/* roulang page: index */
:root {
        --primary: #163B45;
        --primary-dark: #0E2C33;
        --primary-light: #235A66;
        --accent: #C59A5B;
        --accent-dark: #A87F42;
        --bg: #F4F3EF;
        --white: #FFFFFF;
        --text: #172A2D;
        --text-light: #4A5F63;
        --text-muted: #7C8F92;
        --border: #E1DDD4;
        --border-light: #EDEAE2;
        --success: #2E7D5A;
        --success-bg: #EAF4EE;
        --danger: #9B4A2F;
        --danger-bg: #F9EEE8;
        --shadow-sm: 0 2px 8px rgba(18,54,60,.05);
        --shadow-md: 0 6px 20px rgba(18,54,60,.06);
        --shadow-lg: 0 12px 28px rgba(18,54,60,.12);
        --radius-sm: 6px;
        --radius-md: 12px;
        --radius-lg: 16px;
        --radius-xl: 24px;
        --transition: .2s ease;
        --font-sans: "PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
        --font-num: "Inter","SF Pro Display",system-ui,sans-serif;
        --container: 1180px;
        --header-height: 64px;
    }

    *,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
    html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
    body{font-family:var(--font-sans);font-size:15px;line-height:1.8;color:var(--text);background:var(--bg);min-height:100vh}
    img{max-width:100%;height:auto;display:block}
    a{text-decoration:none;color:inherit;transition:color var(--transition)}
    ul,ol{list-style:none}
    button,input,select,textarea{font-family:inherit;font-size:inherit;line-height:inherit}
    button{cursor:pointer;border:none;background:none}
    table{border-collapse:collapse;width:100%}

    .container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}
    .section{padding:64px 0}
    .section--alt{background:var(--white)}
    .section--bg{background:var(--bg)}
    .section--dark{background:var(--primary);color:#E8EDED}
    .section--dark h2,.section--dark h3{color:#FFFFFF}
    .section-head{margin-bottom:40px}
    .section-head h2{font-size:26px;font-weight:700;line-height:1.35;color:var(--primary);margin-bottom:12px}
    .section-head p{font-size:15px;color:var(--text-light);max-width:720px}

    /* Header */
    .site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light);transition:box-shadow var(--transition)}
    .site-header.scrolled{box-shadow:0 4px 16px rgba(18,54,60,.08)}
    .site-header .container{display:flex;align-items:center;justify-content:space-between;height:var(--header-height)}
    .logo{font-size:19px;font-weight:700;color:var(--primary);letter-spacing:.01em;white-space:nowrap}
    .logo span{color:var(--accent)}
    .main-nav{display:flex;align-items:center;gap:28px}
    .main-nav a{font-size:14px;font-weight:500;color:var(--text);position:relative;padding:4px 0;white-space:nowrap}
    .main-nav a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--primary);transition:width var(--transition)}
    .main-nav a:hover::after,.main-nav a.active::after{width:100%}
    .main-nav a.active{color:var(--primary);font-weight:600}
    .header-cta{display:inline-flex;align-items:center;gap:6px;background:var(--accent);color:#fff;font-weight:600;font-size:14px;padding:9px 20px;border-radius:8px;transition:background var(--transition, box-shadow var(--transition));white-space:nowrap}
    .header-cta:hover{background:var(--accent-dark);box-shadow:0 4px 12px rgba(197,154,91,.3)}
    .header-cta:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
    .hamburger{display:none;flex-direction:column;gap:5px;padding:8px;border-radius:6px;transition:background var(--transition)}
    .hamburger:hover{background:var(--bg)}
    .hamburger span{display:block;width:24px;height:2px;background:var(--primary);border-radius:2px;transition:transform var(--transition),opacity var(--transition)}
    .hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .hamburger.open span:nth-child(2){opacity:0}
    .hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

    /* Mobile drawer */
    .drawer-overlay{position:fixed;inset:0;background:rgba(18,54,60,.5);z-index:98;opacity:0;pointer-events:none;transition:opacity var(--transition)}
    .drawer-overlay.active{opacity:1;pointer-events:auto}
    .drawer{position:fixed;top:0;right:-300px;width:280px;height:100vh;background:var(--white);z-index:99;padding:24px;display:flex;flex-direction:column;gap:20px;transition:right .3s ease;box-shadow:-8px 0 30px rgba(18,54,60,.12)}
    .drawer.active{right:0}
    .drawer-close{align-self:flex-end;font-size:28px;color:var(--text);padding:4px 8px;border-radius:6px;transition:background var(--transition)}
    .drawer-close:hover{background:var(--bg)}
    .drawer a{font-size:16px;font-weight:500;color:var(--text);padding:10px 0;border-bottom:1px solid var(--border-light)}
    .drawer a.active{color:var(--primary);font-weight:600}
    .drawer .header-cta{margin-top:8px;justify-content:center}

    /* Buttons */
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:15px;padding:13px 28px;border-radius:8px;transition:all var(--transition);text-align:center;cursor:pointer;border:2px solid transparent}
    .btn-primary{background:var(--primary);color:#fff}
    .btn-primary:hover{background:var(--primary-dark);box-shadow:0 6px 18px rgba(18,54,60,.25);transform:translateY(-1px)}
    .btn-accent{background:var(--accent);color:#fff}
    .btn-accent:hover{background:var(--accent-dark);box-shadow:0 6px 18px rgba(197,154,91,.3);transform:translateY(-1px)}
    .btn-outline{border-color:var(--primary);color:var(--primary);background:transparent}
    .btn-outline:hover{background:var(--primary);color:#fff}
    .btn-outline-light{border-color:rgba(255,255,255,.5);color:#fff;background:transparent}
    .btn-outline-light:hover{background:rgba(255,255,255,.1);border-color:#fff}
    .btn-lg{padding:16px 36px;font-size:16px}
    .btn-sm{padding:10px 18px;font-size:13px;border-radius:6px}
    .btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
    .text-link{font-size:14px;font-weight:500;color:var(--primary);display:inline-flex;align-items:center;gap:4px;transition:color var(--transition)}
    .text-link:hover{color:var(--accent)}
    .text-link::after{content:"→";transition:transform var(--transition)}
    .text-link:hover::after{transform:translateX(4px)}

    /* Badges & Tags */
    .badge{display:inline-flex;align-items:center;gap:4px;font-size:12px;font-weight:500;padding:4px 12px;border-radius:20px;background:var(--bg);color:var(--text-light);border:1px solid var(--border)}
    .badge--accent{background:#FBF6ED;color:var(--accent-dark);border-color:#E8D5B8}
    .badge--success{background:var(--success-bg);color:var(--success);border-color:#C6DFD0}
    .badge--danger{background:var(--danger-bg);color:var(--danger);border-color:#E8C5B8}
    .badge--dark{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.25)}

    /* Status bar */
    .status-bar{background:var(--white);border-bottom:1px solid var(--border-light);padding:10px 0}
    .status-bar .container{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px}
    .status-bar-left{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-light)}
    .status-dot{width:8px;height:8px;border-radius:50%;background:var(--success);display:inline-block}
    .status-bar-right{display:flex;align-items:center;gap:16px;font-size:13px;color:var(--text-light)}
    .status-bar-right span{display:flex;align-items:center;gap:4px}
    .status-bar-right strong{color:var(--primary);font-family:var(--font-num);font-weight:600}

    /* Hero */
    .hero{background:var(--primary);position:relative;overflow:hidden;color:#E8EDED;padding:72px 0}
    .hero::before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(22,59,69,.96) 0%,rgba(22,59,69,.88) 55%,rgba(22,59,69,.72) 100%)}
    .hero .container{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
    .hero-content h1{font-size:36px;font-weight:700;line-height:1.3;color:#fff;margin-bottom:20px;letter-spacing:.01em}
    .hero-content .hero-sub{font-size:16px;line-height:1.8;color:rgba(255,255,255,.82);margin-bottom:28px;max-width:520px}
    .hero-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:20px}
    .hero-version-badge{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:rgba(255,255,255,.75);padding:6px 14px;border:1px solid rgba(255,255,255,.25);border-radius:20px}
    .hero-image{position:relative;border-radius:var(--radius-lg);overflow:hidden;box-shadow:0 20px 50px rgba(0,0,0,.3)}
    .hero-image img{width:100%;height:420px;object-fit:cover;border-radius:var(--radius-lg)}
    .hero-image::after{content:"图片位：程序注入";position:absolute;bottom:12px;right:12px;font-size:11px;color:rgba(255,255,255,.7);background:rgba(18,54,60,.7);padding:2px 10px;border-radius:4px}

    /* Platform cards */
    .platform-grid{display:grid;grid-template-columns:1fr 1fr 1.2fr;gap:24px;margin-top:0}
    .platform-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:28px;box-shadow:var(--shadow-sm);transition:all var(--transition);display:flex;flex-direction:column;gap:16px}
    .platform-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px);border-color:var(--primary-light)}
    .platform-card .platform-icon{width:48px;height:48px;border-radius:12px;background:var(--primary);display:flex;align-items:center;justify-content:center;font-size:22px;color:#fff;flex-shrink:0}
    .platform-card h3{font-size:18px;font-weight:600;color:var(--primary)}
    .platform-card p{font-size:13px;color:var(--text-light);line-height:1.7}
    .platform-card .platform-meta{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--text-muted)}
    .platform-card .platform-meta span{display:flex;justify-content:space-between;padding:6px 0;border-bottom:1px dashed var(--border)}
    .platform-card .btn{margin-top:auto}

    /* Trust data strip */
    .trust-strip{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:32px;box-shadow:var(--shadow-sm)}
    .trust-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
    .trust-item{display:flex;flex-direction:column;gap:6px}
    .trust-item .trust-num{font-size:28px;font-weight:700;color:var(--primary);font-family:var(--font-num);line-height:1.2}
    .trust-item .trust-label{font-size:13px;color:var(--text-muted)}

