/* roulang page: index */
:root{
            --ink:#191827;
            --ink-soft:#403d50;
            --muted:#777383;
            --paper:#f6f3ee;
            --white:#fffdf9;
            --line:#e5dfd7;
            --coral:#ef6258;
            --coral-dark:#d94c48;
            --mint:#8ed8c8;
            --lemon:#f3db72;
            --radius:8px;
            --shadow:0 14px 34px rgba(25,24,39,.08);
            --container:1180px;
            --ease:all .25s ease;
        }
        *,*:before,*:after{box-sizing:border-box}
        html{scroll-behavior:smooth}
        body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans SC","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
        a{color:inherit;text-decoration:none;transition:var(--ease)}
        img,svg{display:block;max-width:100%}
        button,input{font:inherit}
        button{cursor:pointer}
        :focus-visible{outline:3px solid var(--lemon);outline-offset:3px}
        .container{width:min(var(--container),calc(100% - 48px));margin:auto}
        .topline{height:4px;background:var(--coral)}
        .site-header{background:rgba(255,253,249,.94);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(12px)}
        .nav-wrap{height:76px;display:flex;align-items:center;justify-content:space-between;gap:28px}
        .brand{display:flex;align-items:center;gap:11px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
        .brand-mark{width:36px;height:36px;border-radius:8px;background:var(--ink);display:grid;place-items:center;color:var(--mint);font-size:20px}
        .brand-text{font-size:17px}
        .nav-menu{display:flex;align-items:center;gap:25px;margin-left:auto}
        .nav-menu a{font-size:14px;color:var(--ink-soft);padding:25px 0;position:relative}
        .nav-menu a:after{content:"";position:absolute;left:0;right:100%;bottom:17px;height:2px;background:var(--coral);transition:var(--ease)}
        .nav-menu a:hover,.nav-menu a.active{color:var(--ink)}
        .nav-menu a:hover:after,.nav-menu a.active:after{right:0}
        .nav-cta,.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:6px;padding:11px 20px;font-weight:700;font-size:14px;transition:var(--ease)}
        .nav-cta,.button.primary{background:var(--coral);color:#fff}
        .nav-cta:hover,.button.primary:hover{background:var(--coral-dark);transform:translateY(-2px)}
        .menu-toggle{display:none;border:1px solid var(--line);background:var(--white);border-radius:6px;width:42px;height:40px;color:var(--ink);font-size:20px}
        .hero{background:var(--ink);color:#fff;min-height:570px;overflow:hidden;position:relative}
        .hero:before{content:"";position:absolute;width:500px;height:500px;border:1px solid rgba(142,216,200,.2);border-radius:50%;right:-130px;top:-170px}
        .hero-grid{min-height:570px;display:grid;grid-template-columns:1.04fr .96fr;align-items:center;gap:48px;position:relative}
        .hero-copy{padding:74px 0}
        .eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:13px;color:var(--mint);letter-spacing:.08em;margin-bottom:18px}
        .eyebrow:before{content:"";width:24px;height:2px;background:var(--coral)}
        h1,h2,h3,p{margin-top:0}
        h1{font-size:clamp(42px,5vw,64px);line-height:1.14;letter-spacing:-.04em;margin-bottom:24px}
        .hero-copy p{max-width:590px;color:#d8d5df;font-size:18px;margin-bottom:32px}
        .actions{display:flex;gap:12px;flex-wrap:wrap}
        .button.secondary{color:#fff;border-color:#625e70;background:transparent}
        .button.secondary:hover{border-color:var(--mint);color:var(--mint)}
        .hero-art{align-self:stretch;display:grid;place-items:center;position:relative}
        .art-board{width:min(470px,100%);aspect-ratio:1.08/1;background:#28263b;border:1px solid #49455a;border-radius:12px;padding:22px;transform:rotate(2deg);box-shadow:25px 25px 0 rgba(239,98,88,.85)}
        .art-top{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #49455a;padding-bottom:16px;margin-bottom:22px}
        .art-brand{font-weight:800;color:#fff}
        .art-dots{display:flex;gap:5px}.art-dots i{width:7px;height:7px;background:var(--mint);border-radius:50%}
        .art-content{display:grid;grid-template-columns:1.2fr .8fr;gap:14px}
        .art-feature{height:196px;border-radius:7px;background:linear-gradient(135deg,#ef6258 0 42%,#f3db72 42% 64%,#8ed8c8 64%);padding:18px;color:var(--ink);display:flex;flex-direction:column;justify-content:end}
        .art-feature strong{font-size:22px;line-height:1.2}.art-feature small{margin-top:7px}
        .art-side{display:grid;gap:14px}.art-tile{background:#39364e;border-radius:7px;padding:16px;color:#eee}.art-tile b{display:block;color:var(--mint);font-size:23px}.art-line{height:8px;background:#555166;border-radius:4px;margin-top:10px}
        .ticker{background:var(--white);border-bottom:1px solid var(--line)}
        .ticker-inner{min-height:82px;display:flex;align-items:center;gap:28px}
        .ticker-label{font-weight:800;display:flex;align-items:center;gap:10px;white-space:nowrap}.ticker-label span{background:var(--lemon);padding:2px 8px;border-radius:4px;font-size:12px}
        .ticker-links{display:flex;gap:28px;flex-wrap:wrap;color:var(--ink-soft);font-size:14px}
        .ticker-links a:hover{color:var(--coral)}
        .section{padding:88px 0}.section.compact{padding:68px 0}
        .section-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:34px}
        .section-kicker{color:var(--coral);font-size:13px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;margin-bottom:8px}
        h2{font-size:clamp(28px,3.5vw,40px);line-height:1.2;letter-spacing:-.03em;margin-bottom:10px}
        .section-head p{color:var(--muted);max-width:550px;margin-bottom:0}
        .text-link{font-weight:700;color:var(--coral);white-space:nowrap}.text-link:hover{color:var(--coral-dark)}
        .quick-grid{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
        .quick-item{padding:25px 20px;border-right:1px solid var(--line);min-height:145px}.quick-item:last-child{border-right:0}
        .quick-icon{font-size:24px;color:var(--coral);margin-bottom:10px}.quick-item h3{font-size:17px;margin-bottom:4px}.quick-item p{font-size:13px;color:var(--muted);line-height:1.5;margin:0}.quick-item:hover{background:var(--white)}
        .split{display:grid;grid-template-columns:1fr 1.08fr;gap:76px;align-items:center}
        .interface{background:#e8e3da;border-radius:10px;padding:30px;position:relative}
        .interface-window{background:var(--white);border:1px solid var(--line);padding:22px;border-radius:8px;box-shadow:var(--shadow)}
        .interface-nav{height:12px;width:38%;background:var(--ink);border-radius:5px;margin-bottom:24px}.interface-row{display:grid;grid-template-columns:1.3fr .7fr;gap:12px}.interface-panel{height:112px;border-radius:6px;background:var(--mint);padding:14px}.interface-panel:nth-child(2){background:#f3db72}.interface-panel:nth-child(3){background:#f2c6bd}.interface-panel strong{font-size:24px;display:block}.interface-note{position:absolute;right:-22px;bottom:18px;background:var(--ink);color:white;padding:15px 19px;border-radius:6px;font-size:13px}
        .points{display:grid;gap:21px;margin-top:26px}.point{display:grid;grid-template-columns:40px 1fr;gap:15px}.point-num{width:34px;height:34px;background:var(--mint);border-radius:50%;display:grid;place-items:center;font-weight:800}.point h3{font-size:18px;margin-bottom:3px}.point p{color:var(--muted);font-size:14px;margin:0}
        .dark-section{background:var(--ink);color:white}.dark-section .section-head p{color:#bab6c4}
        .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid #4a4659;border-bottom:1px solid #4a4659}.step{padding:27px 22px 30px;border-right:1px solid #4a4659}.step:last-child{border:0}.step-number{font-size:14px;color:var(--mint);font-weight:800;margin-bottom:30px}.step h3{font-size:19px;margin-bottom:8px}.step p{font-size:14px;color:#bcb9c6;margin:0}
        .download{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}.download-copy h2{max-width:500px}.download-copy p{color:#bcb9c6;max-width:520px}.download-meta{display:flex;gap:20px;flex-wrap:wrap;margin:25px 0;color:#ddd6dc;font-size:14px}.download-meta span{border-left:2px solid var(--coral);padding-left:10px}.qr-row{display:flex;align-items:center;gap:18px}.qr{width:88px;height:88px;background:#fff;display:grid;place-items:center;color:var(--ink);font-size:11px;text-align:center;padding:10px;border-radius:5px}.device{display:flex;justify-content:center}.phone{width:200px;background:#11101b;padding:10px;border-radius:25px;box-shadow:15px 15px 0 #403c50;transform:rotate(-5deg)}.phone-screen{height:350px;border-radius:17px;background:var(--white);padding:16px;color:var(--ink)}.phone-screen b{display:block;font-size:16px;margin-bottom:15px}.phone-card{height:80px;background:var(--coral);border-radius:6px;padding:12px;margin-bottom:10px}.phone-card:nth-child(3){background:var(--mint)}.phone-bar{height:9px;background:#ded9d0;border-radius:5px;margin-top:16px}
