/* 51吃瓜 editorial visual system: mint-green, compact news indexing, restrained orange emphasis */
:root {
  color-scheme: light;
  --green:#168C78;
  --green-dark:#106C60;
  --mint:#BFE8D8;
  --deep:#203B39;
  --paper:#FAFBF7;
  --panel:#EDF5EF;
  --ink:#253330;
  --muted:#637570;
  --warm:#B95020;
  --line:#DCE9DF;
  --line-strong:#B9CFC5;
  --radius:8px;
  --shell:1172px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --text-sm:.82rem;
  --text-md:1rem;
  --text-lg:1.14rem;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-synthesis:none;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:100px}
body{margin:0;background:var(--paper);color:var(--ink);font-size:16px;line-height:1.7}
body::before{content:"";display:block;height:3px;background:linear-gradient(90deg,var(--green) 0%,var(--mint) 74%,var(--warm) 100%)}
::selection{background:var(--mint);color:var(--deep)}
a{color:inherit;text-decoration:none;transition:color .16s var(--ease),background-color .16s var(--ease),border-color .16s var(--ease)}
a:hover{color:var(--green-dark)}
a:focus-visible,button:focus-visible{outline:3px solid var(--warm);outline-offset:4px;border-radius:3px}
img{max-width:100%;height:auto;display:block}
figure,blockquote,p,h1,h2,h3,h4{margin-top:0}
p{margin-bottom:1rem}
h1,h2,h3{color:var(--deep);line-height:1.34;letter-spacing:-.024em;overflow-wrap:anywhere}
h1{font-size:clamp(1.8rem,2.8vw,2.75rem);font-weight:780}
h2{font-size:clamp(1.35rem,2vw,1.85rem);font-weight:750}
h3{font-size:1.16rem;font-weight:740}
.shell{width:min(var(--shell),calc(100% - 56px));margin-inline:auto}
.skip{position:absolute;z-index:99;top:-150px;left:16px;background:#fff;color:var(--deep);padding:10px 14px;border:2px solid var(--green)}
.skip:focus{top:16px}
.site-header{background:var(--paper);border-bottom:1px solid var(--line);position:relative;z-index:10}
.header-row{min-height:84px;display:flex;align-items:center;gap:40px;justify-content:space-between}
.brand{display:inline-flex;align-items:center;gap:11px;min-width:0;flex-shrink:0}
.brand img{width:43px;height:43px;object-fit:contain;flex-shrink:0}
.brand span{display:flex;flex-direction:column;line-height:1.18;gap:6px}
.brand strong{font-size:1.48rem;letter-spacing:-.06em;font-weight:850;color:var(--green-dark)}
.brand small{color:var(--muted);font-size:.68rem;letter-spacing:.08em;white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:32px;flex-wrap:wrap;font-size:.91rem;font-weight:670}
.main-nav a{display:inline-flex;align-items:center;min-height:42px;position:relative;padding:8px 2px;color:var(--deep)}
.main-nav a:hover,.main-nav a[aria-current="page"]{color:var(--green)}
.main-nav a[aria-current="page"]::after{content:"";height:3px;background:var(--green);position:absolute;bottom:-1px;left:0;right:0;border-radius:2px}
.topline{display:flex;align-items:center;gap:9px;min-height:54px;border-bottom:1px solid var(--line);font-size:.76rem;letter-spacing:.08em;font-weight:690;color:var(--green-dark)}
.topline__right{margin-left:auto;font-size:.72rem;color:var(--muted);letter-spacing:.025em}
.signal{display:inline-block;border:2px solid var(--paper);box-shadow:0 0 0 1px var(--green);background:var(--green);width:9px;height:9px;border-radius:50%}
.eyebrow{display:block;text-transform:uppercase;color:var(--green-dark);font-size:.76rem;font-weight:780;letter-spacing:.1em;margin:0 0 16px}