    /* Steps timeline */
    .steps-timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;position:relative}
    .steps-timeline::before{content:"";position:absolute;top:28px;left:calc(12.5% + 14px);right:calc(12.5% + 14px);height:2px;background:var(--border);z-index:0}
    .step-item{text-align:center;position:relative;z-index:1}
    .step-num{width:56px;height:56px;border-radius:50%;background:var(--primary);color:#fff;font-size:20px;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 14px;font-family:var(--font-num)}
    .step-item h3{font-size:16px;font-weight:600;color:var(--primary);margin-bottom:6px}
    .step-item p{font-size:13px;color:var(--text-light);line-height:1.6}

    /* Version update */
    .version-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:32px;align-items:start}
    .version-main{background:var(--white);border-radius:var(--radius-md);padding:28px;border:1px solid var(--border);box-shadow:var(--shadow-sm)}
    .version-main h3{font-size:20px;font-weight:600;color:var(--primary);margin-bottom:8px}
    .version-main .version-tag{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--accent-dark);background:#FBF6ED;padding:4px 12px;border-radius:20px;margin-bottom:12px}
    .version-main p{font-size:14px;color:var(--text-light);line-height:1.7}
    .update-list{display:flex;flex-direction:column;gap:12px}
    .update-item{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-sm);padding:18px 20px;display:flex;align-items:center;gap:14px;box-shadow:var(--shadow-sm);transition:all var(--transition)}
    .update-item:hover{box-shadow:var(--shadow-md);border-color:var(--border)}
    .update-item .update-ver{font-size:13px;font-weight:600;color:var(--primary);background:var(--bg);padding:4px 10px;border-radius:4px;white-space:nowrap;font-family:var(--font-num)}
    .update-item .update-desc{font-size:14px;color:var(--text-light);flex:1}
    .update-item .update-date{font-size:12px;color:var(--text-muted);white-space:nowrap}

    /* Features */
    .features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
    .feature-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:24px;text-align:center;box-shadow:var(--shadow-sm);transition:all var(--transition)}
    .feature-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
    .feature-card .feature-icon{width:52px;height:52px;border-radius:12px;background:var(--bg);display:flex;align-items:center;justify-content:center;font-size:24px;margin:0 auto 14px}
    .feature-card h3{font-size:16px;font-weight:600;color:var(--primary);margin-bottom:8px}
    .feature-card p{font-size:13px;color:var(--text-light);line-height:1.7}

    /* Account service */
    .account-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center}
    .account-info h2{font-size:24px;font-weight:700;color:var(--primary);margin-bottom:14px}
    .account-info p{font-size:15px;color:var(--text-light);line-height:1.8;margin-bottom:20px}
    .account-cards{display:grid;grid-template-columns:1fr 1fr;gap:20px}
    .account-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:24px;text-align:center;box-shadow:var(--shadow-sm);transition:all var(--transition)}
    .account-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
    .account-card .ac-icon{font-size:32px;margin-bottom:12px}
    .account-card h3{font-size:17px;font-weight:600;color:var(--primary);margin-bottom:8px}
    .account-card p{font-size:13px;color:var(--text-light);margin-bottom:14px}
    .account-card .btn{width:100%}

    /* Security */
    .security-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
    .security-item{text-align:center;padding:24px}
    .security-item .sec-icon{width:56px;height:56px;border-radius:50%;background:rgba(255,255,255,.1);display:flex;align-items:center;justify-content:center;font-size:26px;margin:0 auto 14px;border:1px solid rgba(255,255,255,.2)}
    .security-item h3{font-size:16px;font-weight:600;color:#fff;margin-bottom:6px}
    .security-item p{font-size:13px;color:rgba(255,255,255,.7);line-height:1.6}

    /* News list */
    .news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
    .news-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm);transition:all var(--transition);display:flex;flex-direction:column}
    .news-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
    .news-card .news-img{width:100%;height:180px;object-fit:cover;background:var(--bg)}
    .news-card .news-body{padding:20px;flex:1;display:flex;flex-direction:column;gap:10px}
    .news-card .news-category{display:inline-flex;font-size:12px;font-weight:500;color:var(--primary);background:var(--bg);padding:2px 10px;border-radius:4px;align-self:flex-start}
    .news-card h3{font-size:16px;font-weight:600;color:var(--primary);line-height:1.5}
    .news-card h3 a{color:inherit}
    .news-card h3 a:hover{color:var(--accent-dark)}
    .news-card .news-excerpt{font-size:13px;color:var(--text-light);line-height:1.7;flex:1}
    .news-card .news-meta{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--text-muted)}
    .empty-state{text-align:center;padding:48px 20px;font-size:15px;color:var(--text-muted);background:var(--white);border:1px dashed var(--border);border-radius:var(--radius-md)}

    /* Tutorial entry */
    .tutorial-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
    .tutorial-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm);transition:all var(--transition)}
    .tutorial-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
    .tutorial-card img{width:100%;height:160px;object-fit:cover}
    .tutorial-card .tutorial-body{padding:20px}
    .tutorial-card h3{font-size:16px;font-weight:600;color:var(--primary);margin-bottom:8px}
    .tutorial-card p{font-size:13px;color:var(--text-light);line-height:1.7;margin-bottom:14px}

    /* FAQ */
    .faq-list{display:flex;flex-direction:column;gap:12px;max-width:860px;margin:0 auto}
    .faq-item{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;transition:all var(--transition)}
    .faq-item.open{border-color:var(--primary);box-shadow:var(--shadow-md)}
    .faq-question{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px;cursor:pointer;font-size:15px;font-weight:600;color:var(--text);transition:color var(--transition);width:100%;text-align:left}
    .faq-question:hover{color:var(--primary)}
    .faq-question .faq-icon{width:28px;height:28px;border-radius:50%;background:var(--bg);display:flex;align-items:center;justify-content:center;font-size:18px;transition:transform var(--transition);flex-shrink:0}
    .faq-item.open .faq-icon{transform:rotate(45deg);background:var(--primary);color:#fff}
    .faq-answer{max-height:0;overflow:hidden;transition:max-height .3s ease}
    .faq-answer-inner{padding:0 22px 20px;font-size:14px;color:var(--text-light);line-height:1.8;background:var(--bg);margin:0 12px 12px;border-radius:6px}

    /* Version compare table */
    .table-wrap{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm)}
    .version-table{width:100%;border-collapse:collapse;font-size:13px}
    .version-table th{background:var(--primary);color:#fff;font-weight:600;padding:14px 18px;text-align:left}
    .version-table td{padding:14px 18px;border-bottom:1px solid var(--border-light);color:var(--text-light)}
    .version-table tr:last-child td{border-bottom:none}
    .version-table tr:hover td{background:#FAFAF7}
    .version-table .highlight-col{background:#FBF6ED;font-weight:600;color:var(--primary)}
    .table-scroll{overflow-x:auto}

    /* User feedback */
    .feedback-scroll{display:flex;gap:20px;overflow-x:auto;padding-bottom:12px;scroll-snap-type:x mandatory}
    .feedback-scroll::-webkit-scrollbar{height:6px}
    .feedback-scroll::-webkit-scrollbar-track{background:var(--bg);border-radius:3px}
    .feedback-scroll::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
    .feedback-card{min-width:320px;max-width:380px;scroll-snap-align:start;background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:22px;box-shadow:var(--shadow-sm)}
    .feedback-card .fb-tag{display:inline-block;font-size:12px;font-weight:500;color:var(--success);background:var(--success-bg);padding:2px 10px;border-radius:4px;margin-bottom:10px}
    .feedback-card .fb-text{font-size:14px;color:var(--text);line-height:1.7;margin-bottom:14px}
    .feedback-card .fb-user{font-size:13px;color:var(--text-muted);display:flex;align-items:center;gap:8px}
    .feedback-card .fb-user::before{content:"";width:32px;height:32px;border-radius:50%;background:var(--bg);flex-shrink:0}

    /* Final CTA */
    .final-cta{background:var(--primary);padding:56px 0;text-align:center;color:#E8EDED}
    .final-cta h2{font-size:26px;font-weight:700;color:#fff;margin-bottom:14px}
    .final-cta p{font-size:15px;color:rgba(255,255,255,.78);margin-bottom:28px}
    .final-cta .cta-actions{display:flex;align-items:center;justify-content:center;gap:20px;flex-wrap:wrap}

    /* Risk notice */
    .risk-notice{background:#E8E5DE;padding:24px 0}
    .risk-notice p{font-size:12px;color:var(--text-muted);line-height:1.7;max-width:980px;margin:0 auto;text-align:center}

    /* Footer */
    .site-footer{background:var(--primary-dark);color:#C5D0D2;padding:56px 0 24px}
    .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
    .footer-logo{font-size:20px;font-weight:700;color:#fff;margin-bottom:12px;display:block}
    .footer-logo span{color:var(--accent)}
    .footer-desc{font-size:13px;color:#9AABAD;line-height:1.7;max-width:300px}
    .footer-col h3{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px}
    .footer-col a{display:block;font-size:13px;color:#9AABAD;padding:5px 0;transition:color var(--transition)}
    .footer-col a:hover{color:#fff}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:20px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}
    .footer-bottom p{font-size:12px;color:#7C8F92}
    .footer-bottom a{color:#9AABAD;font-size:12px}
    .footer-bottom a:hover{color:#fff}

