/* roulang page: index */
:root{
      --blue:#2563a8;
      --blue-deep:#174b83;
      --blue-soft:#eaf3fc;
      --cyan:#4e9eb5;
      --ink:#172b43;
      --muted:#64758b;
      --line:#dbe6f1;
      --paper:#ffffff;
      --mist:#f5f8fc;
      --warm:#f3eee7;
      --accent:#d77d52;
      --radius-lg:24px;
      --radius-md:16px;
      --radius-sm:10px;
      --shadow:0 16px 42px rgba(36,76,116,.10);
      --shadow-hover:0 22px 48px rgba(36,76,116,.17);
    }
    *,*::before,*::after{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--mist);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",Arial,sans-serif;font-size:16px;line-height:1.75}
    a{color:inherit;text-decoration:none;transition:color .2s ease,background .2s ease,border .2s ease,transform .2s ease}
    button,input,select{font:inherit}
    button{cursor:pointer}
    .container{width:min(1160px,calc(100% - 40px));margin:0 auto}
    .site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
    .nav-wrap{min-height:78px;display:flex;align-items:center;justify-content:space-between;gap:30px}
    .brand{display:flex;align-items:center;gap:12px;font-size:18px;font-weight:800;letter-spacing:-.02em;color:var(--blue-deep)}
    .brand-mark{width:38px;height:38px;border-radius:12px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:19px;box-shadow:0 7px 16px rgba(37,99,168,.22)}
    .brand em{font-style:normal;color:var(--accent)}
    .main-nav{display:flex;align-items:center;gap:7px}
    .main-nav a{padding:10px 15px;border-radius:9px;color:var(--muted);font-size:14px;font-weight:700}
    .main-nav a:hover,.main-nav a:focus{color:var(--blue);background:var(--blue-soft)}
    .main-nav a.active{color:var(--blue-deep);background:#e4effa}
    .menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:9px;padding:8px 12px;color:var(--blue-deep)}
    .hero{padding:74px 0 52px;background:linear-gradient(135deg,#edf6ff 0%,#f9fbfd 58%,#f4f0ea 100%);border-bottom:1px solid #e2ebf4}
    .hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:65px;align-items:center}
    .eyebrow,.section-kicker{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-size:12px;font-weight:800;letter-spacing:.12em}
    .eyebrow::before{content:"";width:22px;height:2px;background:var(--accent)}
    h1,h2,h3,p{margin-top:0}
    h1{font-size:clamp(34px,5vw,58px);line-height:1.16;letter-spacing:-.055em;margin:16px 0 20px;color:var(--ink)}
    .hero-copy{max-width:650px;color:#52677d;font-size:17px;line-height:1.9;margin-bottom:29px}
    .hero-actions{display:flex;align-items:center;gap:15px;flex-wrap:wrap}
    .btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 21px;border-radius:11px;border:1px solid transparent;font-size:14px;font-weight:800}
    .btn-primary{background:var(--blue);color:#fff;box-shadow:0 9px 18px rgba(37,99,168,.19)}
    .btn-primary:hover{background:var(--blue-deep);color:#fff;transform:translateY(-2px);box-shadow:0 13px 24px rgba(37,99,168,.25)}
    .btn-secondary{background:#fff;color:var(--blue-deep);border-color:#bfd3e7}
    .btn-secondary:hover{background:var(--blue-soft);border-color:var(--blue);color:var(--blue-deep)}
    .btn:focus,.main-nav a:focus,.menu-toggle:focus,input:focus,select:focus,summary:focus{outline:3px solid rgba(78,158,181,.30);outline-offset:3px}
    .hero-note{margin-top:18px;font-size:12px;color:#7a8796}
    .preview-panel{background:#fff;border:1px solid #d7e5f2;border-radius:var(--radius-lg);padding:25px;box-shadow:var(--shadow);position:relative}
    .preview-top{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:18px}
    .panel-title{font-weight:800;color:var(--blue-deep)}
    .live-label{font-size:12px;color:#55768d;background:#edf7f5;padding:5px 9px;border-radius:20px}
    .preview-feature{padding:18px;border-radius:15px;background:var(--blue-soft);margin-bottom:16px}
    .preview-feature strong{display:block;font-size:20px;line-height:1.35;margin:7px 0;color:var(--ink)}
    .tag{display:inline-block;border-radius:30px;padding:4px 9px;background:#fff;color:var(--blue);font-size:11px;font-weight:800}
    .preview-row{display:flex;align-items:center;justify-content:space-between;padding:13px 0;border-bottom:1px solid #edf1f5;font-size:13px}
    .preview-row:last-child{border-bottom:0}
    .preview-row span:last-child{color:var(--muted);font-size:12px}
    .section{padding:78px 0}
    .section-head{max-width:700px;margin-bottom:30px}
    .section-head h2{font-size:clamp(27px,3.4vw,39px);line-height:1.25;letter-spacing:-.04em;margin:10px 0 12px}
    .section-head p{color:var(--muted);margin-bottom:0}
    .metric-band{display:grid;grid-template-columns:1.2fr repeat(3,1fr);gap:14px}
