/* roulang page: index */
:root{--blue:#1764e8;--blue-dark:#1048af;--sky:#eaf2ff;--ink:#142641;--muted:#63738b;--line:#e1e9f3;--paper:#fff;--bg:#f5f8fc;--green:#16826e;--radius:20px;--shadow:0 12px 36px rgba(26,64,117,.07);--width:1180px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;line-height:1.75}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,a,input,select{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button,input,select{border-radius:10px}img{display:block;width:100%;object-fit:cover}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.3}h2{font-size:clamp(25px,3vw,35px);letter-spacing:-.7px}h3{font-size:19px}p{color:var(--muted)}a,button{transition:color .2s,background .2s,transform .2s,box-shadow .2s}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #8cb8ff;outline-offset:4px}a:hover{color:var(--blue)}button:active,.btn:active{transform:translateY(1px)}.container{width:min(var(--width),calc(100% - 48px));margin:auto}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(16px)}.header-inner{height:84px;display:flex;align-items:center;gap:32px}.logo{display:flex;gap:11px;align-items:center;flex-shrink:0}.logo-mark{width:41px;height:41px;border-radius:12px;background:var(--blue);color:white;display:grid;place-items:center;font-weight:900;font-size:22px;box-shadow:0 5px 12px #1764e82b}.logo strong{font-size:22px;letter-spacing:-1px}.logo small{display:block;font-size:10px;letter-spacing:3px;color:var(--muted);line-height:1.2}.nav{display:flex;gap:26px;align-items:center}.nav a{font-size:14px;font-weight:600;padding:28px 0;border-bottom:3px solid transparent}.nav a.active{color:var(--blue);border-color:var(--blue)}.header-tools{margin-left:auto;display:flex;gap:12px;align-items:center}.search{display:flex;align-items:center;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:7px 11px;gap:8px}.search input{border:0;background:transparent;width:132px;min-width:0;outline:0;font-size:13px}.search button{border:0;background:none;color:var(--muted);padding:0 3px}.btn{display:inline-flex;justify-content:center;align-items:center;gap:8px;padding:12px 23px;border:1px solid transparent;border-radius:11px;font-weight:650;font-size:14px;background:var(--blue);color:white}.btn:hover{background:var(--blue-dark);color:white;box-shadow:0 6px 18px #1764e82a;transform:translateY(-2px)}.btn.secondary{background:white;border-color:var(--line);color:var(--ink)}.btn.secondary:hover{border-color:var(--blue);color:var(--blue)}.header-tools>.btn{padding:9px 16px}.menu-toggle{display:none;border:1px solid var(--line);background:white;padding:7px 12px}.section{padding:76px 0}.soft{background:var(--bg)}.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:48px;margin-bottom:30px}.section-head p{max-width:630px;font-size:14px;margin-top:16px}.eyebrow{display:block;color:var(--blue);font-size:12px;letter-spacing:2px;font-weight:750;margin-bottom:12px}.tag{display:inline-flex;align-items:center;background:var(--sky);color:var(--blue);padding:4px 10px;border-radius:6px;font-size:12px;font-weight:600}.muted{color:var(--muted)}.hero{padding:58px 0 36px;position:relative;overflow:hidden;background:#f1f6ff}.hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(241,246,255,.98),rgba(241,246,255,.91)),url('/assets/images/64439c943f301c4b.png') center/cover;pointer-events:none}.hero .container{position:relative}.hero-intro{max-width:900px;margin:0 auto;text-align:center}.hero h1{font-size:clamp(31px,4.5vw,54px);font-weight:850;letter-spacing:-2px;margin-bottom:20px}.hero h1 span{color:var(--blue)}.hero-intro p{font-size:15px;line-height:1.95;max-width:810px;margin:auto}.coupon-wall{display:grid;grid-template-columns:1.6fr 1fr;gap:20px;max-width:1000px;margin:32px auto 24px}.main-coupon{background:var(--blue);border-radius:var(--radius);padding:30px 36px;color:white;display:flex;align-items:center;gap:30px;box-shadow:0 16px 35px #1764e825;position:relative}.main-coupon:after{content:"";position:absolute;right:31%;top:18px;bottom:18px;border-right:1px dashed #ffffff59}.coupon-value{font-size:62px;font-weight:850;line-height:1;letter-spacing:-4px}.coupon-value small{font-size:17px;letter-spacing:0;display:block;margin-top:12px;font-weight:500}.coupon-copy{flex:1}.coupon-copy h2{font-size:25px}.coupon-copy p{color:#dce9ff;font-size:13px;margin:9px 0 18px}.main-coupon .btn{background:white;color:var(--blue);padding:10px 19px}.mini-coupons{display:grid;gap:12px}.mini-coupon{display:flex;gap:18px;background:white;border:1px solid #dce7f8;border-radius:16px;padding:19px 22px;align-items:center}.ticket-no{font-size:24px;font-weight:800;color:var(--blue);min-width:43px}.mini-coupon h3{font-size:16px}.mini-coupon p{font-size:12px;margin-top:4px}.hero-note{text-align:center;font-size:12px;color:var(--muted)}.metrics{display:grid;grid-template-columns:repeat(4,1fr);margin-top:35px;border-top:1px solid #d9e4f4;padding-top:23px;gap:20px}.metric{text-align:center}.metric b{font-size:24px;display:block;color:var(--ink);line-height:1.3}.metric