/* roulang page: index */
:root{
      --primary:#0f766e;
      --primary-deep:#0b5f59;
      --primary-soft:#e8f5f3;
      --primary-softer:#f1fbf9;
      --accent:#f59e0b;
      --accent-soft:#fff4dd;
      --text:#172033;
      --muted:#667085;
      --light:#8a97a8;
      --bg:#f7faf9;
      --card:#ffffff;
      --line:#e5ecea;
      --line-strong:#d4e4e0;
      --footer:#0b2526;
      --shadow:0 18px 45px rgba(15,35,45,.08);
      --shadow-hover:0 24px 55px rgba(15,35,45,.13);
      --radius:22px;
      --radius-lg:30px;
      --radius-sm:14px;
      --container:1200px;
      --ease:all .22s ease;
      --font:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
    }
    *{box-sizing:border-box;margin:0;padding:0}
    html{scroll-behavior:smooth}
    body{
      font-family:var(--font);
      color:var(--text);
      background:
        radial-gradient(circle at 12% 8%, rgba(15,118,110,.10), transparent 30%),
        radial-gradient(circle at 86% 12%, rgba(245,158,11,.10), transparent 28%),
        var(--bg);
      line-height:1.7;
      overflow-x:hidden;
    }
    a{color:inherit;text-decoration:none;transition:var(--ease)}
    img{max-width:100%;display:block}
    button,input{font:inherit}
    button{border:0;cursor:pointer;background:none}
    a:focus-visible,button:focus-visible,input:focus-visible{
      outline:3px solid rgba(245,158,11,.45);
      outline-offset:3px;
      border-radius:12px;
    }
    .container{width:min(var(--container), calc(100% - 40px));margin:0 auto}
    .section{padding:86px 0}
    .section-tight{padding:64px 0}
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:7px 12px;
      border-radius:999px;
      background:rgba(15,118,110,.10);
      color:var(--primary-deep);
      font-size:14px;
      font-weight:700;
      letter-spacing:.01em;
    }
    .eyebrow::before{
      content:"";
      width:8px;height:8px;border-radius:50%;
      background:var(--accent);
      box-shadow:0 0 0 5px rgba(245,158,11,.15);
    }
    .section-head{
      display:flex;
      align-items:flex-end;
      justify-content:space-between;
      gap:28px;
      margin-bottom:34px;
    }
    .section-title{
      margin-top:14px;
      font-size:34px;
      line-height:1.22;
      letter-spacing:-.02em;
      font-weight:800;
    }
    .section-desc{
      color:var(--muted);
      font-size:16px;
      max-width:620px;
      margin-top:14px;
    }
    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:8px;
      min-height:48px;
      padding:0 22px;
      border-radius:999px;
      font-weight:800;
      border:1px solid transparent;
      transition:var(--ease);
      white-space:nowrap;
    }
    .btn-primary{
      color:#fff;
      background:linear-gradient(135deg,var(--primary),#087f8c);
      box-shadow:0 14px 28px rgba(15,118,110,.22);
    }
    .btn-primary:hover{transform:translateY(-2px);background:linear-gradient(135deg,var(--primary-deep),#087281);box-shadow:0 18px 34px rgba(15,118,110,.30)}
    .btn-secondary{
      color:var(--primary-deep);
      background:#fff;
      border-color:rgba(15,118,110,.18);
      box-shadow:0 10px 22px rgba(15,35,45,.05);
    }
    .btn-secondary:hover{transform:translateY(-2px);background:var(--primary-softer);border-color:rgba(15,118,110,.35)}
    .btn:active{transform:translateY(0)}
    .badge{
      display:inline-flex;
      align-items:center;
      gap:6px;
      padding:5px 10px;
      border-radius:999px;
      background:var(--primary-soft);
      color:var(--primary-deep);
      font-size:13px;
      font-weight:700;
    }
    .badge-amber{background:var(--accent-soft);color:#9a5b00}
    .site-header{
      position:sticky;
      top:0;
      z-index:50;
      background:rgba(247,250,249,.88);
      backdrop-filter:blur(18px);
      border-bottom:1px solid rgba(229,236,234,.76);
      transition:box-shadow .22s ease, background .22s ease;
    }
    .site-header.is-scrolled{
      box-shadow:0 12px 35px rgba(15,35,45,.08);
      background:rgba(255,255,255,.94);
    }
    .nav-wrap{
      min-height:70px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:22px;
    }
    .logo{
      display:inline-flex;
      align-items:center;
      gap:12px;
      font-weight:900;
      letter-spacing:-.02em;
      color:var(--text);
      flex:0 0 auto;
    }
    .logo-mark{
      width:42px;height:42px;border-radius:16px;
      display:grid;place-items:center;
      background:linear-gradient(135deg,var(--primary),#0b9a8e);
      box-shadow:0 12px 26px rgba(15,118,110,.22);
      position:relative;
      overflow:hidden;
    }
    .logo-mark::before{
      content:"";
      width:0;height:0;
      border-top:8px solid transparent;
      border-bottom:8px solid transparent;
      border-left:13px solid #fff;
      transform:translateX(2px);
      z-index:2;
    }
    .logo-mark::after{
      content:"";
      position:absolute;
      inset:8px;
      border:1px solid rgba(255,255,255,.35);
      border-radius:12px;
    }
    .logo-text{font-size:18px}
    .nav-links{
      display:flex;
      align-items:center;
      gap:6px;
      margin-left:auto;
    }
    .nav-links a{
      padding:10px 13px;
      border-radius:999px;
      color:#405063;
      font-weight:700;
      font-size:15px;
      position:relative;
    }
    .nav-links a:hover,.nav-links a.active{
      color:var(--primary-deep);
      background:rgba(15,118,110,.08);
    }
    .nav-cta{margin-left:8px}
    .menu-toggle{
      display:none;
      width:44px;height:44px;
      border-radius:14px;
      border:1px solid var(--line);
      background:#fff;
      align-items:center;
      justify-content:center;
      flex-direction:column;
      gap:5px;
      box-shadow:0 8px 18px rgba(15,35,45,.06);
    }
    .menu-toggle span{
      width:20px;height:2px;
      background:var(--text);
      border-radius:99px;
      transition:var(--ease);
    }
    .menu-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .menu-toggle.is-open span:nth-child(2){opacity:0}