    .metric{background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);padding:22px 24px;min-height:130px}
    .metric.primary{background:var(--blue);color:#fff;border-color:var(--blue)}
    .metric small{display:block;font-size:12px;font-weight:800;opacity:.72;margin-bottom:14px}
    .metric strong{display:block;font-size:31px;line-height:1.1;margin-bottom:8px}
    .metric p{font-size:12px;color:var(--muted);margin:0}
    .metric.primary p{color:#dcecff}
    .matrix{display:grid;grid-template-columns:1.45fr .85fr .85fr;grid-template-rows:1fr 1fr;gap:16px}
    .matrix-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);padding:25px;box-shadow:0 8px 25px rgba(38,82,120,.05);transition:transform .2s,box-shadow .2s,border .2s}
    .matrix-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#b8d2e9}
    .matrix-main{grid-row:span 2;background:#eaf4fd}
    .card-index{font-size:12px;color:var(--accent);font-weight:900;letter-spacing:.12em}
    .matrix-card h3{font-size:21px;margin:13px 0 8px;line-height:1.35}
    .matrix-card p{font-size:14px;color:var(--muted);margin-bottom:20px}
    .text-link{font-size:13px;font-weight:800;color:var(--blue)}
    .text-link:hover{color:var(--blue-deep);text-decoration:underline}
    .compare{display:grid;grid-template-columns:.9fr 1.1fr;gap:20px}
    .compare-callout{background:var(--blue);border-radius:var(--radius-lg);padding:32px;color:#fff}
    .compare-callout h3{font-size:25px;line-height:1.35;margin:14px 0}
    .compare-callout p{color:#d8eaff;font-size:14px}
    .compare-list{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:13px 25px}
    .compare-item{display:grid;grid-template-columns:100px 90px 1fr;gap:15px;align-items:center;padding:17px 0;border-bottom:1px solid #edf1f5;font-size:14px}
    .compare-item:last-child{border-bottom:0}
    .status{font-size:12px;color:#327b68;background:#edf8f4;border-radius:30px;padding:4px 8px;text-align:center}
    .faq-list{max-width:850px;border-top:1px solid var(--line)}
    details{border-bottom:1px solid var(--line);background:#fff}
    summary{list-style:none;cursor:pointer;padding:22px 48px 22px 3px;font-weight:800;position:relative}
    summary::-webkit-details-marker{display:none}
    summary::after{content:"+";position:absolute;right:8px;top:17px;font-size:25px;font-weight:300;color:var(--blue)}
    details[open] summary::after{content:"−"}
    details p{padding:0 48px 22px 3px;color:var(--muted);font-size:14px;margin:0}
    .feedback{background:#eaf4fd;border:1px solid #d2e4f4;border-radius:var(--radius-lg);padding:38px}
    .feedback-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:45px;align-items:start}
    .feedback h2{font-size:30px;line-height:1.3;margin:10px 0 12px}
    .feedback-copy{color:var(--muted);font-size:14px}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    label{display:block;font-size:13px;font-weight:800;color:var(--ink)}
    input,select{width:100%;height:46px;margin-top:7px;padding:0 13px;border:1px solid #c7d9e9;border-radius:9px;background:#fff;color:var(--ink)}
    .field-full{grid-column:1/-1}
    .form-tip{font-size:12px;color:#718296;margin:12px 0 0}
    .site-footer{background:#fff;border-top:1px solid var(--line);padding:45px 0 25px}
    .footer-grid{display:grid;grid-template-columns:1.4fr .8fr .8fr;gap:35px}
    .footer-brand{font-weight:800;color:var(--blue-deep);font-size:17px;margin-bottom:10px}
    .footer-copy{font-size:13px;color:var(--muted);max-width:340px}
    .footer-title{font-size:13px;font-weight:800;margin-bottom:11px}
    .footer-links a{display:block;color:var(--muted);font-size:13px;margin:6px 0}
    .footer-links a:hover{color:var(--blue)}
    .copyright{border-top:1px solid #edf1f5;margin-top:32px;padding-top:18px;color:#8492a1;font-size:12px;display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap}
    .form-status{display:none;margin-top:12px;color:#327b68;font-size:13px}
    @media(max-width:900px){
      .hero-grid,.feedback-grid{grid-template-columns:1fr;gap:34px}
      .metric-band{grid-template-columns:1fr 1fr}
      .metric.primary{grid-column:1/-1}
      .matrix{grid-template-columns:1fr 1fr;grid-template-rows:auto}
      .matrix-main{grid-row:auto;grid-column:1/-1}
    }
    @media(max-width:680px){
      .container{width:min(100% - 28px,1160px)}
      .nav-wrap{min-height:68px}
      .brand{font-size:15px;gap:8px}
      .brand-mark{width:33px;height:33px;border-radius:9px}
      .menu-toggle{display:block}
      .main-nav{display:none;position:absolute;left:14px;right:14px;top:67px;background:#fff;border:1px solid var(--line);border-radius:13px;padding:8px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}