span{font-size:12px;color:var(--muted)}.calendar{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:white;box-shadow:var(--shadow)}.calendar-item{padding:25px;border-right:1px solid var(--line)}.calendar-item:last-child{border:0}.calendar-item b{display:block;font-size:13px;color:var(--blue);margin-bottom:20px}.calendar-item h3{margin-bottom:12px}.calendar-item p{font-size:13px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.card{border:1px solid var(--line);border-radius:var(--radius);background:white;box-shadow:var(--shadow);overflow:hidden}.card:hover{border-color:#b7cef3}.topic{padding:28px}.topic-icon{width:49px;height:49px;background:var(--sky);border-radius:14px;display:grid;place-items:center;font-size:24px;margin-bottom:27px;color:var(--blue)}.topic p{font-size:14px;margin-top:13px}.channel{margin-top:24px;display:flex;align-items:center;justify-content:space-between;padding:20px 25px;background:var(--sky);border-radius:14px;gap:20px}.channel p{font-size:14px;color:#37577e}.channel a{font-weight:700;color:var(--blue);white-space:nowrap}.opinion-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:42px;align-items:center}.feature-img{height:340px;border-radius:var(--radius);background:#e8eff9}.opinion-text h2{margin:14px 0 19px}.opinion-text p{font-size:15px}.comparison{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin-top:25px}.compare-box{padding:19px;background:white;border:1px solid var(--line);border-radius:13px}.compare-box.good{border-color:#b9d2fb;background:#eff5ff}.compare-box h3{font-size:15px;margin-bottom:9px}.compare-box p{font-size:13px}.milestones{display:flex;gap:0;margin-top:32px;border-top:1px solid #cbdcf4;padding-top:20px}.milestones div{flex:1;font-size:12px;color:var(--muted);position:relative}.milestones div:before{content:"";position:absolute;top:-25px;width:9px;height:9px;background:var(--blue);border:3px solid white;border-radius:50%;box-sizing:content-box}.milestones b{display:block;color:var(--ink);font-size:14px}.news-layout{display:grid;grid-template-columns:1fr 300px;gap:30px}.news-list{border-top:1px solid var(--line)}.news-item{display:block;padding:23px 5px;border-bottom:1px solid var(--line)}.news-item:hover{background:var(--bg);padding-left:12px}.news-meta{display:flex;gap:13px;align-items:center;font-size:12px;color:var(--muted);margin-bottom:10px}.news-item h3{font-size:19px;margin-bottom:9px}.news-item p{font-size:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.news-side{background:var(--sky);border-radius:var(--radius);padding:28px;height:fit-content}.news-side h3{font-size:23px;margin:16px 0}.news-side p{font-size:14px}.plain-list{padding:0;list-style:none;margin:20px 0 0}.plain-list li{padding:11px 0;border-bottom:1px solid #cfdef2;font-size:13px;display:flex;justify-content:space-between;gap:12px}.plain-list li:last-child{border:0}.empty{padding:35px 20px;border:1px dashed var(--line);border-radius:14px;color:var(--muted);font-size:14px}.editor-grid{display:grid;grid-template-columns:1fr 1fr;gap:25px}.editor-card img{height:235px;transition:transform .4s}.editor-card:hover img{transform:scale(1.025)}.image-wrap{overflow:hidden}.editor-copy{padding:25px}.editor-copy h3{margin:12px 0}.editor-copy p{font-size:14px}.data-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}.data-copy p{margin-top:20px;font-size:14px}.chart{background:white;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius);padding:30px}.chart h3{font-size:17px;margin-bottom:26px}.bar-row{display:grid;grid-template-columns:65px 1fr 35px;align-items:center;gap:16px;margin:20px 0;font-size:13px}.bar-track{height:10px;border-radius:6px;background:#edf2fa;overflow:hidden}.bar{height:100%;border-radius:6px;background:var(--blue)}.bar.secondary{background:#5f99f2}.bar.third{background:#a7c8fa}.chart small{display:block;font-size:11px;color:var(--muted);border-top:1px solid var(--line);padding-top:16px;margin-top:25px}.assurance{padding:28px;background:var(--bg);border-radius:var(--radius);border:1px solid var(--line)}.assurance .number{font-size:12px;color:var(--blue);font-weight:700}.assurance h3{margin:19px 0 12px}.assurance p{font-size:14px}.quick-grid{display:grid;grid-template-columns:230px 1fr;gap:50px}.quick-grid>div>p{font-size:14px;margin-top:18px}.answers{display:grid;grid-template-columns:1fr 1fr;gap:20px}.answer{padding:25px;border-left:3px solid var(--blue);background:white;border-radius:0 14px 14px 0}.answer h3{font-size:16px;margin-bottom:12px}.answer p{font-size:13px}.faq-wrap{display:grid;grid-template-columns:1fr 1.5fr;gap:70px}.faq-wrap>div>p{margin-top:18px;font-size:14px}details{padding:20px 0;border-bottom:1px solid var(--line)}details:first-child{border-top:1px solid var(--line)}summary{list-style:none;cursor:pointer;font-weight:650;font-size:16px;display:flex;align-items:center;justify-content:space-between;gap:20px}summary::-webkit-details-marker{display:none}summary:after{content:"+";color:var(--blue);font-size:23px;font-weight:400}details[open] summary:after{content:"−"}details p{font-size:14px;margin-top:15px;padding-right:25px}.subscribe{padding:0 0 