:root{
      --bg:#f4f9ff;
      --panel:#ffffff;
      --panel-soft:#edf6ff;
      --ink:#10233e;
      --muted:#58708f;
      --line:#d9e8f6;
      --brand:#1f6feb;
      --brand-2:#5ab0ff;
      --accent:#0ea5e9;
      --shadow:0 20px 50px rgba(16,35,62,.10);
      --radius-xl:28px;
      --radius-lg:22px;
      --radius-md:16px;
      --max:1180px;
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:'Inter',sans-serif;
      color:var(--ink);
      background:
        radial-gradient(circle at top left, rgba(90,176,255,.16), transparent 30%),
        linear-gradient(180deg, #f7fbff 0%, #eef6ff 100%);
      line-height:1.75;
    }

    img{max-width:100%;display:block}
    a{color:var(--brand);text-decoration:none}
    a:hover{text-decoration:underline}

    .container{
      width:min(calc(100% - 32px), var(--max));
      margin:0 auto;
    }

    .hero-wrap{
      padding:34px 0 18px;
    }

    .breadcrumbs{
      display:flex;
      flex-wrap:wrap;
      gap:8px;
      font-size:14px;
      color:var(--muted);
      margin-bottom:20px;
    }

    .breadcrumbs a{
      color:var(--muted);
    }

    .hero{
      background:linear-gradient(135deg, #ffffff 0%, #eef7ff 100%);
      border:1px solid var(--line);
      border-radius:var(--radius-xl);
      box-shadow:var(--shadow);
      overflow:hidden;
      display:grid;
      grid-template-columns:1.15fr .85fr;
      gap:0;
    }

    .hero-copy{
      padding:56px 46px;
    }

    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:8px 14px;
      border-radius:999px;
      background:var(--panel-soft);
      color:var(--brand);
      font-weight:700;
      font-size:13px;
      letter-spacing:.02em;
      margin-bottom:18px;
    }

    h1,h2,h3{
      margin:0 0 16px;
      line-height:1.2;
      color:#0e2340;
    }

    h1{
      font-family:'Playfair Display',serif;
      font-size:clamp(34px, 5vw, 58px);
      letter-spacing:-0.02em;
    }

    h2{
      font-size:clamp(24px, 3vw, 34px);
      margin-top:0;
    }

    h3{
      font-size:22px;
      margin-top:0;
    }

    .lead{
      font-size:18px;
      color:var(--muted);
      max-width:760px;
      margin-bottom:24px;
    }

    .hero-meta{
      display:flex;
      flex-wrap:wrap;
      gap:12px;
      margin-top:26px;
    }

    .meta-pill{
      padding:10px 14px;
      border:1px solid var(--line);
      background:#fff;
      border-radius:999px;
      font-size:14px;
      color:var(--muted);
      font-weight:600;
    }

    .hero-visual{
      min-height:100%;
      background:
        linear-gradient(180deg, rgba(31,111,235,.06), rgba(14,165,233,.10)),
        radial-gradient(circle at 30% 30%, rgba(90,176,255,.28), transparent 35%),
        linear-gradient(145deg, #dff0ff, #f7fbff 55%, #e8f4ff);
      display:flex;
      align-items:center;
      justify-content:center;
      padding:28px;
    }

    .visual-card{
      width:100%;
      max-width:430px;
      background:rgba(255,255,255,.78);
      backdrop-filter:blur(8px);
      border:1px solid rgba(255,255,255,.65);
      border-radius:24px;
      padding:26px;
      box-shadow:0 18px 50px rgba(31,111,235,.10);
    }

    .visual-label{
      font-size:13px;
      font-weight:700;
      color:var(--brand);
      text-transform:uppercase;
      letter-spacing:.06em;
      margin-bottom:14px;
    }

    .visual-grid{
      display:grid;
      grid-template-columns:repeat(2,1fr);
      gap:14px;
    }

    .mini-box{
      background:#fff;
      border:1px solid var(--line);
      border-radius:16px;
      padding:16px;
    }

    .mini-box strong{
      display:block;
      font-size:14px;
      margin-bottom:6px;
      color:#0f2747;
    }

    .mini-box span{
      font-size:13px;
      color:var(--muted);
      display:block;
      line-height:1.55;
    }

    .content-wrap{
      padding:24px 0 60px;
    }

    .content-grid{
      display:grid;
      grid-template-columns:minmax(0, 1fr) 310px;
      gap:28px;
      align-items:start;
    }

    .article{
      background:var(--panel);
      border:1px solid var(--line);
      border-radius:var(--radius-xl);
      box-shadow:var(--shadow);
      padding:40px;
    }

    .article p{
      margin:0 0 18px;
      color:#24415f;
      font-size:16.5px;
    }

    .article strong{
      color:#0f2747;
    }

    .section{
      margin-top:34px;
      padding-top:30px;
      border-top:1px solid #e7f0f8;
    }

    .info-box{
      background:linear-gradient(180deg, #f8fbff, #eef6ff);
      border:1px solid var(--line);
      border-radius:22px;
      padding:24px;
      margin:24px 0;
    }