    /* Responsive */
    @media (max-width:1024px){
        .hero .container{grid-template-columns:1fr;gap:36px}
        .hero-image img{height:320px}
        .features-grid{grid-template-columns:repeat(2,1fr)}
        .security-grid{grid-template-columns:repeat(2,1fr)}
        .news-grid{grid-template-columns:repeat(2,1fr)}
        .platform-grid{grid-template-columns:1fr 1fr}
        .version-grid{grid-template-columns:1fr}
        .steps-timeline{grid-template-columns:repeat(2,1fr)}
        .steps-timeline::before{display:none}
        .footer-grid{grid-template-columns:1fr 1fr}
    }
    @media (max-width:768px){
        .main-nav{display:none}
        .hamburger{display:flex}
        .header-cta{display:none}
        .section{padding:40px 0}
        .section-head h2{font-size:22px}
        .hero{padding:48px 0}
        .hero-content h1{font-size:28px}
        .hero-actions{flex-direction:column;align-items:stretch}
        .hero-actions .btn{width:100%}
        .trust-grid{grid-template-columns:repeat(2,1fr);gap:16px}
        .platform-grid{grid-template-columns:1fr}
        .features-grid{grid-template-columns:1fr}
        .security-grid{grid-template-columns:1fr 1fr;gap:16px}
        .news-grid{grid-template-columns:1fr}
        .tutorial-grid{grid-template-columns:1fr}
        .account-grid{grid-template-columns:1fr}
        .account-cards{grid-template-columns:1fr}
        .steps-timeline{grid-template-columns:1fr}
        .footer-grid{grid-template-columns:1fr;gap:24px}
        .footer-bottom{flex-direction:column;text-align:center}
        .status-bar .container{justify-content:center;text-align:center}
        .status-bar-right{gap:10px}
    }
    @media (max-width:520px){
        .hero-content h1{font-size:24px}
        .hero-image img{height:240px}
        .security-grid{grid-template-columns:1fr}
        .trust-grid{grid-template-columns:1fr 1fr}
        .btn-lg{padding:14px 24px;font-size:14px}
        .version-table{font-size:12px}
        .version-table th,.version-table td{padding:10px 12px}
        .feedback-card{min-width:280px}
    }

/* roulang page: article */
:root {
        --primary: #163B45;
        --primary-dark: #0E2C33;
        --primary-light: #235A66;
        --accent: #C59A5B;
        --accent-dark: #A87F42;
        --bg: #F4F3EF;
        --white: #FFFFFF;
        --text: #172A2D;
        --text-light: #4A5F63;
        --text-muted: #7C8F92;
        --border: #E1DDD4;
        --border-light: #EDEAE2;
        --success: #2E7D5A;
        --success-bg: #EAF4EE;
        --danger: #9B4A2F;
        --danger-bg: #F9EEE8;
        --shadow-sm: 0 2px 8px rgba(18,54,60,.05);
        --shadow-md: 0 6px 20px rgba(18,54,60,.06);
        --shadow-lg: 0 12px 28px rgba(18,54,60,.12);
        --radius-sm: 6px;
        --radius-md: 12px;
        --radius-lg: 16px;
        --radius-xl: 24px;
        --transition: .2s ease;
        --font-sans: "PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
        --font-num: "Inter","SF Pro Display",system-ui,sans-serif;
        --container: 1180px;
        --header-height: 64px;
    }
    *,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
    html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
    body{font-family:var(--font-sans);font-size:15px;line-height:1.8;color:var(--text);background:var(--bg);min-height:100vh}
    img{max-width:100%;height:auto;display:block}
    a{text-decoration:none;color:inherit;transition:color var(--transition)}
    button,input,select,textarea{font-family:inherit;font-size:inherit;line-height:inherit}
    button{cursor:pointer;border:none;background:none}
    ul,ol{list-style:none}
    .container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}
    .section{padding:64px 0}
    .section--alt{background:var(--white)}
    .section--bg{background:var(--bg)}
    .section--dark{background:var(--primary);color:#E8EDED}
    .section--dark h2,.section--dark h3{color:#FFFFFF}
    .section-head{margin-bottom:40px}
    .section-head h2{font-size:26px;font-weight:700;line-height:1.35;color:var(--primary);margin-bottom:12px}
    .section-head p{font-size:15px;color:var(--text-light);max-width:720px}

    /* Header */
    .site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light);transition:box-shadow var(--transition)}
    .site-header.scrolled{box-shadow:0 4px 16px rgba(18,54,60,.08)}
    .site-header .container{display:flex;align-items:center;justify-content:space-between;height:var(--header-height)}
    .logo{font-size:19px;font-weight:700;color:var(--primary);letter-spacing:.01em;white-space:nowrap}
    .logo span{color:var(--accent)}
    .main-nav{display:flex;align-items:center;gap:28px}
    .main-nav a{font-size:14px;font-weight:500;color:var(--text);position:relative;padding:4px 0;white-space:nowrap}
    .main-nav a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--primary);transition:width var(--transition)}
    .main-nav a:hover::after,.main-nav a.active::after{width:100%}
    .main-nav a.active{color:var(--primary);font-weight:600}
    .header-cta{display:inline-flex;align-items:center;gap:6px;background:var(--accent);color:#fff;font-weight:600;font-size:14px;padding:9px 20px;border-radius:8px;transition:background var(--transition),box-shadow var(--transition);white-space:nowrap}
    .header-cta:hover{background:var(--accent-dark);box-shadow:0 4px 12px rgba(197,154,91,.3)}
    .header-cta:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
    .hamburger{display:none;flex-direction:column;gap:5px;padding:8px;border-radius:6px;transition:background var(--transition)}
    .hamburger:hover{background:var(--bg)}
    .hamburger span{display:block;width:24px;height:2px;background:var(--primary);border-radius:2px;transition:transform var(--transition),opacity var(--transition)}
    .hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .hamburger.open span:nth-child(2){opacity:0}
    .hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

    /* Drawer */
    .drawer-overlay{position:fixed;inset:0;background:rgba(18,54,60,.5);z-index:98;opacity:0;pointer-events:none;transition:opacity var(--transition)}
    .drawer-overlay.active{opacity:1;pointer-events:auto}
    .drawer{position:fixed;top:0;right:-300px;width:280px;height:100vh;background:var(--white);z-index:99;padding:24px;display:flex;flex-direction:column;gap:20px;transition:right .3s ease;box-shadow:-8px 0 30px rgba(18,54,60,.12)}
    .drawer.active{right:0}
    .drawer-close{align-self:flex-end;font-size:28px;color:var(--text);padding:4px 8px;border-radius:6px;transition:background var(--transition)}
    .drawer-close:hover{background:var(--bg)}
    .drawer a{font-size:16px;font-weight:500;color:var(--text);padding:10px 0;border-bottom:1px solid var(--border-light)}
    .drawer a.active{color:var(--primary);font-weight:600}
    .drawer .header-cta{margin-top:8px;justify-content:center}

    /* Buttons */
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:15px;padding:13px 28px;border-radius:8px;transition:all var(--transition);text-align:center;cursor:pointer;border:2px solid transparent}
    .btn-primary{background:var(--primary);color:#fff}
    .btn-primary:hover{background:var(--primary-dark);box-shadow:0 6px 18px rgba(18,54,60,.25);transform:translateY(-1px)}
    .btn-accent{background:var(--accent);color:#fff}
    .btn-accent:hover{background:var(--accent-dark);box-shadow:0 6px 18px rgba(197,154,91,.3);transform:translateY(-1px)}
    .btn-outline{border-color:var(--primary);color:var(--primary);background:transparent}
    .btn-outline:hover{background:var(--primary);color:#fff}
    .btn-lg{padding:16px 36px;font-size:16px}
    .btn-sm{padding:10px 18px;font-size:13px;border-radius:6px}
    .btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
    .text-link{font-size:14px;font-weight:500;color:var(--primary);display:inline-flex;align-items:center;gap:4px;transition:color var(--transition)}
    .text-link:hover{color:var(--primary-light)}

    /* Badge */
    .badge{display:inline-flex;align-items:center;gap:4px;font-size:12px;font-weight:500;padding:4px 12px;border-radius:20px;border:1px solid var(--border);color:var(--text-light);background:var(--white);white-space:nowrap}
    .badge--primary{background:var(--primary);color:#fff;border-color:var(--primary)}
    .badge--accent{background:var(--accent);color:#fff;border-color:var(--accent)}
    .badge--success{background:var(--success-bg);color:var(--success);border-color:#C4DCCE}
    .badge--danger{background:var(--danger-bg);color:var(--danger);border-color:#E5C4B5}

    /* Breadcrumb */
    .breadcrumb-section{background:var(--white);border-bottom:1px solid var(--border-light);padding:20px 0}
    .breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--text-muted)}
    .breadcrumb a{color:var(--text-light);transition:color var(--transition)}
    .breadcrumb a:hover{color:var(--primary)}
    .breadcrumb span{color:var(--text-muted)}
    .breadcrumb .current{color:var(--primary);font-weight:500;max-width:400px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

    /* Article Header */
    .article-header{padding:48px 0 32px;background:var(--white)}
    .article-header h1{font-size:32px;font-weight:700;line-height:1.4;color:var(--primary);margin-bottom:20px}
    .article-header .meta{display:flex;align-items:center;flex-wrap:wrap;gap:16px;font-size:13px;color:var(--text-muted)}
    .article-header .meta .dot{width:4px;height:4px;background:var(--border);border-radius:50%}

    /* Article Content */
    .article-content-section{background:var(--white);padding:0 0 64px}
    .article-content{max-width:780px;margin:0 auto;font-size:15px;line-height:1.9;color:var(--text)}
    .article-content h2{font-size:22px;font-weight:700;color:var(--primary);margin:40px 0 16px;line-height:1.4}
    .article-content h3{font-size:18px;font-weight:600;color:var(--primary);margin:28px 0 12px;line-height:1.5}
    .article-content p{margin-bottom:16px;color:var(--text)}
    .article-content ul,.article-content ol{margin:0 0 20px 20px}
    .article-content ul{list-style:disc}
    .article-content ol{list-style:decimal}
    .article-content li{margin-bottom:8px;color:var(--text)}
    .article-content blockquote{margin:24px 0;padding:16px 20px;background:var(--bg);border-left:3px solid var(--accent);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--text-light)}
    .article-content code{display:inline-block;background:var(--bg);border:1px solid var(--border-light);border-radius:4px;padding:2px 8px;font-family:"SF Mono",Consolas,monospace;font-size:13px;color:var(--primary)}
    .article-content img{border-radius:var(--radius-md);margin:20px 0}
    .article-content .no-article{padding:60px 20px;text-align:center;background:var(--bg);border-radius:var(--radius-lg)}

