/* roulang page: index */
:root{
    --bg:#F6F8FB;
    --surface:#FFFFFF;
    --ink:#10202E;
    --ink-2:#4A6076;
    --ink-3:#8A9AAB;
    --brand:#1B6BA8;
    --brand-dark:#14507F;
    --brand-soft:#E7F1F8;
    --accent:#E0821F;
    --accent-soft:#FDF2E3;
    --line:#E3E9F0;
    --radius-card:14px;
    --radius-btn:10px;
    --radius-chip:999px;
    --shadow-1:0 1px 2px rgba(16,32,46,.04), 0 8px 24px -12px rgba(16,32,46,.12);
    --shadow-2:0 2px 6px rgba(16,32,46,.06), 0 16px 36px -16px rgba(16,32,46,.18);
  }
  *{box-sizing:border-box;}
  html{-webkit-text-size-adjust:100%;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
    font-size:16px;
    line-height:1.8;
    -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%;display:block;}
  a{color:var(--brand);text-decoration:none;transition:color .18s ease-out,border-color .18s ease-out;}
  a:hover{color:var(--brand-dark);}
  h1,h2,h3,h4{margin:0;color:var(--ink);letter-spacing:-.01em;}
  p{margin:0;text-align:left;}
  ul{margin:0;padding:0;list-style:none;}
  button,input,textarea,select{font:inherit;color:inherit;}
  :focus-visible{outline:none;box-shadow:0 0 0 3px rgba(27,107,168,.28);border-radius:var(--radius-btn);}
  .num{font-variant-numeric:tabular-nums;}

  .container{width:100%;max-width:1200px;margin:0 auto;padding-left:20px;padding-right:20px;}
  @media (min-width:768px){.container{padding-left:24px;padding-right:24px;}}
  @media (min-width:1280px){.container{padding-left:32px;padding-right:32px;}}

  .section{padding-top:48px;padding-bottom:48px;}
  @media (min-width:768px){.section{padding-top:64px;padding-bottom:64px;}}
  @media (min-width:1024px){.section{padding-top:88px;padding-bottom:88px;}}

  .eyebrow{font-size:13px;color:var(--ink-3);letter-spacing:.08em;text-transform:uppercase;}
  .h1-hero{font-size:clamp(30px,4.4vw,46px);font-weight:700;line-height:1.25;letter-spacing:-.01em;}
  .h2-sec{font-size:clamp(22px,2.6vw,30px);font-weight:600;line-height:1.32;}
  .h3-card{font-size:18px;font-weight:600;line-height:1.5;}
  .lead{font-size:16px;line-height:1.8;color:var(--ink-2);max-width:760px;}

  /* 导航 */
  .site-header{
    position:sticky;top:0;z-index:60;
    background:rgba(255,255,255,.92);
    backdrop-filter:blur(8px);
    -webkit-backdrop-filter:blur(8px);
    border-bottom:1px solid transparent;
    transition:border-color .2s ease-out;
  }
  .site-header.is-scrolled{border-bottom-color:var(--line);}
  .nav-inner{display:flex;align-items:center;gap:16px;height:68px;}
  .logo{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
  .logo-mark{width:10px;height:10px;border-radius:3px;background:linear-gradient(135deg,var(--brand),var(--accent));}
  .logo-text{font-size:18px;font-weight:700;color:var(--ink);line-height:1.15;letter-spacing:-.01em;}
  .logo-sub{font-size:11px;color:var(--ink-3);line-height:1.2;letter-spacing:.14em;}
  .nav-chips{
    display:flex;align-items:center;gap:6px;flex:1 1 auto;
    overflow-x:auto;flex-wrap:nowrap;
    scrollbar-width:none;-ms-overflow-style:none;
    -webkit-overflow-scrolling:touch;
  }
  .nav-chips::-webkit-scrollbar{display:none;}
  .nav-chip{
    flex:0 0 auto;
    padding:8px 16px;border-radius:var(--radius-chip);
    font-size:14px;color:var(--ink-2);white-space:nowrap;
    border:1px solid transparent;
    transition:background-color .18s ease-out,color .18s ease-out;
  }
  .nav-chip:hover{background:rgba(231,241,248,.6);color:var(--brand);}
  .nav-chip.is-active{background:var(--brand-soft);color:var(--brand);font-weight:600;}
  .nav-cta{flex:0 0 auto;display:none;margin-left:24px;}
  @media (min-width:1024px){.nav-cta{display:inline-flex;}}
  .nav-fade{position:relative;}
  .nav-fade::after{
    content:"";position:absolute;top:0;right:0;bottom:0;width:24px;
    background:linear-gradient(90deg,rgba(255,255,255,0),rgba(255,255,255,.95));
    pointer-events:none;
  }
  @media (min-width:1024px){.nav-fade::after{display:none;}}

  /* 按钮 */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    padding:12px 22px;border-radius:var(--radius-btn);
    font-size:15px;font-weight:600;line-height:1.2;
    border:1px solid transparent;cursor:pointer;
    transition:background-color .18s ease-out,color .18s ease-out,border-color .18s ease-out,transform .18s ease-out,box-shadow .18s ease-out;
  }
  .btn-primary{background:var(--brand);color:#fff;box-shadow:var(--shadow-1);}
  .btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-1px);}
  .btn-primary:active{transform:translateY(0);}
  .btn-secondary{background:#fff;color:var(--brand);border-color:var(--brand);}
  .btn-secondary:hover{background:var(--brand-soft);color:var(--brand-dark);}
  .btn-ghost{background:transparent;color:var(--brand);padding:8px 2px;border-radius:4px;}
  .btn-ghost:hover{color:var(--brand-dark);border-bottom:1px solid var(--brand-dark);}
  .btn-sm{padding:9px 16px;font-size:14px;}

  /* 卡片 */
  .card{
    background:var(--surface);border:1px solid var(--line);
    border-radius:var(--radius-card);box-shadow:var(--shadow-1);
    transition:transform .18s ease-out,box-shadow .18s ease-out;
  }
  .card-hover:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);}
  .card-pad{padding:22px;}
  .card-img{border-radius:10px;overflow:hidden;background:var(--bg);}
  .card-img img{width:100%;height:100%;object-fit:cover;}
  .ratio-16-10{aspect-ratio:16/10;}

  /* 标签 */
  .chip{
    display:inline-flex;align-items:center;gap:6px;
    padding:6px 14px;border-radius:var(--radius-chip);
    background:var(--brand-soft);color:var(--brand);
    font-size:13px;font-weight:600;line-height:1.6;
  }
  .chip-outline{background:#fff;border:1px solid var(--line);color:var(--ink-2);font-weight:500;}
  .badge{
    display:inline-block;padding:3px 9px;border-radius:4px;
    background:var(--brand-soft);color:var(--brand);
    font-size:11px;font-weight:600;letter-spacing:.02em;
  }
  .badge-accent{background:var(--accent-soft);color:#A65A0C;}

  /* Hero */
  .hero{
    position:relative;overflow:hidden;
    background:
      radial-gradient(680px 340px at 88% -12%, rgba(27,107,168,.06), rgba(27,107,168,0) 70%),
      radial-gradient(520px 300px at -6% 106%, rgba(224,130,31,.05), rgba(224,130,31,0) 72%),
      var(--bg);
  }
  .hero-arc{position:absolute;border-radius:50%;border:1px solid rgba(27,107,168,.10);pointer-events:none;}
  .hero-arc.a{width:420px;height:420px;right:-120px;top:-160px;}
  .hero-arc.b{width:260px;height:260px;right:20px;top:-60px;border-color:rgba(224,130,31,.10);}
  .hero-rule{width:44px;height:2px;background:var(--brand);}
  .hero-mini{display:flex;flex-wrap:wrap;align-items:center;gap:14px;font-size:13px;color:var(--ink-3);}
  .hero-mini span.divider{width:1px;height:14px;background:var(--line);}
  .hero-mini strong{color:var(--ink);font-weight:600;font-size:15px;}
  .hero-media{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);box-shadow:var(--shadow-1);padding:10px;}
  .hero-media img{border-radius:10px;width:100%;aspect-ratio:16/10;object-fit:cover;}

  /* 卖点交错 */
  .feature-tall{display:flex;flex-direction:column;gap:18px;height:100%;}
  .feature-mini{padding:20px 22px;}
  .feature-idx{
    display:inline-flex;align-items:center;justify-content:center;
    width:26px;height:26px;border-radius:4px;background:var(--accent-soft);
    color:#A65A0C;font-size:12px;font-weight:700;font-variant-numeric:tabular-nums;
  }

  /* 场景 tabs */
  .tab-row{display:flex;gap:8px;overflow-x:auto;flex-wrap:nowrap;scrollbar-width:none;padding-bottom:4px;}
  .tab-row::-webkit-scrollbar{display:none;}
  .tab-btn{
    flex:0 0 auto;padding:9px 18px;border-radius:var(--radius-chip);
    background:#fff;border:1px solid var(--line);color:var(--ink-2);
    font-size:14px;font-weight:500;cursor:pointer;
    transition:background-color .18s ease-out,color .18s ease-out,border-color .18s ease-out;
  }
  .tab-btn:hover{background:var(--brand-soft);color:var(--brand);}
  .tab-btn.is-active{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600;}
  .tab-panel{display:none;}
  .tab-panel.is-active{display:block;}
  .point-list li{position:relative;padding-left:18px;font-size:15px;color:var(--ink-2);line-height:1.9;}
  .point-list li::before{content:"";position:absolute;left:0;top:.85em;width:10px;height:1px;background:var(--brand);}

  /* 资讯列表 */
  .post-row{
    display:flex;gap:16px;align-items:flex-start;
    padding:18px 12px;border-bottom:1px solid var(--line);
    transition:background-color .18s ease-out;
  }
  .post-row:hover{background:#FAFCFE;}
  .post-row:first-child{border-top:1px solid var(--line);}
  .post-thumb{
    flex:0 0 auto;width:96px;height:64px;border-radius:10px;overflow:hidden;
    background:var(--bg);border:1px solid var(--line);
  }
  @media (min-width:768px){.post-thumb{width:120px;height:80px;}}
  .post-thumb img{width:100%;height:100%;object-fit:cover;}
  .post-title{
    font-size:17px;font-weight:600;color:var(--ink);line-height:1.5;
    display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden;
  }
  .post-excerpt{
    font-size:14px;color:var(--ink-2);line-height:1.7;margin-top:6px;
    display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
  }
  .post-meta{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:10px;font-size:13px;color:var(--ink-3);}
  .empty-state{
    border:1px dashed var(--line);border-radius:var(--radius-card);
    background:#fff;padding:44px 20px;text-align:center;
  }
  .empty-state p{color:var(--ink-3);font-size:14px;}
  .empty-state p.strong{color:var(--ink-2);font-size:16px;font-weight:600;margin-bottom:6px;}

  /* 数据与评价 */
  .stat-block{border-left:1px solid var(--line);padding-left:18px;}
  .stat-num{font-size:clamp(26px,3vw,34px);font-weight:700;color:var(--brand);line-height:1.2;font-variant-numeric:tabular-nums;}
  .stat-label{font-size:13px;color:var(--ink-3);line-height:1.6;}
  .quote-card{height:100%;}
  .quote-card p{font-size:15px;color:var(--ink-2);line-height:1.85;}
  .quote-name{font-size:13px;color:var(--ink-3);margin-top:14px;}
  .partner-row{display:flex;flex-wrap:wrap;gap:14px;align-items:center;}
  .partner-box{
    width:60px;height:28px;border-radius:6px;background:#DCE3EB;opacity:.55;
    display:flex;align-items:center;justify-content:center;
    font-size:10px;color:#7C8B9B;letter-spacing:.04em;
  }
  .hscroll{display:flex;gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:6px;scrollbar-width:none;}
  .hscroll::-webkit-scrollbar{display:none;}
  .hscroll > *{scroll-snap-align:start;flex:0 0 84%;}
  @media (min-width:768px){.hscroll{display:grid;grid-template-columns:repeat(3,1fr);overflow:visible;}.hscroll > *{flex:initial;}}

