/* 51吃瓜 | responsive editorial theme */
:root{color-scheme:dark;--bg:#10151D;--surface:#19212C;--raised:#222C38;--text:#E0E4E8;--title:#F7F5F2;--muted:#BBC4CC;--coral:#FF6B7D;--blue:#9CC5DB;--line:#34414F;--radius:12px;--max:1200px}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:400 16px/1.75 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;overflow-x:clip}button,a{touch-action:manipulation}a{color:inherit;text-decoration:none}a:hover{color:var(--coral)}a:active,button:active{opacity:.8}a:focus-visible,button:focus-visible{outline:3px solid var(--blue);outline-offset:3px}p{margin:0 0 1.2em}h1,h2,h3{color:var(--title);line-height:1.3;margin:0 0 .7em;font-weight:750}h1{font-size:clamp(27px,3.25vw,38px)}h2{font-size:clamp(23px,2.2vw,27px)}h3{font-size:clamp(18px,1.7vw,21px)}ul,ol{padding-left:1.25em}li{margin-bottom:.5em}.wrap{width:min(var(--max),calc(100% - 48px));margin-inline:auto}.skip-link{position:absolute;left:8px;top:-60px;padding:8px 18px;background:var(--title);color:var(--bg);z-index:100}.skip-link:focus{top:8px}.site-head{position:relative;z-index:20;background:var(--bg);border-bottom:1px solid var(--line)}.brandbar{height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:12px;min-width:0}.brand-text{display:flex;flex-direction:column;line-height:1.1;gap:3px;white-space:nowrap}.brand-text strong{font-size:22px;color:var(--title)}.brand-text small{font-size:10px;letter-spacing:.12em;color:var(--muted)}.header-actions{display:flex;align-items:center;gap:16px;margin-left:auto}.guide-link{font-size:14px;color:var(--text)}button{font:inherit;color:inherit;cursor:pointer}.menu-button,.close-button{min-height:44px;padding:6px 15px;border-radius:9px;border:1px solid var(--line);background:var(--surface);font-weight:650}.menu-bars{font-size:18px;margin-right:5px}.desktop-nav{border-top:1px solid var(--line);min-height:48px}.nav-inner{display:flex;gap:clamp(12px,2.3vw,32px);align-items:stretch}.nav-inner a{height:48px;display:flex;align-items:center;white-space:nowrap;font-size:14px;border-bottom:2px solid transparent}.nav-inner a.selected,.nav-inner a:hover{color:var(--coral);border-bottom-color:var(--coral)}.category-panel{position:absolute;left:0;right:0;top:100%;max-height:min(80vh,760px);overflow-y:auto;background:var(--surface);border-bottom:1px solid var(--line);box-shadow:0 18px 30px #0007}.category-panel[hidden]{display:none!important}.panel-top{display:flex;align-items:center;justify-content:space-between;padding:22px 0;border-bottom:1px solid var(--line)}.panel-top strong{font-size:22px;color:var(--title)}.panel-groups{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:28px;padding:28px 0 36px}.panel-groups h2{font-size:18px}.menu-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.menu-links a{padding:10px;border-radius:8px;font-size:14px;min-width:0}.menu-links a:hover,.menu-links a[aria-current]{background:var(--raised);color:var(--coral)}main{min-height:60vh}.section{margin-block:68px}.eyebrow{font-size:12px;letter-spacing:.12em;font-weight:750;color:var(--blue);margin:0 0 10px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:22px}.section-head p{max-width:600px;color:var(--muted)}.lead{font-size:17px;line-height:1.86;color:var(--text);max-width:900px}.intro-area{padding-top:48px}.intro-area h1{margin-bottom:16px}.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:20px}.breadcrumb a:hover{color:var(--coral)}.hero-visual{aspect-ratio:16/4;max-height:320px}.media-slot{background:var(--raised);border:1px solid var(--line);border-radius:var(--radius);width:100%;display:grid;place-items:center;overflow:hidden;position:relative;aspect-ratio:16/10;min-width:0}.media-slot img{display:block;width:100%;height:100%;object-fit:contain;object-position:center}.media-slot .media-fallback{display:grid;place-items:center;text-align:center;min-height:100%;width:100%;padding:24px;font-size:clamp(18px,2vw,29px);letter-spacing:.07em;color:var(--title);font-weight:750;background:radial-gradient(circle