/* roulang page: index */
:root{
  --ink:#172b3b;--muted:#627487;--blue:#1769aa;--blue-dark:#104d80;--cyan:#dff2f5;
  --paper:#fff;--canvas:#f4f7fb;--line:#dce5ed;--green:#24795f;--gold:#f0bd58;
  --radius:10px;--shadow:0 12px 30px rgba(25,55,82,.08);--max:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--canvas);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI","Noto Sans SC","Microsoft YaHei",sans-serif;line-height:1.7}
a{color:inherit;text-decoration:none}
button{font:inherit}
img{display:block;max-width:100%}
.container{width:min(var(--max),calc(100% - 48px));margin-inline:auto}
.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
.nav{height:76px;display:flex;align-items:center;gap:30px}
.brand{display:flex;align-items:center;gap:11px;min-width:max-content;font-weight:800;font-size:16px}
.brand-mark{width:34px;height:34px;border-radius:9px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:15px;box-shadow:0 5px 12px rgba(23,105,170,.22)}
.nav-links{display:flex;align-items:center;gap:25px;margin-left:auto}
.nav-links a{font-size:14px;color:#536779;transition:color .2s}
.nav-links a:hover,.nav-links a:focus-visible,.nav-links a.active{color:var(--blue-dark)}
.nav-links a.active{font-weight:700}
.nav-age{font-size:12px;color:var(--green);border:1px solid #cde6dc;padding:5px 9px;border-radius:6px}
.menu-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--ink);width:40px;height:40px;border-radius:7px;cursor:pointer}
.hero{padding:46px 0 34px}
.hero-banner{position:relative;overflow:hidden;min-height:390px;background:#143d5c url('https://images.unsplash.com/photo-1519608487953-e999c86e7455?auto=format&fit=crop&w=1800&q=85') center 48%/cover;border-radius:12px;color:white;display:flex;align-items:flex-end;box-shadow:var(--shadow)}
.hero-banner:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(9,35,56,.9),rgba(9,35,56,.52) 54%,rgba(9,35,56,.12))}
.hero-content{position:relative;max-width:760px;padding:42px 48px}
.eyebrow{font-size:12px;letter-spacing:1px;text-transform:uppercase;color:#d9eff7;font-weight:700}
h1{margin:13px 0 12px;font-size:clamp(30px,4vw,48px);line-height:1.22;max-width:700px}
.hero-content h1 span{color:#9de0dc}
.hero-content p{font-size:15px;color:#e5edf2;max-width:700px;margin:0}
.hero-actions{display:flex;align-items:center;gap:12px;margin-top:22px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 18px;border-radius:7px;border:1px solid transparent;font-weight:700;font-size:14px;transition:transform .2s,background .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px)}
.btn:focus-visible,a:focus-visible,button:focus-visible{outline:3px solid #75b9e7;outline-offset:3px}
.btn-primary{background:#fff;color:var(--blue-dark)}
.btn-primary:hover{box-shadow:0 7px 18px rgba(0,0,0,.2)}
.btn-ghost{border-color:rgba(255,255,255,.55);color:white}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.age-strip{display:flex;align-items:center;gap:12px;background:#e9f4f4;border-left:4px solid #318d83;padding:15px 19px;margin-top:18px;border-radius:6px;color:#315b5d;font-size:13px}
.age-strip strong{white-space:nowrap;color:#1c675e}
main section{padding:54px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:25px}
.section-head h2{font-size:25px;line-height:1.3;margin:0 0 7px}
.section-head p{max-width:700px;color:var(--muted);font-size:14px;margin:0}
.section-kicker{color:var(--blue);font-size:12px;font-weight:800;letter-spacing:.5px;margin-bottom:6px}
.benefits{padding-top:24px}
.benefit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.benefit{padding:21px 22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.benefit-number{color:var(--blue);font-size:12px;font-weight:800}
.benefit h3{font-size:17px;margin:8px 0}
.benefit p{color:var(--muted);font-size:13px;margin:0}
.matrix{background:#eaf1f6}