  /* FAQ */
  .faq-wrap{max-width:860px;margin:0 auto;}
  .faq-item{border-bottom:1px solid var(--line);}
  .faq-item:first-child{border-top:1px solid var(--line);}
  .faq-item details{position:relative;}
  .faq-item details summary{
    list-style:none;cursor:pointer;
    display:flex;align-items:flex-start;gap:14px;
    padding:20px 44px 20px 18px;
    position:relative;
  }
  .faq-item details summary::-webkit-details-marker{display:none;}
  .faq-item details summary::before{
    content:"";position:absolute;left:0;top:22px;bottom:22px;width:4px;
    border-radius:2px;background:var(--brand);
  }
  .faq-q{font-size:16px;font-weight:600;color:var(--ink);line-height:1.7;}
  .faq-item details summary::after{
    content:"+";position:absolute;right:12px;top:18px;
    font-size:20px;line-height:1.2;color:var(--brand);
    transition:transform .2s ease-out;
  }
  .faq-item details[open] summary::after{transform:rotate(45deg);}
  .faq-a{padding:0 44px 22px 18px;font-size:15px;color:var(--ink-2);line-height:1.85;}

  /* CTA */
  .cta-band{background:var(--brand-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
  .cta-card{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);padding:24px;
    display:flex;flex-direction:column;gap:18px;
  }
  @media (min-width:768px){
    .cta-card{flex-direction:row;align-items:center;justify-content:space-between;padding:28px 32px;}
  }

  /* 表单 */
  .field label{display:block;font-size:14px;color:var(--ink-2);margin-bottom:6px;font-weight:500;}
  .field input,.field textarea{
    width:100%;border:1px solid var(--line);border-radius:var(--radius-btn);
    background:#fff;padding:11px 14px;font-size:15px;color:var(--ink);
    transition:border-color .18s ease-out,box-shadow .18s ease-out;
  }
  .field input{height:44px;}
  .field textarea{min-height:44px;resize:vertical;line-height:1.7;}
  .field input:focus,.field textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(27,107,168,.18);outline:none;}
  .field input::placeholder,.field textarea::placeholder{color:var(--ink-3);}
  .form-note{font-size:12px;color:var(--ink-3);margin-top:12px;}
  .form-tip{font-size:13px;color:var(--brand);margin-top:12px;display:none;}

  /* 页脚 */
  .site-footer{background:#EDF2F7;border-top:1px solid var(--line);padding-top:44px;}
  .footer-grid{display:grid;grid-template-columns:1fr;gap:28px;}
  @media (min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr);}}
  @media (min-width:1024px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;}}
  .footer-title{font-size:14px;font-weight:600;color:var(--ink);margin-bottom:14px;letter-spacing:.02em;}
  .footer-link{display:block;font-size:14px;color:var(--ink-2);line-height:2.1;}
  .footer-link:hover{color:var(--brand);}
  .footer-bottom{
    margin-top:36px;border-top:1px solid var(--line);padding:18px 0 22px;
    font-size:13px;color:var(--ink-3);
    display:flex;flex-direction:column;gap:8px;
  }
  @media (min-width:768px){.footer-bottom{flex-direction:row;align-items:center;justify-content:space-between;}}

  /* 移动端底部转化条 */
  .mobile-bar{
    position:fixed;left:0;right:0;bottom:0;z-index:70;
    display:none;align-items:center;gap:12px;
    background:rgba(255,255,255,.98);border-top:1px solid var(--line);
    padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px));
  }
  .mobile-bar .btn{flex:1 1 auto;}
  .mobile-bar .bar-link{flex:0 0 auto;font-size:13px;color:var(--ink-2);}
  @media (max-width:767px){
    .mobile-bar{display:flex;}
    body{padding-bottom:72px;}
  }
  .desk-top-link{
    position:fixed;right:24px;bottom:24px;z-index:65;
    display:none;align-items:center;gap:8px;
    padding:10px 16px;border-radius:var(--radius-chip);
    background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-2);
    font-size:13px;color:var(--ink-2);
  }
  @media (min-width:768px){.desk-top-link.is-visible{display:inline-flex;}}

/* roulang page: article */
:root{
    --bg:#F6F8FB;
    --surface:#FFFFFF;
    --ink:#10202E;
    --ink-2:#4A6076;
    --ink-3:#8A9AAB;
    --brand:#1B6BA8;
    --brand-dark:#14507F;
    --brand-soft:#E7F1F8;
    --accent:#E0821F;
    --accent-soft:#FDF2E3;
    --line:#E3E9F0;
    --radius-card:14px;
    --radius-btn:10px;
    --radius-chip:999px;
    --shadow-1:0 1px 2px rgba(16,32,46,.04), 0 8px 24px -12px rgba(16,32,46,.12);
    --shadow-2:0 2px 6px rgba(16,32,46,.06), 0 16px 36px -16px rgba(16,32,46,.18);
    --font-stack:-apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  }
  *,*::before,*::after{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:var(--font-stack);
    font-size:16px;
    line-height:1.8;
    -webkit-font-smoothing:antialiased;
    font-variant-numeric:tabular-nums;
  }
  img{max-width:100%;display:block;border:0}
  svg{display:block}
  a{color:var(--brand);text-decoration:none;transition:color .18s ease, border-color .18s ease, background-color .18s ease}
  a:hover{color:var(--brand-dark)}
  button,input,textarea{font:inherit;color:inherit}
  h1,h2,h3,h4,p{margin:0}
  ul,ol{margin:0;padding:0;list-style:none}
  .container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
  @media (min-width:768px){.container{padding:0 24px}}
  @media (min-width:1280px){.container{padding:0 32px}}
  .no-scrollbar{scrollbar-width:none;-ms-overflow-style:none}
  .no-scrollbar::-webkit-scrollbar{display:none}

  /* ---------- header ---------- */
  .site-header{
    position:sticky;top:0;z-index:60;
    background:rgba(255,255,255,.92);
    backdrop-filter:blur(8px);
    -webkit-backdrop-filter:blur(8px);
    border-bottom:1px solid transparent;
    transition:border-color .2s ease;
  }
  .site-header.is-scrolled{border-bottom-color:var(--line)}
  .nav-inner{display:flex;align-items:center;gap:16px;height:68px;min-width:0}
  .logo{display:flex;align-items:center;gap:10px;color:var(--ink);flex:0 0 auto}
  .logo:hover{color:var(--ink)}
  .logo-mark{
    width:10px;height:10px;border-radius:3px;background:var(--brand);
    box-shadow:0 0 0 4px var(--brand-soft);flex:0 0 auto;
  }
  .logo-text{display:block;font-size:18px;font-weight:700;letter-spacing:-.01em;line-height:1.15}
  .logo-sub{font-size:10px;font-weight:600;letter-spacing:.16em;color:var(--ink-3)}
  .nav-chips{
    display:flex;align-items:center;gap:6px;margin-left:auto;
    overflow-x:auto;white-space:nowrap;min-width:0;
    scrollbar-width:none;-ms-overflow-style:none;
    -webkit-overflow-scrolling:touch;
  }
  .nav-chips::-webkit-scrollbar{display:none}
  .nav-chip{
    padding:8px 16px;border-radius:var(--radius-chip);font-size:14px;
    color:var(--ink-2);flex:0 0 auto;transition:background-color .18s ease,color .18s ease;
  }
  .nav-chip:hover{background:rgba(231,241,248,.65);color:var(--brand)}
  .nav-chip.is-active{background:var(--brand-soft);color:var(--brand);font-weight:600}
  .nav-cta{flex:0 0 auto;margin-left:8px}
  @media (max-width:767px){
    .nav-inner{height:62px;gap:10px}
    .logo-text{font-size:16px}
    .logo-sub{display:none}
    .nav-chips{margin-left:0;padding-left:4px}
    .nav-cta{display:none}
  }

  /* ---------- buttons ---------- */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    height:46px;padding:0 22px;border-radius:var(--radius-btn);
    font-size:15px;font-weight:600;border:1px solid transparent;background:transparent;
    cursor:pointer;white-space:nowrap;transition:all .18s ease-out;
  }
  .btn-sm{height:38px;padding:0 16px;font-size:14px}
  .btn-primary{background:var(--brand);color:#fff}
  .btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-1)}
  .btn-ghost{background:#fff;border-color:var(--brand);color:var(--brand)}
  .btn-ghost:hover{background:var(--brand-soft);color:var(--brand-dark);transform:translateY(-1px)}
  .btn-text{color:var(--brand);padding:0;height:auto;border:0;font-weight:600}
  .btn-text:hover{color:var(--brand-dark);border-bottom:1px solid var(--brand-dark)}
  a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{
    outline:none;box-shadow:0 0 0 3px rgba(27,107,168,.28);border-radius:var(--radius-btn);
  }

  .chip{
    display:inline-flex;align-items:center;gap:6px;
    padding:6px 14px;border-radius:var(--radius-chip);
    font-size:13px;color:var(--ink-2);background:#fff;border:1px solid var(--line);
  }
  .chip-brand{background:var(--brand-soft);border-color:transparent;color:var(--brand);font-weight:600}
  .badge{
    display:inline-block;padding:3px 9px;border-radius:4px;font-size:11px;
    background:var(--brand-soft);color:var(--brand);font-weight:600;letter-spacing:.02em;
  }

  /* ---------- article hero ---------- */
  .article-hero{
    position:relative;overflow:hidden;
    background:linear-gradient(180deg,#FFFFFF 0%, #F6F8FB 100%);
    border-bottom:1px solid var(--line);
  }
  .article-hero::after{
    content:"";position:absolute;right:-140px;top:-160px;width:460px;height:460px;border-radius:50%;
    background:radial-gradient(circle at 50% 50%, rgba(27,107,168,.07), rgba(27,107,168,0) 68%);
    pointer-events:none;
  }
  .article-hero::before{
    content:"";position:absolute;left:-120px;bottom:-200px;width:380px;height:380px;border-radius:50%;
    background:radial-gradient(circle at 50% 50%, rgba(224,130,31,.06), rgba(224,130,31,0) 70%);
    pointer-events:none;
  }
  .hero-inner{position:relative;z-index:1;padding:26px 0 40px}
  @media (min-width:768px){.hero-inner{padding:34px 0 52px}}
  .breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-3)}
  .breadcrumb a{color:var(--ink-3)}
  .breadcrumb a:hover{color:var(--brand)}
  .breadcrumb span.sep{color:#C6D2DE}
  .article-title{
    margin-top:18px;
    font-size:clamp(28px,4.2vw,44px);
    font-weight:700;line-height:1.28;letter-spacing:-.01em;color:var(--ink);
    max-width:900px;
  }
  .article-lead{
    margin-top:16px;max-width:720px;font-size:16px;line-height:1.85;color:var(--ink-2);
  }
  .meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:22px}
  .meta-item{font-size:13px;color:var(--ink-3)}
  .meta-divider{width:1px;height:14px;background:var(--line)}

