:root {
      --el-navy: #083344;
      --el-blue: #075985;
      --el-cyan: #0891b2;
      --el-sky: #e0f2fe;
      --el-ice: #f3faff;
      --el-white: #ffffff;
      --el-text: #233746;
      --el-muted: #5f7280;
      --el-line: #d6e7ef;
      --el-green: #0f766e;
      --el-amber: #b45309;
      --el-shadow: 0 18px 50px rgba(8, 51, 68, 0.10);
      --el-radius: 22px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      background: #f7fbfd;
      color: var(--el-text);
      font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
      font-size: 17px;
      line-height: 1.72;
    }
    img { max-width: 100%; height: auto; }
    a { color: var(--el-blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }
    a:hover { color: var(--el-cyan); }
    .el-blog { overflow: hidden; }
    .el-container { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }

    .el-hero {
      position: relative;
      isolation: isolate;
      padding: 88px 0 74px;
      color: var(--el-white);
      background:
        radial-gradient(circle at 85% 18%, rgba(34, 211, 238, .25), transparent 28%),
        radial-gradient(circle at 10% 80%, rgba(14, 165, 233, .20), transparent 32%),
        linear-gradient(135deg, #062b3c 0%, #075985 56%, #0e7490 100%);
    }
    .el-hero::after {
      content: "";
      position: absolute;
      z-index: -1;
      inset: auto -8% -80px 42%;
      height: 220px;
      transform: rotate(-7deg);
      border-radius: 50%;
      background: rgba(255, 255, 255, .05);
    }
    .el-breadcrumb {
      margin-bottom: 25px;
      color: #bae6fd;
      font-size: 14px;
    }
    .el-breadcrumb a { color: #e0f2fe; text-decoration: none; }
    .el-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 17px;
      padding: 7px 12px;
      border: 1px solid rgba(255, 255, 255, .28);
      border-radius: 999px;
      background: rgba(255, 255, 255, .10);
      color: #e6f8ff;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: .08em;
      text-transform: uppercase;
    }
    .el-hero h1 {
      max-width: 930px;
      margin: 0;
      color: #fff;
      font-size: clamp(38px, 6vw, 68px);
      line-height: 1.06;
      letter-spacing: -.045em;
    }
    .el-hero-lead {
      max-width: 780px;
      margin: 24px 0 0;
      color: #dff6ff;
      font-size: clamp(18px, 2.3vw, 23px);
      line-height: 1.5;
    }
    .el-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 10px 20px;
      margin-top: 28px;
      color: #c8eefb;
      font-size: 14px;
    }

    .el-main { padding: 52px 0 88px; }
    .el-layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 280px;
      gap: 42px;
      align-items: start;
    }
    .el-article { min-width: 0; }
    .el-article h2,
    .el-article h3 {
      color: var(--el-navy);
      scroll-margin-top: 26px;
    }
    .el-article h2 {
      margin: 58px 0 18px;
      font-size: clamp(27px, 3vw, 38px);
      line-height: 1.18;
      letter-spacing: -.025em;
    }
    .el-article h3 {
      margin: 32px 0 10px;
      font-size: 23px;
      line-height: 1.3;
    }
    .el-article p { margin: 0 0 19px; }
    .el-article ul, .el-article ol { padding-left: 24px; }
    .el-article li { margin: 9px 0; }
    .el-article strong { color: #143e50; }

    .el-answer {
      margin-top: -88px;
      padding: 30px;
      border: 1px solid #c8e2ee;
      border-top: 5px solid var(--el-cyan);
      border-radius: var(--el-radius);
      background: var(--el-white);
      box-shadow: var(--el-shadow);
    }
    .el-answer-label {
      margin-bottom: 8px;
      color: var(--el-cyan);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: .09em;
      text-transform: uppercase;
    }
    .el-answer p:last-child { margin-bottom: 0; }

    .el-key-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
      margin: 27px 0 6px;
    }
    .el-key-card {
      padding: 21px;
      border: 1px solid var(--el-line);
      border-radius: 17px;
      background: linear-gradient(180deg, #fff, #f8fdff);
    }
    .el-key-card b {
      display: block;
      margin-bottom: 5px;
      color: var(--el-blue);
      font-size: 15px;
    }
    .el-key-card span { color: var(--el-muted); font-size: 14px; line-height: 1.5; }

    .el-callout {
      margin: 28px 0;
      padding: 23px 25px;
      border-left: 5px solid var(--el-cyan);
      border-radius: 4px 16px 16px 4px;
      background: var(--el-sky);
    }
    .el-callout strong { display: block; margin-bottom: 5px; color: var(--el-blue); }
    .el-callout p:last-child { margin-bottom: 0; }
    .el-callout--fda {
      border-left-color: var(--el-amber);
      background: #fff8eb;
    }
    .el-callout--fda strong { color: #92400e; }

    .el-table-wrap {
      margin: 28px 0;
      overflow-x: auto;
      border: 1px solid var(--el-line);
      border-radius: 18px;
      background: #fff;
      box-shadow: 0 10px 30px rgba(8, 51, 68, .06);
    }
    .el-table {
      width: 100%;
      min-width: 720px;
      border-collapse: collapse;
      font-size: 15px;
      line-height: 1.5;
    }
    .el-table th,
    .el-table td { padding: 16px 18px; border-bottom: 1px solid var(--el-line); vertical-align: top; }
    .el-table thead th { color: #fff; text-align: left; background: var(--el-blue); }
    .el-table tbody tr:nth-child(even) { background: #f7fbfd; }
    .el-table tbody tr:last-child td { border-bottom: 0; }
    .el-table td:first-child { color: var(--el-navy); font-weight: 750; }