        .timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;position:relative}.timeline:before{content:"";position:absolute;top:18px;left:8%;right:8%;height:1px;background:var(--line)}.time-item{position:relative}.time-dot{width:36px;height:36px;background:var(--paper);border:7px solid var(--coral);border-radius:50%;margin-bottom:22px;position:relative;z-index:1}.time-item h3{font-size:18px;margin-bottom:6px}.time-item p{font-size:14px;color:var(--muted);margin:0}
        .updates{background:var(--white);border:1px solid var(--line);border-radius:8px;overflow:hidden}.update-item{display:grid;grid-template-columns:100px 110px 1fr 100px;align-items:center;gap:18px;padding:21px 25px;border-bottom:1px solid var(--line)}.update-item:last-child{border-bottom:0}.update-date{font-size:13px;color:var(--muted)}.badge{display:inline-flex;width:max-content;padding:3px 9px;background:#e5f5f1;color:#247668;border-radius:4px;font-size:12px;font-weight:700}.update-item h3{font-size:16px;margin:0 0 3px}.update-item p{font-size:13px;color:var(--muted);margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.update-arrow{text-align:right;color:var(--coral);font-size:20px}.update-item:hover{background:#fffaf4}
        .activity-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}.activity{background:var(--white);padding:24px}.activity time{font-size:13px;color:var(--coral);font-weight:700}.activity h3{font-size:18px;margin:10px 0 5px}.activity p{font-size:14px;color:var(--muted);margin:0}
        .feature-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:18px}.feature-main{background:var(--ink);color:#fff;padding:36px;min-height:250px;border-radius:8px;display:flex;flex-direction:column;justify-content:end}.feature-main h3{font-size:28px;max-width:530px;margin-bottom:10px}.feature-main p{color:#c4c0cc;margin:0;max-width:600px}.recommend-list{display:grid;gap:18px}.recommend{background:var(--white);border:1px solid var(--line);padding:20px;border-radius:8px}.recommend h3{font-size:16px;margin-bottom:5px}.recommend p{font-size:13px;color:var(--muted);margin:0}
        .guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.guide-card{background:var(--white);border:1px solid var(--line);padding:25px;border-radius:8px}.guide-card strong{display:block;color:var(--coral);font-size:13px;margin-bottom:12px}.guide-card h3{font-size:18px;margin-bottom:7px}.guide-card p{font-size:14px;color:var(--muted);margin:0}
        .security{background:#e5f5f1;border-left:5px solid var(--mint);padding:30px 34px;display:grid;grid-template-columns:.8fr 1.2fr;gap:40px;align-items:center}.security h2{margin:0}.check-list{display:grid;grid-template-columns:1fr 1fr;gap:14px}.check{font-size:14px;color:var(--ink-soft)}.check:before{content:"✓";color:#247668;font-weight:800;margin-right:9px}
        .faq-list{max-width:850px;margin:auto;border-top:1px solid var(--line)}.faq-item{border-bottom:1px solid var(--line)}.faq-question{width:100%;padding:20px 0;background:none;border:0;text-align:left;display:flex;justify-content:space-between;gap:20px;color:var(--ink);font-weight:700;font-size:16px}.faq-question span{color:var(--coral);font-size:22px;line-height:1}.faq-answer{display:none;color:var(--muted);font-size:14px;padding:0 40px 20px 0}.faq-item.open .faq-answer{display:block}.faq-item.open .faq-question span{transform:rotate(45deg)}
        .final-cta{background:var(--coral);color:#fff;padding:42px 48px;border-radius:8px;display:flex;justify-content:space-between;align-items:center;gap:30px}.final-cta h2{margin:0;font-size:30px}.final-cta p{margin:7px 0 0;color:#ffe9e5}.button.light{background:#fff;color:var(--ink)}.button.light:hover{background:var(--lemon)}
        .index-bar{display:flex;justify-content:space-between;gap:20px;align-items:center;border-top:1px solid var(--line);padding-top:24px;color:var(--muted);font-size:13px}.index-links{display:flex;gap:18px;flex-wrap:wrap}.index-links a:hover{color:var(--coral)}
        footer{background:var(--ink);color:#fff;padding:58px 0 24px}.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:40px;padding-bottom:45px}.footer-brand p{color:#aaa6b4;font-size:14px;max-width:300px}.footer-title{font-size:14px;color:var(--mint);font-weight:800;margin-bottom:15px}.footer-links{display:grid;gap:8px;color:#c7c3ce;font-size:14px}.footer-links a:hover{color:#fff}.copyright{border-top:1px solid #403c50;padding-top:20px;color:#85818f;font-size:12px;display:flex;justify-content:space-between;gap:20px}
        .empty{padding:45px;text-align:center;color:var(--muted)}.empty strong{display:block;color:var(--ink);font-size:18px;margin-bottom:5px}
        @media(max-width:1024px){.nav-menu{gap:14px}.quick-grid{grid-template-columns:repeat(3,1fr)}.quick-item:nth-child(3){border-right:0}.quick-item:nth-child(n+4){border-top:1px solid var(--line)}.split{gap:40px}.footer-grid{grid-template-columns:1.3fr repeat(3,1fr);gap:22px}}
        @media(max-width:768px){.container{width:min(100% - 32px,var(--container))}.nav-wrap{height:68px}.menu-toggle{display:block}.nav-menu{display:none;position:absolute;top:72px;left:16px;right:16px;background:var(--white);border:1px solid var(--line);box-shadow:var(--shadow);padding:12px;flex-direction:column;align-items:stretch;gap:0}.nav-menu.open{display:flex}.nav-menu a{padding:12px 10px}.nav-menu a:after{bottom:5px}.nav-cta{display:none}.hero-grid,.download,.split{grid-template-columns:1fr}.hero{min-height:0}.hero-grid{padding:55px 0}.hero-copy{padding:0}.hero-art{padding:20px 20px 38px}.quick-grid{grid-template-columns:repeat(2,1fr)}.quick-item:nth-child(2){border-right:0}.quick-item:nth-child(3){border-right:1px solid var(--line)}.quick-item:nth-child(4){border-right:0}.section{padding:65px 0}.section-head{display:block}.section-head .text-link{display:inline-block;margin-top:12px}.steps,.timeline{grid-template-columns:1fr 1fr;gap:20px}.step{border-right:0;border-bottom:1px solid #4a4659}.timeline:before{display:none}.update-item{grid-template-columns:82px 90px 1fr}.update-arrow{display:none}.activity-strip,.feature-grid,.guide-grid{grid-template-columns:1fr}.security{grid-template-columns:1fr;gap:20px}.final-cta{display:block;padding:32px}.final-cta .button{margin-top:20px}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}}
        @media(max-width:520px){h1{font-size:36px}.hero-copy p{font-size:16px}.quick-grid{grid-template-columns:1fr}.quick-item,.quick-item:nth-child(3){border-right:0;border-bottom:1px solid var(--line)}.quick-item:last-child{border-bottom:0}.art-board{padding:14px;box-shadow:12px 12px 0 rgba(239,98,88,.85)}.art-feature{height:160px}.steps,.timeline{grid-template-columns:1fr}.download{gap:35px}.device{order:-1}.phone{width:180px}.phone-screen{height:310px}.update-item{grid-template-columns:1fr;gap:5px}.update-item p{white-space:normal}.check-list{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.copyright{display:block}.copyright span{display:block;margin-top:8px}}

/* roulang page: article */
:root{
            --ink:#191827;
            --ink-soft:#403d50;
            --muted:#777383;
            --paper:#f6f3ee;
            --white:#fffdf9;
            --line:#e5dfd7;
            --coral:#ef6258;
            --coral-dark:#d94c48;
            --mint:#8ed8c8;
            --lemon:#f3db72;
            --radius:8px;
            --shadow:0 14px 34px rgba(25,24,39,.08);
            --container:1180px;
            --ease:all .25s ease;
        }
        *{box-sizing:border-box}
        html{scroll-behavior:smooth}
        body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans SC","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
        a{color:inherit;text-decoration:none;transition:var(--ease)}
        a:hover{color:var(--coral)}
        img,svg{display:block;max-width:100%}
        button,input{font:inherit}
        button{cursor:pointer}
        .container{width:min(var(--container),calc(100% - 48px));margin:auto}
        .site-header{background:rgba(255,253,249,.95);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(12px)}
        .nav-wrap{height:76px;display:flex;align-items:center;justify-content:space-between;gap:28px}
        .brand{display:flex;align-items:center;gap:11px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
        .brand-mark{width:36px;height:36px;border-radius:8px;background:var(--ink);display:grid;place-items:center;color:var(--mint);font-size:20px}
        .brand-text{font-size:17px}
        .nav-menu{display:flex;align-items:center;gap:25px;margin-left:auto}
        .nav-menu a{font-size:14px;color:var(--ink-soft);padding:25px 0;position:relative}