  /* ---------- layout ---------- */
  .article-layout{
    display:grid;gap:40px;align-items:start;
    padding:44px 0 64px;
  }
  @media (min-width:1024px){.article-layout{padding:56px 0 84px}}
  @media (min-width:1280px){
    .article-layout{grid-template-columns:minmax(0,1fr) 300px;gap:56px}
  }
  .article-main{min-width:0;width:100%;max-width:760px;margin:0 auto}
  .panel{
    background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);padding:22px;
    transition:transform .18s ease-out, box-shadow .18s ease-out;
  }
  .article-side{min-width:0}
  @media (min-width:1280px){
    .article-side{position:sticky;top:92px}
  }
  .side-title{font-size:15px;font-weight:700;color:var(--ink);margin-bottom:14px}
  .side-list li + li{margin-top:10px}
  .side-list a{display:flex;gap:8px;font-size:14px;color:var(--ink-2);line-height:1.6}
  .side-list a:hover{color:var(--brand)}
  .side-list a::before{
    content:"";flex:0 0 auto;width:6px;height:6px;border-radius:1px;background:var(--brand-soft);
    margin-top:9px;border:1px solid #C9DEEF;
  }
  .side-note{font-size:13px;color:var(--ink-3);line-height:1.8}

  /* ---------- article body ---------- */
  .article-body{font-size:17px;line-height:1.85;color:var(--ink-2)}
  .article-body > *:first-child{margin-top:0}
  .article-body p{margin:0 0 1.2em}
  .article-body h2{
    position:relative;margin:44px 0 16px;padding-left:16px;
    font-size:clamp(20px,2.4vw,26px);font-weight:700;line-height:1.45;color:var(--ink);
  }
  .article-body h2::before{
    content:"";position:absolute;left:0;top:.38em;width:4px;height:18px;border-radius:2px;background:var(--brand);
  }
  .article-body h3{margin:30px 0 12px;font-size:18px;font-weight:600;color:var(--ink);line-height:1.5}
  .article-body h4{margin:24px 0 10px;font-size:16px;font-weight:600;color:var(--ink)}
  .article-body ul,.article-body ol{margin:0 0 1.2em;padding-left:18px}
  .article-body ul > li{position:relative;margin-bottom:10px;padding-left:4px}
  .article-body ul > li::before{
    content:"";position:absolute;left:-16px;top:.72em;width:6px;height:6px;border-radius:1px;background:var(--brand);
  }
  .article-body ol{list-style:decimal;padding-left:22px}
  .article-body ol > li{margin-bottom:10px;padding-left:4px}
  .article-body strong{color:var(--ink);font-weight:600}
  .article-body blockquote{
    margin:24px 0;padding:16px 20px;border-left:3px solid var(--accent);
    background:var(--accent-soft);border-radius:8px;color:var(--ink);
  }
  .article-body img{border-radius:12px;margin:24px auto;height:auto}
  .article-body figure{margin:24px 0}
  .article-body figcaption{font-size:13px;color:var(--ink-3);text-align:center;margin-top:10px}
  .article-body a{border-bottom:1px solid rgba(27,107,168,.35)}
  .article-body a:hover{border-bottom-color:var(--brand-dark)}
  .article-body table{width:100%;border-collapse:collapse;margin:24px 0;font-size:15px}
  .article-body th,.article-body td{border:1px solid var(--line);padding:10px 14px;text-align:left}
  .article-body th{background:var(--bg);color:var(--ink);font-weight:600}
  .article-body tbody tr:nth-child(even){background:rgba(246,248,251,.6)}
  .article-body hr{border:0;border-top:1px solid var(--line);margin:36px 0}

  .empty-state{
    border:1px dashed #CBD8E4;border-radius:var(--radius-card);background:#fff;
    padding:56px 24px;text-align:center;
  }
  .empty-title{font-size:19px;font-weight:700;color:var(--ink)}
  .empty-desc{margin:10px auto 22px;max-width:460px;font-size:15px;color:var(--ink-2)}

  .article-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:40px;padding-top:24px;border-top:1px solid var(--line)}

  /* ---------- sections ---------- */
  .section{padding:56px 0}
  @media (min-width:768px){.section{padding:68px 0}}
  @media (min-width:1024px){.section{padding:88px 0}}
  .section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:28px}
  .section-title{font-size:clamp(21px,2.5vw,29px);font-weight:700;line-height:1.35;color:var(--ink)}
  .section-desc{margin-top:10px;max-width:680px;font-size:15px;color:var(--ink-2)}
  .more-link{font-size:14px;font-weight:600}

  .grid-3{display:grid;gap:20px}
  @media (min-width:640px){.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}}
  @media (min-width:1024px){.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}}

  .card{
    background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);overflow:hidden;display:flex;flex-direction:column;
    transition:transform .18s ease-out, box-shadow .18s ease-out;
  }
  .card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2)}
  .card-thumb{aspect-ratio:16/10;width:100%;object-fit:cover;background:var(--bg)}
  .card-body{padding:20px 22px 24px;display:flex;flex-direction:column;gap:10px;flex:1}
  .card-title{font-size:17px;font-weight:600;line-height:1.5;color:var(--ink)}
  .card-title a{color:var(--ink)}
  .card-title a:hover{color:var(--brand)}
  .card-text{font-size:14px;color:var(--ink-2);line-height:1.8}
  .card-meta{display:flex;align-items:center;gap:10px;margin-top:auto;font-size:13px;color:var(--ink-3)}

  /* ---------- FAQ ---------- */
  .faq-wrap{max-width:860px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);box-shadow:var(--shadow-1);padding:6px 22px}
  .faq-item{border-bottom:1px solid var(--line)}
  .faq-item:last-child{border-bottom:0}
  .faq-item summary{
    position:relative;list-style:none;cursor:pointer;padding:20px 40px 20px 16px;
    font-size:16px;font-weight:600;color:var(--ink);line-height:1.6;
  }
  .faq-item summary::-webkit-details-marker{display:none}
  .faq-item summary::before{
    content:"";position:absolute;left:0;top:24px;width:4px;height:16px;border-radius:2px;background:var(--brand-soft);
    transition:background-color .18s ease;
  }
  .faq-item summary::after{
    content:"";position:absolute;right:10px;top:28px;width:12px;height:12px;
    border-right:2px solid var(--ink-3);border-bottom:2px solid var(--ink-3);
    transform:rotate(45deg);transition:transform .2s ease;
  }
  .faq-item[open] summary::before{background:var(--brand)}
  .faq-item[open] summary::after{transform:rotate(-135deg);border-color:var(--brand)}
  .faq-item summary:hover{color:var(--brand)}
  .faq-answer{padding:0 40px 22px 16px;font-size:15px;color:var(--ink-2);line-height:1.85}

  /* ---------- CTA ---------- */
  .cta-band{background:var(--brand-soft);padding:48px 0}
  @media (min-width:768px){.cta-band{padding:60px 0}}
  .cta-card{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);padding:28px;
    display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:22px;
  }
  .cta-title{font-size:clamp(19px,2.2vw,24px);font-weight:700;color:var(--ink)}
  .cta-text{margin-top:8px;font-size:15px;color:var(--ink-2);max-width:560px}
  .cta-actions{display:flex;flex-wrap:wrap;gap:12px}

  /* ---------- form ---------- */
  .form-panel{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);padding:24px;
  }
  @media (min-width:768px){.form-panel{padding:32px}}
  .form-grid{display:grid;gap:18px}
  @media (min-width:768px){.form-grid{grid-template-columns:3fr 3fr 6fr;align-items:end}}
  .field label{display:block;font-size:14px;color:var(--ink-2);margin-bottom:8px}
  .field input,.field textarea{
    width:100%;border:1px solid var(--line);border-radius:var(--radius-btn);
    padding:12px 14px;font-size:15px;background:#fff;color:var(--ink);
    transition:border-color .18s ease, box-shadow .18s ease;
  }
  .field input{height:44px;padding:0 14px}
  .field textarea{min-height:44px;resize:vertical;line-height:1.7}
  .field input::placeholder,.field textarea::placeholder{color:#AEBBC8}
  .field input:focus,.field textarea:focus{
    outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(27,107,168,.18);
  }
  .form-foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;margin-top:20px}
  .privacy-note{font-size:13px;color:var(--ink-3)}

  /* ---------- footer ---------- */
  .site-footer{background:#EDF2F7;border-top:1px solid var(--line);padding:52px 0 0;margin-top:0}
  .footer-grid{display:grid;gap:32px}
  @media (min-width:768px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
  @media (min-width:1024px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}}
  .footer-title{font-size:14px;font-weight:700;color:var(--ink);margin:0 0 14px}
  .footer-link{display:block;font-size:14px;color:var(--ink-2);margin-bottom:10px;line-height:1.7}
  .footer-link:hover{color:var(--brand)}
  .footer-bottom{
    display:flex;flex-wrap:wrap;gap:8px;justify-content:space-between;
    border-top:1px solid var(--line);margin-top:40px;padding:18px 0 26px;
    font-size:13px;color:var(--ink-3);
  }

  /* ---------- mobile bar ---------- */
  .mobile-bar{
    position:fixed;left:0;right:0;bottom:0;z-index:70;
    display:flex;align-items:center;gap:12px;justify-content:space-between;
    padding:10px 16px calc(10px + env(safe-area-inset-bottom));
    background:#fff;border-top:1px solid var(--line);
  }
  .mobile-bar .btn{flex:1 1 auto;height:44px}
  .mobile-bar .bar-link{flex:0 0 auto;font-size:14px;font-weight:600}
  @media (min-width:768px){.mobile-bar{display:none}}
  @media (max-width:767px){body{padding-bottom:74px}}

/* roulang page: category1 */
:root{
  --bg:#F6F8FB;
  --surface:#FFFFFF;
  --ink:#10202E;
  --ink-2:#4A6076;
  --ink-3:#8A9AAB;
  --brand:#1B6BA8;
  --brand-dark:#14507F;
  --brand-soft:#E7F1F8;
  --accent:#E0821F;
  --accent-soft:#FDF2E3;
  --line:#E3E9F0;
  --radius-card:14px;
  --radius-btn:10px;
  --radius-chip:999px;
  --shadow-1:0 1px 2px rgba(16,32,46,.04), 0 8px 24px -12px rgba(16,32,46,.12);
  --shadow-2:0 2px 6px rgba(16,32,46,.06), 0 16px 36px -16px rgba(16,32,46,.18);
  --font:-apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.8;
  color:var(--ink-2);
  background:var(--bg);
  text-align:left;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0;color:var(--ink);font-weight:600;line-height:1.35;}
h1{font-size:clamp(30px,4.4vw,46px);font-weight:700;line-height:1.25;letter-spacing:-.01em;}
h2{font-size:clamp(22px,2.6vw,30px);}
h3{font-size:18px;}
p{margin:0;}
img{max-width:100%;display:block;}
a{color:var(--brand);text-decoration:none;transition:color .18s ease, border-color .18s ease, background-color .18s ease;}
a:hover{color:var(--brand-dark);}
button,input,textarea,select{font-family:inherit;font-size:inherit;color:inherit;}
ul,ol{margin:0;padding:0;list-style:none;}
.num{font-variant-numeric:tabular-nums;}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
@media (min-width:768px){ .container{padding:0 24px;} }
@media (min-width:1280px){ .container{padding:0 32px;} }

.section{padding:48px 0;}
@media (min-width:768px){ .section{padding:64px 0;} }
@media (min-width:1024px){ .section{padding:88px 0;} }

