/* 51吃瓜 — dark editorial information layout */
:root{
  --brand:#C84A5A;
  --copper:#D08A48;
  --ink:#121214;
  --bg:#17171A;
  --panel:#222226;
  --panel-2:#29292E;
  --text:#F1EEEE;
  --muted:#A9A3A6;
  --accent:#E59A3A;
  --line:#37373D;
  --good:#8DBB9C;
  --warn:#D5AA72;
  --max:1180px;
  --read:780px;
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;line-height:1.75;letter-spacing:.01em}
body.modal-open{overflow:hidden}
a{color:inherit;text-decoration:none}
a:hover{color:#fff}
img{max-width:100%;height:auto;display:block}
button,input{font:inherit}
button{cursor:pointer}
.wrap{width:min(calc(100% - 40px),var(--max));margin-inline:auto}
.read-wrap{width:min(calc(100% - 40px),var(--read));margin-inline:auto}
.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}
.skip-link{position:fixed;z-index:9999;left:12px;top:-60px;background:#fff;color:#111;padding:10px 14px;border-radius:8px}
.skip-link:focus{top:12px}
.site-header{position:sticky;top:0;z-index:80;background:rgba(18,18,20,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,255,255,.07)}
.header-inner{min-height:78px;display:flex;align-items:center;gap:24px}
.brand-mark{display:flex;align-items:center;gap:12px;min-width:max-content}
.brand-mark img{width:46px;height:46px;object-fit:contain;border-radius:12px;background:var(--panel)}
.brand-mark span{display:flex;flex-direction:column;line-height:1.2}
.brand-mark strong{font-size:18px;letter-spacing:.06em}
.brand-mark small{color:var(--muted);font-size:11px;margin-top:5px}
.desktop-nav{margin-left:auto;display:flex;align-items:center;gap:8px}
.desktop-nav a{padding:10px 12px;border-radius:10px;color:#d7d1d3;font-size:14px}
.desktop-nav a:hover,.desktop-nav a[aria-current="page"]{background:var(--panel);color:#fff}
.header-actions{display:flex;gap:8px}
.icon-button,.menu-button{width:42px;height:42px;border:1px solid var(--line);background:var(--panel);color:#fff;border-radius:12px}
.icon-button{font-size:24px;line-height:1}
.menu-button{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px}
.menu-button span{width:18px;height:2px;background:#fff;border-radius:2px}
.mobile-menu{position:absolute;left:0;right:0;top:78px;background:#18181c;border-bottom:1px solid var(--line);padding:12px 20px 20px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.mobile-menu[hidden]{display:none!important}
.mobile-menu a{padding:12px;background:var(--panel);border-radius:10px;color:#ddd6d8}
.search-modal[hidden]{display:none!important}
.search-modal{position:fixed;inset:0;z-index:200;background:rgba(8,8,9,.82);display:grid;place-items:start center;padding:12vh 20px 40px}
.search-panel{position:relative;width:min(680px,100%);background:#202024;border:1px solid #3a3a40;border-radius:24px;padding:34px;box-shadow:0 25px 70px rgba(0,0,0,.45)}
.search-panel h2{margin:.2em 0;font-size:clamp(28px,4vw,42px);line-height:1.2}
.search-panel p{color:var(--muted)}
.search-close{position:absolute;right:16px;top:14px;width:40px;height:40px;border:0;border-radius:50%;background:#303036;color:#fff;font-size:25px}
.search-form{display:flex;gap:10px;margin-top:24px}
.search-form input{flex:1;min-width:0;background:#161618;color:#fff;border:1px solid #44444a;border-radius:12px;padding:13px 14px;outline:none}
.search-form input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(229,154,58,.12)}
.search-form button,.button{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:12px;background:var(--accent);color:#1d1308;font-weight:800;padding:12px 18px}
.button.secondary{background:transparent;color:#fff;border:1px solid #4c4c54}
.button.ghost{background:var(--panel);color:#f3edef;border:1px solid var(--line)}
main{min-height:60vh}
.eyebrow{text-transform:uppercase;letter-spacing:.16em;font-size:12px;font-weight:800;color:var(--copper);margin:0 0 10px}
.hero-home{padding:54px 0 34px}
.hero-shell{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(320px,.8fr);gap:34px;align-items:stretch}
.hero-copy{padding:38px 0 26px}
.hero-copy h1{margin:0;max-width:780px;font-size:clamp(38px,6.2vw,72px);line-height:1.06;letter-spacing:-.04em}