      .main-nav.open{display:flex}
      .main-nav a{padding:12px 14px}
      .hero{padding:49px 0 38px}
      h1{font-size:37px}
      .hero-copy{font-size:15px}
      .hero-actions .btn{width:100%}
      .section{padding:54px 0}
      .metric-band,.matrix,.compare,.footer-grid{grid-template-columns:1fr}
      .matrix-main{grid-column:auto}
      .compare-item{grid-template-columns:78px 80px 1fr;gap:8px;font-size:13px}
      .feedback{padding:25px 18px}
      .form-grid{grid-template-columns:1fr}
      .field-full{grid-column:auto}
      .copyright{display:block}
      .copyright span{display:block;margin-top:5px}
    }

/* roulang page: category1 */
:root{
      --blue:#2563a8;
      --blue-deep:#174b83;
      --blue-soft:#eaf3fc;
      --cyan:#4e9eb5;
      --ink:#172b43;
      --muted:#64758b;
      --line:#dbe6f1;
      --paper:#fff;
      --mist:#f5f8fc;
      --warm:#f3eee7;
      --accent:#d77d52;
      --green:#327b68;
      --radius-lg:24px;
      --radius-md:16px;
      --radius-sm:10px;
      --shadow:0 16px 42px rgba(36,76,116,.10);
      --shadow-hover:0 22px 48px rgba(36,76,116,.17);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--mist);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",Arial,sans-serif;font-size:16px;line-height:1.75}
    a{color:inherit;text-decoration:none;transition:color .2s ease,background .2s ease,border .2s ease,transform .2s ease}
    button,input,select{font:inherit}
    button{cursor:pointer}
    h1,h2,h3,p{margin-top:0}
    h1{font-size:clamp(34px,5vw,58px);line-height:1.18;letter-spacing:-.055em;margin:16px 0 20px;color:var(--ink)}
    h2{font-size:clamp(27px,3.4vw,39px);line-height:1.25;letter-spacing:-.04em;margin:10px 0 12px}
    h3{line-height:1.35}
    .container{width:min(1160px,calc(100% - 40px));margin:0 auto}
    .site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
    .nav-wrap{min-height:78px;display:flex;align-items:center;justify-content:space-between;gap:30px}
    .brand{display:flex;align-items:center;gap:12px;font-size:18px;font-weight:800;letter-spacing:-.02em;color:var(--blue-deep)}
    .brand-mark{width:38px;height:38px;border-radius:12px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:19px;box-shadow:0 7px 16px rgba(37,99,168,.22)}
    .brand em{font-style:normal;color:var(--accent)}
    .main-nav{display:flex;align-items:center;gap:7px}
    .main-nav a{padding:10px 15px;border-radius:9px;color:var(--muted);font-size:14px;font-weight:700}
    .main-nav a:hover,.main-nav a:focus{color:var(--blue);background:var(--blue-soft)}
    .main-nav a.active{color:var(--blue-deep);background:#e4effa}
    .menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:9px;padding:8px 12px;color:var(--blue-deep)}
    .hero{padding:67px 0 53px;background:linear-gradient(135deg,#edf6ff 0%,#f9fbfd 61%,#f4f0ea 100%);border-bottom:1px solid #e2ebf4}
    .hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:65px;align-items:center}
    .eyebrow,.section-kicker{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-size:12px;font-weight:800;letter-spacing:.12em}
    .eyebrow::before{content:"";width:22px;height:2px;background:var(--accent)}
    .hero-copy{max-width:650px;color:#52677d;font-size:17px;line-height:1.9;margin-bottom:27px}
    .hero-actions{display:flex;align-items:center;gap:15px;flex-wrap:wrap}
    .btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 21px;border-radius:11px;border:1px solid transparent;font-size:14px;font-weight:800}
    .btn-primary{background:var(--blue);color:#fff;box-shadow:0 9px 18px rgba(37,99,168,.19)}
    .btn-primary:hover{background:var(--blue-deep);color:#fff;transform:translateY(-2px);box-shadow:0 13px 24px rgba(37,99,168,.25)}
    .btn-secondary{background:#fff;color:var(--blue-deep);border-color:#bfd3e7}
    .btn-secondary:hover{background:var(--blue-soft);border-color:var(--blue)}
    .btn:focus,.main-nav a:focus,.menu-toggle:focus,input:focus,select:focus,summary:focus{outline:3px solid rgba(78,158,181,.3);outline-offset:3px}
    .hero-note{margin-top:17px;font-size:12px;color:#718296}
    .hero-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:25px;box-shadow:var(--shadow);position:relative}
    .hero-panel:before{content:"";position:absolute;right:22px;top:22px;width:66px;height:66px;border:1px solid #c9e0f1;border-radius:50%}
    .panel-head{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #edf1f5;padding-bottom:16px;margin-bottom:12px}
    .panel-title{font-weight:800;color:var(--blue-deep)}
    .status{font-size:11px;color:var(--green);background:#eaf6f0;border-radius:20px;padding:4px 9px;font-weight:700}