.matrix-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.matrix-item{padding:19px;background:#fff;border:1px solid #dce6ed;border-radius:8px;transition:transform .2s,box-shadow .2s}
.matrix-item:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.matrix-item h3{margin:0 0 7px;font-size:16px}
.matrix-item p{font-size:13px;color:var(--muted);margin:0}
.latest-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.content-card{background:#fff;border:1px solid var(--line);border-radius:9px;overflow:hidden;box-shadow:0 5px 16px rgba(25,55,82,.045);transition:transform .2s,box-shadow .2s}
.content-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.thumb{aspect-ratio:16/9;background:linear-gradient(135deg,#dceaf1,#a8c8d0);position:relative;overflow:hidden}
.thumb img{width:100%;height:100%;object-fit:cover}
.thumb-label{position:absolute;left:11px;top:11px;background:rgba(16,49,70,.83);color:#fff;border-radius:4px;padding:4px 8px;font-size:11px}
.card-copy{padding:15px}
.card-copy h3{font-size:15px;margin:0 0 7px}
.card-copy p{color:var(--muted);font-size:12px;margin:0}
.featured{background:#fff}
.featured-layout{display:grid;grid-template-columns:1.2fr .8fr;gap:24px;align-items:stretch}
.featured-image{min-height:300px;border-radius:10px;overflow:hidden;background:#dce8ec}
.featured-image img{width:100%;height:100%;object-fit:cover}
.featured-copy{padding:14px 5px}
.featured-copy h3{font-size:23px;margin:0 0 12px}
.featured-copy p{font-size:14px;color:var(--muted);margin:0 0 16px}
.tag-row{display:flex;gap:8px;flex-wrap:wrap}
.tag{font-size:11px;padding:5px 9px;border-radius:5px;background:#eaf3f7;color:#28627e}
.news{background:#f0f5f8}
.news-list{display:grid;grid-template-columns:repeat(2,1fr);gap:0 28px}
.news-item{display:grid;grid-template-columns:104px 1fr;gap:15px;padding:16px 0;border-bottom:1px solid var(--line)}
.news-thumb{height:72px;background:#cbdfe4;border-radius:6px;overflow:hidden}
.news-thumb img{width:100%;height:100%;object-fit:cover}
.news-item h3{font-size:14px;margin:2px 0 5px}
.news-item p{font-size:12px;color:var(--muted);margin:0}
.metrics{background:#153e5b;color:#fff}
.metrics .section-head p{color:#c8d9e4}
.metrics .section-kicker{color:#9de0dc}
.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.2)}
.metric{background:#153e5b;padding:22px}
.metric strong{font-size:24px;display:block;color:#b4e8e0}
.metric span{font-size:12px;color:#d1dfe7}
.note{font-size:12px;color:#c2d2dd;margin:14px 0 0}
.reputation{display:grid;grid-template-columns:.8fr 1.2fr;gap:35px;align-items:center}
.quote-panel{background:#e9f3f3;border-radius:10px;padding:26px;border-left:4px solid #4a9a8e}
.quote-panel blockquote{font-size:17px;line-height:1.8;margin:0;color:#31565a}
.quote-panel p{font-size:12px;color:var(--muted);margin:14px 0 0}
.reputation-copy p{color:var(--muted);font-size:14px}
.trust-list{list-style:none;padding:0;margin:15px 0 0;display:grid;gap:9px}
.trust-list li{font-size:13px;padding-left:23px;position:relative}
.trust-list li:before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:800}
.contact{background:#eaf1f6}
.contact-box{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:28px 32px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow)}
.contact-box h2{font-size:22px;margin:0 0 6px}
.contact-box p{color:var(--muted);font-size:13px;margin:0}
.contact-link{background:var(--blue);color:#fff}
.contact-link:hover{background:var(--blue-dark)}
.footer{background:#102f45;color:#d4e0e8;padding:42px 0 20px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px;padding-bottom:30px}
.footer-brand{color:#fff;font-size:16px;font-weight:800}
.footer-copy{font-size:12px;color:#b4c6d2;max-width:300px;margin:11px 0 0}
.footer h3{font-size:13px;color:#fff;margin:0 0 12px}
.footer-links{display:grid;gap:8px}
.footer-links a{font-size:12px;color:#b4c6d2}
