:root{
      --bg:#f8fafc;
      --surface:#ffffff;
      --ink:#111827;
      --muted:#4b5563;
      --soft:#e5e7eb;
      --brand:#111827;
      --accent:#2563eb;
      --accent-dark:#1d4ed8;
      --warn:#fff7ed;
      --warn-border:#fed7aa;
      --radius:18px;
      --shadow:0 18px 45px rgba(15,23,42,.08);
      --max:1120px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
      background:var(--bg);
      color:var(--ink);
      line-height:1.65;
      text-rendering:optimizeLegibility;
    }
    a{color:var(--accent);text-decoration:none}
    a:hover{text-decoration:underline}
    .skip-link{
      position:absolute;left:-999px;top:auto;width:1px;height:1px;overflow:hidden;
    }
    .skip-link:focus{
      left:16px;top:16px;width:auto;height:auto;background:#fff;padding:10px 14px;border-radius:10px;z-index:99;
    }
    header{
      background:rgba(255,255,255,.94);
      backdrop-filter:saturate(180%) blur(14px);
      border-bottom:1px solid var(--soft);
      position:sticky;
      top:0;
      z-index:20;
    }
    .nav{
      max-width:var(--max);
      margin:auto;
      padding:14px 18px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:18px;
    }
    .brand{
      color:var(--ink);
      font-weight:800;
      letter-spacing:-.02em;
      display:flex;
      flex-direction:column;
      line-height:1.15;
    }
    .brand span{font-size:.82rem;color:var(--muted);font-weight:600}
    nav ul{
      display:flex;
      gap:14px;
      list-style:none;
      margin:0;
      padding:0;
      align-items:center;
      flex-wrap:wrap;
      justify-content:flex-end;
    }
    nav a{
      color:var(--ink);
      font-size:.94rem;
      font-weight:650;
    }
    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:8px;
      border-radius:999px;
      padding:12px 18px;
      background:var(--accent);
      color:#fff;
      font-weight:750;
      box-shadow:0 10px 25px rgba(37,99,235,.18);
      border:0;
    }
    .btn:hover{background:var(--accent-dark);text-decoration:none}
    .btn.secondary{
      background:#fff;
      color:var(--ink);
      border:1px solid var(--soft);
      box-shadow:none;
    }
    .hero{
      background:linear-gradient(135deg,#0f172a 0%,#1f2937 55%,#111827 100%);
      color:#fff;
      padding:64px 18px 46px;
    }
    .hero-inner{
      max-width:var(--max);
      margin:auto;
      display:grid;
      grid-template-columns:1.35fr .65fr;
      gap:28px;
      align-items:center;
    }
    .eyebrow{
      color:#bfdbfe;
      font-weight:800;
      letter-spacing:.06em;
      text-transform:uppercase;
      font-size:.8rem;
      margin:0 0 10px;
    }
    h1,h2,h3{line-height:1.18;letter-spacing:-.035em}
    h1{
      font-size:clamp(2rem,5vw,4.1rem);
      margin:0 0 18px;
    }
    .lead{
      font-size:clamp(1.05rem,2vw,1.24rem);
      color:#e5e7eb;
      margin:0 0 24px;
      max-width:760px;
    }
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap}
    .hero-card{
      background:rgba(255,255,255,.08);
      border:1px solid rgba(255,255,255,.18);
      border-radius:var(--radius);
      padding:22px;
    }
    .hero-card ul{margin:12px 0 0;padding-left:20px}
    main{
      max-width:var(--max);
      margin:auto;
      padding:34px 18px 56px;
    }
    .notice{
      background:var(--warn);
      border:1px solid var(--warn-border);
      border-radius:var(--radius);
      padding:18px 20px;
      margin:0 0 26px;
    }
    .grid{
      display:grid;
      grid-template-columns:repeat(3,1fr);
      gap:18px;
      margin:24px 0;
    }
    .card{
      background:var(--surface);
      border:1px solid var(--soft);
      border-radius:var(--radius);
      padding:22px;
      box-shadow:var(--shadow);
    }
    .card h3{margin-top:0}
    .content{
      display:grid;
      grid-template-columns:minmax(0,1fr) 310px;
      gap:28px;
      align-items:start;
    }
    article{
      background:#fff;
      border:1px solid var(--soft);
      border-radius:var(--radius);
      padding:28px;
      box-shadow:var(--shadow);
    }
    article h2{font-size:1.75rem;margin-top:34px}
    article h2:first-child{margin-top:0}
    article h3{font-size:1.25rem;margin-top:26px}
    article p{margin:12px 0}
    article ul,article ol{padding-left:24px}
    .toc{
      position:sticky;
      top:92px;
      background:#fff;
      border:1px solid var(--soft);
      border-radius:var(--radius);
      padding:18px;
      box-shadow:var(--shadow);
    }
    .toc h2{
      font-size:1rem;
      margin:0 0 8px;
      letter-spacing:0;
    }
    .toc ul{list-style:none;margin:0;padding:0}
    .toc li{margin:8px 0}
    .toc a{color:var(--muted);font-weight:650;font-size:.94rem}
    .steps{
      counter-reset:step;
      display:grid;
      gap:14px;
      margin:20px 0;
    }
    .step{
      border:1px solid var(--soft);
      border-radius:16px;
      padding:18px;
      background:#f9fafb;
    }
    .step::before{
      counter-increment:step;
      content:counter(step);
      display:inline-grid;
      place-items:center;
      width:34px;height:34px;
      border-radius:50%;
      background:var(--brand);
      color:#fff;
      font-weight:800;
      margin-right:8px;
    }
    .links-grid{
      display:grid;
      grid-template-columns:repeat(2,1fr);
      gap:14px;
      margin:18px 0;
    }
    .link-box{
      border:1px solid var(--soft);
      border-radius:16px;
      padding:16px;
      background:#f9fafb;
    }
    .faq details{
      border:1px solid var(--soft);
      border-radius:14px;
      background:#fff;
      padding:16px 18px;
      margin:12px 0;
    }
    .faq summary{
      cursor:pointer;
      font-weight:800;
    }
    .cta{
      background:linear-gradient(135deg,#eff6ff,#ffffff);
      border:1px solid #bfdbfe;
      border-radius:var(--radius);
      padding:24px;
      margin-top:30px;
    }
    footer{
      border-top:1px solid var(--soft);
      background:#fff;
      padding:30px 18px;
      color:var(--muted);
    }
    .footer-inner{
      max-width:var(--max);
      margin:auto;
      display:flex;
      justify-content:space-between;
      gap:18px;
      flex-wrap:wrap;
    }
    .small{font-size:.92rem;color:var(--muted)}
    .updated{
      display:inline-block;
      border:1px solid var(--soft);
      border-radius:999px;
      padding:6px 12px;
      background:#fff;
      color:var(--muted);
      font-weight:650;
      font-size:.9rem;
      margin-bottom:16px;
    }
    @media (max-width:900px){
      .hero-inner,.content{grid-template-columns:1fr}
      .toc{position:relative;top:auto}
      .grid{grid-template-columns:1fr}
      .links-grid{grid-template-columns:1fr}
      .nav{align-items:flex-start;flex-direction:column}
      nav ul{justify-content:flex-start}
      article{padding:22px}
    }
    @media (max-width:560px){
      .hero{padding-top:42px}
      .hero-actions .btn{width:100%}
      nav ul{gap:10px}
      nav a{font-size:.9rem}
    }