.text-link{display:inline-flex;gap:10px;align-items:center;color:var(--green-dark);font-size:.91rem;font-weight:780;border-bottom:1px solid var(--mint);padding:4px 0}
.text-link:hover{border-color:var(--warm);color:var(--warm)}
.lead{display:grid;grid-template-columns:minmax(0,.87fr) minmax(0,1.24fr);gap:60px;border-bottom:1px solid var(--line);padding:52px 0 58px;align-items:start}
.lead__intro{position:relative;padding-top:12px}
.lead__intro::before{position:absolute;top:0;left:0;width:38px;height:3px;background:var(--warm);content:""}
.lead__intro h1{margin-bottom:24px;max-width:17ch}
.lead__desc{color:var(--muted);font-size:1rem;line-height:1.94;max-width:440px;margin-bottom:27px}
.lead__stories{min-width:0}
.section-kicker{display:flex;justify-content:space-between;border-bottom:1px solid var(--line-strong);padding-bottom:12px;margin-bottom:19px;text-transform:uppercase;font-size:.76rem;color:var(--muted);font-weight:750;letter-spacing:.08em}
.section-kicker span:first-child{color:var(--warm)}
.story{min-width:0}
.story__media{display:block;aspect-ratio:1.6;background:var(--panel);overflow:hidden;border-radius:var(--radius)}
.story__media img{height:100%;width:100%;object-fit:cover;transition:transform .4s var(--ease)}
.story__media:hover img{transform:scale(1.025)}
.story__body{min-width:0}
.story__meta{display:flex;align-items:center;flex-wrap:wrap;gap:11px;font-size:.72rem;font-weight:710;color:var(--muted);letter-spacing:.03em;margin:0 0 12px}
.story__meta span:first-child{display:inline-block;padding:2px 7px;background:var(--panel);color:var(--green-dark);border-radius:3px}
.story h3{margin:0 0 10px;font-size:1.08rem;line-height:1.46}
.story p{margin:0;color:var(--muted);font-size:.86rem;line-height:1.77}
.story__link{color:var(--green-dark);font-size:.78rem;font-weight:750;display:inline-flex;gap:4px;margin-top:11px}
.story__link:hover{color:var(--warm)}
.story--feature .story__media{margin-bottom:17px}
.story--feature h3{font-size:clamp(1.16rem,1.55vw,1.35rem)}
.lead__compact{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:25px;margin-top:25px;padding-top:22px;border-top:1px solid var(--line)}
.lead__compact .story__meta{margin-bottom:7px}
.lead__compact .story h3{font-size:1rem}
.lead__compact .story p{font-size:.8rem}
.feed{padding:56px 0 62px;border-bottom:1px solid var(--line)}
.section-heading{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:25px}
.section-heading .eyebrow{margin-bottom:9px}
.section-heading h2{margin:0}
.section-heading>p{max-width:385px;color:var(--muted);font-size:.84rem;line-height:1.7;margin:0 0 4px}
.feed__grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.feed__grid .story{display:flex;flex-direction:column;gap:16px}
.feed__grid .story--feature .story__media{margin-bottom:0;aspect-ratio:1.6}
.feed__grid .story__body{display:flex;flex-direction:column;align-items:start;flex-grow:1}
.feed__grid .story h3{font-size:1.13rem}
.feed__grid .story__link{margin-top:auto;padding-top:12px}
.split{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:66px;padding:65px 0;background:var(--paper);border-bottom:1px solid var(--line)}
.split__title{padding:20px 30px 22px 0}
.split__title h2{max-width:17ch;margin-bottom:17px}
.split__title>p:not(.eyebrow){color:var(--muted);max-width:370px;line-height:1.86}
.split__title .text-link{margin-top:8px}