    /* Article Callout Card */
    .article-callout{margin:32px auto;max-width:780px}
    .callout-card{background:var(--bg);border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:28px 32px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
    .callout-card .callout-text{flex:1;min-width:280px}
    .callout-card .callout-text h3{font-size:18px;font-weight:700;color:var(--primary);margin-bottom:8px}
    .callout-card .callout-text p{font-size:14px;color:var(--text-light);line-height:1.7}

    /* Related Articles */
    .related-section{background:var(--bg)}
    .related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
    .related-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm);transition:all var(--transition);display:flex;flex-direction:column}
    .related-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
    .related-card img{width:100%;height:180px;object-fit:cover;border-bottom:1px solid var(--border-light)}
    .related-card .card-body{padding:20px 22px;display:flex;flex-direction:column;flex:1}
    .related-card .card-tag{font-size:12px;color:var(--accent-dark);font-weight:600;margin-bottom:8px}
    .related-card h3{font-size:16px;font-weight:600;color:var(--primary);line-height:1.5;margin-bottom:8px}
    .related-card p{font-size:13px;color:var(--text-light);line-height:1.6;margin-bottom:12px;flex:1}
    .related-card .card-meta{font-size:12px;color:var(--text-muted);display:flex;align-items:center;gap:8px}

    /* Prev Next Nav */
    .prev-next-nav{padding:0 0 64px;background:var(--bg)}
    .prev-next-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;max-width:780px;margin:0 auto}
    .prev-next-item{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:18px 22px;transition:all var(--transition);display:block}
    .prev-next-item:hover{box-shadow:var(--shadow-md);border-color:var(--primary-light)}
    .prev-next-item .pn-label{font-size:12px;color:var(--text-muted);margin-bottom:6px}
    .prev-next-item .pn-title{font-size:14px;font-weight:600;color:var(--primary);line-height:1.5}
    .prev-next-item.prev{text-align:left}
    .prev-next-item.next{text-align:right}

    /* CTA Section */
    .article-cta{background:var(--primary);padding:64px 0;text-align:center}
    .article-cta h2{font-size:26px;font-weight:700;color:#fff;margin-bottom:12px}
    .article-cta p{font-size:15px;color:#B8C8CB;max-width:560px;margin:0 auto 28px}
    .article-cta .btn-group{display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap}

    /* Risk Disclaimer */
    .risk-disclaimer{background:var(--bg);padding:32px 0;border-top:1px solid var(--border-light)}
    .risk-card{background:var(--white);border:1px solid var(--border);border-left:3px solid var(--danger);border-radius:var(--radius-md);padding:22px 26px}
    .risk-card h3{font-size:15px;font-weight:700;color:var(--danger);margin-bottom:8px}
    .risk-card p{font-size:13px;color:var(--text-light);line-height:1.7}

    /* Footer */
    .site-footer{background:var(--primary-dark);color:#D5E0E2;padding:56px 0 0}
    .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px}
    .footer-logo{font-size:18px;font-weight:700;color:#fff;margin-bottom:12px;display:block}
    .footer-logo span{color:var(--accent)}
    .footer-desc{font-size:13px;color:#A0B4B8;line-height:1.7;max-width:300px}
    .footer-col h3{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px}
    .footer-col a{display:block;font-size:13px;color:#A0B4B8;padding:6px 0;transition:color var(--transition)}
    .footer-col a:hover{color:var(--accent)}
    .footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;padding:20px 0;border-top:1px solid rgba(255,255,255,.08);font-size:12px;color:#7C8F92}
    .footer-bottom a{color:#7C8F92;transition:color var(--transition)}
    .footer-bottom a:hover{color:var(--accent)}

    /* Responsive */
    @media (max-width:1024px){
        .main-nav{gap:18px}
        .related-grid{grid-template-columns:repeat(2,1fr)}
        .footer-grid{grid-template-columns:repeat(2,1fr);gap:28px}
    }
    @media (max-width:768px){
        .main-nav{display:none}
        .header-cta{display:none}
        .hamburger{display:flex}
        .section{padding:40px 0}
        .article-header h1{font-size:24px}
        .article-header{padding:36px 0 24px}
        .article-content-section{padding:0 0 40px}
        .related-grid{grid-template-columns:1fr}
        .prev-next-grid{grid-template-columns:1fr}
        .prev-next-item.next{text-align:left}
        .callout-card{padding:20px;flex-direction:column;align-items:flex-start}
        .footer-grid{grid-template-columns:1fr;gap:24px}
        .article-cta{padding:48px 0}
        .article-cta h2{font-size:22px}
    }
    @media (max-width:520px){
        .container{padding:0 14px}
        .article-header h1{font-size:20px}
        .article-header .meta{flex-direction:column;align-items:flex-start;gap:8px}
        .article-header .meta .dot{display:none}
        .article-content{font-size:14px}
        .article-content h2{font-size:19px}
        .article-content h3{font-size:16px}
        .callout-card{padding:16px}
        .related-card img{height:150px}
        .btn-lg{padding:14px 24px;font-size:14px}
    }

/* roulang page: category1 */
:root {
        --primary: #163B45;
        --primary-dark: #0E2C33;
        --primary-light: #235A66;
        --accent: #C59A5B;
        --accent-dark: #A87F42;
        --bg: #F4F3EF;
        --white: #FFFFFF;
        --text: #172A2D;
        --text-light: #4A5F63;
        --text-muted: #7C8F92;
        --border: #E1DDD4;
        --border-light: #EDEAE2;
        --success: #2E7D5A;
        --success-bg: #EAF4EE;
        --danger: #9B4A2F;
        --danger-bg: #F9EEE8;
        --shadow-sm: 0 2px 8px rgba(18,54,60,.05);
        --shadow-md: 0 6px 20px rgba(18,54,60,.06);
        --shadow-lg: 0 12px 28px rgba(18,54,60,.12);
        --radius-sm: 6px;
        --radius-md: 12px;
        --radius-lg: 16px;
        --radius-xl: 24px;
        --transition: .2s ease;
        --font-sans: "PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
        --font-num: "Inter","SF Pro Display",system-ui,sans-serif;
        --container: 1180px;
        --header-height: 64px;
    }
    html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
    body{font-family:var(--font-sans);font-size:15px;line-height:1.8;color:var(--text);background:var(--bg);min-height:100vh;-webkit-font-smoothing:antialiased}
    img{max-width:100%;height:auto;display:block}
    a{text-decoration:none;color:inherit;transition:color var(--transition)}
    button,input,select,textarea{font-family:inherit;font-size:inherit;line-height:inherit}
    button{cursor:pointer;border:none;background:none}
    .container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}
    .section{padding:64px 0}
    .section--alt{background:var(--white)}
    .section--bg{background:var(--bg)}
    .section--dark{background:var(--primary);color:#E8EDED}
    .section--dark h2,.section--dark h3{color:#FFFFFF}
    .section-head{margin-bottom:40px}
    .section-head h2{font-size:26px;font-weight:700;line-height:1.35;color:var(--primary);margin-bottom:12px}
    .section-head p{font-size:15px;color:var(--text-light);max-width:720px}

    /* Header */
    .site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light);transition:box-shadow var(--transition)}
    .site-header.scrolled{box-shadow:0 4px 16px rgba(18,54,60,.08)}
    .site-header .container{display:flex;align-items:center;justify-content:space-between;height:var(--header-height)}
    .logo{font-size:19px;font-weight:700;color:var(--primary);letter-spacing:.01em;white-space:nowrap}
    .logo span{color:var(--accent)}
    .main-nav{display:flex;align-items:center;gap:28px}
    .main-nav a{font-size:14px;font-weight:500;color:var(--text);position:relative;padding:4px 0;white-space:nowrap}
    .main-nav a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--primary);transition:width var(--transition)}
    .main-nav a:hover::after,.main-nav a.active::after{width:100%}
    .main-nav a.active{color:var(--primary);font-weight:600}
    .header-cta{display:inline-flex;align-items:center;gap:6px;background:var(--accent);color:#fff;font-weight:600;font-size:14px;padding:9px 20px;border-radius:8px;transition:background var(--transition),box-shadow var(--transition);white-space:nowrap}
    .header-cta:hover{background:var(--accent-dark);box-shadow:0 4px 12px rgba(197,154,91,.3);color:#fff}
    .header-cta:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
    .hamburger{display:none;flex-direction:column;gap:5px;padding:8px;border-radius:6px;transition:background var(--transition)}
    .hamburger:hover{background:var(--bg)}
    .hamburger span{display:block;width:24px;height:2px;background:var(--primary);border-radius:2px;transition:transform var(--transition),opacity var(--transition)}
    .hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .hamburger.open span:nth-child(2){opacity:0}
    .hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

    /* Mobile drawer */
    .drawer-overlay{position:fixed;inset:0;background:rgba(18,54,60,.5);z-index:98;opacity:0;pointer-events:none;transition:opacity var(--transition)}
    .drawer-overlay.active{opacity:1;pointer-events:auto}
    .drawer{position:fixed;top:0;right:-300px;width:280px;height:100vh;background:var(--white);z-index:99;padding:24px;display:flex;flex-direction:column;gap:20px;transition:right .3s ease;box-shadow:-8px 0 30px rgba(18,54,60,.12)}
    .drawer.active{right:0}
    .drawer-close{align-self:flex-end;font-size:28px;color:var(--text);padding:4px 8px;border-radius:6px;transition:background var(--transition)}
    .drawer-close:hover{background:var(--bg)}
    .drawer a{font-size:16px;font-weight:500;color:var(--text);padding:10px 0;border-bottom:1px solid var(--border-light)}
    .drawer a.active{color:var(--primary);font-weight:600}
    .drawer .header-cta{margin-top:8px;justify-content:center}