    .menu-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
    .hero{
      position:relative;
      padding:86px 0 72px;
      overflow:hidden;
    }
    .hero::before{
      content:"";
      position:absolute;
      inset:0;
      background:
        linear-gradient(90deg, rgba(247,250,249,.96), rgba(247,250,249,.72)),
        url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity:.92;
      z-index:-2;
    }
    .hero::after{
      content:"";
      position:absolute;
      width:680px;height:680px;
      border-radius:50%;
      right:-240px;top:-260px;
      background:radial-gradient(circle, rgba(15,118,110,.18), transparent 64%);
      z-index:-1;
    }
    .hero-layout{
      display:grid;
      grid-template-columns:minmax(0,1.03fr) minmax(390px,.82fr);
      gap:52px;
      align-items:center;
    }
    .hero-kicker{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      align-items:center;
      margin-bottom:20px;
    }
    .hero h1{
      font-size:52px;
      line-height:1.13;
      letter-spacing:-.04em;
      font-weight:900;
      max-width:780px;
    }
    .hero h1 span{color:var(--primary-deep)}
    .hero-subtitle{
      max-width:720px;
      margin-top:22px;
      color:#4b5a6c;
      font-size:18px;
      line-height:1.9;
    }
    .hero-actions{
      display:flex;
      flex-wrap:wrap;
      gap:14px;
      margin-top:30px;
    }
    .trust-row{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:12px;
      margin-top:34px;
      max-width:720px;
    }
    .trust-item{
      background:rgba(255,255,255,.78);
      border:1px solid rgba(229,236,234,.86);
      border-radius:18px;
      padding:14px 15px;
      box-shadow:0 12px 28px rgba(15,35,45,.05);
    }
    .trust-item strong{
      display:block;
      font-size:15px;
      color:var(--text);
      margin-bottom:4px;
    }
    .trust-item span{
      display:block;
      color:var(--muted);
      font-size:13px;
      line-height:1.55;
    }
    .preview-stage{
      position:relative;
      min-height:500px;
      display:grid;
      place-items:center;
    }
    .preview-ring{
      position:absolute;
      width:450px;height:450px;
      border-radius:50%;
      border:1px dashed rgba(15,118,110,.26);
      animation:slowSpin 28s linear infinite;
    }
    @keyframes slowSpin{to{transform:rotate(360deg)}}
    .video-window{
      width:100%;
      max-width:470px;
      border-radius:30px;
      background:#fff;
      border:1px solid rgba(229,236,234,.9);
      box-shadow:0 28px 70px rgba(15,35,45,.16);
      overflow:hidden;
      position:relative;
      z-index:2;
    }
    .video-cover{
      height:236px;
      background:
        linear-gradient(180deg, rgba(10,38,39,.12), rgba(10,38,39,.64)),
        url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      position:relative;
      padding:18px;
      display:flex;
      align-items:flex-end;
      justify-content:space-between;
      color:#fff;
    }
    .play-button{
      position:absolute;
      left:50%;top:50%;
      width:74px;height:74px;
      border-radius:50%;
      transform:translate(-50%,-50%);
      display:grid;place-items:center;
      background:rgba(255,255,255,.88);
      box-shadow:0 18px 38px rgba(0,0,0,.22);
    }
    .play-button::before{
      content:"";
      width:0;height:0;
      border-top:13px solid transparent;
      border-bottom:13px solid transparent;
      border-left:20px solid var(--primary);
      transform:translateX(3px);
    }
    .cover-info strong{display:block;font-size:18px;margin-bottom:4px}
    .cover-info span{font-size:13px;color:rgba(255,255,255,.86)}
    .status-pill{
      align-self:flex-start;
      padding:7px 10px;
      border-radius:999px;
      background:rgba(255,255,255,.86);
      color:var(--primary-deep);
      font-size:12px;
      font-weight:800;
    }
    .video-body{padding:22px}
    .progress{
      height:8px;
      border-radius:999px;
      background:#edf2f1;
      overflow:hidden;
      margin-bottom:18px;
    }
    .progress span{
      display:block;
      width:68%;
      height:100%;
      border-radius:inherit;
      background:linear-gradient(90deg,var(--primary),var(--accent));
    }
    .preview-list{display:grid;gap:12px}
    .preview-line{
      display:flex;
      justify-content:space-between;
      align-items:center;
      gap:16px;
      padding:13px 14px;
      border:1px solid var(--line);
      border-radius:16px;
      background:#fbfdfc;
    }
    .preview-line b{font-size:14px}
    .preview-line small{color:var(--muted);font-weight:700}
    .floating-note{
      position:absolute;
      right:0;
      bottom:44px;
      z-index:3;
      background:#fff;
      border:1px solid var(--line);
      border-radius:20px;
      padding:14px 16px;
      box-shadow:var(--shadow);
      max-width:210px;
    }
    .floating-note strong{display:block;font-size:14px;margin-bottom:4px}
    .floating-note span{font-size:13px;color:var(--muted);line-height:1.55}
    .steps-wrap{
      display:grid;
      grid-template-columns:1fr 360px;
      gap:28px;
      align-items:stretch;
    }
    .steps{
      position:relative;
      display:grid;
      gap:18px;
    }
    .step-card{
      display:grid;
      grid-template-columns:58px 1fr;
      gap:18px;
      align-items:start;
      padding:24px;
      background:var(--card);
      border:1px solid var(--line);
      border-radius:var(--radius);
      box-shadow:0 12px 32px rgba(15,35,45,.05);
      transition:var(--ease);
    }
    .step-card:hover{
      transform:translateY(-3px);
      border-color:rgba(15,118,110,.32);
      box-shadow:var(--shadow-hover);
    }
    .step-icon{
      width:58px;height:58px;
      border-radius:20px;
      display:grid;place-items:center;
      color:#fff;
      font-weight:900;
      background:linear-gradient(135deg,var(--primary),#0e9f92);