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.92);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  border-bottom:1px solid transparent;
  transition:border-color .2s ease;
}
.site-header.is-scrolled{border-bottom-color:var(--line);}
.nav-inner{display:flex;align-items:center;gap:14px;height:68px;}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink);flex:0 0 auto;}
.logo:hover{color:var(--ink);}
.logo-mark{width:10px;height:10px;border-radius:3px;background:var(--brand);box-shadow:0 0 0 4px var(--brand-soft);flex:0 0 auto;}
.logo-text{display:block;font-size:19px;font-weight:700;line-height:1.15;letter-spacing:-.01em;color:var(--ink);}
.logo-sub{display:block;font-size:10px;letter-spacing:.16em;color:var(--ink-3);}
.nav-chips{
  display:flex;align-items:center;gap:6px;
  margin-left:auto;
  overflow-x:auto;flex-wrap:nowrap;
  scrollbar-width:none;-ms-overflow-style:none;
}
.nav-chips::-webkit-scrollbar{display:none;}
.nav-fade{
  -webkit-mask-image:linear-gradient(90deg, transparent 0, #000 14px, #000 calc(100% - 14px), transparent 100%);
  mask-image:linear-gradient(90deg, transparent 0, #000 14px, #000 calc(100% - 14px), transparent 100%);
}
.nav-chip{
  flex:0 0 auto;
  padding:8px 15px;border-radius:var(--radius-chip);
  font-size:14px;color:var(--ink-2);white-space:nowrap;
  transition:background-color .18s ease,color .18s ease;
}
.nav-chip:hover{background:rgba(231,241,248,.6);color:var(--brand);}
.nav-chip.is-active{background:var(--brand-soft);color:var(--brand);font-weight:600;}
.nav-cta{flex:0 0 auto;margin-left:18px;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:12px 22px;border-radius:var(--radius-btn);border:1px solid transparent;
  font-size:15px;font-weight:600;cursor:pointer;
  transition:background-color .18s ease, color .18s ease, transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.btn:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(27,107,168,.28);}
.btn-primary{background:var(--brand);color:#fff;box-shadow:var(--shadow-1);}
.btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-2);}
.btn-primary:active{transform:translateY(0);}
.btn-outline{background:#fff;color:var(--brand);border-color:var(--brand);}
.btn-outline:hover{background:var(--brand-soft);color:var(--brand-dark);border-color:var(--brand-dark);}
.btn-ghost{background:transparent;color:var(--brand);padding:6px 0;border-radius:0;}
.btn-ghost:hover{color:var(--brand-dark);border-bottom:1px solid var(--brand-dark);}
.btn-sm{padding:9px 16px;font-size:14px;}
.btn-lg{padding:14px 26px;font-size:16px;}

.badge{
  display:inline-block;padding:3px 10px;border-radius:4px;
  background:var(--brand-soft);color:var(--brand);font-size:12px;font-weight:600;letter-spacing:.02em;
}
.badge-accent{background:var(--accent-soft);color:#B4670E;}

.chip{
  display:inline-flex;align-items:center;
  padding:7px 15px;border-radius:var(--radius-chip);
  border:1px solid var(--line);background:#fff;color:var(--ink-2);
  font-size:13.5px;cursor:default;transition:all .18s ease;
}
.chip:hover{border-color:var(--brand);color:var(--brand);}
.chip.is-active{background:var(--brand-soft);border-color:transparent;color:var(--brand);font-weight:600;}

/* ---------- hero ---------- */
.page-hero{
  position:relative;
  background-color:#EAF1F7;
  background-image:url('/assets/images/backpic/back-1.png');
  background-size:cover;
  background-position:center;
  padding:40px 0 52px;
  overflow:hidden;
}
.page-hero::after{
  content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 82% 18%, rgba(27,107,168,.10), transparent 52%);
  pointer-events:none;
}
.page-hero .container{position:relative;z-index:2;}
.breadcrumb{font-size:13px;color:var(--ink-3);margin-bottom:18px;}
.breadcrumb a{color:var(--ink-3);}
.breadcrumb a:hover{color:var(--brand);}
.breadcrumb span.sep{margin:0 8px;color:#C3CED9;}
.hero-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);
  box-shadow:var(--shadow-1);
  padding:26px 22px;max-width:760px;
}
@media (min-width:768px){ .hero-card{padding:36px 38px;} }
.hero-card h1{margin:14px 0 0;}
.hero-sub{margin-top:14px;font-size:clamp(16px,1.6vw,19px);color:var(--ink);font-weight:600;line-height:1.6;}
.hero-desc{margin-top:12px;font-size:15.5px;color:var(--ink-2);max-width:720px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px;}
.hero-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:0;
  margin-top:24px;padding-top:18px;border-top:1px solid var(--line);
}
.hero-meta li{font-size:13.5px;color:var(--ink-3);padding:0 16px;border-left:1px solid var(--line);}
.hero-meta li:first-child{padding-left:0;border-left:none;}
.hero-meta li strong{color:var(--ink);font-weight:600;font-size:15px;}

/* ---------- filter row ---------- */
.filter-row{display:flex;flex-wrap:wrap;gap:8px;padding:26px 0 0;}
.filter-label{font-size:13px;color:var(--ink-3);align-self:center;margin-right:4px;}

/* ---------- section head ---------- */
.section-head{max-width:780px;margin-bottom:28px;}
.section-head .eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;color:var(--brand);letter-spacing:.04em;
}
.section-head .eyebrow::before{content:"";width:18px;height:1px;background:var(--brand);display:inline-block;}
.section-head h2{margin-top:10px;}
.section-head p{margin-top:12px;font-size:15.5px;color:var(--ink-2);}

/* ---------- step list ---------- */
.step-list{display:flex;flex-direction:column;gap:22px;}
.step-item{
  display:grid;grid-template-columns:1fr;gap:20px;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);
  box-shadow:var(--shadow-1);
  padding:20px;
  transition:transform .18s ease-out, box-shadow .18s ease-out;
}
.step-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);}
@media (min-width:900px){
  .step-item{grid-template-columns:5fr 7fr;gap:30px;padding:24px;align-items:center;}
  .step-item.is-reverse .step-media{order:2;}
  .step-item.is-reverse .step-body{order:1;}
}
.step-media{border-radius:10px;overflow:hidden;background:var(--bg);border:1px solid var(--line);}
.step-media img{width:100%;aspect-ratio:16/10;object-fit:cover;}
.step-num{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:34px;height:24px;padding:0 8px;
  background:var(--accent-soft);color:#B4670E;
  border-radius:4px;font-size:13px;font-weight:700;letter-spacing:.06em;
}
.step-body h3{margin-top:12px;font-size:19px;}
.step-body p{margin-top:10px;font-size:15px;color:var(--ink-2);}
.point-list{margin-top:14px;display:flex;flex-direction:column;gap:9px;}
.point-list li{position:relative;padding-left:18px;font-size:14.5px;color:var(--ink-2);}
.point-list li::before{
  content:"";position:absolute;left:0;top:11px;width:10px;height:1px;background:var(--brand);
}

/* ---------- scene cards ---------- */
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);
  box-shadow:var(--shadow-1);padding:22px;
  transition:transform .18s ease-out, box-shadow .18s ease-out;
  height:100%;
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);}
.card h3{font-size:17px;}
.card p{margin-top:10px;font-size:14.5px;color:var(--ink-2);}
.card-thumb{border-radius:10px;overflow:hidden;border:1px solid var(--line);margin-bottom:16px;}
.card-thumb img{width:100%;aspect-ratio:16/10;object-fit:cover;}

/* ---------- dark panel ---------- */
.dark-panel{
  background:linear-gradient(160deg,#10202E 0%,#16314A 100%);
  border-radius:var(--radius-card);
  padding:32px 24px;
  color:#C7D6E4;
  position:relative;overflow:hidden;
}
.dark-panel::before{
  content:"";position:absolute;right:-60px;top:-60px;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle, rgba(27,107,168,.34), transparent 68%);
}
.dark-panel > *{position:relative;z-index:1;}
@media (min-width:768px){ .dark-panel{padding:44px 40px;} }
.dark-panel h2{color:#fff;}
.dark-panel .lead{margin-top:12px;font-size:15px;color:#A9BCCE;max-width:640px;}
.stat-row{display:grid;grid-template-columns:1fr;gap:18px;margin-top:28px;}
@media (min-width:640px){ .stat-row{grid-template-columns:repeat(3,1fr);} }
.stat{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:12px;padding:18px;}
.stat .num{display:block;font-size:26px;font-weight:700;color:#7FC0EA;line-height:1.2;}
.stat .label{display:block;margin-top:6px;font-size:13.5px;color:#9FB4C7;}
.check-grid{display:grid;grid-template-columns:1fr;gap:14px;margin-top:26px;}
@media (min-width:768px){ .check-grid{grid-template-columns:repeat(2,1fr);gap:18px 28px;} }
.check-grid li{
  display:flex;gap:12px;align-items:flex-start;
  font-size:14.5px;color:#C7D6E4;line-height:1.75;
  padding-bottom:14px;border-bottom:1px solid rgba(255,255,255,.08);
}
.check-grid li span.mark{
  flex:0 0 auto;width:20px;height:20px;margin-top:5px;border-radius:5px;
  background:rgba(224,130,31,.2);border:1px solid rgba(224,130,31,.5);
  color:#F0B269;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center;
}

/* ---------- faq ---------- */
.faq-wrap{max-width:860px;margin:0 auto;}
.faq-item{border-bottom:1px solid var(--line);}
.faq-item summary{
  list-style:none;cursor:pointer;position:relative;
  padding:20px 40px 20px 18px;
  border-left:4px solid transparent;
  font-size:16.5px;font-weight:600;color:var(--ink);
  transition:border-color .18s ease,color .18s ease,background-color .18s ease;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"";position:absolute;right:14px;top:50%;width:12px;height:12px;
  transform:translateY(-50%) rotate(0deg);
  border-right:1.5px solid var(--brand);border-bottom:1.5px solid var(--brand);
  transition:transform .2s ease;
}
.faq-item summary:hover{border-left-color:var(--brand);color:var(--brand);background:#FAFCFE;}
.faq-item[open] summary{border-left-color:var(--brand);color:var(--brand);}
.faq-item[open] summary::after{transform:translateY(-70%) rotate(225deg);}
.faq-item .faq-body{padding:0 40px 22px 18px;font-size:15px;color:var(--ink-2);}
.faq-item summary:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(27,107,168,.28);}

/* ---------- cta + form ---------- */
.cta-band{
  background:var(--brand-soft);
  border-radius:var(--radius-card);
  padding:26px 22px;
}
@media (min-width:768px){ .cta-band{padding:34px 36px;} }
.cta-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);
  box-shadow:var(--shadow-1);padding:24px;
}
@media (min-width:768px){ .cta-card{padding:28px 30px;} }
.cta-head{display:flex;flex-direction:column;gap:18px;}
@media (min-width:900px){ .cta-head{flex-direction:row;align-items:center;justify-content:space-between;} }
.cta-head h2{font-size:clamp(20px,2.2vw,26px);}
.cta-head p{margin-top:8px;font-size:15px;color:var(--ink-2);max-width:560px;}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;}

.form-grid{display:grid;grid-template-columns:1fr;gap:16px;margin-top:26px;}
@media (min-width:768px){ .form-grid{grid-template-columns:3fr 3fr 6fr;} }
.field{display:flex;flex-direction:column;gap:7px;}
.field label{font-size:14px;color:var(--ink-2);}
.field input,.field textarea{
  width:100%;min-height:44px;padding:10px 14px;
  background:#fff;border:1px solid var(--line);border-radius:10px;
  font-size:15px;color:var(--ink);
  transition:border-color .18s ease, box-shadow .18s ease;
}
.field textarea{min-height:110px;resize:vertical;}
.field input:focus,.field textarea:focus{
  outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(27,107,168,.28);
}
.field input::placeholder,.field textarea::placeholder{color:#AEBBC8;}
.form-foot{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:18px;}
.form-note{font-size:13px;color:var(--ink-3);}

