:root{
      --bg:#ffffff;
      --surface:#f7fafc;
      --text:#0b1220;
      --muted:#5b6776;
      --brand:#245FE6;
      --accent:#00BFA6;
      --border:#e6ecf2;
      --radius:16px;
      --shadow:0 12px 28px rgba(16,24,40,.08);
      --wrap:1080px;
    }
    *{box-sizing:border-box}
    body{
      margin:0;
      font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial;
      color:var(--text);
      background:var(--bg);
      line-height:1.7;
      -webkit-font-smoothing:antialiased;
      -moz-osx-font-smoothing:grayscale;
    }
    a{color:var(--brand);text-decoration:none}
    a:hover{text-decoration:underline}
    .wrap{max-width:var(--wrap);margin:0 auto;padding:28px 18px 56px}

    /* Hero */
    header.hero{
      padding:72px 18px 56px;
      background:
        radial-gradient(900px 360px at -10% -40%, rgba(36,95,230,.08), transparent 60%),
        radial-gradient(700px 300px at 110% -10%, rgba(0,191,166,.10), transparent 60%),
        var(--bg);
      border-bottom:1px solid var(--border);
    }
    header .title{
      font-size:clamp(28px,4.4vw,46px);
      line-height:1.12;
      margin:0 0 12px;
      font-weight:800;
    }
    header .lead{
      color:var(--muted);
      font-size:clamp(15px,1.9vw,18px);
      max-width:860px;
      margin:0 0 18px;
    }
    .cta-row{display:flex;gap:12px;flex-wrap:wrap}
    .btn{
      display:inline-flex;align-items:center;gap:8px;
      padding:12px 16px;border-radius:12px;border:1px solid transparent;
      background:linear-gradient(135deg,var(--brand),var(--accent));
      color:#fff;font-weight:700;box-shadow:var(--shadow);
      transition:transform .15s ease, box-shadow .15s ease;
    }
    .btn:hover{transform:translateY(-1px)}

    /* Layout */
    main.grid{display:grid;grid-template-columns:280px 1fr;gap:28px}
    @media (max-width: 980px){ main.grid{grid-template-columns:1fr} }

    nav.toc{
      position:sticky;top:16px;align-self:start;
      background:var(--surface);border:1px solid var(--border);
      padding:16px;border-radius:12px;box-shadow:var(--shadow)
    }
    nav.toc h2{margin:0 0 8px;font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
    nav.toc a{display:block;padding:8px 0;color:var(--text)}
    nav.toc a:hover{color:var(--brand)}

    article{
      background:#fff;border:1px solid var(--border);
      border-radius:14px;box-shadow:var(--shadow);overflow:hidden
    }
    .section{padding:26px 26px 6px}
    .section h2{font-size:clamp(22px,3vw,28px);margin:0 0 6px}
    .section p{margin:10px 0}
    .muted{color:var(--muted)}

    .grid-2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
    @media (max-width: 720px){ .grid-2{grid-template-columns:1fr} }

    figure{margin:0;border:1px solid var(--border);border-radius:12px;overflow:hidden}
    figure img{display:block;width:100%;height:auto}
    figure figcaption{padding:10px 12px;background:var(--surface);font-size:13px;color:var(--muted)}

    .card{
      background:var(--surface);border:1px solid var(--border);border-radius:12px;
      padding:18px
    }

    ul.check{list-style:none;padding-left:0;margin:12px 0}
    ul.check li{padding-left:28px;position:relative;margin:8px 0}
    ul.check li::before{
      content:"✓";position:absolute;left:0;top:0;color:var(--accent);font-weight:800
    }

    table{width:100%;border-collapse:separate;border-spacing:0;margin:12px 0 22px;border-radius:12px;overflow:hidden}
    th,td{padding:12px 14px;border-bottom:1px solid var(--border);vertical-align:top}
    th{font-size:13px;text-align:left;color:var(--muted);letter-spacing:.04em;text-transform:uppercase}
    tr:last-child td{border-bottom:none}

    .notice{
      background:#ecfeff;border:1px solid #99f6e4;color:#0f766e;border-radius:12px;
      padding:14px;margin:8px 0
    }

    footer.page{text-align:center;color:var(--muted);padding:22px}
    .sticky-cta{
      position:fixed;inset:auto 16px 16px auto;z-index:50
    }
    .sticky-cta a{
      background:linear-gradient(135deg,var(--brand),var(--accent));
      color:#fff;border-radius:999px;padding:10px 14px;font-weight:700;box-shadow:var(--shadow)
    }
    @media (min-width:981px){ .sticky-cta{display:none} }