    .index-row{display:grid;grid-template-columns:40px 1fr auto;gap:13px;align-items:center;padding:15px 0;border-bottom:1px solid #edf1f5}
    .index-row:last-child{border-bottom:0}
    .row-number{font-size:12px;color:var(--accent);font-weight:900}
    .index-row strong{font-size:14px;display:block}
    .index-row small{font-size:12px;color:var(--muted)}
    .row-arrow{color:var(--blue);font-size:19px}
    .section{padding:78px 0}
    .section-head{max-width:710px;margin-bottom:30px}
    .section-head p{color:var(--muted);margin-bottom:0}
    .filter-bar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin-bottom:27px;box-shadow:0 7px 22px rgba(38,82,120,.04)}
    .filter-label{font-size:13px;font-weight:800;color:var(--blue-deep);margin-right:5px}
    .filter-chip{border:1px solid #cbdceb;background:#fff;color:var(--muted);border-radius:22px;padding:7px 14px;font-size:12px}
    .filter-chip:hover,.filter-chip.selected{background:var(--blue-soft);border-color:#8eb7d8;color:var(--blue-deep)}
    .index-layout{display:grid;grid-template-columns:1.55fr .75fr;gap:28px;align-items:start}
    .index-list{display:grid;gap:16px}
    .index-card{display:grid;grid-template-columns:74px 1fr auto;gap:20px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);padding:22px;box-shadow:0 8px 25px rgba(38,82,120,.05);transition:transform .2s,box-shadow .2s,border .2s}
    .index-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#b8d2e9}
    .cover{height:72px;border-radius:12px;background:linear-gradient(145deg,#dceefa,#f3eee7);display:grid;place-items:center;color:var(--blue);font-size:24px;font-weight:900}
    .card-meta{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:7px}
    .tag{display:inline-block;border-radius:30px;padding:4px 9px;background:var(--blue-soft);color:var(--blue);font-size:11px;font-weight:800}
    .tag.warm{background:#f8eee8;color:#a75d3b}
    .index-card h3{font-size:19px;margin:0 0 5px}
    .index-card p{font-size:13px;color:var(--muted);margin:0}
    .card-side{text-align:right;white-space:nowrap}
    .card-side small{display:block;color:#8a98a7;font-size:11px;margin-bottom:9px}
    .text-link{font-size:13px;font-weight:800;color:var(--blue)}
    .text-link:hover{color:var(--blue-deep);text-decoration:underline}
    .side-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);padding:23px;box-shadow:0 8px 25px rgba(38,82,120,.05)}
    .side-panel h3{font-size:18px;margin:0 0 15px}
    .side-links{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px}
    .side-links a{font-size:12px;color:var(--muted);border:1px solid var(--line);border-radius:20px;padding:6px 10px}
    .side-links a:hover{border-color:var(--blue);color:var(--blue);background:var(--blue-soft)}
    .notice{border-left:3px solid var(--accent);padding-left:14px;color:var(--muted);font-size:13px}
    .notice strong{display:block;color:var(--ink);margin-bottom:5px}
    .collection{background:var(--blue-deep);color:#fff;border-radius:var(--radius-lg);padding:34px;box-shadow:var(--shadow)}
    .collection-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center}
    .collection h2{color:#fff;margin-top:9px}
    .collection p{color:#c8dced;max-width:650px}
    .collection .section-kicker{color:#a9d9e1}
    .collection .section-kicker:before{background:var(--accent)}
    .mini-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .mini-stat{border:1px solid rgba(255,255,255,.18);border-radius:14px;padding:17px;background:rgba(255,255,255,.07)}
    .mini-stat strong{display:block;font-size:27px;color:#fff}
    .mini-stat span{font-size:12px;color:#c8dced}
    .path-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-top:27px}
    .path-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);padding:20px}
    .path-card strong{display:block;color:var(--blue-deep);margin:8px 0 4px}
    .path-card p{font-size:13px;color:var(--muted);margin:0}
    .faq-list{max-width:850px;border-top:1px solid var(--line)}
    details{border-bottom:1px solid var(--line);background:#fff}
    summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;gap:20px;padding:20px 3px;font-weight:800;color:var(--ink)}
    summary::-webkit-details-marker{display:none}
    summary:after{content:"+";font-size:22px;color:var(--blue);font-weight:400;line-height:1}
    details[open] summary:after{content:"−"}
    details p{padding:0 38px 20px 3px;color:var(--muted);font-size:14px;margin:0}
    .feedback{background:#eef6fd;border-top:1px solid #dcecf8;border-bottom:1px solid #dcecf8}
    .feedback-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:55px;align-items:start}
    .feedback-intro p{color:var(--muted);font-size:15px}