.footer-links a:hover{color:#fff}
.copyright{border-top:1px solid rgba(255,255,255,.16);padding-top:16px;font-size:11px;color:#9eb3c0;display:flex;justify-content:space-between;gap:20px}
@media(max-width:1024px){
  .matrix-grid{grid-template-columns:repeat(2,1fr)}
  .latest-grid{grid-template-columns:repeat(3,1fr)}
  .nav{gap:18px}
  .nav-links{gap:16px}
}
@media(max-width:768px){
  .container{width:min(100% - 32px,var(--max))}
  .nav{height:68px}
  .brand{font-size:14px}
  .nav-age{display:none}
  .menu-toggle{display:grid;place-items:center;margin-left:auto}
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;margin:0;padding:14px 20px 20px;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 12px 18px rgba(25,55,82,.08);flex-direction:column;align-items:stretch;gap:0}
  .nav-links.open{display:flex}
  .nav-links a{padding:11px 4px;border-bottom:1px solid #edf1f4}
  .hero{padding-top:24px}
  .hero-banner{min-height:420px}
  .hero-content{padding:30px 25px}
  .benefit-grid{grid-template-columns:1fr}
  .latest-grid{grid-template-columns:repeat(2,1fr)}
  .featured-layout,.reputation{grid-template-columns:1fr}
  .featured-image{min-height:240px}
  .news-list{grid-template-columns:1fr}
  .metric-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:520px){
  .container{width:calc(100% - 28px)}
  .brand{font-size:12px;gap:8px}
  .brand-mark{width:30px;height:30px}
  .hero-banner{min-height:440px;border-radius:8px}
  .hero-content{padding:25px 20px}
  h1{font-size:31px}
  .hero-content p{font-size:14px}
  .hero-actions{align-items:stretch;flex-direction:column}
  .section-head{display:block}
  .section-head h2{font-size:22px}
  main section{padding:42px 0}
  .matrix-grid{grid-template-columns:1fr}
  .latest-grid{gap:10px}
  .card-copy{padding:12px}
  .card-copy h3{font-size:13px}
  .news-item{grid-template-columns:88px 1fr}
  .news-thumb{height:65px}
  .contact-box{align-items:flex-start;flex-direction:column;padding:22px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px 16px}
  .copyright{flex-direction:column;gap:6px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{scroll-behavior:auto!important;transition:none!important}
}

/* roulang page: category1 */
:root{
      --ink:#172b3b;--muted:#627487;--blue:#1769aa;--blue-dark:#104d80;--cyan:#dff2f5;
      --paper:#fff;--canvas:#f4f7fb;--line:#dce5ed;--green:#24795f;--gold:#f0bd58;
      --radius:10px;--shadow:0 12px 30px rgba(25,55,82,.08);--max:1160px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth;scroll-padding-top:90px}
    body{margin:0;background:var(--canvas);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI","Noto Sans SC","Microsoft YaHei",sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    button{font:inherit}
    .container{width:min(var(--max),calc(100% - 48px));margin-inline:auto}
    .site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
    .nav{height:76px;display:flex;align-items:center;gap:30px}
    .brand{display:flex;align-items:center;gap:11px;min-width:max-content;font-weight:800;font-size:16px}
    .brand-mark{width:34px;height:34px;border-radius:9px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:15px;box-shadow:0 5px 12px rgba(23,105,170,.22)}
    .nav-links{display:flex;align-items:center;gap:25px;margin-left:auto}
    .nav-links a{font-size:14px;color:#536779;transition:color .2s}
    .nav-links a:hover,.nav-links a:focus-visible,.nav-links a.active{color:var(--blue-dark)}
    .nav-links a.active{font-weight:700}
    .nav-age{font-size:12px;color:var(--green);border:1px solid #cde6dc;padding:5px 9px;border-radius:6px}
    .menu-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--ink);width:40px;height:40px;border-radius:7px;cursor:pointer}
    a:focus-visible,button:focus-visible{outline:3px solid #75b9e7;outline-offset:3px}
    .hero{padding:38px 0 30px}