    .el-split {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 18px;
      margin: 26px 0;
    }
    .el-panel {
      padding: 25px;
      border: 1px solid var(--el-line);
      border-radius: 18px;
      background: #fff;
    }
    .el-panel h3 { margin-top: 0; }
    .el-panel ul { margin-bottom: 0; }
    .el-panel--diode { border-top: 4px solid var(--el-blue); }
    .el-panel--shr { border-top: 4px solid var(--el-green); }

    .el-checklist {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
      padding: 0;
      list-style: none;
    }
    .el-checklist li {
      position: relative;
      margin: 0;
      padding: 14px 16px 14px 43px;
      border: 1px solid var(--el-line);
      border-radius: 14px;
      background: #fff;
    }
    .el-checklist li::before {
      content: "✓";
      position: absolute;
      left: 15px;
      top: 13px;
      display: grid;
      width: 21px;
      height: 21px;
      place-items: center;
      border-radius: 50%;
      background: #ccfbf1;
      color: var(--el-green);
      font-size: 13px;
      font-weight: 900;
    }

    .el-product {
      display: grid;
      grid-template-columns: .85fr 1.15fr;
      gap: 34px;
      align-items: center;
      margin: 52px 0 34px;
      padding: 32px;
      border-radius: 26px;
      background: linear-gradient(135deg, #e9f8ff 0%, #fff 55%, #e7faf7 100%);
      box-shadow: var(--el-shadow);
    }
    .el-product-image {
      min-height: 300px;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 14px;
      border-radius: 19px;
      background: #fff;
    }
    .el-product-image img { max-height: 360px; object-fit: contain; }
    .el-product-copy h2 { margin: 0 0 14px; }
    .el-badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0; }
    .el-badge {
      padding: 6px 10px;
      border-radius: 999px;
      background: #dff4fb;
      color: var(--el-blue);
      font-size: 13px;
      font-weight: 750;
    }
    .el-button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 12px 20px;
      border-radius: 12px;
      color: #fff !important;
      font-weight: 800;
      text-decoration: none;
      background: linear-gradient(135deg, var(--el-blue), var(--el-cyan));
      box-shadow: 0 10px 24px rgba(7, 89, 133, .22);
    }
    .el-button:hover { transform: translateY(-1px); }
    .el-reg-note { margin-top: 13px; color: var(--el-muted); font-size: 13px; line-height: 1.55; }

    .el-faq { margin-top: 18px; }
    .el-faq details {
      margin: 12px 0;
      border: 1px solid var(--el-line);
      border-radius: 15px;
      background: #fff;
    }
    .el-faq summary {
      cursor: pointer;
      padding: 18px 48px 18px 20px;
      color: var(--el-navy);
      font-weight: 800;
      line-height: 1.4;
    }
    .el-faq details div { padding: 0 20px 18px; color: var(--el-muted); }
    .el-faq details p:last-child { margin-bottom: 0; }

    .el-references {
      margin-top: 48px;
      padding: 24px;
      border: 1px solid var(--el-line);
      border-radius: 17px;
      background: #f8fcfe;
      color: var(--el-muted);
      font-size: 14px;
    }
    .el-references h2 { margin-top: 0; font-size: 24px; }
    .el-disclaimer { margin-top: 22px; color: #6b7280; font-size: 13px; }

    .el-toc {
      position: sticky;
      top: 24px;
      padding: 22px;
      border: 1px solid var(--el-line);
      border-radius: 18px;
      background: rgba(255, 255, 255, .94);
      box-shadow: 0 12px 35px rgba(8, 51, 68, .07);
    }
    .el-toc-title {
      margin: 0 0 12px;
      color: var(--el-navy);
      font-size: 15px;
      font-weight: 850;
      letter-spacing: .08em;
      text-transform: uppercase;
    }
    .el-toc ol { margin: 0; padding-left: 22px; }
    .el-toc li { margin: 8px 0; color: #78909c; font-size: 13px; }
    .el-toc a { color: #45616e; text-decoration: none; }
    .el-toc a:hover { color: var(--el-cyan); }
    .el-toc-cta {
      display: block;
      margin-top: 17px;
      padding: 11px 13px;
      border-radius: 10px;
      color: #fff !important;
      font-size: 13px;
      font-weight: 800;
      text-align: center;
      text-decoration: none;
      background: var(--el-blue);
    }

    @media (max-width: 920px) {
      .el-layout { grid-template-columns: 1fr; }
      .el-toc { position: static; order: -1; }
      .el-key-grid { grid-template-columns: 1fr; }
      .el-product { grid-template-columns: 1fr; }
    }
    @media (max-width: 680px) {
      body { font-size: 16px; }
      .el-container { width: min(100% - 24px, 1120px); }
      .el-hero { padding: 60px 0 110px; }
      .el-main { padding-top: 0; }
      .el-answer { margin-top: -74px; padding: 23px; }
      .el-split, .el-checklist { grid-template-columns: 1fr; }
      .el-product { padding: 22px; }
      .el-product-image { min-height: 230px; }
    }