/* ---------- footer ---------- */
.site-footer{
  background:#EDF2F7;border-top:1px solid var(--line);
  padding:44px 0 24px;margin-top:56px;
}
.footer-grid{display:grid;grid-template-columns:1fr;gap:30px;}
@media (min-width:768px){ .footer-grid{grid-template-columns:repeat(2,1fr);} }
@media (min-width:1024px){ .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px;} }
.footer-title{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:14px;}
.footer-link{display:block;font-size:14px;color:var(--ink-2);line-height:2;}
a.footer-link:hover{color:var(--brand);}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between;
  margin-top:34px;padding-top:18px;border-top:1px solid var(--line);
  font-size:13px;color:var(--ink-3);
}

/* ---------- mobile bar ---------- */
.mobile-bar{display:none;}
@media (max-width:767px){
  body{padding-bottom:80px;}
  .mobile-bar{
    display:flex;align-items:center;justify-content:space-between;gap:12px;
    position:fixed;left:0;right:0;bottom:0;z-index:70;
    height:60px;padding:0 16px calc(0px + env(safe-area-inset-bottom, 0px));
    background:#fff;border-top:1px solid var(--line);
  }
  .mobile-bar .btn{flex:1 1 auto;}
  .mobile-bar .mobile-bar-link{flex:0 0 auto;font-size:14px;color:var(--ink-2);}
  .nav-inner{gap:10px;height:62px;}
  .logo-text{font-size:15px;}
  .logo-sub{display:none;}
  .nav-cta{margin-left:8px;}
  .nav-chip{padding:7px 12px;font-size:13px;}
  .hero-meta li{padding:0 12px;font-size:13px;}
}
@media (max-width:520px){
  .logo-mark{width:8px;height:8px;box-shadow:0 0 0 3px var(--brand-soft);}
  .logo-text{font-size:14px;}
  .btn-sm{padding:8px 12px;font-size:13px;}
  .nav-chips{gap:4px;}
}

/* roulang page: category2 */
:root{
    --bg:#F6F8FB;
    --surface:#FFFFFF;
    --ink:#10202E;
    --ink-2:#4A6076;
    --ink-3:#8A9AAB;
    --brand:#1B6BA8;
    --brand-dark:#14507F;
    --brand-soft:#E7F1F8;
    --accent:#E0821F;
    --accent-soft:#FDF2E3;
    --line:#E3E9F0;
    --radius-card:14px;
    --radius-btn:10px;
    --radius-chip:999px;
    --shadow-1:0 1px 2px rgba(16,32,46,.04), 0 8px 24px -12px rgba(16,32,46,.12);
    --shadow-2:0 2px 6px rgba(16,32,46,.06), 0 16px 36px -16px rgba(16,32,46,.18);
  }

  *,*::before,*::after{box-sizing:border-box;}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink-2);
    font-family:-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
    font-size:16px;
    line-height:1.8;
    text-align:left;
    font-variant-numeric:tabular-nums;
    padding-bottom:0;
  }
  img{max-width:100%;display:block;border-style:none;}
  a{color:var(--brand);text-decoration:none;transition:color .18s ease-out,border-color .18s ease-out,background-color .18s ease-out;}
  a:hover{color:var(--brand-dark);}
  button,input,textarea,select{font:inherit;color:inherit;}
  h1,h2,h3,h4,p{margin:0;}
  ul{margin:0;padding:0;list-style:none;}

  .container{
    width:100%;
    max-width:1200px;
    margin:0 auto;
    padding:0 20px;
  }
  @media (min-width:768px){ .container{padding:0 24px;} }
  @media (min-width:1280px){ .container{padding:0 32px;} }

  /* ---------- 导航 ---------- */
  .site-header{
    position:sticky;
    top:0;
    z-index:60;
    background:rgba(255,255,255,.92);
    -webkit-backdrop-filter:blur(8px);
    backdrop-filter:blur(8px);
    border-bottom:1px solid transparent;
    transition:border-color .2s ease-out,box-shadow .2s ease-out;
  }
  .site-header.is-scrolled{
    border-bottom-color:var(--line);
    box-shadow:0 6px 20px -18px rgba(16,32,46,.35);
  }
  .nav-inner{
    display:flex;
    align-items:center;
    gap:16px;
    min-height:68px;
  }
  .logo{
    display:flex;
    align-items:center;
    gap:10px;
    flex:0 0 auto;
    color:var(--ink);
  }
  .logo:hover{color:var(--ink);}
  .logo-mark{
    width:12px;height:12px;
    border-radius:3px;
    background:linear-gradient(135deg,var(--brand) 0%,#3E92CC 55%,var(--accent) 100%);
    box-shadow:0 0 0 4px var(--brand-soft);
    flex:0 0 auto;
  }
  .logo-text{
    display:block;
    font-size:18px;
    font-weight:700;
    letter-spacing:-.01em;
    color:var(--ink);
    line-height:1.2;
  }
  .logo-sub{
    font-size:10px;
    letter-spacing:.16em;
    color:var(--ink-3);
    line-height:1.4;
  }
  @media (min-width:1024px){ .logo-text{font-size:19px;} }

  .nav-chips{
    display:flex;
    align-items:center;
    gap:6px;
    overflow-x:auto;
    white-space:nowrap;
    flex:1 1 auto;
    scrollbar-width:none;
    -ms-overflow-style:none;
    padding:6px 2px;
    -webkit-mask-image:linear-gradient(90deg,transparent 0,#000 14px,#000 calc(100% - 14px),transparent 100%);
    mask-image:linear-gradient(90deg,transparent 0,#000 14px,#000 calc(100% - 14px),transparent 100%);
  }
  .nav-chips::-webkit-scrollbar{display:none;}
  .nav-chip{
    display:inline-block;
    padding:7px 15px;
    border-radius:var(--radius-chip);
    font-size:14px;
    color:var(--ink-2);
    border:1px solid transparent;
    transition:background-color .18s ease-out,color .18s ease-out;
  }
  .nav-chip:hover{background:rgba(231,241,248,.6);color:var(--brand);}
  .nav-chip.is-active{
    background:var(--brand-soft);
    color:var(--brand);
    font-weight:600;
  }
  .nav-cta{flex:0 0 auto;margin-left:8px;}

  .btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:6px;
    border-radius:var(--radius-btn);
    padding:11px 20px;
    font-size:15px;
    font-weight:600;
    border:1px solid transparent;
    cursor:pointer;
    transition:background-color .18s ease-out,color .18s ease-out,border-color .18s ease-out,transform .18s ease-out,box-shadow .18s ease-out;
    line-height:1.2;
  }
  .btn:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(27,107,168,.28);}
  .btn-primary{background:var(--brand);color:#fff;box-shadow:var(--shadow-1);}
  .btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-1px);}
  .btn-primary:active{transform:translateY(0);}
  .btn-ghost{background:#fff;color:var(--brand);border-color:var(--brand);}
  .btn-ghost:hover{background:var(--brand-soft);color:var(--brand-dark);border-color:var(--brand-dark);}
  .btn-underline{background:transparent;color:var(--brand);padding:11px 4px;border-bottom:1px solid transparent;border-radius:0;}
  .btn-underline:hover{color:var(--brand-dark);border-bottom-color:var(--brand-dark);}
  .btn-sm{padding:9px 16px;font-size:14px;}

  /* ---------- 通用 ---------- */
  .section{padding:48px 0;}
  @media (min-width:768px){ .section{padding:64px 0;} }
  @media (min-width:1024px){ .section{padding:92px 0;} }
  .section-tight{padding:36px 0;}
  @media (min-width:1024px){ .section-tight{padding:60px 0;} }

  h1,h2,h3{color:var(--ink);font-weight:700;letter-spacing:-.01em;}
  h1{font-size:clamp(30px,4.4vw,46px);line-height:1.25;}
  h2{font-size:clamp(22px,2.6vw,30px);font-weight:600;line-height:1.35;}
  h3{font-size:19px;font-weight:600;line-height:1.5;}
  .lead{font-size:16px;color:var(--ink-2);max-width:760px;line-height:1.85;}
  .muted{color:var(--ink-3);font-size:13px;}
  .section-head{margin-bottom:26px;}
  .section-head h2{margin-bottom:12px;}
  .section-head p{max-width:760px;color:var(--ink-2);}
  .divider{height:1px;background:var(--line);border:0;margin:0;}

  .eyebrow{
    display:inline-flex;
    align-items:center;
    gap:8px;
    font-size:13px;
    color:var(--brand);
    background:var(--brand-soft);
    border-radius:var(--radius-chip);
    padding:5px 13px;
    margin-bottom:16px;
  }
  .crumb{font-size:13px;color:var(--ink-3);display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:18px;}
  .crumb a{color:var(--ink-3);}
  .crumb a:hover{color:var(--brand);}
  .crumb span.sep{color:#C6D2DE;}

  .badge{
    display:inline-block;
    background:var(--brand-soft);
    color:var(--brand-dark);
    border-radius:4px;
    font-size:11.5px;
    padding:2px 8px;
    line-height:1.6;
  }
  .badge-accent{background:var(--accent-soft);color:#9A570F;}

  .card{
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);
    transition:transform .18s ease-out,box-shadow .18s ease-out,border-color .18s ease-out;
  }
  .card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);}

  .num-square{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    width:28px;height:28px;
    border-radius:6px;
    background:var(--accent-soft);
    color:var(--accent);
    font-size:12.5px;
    font-weight:700;
    letter-spacing:.02em;
  }

  .filter-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px;}
  .filter-chip{
    border:1px solid var(--line);
    background:#fff;
    color:var(--ink-2);
    border-radius:var(--radius-chip);
    font-size:13.5px;
    padding:7px 15px;
    cursor:pointer;
    transition:all .18s ease-out;
  }
  .filter-chip:hover{border-color:var(--brand);color:var(--brand);}
  .filter-chip.is-on{background:var(--brand-soft);border-color:#CFE3F2;color:var(--brand);font-weight:600;}
  .filter-chip:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(27,107,168,.28);}

  /* ---------- Hero ---------- */
  .hero{
    position:relative;
    overflow:hidden;
    background:
      radial-gradient(760px 320px at 88% -10%,rgba(27,107,168,.07) 0%,rgba(27,107,168,0) 70%),
      radial-gradient(520px 260px at 4% 6%,rgba(224,130,31,.05) 0%,rgba(224,130,31,0) 72%),
      var(--bg);
  }
  .hero::after{
    content:"";
    position:absolute;
    right:-120px;top:-90px;
    width:460px;height:300px;
    border-radius:50%;
    border:1px solid rgba(27,107,168,.10);
    box-shadow:0 0 0 40px rgba(27,107,168,.035),0 0 0 90px rgba(27,107,168,.02);
    pointer-events:none;
  }
  .hero-inner{
    position:relative;
    display:grid;
    grid-template-columns:1fr;
    gap:32px;
    padding:40px 0 48px;
  }
  @media (min-width:1024px){
    .hero-inner{grid-template-columns:7fr 5fr;gap:48px;padding:56px 0 76px;align-items:center;}
  }
  .hero h1{margin-bottom:16px;}
  .hero h1 em{font-style:normal;color:var(--brand);}
  .hero-sub{font-size:17px;color:var(--ink-2);max-width:620px;line-height:1.85;}
  .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px;}
  .hero-facts{
    display:flex;
    flex-wrap:wrap;
    gap:0;
    margin-top:28px;
    align-items:center;
  }
  .hero-facts span{
    font-size:13.5px;
    color:var(--ink-3);
    padding:0 16px;
    border-left:1px solid var(--line);
  }
  .hero-facts span:first-child{padding-left:0;border-left:0;}
  .hero-facts strong{color:var(--ink);font-weight:600;}