    /* Buttons */
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:15px;padding:13px 28px;border-radius:8px;transition:all var(--transition);text-align:center;cursor:pointer;border:2px solid transparent}
    .btn-primary{background:var(--primary);color:#fff}
    .btn-primary:hover{background:var(--primary-dark);box-shadow:0 6px 18px rgba(18,54,60,.25);transform:translateY(-1px);color:#fff}
    .btn-accent{background:var(--accent);color:#fff}
    .btn-accent:hover{background:var(--accent-dark);box-shadow:0 6px 18px rgba(197,154,91,.3);transform:translateY(-1px);color:#fff}
    .btn-outline{border-color:var(--primary);color:var(--primary);background:transparent}
    .btn-outline:hover{background:var(--primary);color:#fff}
    .btn-outline-light{border-color:rgba(255,255,255,.5);color:#fff;background:transparent}
    .btn-outline-light:hover{background:rgba(255,255,255,.1);border-color:#fff;color:#fff}
    .btn-lg{padding:16px 36px;font-size:16px}
    .btn-sm{padding:10px 18px;font-size:13px;border-radius:6px}
    .btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
    .text-link{font-size:14px;font-weight:500;color:var(--primary);display:inline-flex;align-items:center;gap:4px;transition:color var(--transition)}
    .text-link:hover{color:var(--accent-dark)}
    .text-link .arrow{transition:transform var(--transition)}
    .text-link:hover .arrow{transform:translateX(3px)}

    /* Badge & Tag */
    .badge-mini{display:inline-flex;align-items:center;gap:4px;font-size:12px;font-weight:600;padding:4px 12px;border-radius:20px;background:var(--success-bg);color:var(--success);border:1px solid rgba(46,125,90,.2)}
    .badge-version{display:inline-flex;align-items:center;gap:4px;font-size:12px;font-weight:600;padding:4px 12px;border-radius:20px;background:var(--bg);color:var(--text-light);border:1px solid var(--border)}
    .badge-official{display:inline-flex;align-items:center;gap:4px;font-size:12px;font-weight:600;padding:4px 12px;border-radius:20px;background:var(--danger-bg);color:var(--danger);border:1px solid rgba(155,74,47,.2)}

    /* Breadcrumb */
    .breadcrumb-bar{background:var(--white);border-bottom:1px solid var(--border-light);padding:14px 0}
    .breadcrumb{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-muted);margin:0;padding:0;list-style:none;flex-wrap:wrap}
    .breadcrumb li{display:flex;align-items:center;gap:8px}
    .breadcrumb li+li::before{content:"/";color:var(--border);font-size:13px}
    .breadcrumb a{color:var(--text-light);transition:color var(--transition)}
    .breadcrumb a:hover{color:var(--primary)}
    .breadcrumb li:last-child{color:var(--text);font-weight:500}

    /* Page Hero */
    .page-hero{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;padding:56px 0 48px;position:relative;overflow:hidden}
    .page-hero::after{content:"";position:absolute;top:-30%;right:-10%;width:400px;height:400px;background:radial-gradient(circle,rgba(197,154,91,.12) 0%,transparent 70%);pointer-events:none}
    .page-hero h1{font-size:32px;font-weight:700;line-height:1.3;margin-bottom:16px;color:#fff;position:relative;z-index:1}
    .page-hero p{font-size:15px;color:rgba(255,255,255,.8);max-width:720px;position:relative;z-index:1;margin-bottom:0}
    .page-hero .breadcrumb{margin-bottom:16px;position:relative;z-index:1}
    .page-hero .breadcrumb li+li::before{color:rgba(255,255,255,.3)}
    .page-hero .breadcrumb a{color:rgba(255,255,255,.7)}
    .page-hero .breadcrumb a:hover{color:#fff}
    .page-hero .breadcrumb li:last-child{color:#fff}

    /* Filter Bar */
    .filter-bar{background:var(--white);border:1px solid var(--border-light);border-radius:var(--radius-md);padding:16px 20px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:14px;box-shadow:var(--shadow-sm)}
    .filter-group{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
    .filter-label{font-size:13px;font-weight:600;color:var(--text-muted);white-space:nowrap}
    .filter-tag{font-size:13px;padding:6px 16px;border-radius:20px;background:var(--bg);color:var(--text-light);border:1px solid var(--border-light);transition:all var(--transition);white-space:nowrap}
    .filter-tag:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
    .filter-tag--active{background:var(--primary);color:#fff;border-color:var(--primary)}

    /* Download Cards */
    .download-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
    .download-card{background:var(--white);border:1px solid var(--border-light);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-md);transition:all var(--transition);display:flex;flex-direction:column}
    .download-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px)}
    .download-card__img{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--bg)}
    .download-card__img img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition)}
    .download-card:hover .download-card__img img{transform:scale(1.04)}
    .download-card__img .badge-version{position:absolute;top:12px;left:12px;background:rgba(255,255,255,.92);backdrop-filter:blur(4px)}
    .download-card__body{padding:20px;display:flex;flex-direction:column;flex:1}
    .download-card__title{font-size:17px;font-weight:700;color:var(--primary);margin-bottom:10px}
    .download-card__meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
    .download-card__info{font-size:13px;color:var(--text-light);margin-bottom:6px;display:flex;align-items:center;gap:8px}
    .download-card__info svg{width:16px;height:16px;color:var(--text-muted);flex-shrink:0}
    .download-card__actions{margin-top:auto;display:flex;gap:10px}
    .download-card__actions .btn{flex:1;padding:10px 16px;font-size:14px}

    /* Version Table */
    .table-responsive{overflow-x:auto;border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}
    .version-table{width:100%;border-collapse:collapse;background:var(--white);min-width:700px}
    .version-table th{background:var(--primary);color:#fff;font-size:13px;font-weight:600;padding:14px 16px;text-align:left;white-space:nowrap}
    .version-table td{font-size:13px;padding:14px 16px;border-bottom:1px solid var(--border-light);color:var(--text-light);vertical-align:middle}
    .version-table tr:last-child td{border-bottom:none}
    .version-table tr:hover td{background:var(--bg)}
    .version-table .td-highlight{font-weight:600;color:var(--primary)}
    .version-table .td-check{color:var(--success);font-weight:600}
    .version-table .td-muted{color:var(--text-muted)}

    /* Safety Bar */
    .safety-bar{background:var(--success-bg);border:1px solid rgba(46,125,90,.2);border-radius:var(--radius-md);padding:24px 28px;display:flex;align-items:flex-start;gap:20px;box-shadow:var(--shadow-sm)}
    .safety-bar__icon{width:44px;height:44px;border-radius:50%;background:var(--success);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0}
    .safety-bar__icon svg{width:22px;height:22px}
    .safety-bar__content h3{font-size:17px;font-weight:700;color:var(--success);margin-bottom:8px}
    .safety-bar__content p{font-size:14px;color:var(--text-light);margin-bottom:6px}

    /* Update Log */
    .update-log-list{display:flex;flex-direction:column;gap:0}
    .update-log-item{display:flex;align-items:flex-start;gap:16px;padding:18px 0;border-bottom:1px solid var(--border-light);transition:background var(--transition);border-radius:4px}
    .update-log-item:hover{background:var(--bg);padding-left:12px}
    .update-log-item:last-child{border-bottom:none}
    .update-date{font-size:12px;font-weight:600;color:var(--text-muted);background:var(--bg);padding:4px 12px;border-radius:20px;white-space:nowrap;flex-shrink:0}
    .update-log-item strong{display:block;font-size:15px;font-weight:600;color:var(--primary);margin-bottom:4px;line-height:1.5}
    .update-log-item .update-excerpt{font-size:13px;color:var(--text-light);line-height:1.7;margin-bottom:0}

    /* Tutorial Entry */
    .tutorial-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
    .tutorial-card{background:var(--white);border:1px solid var(--border-light);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-md);transition:all var(--transition);display:flex;flex-direction:column}
    .tutorial-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px)}
    .tutorial-card__img{aspect-ratio:4/3;overflow:hidden;background:var(--bg)}
    .tutorial-card__img img{width:100%;height:100%;object-fit:cover}
    .tutorial-card__body{padding:20px}
    .tutorial-card__title{font-size:15px;font-weight:700;color:var(--primary);margin-bottom:8px}
    .tutorial-card__desc{font-size:13px;color:var(--text-light);line-height:1.7;margin-bottom:14px}

    /* Bottom CTA */
    .bottom-cta{background:var(--primary);color:#fff;border-radius:var(--radius-lg);padding:48px 40px;text-align:center;position:relative;overflow:hidden}
    .bottom-cta::after{content:"";position:absolute;top:-50%;left:-20%;width:500px;height:500px;background:radial-gradient(circle,rgba(197,154,91,.15) 0%,transparent 70%);pointer-events:none}
    .bottom-cta h2{font-size:26px;font-weight:700;color:#fff;margin-bottom:12px;position:relative;z-index:1}
    .bottom-cta p{font-size:15px;color:rgba(255,255,255,.8);max-width:600px;margin:0 auto 24px;position:relative;z-index:1}
    .bottom-cta .btn{position:relative;z-index:1}

    /* Footer */
    .site-footer{background:var(--primary);color:rgba(255,255,255,.75);padding:48px 0 24px;margin-top:0}
    .footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:32px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.1)}
    .footer-logo{font-size:19px;font-weight:700;color:#fff;display:block;margin-bottom:12px}
    .footer-logo span{color:var(--accent)}
    .footer-desc{font-size:13px;line-height:1.7;color:rgba(255,255,255,.6);max-width:280px}
    .footer-col h3{font-size:14px;font-weight:600;color:#fff;margin-bottom:14px}
    .footer-col a{display:block;font-size:13px;color:rgba(255,255,255,.65);padding:6px 0;transition:color var(--transition)}
    .footer-col a:hover{color:var(--accent)}
    .footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;padding-top:20px;font-size:12px;color:rgba(255,255,255,.5)}
    .footer-bottom a{color:rgba(255,255,255,.6);transition:color var(--transition)}
    .footer-bottom a:hover{color:var(--accent)}