      box-shadow:0 12px 26px rgba(15,118,110,.22);
    }
    .step-card:nth-child(2) .step-icon{background:linear-gradient(135deg,#087f8c,#22a3b3)}
    .step-card:nth-child(3) .step-icon{background:linear-gradient(135deg,var(--accent),#f8b84e)}
    .step-card h3{font-size:21px;margin-bottom:8px}
    .step-card p{color:var(--muted)}
    .guide-card{
      position:relative;
      overflow:hidden;
      padding:28px;
      border-radius:var(--radius-lg);
      background:
        linear-gradient(180deg, rgba(15,118,110,.92), rgba(10,76,72,.94)),
        url('/assets/images/coverpic/cover-2.webp') center/cover no-repeat;
      color:#fff;
      min-height:100%;
      box-shadow:var(--shadow);
    }
    .guide-card h3{font-size:26px;line-height:1.28;margin-top:18px}
    .guide-card p{color:rgba(255,255,255,.82);margin-top:12px}
    .guide-points{
      margin-top:26px;
      display:grid;
      gap:12px;
    }
    .guide-points li{
      list-style:none;
      padding:12px 13px;
      border-radius:16px;
      background:rgba(255,255,255,.12);
      border:1px solid rgba(255,255,255,.18);
      color:rgba(255,255,255,.92);
      font-weight:650;
    }
    .features{
      display:grid;
      grid-template-columns:.82fr 1.18fr;
      gap:34px;
      align-items:center;
    }
    .feature-visual{
      border-radius:var(--radius-lg);
      overflow:hidden;
      border:1px solid var(--line);
      box-shadow:var(--shadow);
      background:#fff;
    }
    .feature-visual img{
      width:100%;
      height:420px;
      object-fit:cover;
    }
    .feature-grid{
      display:grid;
      grid-template-columns:repeat(2,minmax(0,1fr));
      gap:18px;
    }
    .feature-card{
      background:#fff;
      border:1px solid var(--line);
      border-radius:var(--radius);
      padding:24px;
      box-shadow:0 10px 28px rgba(15,35,45,.05);
      transition:var(--ease);
    }
    .feature-card:hover{
      transform:translateY(-4px);
      border-color:rgba(15,118,110,.32);
      box-shadow:var(--shadow-hover);
    }
    .feature-card h3{font-size:20px;margin:14px 0 9px}
    .feature-card p{
      color:var(--muted);
      display:-webkit-box;
      -webkit-line-clamp:3;
      -webkit-box-orient:vertical;
      overflow:hidden;
    }
    .scene-layer{
      display:grid;
      gap:16px;
    }
    .scene-card{
      display:grid;
      grid-template-columns:180px 1fr auto;
      align-items:center;
      gap:24px;
      padding:22px;
      border-radius:24px;
      background:#fff;
      border:1px solid var(--line);
      box-shadow:0 10px 28px rgba(15,35,45,.045);
      transition:var(--ease);
    }
    .scene-card:hover{
      transform:translateX(4px);
      border-color:rgba(15,118,110,.32);
      box-shadow:var(--shadow-hover);
    }
    .scene-card:nth-child(even){margin-left:52px}
    .scene-index{
      display:flex;
      align-items:center;
      gap:10px;
      color:var(--primary-deep);
      font-weight:900;
    }
    .scene-index span{
      width:42px;height:42px;
      border-radius:16px;
      display:grid;place-items:center;
      background:var(--primary-soft);
    }
    .scene-card h3{font-size:21px;margin-bottom:6px}
    .scene-card p{color:var(--muted)}
    .text-link{
      color:var(--primary-deep);
      font-weight:800;
      display:inline-flex;
      align-items:center;
      gap:6px;
    }
    .text-link:hover{color:#084f4a;gap:10px}
    .updates-shell{
      display:grid;
      grid-template-columns:minmax(0,1fr) 360px;
      gap:26px;
      align-items:start;
    }
    .post-list{display:grid;gap:16px}
    .post-card{
      display:grid;
      grid-template-columns:96px 1fr;
      gap:18px;
      padding:22px;
      border-radius:24px;
      background:#fff;
      border:1px solid var(--line);
      box-shadow:0 10px 28px rgba(15,35,45,.045);
      transition:var(--ease);
    }
    .post-card:hover{
      transform:translateY(-3px);
      border-color:rgba(15,118,110,.33);
      box-shadow:var(--shadow-hover);
    }
    .post-date{
      min-height:86px;
      border-radius:18px;
      background:linear-gradient(180deg,var(--primary-soft),#fff);
      border:1px solid rgba(15,118,110,.12);
      display:flex;
      flex-direction:column;
      align-items:center;
      justify-content:center;
      color:var(--primary-deep);
      text-align:center;
      padding:10px;
      font-weight:900;
      line-height:1.25;
      word-break:break-word;
    }
    .post-date small{
      display:block;
      margin-top:5px;
      color:var(--muted);
      font-size:12px;
      font-weight:700;
    }
    .post-content h3{
      font-size:21px;
      line-height:1.35;
      margin:9px 0 8px;
      transition:var(--ease);
    }
    .post-card:hover h3{color:var(--primary-deep)}
    .post-content p{
      color:var(--muted);
      display:-webkit-box;
      -webkit-line-clamp:2;
      -webkit-box-orient:vertical;
      overflow:hidden;
      margin-bottom:12px;
    }
    .post-meta{
      display:flex;
      flex-wrap:wrap;
      align-items:center;
      gap:10px;
      color:var(--light);
      font-size:13px;
      font-weight:700;
    }
    .updates-aside{
      position:sticky;
      top:94px;
      display:grid;
      gap:18px;
    }
    .aside-card{
      padding:25px;
      border-radius:var(--radius);
      background:#fff;
      border:1px solid var(--line);
      box-shadow:var(--shadow);
    }
    .aside-card h3{font-size:22px;margin-bottom:10px}
    .aside-card p{color:var(--muted)}
    .aside-card .btn{margin-top:18px;width:100%}
    .notice-list{margin-top:18px;display:grid;gap:10px}
    .notice-list li{
      list-style:none;
      display:flex;
      gap:10px;
      color:#526173;
      font-size:14px;
    }
    .notice-list li::before{
      content:"";
      width:8px;height:8px;border-radius:50%;
      background:var(--accent);
      margin-top:9px;
      flex:0 0 auto;
    }
    .empty-state{
      padding:40px 24px;