    .info-box h3{
      margin-bottom:12px;
    }

    .cards{
      display:grid;
      grid-template-columns:repeat(2,minmax(0,1fr));
      gap:18px;
      margin:24px 0;
    }

    .card{
      border:1px solid var(--line);
      border-radius:20px;
      background:#fbfdff;
      padding:22px;
    }

    .card h3{
      font-size:18px;
      margin-bottom:10px;
    }

    .card p{
      margin:0;
      font-size:15px;
    }

    .steps{
      display:grid;
      gap:14px;
      margin:20px 0 8px;
    }

    .step{
      display:grid;
      grid-template-columns:54px 1fr;
      gap:16px;
      align-items:start;
      padding:18px;
      border-radius:18px;
      border:1px solid var(--line);
      background:#fcfeff;
    }

    .step-num{
      width:54px;
      height:54px;
      border-radius:16px;
      display:flex;
      align-items:center;
      justify-content:center;
      background:linear-gradient(135deg, var(--brand), var(--accent));
      color:#fff;
      font-weight:800;
      font-size:18px;
      box-shadow:0 12px 28px rgba(31,111,235,.20);
    }

    .step h3{
      margin-bottom:8px;
      font-size:18px;
    }

    .step p{
      margin:0;
      font-size:15.5px;
    }

    ul.clean{
      margin:0;
      padding-left:20px;
      color:#24415f;
    }

    ul.clean li{
      margin:0 0 10px;
    }

    .cta{
      margin-top:34px;
      border-radius:24px;
      padding:28px;
      background:linear-gradient(135deg, #0f2747 0%, #1f6feb 65%, #54b5ff 100%);
      color:#fff;
      overflow:hidden;
      position:relative;
    }

    .cta::after{
      content:"";
      position:absolute;
      inset:auto -40px -40px auto;
      width:180px;
      height:180px;
      background:rgba(255,255,255,.12);
      border-radius:50%;
      filter:blur(2px);
    }

    .cta h2,
    .cta p{
      color:#fff;
      position:relative;
      z-index:1;
    }

    .cta p{
      margin:0 0 18px;
      max-width:780px;
    }

    .btn-row{
      display:flex;
      flex-wrap:wrap;
      gap:14px;
      position:relative;
      z-index:1;
    }

    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      min-height:48px;
      padding:0 18px;
      border-radius:999px;
      font-weight:700;
      font-size:15px;
      transition:.2s ease;
    }

    .btn-primary{
      background:#fff;
      color:#0f2747;
    }

    .btn-primary:hover{
      text-decoration:none;
      transform:translateY(-1px);
    }

    .btn-outline{
      border:1px solid rgba(255,255,255,.4);
      color:#fff;
      background:rgba(255,255,255,.08);
    }

    .btn-outline:hover{
      text-decoration:none;
      background:rgba(255,255,255,.14);
    }

    .sidebar{
      position:sticky;
      top:20px;
      display:grid;
      gap:18px;
    }

    .side-card{
      background:#fff;
      border:1px solid var(--line);
      border-radius:22px;
      box-shadow:var(--shadow);
      padding:24px;
    }

    .side-card h3{
      font-size:18px;
      margin-bottom:14px;
    }

    .toc{
      display:grid;
      gap:10px;
    }

    .toc a{
      display:block;
      padding:10px 12px;
      border-radius:12px;
      color:#214261;
      background:#f7fbff;
      border:1px solid #e6f0fa;
      font-size:14px;
      font-weight:600;
    }

    .toc a:hover{
      text-decoration:none;
      background:#eef6ff;
    }

    .side-list{
      display:grid;
      gap:12px;
    }

    .side-item{
      padding:12px 0;
      border-top:1px solid #e8f1f9;
      color:#44607f;
      font-size:14.5px;
    }

    .side-item:first-child{
      border-top:0;
      padding-top:0;
    }

    .faq{
      display:grid;
      gap:16px;
      margin-top:20px;
    }

    details{
      border:1px solid var(--line);
      background:#fbfdff;
      border-radius:18px;
      padding:18px 18px;
    }

    summary{
      cursor:pointer;
      font-weight:700;
      color:#123354;
      list-style:none;
    }

    summary::-webkit-details-marker{
      display:none;
    }

    details p{
      margin:14px 0 0;
      font-size:15.5px;
    }

    .author-box{
      margin-top:28px;
      padding:22px;
      border:1px solid var(--line);
      border-radius:20px;
      background:#f9fcff;
    }

    .author-box h3{
      margin-bottom:8px;
      font-size:18px;
    }

    .author-box p{
      margin:0;
      font-size:15px;
    }

    footer{
      padding:26px 0 48px;
      color:var(--muted);
      font-size:14px;
    }

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

    @media (max-width: 720px){
      .hero-copy,
      .article{
        padding:26px 20px;
      }
      .hero-visual{
        padding:20px;
      }
      .cards{
        grid-template-columns:1fr;
      }
      .step{
        grid-template-columns:1fr;
      }
      .step-num{
        width:48px;
        height:48px;
        border-radius:14px;
      }
      .lead{
        font-size:16px;
      }
      .meta-pill{
        font-size:13px;
      }
    }