    .form-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px;box-shadow:var(--shadow)}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    label{display:block;font-size:13px;font-weight:800;color:var(--blue-deep)}
    input,select{width:100%;height:46px;margin-top:7px;padding:0 13px;border:1px solid #c7d9e9;border-radius:9px;background:#fff;color:var(--ink)}
    input::placeholder{color:#a4b1bf}
    input:hover,select:hover{border-color:#9fc0da}
    .full{grid-column:1/-1}
    .form-tip{font-size:12px;color:#718296;margin:12px 0 0}
    .form-status{display:none;margin-top:12px;color:var(--green);font-size:13px}
    .site-footer{background:#fff;border-top:1px solid var(--line);padding:45px 0 25px}
    .footer-grid{display:grid;grid-template-columns:1.4fr .8fr .8fr;gap:35px}
    .footer-brand{font-weight:800;color:var(--blue-deep);font-size:17px;margin-bottom:10px}
    .footer-copy{font-size:13px;color:var(--muted);max-width:340px}
    .footer-title{font-size:13px;font-weight:800;margin-bottom:11px}
    .footer-links a{display:block;color:var(--muted);font-size:13px;margin:6px 0}
    .footer-links a:hover{color:var(--blue)}
    .copyright{border-top:1px solid #edf1f5;margin-top:32px;padding-top:18px;color:#8492a1;font-size:12px;display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap}
    @media(max-width:900px){
      .hero-grid,.feedback-grid,.index-layout{grid-template-columns:1fr;gap:34px}
      .collection-grid{grid-template-columns:1fr}
      .path-grid{grid-template-columns:1fr 1fr}
    }
    @media(max-width:700px){
      .container{width:min(100% - 28px,1160px)}
      .nav-wrap{min-height:68px}
      .brand{font-size:15px;gap:8px}
      .brand-mark{width:33px;height:33px;border-radius:9px}
      .menu-toggle{display:block}
      .main-nav{display:none;position:absolute;left:14px;right:14px;top:68px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px;box-shadow:var(--shadow)}
      .main-nav.open{display:flex;flex-direction:column;align-items:stretch}
      .main-nav a{padding:12px 14px}
      .hero{padding:49px 0 40px}
      .section{padding:57px 0}
      .index-card{grid-template-columns:58px 1fr;gap:14px;padding:17px}
      .cover{height:58px}
      .card-side{grid-column:2;text-align:left}
      .path-grid,.form-grid,.footer-grid{grid-template-columns:1fr}
      .full{grid-column:auto}
      .collection{padding:25px 20px}
      .compare-item{grid-template-columns:74px 72px 1fr;gap:9px;font-size:13px}
    }
    @media(max-width:430px){
      h1{font-size:35px}
      .hero-actions .btn{width:100%}
      .filter-bar{align-items:flex-start}
      .filter-chip{padding:6px 10px}
      .hero-panel{padding:19px}
    }

/* roulang page: category2 */
:root{
            --blue:#2563a8;
            --blue-deep:#174b83;
            --blue-soft:#eaf3fc;
            --cyan:#4e9eb5;
            --ink:#172b43;
            --muted:#64758b;
            --line:#dbe6f1;
            --paper:#ffffff;
            --mist:#f5f8fc;
            --warm:#f3eee7;
            --accent:#d77d52;
            --success:#327b68;
            --radius-lg:24px;
            --radius-md:16px;
            --radius-sm:10px;
            --shadow:0 16px 42px rgba(36,76,116,.10);
            --shadow-hover:0 22px 48px rgba(36,76,116,.17);
        }
        *{box-sizing:border-box}
        html{scroll-behavior:smooth}
        body{
            margin:0;
            background:var(--mist);
            color:var(--ink);
            font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",Arial,sans-serif;
            font-size:16px;
            line-height:1.75;
        }
        img{max-width:100%;display:block}
        a{color:inherit;text-decoration:none;transition:color .2s ease,background .2s ease,border .2s ease,transform .2s ease}
        button,input,select,textarea{font:inherit}
        button{cursor:pointer}
        .container{width:min(1160px,calc(100% - 40px));margin:0 auto}
        .site-header{
            position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);
            border-bottom:1px solid var(--line);backdrop-filter:blur(12px)
        }
        .nav-wrap{min-height:78px;display:flex;align-items:center;justify-content:space-between;gap:30px}
        .brand{display:flex;align-items:center;gap:12px;font-size:18px;font-weight:800;letter-spacing:-.02em;color:var(--blue-deep)}
        .brand-mark{
            width:38px;height:38px;border-radius:12px;background:var(--blue);color:#fff;
            display:grid;place-items:center;font-size:19px;box-shadow:0 7px 16px rgba(37,99,168,.22)
        }
        .brand em{font-style:normal;color:var(--accent)}