    /* Empty state */
    .empty-state{font-size:14px;color:var(--text-muted);text-align:center;padding:30px 20px;background:var(--bg);border-radius:var(--radius-sm)}

    /* Section separator variations */
    .section--bordered-bottom{border-bottom:1px solid var(--border-light)}

    /* Responsive */
    @media (max-width: 1200px) {
        .container{padding:0 16px}
    }
    @media (max-width: 1024px) {
        .download-grid{grid-template-columns:repeat(2,1fr)}
        .tutorial-grid{grid-template-columns:repeat(2,1fr)}
        .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
    }
    @media (max-width: 992px) {
        .section{padding:48px 0}
        .page-hero{padding:40px 0 36px}
        .page-hero h1{font-size:28px}
        .main-nav{display:none}
        .hamburger{display:flex}
        .header-cta--desktop{display:none}
    }
    @media (max-width: 768px) {
        .download-grid{grid-template-columns:1fr}
        .tutorial-grid{grid-template-columns:1fr}
        .filter-bar{flex-direction:column;align-items:flex-start}
        .filter-group{width:100%;justify-content:flex-start}
        .bottom-cta{padding:36px 24px}
        .bottom-cta h2{font-size:22px}
        .footer-grid{grid-template-columns:1fr;gap:20px}
        .footer-bottom{flex-direction:column;text-align:center;gap:6px}
        .section-head h2{font-size:22px}
        .page-hero h1{font-size:24px}
    }
    @media (max-width: 520px) {
        :root{--header-height:56px}
        .container{padding:0 12px}
        .section{padding:36px 0}
        .page-hero{padding:32px 0 28px}
        .page-hero h1{font-size:20px}
        .btn{padding:12px 20px;font-size:14px}
        .btn-lg{padding:14px 28px;font-size:15px}
        .download-card__actions{flex-direction:column}
        .download-card__actions .btn{width:100%}
        .safety-bar{flex-direction:column;align-items:center;text-align:center;padding:20px}
        .update-log-item{flex-direction:column;gap:8px}
        .update-date{align-self:flex-start}
    }

/* roulang page: category2 */
:root {
        --primary: #163B45;
        --primary-dark: #0E2C33;
        --primary-light: #235A66;
        --accent: #C59A5B;
        --accent-dark: #A87F42;
        --bg: #F4F3EF;
        --white: #FFFFFF;
        --text: #172A2D;
        --text-light: #4A5F63;
        --text-muted: #7C8F92;
        --border: #E1DDD4;
        --border-light: #EDEAE2;
        --success: #2E7D5A;
        --success-bg: #EAF4EE;
        --danger: #9B4A2F;
        --danger-bg: #F9EEE8;
        --shadow-sm: 0 2px 8px rgba(18,54,60,.05);
        --shadow-md: 0 6px 20px rgba(18,54,60,.06);
        --shadow-lg: 0 12px 28px rgba(18,54,60,.12);
        --radius-sm: 6px;
        --radius-md: 12px;
        --radius-lg: 16px;
        --radius-xl: 24px;
        --transition: .2s ease;
        --font-sans: "PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
        --font-num: "Inter","SF Pro Display",system-ui,sans-serif;
        --container: 1180px;
        --header-height: 64px;
    }
    html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
    body{font-family:var(--font-sans);font-size:15px;line-height:1.8;color:var(--text);background:var(--bg);min-height:100vh}
    img{max-width:100%;height:auto;display:block}
    a{text-decoration:none;color:inherit;transition:color var(--transition)}
    button,input,select,textarea{font-family:inherit;font-size:inherit;line-height:inherit}
    button{cursor:pointer;border:none;background:none}
    .container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}
    .section{padding:64px 0}
    .section--alt{background:var(--white)}
    .section--bg{background:var(--bg)}
    .section--dark{background:var(--primary);color:#E8EDED}
    .section--dark h2,.section--dark h3{color:#FFFFFF}
    .section-head{margin-bottom:40px}
    .section-head h2{font-size:26px;font-weight:700;line-height:1.35;color:var(--primary);margin-bottom:12px}
    .section-head p{font-size:15px;color:var(--text-light);max-width:720px}
    .section-head.center{text-align:center}
    .section-head.center p{margin-left:auto;margin-right:auto}

    /* Header */
    .site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light);transition:box-shadow var(--transition)}
    .site-header.scrolled{box-shadow:0 4px 16px rgba(18,54,60,.08)}
    .site-header .container{display:flex;align-items:center;justify-content:space-between;height:var(--header-height)}
    .logo{font-size:19px;font-weight:700;color:var(--primary);letter-spacing:.01em;white-space:nowrap}
    .logo span{color:var(--accent)}
    .main-nav{display:flex;align-items:center;gap:28px}
    .main-nav a{font-size:14px;font-weight:500;color:var(--text);position:relative;padding:4px 0;white-space:nowrap}
    .main-nav a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--primary);transition:width var(--transition)}
    .main-nav a:hover::after,.main-nav a.active::after{width:100%}
    .main-nav a.active{color:var(--primary);font-weight:600}
    .header-cta{display:inline-flex;align-items:center;gap:6px;background:var(--accent);color:#fff;font-weight:600;font-size:14px;padding:9px 20px;border-radius:8px;transition:background var(--transition),box-shadow var(--transition);white-space:nowrap}
    .header-cta:hover{background:var(--accent-dark);box-shadow:0 4px 12px rgba(197,154,91,.3)}
    .header-cta:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
    .hamburger{display:none;flex-direction:column;gap:5px;padding:8px;border-radius:6px;transition:background var(--transition)}
    .hamburger:hover{background:var(--bg)}
    .hamburger span{display:block;width:24px;height:2px;background:var(--primary);border-radius:2px;transition:transform var(--transition),opacity var(--transition)}
    .hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .hamburger.open span:nth-child(2){opacity:0}
    .hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

    /* Mobile drawer */
    .drawer-overlay{position:fixed;inset:0;background:rgba(18,54,60,.5);z-index:98;opacity:0;pointer-events:none;transition:opacity var(--transition)}
    .drawer-overlay.active{opacity:1;pointer-events:auto}
    .drawer{position:fixed;top:0;right:-300px;width:280px;height:100vh;background:var(--white);z-index:99;padding:24px;display:flex;flex-direction:column;gap:20px;transition:right .3s ease;box-shadow:-8px 0 30px rgba(18,54,60,.12);overflow-y:auto}
    .drawer.active{right:0}
    .drawer-close{align-self:flex-end;font-size:28px;color:var(--text);padding:4px 8px;border-radius:6px;transition:background var(--transition)}
    .drawer-close:hover{background:var(--bg)}
    .drawer a{font-size:16px;font-weight:500;color:var(--text);padding:10px 0;border-bottom:1px solid var(--border-light)}
    .drawer a.active{color:var(--primary);font-weight:600}
    .drawer .header-cta{margin-top:8px;justify-content:center}

    /* Buttons */
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:15px;padding:13px 28px;border-radius:8px;transition:all var(--transition);text-align:center;cursor:pointer;border:2px solid transparent}
    .btn-primary{background:var(--primary);color:#fff}
    .btn-primary:hover{background:var(--primary-dark);box-shadow:0 6px 18px rgba(18,54,60,.25);transform:translateY(-1px)}
    .btn-accent{background:var(--accent);color:#fff}
    .btn-accent:hover{background:var(--accent-dark);box-shadow:0 6px 18px rgba(197,154,91,.3);transform:translateY(-1px)}
    .btn-outline{border-color:var(--primary);color:var(--primary);background:transparent}
    .btn-outline:hover{background:var(--primary);color:#fff}
    .btn-outline-light{border-color:rgba(255,255,255,.5);color:#fff;background:transparent}
    .btn-outline-light:hover{background:rgba(255,255,255,.1);border-color:#fff}
    .btn-lg{padding:16px 36px;font-size:16px}
    .btn-sm{padding:10px 18px;font-size:13px;border-radius:6px}
    .btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
    .text-link{font-size:14px;font-weight:500;color:var(--primary);display:inline-flex;align-items:center;gap:4px;transition:color var(--transition)}
    .text-link:hover{color:var(--accent-dark)}

    /* Breadcrumb */
    .breadcrumb-nav{font-size:13px;color:var(--text-muted);margin-bottom:16px;display:flex;align-items:center;flex-wrap:wrap;gap:4px}
    .breadcrumb-nav a{color:var(--text-muted);transition:color var(--transition)}
    .breadcrumb-nav a:hover{color:var(--primary)}
    .breadcrumb-nav .sep{margin:0 6px;color:var(--border)}
    .breadcrumb-nav .current{color:var(--text);font-weight:500}

    /* Category H1 zone */
    .cat-hero{background:var(--white);border-bottom:1px solid var(--border-light);padding:48px 0 40px}
    .cat-hero h1{font-size:32px;font-weight:700;color:var(--primary);margin-bottom:14px;line-height:1.3}
    .cat-hero p{font-size:16px;color:var(--text-light);max-width:720px;margin-bottom:0}

    /* Install steps */
    .steps-wrapper{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
    .steps-timeline{position:relative;padding-left:36px}
    .steps-timeline::before{content:"";position:absolute;left:10px;top:6px;bottom:6px;width:2px;background:var(--border)}
    .step-item{position:relative;padding-bottom:32px}
    .step-item:last-child{padding-bottom:0}
    .step-item::before{content:attr(data-step);position:absolute;left:-36px;top:0;width:22px;height:22px;background:var(--primary);color:#fff;font-size:12px;font-weight:600;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--font-num)}
    .step-item h3{font-size:18px;font-weight:700;color:var(--primary);margin-bottom:8px}
    .step-item p{font-size:15px;color:var(--text-light);margin-bottom:0;line-height:1.7}
    .step-image-placeholder{border-radius:var(--radius-md);overflow:hidden;background:var(--bg);border:1px solid var(--border-light);aspect-ratio:4/3;display:flex;align-items:center;justify-content:center}
    .step-image-placeholder img{width:100%;height:100%;object-fit:cover}