      border:1px dashed rgba(15,118,110,.35);
      background:#fff;
      border-radius:24px;
      text-align:center;
      color:var(--muted);
      box-shadow:0 10px 28px rgba(15,35,45,.04);
    }
    .empty-icon{
      width:58px;height:58px;
      margin:0 auto 14px;
      border-radius:20px;
      display:grid;place-items:center;
      background:var(--primary-soft);
      color:var(--primary-deep);
      font-size:26px;
      font-weight:900;
    }
    .empty-state strong{display:block;color:var(--text);font-size:18px;margin-bottom:6px}
    .proof-band{
      padding:34px;
      border-radius:var(--radius-lg);
      background:linear-gradient(135deg,#ffffff,#edf8f6);
      border:1px solid var(--line);
      box-shadow:var(--shadow);
      display:grid;
      grid-template-columns:1fr 1fr 1fr;
      gap:18px;
    }
    .proof-item{
      padding:18px;
      border-radius:20px;
      background:rgba(255,255,255,.72);
      border:1px solid rgba(229,236,234,.8);
    }
    .proof-item strong{
      display:block;
      font-size:28px;
      color:var(--primary-deep);
      line-height:1.1;
      margin-bottom:8px;
    }
    .proof-item span{color:var(--muted)}
    .faq-wrap{
      display:grid;
      grid-template-columns:.75fr 1.25fr;
      gap:34px;
      align-items:start;
    }
    .faq-intro{
      padding:30px;
      border-radius:var(--radius-lg);
      background:
        linear-gradient(180deg, rgba(255,255,255,.80), rgba(255,255,255,.96)),
        url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      border:1px solid var(--line);
      box-shadow:var(--shadow);
    }
    .faq-intro h2{font-size:32px;line-height:1.25;margin-top:14px}
    .faq-intro p{color:var(--muted);margin-top:13px}
    .faq-list{display:grid;gap:14px}
    .faq-item{
      border-radius:20px;
      background:#fff;
      border:1px solid var(--line);
      box-shadow:0 8px 24px rgba(15,35,45,.04);
      overflow:hidden;
      transition:var(--ease);
    }
    .faq-item.is-open{
      background:var(--primary-softer);
      border-color:rgba(15,118,110,.28);
    }
    .faq-question{
      width:100%;
      min-height:60px;
      padding:18px 20px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:18px;
      color:var(--text);
      font-weight:800;
      text-align:left;
    }
    .faq-question .plus{
      width:30px;height:30px;
      border-radius:50%;
      display:grid;place-items:center;
      background:var(--primary-soft);
      color:var(--primary-deep);
      flex:0 0 auto;
      transition:var(--ease);
    }
    .faq-item.is-open .plus{transform:rotate(45deg);background:var(--primary);color:#fff}
    .faq-answer{
      max-height:0;
      overflow:hidden;
      transition:max-height .28s ease;
    }
    .faq-answer p{
      margin:0 20px 20px;
      padding-top:16px;
      border-top:1px solid rgba(15,118,110,.13);
      color:var(--muted);
    }
    .cta-panel{
      position:relative;
      overflow:hidden;
      border-radius:34px;
      padding:42px;
      background:
        radial-gradient(circle at 92% 20%, rgba(245,158,11,.24), transparent 25%),
        linear-gradient(135deg,#0f766e,#087f8c);
      color:#fff;
      box-shadow:0 26px 60px rgba(15,118,110,.24);
    }
    .cta-panel::after{
      content:"";
      position:absolute;
      width:260px;height:260px;
      border-radius:50%;
      left:-80px;bottom:-120px;
      background:rgba(255,255,255,.10);
    }
    .cta-content{
      position:relative;
      z-index:1;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:30px;
    }
    .cta-panel h2{
      font-size:34px;
      line-height:1.24;
      margin-bottom:12px;
    }
    .cta-panel p{
      color:rgba(255,255,255,.82);
      max-width:720px;
    }
    .cta-actions{
      display:flex;
      gap:12px;
      flex-wrap:wrap;
      justify-content:flex-end;
    }
    .cta-panel .btn-secondary{
      background:rgba(255,255,255,.96);
      border-color:rgba(255,255,255,.3);
    }
    .cta-panel .btn-primary{
      background:#fff;
      color:var(--primary-deep);
      box-shadow:0 16px 32px rgba(0,0,0,.14);
    }
    .site-footer{
      background:var(--footer);
      color:rgba(255,255,255,.80);
      margin-top:28px;
      padding:58px 0 28px;
    }
    .footer-grid{
      display:grid;
      grid-template-columns:1.1fr .9fr .9fr;
      gap:34px;
      align-items:start;
    }
    .footer-logo .logo{color:#fff}
    .footer-logo .logo-mark{box-shadow:none}
    .footer-logo p{
      margin-top:16px;
      max-width:440px;
      color:rgba(255,255,255,.66);
    }
    .footer-block h3{
      color:#fff;
      font-size:17px;
      margin-bottom:14px;
    }
    .footer-links{
      display:grid;
      gap:10px;
    }
    .footer-links a{
      color:rgba(255,255,255,.68);
      width:max-content;
    }
    .footer-links a:hover{color:#fff;transform:translateX(3px)}
    .footer-note{
      color:rgba(255,255,255,.66);
      font-size:14px;
    }
    .copyright{
      margin-top:38px;
      padding-top:22px;
      border-top:1px solid rgba(255,255,255,.12);
      display:flex;
      justify-content:space-between;
      gap:18px;
      flex-wrap:wrap;
      color:rgba(255,255,255,.58);
      font-size:14px;
    }
    @media (max-width:1100px){
      .hero-layout{grid-template-columns:1fr;gap:30px}
      .preview-stage{min-height:auto}
      .floating-note{right:20px}
      .features,.faq-wrap,.steps-wrap,.updates-shell{grid-template-columns:1fr}
      .updates-aside{position:static;grid-template-columns:repeat(2,minmax(0,1fr))}
      .feature-visual img{height:340px}
    }
    @media (max-width:900px){
      .nav-cta{display:none}
      .menu-toggle{display:flex}
      .nav-links{
        position:absolute;
        left:20px;right:20px;top:78px;
        display:none;
        flex-direction:column;
        align-items:stretch;
        gap:8px;
        padding:14px;
        background:#fff;
        border:1px solid var(--line);