        .main-nav{display:flex;align-items:center;gap:7px}
        .main-nav a{padding:10px 15px;border-radius:9px;color:var(--muted);font-size:14px;font-weight:700}
        .main-nav a:hover,.main-nav a:focus{color:var(--blue);background:var(--blue-soft)}
        .main-nav a.active{color:var(--blue-deep);background:#e4effa}
        .menu-toggle{
            display:none;border:1px solid var(--line);background:#fff;border-radius:9px;
            padding:8px 12px;color:var(--blue-deep)
        }
        .hero{
            position:relative;overflow:hidden;padding:70px 0 62px;
            background:linear-gradient(135deg,#edf6ff 0%,#f9fbfd 58%,#f4f0ea 100%);
            border-bottom:1px solid #e2ebf4
        }
        .hero:after{
            content:"";position:absolute;width:280px;height:280px;border:1px solid rgba(37,99,168,.12);
            border-radius:50%;right:-90px;top:-110px
        }
        .hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:58px;align-items:center;position:relative;z-index:1}
        .eyebrow,.section-kicker{
            display:inline-flex;align-items:center;gap:8px;color:var(--blue);
            font-size:12px;font-weight:800;letter-spacing:.12em
        }
        .eyebrow:before{content:"";width:22px;height:2px;background:var(--accent)}
        h1,h2,h3,p{margin-top:0}
        h1{
            margin:15px 0 18px;font-size:clamp(35px,5vw,61px);line-height:1.16;
            letter-spacing:-.055em;color:var(--ink);max-width:670px
        }
        .hero-copy{max-width:620px;color:#52677d;font-size:17px;line-height:1.9;margin-bottom:27px}
        .hero-actions{display:flex;align-items:center;gap:15px;flex-wrap:wrap}
        .btn{
            display:inline-flex;align-items:center;justify-content:center;min-height:46px;
            padding:0 21px;border-radius:11px;border:1px solid transparent;font-size:14px;font-weight:800
        }
        .btn-primary{background:var(--blue);color:#fff;box-shadow:0 9px 18px rgba(37,99,168,.19)}
        .btn-primary:hover{background:var(--blue-deep);color:#fff;transform:translateY(-2px);box-shadow:0 13px 24px rgba(37,99,168,.25)}
        .btn-secondary{background:#fff;color:var(--blue-deep);border-color:#bfd3e7}
        .btn-secondary:hover{background:var(--blue-soft);border-color:var(--blue)}
        .btn:focus,.main-nav a:focus,.menu-toggle:focus,input:focus,select:focus,textarea:focus,summary:focus{
            outline:3px solid rgba(78,158,181,.30);outline-offset:3px
        }
        .hero-note{margin-top:17px;font-size:12px;color:#7a8796}
        .video-panel{
            min-height:360px;border-radius:var(--radius-lg);padding:19px;background:#dcecf9;
            box-shadow:var(--shadow);position:relative;display:flex;align-items:flex-end;overflow:hidden
        }
        .video-panel:before,.video-panel:after{
            content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.42)
        }
        .video-panel:before{width:260px;height:260px;right:-68px;top:-80px}
        .video-panel:after{width:130px;height:130px;left:-34px;bottom:45px;background:rgba(78,158,181,.16)}
        .video-screen{
            width:100%;min-height:320px;border-radius:17px;position:relative;overflow:hidden;
            background:linear-gradient(145deg,#1a4d7b,#4c91b2 54%,#e5c6b2)
        }
        .video-screen:before{
            content:"";position:absolute;inset:0;
            background:linear-gradient(125deg,rgba(12,39,69,.62),transparent 58%,rgba(255,255,255,.13))
        }
        .video-caption{position:absolute;left:25px;top:25px;color:#fff;z-index:1}
        .video-caption small{display:block;font-size:11px;letter-spacing:.12em;opacity:.78}
        .video-caption strong{display:block;margin-top:8px;font-size:25px;line-height:1.35}
        .play-button{
            position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:2;
            width:68px;height:68px;border-radius:50%;border:1px solid rgba(255,255,255,.7);
            background:rgba(255,255,255,.92);color:var(--blue);font-size:25px;padding-left:5px;
            box-shadow:0 12px 25px rgba(10,43,74,.2);transition:transform .2s,background .2s
        }
        .play-button:hover{transform:translate(-50%,-50%) scale(1.05);background:#fff}
        .screen-meta{
            position:absolute;left:20px;right:20px;bottom:18px;z-index:2;
            display:flex;justify-content:space-between;gap:12px;color:#fff;font-size:12px
        }
        .screen-meta span{padding:5px 9px;border-radius:20px;background:rgba(19,50,78,.52)}
        .section{padding:78px 0}
        .section-head{max-width:700px;margin-bottom:31px}