        .nav-menu a:after{content:"";position:absolute;left:0;right:100%;bottom:17px;height:2px;background:var(--coral);transition:var(--ease)}
        .nav-menu a:hover,.nav-menu a.active{color:var(--ink)}
        .nav-menu a:hover:after,.nav-menu a.active:after{right:0}
        .nav-cta,.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:6px;padding:11px 20px;font-weight:700;font-size:14px;transition:var(--ease)}
        .nav-cta,.button.primary{background:var(--coral);color:#fff}
        .nav-cta:hover,.button.primary:hover{background:var(--coral-dark);color:#fff;transform:translateY(-2px)}
        .button.secondary{color:var(--ink);border-color:var(--line);background:var(--white)}
        .button.secondary:hover{border-color:var(--ink);color:var(--ink);transform:translateY(-2px)}
        .menu-toggle{display:none;border:1px solid var(--line);background:var(--white);border-radius:6px;width:42px;height:40px;color:var(--ink);font-size:20px}
        :focus-visible{outline:3px solid rgba(239,98,88,.38);outline-offset:3px}
        .article-intro{background:var(--ink);color:#fff;padding:70px 0 76px}
        .breadcrumb{display:flex;align-items:center;gap:10px;color:#a8a4b3;font-size:13px;margin-bottom:28px;flex-wrap:wrap}
        .breadcrumb a:hover{color:var(--mint)}
        .breadcrumb .current{color:var(--mint);max-width:600px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
        .article-label{display:inline-flex;align-items:center;gap:9px;color:var(--mint);font-size:13px;font-weight:700;letter-spacing:.08em;margin-bottom:15px}
        .article-label:before{content:"";width:24px;height:2px;background:var(--coral)}
        .article-intro h1{font-size:clamp(34px,5vw,58px);line-height:1.2;letter-spacing:-.03em;max-width:900px;margin:0 0 22px}
        .article-lead{font-size:18px;line-height:1.8;color:#d8d5df;max-width:800px;margin:0}
        .article-meta{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:28px;color:#b9b5c1;font-size:14px}
        .meta-tag{display:inline-flex;padding:4px 10px;border-radius:4px;background:rgba(142,216,200,.14);color:var(--mint)}
        .reading-layout{display:grid;grid-template-columns:220px minmax(0,760px);gap:58px;align-items:start;padding:72px 0 88px}
        .toc{position:sticky;top:104px;border-left:2px solid var(--line);padding-left:20px}
        .toc-title{font-size:13px;color:var(--coral);font-weight:800;letter-spacing:.08em;margin-bottom:14px}
        .toc a{display:block;color:var(--muted);font-size:14px;padding:5px 0}
        .toc a:hover{color:var(--ink);padding-left:4px}
        .article-body{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:42px 48px;box-shadow:0 8px 24px rgba(25,24,39,.035);overflow:hidden}
        .article-body h2{font-size:30px;line-height:1.35;margin:34px 0 16px}
        .article-body h3{font-size:21px;line-height:1.45;margin:27px 0 12px}
        .article-body p{color:var(--ink-soft);margin:0 0 20px}
        .article-body ul,.article-body ol{color:var(--ink-soft);padding-left:24px;margin:0 0 22px}
        .article-body li{margin:7px 0}
        .article-body blockquote{border-left:4px solid var(--coral);background:#fff7f2;margin:26px 0;padding:18px 22px;color:var(--ink-soft)}
        .article-body img{width:100%;height:auto;border-radius:6px;margin:25px 0}
        .article-body table{width:100%;border-collapse:collapse;margin:24px 0;font-size:14px}
        .article-body th,.article-body td{border:1px solid var(--line);padding:11px;text-align:left}
        .article-body th{background:#f8eee9}
        .empty-state{border:1px dashed #cfc6bc;background:#fffaf4;text-align:center;padding:58px 24px;border-radius:8px}
        .empty-state h2{margin:0 0 10px;font-size:26px}
        .empty-state p{color:var(--muted);margin:0 0 22px}
        .section{padding:78px 0}
        .section.compact{padding:58px 0}
        .section-head{display:flex;justify-content:space-between;align-items:end;gap:25px;margin-bottom:28px}
        .section-kicker{color:var(--coral);font-size:13px;font-weight:800;letter-spacing:.1em;margin-bottom:7px}
        .section-head h2{font-size:32px;line-height:1.3;margin:0}
        .section-head p{color:var(--muted);max-width:540px;margin:0}
        .support-panel{display:grid;grid-template-columns:1fr 1fr;gap:18px}
        .support-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:25px}
        .support-card h3{font-size:19px;margin:0 0 8px}
        .support-card p{font-size:14px;color:var(--muted);margin:0 0 16px}
        .article-links{display:flex;gap:10px;flex-wrap:wrap}
        .reading-bar{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:20px 0;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
        .reading-bar a{font-weight:700;color:var(--ink-soft)}
        .reading-bar a:hover{color:var(--coral)}
        .cta-strip{background:var(--ink);color:#fff;border-radius:8px;padding:32px 38px;display:flex;justify-content:space-between;align-items:center;gap:25px}
        .cta-strip h2{font-size:25px;margin:0 0 5px}
        .cta-strip p{color:#c5c1cc;margin:0;font-size:14px}
        footer{background:var(--ink);color:#fff;border-top:1px solid rgba(255,255,255,.08);padding:58px 0 24px}
        .footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:35px;padding-bottom:45px}
        .footer-brand .brand{margin-bottom:16px}
        .footer-brand p{color:#aaa6b4;font-size:14px;max-width:310px;margin:0}
        .footer-title{font-size:14px;color:var(--mint);font-weight:700;margin-bottom:14px}
        .footer-links{display:grid;gap:8px}
        .footer-links a{color:#bbb7c2;font-size:14px}
        .footer-links a:hover{color:#fff}
        .copyright{border-top:1px solid rgba(255,255,255,.12);padding-top:20px;color:#918d9b;font-size:12px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
        .back-top{position:fixed;right:24px;bottom:24px;width:42px;height:42px;border:1px solid var(--line);border-radius:6px;background:var(--white);color:var(--ink);display:grid;place-items:center;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:var(--ease)}
        .back-top.show{opacity:1;pointer-events:auto}
        @media (max-width:1024px){
            .nav-menu{gap:15px}
            .reading-layout{grid-template-columns:180px minmax(0,1fr);gap:35px}
            .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr}
        }
        @media (max-width:768px){
            .container{width:min(var(--container),calc(100% - 32px))}
            .nav-wrap{height:68px}
            .nav-menu{display:none;position:absolute;left:16px;right:16px;top:76px;background:var(--white);border:1px solid var(--line);padding:10px 18px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch;gap:0}
            .nav-menu.open{display:flex}
            .nav-menu a{padding:11px 0;border-bottom:1px solid var(--line)}
            .nav-menu a:last-child{border-bottom:0}
            .nav-menu a:after{bottom:0}
            .nav-cta{display:none}
            .menu-toggle{display:block}
            .article-intro{padding:48px 0 54px}
            .article-intro h1{font-size:40px}
            .reading-layout{display:block;padding:48px 0 65px}
            .toc{position:static;border:1px solid var(--line);background:var(--white);padding:18px 20px;margin-bottom:24px;border-radius:8px}
            .toc a{display:inline-block;margin-right:16px}
            .article-body{padding:28px 24px}
            .article-body h2{font-size:26px}
            .support-panel{grid-template-columns:1fr}
            .cta-strip{align-items:flex-start;flex-direction:column;padding:28px 24px}
            .footer-grid{grid-template-columns:1fr 1fr}
        }
        @media (max-width:520px){
            .brand-text{font-size:15px}
            .article-intro h1{font-size:34px}
            .article-lead{font-size:16px}
            .article-body{padding:24px 18px}
            .section-head{display:block}
            .section-head h2{font-size:27px;margin-bottom:10px}
            .reading-bar{display:grid;gap:10px}
            .footer-grid{grid-template-columns:1fr;gap:28px}
            .copyright{display:block}
            .copyright span{display:block;margin-bottom:6px}
        }

/* roulang page: category1 */
:root{
            --ink:#191827;
            --ink-soft:#403d50;
            --muted:#777383;
            --paper:#f6f3ee;
            --white:#fffdf9;
            --line:#e5dfd7;
            --coral:#ef6258;
            --coral-dark:#d94c48;
            --mint:#8ed8c8;
            --lemon:#f3db72;
            --radius:8px;
            --shadow:0 14px 34px rgba(25,24,39,.08);
            --container:1180px;
            --ease:all .25s ease;
        }
        *{box-sizing:border-box}
        html{scroll-behavior:smooth}