        border-radius:22px;
        box-shadow:var(--shadow-hover);
      }
      .nav-links.is-open{display:flex}
      .nav-links a{padding:13px 15px}
      .hero{padding-top:58px}
      .hero h1{font-size:42px}
      .trust-row,.feature-grid,.proof-band,.updates-aside{grid-template-columns:1fr}
      .scene-card,.scene-card:nth-child(even){
        grid-template-columns:1fr;
        margin-left:0;
      }
      .scene-card .text-link{justify-self:start}
      .footer-grid{grid-template-columns:1fr 1fr}
      .footer-logo{grid-column:1/-1}
      .cta-content{flex-direction:column;align-items:flex-start}
      .cta-actions{justify-content:flex-start}
    }
    @media (max-width:640px){
      .container{width:min(100% - 32px, var(--container))}
      .section{padding:60px 0}
      .section-tight{padding:48px 0}
      .section-head{display:block}
      .section-title{font-size:28px}
      .hero h1{font-size:34px}
      .hero-subtitle{font-size:16px}
      .hero-actions .btn{width:100%}
      .trust-row{gap:10px}
      .preview-ring{display:none}
      .video-cover{height:210px}
      .floating-note{position:relative;right:auto;bottom:auto;margin-top:14px;max-width:none}
      .step-card{grid-template-columns:1fr;padding:20px}
      .post-card{grid-template-columns:1fr;padding:20px}
      .post-date{
        min-height:auto;
        align-items:flex-start;
        text-align:left;
      }
      .guide-card,.aside-card,.faq-intro{padding:22px}
      .cta-panel{padding:28px 22px;border-radius:26px}
      .cta-panel h2{font-size:27px}
      .cta-actions,.cta-actions .btn{width:100%}
      .footer-grid{grid-template-columns:1fr}
      .copyright{display:block}
      .copyright span{display:block;margin-top:8px}
    }
    @media (max-width:420px){
      .logo-text{font-size:16px}
      .logo-mark{width:38px;height:38px;border-radius:14px}
      .hero h1{font-size:31px}
      .feature-grid{grid-template-columns:1fr}
      .proof-item strong{font-size:24px}
    }

/* roulang page: article */
:root{
      --primary:#0f766e;
      --primary-deep:#0b5f59;
      --primary-soft:#e8f5f3;
      --primary-softer:#f1fbf9;
      --accent:#f59e0b;
      --accent-soft:#fff4dd;
      --text:#172033;
      --muted:#667085;
      --light:#8a97a8;
      --bg:#f7faf9;
      --card:#ffffff;
      --line:#e5ecea;
      --line-strong:#d4e4e0;
      --footer:#0b2526;
      --shadow:0 18px 45px rgba(15,35,45,.08);
      --shadow-hover:0 24px 55px rgba(15,35,45,.13);
      --radius:22px;
      --radius-lg:30px;
      --radius-sm:14px;
      --container:1200px;
      --ease:all .22s ease;
      --font:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:var(--font);
      color:var(--text);
      background:
        radial-gradient(circle at 10% 8%, rgba(15,118,110,.10), transparent 30%),
        radial-gradient(circle at 92% 12%, rgba(245,158,11,.10), transparent 30%),
        var(--bg);
      line-height:1.7;
      overflow-x:hidden;
      -webkit-font-smoothing:antialiased;
      text-rendering:optimizeLegibility;
    }
    a{color:inherit;text-decoration:none;transition:var(--ease)}
    img{max-width:100%;display:block}
    button,input{font:inherit}
    button{border:0;cursor:pointer;background:none}
    a:focus-visible,button:focus-visible,input:focus-visible{
      outline:3px solid rgba(245,158,11,.45);
      outline-offset:3px;
      border-radius:12px;
    }
    .container{width:min(var(--container), calc(100% - 40px));margin:0 auto}
    .section{padding:76px 0}
    .section-tight{padding:56px 0}
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:7px 12px;
      border-radius:999px;
      background:rgba(15,118,110,.10);
      color:var(--primary-deep);
      font-size:14px;
      font-weight:700;
      letter-spacing:.01em;
    }
    .eyebrow::before{
      content:"";
      width:8px;height:8px;border-radius:50%;
      background:var(--accent);
      box-shadow:0 0 0 5px rgba(245,158,11,.15);
      flex:0 0 auto;
    }
    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:8px;
      min-height:48px;
      padding:0 22px;
      border-radius:999px;
      font-weight:800;
      border:1px solid transparent;
      transition:var(--ease);
      white-space:nowrap;
      text-decoration:none;
    }
    .btn-primary{
      color:#fff;
      background:linear-gradient(135deg,var(--primary),#087f8c);
      box-shadow:0 14px 28px rgba(15,118,110,.22);
    }
    .btn-primary:hover{
      transform:translateY(-2px);
      color:#fff;
      background:linear-gradient(135deg,var(--primary-deep),#087281);
      box-shadow:0 18px 34px rgba(15,118,110,.30);
    }
    .btn-secondary{
      color:var(--primary-deep);
      background:#fff;
      border-color:rgba(15,118,110,.18);
      box-shadow:0 10px 22px rgba(15,35,45,.05);
    }
    .btn-secondary:hover{
      transform:translateY(-2px);
      color:var(--primary-deep);
      background:var(--primary-softer);
      border-color:rgba(15,118,110,.35);
    }
    .btn:active{transform:translateY(0)}
    .badge{
      display:inline-flex;
      align-items:center;
      gap:6px;
      padding:5px 10px;
      border-radius:999px;
      background:var(--primary-soft);
      color:var(--primary-deep);
      font-size:13px;
      font-weight:700;
      line-height:1.35;
      white-space:normal;
    }
    .badge-amber{background:var(--accent-soft);color:#9a5b00}
    .site-header{
      position:sticky;
      top:0;
      z-index:50;
      background:rgba(247,250,249,.88);
      backdrop-filter:blur(18px);
      border-bottom:1px solid rgba(229,236,234,.76);
      transition:box-shadow .22s ease, background .22s ease;
    }
    .site-header.is-scrolled{
      box-shadow:0 12px 35px rgba(15,35,45,.08);
      background:rgba(255,255,255,.94);
    }
    .nav-wrap{
      min-height:70px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:22px;
      position:relative;
    }
    .logo{
      display:inline-flex;
      align-items:center;