    .hero-banner{position:relative;overflow:hidden;min-height:360px;background:#143d5c url('https://images.unsplash.com/photo-1519608487953-e999c86e7455?auto=format&fit=crop&w=1800&q=85') center 48%/cover;border-radius:12px;color:white;display:flex;align-items:flex-end;box-shadow:var(--shadow)}
    .hero-banner:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(9,35,56,.9),rgba(9,35,56,.52) 58%,rgba(9,35,56,.12))}
    .hero-content{position:relative;max-width:780px;padding:42px 48px}
    .eyebrow{font-size:12px;letter-spacing:1px;color:#d9eff7;font-weight:700}
    .hero-content h1{font-size:clamp(32px,4vw,48px);line-height:1.2;margin:11px 0 13px}
    .hero-content h1 span{color:#9de0dc}
    .hero-content p{font-size:15px;color:#e5edf2;max-width:700px;margin:0}
    .hero-actions{display:flex;align-items:center;gap:12px;margin-top:22px}
    .btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 18px;border-radius:7px;border:1px solid transparent;font-weight:700;font-size:14px;transition:transform .2s,background .2s,box-shadow .2s}
    .btn:hover{transform:translateY(-2px)}
    .btn-primary{background:#fff;color:var(--blue-dark)}
    .btn-primary:hover{box-shadow:0 7px 18px rgba(0,0,0,.2)}
    .btn-ghost{border-color:rgba(255,255,255,.55);color:white}
    .btn-ghost:hover{background:rgba(255,255,255,.12)}
    main section{padding:48px 0}
    .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:24px}
    .section-head h2{font-size:25px;line-height:1.3;margin:0 0 7px}
    .section-head p{max-width:700px;color:var(--muted);font-size:14px;margin:0}
    .section-kicker{color:var(--blue);font-size:12px;font-weight:800;margin-bottom:6px}
    .intro-band{background:#fff;border-block:1px solid var(--line)}
    .intro-layout{display:grid;grid-template-columns:1.15fr .85fr;gap:42px;align-items:center}
    .intro-copy h2{font-size:27px;line-height:1.3;margin:0 0 12px}
    .intro-copy p{color:var(--muted);font-size:15px;margin:0}
    .notice{border-left:4px solid var(--green);background:#f1f8f5;padding:20px 22px;border-radius:0 8px 8px 0}
    .notice strong{display:block;margin-bottom:5px;color:#205d4a}
    .notice p{font-size:13px;color:#536e65;margin:0}
    .topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .topic-card{background:var(--paper);border:1px solid var(--line);border-radius:9px;overflow:hidden;box-shadow:0 5px 16px rgba(25,55,82,.045);transition:transform .2s,box-shadow .2s}
    .topic-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
    .topic-card img{width:100%;height:180px;object-fit:cover}
    .topic-copy{padding:18px}
    .topic-copy h3{font-size:17px;margin:0 0 7px}
    .topic-copy p{font-size:13px;color:var(--muted);margin:0}
    .tag-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
    .tag{font-size:11px;padding:4px 9px;border-radius:5px;background:#eaf3f7;color:#28627e}
    .standards{background:#eaf2f7}
    .standard-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:#d6e2ea;border:1px solid #d6e2ea;border-radius:9px;overflow:hidden}
    .standard-item{background:#fff;padding:22px 20px;min-height:150px}
    .standard-number{font-size:12px;color:var(--blue);font-weight:800}
    .standard-item h3{font-size:16px;margin:7px 0}
    .standard-item p{font-size:12px;color:var(--muted);margin:0}
    .feature-row{display:grid;grid-template-columns:300px 1fr;gap:28px;align-items:center;padding:25px 0;border-bottom:1px solid var(--line)}
    .feature-row:last-child{border:0}
    .feature-row img{width:100%;height:180px;object-fit:cover;border-radius:8px}
    .feature-row h3{font-size:19px;margin:0 0 8px}
    .feature-row p{font-size:14px;color:var(--muted);margin:0 0 12px}
    .text-link{color:var(--blue-dark);font-weight:700;font-size:13px}
    .text-link:hover{text-decoration:underline}