        body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans SC","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
        a{color:inherit;text-decoration:none;transition:var(--ease)}
        img,svg{display:block;max-width:100%}
        button,input{font:inherit}
        button{cursor:pointer}
        .container{width:min(var(--container),calc(100% - 48px));margin:auto}
        .site-header{background:rgba(255,253,249,.95);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(12px)}
        .nav-wrap{height:76px;display:flex;align-items:center;justify-content:space-between;gap:28px}
        .brand{display:flex;align-items:center;gap:11px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
        .brand-mark{width:36px;height:36px;border-radius:8px;background:var(--ink);display:grid;place-items:center;color:var(--mint);font-size:20px}
        .brand-text{font-size:17px}
        .nav-menu{display:flex;align-items:center;gap:25px;margin-left:auto}
        .nav-menu a{font-size:14px;color:var(--ink-soft);padding:25px 0;position:relative}
        .nav-menu a:after{content:"";position:absolute;left:0;right:100%;bottom:17px;height:2px;background:var(--coral);transition:var(--ease)}
        .nav-menu a:hover,.nav-menu a.active{color:var(--ink)}
        .nav-menu a:hover:after,.nav-menu a.active:after{right:0}
        .nav-cta,.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:6px;padding:11px 20px;font-weight:700;font-size:14px;transition:var(--ease)}
        .nav-cta,.button.primary{background:var(--coral);color:#fff}
        .nav-cta:hover,.button.primary:hover{background:var(--coral-dark);transform:translateY(-2px)}
        .button.secondary{color:var(--ink);border-color:var(--ink);background:transparent}
        .button.secondary:hover{background:var(--ink);color:#fff}
        .menu-toggle{display:none;border:1px solid var(--line);background:var(--white);border-radius:6px;width:42px;height:40px;color:var(--ink);font-size:20px}
        .page-head{padding:54px 0 48px;background:var(--white);border-bottom:1px solid var(--line)}
        .crumbs{font-size:13px;color:var(--muted);display:flex;gap:10px;align-items:center;margin-bottom:25px}
        .crumbs a:hover{color:var(--coral)}
        .crumbs span{color:#b1a9a0}
        .head-grid{display:grid;grid-template-columns:1fr .72fr;gap:60px;align-items:end}
        .eyebrow,.section-kicker{display:block;color:var(--coral);font-size:13px;font-weight:800;letter-spacing:.1em;margin-bottom:9px}
        h1,h2,h3,p{margin-top:0}
        h1{font-size:clamp(38px,5vw,58px);line-height:1.15;letter-spacing:-.03em;margin-bottom:18px}
        .head-grid p{color:var(--muted);max-width:570px;margin-bottom:0}
        .head-note{border-left:3px solid var(--mint);padding:18px 0 18px 22px;color:var(--ink-soft);font-size:15px}
        .section{padding:82px 0}
        .section.compact{padding:62px 0}
        .section-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:30px}
        .section-head h2{font-size:32px;line-height:1.25;margin:0}
        .section-head p{color:var(--muted);max-width:550px;margin:0}
        .intro-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
        .intro-panel{background:var(--ink);color:#fff;padding:34px;border-radius:var(--radius);min-height:210px}
        .intro-panel h2{font-size:27px;margin-bottom:15px}
        .intro-panel p{color:#d8d5df;margin-bottom:0}
        .signal-panel{background:var(--mint);padding:30px;border-radius:var(--radius);display:flex;flex-direction:column;justify-content:space-between}
        .signal-panel strong{font-size:42px;line-height:1;color:var(--ink)}
        .signal-panel span{color:var(--ink-soft);font-size:14px}
        .scene-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
        .scene-card{background:var(--white);border:1px solid var(--line);padding:26px;border-radius:var(--radius);min-height:190px;transition:var(--ease)}
        .scene-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#d5c9bd}
        .scene-number{color:var(--coral);font-size:13px;font-weight:800;display:block;margin-bottom:17px}
        .scene-card h3{font-size:20px;margin-bottom:9px}
        .scene-card p{font-size:14px;color:var(--muted);margin:0}
        .filter-bar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px}
        .filter-bar button{border:1px solid var(--line);background:var(--white);border-radius:5px;color:var(--ink-soft);padding:8px 15px;font-size:13px;transition:var(--ease)}
        .filter-bar button:hover,.filter-bar button.active{background:var(--ink);border-color:var(--ink);color:#fff}
        .content-list{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
        .update-item{display:grid;grid-template-columns:105px 115px 1fr 40px;align-items:center;gap:18px;padding:20px 24px;border-bottom:1px solid var(--line)}
        .update-item:last-child{border-bottom:0}
        .update-item:hover{background:#fffaf4}
        .update-date{font-size:13px;color:var(--muted)}
        .badge{display:inline-flex;width:max-content;padding:3px 9px;background:#e5f5f1;color:#247668;border-radius:4px;font-size:12px;font-weight:700}
        .update-item h3{font-size:17px;margin:0 0 3px}
        .update-item p{font-size:13px;color:var(--muted);margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
        .update-arrow{color:var(--coral);font-size:22px;text-align:right}
        .empty-state{padding:48px 24px;text-align:center;color:var(--muted)}
        .empty-state strong{display:block;color:var(--ink);font-size:18px;margin-bottom:5px}
        .empty-state p{margin:0}
        .feature-row{display:grid;grid-template-columns:1.3fr .7fr;gap:18px}
        .feature-main{background:var(--coral);color:#fff;padding:36px;border-radius:var(--radius);min-height:245px;display:flex;flex-direction:column;justify-content:end}
        .feature-main h2{font-size:30px;max-width:580px;margin-bottom:12px}
        .feature-main p{color:#fff4f0;margin:0;max-width:600px}
        .feature-side{background:var(--lemon);padding:30px;border-radius:var(--radius);display:flex;flex-direction:column;justify-content:space-between}
        .feature-side h3{font-size:21px}
        .feature-side p{font-size:14px;color:var(--ink-soft);margin:0}
        .steps{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
        .step{padding:25px 22px;border-right:1px solid var(--line)}
        .step:last-child{border-right:0}
        .step b{font-size:30px;color:var(--coral);line-height:1}
        .step h3{font-size:18px;margin:16px 0 7px}
        .step p{font-size:14px;color:var(--muted);margin:0}
        .faq-list{max-width:850px;margin:auto}
        .faq-item{border-top:1px solid var(--line)}
        .faq-item:last-child{border-bottom:1px solid var(--line)}
        .faq-item summary{cursor:pointer;list-style:none;padding:20px 4px;font-weight:700;position:relative;padding-right:35px}
        .faq-item summary::-webkit-details-marker{display:none}
        .faq-item summary:after{content:"＋";position:absolute;right:3px;color:var(--coral);font-size:20px}
        .faq-item[open] summary:after{content:"－"}
        .faq-answer{color:var(--muted);font-size:14px;padding:0 35px 21px 4px}
        .cta-band{background:var(--ink);color:#fff;padding:34px 38px;border-radius:var(--radius);display:flex;align-items:center;justify-content:space-between;gap:25px}
        .cta-band h2{font-size:27px;margin-bottom:6px}
        .cta-band p{color:#c7c3cf;margin:0}
        footer{background:var(--ink);color:#fff;padding:62px 0 24px;margin-top:0}
        .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:35px;padding-bottom:45px}
        .footer-brand p{color:#bdb8c5;font-size:14px;max-width:290px;margin:17px 0 0}
        .footer-title{font-size:14px;color:var(--mint);font-weight:700;margin-bottom:15px}
        .footer-links{display:grid;gap:8px}
        .footer-links a{color:#c8c4ce;font-size:14px}
        .footer-links a:hover{color:var(--coral)}
        .copyright{border-top:1px solid #373444;padding-top:20px;display:flex;justify-content:space-between;gap:20px;color:#9994a5;font-size:12px}
        :focus-visible{outline:3px solid var(--lemon);outline-offset:3px}
        @media(max-width:1024px){
            .nav-menu{gap:15px}
            .head-grid{gap:35px}
            .scene-grid{grid-template-columns:repeat(2,1fr)}
        }
        @media(max-width:768px){
            .container{width:min(var(--container),calc(100% - 32px))}
            .nav-wrap{height:68px}
            .menu-toggle{display:block}
            .nav-menu{display:none;position:absolute;left:16px;right:16px;top:76px;background:var(--white);border:1px solid var(--line);padding:8px 20px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch;gap:0}
            .nav-menu.open{display:flex}
            .nav-menu a{padding:12px 0}
            .nav-menu a:after{bottom:7px}