at 85% 10%,#34414F 0 6%,transparent 6.5%),linear-gradient(125deg,var(--raised),var(--surface))}.media-slot .media-fallback::before{content:"";position:absolute;inset:12px;border:1px solid #ffffff14;border-radius:7px;pointer-events:none}.brand-visual{width:40px;height:40px;aspect-ratio:1;border-radius:8px;flex:none}.brand-visual .media-fallback{font-size:12px;letter-spacing:0;padding:2px}.visual{max-height:240px}.app-visual{aspect-ratio:4/5;max-height:400px}.hero-section{padding-top:26px}.hero-copy{max-width:880px;padding-top:22px}.hero-copy .lead{margin-bottom:18px}.button-row{display:flex;gap:12px;flex-wrap:wrap}.button-link{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:8px 20px;border:1px solid var(--line);background:var(--surface);border-radius:9px;font-weight:700}.button-link.primary{background:var(--coral);border-color:var(--coral);color:#10151D}.button-link.primary:hover{background:#ff8c9a;color:#10151D}.grid{display:grid;gap:20px}.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-four{grid-template-columns:repeat(4,minmax(0,1fr))}.feature-grid{display:grid;grid-template-columns:1.65fr 1fr;grid-template-rows:1fr 1fr;gap:20px}.feature-grid>:first-child{grid-row:span 2}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;min-width:0}.card h3{margin-top:13px}.card p{color:var(--muted);font-size:15px}.feature-grid .card{height:100%}.feature-grid .card:first-child .visual{max-height:280px}.topic-card{padding:24px;border-top:2px solid var(--line);background:var(--surface);border-radius:var(--radius)}.topic-card h3{color:var(--title)}.topic-card p{color:var(--muted);font-size:15px}.text-link{color:var(--coral);font-weight:750;display:inline-block;padding:6px 0}.text-link:hover{color:#ffa1ad}.duo .card{display:flex;flex-direction:column}.duo .card .visual{aspect-ratio:16/8.5}.duo .card p{font-size:16px;color:var(--text)}.duo ul{color:var(--muted)}.content-layout{display:grid;grid-template-columns:minmax(0,2.2fr) minmax(220px,.85fr);gap:44px}.reading-article{min-width:0}.reading-article section{margin-bottom:38px;padding-top:12px;border-top:1px solid var(--line)}.reading-article p{max-width:78ch}.reading-aside{align-self:start;position:sticky;top:20px}.aside-box{background:var(--surface);border:1px solid var(--line);padding:24px;border-radius:var(--radius)}.aside-box h2{font-size:20px}.aside-box a{display:block;padding:9px 0;border-bottom:1px solid var(--line);font-size:14px}.aside-box a:last-child{border:0}.page-banner{display:grid;grid-template-columns:1.3fr .9fr;gap:28px;align-items:center;margin-block:30px 48px}.page-banner .visual{max-height:260px}.page-banner p{color:var(--muted)}.body-panels{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.body-panels section{background:var(--surface);border:1px solid var(--line);padding:24px;border-radius:12px}.body-panels section p{margin:0}.body-panels section h2{font-size:22px}.type-matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-bottom:32px}.type-matrix div{background:var(--raised);border:1px solid var(--line);border-radius:9px;padding:16px;font-size:14px;color:var(--title);font-weight:750}.timeline{counter-reset:stage;display:grid;gap:20px}.timeline section{padding:22px 24px 22px 72px;border-left:2px solid var(--blue);background:var(--surface);border-radius:0 12px 12px 0;position:relative}.timeline section:before{counter-increment:stage;content:counter(stage,decimal-leading-zero);position:absolute;left:17px;top:20px;color:var(--blue);font-size:19px;font-weight:800}.timeline p{margin:0}.status-list{display:grid;gap:14px}.status-list section{background:var(--surface);padding:20px 24px;border-left:3px solid var(--coral)}.status-list section h2{font-size:20px}.pill{display:inline-block;color:var(--blue);font-size:12px;border:1px solid var(--line);padding:4px 10px;border-radius:6px;margin-right:8px}.service-copy{max-width:910px}.service-copy section{padding:22px 0;border-top:1px solid var(--line)}.service-copy