:root{
      --bg:#eef6ff;
      --bg-soft:#f8fbff;
      --white:#ffffff;
      --line:#d9e7f5;
      --text:#1a334d;
      --muted:#6c849c;
      --brand:#2b78ff;
      --brand-dark:#0f58ca;
      --title:#10375f;
      --shadow:0 14px 34px rgba(20,50,80,.08);
      --radius-xl:28px;
      --radius-lg:22px;
      --radius-md:18px;
      --container:1120px;
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
      color:var(--text);
      background:linear-gradient(180deg,#f9fcff 0%,#edf6ff 100%);
      line-height:1.75;
    }

    img{max-width:100%;display:block}
    a{color:var(--brand);text-decoration:none}
    a:hover{color:var(--brand-dark)}
    .container{max-width:var(--container);margin:0 auto;padding:0 20px}

    header{
      background:rgba(255,255,255,.92);
      backdrop-filter:blur(10px);
      border-bottom:1px solid var(--line);
      position:sticky;
      top:0;
      z-index:20;
    }
    .header-inner{
      display:flex;
      justify-content:space-between;
      align-items:center;
      gap:20px;
      padding:16px 0;
    }
    .logo{
      font-size:1.1rem;
      font-weight:800;
      color:var(--brand-dark);
      letter-spacing:.02em;
    }
    .header-link{
      font-size:.96rem;
      font-weight:700;
    }

    .breadcrumbs{
      font-size:14px;
      color:var(--muted);
      padding:18px 0 6px;
    }
    .breadcrumbs a{color:var(--muted)}

    .hero{
      padding:20px 0 26px;
    }
    .hero-card{
      background:var(--white);
      border:1px solid var(--line);
      border-radius:var(--radius-xl);
      box-shadow:var(--shadow);
      overflow:hidden;
    }
    .hero-grid{
      display:grid;
      grid-template-columns:1.05fr .95fr;
      align-items:center;
    }
    .hero-copy{
      padding:40px;
    }
    .eyebrow{
      display:inline-block;
      padding:8px 14px;
      border-radius:999px;
      background:#edf5ff;
      border:1px solid #d6e6ff;
      font-size:13px;
      font-weight:700;
      color:var(--brand-dark);
      margin-bottom:18px;
    }
    h1{
      margin:0 0 16px;
      font-size:clamp(2.1rem,3vw,3.2rem);
      line-height:1.12;
      color:var(--title);
      letter-spacing:-.02em;
    }
    .hero-sub{
      margin:0 0 18px;
      color:var(--muted);
      font-size:1.04rem;
    }
    .hero-meta{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:18px;
    }
    .hero-meta span{
      padding:9px 13px;
      background:#f6faff;
      border:1px solid var(--line);
      border-radius:999px;
      font-size:14px;
      font-weight:600;
      color:#2d4964;
    }
    .hero-image{
      min-height:100%;
      background:#f3f8fe;
    }
    .hero-image img{
      width:100%;
      height:100%;
      object-fit:cover;
    }

    .content-wrap{
      padding:28px 0 0;
    }
    .article-layout{
      display:grid;
      grid-template-columns:minmax(0,1fr) 300px;
      gap:24px;
      align-items:start;
    }

    .article{
      background:var(--white);
      border:1px solid var(--line);
      border-radius:var(--radius-xl);
      box-shadow:var(--shadow);
      padding:34px;
    }

    .article h2{
      margin:34px 0 12px;
      font-size:1.75rem;
      line-height:1.25;
      color:var(--title);
    }
    .article h3{
      margin:24px 0 10px;
      font-size:1.2rem;
      color:var(--title);
    }
    .article p{
      margin:0 0 16px;
      color:#35516c;
    }
    .article ul{
      margin:0 0 18px 0;
      padding-left:20px;
      color:#35516c;
    }
    .article li{
      margin-bottom:10px;
    }

    .highlight-box{
      background:#f7fbff;
      border:1px solid var(--line);
      border-radius:18px;
      padding:18px 18px;
      margin:22px 0;
    }
    .highlight-box strong{
      color:var(--brand-dark);
    }

    .image-block{
      margin:26px 0;
      border-radius:22px;
      overflow:hidden;
      border:1px solid var(--line);
      background:#f6f9fd;
    }
    .image-block img{
      width:100%;
      height:auto;
      object-fit:cover;
    }
    .image-caption{
      padding:14px 18px;
      font-size:14px;
      color:var(--muted);
      background:#fff;
      border-top:1px solid var(--line);
    }

    .table-wrap{
      margin:24px 0;
      overflow:hidden;
      border-radius:22px;
      border:1px solid var(--line);
      box-shadow:var(--shadow);
      background:var(--white);
    }
    table{
      width:100%;
      border-collapse:collapse;
    }
    th,td{
      padding:15px 14px;
      border-bottom:1px solid var(--line);
      text-align:left;
      vertical-align:top;
      font-size:15px;
    }
    th{
      background:#f5f9ff;
      color:var(--title);
      font-weight:700;
    }

    .faq{
      display:grid;
      gap:14px;
      margin-top:14px;
    }
    details{
      background:#fff;
      border:1px solid var(--line);
      border-radius:18px;
      padding:18px 20px;
    }
    summary{
      cursor:pointer;
      font-weight:700;
      color:#153d67;
      list-style:none;
    }
    summary::-webkit-details-marker{display:none}
    details p{
      margin:12px 0 0;
    }

    .sidebar{
      position:sticky;
      top:88px;
      display:grid;
      gap:18px;
    }
    .side-card{
      background:var(--white);
      border:1px solid var(--line);
      border-radius:22px;
      box-shadow:var(--shadow);
      padding:22px;
    }
    .side-card h3{
      margin:0 0 10px;
      font-size:1.08rem;
      color:var(--title);
    }
    .side-card p{
      margin:0 0 14px;
      color:var(--muted);
      font-size:15px;
    }
    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      padding:12px 18px;
      border-radius:999px;
      font-weight:700;
      font-size:15px;
      border:1px solid transparent;
      transition:.25s ease;
    }
    .btn-primary{
      background:var(--brand);
      color:#fff;
      box-shadow:0 10px 24px rgba(43,120,255,.22);
    }
    .btn-primary:hover{
      background:var(--brand-dark);
      color:#fff;
    }
    .btn-outline{
      background:#fff;
      color:var(--brand);
      border-color:#cfe0f1;
    }
    .btn-outline:hover{
      border-color:var(--brand);
    }
    .toc{
      padding-left:18px;
      margin:0;
    }
    .toc li{margin-bottom:10px}

    footer{
      margin-top:30px;
      border-top:1px solid var(--line);
      padding:26px 0 40px;
      text-align:center;
      color:var(--muted);
      font-size:14px;
    }

    @media (max-width: 1024px){
      .article-layout{
        grid-template-columns:1fr;
      }
      .sidebar{
        position:static;
      }
    }

    @media (max-width: 820px){
      .hero-grid{
        grid-template-columns:1fr;
      }
      .hero-copy,.article{
        padding:24px;
      }
    }

    @media (max-width: 560px){
      .container{padding:0 14px}
      .hero-meta{gap:8px}
      .hero-meta span{font-size:13px}
    }