.split__list{border-top:1px solid var(--line-strong)}
.split__list .story{display:block;border-bottom:1px solid var(--line);padding:25px 0}
.split__list .story__meta{margin-bottom:8px}
.split__list .story p{max-width:600px}
.mini-feed{padding:60px 0 66px;border-bottom:1px solid var(--line)}
.mini-feed__items{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
.mini-feed__items .story{border-top:2px solid var(--mint);padding-top:23px}
.mini-feed__items .story h3{font-size:1.16rem}
.mini-feed__items .story p{max-width:520px}
.brand-info{display:flex;align-items:start;justify-content:space-between;gap:60px;border:1px solid var(--line);border-left:4px solid var(--green);border-radius:var(--radius);background:var(--panel);padding:30px 33px;margin:45px 0 74px}
.brand-info>div{max-width:690px}
.brand-info .eyebrow{margin-bottom:7px}
.brand-info h2{font-size:1.4rem;margin-bottom:10px}
.brand-info p{color:var(--muted);font-size:.88rem;line-height:1.88;margin-bottom:0}
.brand-info strong{color:var(--deep);overflow-wrap:anywhere}
.brand-info__note{max-width:265px;padding-left:18px;border-left:1px solid var(--line-strong);flex-shrink:0}
.site-footer{background:#18332F;color:#DEEBE4;padding:54px 0 19px}
.footer-grid{display:flex;justify-content:space-between;gap:60px;padding-bottom:42px}
.footer-grid>div{max-width:490px}
.footer-grid strong{font-size:1.3rem;color:white}
.footer-grid p{margin:11px 0 0;color:#B2CBC1;font-size:.85rem;line-height:1.85}
.footer-grid nav{display:flex;gap:32px;flex-wrap:wrap;align-content:start;font-size:.84rem;font-weight:650}
.footer-grid a:hover{color:#9DE3CF}
.footer-bottom{padding-top:19px;border-top:1px solid #35554B;font-size:.73rem;color:#B2CBC1;display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap}
/* topic hub */
.inner-main{padding-bottom:80px}
.crumb{display:flex;align-items:center;gap:10px;flex-wrap:wrap;min-height:67px;color:var(--muted);font-size:.78rem}
.crumb a{color:var(--green-dark)}
.crumb a:hover{text-decoration:underline}
.inner-hero{padding:31px 0 49px;border-bottom:1px solid var(--line-strong);position:relative}
.inner-hero::after{position:absolute;bottom:-2px;left:0;width:65px;height:3px;background:var(--warm);content:""}
.inner-hero h1{margin-bottom:19px}
.inner-hero>p:last-child{color:var(--muted);max-width:750px;line-height:1.92;font-size:1rem;margin-bottom:0}
.topic-layout{display:grid;grid-template-columns:minmax(0,1fr) 278px;gap:75px;padding-top:48px;align-items:start}
.group-heading{font-size:1.28rem;margin:0 0 18px}
.topic-row{display:grid;grid-template-columns:50px 1fr;gap:22px;padding:28px 0;border-top:1px solid var(--line)}
.topic-row:first-of-type{border-top:2px solid var(--mint)}
.topic-row__number{color:var(--green);font-size:1.04rem;font-weight:840;font-variant-numeric:tabular-nums;letter-spacing:.08em}
.topic-row h3{font-size:1.23rem;margin-bottom:13px}
.topic-row p{font-size:.9rem;color:var(--muted);max-width:670px;line-height:1.8;margin:0 0 10px}
.topic-row .story__meta{margin-bottom:10px}
.side-panel{padding:27px 25px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);position:sticky;top:24px}
.side-panel h2{font-size:1.16rem;margin-bottom:22px}
.side-panel ol{list-style:none;counter-reset:check;padding:0;margin:0 0 23px}
.side-panel li{display:flex;flex-direction:column;gap:4px;padding:0 0 17px 30px;margin:0 0 18px;counter-increment:check;border-bottom:1px solid var(--line);position:relative}