        .section-head h2{font-size:clamp(27px,3.4vw,39px);line-height:1.25;letter-spacing:-.04em;margin:10px 0 12px}
        .section-head p{color:var(--muted);margin-bottom:0}
        .filter-bar{
            background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);
            padding:14px 17px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;
            box-shadow:0 8px 24px rgba(38,82,120,.05);margin-bottom:26px
        }
        .filter-label{font-size:13px;color:var(--muted);font-weight:700;margin-right:4px}
        .filter-chip{
            border:1px solid #c8dbea;border-radius:30px;background:#fff;color:var(--muted);
            padding:7px 13px;font-size:12px;font-weight:700
        }
        .filter-chip:hover,.filter-chip.active{background:var(--blue-soft);border-color:#9dc3e2;color:var(--blue-deep)}
        .feature-layout{display:grid;grid-template-columns:1.3fr .7fr;gap:22px;align-items:stretch}
        .feature-card{
            position:relative;min-height:285px;padding:28px;border-radius:var(--radius-lg);
            background:linear-gradient(135deg,#215f99,#4e9eb5);color:#fff;overflow:hidden;
            box-shadow:var(--shadow)
        }
        .feature-card:after{
            content:"";position:absolute;width:230px;height:230px;border:1px solid rgba(255,255,255,.24);
            border-radius:50%;right:-65px;bottom:-95px
        }
        .feature-card .tag{background:rgba(255,255,255,.18);color:#fff}
        .feature-card h3{font-size:28px;line-height:1.35;max-width:520px;margin:20px 0 10px;position:relative;z-index:1}
        .feature-card p{max-width:510px;color:rgba(255,255,255,.82);font-size:14px;position:relative;z-index:1}
        .feature-card .text-link{color:#fff;position:relative;z-index:1}
        .side-note{
            background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);
            padding:25px;box-shadow:0 8px 25px rgba(38,82,120,.05)
        }
        .side-note h3{font-size:19px;line-height:1.4;margin:0 0 15px}
        .mini-list{list-style:none;padding:0;margin:0}
        .mini-list li{display:flex;justify-content:space-between;gap:12px;padding:13px 0;border-bottom:1px solid #edf1f5;font-size:13px}
        .mini-list li:last-child{border-bottom:0}
        .mini-list span:last-child{color:var(--muted);font-size:12px;white-space:nowrap}
        .collection-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
        .collection-card{
            background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);
            padding:23px;transition:transform .2s,box-shadow .2s,border .2s
        }
        .collection-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#b8d2e9}
        .collection-card:nth-child(2){background:#f0f7fd}
        .card-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
        .tag{display:inline-block;border-radius:30px;padding:4px 9px;background:#fff;color:var(--blue);font-size:11px;font-weight:800}
        .card-number{font-size:12px;color:var(--accent);font-weight:900;letter-spacing:.12em}
        .collection-card h3{font-size:21px;line-height:1.35;margin:15px 0 8px}
        .collection-card p{font-size:14px;color:var(--muted);margin-bottom:20px}
        .text-link{font-size:13px;font-weight:800;color:var(--blue)}
        .text-link:hover{color:var(--blue-deep);text-decoration:underline}
        .timeline{
            position:relative;max-width:880px;margin-top:8px;padding-left:25px;border-left:2px solid #c8dbea
        }
        .timeline-item{position:relative;padding:0 0 28px 25px}
        .timeline-item:last-child{padding-bottom:0}
        .timeline-item:before{
            content:"";position:absolute;left:-33px;top:7px;width:13px;height:13px;
            border:3px solid var(--blue);background:var(--mist);border-radius:50%
        }
        .timeline-date{font-size:12px;color:var(--accent);font-weight:800;letter-spacing:.06em}
        .timeline-item h3{font-size:20px;line-height:1.4;margin:7px 0 5px}
        .timeline-item p{font-size:14px;color:var(--muted);margin:0}
        .comparison-wrap{display:grid;grid-template-columns:.8fr 1.2fr;gap:22px;align-items:stretch}
        .comparison-intro{background:var(--blue-soft);border-radius:var(--radius-lg);padding:28px}
        .comparison-intro h3{font-size:25px;line-height:1.4;margin:12px 0}
        .comparison-intro p{color:var(--muted);font-size:14px}
        .compare-list{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:13px 25px}
        .compare-item{display:grid;grid-template-columns:110px 90px 1fr;gap:15px;align-items:center;padding:17px 0;border-bottom:1px solid #edf1f5;font-size:14px}
        .compare-item:last-child{border-bottom:0}