70px}.subscribe-panel{background:#153e7c;border-radius:24px;padding:42px;display:grid;grid-template-columns:1fr 1fr;gap:45px;color:white;align-items:center}.subscribe-panel h2{font-size:29px}.subscribe-panel p{color:#cad9f1;font-size:14px;margin-top:17px}.preference-form{background:white;border-radius:16px;padding:24px;color:var(--ink)}.preference-form label{font-size:13px;font-weight:600;display:block;margin-bottom:10px}.form-row{display:flex;gap:10px}.form-row select{min-width:0;flex:1;padding:11px;border:1px solid var(--line);background:var(--bg);color:var(--ink)}.preference-form small{font-size:11px;color:var(--muted);display:block;margin-top:12px}.form-status{font-size:12px;min-height:20px;margin-top:9px;color:var(--green)}.site-footer{border-top:1px solid var(--line);background:var(--bg);padding:45px 0 25px}.footer-top{display:flex;justify-content:space-between;gap:50px;padding-bottom:30px}.footer-brand{max-width:500px}.footer-brand p{font-size:13px;margin-top:16px}.footer-links{display:flex;gap:22px;align-items:flex-start;font-size:13px}.footer-bottom{border-top:1px solid var(--line);padding-top:22px;display:flex;justify-content:space-between;gap:20px;font-size:11px;color:var(--muted)}.search-status{font-size:13px;color:var(--blue);margin-bottom:16px}.hidden{display:none!important}
@media(min-width:1600px){.section{padding:88px 0}}
@media(max-width:1024px){.header-inner{gap:22px}.header-tools .search{display:none}.container{width:calc(100% - 40px)}.hero h1{font-size:43px}.main-coupon{padding:26px;gap:20px}.coupon-value{font-size:49px}.main-coupon:after{display:none}.calendar-item{padding:20px}.news-layout{grid-template-columns:1fr 260px}.data-grid{gap:30px}.faq-wrap{gap:35px}.subscribe-panel{gap:25px;padding:32px}.section{padding:60px 0}.topic{padding:22px}}
@media(max-width:768px){.header-inner{height:72px;gap:15px;flex-wrap:wrap}.header-tools{gap:8px}.header-tools>.btn{font-size:12px;padding:8px 12px}.menu-toggle{display:block}.nav{display:none;position:absolute;top:72px;left:0;right:0;background:white;padding:8px 24px 20px;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}.nav.open{display:flex}.nav a{padding:12px 0}.logo strong{font-size:19px}.logo-mark{width:35px;height:35px;font-size:19px}.hero{padding-top:40px}.hero h1{font-size:36px;letter-spacing:-1px}.hero-intro p{font-size:14px}.coupon-wall{grid-template-columns:1fr}.mini-coupons{grid-template-columns:1fr 1fr}.mini-coupon{padding:16px;gap:10px}.coupon-value{font-size:58px}.main-coupon:after{display:block;right:28%}.section-head{align-items:flex-start;gap:20px}.grid-3{grid-template-columns:1fr}.calendar{grid-template-columns:1fr 1fr}.calendar-item:nth-child(2){border-right:0}.calendar-item:nth-child(-n+2){border-bottom:1px solid var(--line)}.opinion-grid,.data-grid,.faq-wrap,.subscribe-panel,.quick-grid{grid-template-columns:1fr;gap:28px}.feature-img{height:300px}.news-layout{grid-template-columns:1fr}.news-side{display:none}.editor-card img{height:180px}.editor-copy{padding:19px}.editor-copy h3{font-size:17px}.channel{align-items:flex-start}.footer-top{flex-direction:column;gap:25px}.subscribe{padding-bottom:50px}.footer-bottom{flex-direction:column;gap:8px}.section{padding:48px 0}.subscribe-panel{padding:28px}.topic{display:grid;grid-template-columns:50px 1fr;column-gap:20px}.topic-icon{grid-row:1/3;margin:0}.topic p{margin-top:9px}.section-head p{max-width:none}.section-head>.btn{flex-shrink:0}}
@media(max-width:520px){.container{width:calc(100% - 32px)}.header-tools>.btn{display:none}.logo small{font-size:9px}.hero h1{font-size:31px}.hero-intro{text-align:left}.coupon-wall{margin-top:25px}.main-coupon{gap:18px;padding:24px 20px}.coupon-copy h2{font-size:20px}.coupon-value{font-size:43px;letter-spacing:-2px}.coupon-value small{font-size:13px}.main-coupon:after{display:none}.mini-coupons{grid-template-columns:1fr}.mini-coupon{padding:15px 20px}.metrics{grid-template-columns:1fr 1fr;gap:20px}.metric b{font-size:21px}.section-head{display:block}.section-head>.btn{margin-top:18px}.calendar-item{padding:19px 15px}.calendar-item h3{font-size:17px}.calendar-item p{font-size:12px}.channel{display:block}.channel a{display:inline-block;margin-top:10px}.comparison,.editor-grid,.answers{grid-template-columns:1fr}.feature-img{height:230px}.editor-card img{height:220px}.chart{padding:22px}.bar-row{gap:10px;grid-template-columns:60px 1fr 30px}.subscribe-panel{padding:25px 19px}.subscribe-panel h2{font-size:25px}.preference-form{padding:18px}.form-row{flex-direction:column}.form-row select{width:100%}.footer-links{flex-wrap:wrap}.hero-note{text-align:left}.milestones{gap:10px}.milestones b{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}

/* roulang page: article */
:root{--blue:#1764e8;--blue-dark:#1048af;--sky:#eaf2ff;--ink:#142641;--muted:#63738b;--line:#e1e9f3;--paper:#fff;--bg:#f5f8fc;--green:#16826e;--radius:20px;--shadow:0 12px 36px rgba(26,64,117,.07);--width:1180px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:105px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;line-height:1.75}
a{color:inherit;text-decoration:none}