.side-panel li::before{content:counter(check);position:absolute;left:0;top:0;color:var(--green);font-weight:800;font-variant-numeric:tabular-nums}
.side-panel li strong{font-size:.84rem;color:var(--deep)}
.side-panel li span{font-size:.78rem;color:var(--muted);line-height:1.7}
.side-panel>a{color:var(--green-dark);font-weight:760;font-size:.82rem}
/* article */
.article-shell{padding-bottom:92px}
.article-detail{padding-top:31px}
.article-head{max-width:880px;margin:0 auto 48px;padding:0 0 35px;border-bottom:1px solid var(--line-strong)}
.article-head .eyebrow{margin-bottom:17px}
.article-head h1{font-size:clamp(1.8rem,3.4vw,2.8rem);margin-bottom:23px}
.article-deck{font-size:1.06rem;line-height:1.95;color:var(--muted);max-width:770px;margin:0}
.article-body{display:grid;grid-template-columns:minmax(0,720px) minmax(200px,270px);gap:80px;justify-content:space-between;margin:auto;max-width:1100px;align-items:start}
.article-content{min-width:0}
.article-content section{padding:0 0 30px;margin-bottom:34px;border-bottom:1px solid var(--line)}
.article-content section:last-of-type{border-bottom:0;margin-bottom:10px}
.article-content h2{font-size:1.32rem;margin-bottom:20px;padding-left:16px;border-left:3px solid var(--green)}
.article-content p{font-size:1.025rem;line-height:2.15;margin:0;color:var(--ink);letter-spacing:.008em}
.reading-note{margin-top:25px;padding:19px 24px;background:var(--panel);border-radius:var(--radius);color:var(--muted);font-size:.85rem;line-height:1.85;border-left:3px solid var(--mint)}
.article-aside{position:sticky;top:26px}
.aside-card{border:1px solid var(--line);border-radius:var(--radius);padding:25px 20px;background:white}
.aside-card h2{font-size:1.13rem;margin:0 0 17px;padding-bottom:13px;border-bottom:2px solid var(--mint)}
.aside-card a{display:flex;flex-direction:column;gap:6px;padding:14px 0;border-bottom:1px solid var(--line)}
.aside-card a:last-child{border-bottom:0;padding-bottom:0}
.aside-card span{font-size:.72rem;color:var(--green)}
.aside-card strong{font-size:.85rem;line-height:1.55;color:var(--deep)}
.aside-card a:hover strong{color:var(--green-dark)}
.aside-return{display:inline-block;color:var(--green-dark);font-size:.83rem;font-weight:770;margin:19px 0}
.error-page{min-height:50vh;padding:90px 0 120px}
.error-page h1{margin-bottom:17px}
.error-page>p:not(.eyebrow){color:var(--muted)}
.error-page .text-link{margin-top:12px}
/* image and flow safeguarding */
.story__media img,.brand img{color:transparent}
.story,.topic-row,.aside-card,.lead__compact{overflow-wrap:break-word}
@media (min-width:1200px){
 .lead__stories .story--feature .story__media{aspect-ratio:1.8}
 .lead__intro h1{line-height:1.29}
 .lead__compact .story__body{padding-right:5px}
 .side-panel{margin-top:4px}
}
@media (max-width:1050px){
 .lead{gap:35px;grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr)}
 .lead__intro h1{font-size:2.12rem}
 .split{gap:42px}
 .topic-layout{gap:34px;grid-template-columns:minmax(0,1fr) 245px}
 .article-body{gap:40px}
 .feed__grid{gap:16px}
 .brand-info{gap:32px}
}
@media (max-width:800px){
 .shell{width:min(var(--shell),calc(100% - 38px))}
 .header-row{gap:14px;min-height:77px}
 .main-nav{gap:18px;font-size:.84rem}
 .lead{grid-template-columns:1fr;padding:42px 0 47px;gap:36px}