      gap:12px;
      font-weight:900;
      letter-spacing:-.02em;
      color:var(--text);
      flex:0 0 auto;
    }
    .logo:hover{color:var(--primary-deep)}
    .logo-mark{
      width:42px;height:42px;border-radius:16px;
      display:grid;place-items:center;
      background:linear-gradient(135deg,var(--primary),#0b9a8e);
      box-shadow:0 12px 26px rgba(15,118,110,.22);
      position:relative;
      overflow:hidden;
    }
    .logo-mark::before{
      content:"";
      width:0;height:0;
      border-top:8px solid transparent;
      border-bottom:8px solid transparent;
      border-left:13px solid #fff;
      transform:translateX(2px);
      z-index:2;
    }
    .logo-mark::after{
      content:"";
      position:absolute;
      inset:8px;
      border:1px solid rgba(255,255,255,.35);
      border-radius:12px;
    }
    .logo-text{font-size:18px}
    .nav-links{
      display:flex;
      align-items:center;
      gap:6px;
      margin-left:auto;
    }
    .nav-links a{
      padding:10px 13px;
      border-radius:999px;
      color:#405063;
      font-weight:700;
      font-size:15px;
      position:relative;
    }
    .nav-links a:hover,.nav-links a.active{
      color:var(--primary-deep);
      background:rgba(15,118,110,.08);
    }
    .nav-cta{margin-left:8px}
    .menu-toggle{
      display:none;
      width:44px;height:44px;
      border-radius:14px;
      border:1px solid var(--line);
      background:#fff;
      align-items:center;
      justify-content:center;
      flex-direction:column;
      gap:5px;
      box-shadow:0 8px 18px rgba(15,35,45,.06);
      transition:var(--ease);
    }
    .menu-toggle:hover{border-color:rgba(15,118,110,.28);transform:translateY(-1px)}
    .menu-toggle span{
      width:20px;height:2px;
      background:var(--text);
      border-radius:99px;
      transition:var(--ease);
    }
    .menu-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .menu-toggle.is-open span:nth-child(2){opacity:0}
    .menu-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

    .article-hero{
      position:relative;
      padding:54px 0 34px;
      overflow:hidden;
    }
    .article-hero::before{
      content:"";
      position:absolute;
      inset:0;
      background:
        linear-gradient(90deg, rgba(247,250,249,.96) 0%, rgba(247,250,249,.88) 50%, rgba(247,250,249,.70) 100%),
        url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      opacity:.92;
      z-index:-2;
    }
    .article-hero::after{
      content:"";
      position:absolute;
      width:360px;height:360px;
      border-radius:50%;
      right:-120px;top:-150px;
      background:radial-gradient(circle, rgba(15,118,110,.16), transparent 64%);
      z-index:-1;
    }
    .breadcrumb{
      display:flex;
      align-items:center;
      flex-wrap:wrap;
      gap:8px;
      margin:0 0 24px;
      font-size:14px;
      color:var(--muted);
    }
    .breadcrumb a{
      color:#4b5f6d;
      font-weight:700;
      padding:4px 0;
    }
    .breadcrumb a:hover{color:var(--primary-deep)}
    .breadcrumb .sep{color:#9aa6b2}
    .breadcrumb .current{
      color:var(--light);
      max-width:520px;
      overflow:hidden;
      text-overflow:ellipsis;
      white-space:nowrap;
    }
    .article-head{
      max-width:900px;
      padding:0 0 12px;
    }
    .article-kicker{
      display:flex;
      align-items:center;
      flex-wrap:wrap;
      gap:10px;
      margin-bottom:18px;
    }
    .article-title{
      margin:0;
      font-size:44px;
      line-height:1.18;
      letter-spacing:-.035em;
      font-weight:900;
      color:var(--text);
    }
    .article-summary{
      max-width:820px;
      margin:20px 0 0;
      color:var(--muted);
      font-size:17px;
      line-height:1.85;
    }
    .article-meta{
      display:flex;
      align-items:center;
      flex-wrap:wrap;
      gap:12px;
      margin-top:24px;
      color:var(--muted);
      font-size:14px;
    }
    .meta-dot{
      width:5px;height:5px;border-radius:50%;
      background:#c0cbc8;
    }

    .article-shell{
      padding:42px 0 76px;
    }
    .article-layout{
      display:grid;
      grid-template-columns:minmax(0, 820px) minmax(260px, 1fr);
      gap:34px;
      align-items:start;
    }
    .article-card{
      background:rgba(255,255,255,.94);
      border:1px solid var(--line);
      border-radius:var(--radius-lg);
      box-shadow:var(--shadow);
      overflow:hidden;
    }
    .article-cover{
      margin:18px 18px 0;
      border-radius:24px;
      overflow:hidden;
      position:relative;
      background:linear-gradient(135deg, rgba(15,118,110,.12), rgba(245,158,11,.10));
    }
    .article-cover img{
      width:100%;
      aspect-ratio:16/7;
      object-fit:cover;
      filter:saturate(.95);
    }
    .article-cover::after{
      content:"";
      position:absolute;
      inset:0;
      background:linear-gradient(180deg, rgba(11,37,38,0) 45%, rgba(11,37,38,.30));
      pointer-events:none;
    }
    .article-content{
      padding:38px 42px 42px;
      color:#243247;
      font-size:17px;
      line-height:1.88;
      word-break:break-word;
    }
    .article-content h2{
      margin:40px 0 16px;
      padding-top:4px;
      font-size:28px;
      line-height:1.32;
      font-weight:900;
      color:var(--text);
      letter-spacing:-.02em;
    }
    .article-content h3{
      margin:30px 0 12px;
      font-size:22px;
      line-height:1.38;
      font-weight:850;
      color:var(--text);
    }
    .article-content h4{
      margin:24px 0 10px;
      font-size:19px;
      font-weight:800;
      color:var(--text);
    }
    .article-content p{margin:0 0 18px}
    .article-content a{
      color:var(--primary-deep);
      font-weight:800;
      border-bottom:1px solid rgba(15,118,110,.22);
    }
    .article-content a:hover{
      color:#074b47;
      border-bottom-color:rgba(15,118,110,.58);
      background:rgba(15,118,110,.06);
    }
    .article-content ul,.article-content ol{