  .hero-media{
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);
    padding:12px;
  }
  .hero-media img{
    width:100%;
    height:210px;
    object-fit:cover;
    border-radius:10px;
  }
  @media (min-width:768px){ .hero-media img{height:250px;} }
  @media (min-width:1024px){ .hero-media img{height:280px;} }
  .hero-media figcaption{
    font-size:13px;
    color:var(--ink-3);
    padding:12px 4px 2px;
  }

  /* ---------- 布局：主内容 + 粘性侧栏 ---------- */
  .layout{
    display:grid;
    grid-template-columns:1fr;
    gap:28px;
  }
  @media (min-width:1024px){
    .layout{grid-template-columns:9fr 3fr;gap:32px;align-items:start;}
  }
  .sticky-side{position:relative;}
  @media (min-width:1024px){
    .sticky-side{position:sticky;top:88px;}
  }

  /* ---------- 模块卡片 ---------- */
  .module-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:20px;
  }
  @media (min-width:640px){ .module-grid{grid-template-columns:repeat(2,1fr);} }
  @media (min-width:1024px){ .module-grid{grid-template-columns:repeat(3,1fr);gap:18px;} }

  .module-card{
    display:flex;
    flex-direction:column;
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);
    overflow:hidden;
    transition:transform .18s ease-out,box-shadow .18s ease-out;
  }
  .module-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);}
  .module-card img{
    width:100%;
    aspect-ratio:16/10;
    object-fit:cover;
    border-radius:10px 10px 0 0;
    background:var(--bg);
  }
  .module-body{padding:18px;display:flex;flex-direction:column;gap:10px;flex:1 1 auto;}
  .module-body h3{font-size:17px;}
  .module-body p{font-size:14px;color:var(--ink-2);line-height:1.8;}
  .module-tags{display:flex;flex-wrap:wrap;gap:6px;}
  .module-link{
    margin-top:auto;
    font-size:13.5px;
    font-weight:600;
    color:var(--brand);
    border-bottom:1px solid transparent;
    align-self:flex-start;
  }
  .module-link:hover{border-bottom-color:var(--brand-dark);color:var(--brand-dark);}

  /* ---------- 侧栏 ---------- */
  .side-card{
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);
    padding:20px;
  }
  .side-card + .side-card{margin-top:18px;}
  .side-title{font-size:15px;font-weight:600;color:var(--ink);margin-bottom:12px;display:flex;align-items:center;gap:8px;}
  .side-title::before{content:"";width:4px;height:14px;border-radius:2px;background:var(--brand);display:inline-block;}
  .quick-list li{border-bottom:1px solid var(--line);}
  .quick-list li:last-child{border-bottom:0;}
  .quick-list a{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:8px;
    padding:11px 0;
    font-size:14px;
    color:var(--ink-2);
  }
  .quick-list a:hover{color:var(--brand);}
  .quick-list a span.arrow{color:var(--ink-3);font-size:12px;}

  /* ---------- 流程 ---------- */
  .steps{
    display:grid;
    grid-template-columns:1fr;
    gap:18px;
  }
  @media (min-width:640px){ .steps{grid-template-columns:repeat(2,1fr);} }
  @media (min-width:1024px){ .steps{grid-template-columns:repeat(4,1fr);} }
  .step{
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-card);
    padding:22px;
    position:relative;
    transition:transform .18s ease-out,box-shadow .18s ease-out;
  }
  .step:hover{transform:translateY(-2px);box-shadow:var(--shadow-1);}
  .step h3{font-size:16.5px;margin:14px 0 8px;}
  .step p{font-size:14px;color:var(--ink-2);line-height:1.8;}

  /* ---------- 场景清单 ---------- */
  .scene-list{
    display:grid;
    grid-template-columns:1fr;
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-card);
    overflow:hidden;
  }
  @media (min-width:768px){ .scene-list{grid-template-columns:1fr 1fr;} }
  .scene-item{
    padding:20px 22px;
    border-bottom:1px solid var(--line);
    display:flex;
    gap:14px;
    align-items:flex-start;
  }
  @media (min-width:768px){
    .scene-item:nth-child(odd){border-right:1px solid var(--line);}
  }
  .scene-item:last-child{border-bottom:0;}
  @media (min-width:768px){
    .scene-item:nth-last-child(2){border-bottom:0;}
  }
  .scene-item .line-mark{
    flex:0 0 auto;
    width:14px;height:1px;
    background:var(--brand);
    margin-top:14px;
  }
  .scene-item h3{font-size:15.5px;margin-bottom:6px;}
  .scene-item p{font-size:14px;color:var(--ink-2);line-height:1.8;}

  /* ---------- 深色排行 ---------- */
  .rank-band{
    position:relative;
    overflow:hidden;
    background:#0F1F2C;
    color:#C9D8E4;
    border-radius:var(--radius-card);
    padding:36px 24px;
  }
  @media (min-width:768px){ .rank-band{padding:48px 44px;} }
  .rank-band::before{
    content:"";
    position:absolute;
    right:-80px;bottom:-120px;
    width:420px;height:300px;
    border-radius:50%;
    border:1px solid rgba(255,255,255,.06);
    box-shadow:0 0 0 34px rgba(255,255,255,.025),0 0 0 74px rgba(255,255,255,.015);
    pointer-events:none;
  }
  .rank-band h2{color:#fff;}
  .rank-band .eyebrow{background:rgba(255,255,255,.08);color:#9FC6E4;}
  .rank-head{display:grid;gap:14px;margin-bottom:28px;position:relative;}
  @media (min-width:1024px){ .rank-head{grid-template-columns:8fr 4fr;align-items:end;} }
  .rank-head p{font-size:14.5px;color:#9FB4C4;max-width:520px;}
  .rank-list{position:relative;display:grid;gap:16px;}
  .rank-item{
    display:grid;
    grid-template-columns:28px 1fr auto;
    gap:14px;
    align-items:center;
    padding-bottom:16px;
    border-bottom:1px solid rgba(255,255,255,.08);
  }
  .rank-item:last-child{border-bottom:0;padding-bottom:0;}
  .rank-no{
    font-size:12.5px;
    color:#7FA3BE;
    border:1px solid rgba(255,255,255,.14);
    border-radius:4px;
    width:28px;height:28px;
    display:flex;align-items:center;justify-content:center;
  }
  .rank-name{font-size:15px;color:#EAF2F8;margin-bottom:8px;}
  .rank-bar{height:6px;border-radius:999px;background:rgba(255,255,255,.09);overflow:hidden;}
  .rank-bar i{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,#3E92CC,#1B6BA8);}
  .rank-bar i.hot{background:linear-gradient(90deg,#E0821F,#F0A048);}
  .rank-val{font-size:13px;color:#8FAFC6;}

  /* ---------- FAQ ---------- */
  .faq-wrap{max-width:860px;margin:0 auto;}
  .faq-item{border-bottom:1px solid var(--line);}
  .faq-item:first-child{border-top:1px solid var(--line);}
  .faq-item summary{
    list-style:none;
    cursor:pointer;
    padding:20px 44px 20px 20px;
    position:relative;
    font-size:16px;
    font-weight:600;
    color:var(--ink);
    border-left:4px solid var(--brand);
    transition:background-color .18s ease-out;
  }
  .faq-item summary::-webkit-details-marker{display:none;}
  .faq-item summary:hover{background:#FAFCFE;}
  .faq-item summary:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(27,107,168,.28);}
  .faq-item summary::after{
    content:"+";
    position:absolute;
    right:18px;
    top:50%;
    transform:translateY(-50%);
    color:var(--brand);
    font-size:20px;
    font-weight:400;
    line-height:1;
    transition:transform .2s ease-out;
  }
  .faq-item[open] summary::after{transform:translateY(-50%) rotate(45deg);}
  .faq-answer{padding:0 24px 22px 24px;font-size:14.5px;color:var(--ink-2);line-height:1.9;border-left:4px solid var(--brand-soft);}

  /* ---------- CTA ---------- */
  .cta-band{
    background:var(--brand-soft);
    border-radius:var(--radius-card);
    padding:26px;
    border:1px solid #D8E9F5;
  }
  @media (min-width:1024px){ .cta-band{padding:34px 38px;} }
  .cta-inner{
    background:var(--surface);
    border-radius:12px;
    padding:24px;
    box-shadow:var(--shadow-1);
    display:grid;
    gap:18px;
  }
  @media (min-width:1024px){
    .cta-inner{grid-template-columns:8fr 4fr;align-items:center;gap:32px;padding:26px 30px;}
  }
  .cta-inner h3{font-size:20px;margin-bottom:8px;}
  .cta-inner p{font-size:14.5px;color:var(--ink-2);}
  .cta-actions{display:flex;flex-wrap:wrap;gap:12px;}

  /* ---------- 表单 ---------- */
  .form-panel{
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);
    padding:24px;
  }
  @media (min-width:768px){ .form-panel{padding:32px;} }
  .form-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:18px;
  }
  @media (min-width:768px){
    .form-grid{grid-template-columns:3fr 3fr 6fr;}
  }
  .field{display:flex;flex-direction:column;gap:8px;}
  .field label{font-size:14px;color:var(--ink-2);}
  .field input,.field textarea{
    width:100%;
    border:1px solid var(--line);
    border-radius:var(--radius-btn);
    background:#fff;
    padding:11px 14px;
    font-size:14.5px;
    color:var(--ink);
    transition:border-color .18s ease-out,box-shadow .18s ease-out;
  }
  .field input{height:44px;}
  .field textarea{min-height:96px;resize:vertical;line-height:1.7;}
  .field input::placeholder,.field textarea::placeholder{color:#AEBBC8;}
  .field input:focus,.field textarea:focus{
    outline:none;
    border-color:var(--brand);
    box-shadow:0 0 0 3px rgba(27,107,168,.18);
  }
  .form-foot{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:14px;
    margin-top:20px;
  }
  .form-note{font-size:12.5px;color:var(--ink-3);}

  /* ---------- 页脚 ---------- */
  .site-footer{
    background:#EDF2F7;
    border-top:1px solid var(--line);
    margin-top:48px;
    padding:44px 0 0;
  }
  @media (min-width:1024px){ .site-footer{margin-top:72px;padding-top:56px;} }
  .footer-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:28px;
    padding-bottom:32px;
  }
  @media (min-width:768px){ .footer-grid{grid-template-columns:1fr 1fr;gap:32px;} }
  @media (min-width:1024px){ .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;} }
  .footer-title{
    font-size:14px;
    font-weight:600;
    color:var(--ink);
    margin-bottom:14px;
  }
  .footer-link{
    display:block;
    font-size:14px;
    color:var(--ink-2);
    padding:5px 0;
  }
  .footer-link:hover{color:var(--brand);}
  .footer-bottom{
    border-top:1px solid var(--line);
    padding:18px 0 24px;
    display:flex;
    flex-wrap:wrap;
    gap:8px 24px;
    justify-content:space-between;
    font-size:13px;
    color:var(--ink-3);
  }