 .lead__intro{padding-top:16px}
 .lead__intro h1{max-width:20ch;font-size:clamp(1.85rem,5vw,2.5rem)}
 .lead__desc{max-width:710px}
 .lead__stories{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.9fr);column-gap:20px;align-items:start}
 .section-kicker{grid-column:1/-1}
 .lead__compact{display:flex;flex-direction:column;margin:0;padding:0;border:0;gap:21px}
 .lead__compact .story+.story{padding-top:16px;border-top:1px solid var(--line)}
 .feed{padding:45px 0}
 .feed__grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
 .feed__grid .story:last-child{grid-column:1/-1;display:grid;grid-template-columns:38% 1fr;align-items:start}
 .feed__grid .story:last-child .story__media{aspect-ratio:1.6}
 .split{grid-template-columns:1fr;gap:15px;padding:46px 0}
 .split__title{padding:0 0 12px}
 .split__title h2{max-width:none}
 .split__list .story{padding:21px 0}
 .mini-feed{padding:46px 0}
 .brand-info{margin:39px 0 54px}
 .topic-layout{grid-template-columns:1fr}
 .side-panel{position:static;max-width:100%;margin-top:4px}
 .side-panel ol{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}
 .side-panel li{margin:0}
 .article-body{grid-template-columns:1fr}
 .article-aside{position:static;display:block}
 .aside-card{max-width:none}
 .aside-card a{display:inline-flex;vertical-align:top;width:31%;margin-right:2%;border:none}
 .aside-card a:last-child{margin-right:0}
 .article-head{margin-bottom:38px}
}
@media (max-width:590px){
 :root{--radius:6px}
 body{font-size:15px}
 .shell{width:calc(100% - 32px)}
 .header-row{align-items:start;flex-direction:column;gap:4px;padding-top:15px;padding-bottom:0}
 .brand img{width:37px;height:37px}
 .brand strong{font-size:1.3rem}
 .brand small{font-size:.62rem}
 .main-nav{width:100%;overflow:auto;white-space:nowrap;flex-wrap:nowrap;gap:26px;-webkit-overflow-scrolling:touch}
 .main-nav a{min-height:47px;font-size:.84rem;padding-top:14px;padding-bottom:11px}
 .topline{font-size:.67rem;min-height:45px;letter-spacing:0}
 .topline__right{font-size:.65rem}
 .eyebrow{font-size:.69rem;margin-bottom:10px}
 .lead{padding:35px 0 39px;gap:32px}
 .lead__intro h1{font-size:1.86rem;line-height:1.33;margin-bottom:17px;max-width:none}
 .lead__desc{line-height:1.86;font-size:.91rem;margin-bottom:15px}
 .lead__stories{display:block}
 .section-kicker{padding-bottom:10px;margin-bottom:17px}
 .lead__compact{display:grid;grid-template-columns:1fr;gap:14px;padding-top:19px;margin-top:19px;border-top:1px solid var(--line)}
 .lead__compact .story+.story{padding-top:14px}
 .lead__compact .story p{font-size:.81rem}
 .story--feature .story__media{margin-bottom:14px}
 .story__meta{gap:9px;margin-bottom:10px}
 .story h3{font-size:1.09rem}
 .story p{font-size:.84rem;line-height:1.74}
 .feed{padding:38px 0 42px}
 .section-heading{display:block;margin-bottom:21px}
 .section-heading h2{font-size:1.47rem}
 .section-heading>p{margin:10px 0 0;max-width:none;line-height:1.75}
 .feed__grid{display:block}
 .feed__grid .story{display:grid;grid-template-columns:37% 1fr;gap:15px;border-bottom:1px solid var(--line);padding:17px 0}
 .feed__grid .story:first-child{padding-top:0}
 .feed__grid .story:last-child{display:grid;grid-template-columns:37% 1fr;padding-bottom:0;border:0}
 .feed__grid .story--feature .story__media{aspect-ratio:1.05;margin:0}
 .feed__grid .story__body{display:block}