        .status{font-size:12px;font-weight:800;color:var(--success)}
        .status:before{content:"✓";display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;background:#e4f3ed;margin-right:6px}
        .faq-list{max-width:880px;border-top:1px solid var(--line)}
        details{border-bottom:1px solid var(--line);background:#fff}
        summary{list-style:none;cursor:pointer;padding:19px 20px;font-weight:800;display:flex;justify-content:space-between;gap:20px}
        summary::-webkit-details-marker{display:none}
        summary:after{content:"+";font-size:23px;font-weight:400;color:var(--blue)}
        details[open] summary:after{content:"−"}
        .faq-answer{padding:0 55px 19px 20px;color:var(--muted);font-size:14px}
        .cta{
            background:linear-gradient(135deg,#eaf4fd,#f4f0ea);border:1px solid var(--line);
            border-radius:var(--radius-lg);padding:38px 42px
        }
        .cta-grid{display:flex;align-items:center;justify-content:space-between;gap:30px}
        .cta h2{font-size:30px;line-height:1.35;margin:8px 0 9px}
        .cta p{color:var(--muted);font-size:14px;margin:0}
        .feedback-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:45px;align-items:start}
        .feedback-copy h2{font-size:32px;line-height:1.35;margin:10px 0}
        .feedback-copy p{color:var(--muted)}
        .form-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);padding:25px;box-shadow:var(--shadow)}
        .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
        label{display:block;font-size:13px;font-weight:800;color:var(--ink)}
        input,select,textarea{
            width:100%;margin-top:7px;padding:10px 13px;border:1px solid #c7d9e9;border-radius:9px;
            background:#fff;color:var(--ink);transition:border .2s,box-shadow .2s
        }
        input,select{height:46px}
        textarea{min-height:105px;resize:vertical}
        input:focus,select:focus,textarea:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(37,99,168,.1);outline:none}
        .form-full{grid-column:1/-1}
        .form-tip{font-size:12px;color:#718296;margin:12px 0 0}
        .form-status{display:none;margin-top:12px;color:var(--success);font-size:13px}
        .site-footer{background:#fff;border-top:1px solid var(--line);padding:45px 0 25px}
        .footer-grid{display:grid;grid-template-columns:1.4fr .8fr .8fr;gap:35px}
        .footer-brand{font-weight:800;color:var(--blue-deep);font-size:17px;margin-bottom:10px}
        .footer-copy{font-size:13px;color:var(--muted);max-width:340px}
        .footer-title{font-size:13px;font-weight:800;margin-bottom:11px}
        .footer-links a{display:block;color:var(--muted);font-size:13px;margin:6px 0}
        .footer-links a:hover{color:var(--blue)}
        .copyright{border-top:1px solid #edf1f5;margin-top:32px;padding-top:18px;color:#8492a1;font-size:12px;display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap}
        @media(max-width:900px){
            .hero-grid,.comparison-wrap,.feedback-grid{grid-template-columns:1fr;gap:32px}
            .feature-layout{grid-template-columns:1fr}
            .hero{padding-top:55px}
            .cta-grid{align-items:flex-start;flex-direction:column}
        }
        @media(max-width:700px){
            .container{width:min(100% - 28px,1160px)}
            .nav-wrap{min-height:68px}
            .brand{font-size:15px;gap:8px}
            .brand-mark{width:33px;height:33px;border-radius:9px}
            .menu-toggle{display:block}
            .main-nav{
                display:none;position:absolute;left:14px;right:14px;top:69px;padding:10px;
                flex-direction:column;align-items:stretch;background:#fff;border:1px solid var(--line);
                border-radius:12px;box-shadow:var(--shadow)
            }
            .main-nav.is-open{display:flex}
            .main-nav a{padding:12px 14px}
            h1{font-size:38px}
            .section{padding:57px 0}
            .video-panel{min-height:280px;padding:13px}
            .video-screen{min-height:250px}
            .collection-grid{grid-template-columns:1fr}
            .compare-item{grid-template-columns:1fr;gap:5px}
            .compare-list{padding:10px 18px}
            .form-grid{grid-template-columns:1fr}
            .form-full{grid-column:auto}
            .cta{padding:28px 23px}
            .cta h2{font-size:26px}
            .footer-grid{grid-template-columns:1fr;gap:21px}
        }
        @media(max-width:430px){
            .hero-actions .btn{width:100%}
            .hero-copy{font-size:15px}
            .filter-bar{align-items:flex-start}
            .screen-meta{font-size:11px}
        }