p{max-width:80ch}.faq-list{display:grid;gap:12px;max-width:940px}.faq-list details{background:var(--surface);border:1px solid var(--line);border-radius:11px;padding:18px 23px}.faq-list summary{cursor:pointer;color:var(--title);font-size:18px;font-weight:750;min-height:44px;display:list-item}.faq-list p{margin:12px 0 0;color:var(--text)}.related{border-top:1px solid var(--line);padding-top:24px}.related a{margin-right:24px}.service-nav{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.service-nav a{padding:18px;border:1px solid var(--line);background:var(--surface);border-radius:9px;min-height:60px}.trust-copy{max-width:920px;line-height:1.9}.site-footer{border-top:1px solid var(--line);background:#0d1219;margin-top:60px;padding-top:44px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px}.footer-grid h2{font-size:17px}.footer-grid a{display:block;font-size:14px;padding:5px 0}.footer-grid p{color:var(--muted);max-width:450px}.footer-brand{font-size:24px;color:var(--title);font-weight:800}.footer-brand span{font-size:11px;letter-spacing:.1em;color:var(--muted);vertical-align:middle}.footer-bottom{padding:20px 0;margin-top:36px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:18px;font-size:13px;color:var(--muted)}.mobile-dock{display:none} .inline-list{display:flex;flex-wrap:wrap;gap:8px 22px}.mini-label{font-size:13px;color:var(--blue);font-weight:700}.section:last-child{margin-bottom:45px}
@media(max-width:1100px){.grid-four{grid-template-columns:repeat(2,minmax(0,1fr))}.nav-inner{gap:15px}.nav-inner a{font-size:13px}.panel-groups{gap:18px}}@media(max-width:820px){.desktop-nav{display:none}.brandbar{height:60px}.panel-groups{grid-template-columns:1fr}.category-panel{max-height:calc(100dvh - 60px);box-shadow:none}.menu-links{grid-template-columns:repeat(3,minmax(0,1fr))}.wrap{width:calc(100% - 48px)}.feature-grid{grid-template-columns:1fr 1fr}.feature-grid>:first-child{grid-column:1/-1;grid-row:auto}.grid-three{grid-template-columns:repeat(2,minmax(0,1fr))}.content-layout{grid-template-columns:1fr}.reading-aside{position:static}.service-nav{grid-template-columns:repeat(3,minmax(0,1fr))}.footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:24px}.page-banner{grid-template-columns:1fr 1fr}.section{margin-block:54px}}@media(max-width:600px){.wrap{width:calc(100% - 32px)}body{font-size:16px}.guide-link{display:none}.brand-text strong{font-size:20px}.header-actions{gap:8px}.brand-visual{width:36px;height:36px}.panel-groups{padding:20px 0}.menu-links{grid-template-columns:repeat(2,minmax(0,1fr))}.menu-links a{min-height:44px}.section{margin-block:40px}.hero-section{padding-top:18px}.hero-visual{aspect-ratio:16/9;max-height:220px}.hero-copy{padding-top:20px}.lead{font-size:16px}.feature-grid,.grid-two,.grid-three,.grid-four,.body-panels,.page-banner,.footer-grid{grid-template-columns:1fr}.feature-grid>:first-child{grid-column:auto}.feature-grid .card:first-child .visual{max-height:230px}.card,.topic-card{padding:20px}.media-slot.visual{max-height:none;aspect-ratio:16/9}.duo .card .visual{aspect-ratio:16/9}.type-matrix{grid-template-columns:repeat(2,minmax(0,1fr))}.section-head{display:block}.intro-area{padding-top:30px}.page-banner{gap:20px}.service-nav{grid-template-columns:repeat(2,minmax(0,1fr))}.site-footer{padding-bottom:calc(74px + env(safe-area-inset-bottom));margin-top:42px}.footer-bottom{display:block}.mobile-dock{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;z-index:15;bottom:0;left:0;right:0;background:#19212Cf5;border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}.mobile-dock a{height:62px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:1px;color:var(--muted)}.mobile-dock a[aria-current]{color:var(--coral)}.mobile-dock a span{font-size:23px;line-height:1.1}.mobile-dock a small{font-size:12px}.menu-open .mobile-dock{display:none}.timeline section{padding-left:60px}.timeline section:before{left:11px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}