 .feed__grid .story h3{font-size:1rem;line-height:1.48;margin-bottom:8px}
 .feed__grid .story p{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden;font-size:.78rem}
 .feed__grid .story__link{padding-top:0;margin-top:8px}
 .split{padding:38px 0 44px;gap:10px}
 .split__title{padding:0}
 .split__title h2{font-size:1.48rem;margin-bottom:11px}
 .split__title>p:not(.eyebrow){font-size:.86rem;margin-bottom:13px}
 .split__list .story{padding:18px 0}
 .mini-feed{padding:38px 0 44px}
 .mini-feed__items{grid-template-columns:1fr;gap:23px}
 .mini-feed__items .story{padding-top:16px}
 .brand-info{display:block;padding:22px;margin:30px 0 46px}
 .brand-info h2{font-size:1.25rem}
 .brand-info p{font-size:.84rem}
 .brand-info__note{padding:14px 0 0;border-left:0;border-top:1px solid var(--line-strong);max-width:none;margin-top:16px}
 .site-footer{padding:40px 0 19px}
 .footer-grid{display:block;padding-bottom:31px}
 .footer-grid p{font-size:.82rem}
 .footer-grid nav{gap:14px 21px;margin-top:26px}
 .footer-bottom{font-size:.67rem;display:block}
 .footer-bottom span{display:block;margin-top:5px}
 .crumb{min-height:59px;font-size:.73rem;gap:6px}
 .inner-main{padding-bottom:47px}
 .inner-hero{padding:23px 0 35px}
 .inner-hero h1{font-size:1.88rem;margin-bottom:13px}
 .inner-hero>p:last-child{font-size:.9rem;line-height:1.86}
 .topic-layout{padding-top:32px;gap:28px}
 .group-heading{font-size:1.16rem}
 .topic-row{grid-template-columns:33px 1fr;gap:9px;padding:22px 0}
 .topic-row__number{font-size:.85rem;padding-top:3px}
 .topic-row h3{font-size:1.08rem}
 .topic-row p{font-size:.83rem}
 .side-panel{padding:20px}
 .side-panel ol{grid-template-columns:1fr;gap:10px}
 .side-panel li{padding-bottom:13px}
 .article-shell{padding-bottom:60px}
 .article-detail{padding-top:18px}
 .article-head{margin-bottom:31px;padding-bottom:28px}
 .article-head h1{font-size:1.83rem;line-height:1.4;margin-bottom:18px}
 .article-deck{font-size:.94rem;line-height:1.87}
 .article-content section{margin-bottom:24px;padding-bottom:22px}
 .article-content h2{font-size:1.17rem;margin-bottom:14px;padding-left:11px}
 .article-content p{font-size:.96rem;line-height:2.05}
 .reading-note{padding:15px 17px;font-size:.81rem}
 .aside-card{padding:20px}
 .aside-card a{display:flex;width:100%;padding:14px 0;margin:0;border-bottom:1px solid var(--line)}
 .error-page{min-height:48vh;padding:80px 0}
}
@media (max-width:360px){
 .shell{width:calc(100% - 24px)}
 .main-nav{gap:20px}
 .topline__right{display:none}
 .lead__intro h1{font-size:1.7rem}
 .feed__grid .story{grid-template-columns:1fr}
 .feed__grid .story:last-child{grid-template-columns:1fr}
 .feed__grid .story--feature .story__media{aspect-ratio:1.8}
 .feed__grid .story p{display:block}
 .topic-row{grid-template-columns:1fr}
 .topic-row__number{font-size:.74rem}
}
@media (prefers-reduced-motion:reduce){
 *,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;transition-duration:.01ms!important}
 .story__media:hover img{transform:none}
}
@media print{
 body{background:white;color:black;font-size:11pt}
 body::before,.site-header,.site-footer,.article-aside,.skip{display:none!important}
 .shell{width:100%;max-width:none}
 a{color:inherit;text-decoration:underline}
 .article-body{display:block}
 .article-content section{break-inside:avoid}
 .article-head{max-width:none}
 .crumb{min-height:auto;margin:0 0 18px}
 .article-shell{padding:0}
}