button,input,select{font:inherit}
button,a,input,select{-webkit-tap-highlight-color:transparent}
button{cursor:pointer}
button,input,select{border-radius:10px}
img{display:block;width:100%;object-fit:cover}
a,button{transition:color .2s,background .2s,transform .2s,box-shadow .2s}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #8cb8ff;outline-offset:4px}
a:hover{color:var(--blue)}
button:active,.btn:active{transform:translateY(1px)}
.container{width:min(var(--width),calc(100% - 48px));margin:auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(16px)}
.header-inner{height:84px;display:flex;align-items:center;gap:32px}
.logo{display:flex;gap:11px;align-items:center;flex-shrink:0}
.logo-mark{width:41px;height:41px;border-radius:12px;background:var(--blue);color:white;display:grid;place-items:center;font-weight:900;font-size:22px;box-shadow:0 5px 12px #1764e82b}
.logo strong{font-size:22px;letter-spacing:-1px}
.logo small{display:block;font-size:10px;letter-spacing:3px;color:var(--muted);line-height:1.2}
.nav{display:flex;gap:26px;align-items:center}
.nav a{font-size:14px;font-weight:600;padding:28px 0;border-bottom:3px solid transparent}
.nav a.active{color:var(--blue);border-color:var(--blue)}
.header-tools{margin-left:auto;display:flex;gap:12px;align-items:center}
.search{display:flex;align-items:center;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:7px 11px;gap:8px}
.search input{border:0;background:transparent;width:132px;min-width:0;outline:0;font-size:13px;color:var(--ink)}
.search:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px var(--sky)}
.search button{border:0;background:none;color:var(--muted);padding:0 3px}
.btn{display:inline-flex;justify-content:center;align-items:center;gap:8px;padding:12px 23px;border:1px solid transparent;border-radius:11px;font-weight:650;font-size:14px;background:var(--blue);color:white}
.btn:hover{background:var(--blue-dark);color:white;box-shadow:0 6px 18px #1764e82a;transform:translateY(-2px)}
.btn.secondary{background:white;border-color:var(--line);color:var(--ink)}
.btn.secondary:hover{border-color:var(--blue);color:var(--blue)}
.header-tools>.btn{padding:9px 16px}
.menu-toggle{display:none;border:1px solid var(--line);background:white;padding:7px 12px;color:var(--ink)}
.section{padding:64px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:36px;margin-bottom:26px}
.section-head h2{margin:0;font-size:28px;letter-spacing:-.6px}
.section-head p{max-width:630px;font-size:14px;margin:12px 0 0;color:var(--muted)}
.eyebrow{display:block;color:var(--blue);font-size:12px;letter-spacing:2px;font-weight:750;margin-bottom:12px}
.tag{display:inline-flex;align-items:center;background:var(--sky);color:var(--blue);padding:4px 10px;border-radius:6px;font-size:12px;font-weight:600}
.muted{color:var(--muted)}
.card{border:1px solid var(--line);border-radius:var(--radius);background:white;box-shadow:var(--shadow);overflow:hidden}
.card:hover{border-color:#b7cef3}
h1,h2,h3,p,figure{margin-top:0}
h2,h3{line-height:1.5}
.hero{background:#f1f6ff;padding:35px 0 48px;border-bottom:1px solid var(--line)}
.breadcrumb{display:flex;gap:10px;align-items:center;color:var(--muted);font-size:12px;margin-bottom:33px;flex-wrap:wrap}
.breadcrumb span[aria-hidden]{color:#a4b2c5}
.article-intro{max-width:930px}
.article-intro h1{font-size:clamp(29px,4vw,46px);line-height:1.4;letter-spacing:-1.2px;margin:17px 0 23px;overflow-wrap:anywhere}
.article-description{max-width:900px;color:var(--muted);font-size:15px;line-height:1.95;margin-bottom:25px}
.meta{display:flex;flex-wrap:wrap;align-items:center;gap:12px 22px;font-size:12px;color:var(--muted)}
.meta strong{color:var(--ink);font-weight:600}
.cover-section{padding:32px 0 0;background:var(--paper)}
.cover-frame{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);background:var(--bg)}
.cover-frame img{height:clamp(230px,34vw,420px);object-position:center}
.cover-frame figcaption{padding:13px 22px;display:flex;justify-content:space-between;gap:20px;font-size:12px;color:var(--muted)}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 275px;gap:56px;align-items:start}
.article-prose{font-size:16px;line-height:1.95;overflow-wrap:anywhere;min-width:0}
.article-prose>:first-child{margin-top:0}
.article-prose h2{font-size:26px;margin:38px 0 20px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.article-prose h3{font-size:20px;margin:28px 0 16px}
.article-prose p{margin-bottom:23px}
.article-prose a{color:var(--blue);text-decoration:underline;text-underline-offset:4px}
.article-prose ul,.article-prose ol{padding-left:25px;margin:20px 0}
.article-prose li{margin:9px 0}
.article-prose li::marker{color:var(--blue)}
.article-prose img{max-width:100%;height:auto;border-radius:14px;margin:25px 0}
.article-prose blockquote{margin:28px 0;padding:20px 25px;background:var(--sky);border-left:4px solid var(--blue);border-radius:0 12px 12px 0}
.article-prose blockquote p:last-child{margin-bottom:0}
.article-prose table{display:block;max-width:100%;overflow-x:auto;border-collapse:collapse;font-size:14px;margin:24px 0}