            .nav-cta{display:none}
            .page-head{padding:38px 0}
            .head-grid,.intro-grid,.feature-row{grid-template-columns:1fr;gap:20px}
            .section{padding:62px 0}
            .section-head{display:block}
            .section-head p{margin-top:12px}
            .update-item{grid-template-columns:85px 95px 1fr 25px;gap:10px;padding:17px 15px}
            .steps{grid-template-columns:repeat(2,1fr)}
            .step:nth-child(2){border-right:0}
            .step:nth-child(-n+2){border-bottom:1px solid var(--line)}
            .footer-grid{grid-template-columns:repeat(2,1fr)}
            .cta-band{display:block;padding:28px}
            .cta-band .button{margin-top:20px}
        }
        @media(max-width:520px){
            h1{font-size:36px}
            .brand-text{font-size:14px}
            .scene-grid,.steps,.footer-grid{grid-template-columns:1fr}
            .step{border-right:0;border-bottom:1px solid var(--line)!important}
            .step:last-child{border-bottom:0!important}
            .update-item{grid-template-columns:1fr 25px}
            .update-date,.update-item .badge{margin-bottom:2px}
            .update-item .badge{grid-row:1}
            .update-item h3{grid-column:1}
            .update-item p{grid-column:1}
            .update-arrow{grid-column:2;grid-row:1 / span 3}
            .copyright{display:block}
            .copyright span{display:block;margin-bottom:7px}
        }

/* roulang page: category2 */
:root{
            --ink:#191827;
            --ink-soft:#403d50;
            --muted:#777383;
            --paper:#f6f3ee;
            --white:#fffdf9;
            --line:#e5dfd7;
            --coral:#ef6258;
            --coral-dark:#d94c48;
            --mint:#8ed8c8;
            --lemon:#f3db72;
            --radius:8px;
            --shadow:0 14px 34px rgba(25,24,39,.08);
            --container:1180px;
            --ease:all .25s ease;
        }
        *{box-sizing:border-box}
        html{scroll-behavior:smooth}
        body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans SC","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
        a{color:inherit;text-decoration:none;transition:var(--ease)}
        img,svg{display:block;max-width:100%}
        button,input{font:inherit}
        button{cursor:pointer}
        .container{width:min(var(--container),calc(100% - 48px));margin:auto}
        .site-header{background:rgba(255,253,249,.96);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(12px)}
        .nav-wrap{height:76px;display:flex;align-items:center;justify-content:space-between;gap:28px}
        .brand{display:flex;align-items:center;gap:11px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
        .brand-mark{width:36px;height:36px;border-radius:8px;background:var(--ink);display:grid;place-items:center;color:var(--mint);font-size:20px}
        .brand-text{font-size:17px}
        .nav-menu{display:flex;align-items:center;gap:25px;margin-left:auto}
        .nav-menu a{font-size:14px;color:var(--ink-soft);padding:25px 0;position:relative}
        .nav-menu a:after{content:"";position:absolute;left:0;right:100%;bottom:17px;height:2px;background:var(--coral);transition:var(--ease)}
        .nav-menu a:hover,.nav-menu a.active{color:var(--ink)}
        .nav-menu a:hover:after,.nav-menu a.active:after{right:0}
        .nav-cta,.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:6px;padding:11px 20px;font-weight:700;font-size:14px;transition:var(--ease)}
        .nav-cta,.button.primary{background:var(--coral);color:#fff}
        .nav-cta:hover,.button.primary:hover{background:var(--coral-dark);transform:translateY(-2px)}
        .button.secondary{color:var(--ink);border-color:var(--ink);background:transparent}
        .button.secondary:hover{background:var(--ink);color:#fff}
        .menu-toggle{display:none;border:1px solid var(--line);background:var(--white);border-radius:6px;width:42px;height:40px;color:var(--ink);font-size:20px}
        .page-head{padding:42px 0 54px;border-bottom:1px solid var(--line)}
        .breadcrumb{display:flex;gap:10px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:25px}
        .breadcrumb a:hover{color:var(--coral)}
        .breadcrumb span{color:#b6b0a8}
        .page-head-grid{display:grid;grid-template-columns:1fr 330px;gap:60px;align-items:end}
        .eyebrow,.section-kicker{color:var(--coral);font-size:13px;font-weight:800;letter-spacing:.1em;margin-bottom:9px}
        h1,h2,h3,p{margin-top:0}
        h1{font-size:clamp(38px,5vw,58px);line-height:1.16;letter-spacing:-.03em;margin-bottom:18px}
        h2{font-size:32px;line-height:1.3;margin-bottom:12px}
        h3{font-size:19px;line-height:1.4;margin-bottom:8px}
        .page-intro{max-width:700px;color:var(--ink-soft);font-size:17px;margin:0}
        .head-note{border-left:3px solid var(--mint);padding:17px 0 17px 20px;color:var(--muted);font-size:14px}
        .section{padding:78px 0}
        .section.compact{padding:60px 0}
        .section-head{display:flex;justify-content:space-between;align-items:end;gap:28px;margin-bottom:30px}
        .section-head p{color:var(--muted);max-width:570px;margin-bottom:0}
        .text-link{font-weight:700;color:var(--coral);white-space:nowrap}
        .text-link:hover{color:var(--coral-dark)}
        .download-layout{display:grid;grid-template-columns:1fr 390px;gap:34px;align-items:stretch}
        .download-panel{background:var(--ink);color:#fff;padding:42px;border-radius:var(--radius);position:relative;overflow:hidden}
        .download-panel:after{content:"";position:absolute;width:250px;height:250px;border:1px solid rgba(142,216,200,.25);border-radius:50%;right:-90px;top:-90px}
        .download-panel h2{max-width:550px}
        .download-panel p{color:#d5d1dc;max-width:600px}
        .download-tags{display:flex;gap:10px;flex-wrap:wrap;margin:25px 0}
        .download-tags span{font-size:13px;color:var(--mint);border:1px solid rgba(142,216,200,.45);padding:5px 10px;border-radius:4px}
        .device-visual{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:25px;display:flex;align-items:center;justify-content:center;gap:22px;min-height:290px}
        .phone{width:128px;height:224px;border:7px solid var(--ink);border-radius:20px;background:#eee9e1;padding:10px;position:relative;box-shadow:var(--shadow)}
        .phone:before{content:"";display:block;width:38px;height:5px;border-radius:5px;background:var(--ink);margin:0 auto 13px}
        .screen-top{height:34px;background:var(--coral);border-radius:4px;margin-bottom:9px}
        .screen-line{height:9px;background:var(--mint);border-radius:3px;margin:8px 0}
        .screen-line.short{width:62%;background:var(--lemon)}
        .screen-block{height:62px;background:var(--ink);border-radius:4px;margin-top:12px}
        .qr-box{width:112px;height:112px;padding:9px;background:#fff;border:1px solid var(--line);display:grid;grid-template-columns:repeat(7,1fr);gap:3px}
        .qr-box i{background:var(--ink);display:block}
        .qr-box i:nth-child(3n),.qr-box i:nth-child(7n){background:var(--coral)}
        .device-copy{font-size:13px;color:var(--muted);max-width:125px}
        .device-copy strong{display:block;color:var(--ink);font-size:16px;margin-bottom:7px}
        .feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
        .feature-card{background:var(--white);border:1px solid var(--line);padding:26px;border-radius:var(--radius);min-height:190px;transition:var(--ease)}
        .feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#d4cbc0}
        .feature-num{font-size:13px;color:var(--coral);font-weight:800;display:block;margin-bottom:20px}
        .feature-card p,.step p,.faq-item p{color:var(--muted);font-size:14px;margin:0}
        .spec-strip{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
        .spec{padding:23px 22px;border-right:1px solid var(--line)}
        .spec:last-child{border-right:0}
        .spec strong{display:block;font-size:22px;margin-bottom:4px}
        .spec span{font-size:13px;color:var(--muted)}
        .content-layout{display:grid;grid-template-columns:1.25fr .75fr;gap:55px;align-items:start}
        .update-list{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
        .update-item{display:grid;grid-template-columns:95px 100px 1fr 26px;align-items:center;gap:16px;padding:20px 23px;border-bottom:1px solid var(--line)}
        .update-item:last-child{border-bottom:0}
        .update-item:hover{background:#fffaf4}
        .date{font-size:13px;color:var(--muted)}
        .badge{display:inline-flex;width:max-content;padding:3px 9px;background:#e5f5f1;color:#247668;border-radius:4px;font-size:12px;font-weight:700}
        .update-item h3{font-size:16px;margin:0 0 3px}
        .update-item p{font-size:13px;color:var(--muted);margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