.hero-copy .lead{max-width:720px;font-size:18px;color:#cbc4c6;margin:24px 0 0}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.hero-domain{margin-top:28px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;color:var(--muted);font-size:14px}
.domain-chip{display:inline-flex;align-items:center;gap:8px;background:#212126;border:1px solid #3a3a40;border-radius:999px;padding:7px 11px;color:#f6edef;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}
.copy-domain{border:0;background:transparent;color:var(--accent);padding:4px 2px}
.hero-visual{position:relative;min-height:430px;border-radius:28px;overflow:hidden;background:var(--panel)}
.hero-visual img{width:100%;height:100%;object-fit:cover;opacity:.78}
.hero-visual:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 35%,rgba(18,18,20,.88))}
.hero-caption{position:absolute;z-index:2;left:24px;right:24px;bottom:22px}
.hero-caption strong{display:block;font-size:20px}
.hero-caption span{color:#ccc4c6;font-size:14px}
.section{padding:58px 0;border-top:1px solid rgba(255,255,255,.055)}
.section.compact{padding:38px 0}
.section-soft{background:#1a1a1e}
.section-panel{background:var(--panel)}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:26px}
.section-head h2{font-size:clamp(26px,4vw,42px);line-height:1.15;margin:0;max-width:740px;letter-spacing:-.02em}
.section-head p{margin:0;max-width:540px;color:var(--muted)}
.link-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.link-list li{border-bottom:1px solid var(--line)}
.link-list a{display:grid;grid-template-columns:minmax(180px,.7fr) minmax(0,1.3fr);gap:30px;padding:20px 4px;align-items:baseline}
.link-list a:hover strong{color:var(--accent)}
.link-list strong{font-size:18px}
.link-list span{color:var(--muted)}
.priority-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px}
.priority-main{background:var(--panel);border-radius:22px;padding:30px}
.priority-main h3{font-size:30px;line-height:1.2;margin:0 0 12px}
.priority-main p{color:#c4bdc0}
.priority-main img{margin-top:24px;width:100%;height:260px;object-fit:cover;border-radius:16px}
.priority-side{display:grid;gap:14px}
.priority-item{padding:22px;border:1px solid var(--line);border-radius:18px;background:#1b1b1f}
.priority-item b{display:block;color:var(--copper);font-size:12px;letter-spacing:.12em;margin-bottom:8px}
.priority-item h3{margin:0 0 8px;font-size:20px}
.priority-item p{margin:0;color:var(--muted)}
.check-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;counter-reset:check}
.check-item{position:relative;padding:26px 24px;background:var(--panel);border-radius:18px;min-height:200px}
.check-item:before{counter-increment:check;content:"0" counter(check);display:block;color:var(--brand);font-weight:900;font-size:13px;letter-spacing:.15em;margin-bottom:22px}
.check-item h3{margin:0 0 10px;font-size:20px}
.check-item p{margin:0;color:var(--muted)}
.split-feature{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:38px;align-items:center}
.split-feature.reverse{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr)}
.split-feature.reverse .split-image{order:2}
.split-image{border-radius:24px;overflow:hidden;background:var(--panel);min-height:360px}
.split-image img{width:100%;height:100%;min-height:360px;object-fit:cover}
.split-copy h2{margin:.15em 0 .4em;font-size:clamp(29px,4.2vw,46px);line-height:1.15}
.split-copy p{color:#c7c0c2}
.bullet-lines{list-style:none;padding:0;margin:24px 0 0}
.bullet-lines li{padding:12px 0 12px 24px;border-bottom:1px solid var(--line);position:relative;color:#d7d0d2}
.bullet-lines li:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--accent);position:absolute;left:2px;top:21px}
.micro-nav{display:flex;flex-wrap:wrap;gap:8px}
.micro-nav a{border:1px solid var(--line);background:#1e1e22;padding:9px 12px;border-radius:999px;color:#ccc5c7;font-size:14px}
.micro-nav a:hover{border-color:var(--copper);color:#fff}
.note-strip{display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:start;padding:22px 0;border-top:1px solid var(--line)}
.note-strip:last-child{border-bottom:1px solid var(--line)}
.note-strip b{color:var(--brand);letter-spacing:.08em;white-space:nowrap}
.note-strip p{margin:0;color:#c7c0c2}
.status-line{display:grid;grid-template-columns:140px 1fr;gap:18px;padding:16px 0;border-bottom:1px solid var(--line)}
