14px;border-radius:999px;background:#222233;border:1px solid rgba(255,255,255,.06);color:#D8D8E3}.search-presets a:hover,.search-presets a:focus-visible{border-color:#FF4D8A;color:#fff}.search-empty{color:#8E8EA2}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.mobile-bottom{display:none}
.overlay-open{overflow:hidden}
:focus-visible{outline:3px solid rgba(255,77,138,.48);outline-offset:3px}
@media(max-width:1040px){.desktop-main{display:none}.nav-inner{justify-content:space-between}.brand-mark{flex:1;justify-content:center}.desktop-action{display:none!important}.mobile-menu{display:grid}.nav-actions{min-width:62px;justify-content:flex-end}.nav-app{padding:0 14px}.site-main{padding-top:82px}}
@media(max-width:720px){body{padding-bottom:76px}.site-header{height:64px}.nav-inner{height:64px;width:calc(100% - 24px);gap:8px}.brand-mark{min-width:0}.brand-mark img{max-width:118px;max-height:38px}.brand-mark span{font-size:22px}.site-main{padding:76px 16px 0}.wrap{width:100%}.page-hero{padding-top:36px}.page-hero h1{font-size:clamp(36px,11vw,52px)}.search-layer{top:0;bottom:0;height:100dvh;overflow-y:auto;background:#0B0B1A}.search-shell{width:calc(100% - 32px);padding:20px 0}.global-drawer{width:88vw}.drawer-head{height:64px}.drawer-groups{height:calc(100dvh - 64px)}.footer-groups{grid-template-columns:repeat(2,1fr)}.mobile-bottom{position:fixed;left:12px;right:12px;bottom:max(10px,env(safe-area-inset-bottom));height:56px;z-index:70;display:grid;grid-template-columns:repeat(5,1fr);background:rgba(18,18,31,.96);border:1px solid rgba(255,77,138,.25);border-radius:18px;box-shadow:0 16px 48px rgba(0,0,0,.55);backdrop-filter:blur(14px);overflow:hidden}.mobile-bottom a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;color:#7F7F94;font-size:11px;min-width:0}.mobile-bottom a span{font-size:13px}.mobile-bottom a.is-current{color:#FF4D8A;background:rgba(255,45,106,.08)}.site-footer{padding-bottom:110px}.grid-4,.topic-track{grid-template-columns:1fr 1fr}.footer-brand{display:block}.footer-logo{display:inline-block;margin-bottom:12px}}
@media(max-width:480px){.footer-groups{grid-template-columns:1fr 1fr}.grid-4,.topic-track{grid-template-columns:1fr}.page-hero h1{font-size:38px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}