        .arrow{color:var(--coral);font-size:20px}
        .empty-state{padding:35px 24px;color:var(--muted);text-align:center}
        .side-note{background:var(--lemon);padding:30px;border-radius:var(--radius)}
        .side-note h3{font-size:22px}
        .side-note p{color:var(--ink-soft);font-size:14px;margin-bottom:20px}
        .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--line)}
        .step{padding:25px 22px 8px;border-right:1px solid var(--line);position:relative}
        .step:last-child{border-right:0}
        .step-number{width:32px;height:32px;background:var(--mint);border-radius:50%;display:grid;place-items:center;font-weight:800;margin-bottom:18px}
        .safety{background:#e9f6f2;padding:34px;border-radius:var(--radius);display:grid;grid-template-columns:1fr 1fr;gap:25px}
        .safety-list{display:grid;gap:12px}
        .safety-list div{display:flex;gap:12px;color:var(--ink-soft);font-size:14px}
        .safety-list b{color:var(--coral)}
        .faq-list{border-top:1px solid var(--line)}
        .faq-item{border-bottom:1px solid var(--line);padding:20px 0}
        .faq-item summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:20px}
        .faq-item summary::-webkit-details-marker{display:none}
        .faq-item summary:after{content:"+";color:var(--coral);font-size:22px;line-height:1}
        .faq-item[open] summary:after{content:"−"}
        .faq-item p{padding:13px 35px 0 0}
        .cta-band{background:var(--coral);color:#fff;padding:38px 42px;border-radius:var(--radius);display:flex;justify-content:space-between;align-items:center;gap:25px}
        .cta-band h2{margin:0;font-size:28px}
        .cta-band p{margin:7px 0 0;color:#ffe8e5;font-size:14px}
        .cta-band .button{background:var(--ink);color:#fff}
        .cta-band .button:hover{background:#302d42}
        footer{background:var(--ink);color:#fff;padding:62px 0 24px}
        .footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:35px;padding-bottom:48px}
        .footer-brand p{color:#bcb8c6;font-size:14px;max-width:290px;margin:17px 0 0}
        .footer-title{font-size:14px;font-weight:800;margin-bottom:15px;color:var(--mint)}
        .footer-links{display:grid;gap:8px}
        .footer-links a{font-size:13px;color:#c4c0cc}
        .footer-links a:hover{color:var(--coral)}
        .copyright{border-top:1px solid #393647;padding-top:20px;display:flex;justify-content:space-between;gap:20px;color:#9692a1;font-size:12px}
        :focus-visible{outline:3px solid var(--lemon);outline-offset:3px}
        @media(max-width:1024px){
            .nav-menu{gap:15px}
            .download-layout,.content-layout{grid-template-columns:1fr}
            .page-head-grid{grid-template-columns:1fr}
            .head-note{max-width:560px}
        }
        @media(max-width:768px){
            .container{width:min(var(--container),calc(100% - 32px))}
            .nav-wrap{height:68px}
            .nav-menu{display:none;position:absolute;left:16px;right:16px;top:74px;background:var(--white);padding:10px 20px 18px;border:1px solid var(--line);box-shadow:var(--shadow);flex-direction:column;align-items:stretch;gap:0}
            .nav-menu.open{display:flex}
            .nav-menu a{padding:10px 0}
            .nav-menu a:after{bottom:5px}
            .nav-cta{display:none}
            .menu-toggle{display:block}
            .page-head{padding:32px 0 40px}
            .section{padding:58px 0}
            .feature-grid,.spec-strip,.steps,.safety{grid-template-columns:1fr 1fr}
            .spec:nth-child(2){border-right:0}
            .spec:nth-child(-n+2){border-bottom:1px solid var(--line)}
            .step:nth-child(2){border-right:0}
            .step:nth-child(-n+2){border-bottom:1px solid var(--line)}
            .safety{gap:18px}
            .cta-band{align-items:flex-start;flex-direction:column;padding:30px}
            .footer-grid{grid-template-columns:1fr 1fr}
            .footer-brand{grid-column:1/-1}
            .copyright{flex-direction:column}
        }
        @media(max-width:520px){
            h1{font-size:36px}
            h2{font-size:27px}
            .feature-grid,.spec-strip,.steps,.safety{grid-template-columns:1fr}
            .spec,.step{border-right:0!important;border-bottom:1px solid var(--line)}
            .spec:last-child,.step:last-child{border-bottom:0}
            .download-panel{padding:28px 23px}
            .device-visual{padding:20px 12px;gap:12px}
            .phone{width:108px;height:190px}
            .qr-box{width:88px;height:88px}
            .update-item{grid-template-columns:1fr 25px;gap:5px 12px;padding:17px}
            .update-item .date,.update-item .badge{grid-column:1}
            .update-item h3{grid-column:1}
            .update-item p{grid-column:1}
            .update-item .arrow{grid-column:2;grid-row:1/4;align-self:center}
            .footer-grid{grid-template-columns:1fr}
        }

/* roulang page: category3 */
:root{
            --ink:#191827;
            --ink-soft:#403d50;
            --muted:#777383;
            --paper:#f6f3ee;
            --white:#fffdf9;
            --line:#e5dfd7;
            --coral:#ef6258;
            --coral-dark:#d94c48;
            --mint:#8ed8c8;
            --lemon:#f3db72;
            --radius:8px;
            --shadow:0 14px 34px rgba(25,24,39,.08);
            --container:1180px;
            --ease:all .25s ease;
        }
        *{box-sizing:border-box}
        html{scroll-behavior:smooth}
        body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans SC","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
        a{color:inherit;text-decoration:none;transition:var(--ease)}
        img,svg{display:block;max-width:100%}
        button,input{font:inherit}
        button{cursor:pointer}
        .container{width:min(var(--container),calc(100% - 48px));margin:auto}
        .site-header{background:rgba(255,253,249,.95);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(12px)}
        .nav-wrap{height:76px;display:flex;align-items:center;justify-content:space-between;gap:28px}
        .brand{display:flex;align-items:center;gap:11px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
        .brand-mark{width:36px;height:36px;border-radius:8px;background:var(--ink);display:grid;place-items:center;color:var(--mint);font-size:20px}
        .brand-text{font-size:17px}
        .nav-menu{display:flex;align-items:center;gap:25px;margin-left:auto}
        .nav-menu a{font-size:14px;color:var(--ink-soft);padding:25px 0;position:relative}
        .nav-menu a:after{content:"";position:absolute;left:0;right:100%;bottom:17px;height:2px;background:var(--coral);transition:var(--ease)}
        .nav-menu a:hover,.nav-menu a.active{color:var(--ink)}
        .nav-menu a:hover:after,.nav-menu a.active:after{right:0}
        .nav-cta,.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:6px;padding:11px 20px;font-weight:700;font-size:14px;transition:var(--ease)}
        .nav-cta,.button.primary{background:var(--coral);color:#fff}
        .nav-cta:hover,.button.primary:hover{background:var(--coral-dark);transform:translateY(-2px)}
        .button.secondary{background:transparent;border-color:var(--ink);color:var(--ink)}
        .button.secondary:hover{background:var(--ink);color:#fff}
        .menu-toggle{display:none;border:1px solid var(--line);background:var(--white);border-radius:6px;width:42px;height:40px;color:var(--ink);font-size:20px}
        .page-title{padding:48px 0 42px;background:var(--white);border-bottom:1px solid var(--line)}
        .breadcrumb{display:flex;gap:10px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:22px}
        .breadcrumb a:hover{color:var(--coral)}
        .breadcrumb span{color:#b3adb0}
        .title-row{display:flex;justify-content:space-between;align-items:end;gap:35px}
        .section-kicker{color:var(--coral);font-size:13px;font-weight:800;letter-spacing:.1em;margin-bottom:8px}
        h1,h2,h3,p{margin-top:0}
        h1{font-size:clamp(34px,5vw,52px);line-height:1.18;letter-spacing:-.03em;margin-bottom:14px}
        .title-row p{color:var(--muted);max-width:570px;margin-bottom:2px}
        .section{padding:76px 0}
        .section.compact{padding:56px 0}
        .section-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:30px}
        .section-head h2{font-size:30px;line-height:1.25;margin:0}
        .section-head p{color:var(--muted);max-width:550px;margin-bottom:0}
        .text-link{font-weight:700;color:var(--coral);white-space:nowrap}
        .text-link:hover{color:var(--coral-dark)}
        .intro-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:30px;align-items:stretch}
        .intro-copy{font-size:18px;color:var(--ink-soft);max-width:720px}
        .info-strip{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