.status-line span{font-size:13px;font-weight:800;color:var(--copper);letter-spacing:.08em}
.status-line p{margin:0;color:#c9c2c4}
.status-good span{color:var(--good)}
.status-warn span{color:var(--warn)}
.callout{margin:28px 0;padding:22px 24px;border-left:3px solid var(--accent);background:#202024;border-radius:0 14px 14px 0}
.callout strong{font-size:18px}
.callout p{margin:6px 0 0;color:#c7c0c2}
.page-hero{padding:46px 0 30px}
.page-hero-grid{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:34px;align-items:center}
.page-hero h1{font-size:clamp(38px,5.5vw,62px);line-height:1.08;letter-spacing:-.035em;margin:0 0 18px}
.page-hero .lead{font-size:18px;color:#c7c0c2;max-width:760px}
.page-hero-media{height:250px;border-radius:22px;overflow:hidden;background:var(--panel)}
.page-hero-media img{width:100%;height:100%;object-fit:cover}
.breadcrumb{padding-top:24px}
.breadcrumb ol{list-style:none;display:flex;gap:10px;flex-wrap:wrap;margin:0;padding:0;color:var(--muted);font-size:13px}
.breadcrumb li:not(:last-child):after{content:"/";margin-left:10px;color:#66636a}
.breadcrumb a:hover{color:#fff}
.reading-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:46px;align-items:start}
.prose{font-size:17px;color:#d7d0d2}
.prose h2{font-size:30px;line-height:1.25;color:#fff;margin:2em 0 .7em}
.prose h3{font-size:21px;color:#fff;margin:1.7em 0 .5em}
.prose p{margin:0 0 1.2em}
.prose ul,.prose ol{padding-left:1.4em}
.prose li{margin:.55em 0}
.prose a{color:#f0b76d;text-decoration:underline;text-underline-offset:3px}
.prose figure{margin:32px 0}
.prose figure img{border-radius:18px}
.prose figcaption{font-size:13px;color:var(--muted);margin-top:8px}
.side-index{position:sticky;top:104px;padding:22px;background:var(--panel);border-radius:18px}
.side-index h2{font-size:15px;margin:0 0 12px;color:#f1e9eb}
.side-index ul{list-style:none;margin:0;padding:0}
.side-index a{display:block;padding:9px 0;color:var(--muted);font-size:14px;border-bottom:1px solid #34343a}
.side-index a:hover{color:#fff}
.step-list{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:20px;overflow:hidden}
.step-row{display:grid;grid-template-columns:72px 240px 1fr;gap:22px;padding:24px;background:var(--panel);align-items:start}
.step-row .num{font-weight:900;font-size:24px;color:var(--brand)}
.step-row h3{margin:0;font-size:20px}
.step-row p{margin:0;color:var(--muted)}
.route-list{position:relative;margin-top:26px}
.route-item{display:grid;grid-template-columns:30px 1fr auto;gap:16px;align-items:start;padding:20px 0;border-bottom:1px solid var(--line)}
.route-dot{width:14px;height:14px;border:3px solid var(--copper);border-radius:50%;margin-top:7px}
.route-item h3{margin:0 0 4px;font-size:20px}
.route-item p{margin:0;color:var(--muted)}
.route-item a{color:var(--accent);font-weight:700;font-size:14px;padding-top:4px}
.faq-list{display:grid;gap:10px}
.faq-item{border:1px solid var(--line);background:var(--panel);border-radius:14px;overflow:hidden}
.faq-question{width:100%;display:flex;justify-content:space-between;gap:20px;text-align:left;background:transparent;border:0;color:#fff;padding:18px 20px;font-weight:760}
.faq-question span:last-child{color:var(--accent);font-size:22px;font-weight:400}
.faq-answer{padding:0 20px 20px;color:#c5bec0}
.faq-answer[hidden]{display:none}
.search-results{display:grid;gap:12px}
.search-result{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:18px;padding:22px;border:1px solid var(--line);border-radius:16px;background:var(--panel)}
.search-result h2{font-size:20px;margin:0 0 7px}
.search-result p{margin:0;color:var(--muted)}
.search-result a:last-child{color:var(--accent);font-weight:800;white-space:nowrap;align-self:center}
.empty-state{padding:38px;border:1px dashed #4c4c53;border-radius:18px;text-align:center;color:var(--muted)}
.info-table{width:100%;border-collapse:collapse;margin:24px 0}
.info-table th,.info-table td{border-bottom:1px solid var(--line);padding:14px 10px;text-align:left;vertical-align:top}
.info-table th{width:190px;color:#fff}
.info-table td{color:#bfb8ba}