    .news-list{display:grid;grid-template-columns:repeat(2,1fr);gap:0 30px}
    .news-item{display:grid;grid-template-columns:110px 1fr;gap:15px;padding:16px 0;border-bottom:1px solid var(--line)}
    .news-item img{width:110px;height:78px;object-fit:cover;border-radius:6px}
    .news-item h3{font-size:14px;margin:2px 0 5px}
    .news-item p{font-size:12px;color:var(--muted);margin:0}
    .faq-section{background:#fff;border-block:1px solid var(--line)}
    .faq-list{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .faq-item{background:#f7f9fb;border:1px solid var(--line);border-radius:8px;padding:18px}
    .faq-item h3{font-size:15px;margin:0 0 7px}
    .faq-item p{font-size:13px;color:var(--muted);margin:0}
    .closing{background:#dff2f5}
    .closing-inner{display:flex;justify-content:space-between;align-items:center;gap:28px}
    .closing h2{font-size:23px;margin:0 0 6px}
    .closing p{font-size:14px;color:#536b78;margin:0}
    .btn-blue{background:var(--blue);color:#fff}
    .btn-blue:hover{background:var(--blue-dark);box-shadow:0 7px 18px rgba(23,105,170,.2)}
    .footer{background:#102f45;color:#d4e0e8;padding:42px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px;padding-bottom:30px}
    .footer-brand{color:#fff;font-size:16px;font-weight:800}
    .footer-copy{font-size:12px;color:#b4c6d2;max-width:300px;margin:11px 0 0}
    .footer h3{font-size:13px;color:#fff;margin:0 0 12px}
    .footer-links{display:grid;gap:8px}
    .footer-links a{font-size:12px;color:#b4c6d2}
    .footer-links a:hover{color:#fff}
    .copyright{border-top:1px solid rgba(255,255,255,.16);padding-top:16px;font-size:11px;color:#9eb3c0;display:flex;justify-content:space-between;gap:20px}
    @media(max-width:1024px){
      .container{width:min(100% - 36px,var(--max))}
      .nav{gap:18px}.nav-links{gap:16px}
      .standard-grid{grid-template-columns:repeat(2,1fr)}
      .topic-grid{grid-template-columns:repeat(2,1fr)}
      .footer-grid{grid-template-columns:1.3fr 1fr 1fr}
      .footer-grid>div:last-child{grid-column:2}
    }
    @media(max-width:768px){
      .nav{height:68px}.brand{font-size:14px}
      .nav-age{display:none}
      .menu-toggle{display:grid;place-items:center;margin-left:auto}
      .nav-links{display:none;position:absolute;top:68px;left:0;right:0;margin:0;padding:14px 20px 20px;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow);flex-direction:column;align-items:stretch;gap:0}
      .nav-links.is-open{display:flex}
      .nav-links a{padding:11px 4px;border-bottom:1px solid #edf1f4}
      .hero{padding:24px 0}
      .hero-banner{min-height:340px}
      .hero-content{padding:30px}
      .intro-layout{grid-template-columns:1fr;gap:20px}
      .feature-row{grid-template-columns:220px 1fr;gap:20px}
      .news-list{grid-template-columns:1fr}
      .closing-inner{align-items:flex-start;flex-direction:column}
      .footer-grid{grid-template-columns:1fr 1fr}
      .footer-grid>div:last-child{grid-column:auto}
    }
    @media(max-width:520px){
      .container{width:calc(100% - 30px)}
      .brand{font-size:13px;gap:8px}
      .brand-mark{width:31px;height:31px}
      .hero-banner{min-height:390px;background-position:58% center}
      .hero-content{padding:25px 21px}
      .hero-content h1{font-size:32px}
      .hero-actions{align-items:stretch;flex-direction:column}
      .section-head{align-items:flex-start;flex-direction:column;gap:8px}
      main section{padding:38px 0}
      .topic-grid,.standard-grid,.faq-list{grid-template-columns:1fr}
      .topic-card img{height:190px}
      .feature-row{grid-template-columns:1fr;padding:20px 0}
      .feature-row img{height:190px}
      .news-item{grid-template-columns:92px 1fr;gap:12px}
      .news-item img{width:92px;height:72px}
      .footer-grid{grid-template-columns:1fr;gap:22px}
      .copyright{flex-direction:column;gap:6px}
    }