  /* ---------- 移动端底部条 ---------- */
  .mobile-bar{
    position:fixed;
    left:0;right:0;bottom:0;
    z-index:70;
    background:rgba(255,255,255,.96);
    -webkit-backdrop-filter:blur(8px);
    backdrop-filter:blur(8px);
    border-top:1px solid var(--line);
    padding:8px 16px calc(8px + env(safe-area-inset-bottom));
    display:flex;
    align-items:center;
    gap:14px;
  }
  .mobile-bar .btn{flex:1 1 auto;}
  .mobile-bar a.text-link{font-size:13.5px;color:var(--ink-2);flex:0 0 auto;}
  .mobile-bar a.text-link:hover{color:var(--brand);}
  @media (min-width:1024px){ .mobile-bar{display:none;} }
  @media (max-width:1023px){ body{padding-bottom:76px;} }

  :focus-visible{outline:none;box-shadow:0 0 0 3px rgba(27,107,168,.28);border-radius:6px;}

/* roulang page: category3 */
:root{
    --bg:#F6F8FB;
    --surface:#FFFFFF;
    --ink:#10202E;
    --ink-2:#4A6076;
    --ink-3:#8A9AAB;
    --brand:#1B6BA8;
    --brand-dark:#14507F;
    --brand-soft:#E7F1F8;
    --accent:#E0821F;
    --accent-soft:#FDF2E3;
    --line:#E3E9F0;
    --radius-card:14px;
    --radius-btn:10px;
    --radius-chip:999px;
    --shadow-1:0 1px 2px rgba(16,32,46,.04), 0 8px 24px -12px rgba(16,32,46,.12);
    --shadow-2:0 2px 6px rgba(16,32,46,.06), 0 16px 36px -16px rgba(16,32,46,.18);
    --header-h:72px;
  }

  *,*::before,*::after{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
    font-size:16px;
    line-height:1.8;
    -webkit-font-smoothing:antialiased;
    text-align:left;
  }
  img{max-width:100%;display:block;border:0;}
  a{color:var(--brand);text-decoration:none;transition:color .18s ease-out;}
  a:hover{color:var(--brand-dark);}
  button,input,textarea{font-family:inherit;font-size:inherit;}
  ul{margin:0;padding:0;list-style:none;}
  h1,h2,h3,h4,p{margin:0;}
  .num{font-variant-numeric:tabular-nums;}

  .container{
    width:100%;
    max-width:1200px;
    margin:0 auto;
    padding-left:20px;
    padding-right:20px;
  }
  @media (min-width:768px){ .container{padding-left:24px;padding-right:24px;} }
  @media (min-width:1280px){ .container{padding-left:32px;padding-right:32px;} }

  /* ============ 头部导航 ============ */
  .site-header{
    position:sticky;
    top:0;
    z-index:60;
    background:rgba(255,255,255,.92);
    -webkit-backdrop-filter:blur(8px);
    backdrop-filter:blur(8px);
    border-bottom:1px solid transparent;
    transition:border-color .2s ease-out;
  }
  .site-header.is-scrolled{border-bottom-color:var(--line);}
  .nav-inner{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:24px;
    height:var(--header-h);
  }
  .logo{display:flex;align-items:center;gap:10px;flex-shrink:0;}
  .logo-mark{
    width:12px;height:12px;border-radius:3px;
    background:linear-gradient(135deg,#1B6BA8,#4FA0D8);
    box-shadow:0 0 0 4px rgba(27,107,168,.10);
    display:inline-block;
  }
  .logo-text{
    display:block;
    font-size:19px;
    font-weight:700;
    color:var(--ink);
    letter-spacing:-.01em;
    line-height:1.15;
  }
  .logo-sub{
    display:block;
    font-size:10px;
    letter-spacing:.18em;
    color:var(--ink-3);
    line-height:1.2;
  }
  .nav-chips{
    display:flex;
    align-items:center;
    gap:6px;
    overflow-x:auto;
    scrollbar-width:none;
    -ms-overflow-style:none;
  }
  .nav-chips::-webkit-scrollbar{display:none;}
  .nav-chip{
    display:inline-block;
    padding:8px 16px;
    border-radius:var(--radius-chip);
    font-size:14px;
    color:var(--ink-2);
    white-space:nowrap;
    line-height:1.4;
    transition:background-color .18s ease-out,color .18s ease-out;
  }
  .nav-chip:hover{background:rgba(231,241,248,.6);color:var(--brand);}
  .nav-chip.is-active{background:var(--brand-soft);color:var(--brand);font-weight:600;}
  .nav-cta{flex-shrink:0;}

  /* ============ 按钮 ============ */
  .btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    height:46px;
    padding:0 22px;
    border-radius:var(--radius-btn);
    font-size:15px;
    font-weight:600;
    line-height:1;
    border:1px solid transparent;
    cursor:pointer;
    transition:background-color .18s ease-out,color .18s ease-out,border-color .18s ease-out,transform .18s ease-out,box-shadow .18s ease-out;
  }
  .btn:focus-visible,.nav-chip:focus-visible,.anchor-chip:focus-visible,input:focus-visible,textarea:focus-visible{
    outline:none;
    box-shadow:0 0 0 3px rgba(27,107,168,.28);
  }
  .btn-primary{background:var(--brand);color:#fff;box-shadow:var(--shadow-1);}
  .btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-2);}
  .btn-primary:active{transform:translateY(0);}
  .btn-secondary{background:#fff;color:var(--brand);border-color:var(--brand);}
  .btn-secondary:hover{background:var(--brand-soft);color:var(--brand-dark);}
  .btn-ghost{background:transparent;color:var(--brand);border-radius:6px;padding:0 8px;height:40px;}
  .btn-ghost:hover{color:var(--brand-dark);border-bottom:1px solid var(--brand-dark);border-radius:6px 6px 0 0;}
  .btn-sm{height:38px;padding:0 16px;font-size:14px;}

  /* ============ 徽章 / 标签 ============ */
  .badge{
    display:inline-block;
    padding:4px 10px;
    border-radius:4px;
    background:var(--brand-soft);
    color:var(--brand);
    font-size:12px;
    font-weight:600;
    letter-spacing:.02em;
  }
  .chip{
    display:inline-block;
    padding:7px 15px;
    border-radius:var(--radius-chip);
    background:#fff;
    border:1px solid var(--line);
    color:var(--ink-2);
    font-size:13px;
    transition:background-color .18s ease-out,color .18s ease-out,border-color .18s ease-out;
  }
  .chip:hover{background:var(--brand-soft);color:var(--brand);border-color:#CFE2EF;}
  .chip.is-on{background:var(--brand-soft);color:var(--brand);border-color:#CFE2EF;font-weight:600;}

  /* ============ Hero ============ */
  .hero{padding-top:24px;}
  .hero-band{
    position:relative;
    overflow:hidden;
    border-radius:18px;
    background-color:#0F2334;
    background-image:
      linear-gradient(105deg,rgba(12,32,48,.92) 0%,rgba(16,44,66,.78) 46%,rgba(20,60,90,.55) 100%),
      url('/assets/images/backpic/back-2.png');
    background-size:cover;
    background-position:center;
    padding:44px 0 40px;
  }
  .hero-band::after{
    content:"";
    position:absolute;
    right:-60px;
    top:-80px;
    width:360px;
    height:360px;
    border-radius:50%;
    background:radial-gradient(circle,rgba(255,255,255,.10),rgba(255,255,255,0) 70%);
    pointer-events:none;
  }
  .hero-grid{
    position:relative;
    display:grid;
    grid-template-columns:1fr;
    gap:28px;
    align-items:center;
  }
  @media (min-width:1024px){
    .hero-grid{grid-template-columns:7fr 5fr;gap:40px;}
  }
  .hero-copy{color:#fff;}
  .hero-badge{
    display:inline-block;
    padding:5px 12px;
    border-radius:999px;
    background:rgba(255,255,255,.14);
    border:1px solid rgba(255,255,255,.24);
    color:#DCEBF7;
    font-size:12px;
    letter-spacing:.04em;
  }
  h1{
    margin:16px 0 0;
    font-size:clamp(28px,4.2vw,44px);
    font-weight:700;
    line-height:1.25;
    letter-spacing:-.01em;
    color:#fff;
  }
  .hero-sub{
    margin-top:14px;
    max-width:640px;
    font-size:16px;
    line-height:1.85;
    color:rgba(233,242,249,.86);
  }
  .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px;}
  .hero-actions .btn-primary{background:#fff;color:var(--brand);}
  .hero-actions .btn-primary:hover{background:#EAF3FA;color:var(--brand-dark);}
  .hero-actions .btn-secondary{background:transparent;color:#fff;border-color:rgba(255,255,255,.55);}
  .hero-actions .btn-secondary:hover{background:rgba(255,255,255,.12);color:#fff;}
  .hero-facts{
    display:flex;
    flex-wrap:wrap;
    gap:0 18px;
    margin-top:26px;
    font-size:13px;
    color:rgba(214,231,243,.8);
  }
  .hero-facts span{
    padding-right:18px;
    border-right:1px solid rgba(255,255,255,.22);
  }
  .hero-facts span:last-child{border-right:0;padding-right:0;}
  .hero-media{
    background:var(--surface);
    border-radius:var(--radius-card);
    padding:12px;
    box-shadow:var(--shadow-2);
  }
  .hero-media img{
    width:100%;
    height:210px;
    object-fit:cover;
    border-radius:10px;
    background:var(--bg);
  }
  @media (min-width:1024px){ .hero-media img{height:236px;} }

  /* ============ 锚点导航 ============ */
  .anchor-nav{
    position:sticky;
    top:var(--header-h);
    z-index:40;
    background:rgba(246,248,251,.94);
    -webkit-backdrop-filter:blur(6px);
    backdrop-filter:blur(6px);
    border-bottom:1px solid var(--line);
  }
  .anchor-inner{
    display:flex;
    align-items:center;
    gap:8px;
    overflow-x:auto;
    padding-top:12px;
    padding-bottom:12px;
    scrollbar-width:none;
    -ms-overflow-style:none;
  }
  .anchor-inner::-webkit-scrollbar{display:none;}
  .anchor-chip{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:8px 16px;
    border-radius:var(--radius-chip);
    background:#fff;
    border:1px solid var(--line);
    font-size:13.5px;
    color:var(--ink-2);
    white-space:nowrap;
    transition:background-color .18s ease-out,color .18s ease-out,border-color .18s ease-out;
  }
  .anchor-chip:hover{background:var(--brand-soft);color:var(--brand);border-color:#CFE2EF;}
  .anchor-chip.is-active{background:var(--brand-soft);color:var(--brand);border-color:#CFE2EF;font-weight:600;}
  .anchor-chip i{
    font-style:normal;
    font-size:11px;
    font-weight:700;
    color:var(--accent);
  }

  /* ============ 通用板块 ============ */
  .section{padding-top:56px;}
  @media (min-width:768px){ .section{padding-top:72px;} }
  @media (min-width:1024px){ .section{padding-top:88px;} }
  .section-head{max-width:760px;margin-bottom:28px;}
  .section-head h2{
    font-size:clamp(22px,2.6vw,30px);
    font-weight:600;
    line-height:1.35;
    letter-spacing:-.01em;
    color:var(--ink);
  }
  .section-head p{margin-top:12px;color:var(--ink-2);font-size:15.5px;max-width:720px;}
  .eyebrow{
    display:inline-flex;
    align-items:center;
    gap:8px;
    font-size:13px;
    color:var(--ink-3);
    letter-spacing:.06em;
    margin-bottom:10px;
  }
  .eyebrow::before{
    content:"";
    width:18px;
    height:1px;
    background:var(--brand);
    display:inline-block;
  }