.article-prose th,.article-prose td{border:1px solid var(--line);padding:12px 16px;text-align:left}
.article-prose th{background:var(--bg)}
.article-prose pre{overflow:auto;padding:18px;border-radius:12px;background:var(--bg);font-size:13px}
.article-sidebar{display:grid;gap:20px}
.side-card{padding:24px}
.side-card h2{font-size:17px;margin:0 0 12px}
.side-card p{font-size:13px;color:var(--muted);margin:0}
.side-card .tag{margin-bottom:16px}
.side-card ul{list-style:none;margin:15px 0 0;padding:0}
.side-card li{font-size:13px;padding:11px 0;border-top:1px solid var(--line);display:flex;align-items:center;gap:9px}
.side-card li:before{content:"";width:5px;height:5px;background:var(--blue);border-radius:50%;flex-shrink:0}
.side-note{background:var(--sky);border:1px solid #d5e4ff;box-shadow:none}
.empty-state{padding:55px 28px;text-align:center;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius)}
.empty-state h2{margin:0 0 20px;font-size:25px}
.quote-section{padding:0 0 58px}
.pull-quote{margin:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:30px 0;display:grid;grid-template-columns:80px 1fr;gap:22px;align-items:center}
.quote-mark{font-family:Georgia,serif;font-size:90px;color:var(--blue);height:80px;line-height:1.25}
.pull-quote p{font-size:clamp(21px,2.8vw,30px);line-height:1.6;margin:0;font-weight:650;letter-spacing:-.5px}
.pull-quote cite{display:block;font-size:12px;color:var(--muted);font-style:normal;margin-top:12px}
.security-section{background:var(--bg);border-block:1px solid var(--line)}
.security-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.security-card{padding:28px;display:flex;align-items:flex-start;gap:18px}
.icon-box{width:42px;height:42px;border-radius:12px;background:var(--sky);color:var(--blue);display:grid;place-items:center;flex-shrink:0;font-size:19px;font-weight:750}
.security-card h3{font-size:17px;margin:0 0 9px}
.security-card p{font-size:14px;color:var(--muted);margin:0}
.faq-wrap{display:grid;grid-template-columns:1fr 1.5fr;gap:70px}
.faq-wrap h2{font-size:28px;margin:0}
.faq-wrap>div>p{margin-top:18px;font-size:14px;color:var(--muted)}
.faq-list{border-top:1px solid var(--line)}
.faq-list details{border-bottom:1px solid var(--line);padding:0 3px}
.faq-list summary{cursor:pointer;list-style:none;padding:21px 30px 21px 0;font-size:15px;font-weight:650;position:relative}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary:after{content:"+";position:absolute;right:4px;top:18px;font-size:23px;color:var(--blue);font-weight:400}
.faq-list details[open] summary:after{content:"−"}
.faq-list summary:hover{color:var(--blue)}
.faq-list details p{font-size:14px;line-height:1.9;color:var(--muted);margin:0 25px 22px 0}
.preferences-section{padding:0 0 70px}
.preference-band{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center;border-radius:var(--radius);background:var(--sky);border:1px solid #d5e4ff;padding:36px}
.preference-band h2{font-size:26px;margin:0 0 12px}
.preference-band p{font-size:14px;color:var(--muted);margin:0}
.preference-form{background:white;border-radius:16px;padding:24px;color:var(--ink);box-shadow:var(--shadow)}
.preference-form label{font-size:13px;font-weight:600;display:block;margin-bottom:10px}
.form-row{display:flex;gap:10px}
.form-row select{min-width:0;flex:1;padding:11px;border:1px solid var(--line);background:var(--bg);color:var(--ink)}
.preference-form small{font-size:11px;color:var(--muted);display:block;margin-top:12px}
.form-status{font-size:12px;min-height:20px;margin:8px 0 0;color:var(--green)}
.article-actions{display:flex;gap:12px;align-items:center;border-top:1px solid var(--line);padding-top:25px;margin-top:35px;flex-wrap:wrap}
.article-actions span{font-size:12px;color:var(--muted)}
.site-footer{background:#f5f8fc;border-top:1px solid var(--line);padding:46px 0 22px}
.footer-top{display:flex;justify-content:space-between;gap:60px;padding-bottom:32px}
.footer-brand{max-width:520px}
.footer-brand p{color:var(--muted);font-size:13px;margin:18px 0 0}
.footer-links{display:flex;gap:22px;align-items:flex-start;flex-wrap:wrap;padding-top:12px;font-size:13px}
.footer-bottom{display:flex;justify-content:space-between;gap:24px;border-top:1px solid var(--line);padding-top:20px;font-size:11px;color:var(--muted)}
.search-status{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;box-shadow:var(--shadow);border-radius:10px;padding:11px 20px;z-index:50;font-size:13px;max-width:calc(100% - 32px)}
.search-status:empty{display:none}
mark.search-hit{background:#fff0a6;color:var(--ink);border-radius:3px;scroll-margin-top:120px}
@media(min-width:1025px){.article-sidebar{position:sticky;top:110px}}
@media(max-width:1024px){.header-inner{gap:24px}.header-tools{gap:10px}.header-tools>.btn{display:none}.article-layout{gap:30px;grid-template-columns:minmax(0,1fr) 240px}.faq-wrap{gap:35px}.preference-band{gap:25px}.footer-top{gap:30px}}