        .info-box{padding:22px 20px;border-right:1px solid var(--line)}
        .info-box:last-child{border-right:0}
        .info-box strong{display:block;font-size:24px;color:var(--coral);line-height:1.2;margin-bottom:5px}
        .info-box span{font-size:13px;color:var(--muted)}
        .topic-board{background:var(--ink);color:#fff;padding:28px;border-radius:var(--radius);position:relative;overflow:hidden}
        .topic-board:after{content:"";position:absolute;width:170px;height:170px;border:1px solid rgba(142,216,200,.4);border-radius:50%;right:-52px;top:-65px}
        .topic-board h3{font-size:22px;margin-bottom:9px;position:relative;z-index:1}
        .topic-board p{font-size:14px;color:#c8c4d0;max-width:370px;position:relative;z-index:1}
        .topic-tags{display:flex;gap:8px;flex-wrap:wrap;position:relative;z-index:1}
        .badge{display:inline-flex;width:max-content;padding:3px 9px;background:#e5f5f1;color:#247668;border-radius:4px;font-size:12px;font-weight:700}
        .badge.dark{background:rgba(142,216,200,.15);color:var(--mint)}
        .news-shell{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
        .news-item{display:grid;grid-template-columns:110px 110px 1fr 35px;align-items:center;gap:18px;padding:22px 26px;border-bottom:1px solid var(--line)}
        .news-item:last-child{border-bottom:0}
        .news-date{font-size:13px;color:var(--muted)}
        .news-item h3{font-size:17px;margin:0 0 4px;line-height:1.4}
        .news-item p{font-size:13px;color:var(--muted);margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
        .news-item:hover{background:#fffaf4}
        .news-arrow{color:var(--coral);font-size:22px;text-align:right}
        .empty-state{padding:52px 25px;text-align:center;color:var(--muted)}
        .empty-state strong{display:block;color:var(--ink);font-size:19px;margin-bottom:6px}
        .feature-line{display:grid;grid-template-columns:1.15fr .85fr;gap:18px}
        .feature-main{background:var(--ink);color:#fff;padding:34px;min-height:230px;border-radius:var(--radius);display:flex;flex-direction:column;justify-content:end}
        .feature-main h3{font-size:28px;line-height:1.25;margin-bottom:10px}
        .feature-main p{color:#c4c0cc;margin:0;max-width:620px}
        .notice-list{border-left:3px solid var(--mint);padding-left:25px;display:grid;gap:18px}
        .notice-list div{border-bottom:1px solid var(--line);padding-bottom:15px}
        .notice-list div:last-child{border-bottom:0}
        .notice-list h3{font-size:17px;margin-bottom:4px}
        .notice-list p{font-size:14px;color:var(--muted);margin:0}
        .filter-bar{display:flex;align-items:center;justify-content:space-between;gap:18px;border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:22px}
        .filter-label{font-size:14px;font-weight:700}
        .filter-options{display:flex;gap:8px;flex-wrap:wrap}
        .filter-options button{border:1px solid var(--line);background:var(--white);color:var(--ink-soft);border-radius:5px;padding:7px 14px;font-size:13px;transition:var(--ease)}
        .filter-options button:hover,.filter-options button.active{background:var(--ink);border-color:var(--ink);color:#fff}
        .faq-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
        .faq-item{background:var(--white);border:1px solid var(--line);padding:22px;border-radius:var(--radius)}
        .faq-item strong{display:block;font-size:17px;line-height:1.4;margin-bottom:9px}
        .faq-item p{color:var(--muted);font-size:14px;margin:0}
        .cta-band{background:var(--coral);color:#fff;padding:34px 38px;border-radius:var(--radius);display:flex;align-items:center;justify-content:space-between;gap:25px}
        .cta-band h2{font-size:27px;margin:0 0 5px}
        .cta-band p{margin:0;color:#fff0ec}
        .cta-band .button{background:var(--ink);color:#fff}
        .cta-band .button:hover{background:#302d42;transform:translateY(-2px)}
        footer{background:var(--ink);color:#fff;padding:58px 0 25px}
        .footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:35px;padding-bottom:42px}
        .footer-brand p{color:#bdb9c6;font-size:14px;max-width:290px;margin:17px 0 0}
        .footer-title{font-size:14px;font-weight:800;color:var(--mint);margin-bottom:14px}
        .footer-links{display:grid;gap:7px}
        .footer-links a{color:#c6c2ce;font-size:13px}
        .footer-links a:hover{color:#fff}
        .copyright{border-top:1px solid #393646;padding-top:20px;display:flex;justify-content:space-between;gap:20px;color:#9995a5;font-size:12px}
        :focus-visible{outline:3px solid var(--lemon);outline-offset:3px}
        @media(max-width:1024px){
            .nav-menu{gap:15px}
            .title-row,.intro-grid,.feature-line{grid-template-columns:1fr;display:grid}
            .footer-grid{grid-template-columns:1.5fr 1fr 1fr}
        }
        @media(max-width:768px){
            .container{width:min(var(--container),calc(100% - 32px))}
            .nav-wrap{height:68px}
            .menu-toggle{display:block}
            .nav-menu{display:none;position:absolute;left:16px;right:16px;top:76px;background:var(--white);border:1px solid var(--line);padding:12px 20px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch;gap:0}
            .nav-menu.open{display:flex}
            .nav-menu a{padding:10px 0}
            .nav-menu a:after{bottom:5px}
            .nav-cta{display:none}
            .page-title{padding:36px 0}
            .section{padding:58px 0}
            .news-item{grid-template-columns:90px 90px 1fr 20px;gap:10px;padding:18px 15px}
            .news-item p{white-space:normal}
            .faq-grid{grid-template-columns:1fr}
            .footer-grid{grid-template-columns:1fr 1fr}
            .copyright{display:block}
            .copyright span{display:block;margin-top:6px}
        }
        @media(max-width:520px){
            h1{font-size:36px}
            .section-head{display:block}
            .section-head .text-link{display:inline-block;margin-top:15px}
            .info-strip{grid-template-columns:1fr}
            .info-box{border-right:0;border-bottom:1px solid var(--line)}
            .info-box:last-child{border-bottom:0}
            .news-item{grid-template-columns:1fr 22px}
            .news-date,.news-item .badge{display:inline-block}
            .news-item .badge{grid-column:1}
            .news-item h3,.news-item p{grid-column:1}
            .news-arrow{grid-column:2;grid-row:1 / span 3}
            .filter-bar{display:block}
            .filter-options{margin-top:12px}
            .cta-band{padding:27px 22px;display:block}
            .cta-band .button{margin-top:18px;width:100%}
            .footer-grid{grid-template-columns:1fr}
        }

/* roulang page: category4 */
:root{
            --ink:#191827;
            --ink-soft:#403d50;
            --muted:#777383;
            --paper:#f6f3ee;
            --white:#fffdf9;
            --line:#e5dfd7;
            --coral:#ef6258;
            --coral-dark:#d94c48;
            --mint:#8ed8c8;
            --lemon:#f3db72;
            --radius:8px;
            --shadow:0 14px 34px rgba(25,24,39,.08);
            --container:1180px;
            --ease:all .25s ease;
        }
        *{box-sizing:border-box}
        html{scroll-behavior:smooth}
        body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans SC","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
        a{color:inherit;text-decoration:none;transition:var(--ease)}
        a:focus-visible,button:focus-visible{outline:3px solid var(--lemon);outline-offset:3px}
        img,svg{display:block;max-width:100%}
        button,input{font:inherit}
        button{cursor:pointer}
        .container{width:min(var(--container),calc(100% - 48px));margin:auto}
        .site-header{background:rgba(255,253,249,.95);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(12px)}
        .nav-wrap{height:76px;display:flex;align-items:center;justify-content:space-between;gap:28px}
        .brand{display:flex;align-items:center;gap:11px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
        .brand-mark{width:36px;height:36px;border-radius:8px;background:var(--ink);display:grid;place-items:center;color:var(--mint);font-size:20px}
        .brand-text{font-size:17px}
        .nav-menu{display:flex;align-items:center;gap:25px;margin-left:auto}
        .nav-menu a{font-size:14px;color:var(--ink-soft);padding:25px 0;position:relative}
        .nav-menu a:after{content:"";position:absolute;left:0;right:100%;bottom:17px;height:2px;background:var(--coral);transition:var(--ease)}
        .nav-menu a:hover,.nav-menu a.active{color:var(--ink)}
        .nav-menu a:hover:after,.nav-menu a.active:after{right:0}