.dos-donts{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.dos-donts>div{border:1px solid var(--line);border-radius:18px;padding:24px;background:var(--panel)}
.dos-donts h3{margin-top:0}
.dos-donts ul{padding-left:20px;color:#c5bec0}
.statement-band{padding:34px;border:1px solid #4d3b30;background:linear-gradient(90deg,rgba(208,138,72,.13),rgba(200,74,90,.08));border-radius:24px}
.statement-band h2{margin:0 0 8px;font-size:30px}
.statement-band p{margin:0;color:#d4cbcd;max-width:850px}
.image-pair{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.image-pair img{width:100%;height:290px;object-fit:cover;border-radius:18px}
.footer-prelude{padding:50px 0}
.footer-prelude .inner{display:flex;align-items:center;justify-content:space-between;gap:30px;border-top:1px solid var(--line);padding-top:34px}
.footer-prelude h2{font-size:28px;margin:0}
.footer-prelude p{margin:6px 0 0;color:var(--muted)}
.site-footer{border-top:1px solid var(--line);background:var(--ink);padding:48px 0 22px}
.footer-grid{display:grid;grid-template-columns:1.45fr repeat(3,1fr);gap:36px}
.footer-brand{font-size:26px;font-weight:900;letter-spacing:.06em}
.footer-intro p{color:var(--muted);max-width:430px}
.footer-domain{font-size:13px}
.footer-group h2{font-size:14px;margin:0 0 14px;color:#eee7e9}
.footer-group ul{list-style:none;margin:0;padding:0}
.footer-group li{margin:8px 0}
.footer-group a{color:var(--muted);font-size:14px}
.footer-group a:hover{color:#fff}
.footer-bottom{border-top:1px solid #2d2d32;margin-top:34px;padding-top:18px;display:flex;justify-content:space-between;gap:20px;color:#77737a;font-size:12px}
.back-top{position:fixed;right:20px;bottom:20px;z-index:70;width:46px;height:46px;border:1px solid #4a4a50;border-radius:50%;background:#242429;color:#fff;box-shadow:0 8px 25px rgba(0,0,0,.24)}
.back-top[hidden]{display:none}
@media (max-width:1024px){
  .desktop-nav{display:none}.menu-button{display:flex}
  .hero-shell,.page-hero-grid{grid-template-columns:1fr}
  .hero-visual{min-height:340px}.page-hero-media{height:300px}
  .reading-layout{grid-template-columns:1fr}.side-index{position:static}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr}.footer-group:last-child{grid-column:2/4}
}
@media (max-width:768px){
  .wrap,.read-wrap{width:min(calc(100% - 28px),var(--max))}
  .header-inner{min-height:68px}.mobile-menu{top:68px}
  .brand-mark small{display:none}.brand-mark img{width:40px;height:40px}
  .hero-home{padding-top:34px}.hero-copy{padding-top:16px}
  .section{padding:44px 0}.section-head{align-items:start;flex-direction:column}
  .priority-grid,.split-feature,.split-feature.reverse,.check-grid,.dos-donts{grid-template-columns:1fr}
  .split-feature.reverse .split-image{order:0}
  .split-image,.split-image img{min-height:260px}
  .link-list a{grid-template-columns:1fr;gap:6px}
  .step-row{grid-template-columns:52px 1fr}.step-row p{grid-column:2}
  .route-item{grid-template-columns:26px 1fr}.route-item>a{grid-column:2;padding-top:0}
  .footer-grid{grid-template-columns:1fr 1fr}.footer-intro{grid-column:1/-1}.footer-group:last-child{grid-column:auto}
  .footer-prelude .inner,.footer-bottom{align-items:flex-start;flex-direction:column}
  .search-form{flex-direction:column}.search-panel{padding:30px 22px}.image-pair{grid-template-columns:1fr}.image-pair img{height:230px}
}
@media (max-width:600px){
  .hero-copy h1{font-size:42px}.hero-visual{min-height:280px}.hero-caption{left:18px;right:18px}
  .page-hero h1{font-size:40px}.page-hero-media{height:220px}
  .mobile-menu{grid-template-columns:1fr}
  .status-line{grid-template-columns:1fr;gap:5px}
  .search-result{grid-template-columns:1fr}.search-result a:last-child{justify-self:start}
  .info-table,.info-table tbody,.info-table tr,.info-table th,.info-table td{display:block;width:100%}.info-table th{padding-bottom:2px;border-bottom:0}.info-table td{padding-top:2px}
  .footer-grid{grid-template-columns:1fr}.footer-group:last-child{grid-column:auto}
}
@media (max-width:375px){
  .wrap,.read-wrap{width:min(calc(100% - 22px),var(--max))}.hero-copy h1{font-size:36px}.hero-actions .button{width:100%}.header-inner{gap:12px}.brand-mark strong{font-size:16px}.icon-button,.menu-button{width:39px;height:39px}.section{padding:38px 0}
}