  /* ============ 分组信息列表 ============ */
  .group-block{
    padding:36px 0;
    border-top:1px solid var(--line);
    scroll-margin-top:150px;
  }
  .group-block:first-of-type{border-top:0;}
  .group-head{
    display:flex;
    gap:16px;
    align-items:flex-start;
    margin-bottom:24px;
  }
  .num-badge{
    flex-shrink:0;
    width:36px;
    height:36px;
    border-radius:8px;
    background:var(--accent-soft);
    color:var(--accent);
    font-size:14px;
    font-weight:700;
    display:flex;
    align-items:center;
    justify-content:center;
    font-variant-numeric:tabular-nums;
  }
  .group-head h2{
    font-size:clamp(20px,2.3vw,26px);
    font-weight:600;
    line-height:1.4;
    color:var(--ink);
  }
  .group-head p{margin-top:8px;font-size:14.5px;color:var(--ink-2);max-width:720px;}
  .group-list{
    display:grid;
    grid-template-columns:1fr;
    gap:0;
    border-top:1px solid var(--line);
  }
  @media (min-width:768px){
    .group-list{grid-template-columns:1fr 1fr;column-gap:48px;}
  }
  .info-item{
    position:relative;
    padding:18px 0 18px 20px;
    border-bottom:1px solid var(--line);
  }
  .info-item::before{
    content:"";
    position:absolute;
    left:0;
    top:24px;
    width:8px;
    height:8px;
    border-radius:2px;
    background:var(--brand-soft);
    border:1px solid #CBE0EF;
  }
  .info-item h3{
    font-size:16.5px;
    font-weight:600;
    line-height:1.5;
    color:var(--ink);
  }
  .info-item p{
    margin-top:7px;
    font-size:14.5px;
    line-height:1.8;
    color:var(--ink-2);
    max-width:640px;
  }
  .info-item:hover::before{background:var(--brand);border-color:var(--brand);}

  /* ============ 深色规格区 ============ */
  .spec-band{
    margin-top:56px;
    background:#0F2334;
    border-radius:18px;
    padding:38px 0;
    position:relative;
    overflow:hidden;
  }
  .spec-band::before{
    content:"";
    position:absolute;
    left:-80px;
    bottom:-120px;
    width:320px;
    height:320px;
    border-radius:50%;
    background:radial-gradient(circle,rgba(27,107,168,.45),rgba(27,107,168,0) 70%);
  }
  .spec-inner{position:relative;}
  .spec-head{display:flex;flex-wrap:wrap;gap:12px;align-items:baseline;justify-content:space-between;margin-bottom:26px;}
  .spec-head h2{font-size:clamp(20px,2.4vw,26px);font-weight:600;color:#fff;}
  .spec-head span{font-size:13px;color:rgba(206,226,240,.72);}
  .spec-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:1px;
    background:rgba(255,255,255,.10);
    border-radius:12px;
    overflow:hidden;
  }
  @media (min-width:640px){ .spec-grid{grid-template-columns:1fr 1fr;} }
  @media (min-width:1024px){ .spec-grid{grid-template-columns:repeat(4,1fr);} }
  .spec-cell{
    background:#12293C;
    padding:22px 20px;
    transition:background-color .18s ease-out;
  }
  .spec-cell:hover{background:#173category;}
  .spec-cell:hover{background:#173349;}
  .spec-cell .k{
    font-size:12px;
    letter-spacing:.08em;
    color:rgba(160,190,214,.85);
  }
  .spec-cell .v{
    margin-top:10px;
    font-size:19px;
    font-weight:700;
    color:#fff;
    font-variant-numeric:tabular-nums;
    letter-spacing:-.01em;
  }
  .spec-cell .d{
    margin-top:8px;
    font-size:13.5px;
    line-height:1.75;
    color:rgba(206,226,240,.72);
  }

  /* ============ 设备频道卡 ============ */
  .channel-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:20px;
  }
  @media (min-width:640px){ .channel-grid{grid-template-columns:1fr 1fr;} }
  @media (min-width:1024px){ .channel-grid{grid-template-columns:repeat(4,1fr);} }
  .card{
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);
    padding:20px;
    transition:transform .18s ease-out,box-shadow .18s ease-out,border-color .18s ease-out;
  }
  .card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);border-color:#D6E3EE;}
  .channel-card{padding:14px;}
  .channel-card img{
    width:100%;
    aspect-ratio:16/10;
    object-fit:cover;
    border-radius:10px;
    background:var(--bg);
  }
  .channel-card h3{margin-top:14px;font-size:16px;font-weight:600;color:var(--ink);}
  .channel-card p{margin-top:6px;font-size:13.5px;line-height:1.75;color:var(--ink-2);}
  .channel-meta{
    margin-top:14px;
    padding-top:12px;
    border-top:1px solid var(--line);
    display:flex;
    align-items:center;
    justify-content:space-between;
    font-size:12.5px;
    color:var(--ink-3);
  }

  /* ============ 数据指标 ============ */
  .stat-row{
    display:grid;
    grid-template-columns:1fr;
    gap:1px;
    background:var(--line);
    border:1px solid var(--line);
    border-radius:var(--radius-card);
    overflow:hidden;
  }
  @media (min-width:640px){ .stat-row{grid-template-columns:1fr 1fr;} }
  @media (min-width:1024px){ .stat-row{grid-template-columns:repeat(4,1fr);} }
  .stat-cell{
    background:var(--surface);
    padding:26px 22px;
  }
  .stat-cell .n{
    font-size:32px;
    font-weight:700;
    color:var(--brand);
    line-height:1.2;
    font-variant-numeric:tabular-nums;
    letter-spacing:-.02em;
  }
  .stat-cell .t{margin-top:8px;font-size:13.5px;color:var(--ink-3);line-height:1.7;}

  /* ============ 行动区 ============ */
  .cta-band{
    margin-top:56px;
    background:var(--brand-soft);
    border-radius:18px;
    padding:32px 24px;
  }
  @media (min-width:768px){ .cta-band{padding:40px 40px;} }
  .cta-inner{
    display:grid;
    grid-template-columns:1fr;
    gap:20px;
    align-items:center;
  }
  @media (min-width:1024px){ .cta-inner{grid-template-columns:8fr 4fr;gap:32px;} }
  .cta-box{
    background:#fff;
    border-radius:var(--radius-card);
    padding:26px 24px;
    box-shadow:var(--shadow-1);
  }
  .cta-box h2{font-size:clamp(20px,2.3vw,26px);font-weight:600;color:var(--ink);line-height:1.4;}
  .cta-box p{margin-top:10px;font-size:15px;color:var(--ink-2);max-width:640px;}
  .cta-actions{display:flex;flex-wrap:wrap;gap:12px;}

  /* ============ FAQ ============ */
  .faq-wrap{max-width:860px;margin:0 auto;}
  .faq-item{
    border-bottom:1px solid var(--line);
    border-left:4px solid transparent;
    padding-left:0;
    transition:border-color .18s ease-out,background-color .18s ease-out;
  }
  .faq-item[open]{border-left-color:var(--brand);background:#FBFDFF;}
  .faq-item summary{
    list-style:none;
    cursor:pointer;
    padding:20px 44px 20px 20px;
    position:relative;
    font-size:16.5px;
    font-weight:600;
    color:var(--ink);
    line-height:1.6;
  }
  .faq-item summary::-webkit-details-marker{display:none;}
  .faq-item summary::after{
    content:"+";
    position:absolute;
    right:18px;
    top:50%;
    transform:translateY(-50%);
    font-size:22px;
    font-weight:400;
    color:var(--brand);
    line-height:1;
    transition:transform .2s ease-out;
  }
  .faq-item[open] summary::after{transform:translateY(-50%) rotate(45deg);}
  .faq-item .faq-body{
    padding:0 44px 22px 20px;
    font-size:15px;
    line-height:1.85;
    color:var(--ink-2);
    max-width:760px;
  }

  /* ============ 表单 ============ */
  .form-panel{
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-card);
    box-shadow:var(--shadow-1);
    padding:24px 20px;
  }
  @media (min-width:768px){ .form-panel{padding:30px 28px;} }
  .form-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:16px;
  }
  @media (min-width:768px){ .form-grid{grid-template-columns:3fr 3fr 6fr;} }
  .field label{display:block;font-size:14px;color:var(--ink-2);margin-bottom:7px;}
  .field input,.field textarea{
    width:100%;
    height:44px;
    padding:0 14px;
    border:1px solid var(--line);
    border-radius:10px;
    background:#fff;
    color:var(--ink);
    transition:border-color .18s ease-out,box-shadow .18s ease-out;
  }
  .field textarea{height:96px;padding:11px 14px;resize:vertical;line-height:1.7;}
  .field input::placeholder,.field textarea::placeholder{color:#A9B7C4;}
  .field input:focus,.field textarea:focus{
    outline:none;
    border-color:var(--brand);
    box-shadow:0 0 0 3px rgba(27,107,168,.22);
  }
  .form-foot{
    margin-top:18px;
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    justify-content:space-between;
    gap:12px;
  }
  .form-tip{font-size:13px;color:var(--ink-3);}
  .form-msg{
    margin-top:14px;
    font-size:14px;
    color:var(--brand-dark);
    background:var(--brand-soft);
    border-radius:10px;
    padding:10px 14px;
    display:none;
  }
  .form-msg.is-on{display:block;}

  /* ============ 页脚 ============ */
  .site-footer{
    margin-top:72px;
    background:#EDF2F7;
    border-top:1px solid var(--line);
    padding:52px 0 22px;
  }
  .footer-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:32px;
  }
  @media (min-width:768px){ .footer-grid{grid-template-columns:1fr 1fr;} }
  @media (min-width:1024px){ .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;} }
  .footer-title{
    font-size:14px;
    font-weight:600;
    color:var(--ink);
    margin-bottom:14px;
    letter-spacing:.01em;
  }
  .footer-link{
    display:block;
    font-size:14px;
    color:var(--ink-2);
    padding:5px 0;
    line-height:1.7;
  }
  a.footer-link:hover{color:var(--brand);}
  .footer-bottom{
    margin-top:38px;
    padding-top:18px;
    border-top:1px solid var(--line);
    display:flex;
    flex-wrap:wrap;
    justify-content:space-between;
    gap:10px;
    font-size:13px;
    color:var(--ink-3);
  }

  /* ============ 移动底部条 ============ */
  .mobile-bar{
    position:fixed;
    left:0;right:0;bottom:0;
    z-index:70;
    display:none;
    align-items:center;
    gap:12px;
    padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px));
    background:rgba(255,255,255,.96);
    -webkit-backdrop-filter:blur(8px);
    backdrop-filter:blur(8px);
    border-top:1px solid var(--line);
  }
  .mobile-bar .btn{flex:1;}
  @media (max-width:767px){
    .mobile-bar{display:flex;}
    body{padding-bottom:74px;}
    :root{--header-h:64px;}
    .logo-text{font-size:17px;}
    .nav-cta .btn{height:34px;padding:0 12px;font-size:13px;}
    .nav-chips{
      -webkit-mask-image:linear-gradient(to right,transparent 0,#000 12px,#000 calc(100% - 16px),transparent 100%);
      mask-image:linear-gradient(to right,transparent 0,#000 12px,#000 calc(100% - 16px),transparent 100%);
    }
  }
  @media (max-width:520px){
    .hero-band{padding:34px 0 30px;}
    .hero-facts{gap:0 12px;font-size:12.5px;}
    .hero-facts span{padding-right:12px;}
    .spec-band{padding:30px 0;}
  }