@media(max-width:768px){.container{width:calc(100% - 36px)}.header-inner{height:auto;min-height:76px;flex-wrap:wrap;gap:12px;padding:14px 0}.logo strong{font-size:20px}.logo-mark{height:38px;width:38px}.header-tools{margin-left:auto}.search input{width:95px}.menu-toggle{display:block}.nav{display:none;order:3;width:100%;gap:25px;border-top:1px solid var(--line)}.nav.is-open{display:flex}.nav a{padding:12px 0}.section{padding:45px 0}.hero{padding:24px 0 35px}.breadcrumb{margin-bottom:24px}.article-layout{grid-template-columns:1fr}.article-sidebar{grid-template-columns:1fr 1fr;gap:16px}.article-intro h1{letter-spacing:-.7px}.article-description{font-size:14px}.security-grid{grid-template-columns:1fr}.faq-wrap{grid-template-columns:1fr;gap:24px}.preference-band{grid-template-columns:1fr;padding:26px}.preferences-section{padding-bottom:45px}.footer-top{flex-direction:column;gap:18px}.footer-bottom{flex-direction:column;gap:8px}.quote-section{padding-bottom:40px}.pull-quote{grid-template-columns:42px 1fr;gap:14px}.quote-mark{font-size:68px}.cover-frame figcaption{padding:12px 16px}.section-head h2,.faq-wrap h2{font-size:25px}}
@media(max-width:520px){.container{width:calc(100% - 28px)}.search{padding:6px 7px}.search input{width:75px;font-size:12px}.search button{font-size:12px}.menu-toggle{font-size:12px;padding:6px 8px}.header-inner{gap:8px}.header-tools{gap:7px}.logo{gap:7px}.logo strong{font-size:18px}.logo small{font-size:8px;letter-spacing:2px}.logo-mark{height:33px;width:33px;font-size:18px;border-radius:10px}.article-intro h1{font-size:29px}.cover-frame img{height:230px}.cover-frame figcaption{display:block}.cover-frame figcaption span{display:block}.article-prose{font-size:15px}.article-prose h2{font-size:23px}.article-sidebar{grid-template-columns:1fr}.side-card{padding:21px}.security-card{padding:22px;gap:13px}.preference-band{padding:23px 17px}.preference-form{padding:18px}.form-row{flex-direction:column}.footer-links{gap:16px}.article-actions .btn{flex:1}.article-actions span{width:100%}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}

/* roulang page: category1 */
:root{--blue:#1764e8;--blue-dark:#1048af;--sky:#eaf2ff;--ink:#142641;--muted:#63738b;--line:#e1e9f3;--paper:#fff;--bg:#f5f8fc;--green:#16826e;--radius:20px;--shadow:0 12px 36px rgba(26,64,117,.07);--width:1180px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:106px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;line-height:1.75}
h1,h2,h3,p{margin:0}h2{font-size:clamp(25px,3vw,35px);line-height:1.4;letter-spacing:-.6px}h3{font-size:19px;line-height:1.5}
a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button,input,select{border-radius:10px}img{display:block;width:100%;object-fit:cover}a,button{transition:color .2s,background .2s,transform .2s,box-shadow .2s}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #8cb8ff;outline-offset:4px}a:hover{color:var(--blue)}button:active,.btn:active{transform:translateY(1px)}
.container{width:min(var(--width),calc(100% - 48px));margin:auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(16px)}
.header-inner{height:84px;display:flex;align-items:center;gap:32px}
.logo{display:flex;gap:11px;align-items:center;flex-shrink:0}.logo-mark{width:41px;height:41px;border-radius:12px;background:var(--blue);color:white;display:grid;place-items:center;font-weight:900;font-size:22px;box-shadow:0 5px 12px #1764e82b}.logo strong{font-size:22px;letter-spacing:-1px}.logo small{display:block;font-size:10px;letter-spacing:3px;color:var(--muted);line-height:1.2}
.nav{display:flex;gap:26px;align-items:center}.nav a{font-size:14px;font-weight:600;padding:28px 0;border-bottom:3px solid transparent}.nav a.active{color:var(--blue);border-color:var(--blue)}.nav a:hover{color:var(--blue)}
.header-tools{margin-left:auto;display:flex;gap:12px;align-items:center}.search{display:flex;align-items:center;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:7px 11px;gap:8px}.search input{border:0;background:transparent;width:132px;min-width:0;font-size:13px;color:var(--ink)}.search button{border:0;background:none;color:var(--muted);padding:0 3px}.search:focus-within{border-color:#8cb8ff}
.btn{display:inline-flex;justify-content:center;align-items:center;gap:8px;padding:12px 23px;border:1px solid transparent;border-radius:11px;font-weight:650;font-size:14px;background:var(--blue);color:white}.btn:hover{background:var(--blue-dark);color:white;box-shadow:0 6px 18px #1764e82a;transform:translateY(-2px)}.btn.secondary{background:white;border-color:var(--line);color:var(--ink)}.btn.secondary:hover{border-color:var(--blue);color:var(--blue)}.header-tools>.btn{padding:9px 16px}.quick-link{font-size:13px;white-space:nowrap}.menu-toggle{display:none;border:1px solid var(--line);background:white;padding:7px 12px;color:var(--ink)}
.section{padding:76px 0}.section.alt{background:var(--bg)}.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:48px;margin-bottom:30px}.section-head p{max-width:630px;font-size:14px;margin-top:16px;color:var(--muted)}.eyebrow{display:block;color:var(--blue);font-size:12px;letter-spacing:2px;font-weight:750;margin-bottom:12px}.tag{display:inline-flex;align-items:center;background:var(--sky);color:var(--blue);padding:4px 10px;border-radius:6px;font-size:12px;font-weight:600}.muted{color:var(--muted)}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.card{border:1px solid var(--line);border-radius:var(--radius);background:white;box-shadow:var(--shadow);overflow:hidden;transition:border-color .2s,transform .2s}.card:hover{border-color:#b7cef3}