      margin:18px 0 22px;
      padding-left:1.45em;
    }
    .article-content li{margin:8px 0;padding-left:4px}
    .article-content blockquote{
      margin:28px 0;
      padding:20px 22px;
      border-left:4px solid var(--primary);
      background:var(--primary-softer);
      color:#35515a;
      border-radius:0 18px 18px 0;
    }
    .article-content img{
      width:auto;
      max-width:100%;
      height:auto;
      margin:28px auto;
      border-radius:20px;
      box-shadow:0 16px 34px rgba(15,35,45,.10);
    }
    .article-content table{
      width:100%;
      margin:26px 0;
      border-collapse:collapse;
      display:block;
      overflow-x:auto;
      white-space:nowrap;
      border:1px solid var(--line);
      border-radius:16px;
      background:#fff;
    }
    .article-content th,.article-content td{
      padding:12px 14px;
      border-bottom:1px solid var(--line);
      text-align:left;
    }
    .article-content th{
      background:var(--primary-softer);
      color:var(--primary-deep);
      font-weight:850;
    }
    .article-content tr:last-child td{border-bottom:0}
    .article-content hr{
      margin:34px 0;
      border:0;
      border-top:1px solid var(--line);
    }
    .not-found{
      padding:44px;
      text-align:center;
      background:#fff;
      border:1px dashed var(--line-strong);
      border-radius:24px;
    }
    .not-found h2{
      margin:0 0 12px;
      font-size:28px;
      font-weight:900;
    }
    .not-found p{
      margin:0 auto 24px;
      max-width:520px;
      color:var(--muted);
    }

    .article-actions{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:16px;
      flex-wrap:wrap;
      padding:24px 28px;
      border-top:1px solid var(--line);
      background:linear-gradient(135deg, rgba(15,118,110,.05), rgba(245,158,11,.05));
    }
    .article-actions p{
      margin:0;
      color:var(--muted);
      font-size:15px;
    }
    .article-actions strong{
      display:block;
      color:var(--text);
      font-size:17px;
      margin-bottom:2px;
    }

    .side-stack{
      position:sticky;
      top:94px;
      display:grid;
      gap:18px;
    }
    .side-card{
      background:#fff;
      border:1px solid var(--line);
      border-radius:var(--radius);
      box-shadow:0 14px 34px rgba(15,35,45,.06);
      padding:22px;
    }
    .side-card:hover{
      border-color:rgba(15,118,110,.24);
      box-shadow:var(--shadow);
    }
    .side-card h2,.side-card h3{
      margin:0 0 14px;
      font-size:19px;
      line-height:1.35;
      font-weight:900;
      color:var(--text);
    }
    .side-card p{
      margin:0 0 16px;
      color:var(--muted);
      font-size:14px;
      line-height:1.75;
    }
    .toc-list{
      display:grid;
      gap:10px;
      margin:0;
      padding:0;
      list-style:none;
    }
    .toc-list a{
      display:flex;
      align-items:center;
      gap:10px;
      padding:10px 12px;
      border-radius:14px;
      color:#405063;
      background:#fbfdfc;
      border:1px solid transparent;
      font-size:14px;
      font-weight:700;
    }
    .toc-list a::before{
      content:"";
      width:6px;height:6px;border-radius:50%;
      background:var(--primary);
      opacity:.55;
      flex:0 0 auto;
    }
    .toc-list a:hover{
      color:var(--primary-deep);
      background:var(--primary-softer);
      border-color:rgba(15,118,110,.14);
    }
    .mini-list{
      display:grid;
      gap:12px;
      margin:0;
      padding:0;
      list-style:none;
    }
    .mini-item{
      display:block;
      padding:14px;
      border-radius:16px;
      border:1px solid var(--line);
      background:#fbfdfc;
      transition:var(--ease);
    }
    .mini-item:hover{
      transform:translateY(-2px);
      border-color:rgba(15,118,110,.28);
      box-shadow:0 12px 24px rgba(15,35,45,.07);
    }
    .mini-item span{
      display:inline-flex;
      margin-bottom:6px;
      color:var(--primary-deep);
      font-size:12px;
      font-weight:800;
    }
    .mini-item strong{
      display:block;
      color:var(--text);
      font-size:14px;
      line-height:1.55;
    }
    .side-cover{
      position:relative;
      overflow:hidden;
      border-radius:20px;
      min-height:184px;
      background:
        linear-gradient(180deg, rgba(11,37,38,.15), rgba(11,37,38,.72)),
        url('/assets/images/coverpic/cover-2.webp') center/cover no-repeat;
      padding:20px;
      display:flex;
      flex-direction:column;
      justify-content:flex-end;
      color:#fff;
    }
    .side-cover .badge{
      align-self:flex-start;
      background:rgba(255,255,255,.88);
      color:var(--primary-deep);
      margin-bottom:12px;
    }
    .side-cover h3{
      color:#fff;
      margin:0 0 8px;
      font-size:20px;
    }
    .side-cover p{
      color:rgba(255,255,255,.82);
      margin:0;
    }

    .related-section{
      padding:0 0 82px;
    }
    .section-head{
      display:flex;
      align-items:flex-end;
      justify-content:space-between;
      gap:28px;
      margin-bottom:28px;
    }
    .section-title{
      margin:12px 0 0;
      font-size:32px;
      line-height:1.24;
      letter-spacing:-.02em;
      font-weight:900;
    }
    .section-desc{
      color:var(--muted);
      font-size:16px;
      max-width:620px;
      margin:12px 0 0;
    }
    .related-grid{
      display:grid;
      grid-template-columns:repeat(3, minmax(0,1fr));
      gap:18px;
    }
    .related-card{
      background:#fff;
      border:1px solid var(--line);
      border-radius:var(--radius);
      padding:22px;
      box-shadow:0 14px 34px rgba(15,35,45,.06);
      transition:var(--ease);
      min-height:190px;
      display:flex;
      flex-direction:column;
    }
    .related-card:hover{
      transform:translateY(-4px);
      border-color:rgba(15,118,110,.30);
      box-shadow:var(--shadow-hover);
    }
    .related-card h3{
      margin:14px 0 10px;