    /* Device cards */
    .device-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
    .device-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:28px;box-shadow:var(--shadow-sm);transition:transform var(--transition),box-shadow var(--transition)}
    .device-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}
    .device-icon{width:48px;height:48px;border-radius:10px;background:var(--bg);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px;color:var(--primary)}
    .device-card h3{font-size:18px;font-weight:700;color:var(--primary);margin-bottom:12px}
    .device-card ul{list-style:none;padding:0;margin:0}
    .device-card ul li{font-size:14px;color:var(--text-light);padding:6px 0;border-bottom:1px dashed var(--border-light);display:flex;justify-content:space-between;gap:12px}
    .device-card ul li:last-child{border-bottom:none}
    .device-card ul li .label{color:var(--text-muted);flex-shrink:0}
    .device-card ul li .value{font-weight:500;color:var(--text);text-align:right}

    /* Verify block */
    .verify-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
    .verify-item{display:flex;gap:16px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:24px;transition:box-shadow var(--transition),transform var(--transition)}
    .verify-item:hover{box-shadow:var(--shadow-sm);transform:translateY(-2px)}
    .verify-num{flex-shrink:0;width:36px;height:36px;border-radius:50%;background:var(--success-bg);color:var(--success);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;font-family:var(--font-num)}
    .verify-item h3{font-size:16px;font-weight:700;color:var(--primary);margin-bottom:6px}
    .verify-item p{font-size:14px;color:var(--text-light);margin-bottom:0;line-height:1.7}

    /* FAQ */
    .faq-list{max-width:820px;margin:0 auto}
    .faq-item{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);margin-bottom:12px;overflow:hidden;transition:border-color var(--transition),box-shadow var(--transition)}
    .faq-item:hover{border-color:var(--primary-light)}
    .faq-item.open{border-color:var(--primary);box-shadow:var(--shadow-sm)}
    .faq-question{display:flex;align-items:center;justify-content:space-between;width:100%;padding:18px 22px;font-size:15px;font-weight:600;color:var(--text);text-align:left;gap:16px;transition:background var(--transition)}
    .faq-question:hover{background:var(--bg)}
    .faq-question .faq-icon{flex-shrink:0;width:28px;height:28px;border-radius:50%;background:var(--bg);display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--primary);transition:transform var(--transition),background var(--transition)}
    .faq-item.open .faq-question .faq-icon{transform:rotate(45deg);background:var(--primary);color:#fff}
    .faq-answer{max-height:0;overflow:hidden;transition:max-height .3s ease}
    .faq-item.open .faq-answer{max-height:300px}
    .faq-answer-inner{padding:0 22px 20px;font-size:14px;color:var(--text-light);line-height:1.8}

    /* Permission table */
    .permission-table-wrap{overflow-x:auto;border-radius:var(--radius-md);border:1px solid var(--border);background:var(--white)}
    .permission-table{width:100%;border-collapse:collapse;min-width:640px}
    .permission-table th{background:var(--primary);color:#fff;font-size:13px;font-weight:600;padding:14px 20px;text-align:left;white-space:nowrap}
    .permission-table td{font-size:14px;color:var(--text-light);padding:14px 20px;border-bottom:1px solid var(--border-light);vertical-align:top}
    .permission-table tr:last-child td{border-bottom:none}
    .permission-table tr:hover td{background:var(--bg)}
    .permission-name{font-weight:600;color:var(--primary);white-space:nowrap}
    .permission-tag{display:inline-block;font-size:12px;font-weight:500;padding:2px 10px;border-radius:999px;background:var(--success-bg);color:var(--success);white-space:nowrap}
    .permission-tag.optional{background:var(--bg);color:var(--text-muted)}
    .permission-tag.required{background:var(--danger-bg);color:var(--danger)}

    /* Bottom CTA */
    .cta-block{background:var(--primary);color:#E8EDED;border-radius:var(--radius-lg);padding:48px 40px;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
    .cta-block h2{font-size:24px;font-weight:700;color:#fff;margin-bottom:8px}
    .cta-block p{font-size:15px;color:rgba(255,255,255,.8);margin-bottom:0;max-width:560px}
    .cta-block .btn{flex-shrink:0}

    /* Footer */
    .site-footer{background:var(--primary);color:#C8D4D6;padding:56px 0 0}
    .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.12)}
    .footer-logo{font-size:19px;font-weight:700;color:#fff;display:inline-block;margin-bottom:12px}
    .footer-logo span{color:var(--accent)}
    .footer-desc{font-size:13px;line-height:1.7;color:#A5B6B9;max-width:300px;margin-bottom:0}
    .footer-col h3{font-size:14px;font-weight:600;color:#fff;margin-bottom:16px}
    .footer-col a{display:block;font-size:13px;color:#A5B6B9;padding:5px 0;transition:color var(--transition)}
    .footer-col a:hover{color:var(--accent)}
    .footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;padding:20px 0;font-size:12px;color:#7E9498}
    .footer-bottom a{color:#A5B6B9;transition:color var(--transition)}
    .footer-bottom a:hover{color:var(--accent)}

    /* Responsive */
    @media (max-width:1024px){
        .container{padding:0 16px}
        .steps-wrapper{grid-template-columns:1fr;gap:24px}
        .device-grid{grid-template-columns:repeat(2,1fr)}
        .verify-grid{grid-template-columns:1fr 1fr}
        .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
    }
    @media (max-width:768px){
        .section{padding:40px 0}
        .cat-hero{padding:32px 0 28px}
        .cat-hero h1{font-size:24px}
        .main-nav{display:none}
        .hamburger{display:flex}
        .section-head h2{font-size:22px}
        .device-grid{grid-template-columns:1fr}
        .verify-grid{grid-template-columns:1fr}
        .cta-block{padding:32px 24px;flex-direction:column;align-items:flex-start}
        .footer-grid{grid-template-columns:1fr;gap:28px}
        .footer-bottom{flex-direction:column;align-items:flex-start}
        .steps-timeline{padding-left:28px}
        .steps-timeline::before{left:6px}
        .step-item::before{left:-28px;width:18px;height:18px;font-size:10px}
    }
    @media (max-width:520px){
        .container{padding:0 12px}
        .cat-hero h1{font-size:21px}
        .section-head h2{font-size:20px}
        .btn-lg{padding:14px 24px;font-size:15px}
        .header-cta{padding:8px 16px;font-size:13px}
        .permission-table th,.permission-table td{padding:10px 14px;font-size:12px}
        .cta-block h2{font-size:20px}
        .step-image-placeholder{aspect-ratio:16/10}
    }