.hero{position:relative;overflow:hidden;background:#f1f6ff;padding:53px 0 0}.hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(241,246,255,.99),rgba(241,246,255,.94)),url('/assets/images/64439c943f301c4b.png') center/cover;pointer-events:none}.hero .container{position:relative}.breadcrumb{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--muted);margin-bottom:32px}.hero-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:64px;align-items:center}.hero h1{font-size:clamp(34px,4.4vw,54px);line-height:1.25;letter-spacing:-2px;font-weight:850;margin:18px 0 22px}.hero h1 span{color:var(--blue);display:block}.hero-copy>p{font-size:15px;color:var(--muted);max-width:540px}.hero-points{list-style:none;margin:25px 0;padding:0;display:flex;gap:18px;flex-wrap:wrap;font-size:13px}.hero-points li:before{content:"✓";color:var(--green);font-weight:700;margin-right:7px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}
.hero-visual{position:relative;padding:0 0 25px}.hero-visual img{height:310px;border-radius:24px;box-shadow:var(--shadow);background:#e3ecf8}.visual-caption{position:absolute;bottom:0;left:22px;right:22px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:17px 21px;background:white;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:14px}.visual-caption strong{display:block;font-size:15px}.visual-caption small{color:var(--muted);font-size:12px}.visual-symbol{color:var(--blue);font-size:28px;font-weight:800}
.metric-strip{display:grid;grid-template-columns:repeat(4,1fr);margin-top:46px;border-top:1px solid #d9e5f6}.metric{padding:24px 20px 26px;border-right:1px solid #d9e5f6}.metric:first-child{padding-left:0}.metric:last-child{border:0}.metric strong{font-size:26px;color:var(--blue);line-height:1.2;display:block}.metric span{font-size:12px;color:var(--muted)}
.topic-card{padding:28px;position:relative}.topic-index{display:block;color:#aac4eb;font-size:34px;font-weight:800;margin-bottom:20px;line-height:1}.topic-card h3{margin:14px 0 12px}.topic-card p{color:var(--muted);font-size:14px}.plain-list{padding:0;list-style:none;margin:20px 0 0}.plain-list li{padding:11px 0;border-bottom:1px solid var(--line);font-size:13px;display:flex;justify-content:space-between;gap:12px}.plain-list li:last-child{border:0}.plain-list span{color:var(--muted)}
.search-status{font-size:13px;color:var(--muted);margin:14px 0 0;min-height:0}.search-status:empty{display:none}[hidden]{display:none!important}
.compare-layout{display:grid;grid-template-columns:.8fr 1.3fr;gap:70px;align-items:start}.compare-copy p{font-size:14px;color:var(--muted);margin-top:22px}.comparison{background:white;border:1px solid var(--line);border-radius:20px;overflow:hidden;box-shadow:var(--shadow)}.comparison-row{display:grid;grid-template-columns:90px 1fr 1fr;border-bottom:1px solid var(--line);font-size:13px}.comparison-row:last-child{border:0}.comparison-row>div{padding:18px 20px}.comparison-row>div:last-child{background:#f0f6ff}.comparison-row.head{font-weight:700;color:var(--blue)}.comparison-row>div:first-child{font-weight:600}.compare-note{font-size:12px;color:var(--muted);margin-top:15px}
.rhythm-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:35px;border:1px solid var(--line);border-radius:20px;overflow:hidden}.rhythm-item{padding:30px 25px;border-right:1px solid var(--line)}.rhythm-item:last-child{border:0}.step{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--blue);margin-bottom:24px}.step b{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--sky)}.rhythm-item p{font-size:13px;color:var(--muted);margin-top:13px}
.security-layout{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}.security-intro p{font-size:14px;color:var(--muted);margin-top:20px}.security-seal{display:inline-flex;gap:10px;align-items:center;margin-top:25px;color:var(--green);font-size:13px;background:#e7f5f0;border:1px solid #cde7dc;padding:8px 14px;border-radius:9px}.security-list{padding:0;margin:0;list-style:none;display:grid;gap:14px}.security-list li{display:flex;gap:18px;padding:22px;background:white;border:1px solid var(--line);border-radius:15px;box-shadow:var(--shadow)}.security-icon{width:35px;height:35px;display:grid;place-items:center;flex-shrink:0;border-radius:10px;color:var(--blue);background:var(--sky);font-weight:800}.security-list h3{font-size:16px}.security-list p{font-size:13px;color:var(--muted);margin-top:5px}
.quick-grid{display:grid;grid-template-columns:230px 1fr;gap:50px}.quick-grid>div>p{font-size:14px;margin-top:18px;color:var(--muted)}.answer-grid{display:grid;grid-template-columns:1fr 1fr;gap:25px 35px}.answer-item{border-left:3px solid #bbd4fb;padding-left:20px}.answer-item h3{font-size:16px}.answer-item p{font-size:13px;color:var(--muted);margin-top:8px}