        .nav-cta,.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:6px;padding:11px 20px;font-weight:700;font-size:14px;transition:var(--ease)}
        .nav-cta,.button.primary{background:var(--coral);color:#fff}
        .nav-cta:hover,.button.primary:hover{background:var(--coral-dark);transform:translateY(-2px)}
        .button.secondary{color:var(--ink);border-color:var(--line);background:var(--white)}
        .button.secondary:hover{border-color:var(--coral);color:var(--coral);transform:translateY(-2px)}
        .menu-toggle{display:none;border:1px solid var(--line);background:var(--white);border-radius:6px;width:42px;height:40px;color:var(--ink);font-size:20px}
        .page-intro{padding:46px 0 58px;background:var(--white);border-bottom:1px solid var(--line)}
        .breadcrumb{display:flex;gap:10px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:25px}
        .breadcrumb a:hover{color:var(--coral)}
        .breadcrumb span{color:#b4ada5}
        .intro-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:55px;align-items:end}
        .section-kicker{color:var(--coral);font-size:13px;font-weight:800;letter-spacing:.1em;margin-bottom:9px}
        h1,h2,h3,p{margin-top:0}
        h1{font-size:clamp(38px,5vw,58px);line-height:1.15;letter-spacing:-.035em;margin-bottom:18px}
        .intro-copy{font-size:17px;color:var(--muted);max-width:720px;margin-bottom:0}
        .intro-note{border-left:3px solid var(--mint);padding:16px 0 16px 22px;color:var(--ink-soft);font-size:15px}
        .section{padding:82px 0}
        .section.compact{padding:62px 0}
        .section-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:30px}
        .section-head h2{font-size:32px;line-height:1.25;margin-bottom:7px}
        .section-head p{color:var(--muted);max-width:550px;margin-bottom:0}
        .topic-layout{display:grid;grid-template-columns:.75fr 1.25fr;gap:20px}
        .topic-panel{background:var(--ink);color:#fff;padding:30px;border-radius:var(--radius);min-height:260px;display:flex;flex-direction:column;justify-content:space-between}
        .topic-panel .mark{color:var(--mint);font-size:40px;font-weight:800;line-height:1}
        .topic-panel h2{font-size:25px;line-height:1.35;margin:25px 0 8px}
        .topic-panel p{color:#d1cdd8;margin-bottom:0;font-size:14px}
        .support-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
        .support-card{background:var(--white);border:1px solid var(--line);padding:24px;border-radius:var(--radius);transition:var(--ease)}
        .support-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#d4c9bd}
        .support-card .num{color:var(--coral);font-weight:800;font-size:13px;display:block;margin-bottom:12px}
        .support-card h3{font-size:19px;margin-bottom:7px}
        .support-card p{font-size:14px;color:var(--muted);margin-bottom:0}
        .guide-steps{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
        .step{padding:25px 22px;border-right:1px solid var(--line);min-height:175px}
        .step:last-child{border-right:0}
        .step strong{display:block;font-size:30px;color:var(--mint);line-height:1;margin-bottom:20px}
        .step h3{font-size:18px;margin-bottom:7px}
        .step p{font-size:14px;color:var(--muted);margin-bottom:0}
        .updates{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
        .update-item{display:grid;grid-template-columns:112px 120px 1fr 34px;align-items:center;gap:18px;padding:20px 25px;border-bottom:1px solid var(--line)}
        .update-item:last-child{border-bottom:0}
        .update-item:hover{background:#fffaf4}
        .update-date{font-size:13px;color:var(--muted)}
        .badge{display:inline-flex;width:max-content;padding:3px 9px;background:#e5f5f1;color:#247668;border-radius:4px;font-size:12px;font-weight:700}
        .update-item h3{font-size:16px;margin:0 0 3px}
        .update-item p{font-size:13px;color:var(--muted);margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
        .update-arrow{color:var(--coral);font-size:21px;text-align:right}
        .empty-state{padding:42px;text-align:center;color:var(--muted)}
        .empty-state strong{display:block;color:var(--ink);font-size:18px;margin-bottom:5px}
        .highlight{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:stretch}
        .highlight-copy{background:var(--mint);padding:34px;border-radius:var(--radius)}
        .highlight-copy h2{font-size:28px;line-height:1.3;margin-bottom:13px}
        .highlight-copy p{color:#315950;margin-bottom:0}
        .check-list{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:24px 28px;display:grid;gap:13px}
        .check-list div{display:flex;gap:12px;color:var(--ink-soft);font-size:15px}
        .check-list i{font-style:normal;color:var(--coral);font-weight:800}
        .faq-list{border-top:1px solid var(--line)}
        .faq-item{border-bottom:1px solid var(--line)}
        .faq-question{width:100%;display:flex;justify-content:space-between;align-items:center;border:0;background:transparent;padding:20px 3px;color:var(--ink);font-weight:700;text-align:left}
        .faq-question span:last-child{color:var(--coral);font-size:23px;transition:var(--ease)}
        .faq-answer{display:none;color:var(--muted);font-size:14px;padding:0 40px 20px 3px}
        .faq-item.open .faq-answer{display:block}
        .faq-item.open .faq-question span:last-child{transform:rotate(45deg)}
        .cta-band{background:var(--ink);color:#fff;padding:38px 42px;border-radius:var(--radius);display:flex;align-items:center;justify-content:space-between;gap:25px}
        .cta-band h2{font-size:27px;margin-bottom:7px}
        .cta-band p{color:#c8c4d0;margin-bottom:0}
        footer{background:var(--ink);color:#fff;padding:65px 0 24px;margin-top:0}
        .footer-grid{display:grid;grid-template-columns:1.6fr repeat(3,1fr);gap:35px;padding-bottom:52px}
        .footer-brand p{color:#aaa6b5;font-size:14px;max-width:285px;margin:18px 0 0}
        .footer-title{font-size:14px;font-weight:800;color:var(--mint);margin-bottom:15px}
        .footer-links{display:grid;gap:8px}
        .footer-links a{font-size:14px;color:#c3bfca}
        .footer-links a:hover{color:var(--coral)}
        .copyright{border-top:1px solid #393747;padding-top:20px;display:flex;justify-content:space-between;gap:18px;color:#9692a0;font-size:12px}
        .back-top{position:fixed;right:22px;bottom:22px;border:1px solid var(--line);background:var(--white);color:var(--ink);width:42px;height:42px;border-radius:6px;box-shadow:var(--shadow);font-size:18px}
        .back-top:hover{background:var(--coral);color:#fff;border-color:var(--coral)}
        @media(max-width:1024px){
            .nav-menu{gap:15px}
            .intro-grid{gap:30px}
            .update-item{grid-template-columns:90px 105px 1fr 25px}
        }
        @media(max-width:768px){
            .container{width:min(var(--container),calc(100% - 32px))}
            .nav-wrap{height:68px}
            .menu-toggle{display:block}
            .nav-cta{display:none}
            .nav-menu{display:none;position:absolute;left:0;right:0;top:68px;background:var(--white);border-bottom:1px solid var(--line);padding:8px 16px;flex-direction:column;align-items:stretch;gap:0;box-shadow:var(--shadow)}
            .nav-menu.open{display:flex}
            .nav-menu a{padding:12px 4px}
            .nav-menu a:after{bottom:6px}
            .intro-grid,.topic-layout,.highlight{grid-template-columns:1fr}
            .page-intro{padding:32px 0 42px}
            .section{padding:62px 0}
            .guide-steps{grid-template-columns:repeat(2,1fr)}
            .step:nth-child(2){border-right:0}
            .step:nth-child(-n+2){border-bottom:1px solid var(--line)}
            .update-item{grid-template-columns:85px 1fr 25px}
            .update-item .badge{grid-column:2;grid-row:1}
            .update-item h3{grid-column:2;grid-row:2}
            .update-item p{grid-column:2;grid-row:3}
            .update-date{grid-row:1 / span 3}
            .update-arrow{grid-column:3;grid-row:1 / span 3}
            .cta-band{align-items:flex-start;flex-direction:column;padding:30px 25px}
            .footer-grid{grid-template-columns:1fr 1fr}
            .footer-brand{grid-column:1 / -1}
            .copyright{flex-direction:column}
        }
        @media(max-width:520px){
            h1{font-size:36px}
            .section-head{display:block}
            .section-head h2{font-size:27px}
            .support-grid,.guide-steps{grid-template-columns:1fr}
            .step{border-right:0!important;border-bottom:1px solid var(--line)}
            .step:last-child{border-bottom:0}
            .update-item{padding:17px 15px;gap:10px}
            .update-date{font-size:12px}
            .footer-grid{grid-template-columns:1fr}
            .footer-brand{grid-column:auto}
            .button{width:100%}
        }