/* roulang page: category3 */
:root{
            --primary:#163B45;
            --primary-dark:#0E2C33;
            --primary-light:#235A66;
            --accent:#C59A5B;
            --accent-dark:#A87F42;
            --bg:#F4F3EF;
            --white:#FFFFFF;
            --text:#172A2D;
            --text-light:#4A5F63;
            --text-muted:#7C8F92;
            --border:#E1DDD4;
            --border-light:#EDEAE2;
            --success:#2E7D5A;
            --success-bg:#EAF4EE;
            --danger:#9B4A2F;
            --danger-bg:#F9EEE8;
            --shadow-sm:0 2px 8px rgba(18,54,60,.05);
            --shadow-md:0 6px 20px rgba(18,54,60,.06);
            --shadow-lg:0 12px 28px rgba(18,54,60,.12);
            --radius-sm:6px;
            --radius-md:12px;
            --radius-lg:16px;
            --radius-xl:24px;
            --transition:.2s ease;
            --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
            --font-num:"Inter","SF Pro Display",system-ui,sans-serif;
            --container:1180px;
            --header-height:64px;
        }
        html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
        body{font-family:var(--font-sans);font-size:15px;line-height:1.8;color:var(--text);background:var(--bg);min-height:100vh}
        img{max-width:100%;height:auto;display:block}
        a{text-decoration:none;color:inherit;transition:color var(--transition)}
        button,input,select,textarea{font-family:inherit;font-size:inherit;line-height:inherit}
        button{cursor:pointer;border:none;background:none}
        .container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}
        .section{padding:64px 0}
        .section--alt{background:var(--white)}
        .section--bg{background:var(--bg)}
        .section--dark{background:var(--primary);color:#E8EDED}
        .section--dark h2,.section--dark h3{color:#FFFFFF}
        .section-head{margin-bottom:40px}
        .section-head h2{font-size:26px;font-weight:700;line-height:1.35;color:var(--primary);margin-bottom:12px}
        .section-head p{font-size:15px;color:var(--text-light);max-width:720px}
        .section--dark .section-head h2{color:#fff}
        .section--dark .section-head p{color:rgba(232,237,237,.8)}
        .site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light);transition:box-shadow var(--transition)}
        .site-header.scrolled{box-shadow:0 4px 16px rgba(18,54,60,.08)}
        .site-header .container{display:flex;align-items:center;justify-content:space-between;height:var(--header-height)}
        .logo{font-size:19px;font-weight:700;color:var(--primary);letter-spacing:.01em;white-space:nowrap}
        .logo span{color:var(--accent)}
        .main-nav{display:flex;align-items:center;gap:28px}
        .main-nav a{font-size:14px;font-weight:500;color:var(--text);position:relative;padding:4px 0;white-space:nowrap}
        .main-nav a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--primary);transition:width var(--transition)}
        .main-nav a:hover::after,.main-nav a.active::after{width:100%}
        .main-nav a.active{color:var(--primary);font-weight:600}
        .header-cta{display:inline-flex;align-items:center;gap:6px;background:var(--accent);color:#fff;font-weight:600;font-size:14px;padding:9px 20px;border-radius:8px;transition:background var(--transition), box-shadow var(--transition);white-space:nowrap}
        .header-cta:hover{background:var(--accent-dark);box-shadow:0 4px 12px rgba(197,154,91,.3)}
        .header-cta:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
        .hamburger{display:none;flex-direction:column;gap:5px;padding:8px;border-radius:6px;transition:background var(--transition)}
        .hamburger:hover{background:var(--bg)}
        .hamburger span{display:block;width:24px;height:2px;background:var(--primary);border-radius:2px;transition:transform var(--transition),opacity var(--transition)}
        .hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
        .hamburger.open span:nth-child(2){opacity:0}
        .hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
        .drawer-overlay{position:fixed;inset:0;background:rgba(18,54,60,.5);z-index:98;opacity:0;pointer-events:none;transition:opacity var(--transition)}
        .drawer-overlay.active{opacity:1;pointer-events:auto}
        .drawer{position:fixed;top:0;right:-300px;width:280px;height:100vh;background:var(--white);z-index:99;padding:24px;display:flex;flex-direction:column;gap:20px;transition:right .3s ease;box-shadow:-8px 0 30px rgba(18,54,60,.12)}
        .drawer.active{right:0}
        .drawer-close{align-self:flex-end;font-size:28px;color:var(--text);padding:4px 8px;border-radius:6px;transition:background var(--transition)}
        .drawer-close:hover{background:var(--bg)}
        .drawer a{font-size:16px;font-weight:500;color:var(--text);padding:10px 0;border-bottom:1px solid var(--border-light)}
        .drawer a.active{color:var(--primary);font-weight:600}
        .drawer .header-cta{margin-top:8px;justify-content:center}
        .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:15px;padding:13px 28px;border-radius:8px;transition:all var(--transition);text-align:center;cursor:pointer;border:2px solid transparent}
        .btn-primary{background:var(--primary);color:#fff}
        .btn-primary:hover{background:var(--primary-dark);box-shadow:0 6px 18px rgba(18,54,60,.25);transform:translateY(-1px)}
        .btn-accent{background:var(--accent);color:#fff}
        .btn-accent:hover{background:var(--accent-dark);box-shadow:0 6px 18px rgba(197,154,91,.3);transform:translateY(-1px)}
        .btn-outline{border-color:var(--primary);color:var(--primary);background:transparent}
        .btn-outline:hover{background:var(--primary);color:#fff}
        .btn-outline-light{border-color:rgba(255,255,255,.5);color:#fff;background:transparent}
        .btn-outline-light:hover{background:rgba(255,255,255,.1);border-color:#fff}
        .btn-lg{padding:16px 36px;font-size:16px}
        .btn-sm{padding:10px 18px;font-size:13px;border-radius:6px}
        .btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
        .text-link{font-size:14px;font-weight:500;color:var(--primary);display:inline-flex;align-items:center;gap:4px;transition:color var(--transition)}
        .text-link:hover{color:var(--accent)}
        .breadcrumb{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-muted);padding:16px 0;border-bottom:1px solid var(--border-light);margin-bottom:24px}
        .breadcrumb a{color:var(--text-muted);transition:color var(--transition)}
        .breadcrumb a:hover{color:var(--primary)}
        .breadcrumb span.sep{color:var(--border)}
        .eyebrow{display:inline-block;font-size:13px;font-weight:600;color:var(--accent-dark);background:var(--white);border:1px solid var(--border);padding:6px 12px;border-radius:30px;margin-bottom:16px}
        .category-hero h1{font-size:36px;font-weight:700;line-height:1.25;color:var(--primary);margin-bottom:16px}
        .category-hero .lead{font-size:17px;color:var(--text-light);max-width:760px;margin-bottom:0}
        .card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:28px;box-shadow:var(--shadow-sm);transition:transform var(--transition),box-shadow var(--transition),border-color var(--transition)}
        .card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:var(--border)}
        .account-cards-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
        .service-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:24px;box-shadow:var(--shadow-sm);transition:transform var(--transition),box-shadow var(--transition)}
        .service-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
        .service-card .service-icon{width:48px;height:48px;border-radius:12px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:18px;font-weight:700}
        .service-card h3{font-size:18px;font-weight:600;color:var(--primary);margin-bottom:10px}
        .service-card p{font-size:14px;color:var(--text-light);margin-bottom:18px}
        .service-card .text-link{font-size:14px}
        .steps-horizontal{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
        .step-item{position:relative;background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:28px 24px;box-shadow:var(--shadow-sm);counter-increment:step}
        .step-item::before{content:counter(step);display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;background:var(--accent);color:#fff;font-weight:700;font-size:16px;margin-bottom:16px}
        .step-item h3{font-size:18px;font-weight:600;color:var(--primary);margin-bottom:10px}
        .step-item p{font-size:14px;color:var(--text-light);margin-bottom:0}
        .security-feature-split{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
        .security-feature-text h2{font-size:26px;font-weight:700;color:var(--primary);margin-bottom:20px}
        .security-points{list-style:none;padding:0;margin:0}
        .security-points li{position:relative;padding-left:28px;margin-bottom:16px;font-size:15px;color:var(--text-light)}
        .security-points li::before{content:"✓";position:absolute;left:0;top:0;color:var(--success);font-weight:700}
        .security-feature-image img{border-radius:var(--radius-lg);box-shadow:var(--shadow-md)}
        .faq-list{border-top:1px solid var(--border)}
        .faq-item{border-bottom:1px solid var(--border)}
        .faq-question{display:flex;align-items:center;justify-content:space-between;width:100%;padding:18px 0;background:none;border:none;font-size:16px;font-weight:600;color:var(--primary);text-align:left;gap:16px;transition:color var(--transition)}
        .faq-question:hover{color:var(--accent-dark)}
        .faq-question .faq-icon{flex-shrink:0;width:28px;height:28px;border-radius:50%;background:var(--bg);display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--primary);transition:transform var(--transition)}
        .faq-question.open .faq-icon{transform:rotate(45deg);background:var(--primary);color:#fff}
        .faq-answer{max-height:0;overflow:hidden;transition:max-height .3s ease}
        .faq-answer-inner{padding:0 0 20px 0;color:var(--text-light);font-size:15px}
        .faq-question.open + .faq-answer{max-height:300px}
        .help-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-lg);padding:40px;text-align:center;box-shadow:var(--shadow-md)}
        .help-card h2{font-size:24px;font-weight:700;color:var(--primary);margin-bottom:12px}
        .help-card p{color:var(--text-light);margin-bottom:24px}
        .help-links{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
        .risk-cta{display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:24px}
        .risk-cta h2{font-size:24px;font-weight:700;color:#fff;margin-bottom:8px}
        .risk-cta p{color:rgba(232,237,237,.8);margin-bottom:0;max-width:600px}
        .risk-note{font-size:13px;color:rgba(232,237,237,.6);border-top:1px solid rgba(255,255,255,.12);padding-top:16px}
        .news-list{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
        .news-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:24px;box-shadow:var(--shadow-sm);transition:transform var(--transition),box-shadow var(--transition)}
        .news-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
        .news-card .news-meta{display:flex;gap:12px;align-items:center;font-size:13px;color:var(--text-muted);margin-bottom:10px}
        .news-card .news-cat{background:var(--success-bg);color:var(--success);padding:2px 10px;border-radius:20px;font-weight:600}
        .news-card h3{font-size:17px;font-weight:600;color:var(--primary);line-height:1.45;margin-bottom:10px}
        .news-card p{font-size:14px;color:var(--text-light);margin-bottom:16px}
        .news-card .text-link{font-size:14px}
        .site-footer{background:var(--primary-dark);color:#E8EDED;padding:56px 0 0;margin-top:0}
        .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1)}
        .footer-logo{font-size:20px;font-weight:700;color:#fff;display:inline-block;margin-bottom:16px}
        .footer-logo span{color:var(--accent)}
        .footer-desc{font-size:14px;color:rgba(232,237,237,.7);max-width:360px;line-height:1.8}
        .footer-col h3{font-size:16px;font-weight:600;color:#fff;margin-bottom:16px}
        .footer-col a{display:block;font-size:14px;color:rgba(232,237,237,.7);margin-bottom:12px;transition:color var(--transition)}
        .footer-col a:hover{color:var(--accent)}
        .footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;padding:24px 0;font-size:13px;color:rgba(232,237,237,.6)}
        .footer-bottom a{color:rgba(232,237,237,.6);transition:color var(--transition)}
        .footer-bottom a:hover{color:var(--accent)}
        .empty-state{background:var(--white);border:1px dashed var(--border);border-radius:var(--radius-md);padding:40px;text-align:center;color:var(--text-muted)}
        @media (max-width:1024px){
            .account-cards-grid{grid-template-columns:repeat(2,1fr)}
            .steps-horizontal{grid-template-columns:repeat(2,1fr)}
            .news-list{grid-template-columns:repeat(2,1fr)}
            .security-feature-split{grid-template-columns:1fr;gap:24px}
            .footer-grid{grid-template-columns:1fr 1fr}
        }
        @media (max-width:768px){
            .main-nav{display:none}
            .hamburger{display:flex}
            .header-cta.desktop{display:none}
            .header-cta.mobile{display:inline-flex;width:100%;justify-content:center}
            .section{padding:48px 0}
            .category-hero h1{font-size:28px}
            .account-cards-grid{grid-template-columns:1fr}
            .steps-horizontal{grid-template-columns:1fr}
            .news-list{grid-template-columns:1fr}
            .risk-cta{flex-direction:column;align-items:flex-start}
            .footer-grid{grid-template-columns:1fr;gap:24px}
            .footer-bottom{flex-direction:column;text-align:center}
        }
        @media (max-width:520px){
            .container{padding:0 16px}
            .section{padding:40px 0}
            .btn-lg{padding:14px 28px;font-size:15px}
            .category-hero h1{font-size:24px}
            .section-head h2{font-size:22px}
        }