.faq-wrap{display:grid;grid-template-columns:1fr 1.5fr;gap:70px}.faq-wrap>div>p{margin-top:18px;font-size:14px;color:var(--muted)}details{border:1px solid var(--line);background:white;border-radius:13px;margin-bottom:12px;overflow:hidden}summary{cursor:pointer;list-style:none;padding:20px 48px 20px 22px;font-size:15px;font-weight:650;position:relative}summary::-webkit-details-marker{display:none}summary:after{content:"+";position:absolute;right:22px;color:var(--blue);font-size:21px;top:14px}details[open] summary:after{content:"−"}details[open] summary{color:var(--blue)}details p{font-size:14px;color:var(--muted);padding:0 22px 22px}summary:hover{background:#f6f9ff}
.preference-band{padding:44px;border-radius:24px;background:var(--blue);display:grid;grid-template-columns:1fr 1fr;gap:55px;align-items:center;color:white;box-shadow:0 16px 35px #1764e825}.preference-band .eyebrow{color:#c4dcff}.preference-band p{font-size:14px;color:#e4edff;margin-top:16px}.preference-form{background:white;border-radius:16px;padding:24px;color:var(--ink)}.preference-form label{font-size:13px;font-weight:600;display:block;margin-bottom:10px}.form-row{display:flex;gap:10px}.form-row select{min-width:0;flex:1;padding:11px;border:1px solid var(--line);background:var(--bg);color:var(--ink)}.preference-form small{font-size:11px;color:var(--muted);display:block;margin-top:12px}.form-status{font-size:12px;min-height:20px;margin-top:10px;color:var(--green)}
.site-footer{padding:54px 0 23px;background:#f5f8fc;border-top:1px solid var(--line)}.footer-top{display:flex;justify-content:space-between;gap:70px;padding-bottom:38px}.footer-brand{max-width:530px}.footer-brand p{font-size:13px;color:var(--muted);margin-top:21px}.footer-links{display:grid;grid-template-columns:1fr 1fr;gap:16px 30px;align-content:start;font-size:13px;padding-top:10px}.footer-bottom{display:flex;justify-content:space-between;gap:24px;border-top:1px solid var(--line);padding-top:22px;color:var(--muted);font-size:11px}
@media(min-width:1025px){.topic-card:hover{transform:translateY(-4px)}}
@media(max-width:1024px){.header-inner{gap:22px}.header-tools{gap:9px}.quick-link{display:none}.search input{width:105px}.hero-grid{gap:30px}.hero-visual img{height:290px}.compare-layout{gap:35px}.rhythm-item{padding:23px 18px}.security-layout,.faq-wrap{gap:35px}.preference-band{gap:30px;padding:32px}.form-row{flex-wrap:wrap}.form-row .btn{flex:1}}
@media(max-width:768px){.container{width:calc(100% - 36px)}.header-inner{height:74px;flex-wrap:wrap;position:relative;gap:14px}.header-tools{gap:10px}.header-tools .search{display:none}.header-tools>.btn{font-size:12px;padding:8px 12px}.menu-toggle{display:block}.nav{display:none;position:absolute;left:-18px;right:-18px;top:74px;background:white;border-bottom:1px solid var(--line);padding:8px 18px 18px;box-shadow:0 14px 20px #1426410d;gap:24px}.nav.is-open{display:flex}.nav a{padding:10px 0}.logo strong{font-size:20px}.section{padding:54px 0}.hero{padding-top:28px}.hero-grid{grid-template-columns:1fr;gap:32px}.hero-copy>p{max-width:none}.hero-visual img{height:280px}.hero-visual{max-width:600px;width:100%;margin:auto}.hero h1{font-size:40px}.breadcrumb{margin-bottom:24px}.metric-strip{margin-top:28px;grid-template-columns:repeat(4,1fr)}.metric{padding:19px 12px}.metric strong{font-size:23px}.section-head{display:block}.grid-3{grid-template-columns:1fr}.topic-card{padding:25px}.topic-index{float:right;margin:0}.plain-list{margin-top:12px}.compare-layout,.security-layout,.faq-wrap,.quick-grid{grid-template-columns:1fr;gap:28px}.rhythm-grid{grid-template-columns:1fr 1fr}.rhythm-item:nth-child(2){border-right:0}.rhythm-item:nth-child(-n+2){border-bottom:1px solid var(--line)}.preference-band{grid-template-columns:1fr;gap:25px}.form-row{flex-wrap:nowrap}.form-row .btn{flex:none}.footer-top{gap:35px}.footer-bottom{flex-direction:column;gap:8px}}
@media(max-width:520px){.container{width:calc(100% - 32px)}.header-inner{gap:8px}.logo{gap:8px}.logo-mark{width:35px;height:35px;font-size:19px}.logo strong{font-size:19px}.logo small{font-size:8px;letter-spacing:2px}.header-tools{gap:7px}.header-tools>.btn{padding:8px 10px}.menu-toggle{font-size:12px;padding:7px 9px}.nav{left:-16px;right:-16px}.hero h1{font-size:34px;letter-spacing:-1px}.hero-visual img{height:225px}.visual-caption{left:12px;right:12px;padding:13px 15px}.metric-strip{grid-template-columns:1fr 1fr}.metric{padding:18px!important}.metric:nth-child(2){border-right:0}.metric:nth-child(-n+2){border-bottom:1px solid #d9e5f6}.hero-points{gap:9px 16px}.comparison-row{grid-template-columns:58px 1fr 1fr;font-size:12px}.comparison-row>div{padding:14px 10px}.rhythm-item{padding:22px 17px}.rhythm-item h3{font-size:17px}.answer-grid{grid-template-columns:1fr;gap:24px}.preference-band{padding:26px 20px;border-radius:18px}.preference-form{padding:19px}.form-row{flex-direction:column}.form-row .btn{width:100%}.footer-top{flex-direction:column}.footer-links{grid-template-columns:repeat(2,1fr);gap:12px}.section-head{margin-bottom:24px}.security-list li{padding:18px;gap:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}