      font-size:20px;
      line-height:1.42;
      font-weight:900;
      color:var(--text);
    }
    .related-card:hover h3{color:var(--primary-deep)}
    .related-card p{
      margin:0;
      color:var(--muted);
      font-size:14px;
      line-height:1.72;
      display:-webkit-box;
      -webkit-line-clamp:3;
      -webkit-box-orient:vertical;
      overflow:hidden;
    }
    .related-meta{
      margin-top:auto;
      padding-top:18px;
      display:flex;
      justify-content:space-between;
      gap:12px;
      color:var(--light);
      font-size:13px;
      font-weight:700;
    }

    .cta-panel{
      position:relative;
      overflow:hidden;
      border-radius:var(--radius-lg);
      border:1px solid rgba(15,118,110,.14);
      background:
        linear-gradient(135deg, rgba(15,118,110,.10), rgba(245,158,11,.11)),
        #fff;
      box-shadow:var(--shadow);
      padding:42px;
      display:grid;
      grid-template-columns:1fr auto;
      gap:28px;
      align-items:center;
    }
    .cta-panel::after{
      content:"";
      position:absolute;
      width:260px;height:260px;
      right:-110px;bottom:-120px;
      border-radius:50%;
      background:rgba(15,118,110,.12);
    }
    .cta-panel h2{
      position:relative;
      margin:0;
      font-size:30px;
      line-height:1.3;
      font-weight:900;
      letter-spacing:-.02em;
      z-index:1;
    }
    .cta-panel p{
      position:relative;
      z-index:1;
      margin:12px 0 0;
      color:var(--muted);
      max-width:660px;
    }
    .cta-actions{
      position:relative;
      z-index:1;
      display:flex;
      gap:12px;
      flex-wrap:wrap;
      justify-content:flex-end;
    }

    .site-footer{
      background:var(--footer);
      color:rgba(255,255,255,.86);
      padding:56px 0 28px;
    }
    .footer-grid{
      display:grid;
      grid-template-columns:1.4fr .8fr 1fr;
      gap:34px;
      align-items:start;
    }
    .footer-logo .logo{color:#fff;margin-bottom:16px}
    .footer-logo .logo-mark{box-shadow:none}
    .footer-logo p,.footer-note{
      margin:0;
      color:rgba(255,255,255,.66);
      max-width:460px;
      font-size:15px;
      line-height:1.82;
    }
    .footer-block h3{
      margin:0 0 15px;
      font-size:16px;
      font-weight:900;
      color:#fff;
    }
    .footer-links{
      display:grid;
      grid-template-columns:repeat(2, minmax(0,1fr));
      gap:10px 16px;
    }
    .footer-links a{
      color:rgba(255,255,255,.70);
      font-size:14px;
      font-weight:700;
    }
    .footer-links a:hover{
      color:#fff;
      transform:translateX(2px);
    }
    .copyright{
      margin-top:34px;
      padding-top:22px;
      border-top:1px solid rgba(255,255,255,.12);
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:16px;
      flex-wrap:wrap;
      color:rgba(255,255,255,.52);
      font-size:13px;
    }

    @media (max-width: 1100px){
      .article-layout{grid-template-columns:minmax(0,1fr)}
      .side-stack{
        position:static;
        grid-template-columns:repeat(3,minmax(0,1fr));
      }
      .side-cover{min-height:220px}
      .related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media (max-width: 992px){
      .nav-cta{display:none}
      .article-title{font-size:38px}
      .article-content{padding:34px 32px}
      .footer-grid{grid-template-columns:1fr 1fr}
      .footer-logo{grid-column:1/-1}
      .cta-panel{grid-template-columns:1fr}
      .cta-actions{justify-content:flex-start}
    }
    @media (max-width: 768px){
      .container{width:min(100% - 32px, var(--container))}
      .site-header{background:rgba(255,255,255,.96)}
      .nav-wrap{min-height:64px}
      .menu-toggle{display:flex}
      .nav-links{
        position:absolute;
        left:0;
        right:0;
        top:calc(100% + 10px);
        display:none;
        flex-direction:column;
        align-items:stretch;
        gap:6px;
        padding:12px;
        background:#fff;
        border:1px solid var(--line);
        border-radius:20px;
        box-shadow:var(--shadow);
        margin-left:0;
      }
      .nav-links.is-open{display:flex}
      .nav-links a{
        padding:12px 14px;
        border-radius:14px;
      }
      .article-hero{padding:40px 0 26px}
      .breadcrumb .current{max-width:260px}
      .article-title{font-size:31px;line-height:1.25}
      .article-summary{font-size:16px}
      .article-shell{padding:28px 0 58px}
      .article-cover{margin:12px 12px 0;border-radius:18px}
      .article-cover img{aspect-ratio:16/9}
      .article-content{padding:28px 22px;font-size:16px;line-height:1.86}
      .article-content h2{font-size:24px;margin-top:34px}
      .article-content h3{font-size:20px}
      .article-actions{padding:22px;align-items:flex-start}
      .side-stack{grid-template-columns:1fr}
      .related-grid{grid-template-columns:1fr}
      .section-head{display:block}
      .section-title{font-size:27px}
      .cta-panel{padding:30px 24px}
      .cta-panel h2{font-size:25px}
      .footer-grid{grid-template-columns:1fr}
      .footer-links{grid-template-columns:1fr 1fr}
      .copyright{align-items:flex-start;flex-direction:column}
    }
    @media (max-width: 520px){
      .container{width:min(100% - 28px, var(--container))}
      .logo-text{font-size:16px}
      .logo-mark{width:38px;height:38px;border-radius:14px}
      .breadcrumb{font-size:13px}
      .breadcrumb .current{max-width:190px}
      .article-title{font-size:28px}
      .article-meta{gap:9px}
      .article-card{border-radius:22px}
      .article-content{padding:24px 18px}
      .article-content blockquote{padding:16px 18px}
      .btn{width:100%;min-height:46px}
      .article-actions .btn{width:100%}
      .cta-actions{width:100%}
      .cta-actions .btn{width:100%}
      .footer-links{grid-template-columns:1fr}
      .side-card{padding:20px}
      .related-card{padding:20px}
    }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}