:root {
      --navy: #123b56;
      --blue: #168fc1;
      --ice: #eef9fc;
      --ink: #203746;
      --muted: #607582;
      --line: #dcebf0;
      --white: #ffffff;
      --shadow: 0 18px 50px rgba(18, 59, 86, .10);
    }

    * { box-sizing: border-box; }

    html { scroll-behavior: smooth; }

    body {
      margin: 0;
      color: var(--ink);
      background: #f8fcfd;
      font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      line-height: 1.75;
    }

    a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }
    a:hover { color: var(--navy); }

    .container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }

    .site-header {
      background: rgba(255, 255, 255, .96);
      border-bottom: 1px solid var(--line);
      position: sticky;
      top: 0;
      z-index: 10;
      backdrop-filter: blur(10px);
    }

    .header-inner {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .brand {
      color: var(--navy);
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: .04em;
      text-decoration: none;
    }

    main { padding: 26px 0 80px; }

    .article-shell {
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 24px;
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .article-hero {
      padding: clamp(34px, 6vw, 72px) clamp(24px, 8vw, 96px) 34px;
      background: linear-gradient(135deg, #f2fbfd 0%, #ffffff 68%);
    }

    .eyebrow {
      color: var(--blue);
      font-size: .78rem;
      font-weight: 800;
      letter-spacing: .13em;
      margin: 0 0 14px;
      text-transform: uppercase;
    }

    h1, h2, h3 { color: var(--navy); line-height: 1.2; }
    h1 { max-width: 900px; font-size: clamp(2rem, 4vw, 3.55rem); margin: 0; letter-spacing: -.035em; }
    h2 { font-size: clamp(1.45rem, 2.5vw, 2.05rem); margin: 48px 0 16px; }
    h3 { font-size: 1.15rem; margin: 28px 0 8px; }

    .lead {
      color: #46616e;
      font-size: clamp(1.05rem, 1.8vw, 1.25rem);
      max-width: 850px;
      margin: 22px 0 18px;
    }

    .article-meta { color: var(--muted); font-size: .9rem; }
    .article-meta span { padding: 0 8px; }

    .hero-media { margin: 0; background: #f1fafc; }
    .hero-media img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; }
    .hero-media figcaption { color: var(--muted); font-size: .82rem; padding: 10px 24px 0; }

    .article-layout {
      display: grid;
      grid-template-columns: 250px minmax(0, 1fr);
      gap: clamp(28px, 5vw, 72px);
      padding: 42px clamp(24px, 8vw, 96px) 74px;
    }

    .toc {
      align-self: start;
      position: sticky;
      top: 102px;
      border-left: 3px solid var(--blue);
      padding: 6px 0 6px 18px;
    }

    .toc strong { color: var(--navy); display: block; font-size: .92rem; margin-bottom: 10px; }
    .toc a { color: var(--muted); display: block; font-size: .87rem; line-height: 1.45; margin: 9px 0; text-decoration: none; }
    .toc a:hover { color: var(--blue); }

    .article-content { min-width: 0; max-width: 760px; }
    .article-content p { margin: 0 0 16px; }
    .article-content ul, .article-content ol { margin: 12px 0 22px; padding-left: 22px; }
    .article-content li { margin: 8px 0; }

    .note, .cta-box {
      border-radius: 16px;
      padding: 22px 24px;
      margin: 26px 0;
    }

    .note { background: var(--ice); border: 1px solid #ccecf5; }
    .note strong { color: var(--navy); }

    .feature-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
      margin: 20px 0 28px;
    }

    .feature-card {
      background: #fbfeff;
      border: 1px solid var(--line);
      border-radius: 14px;
      padding: 18px;
    }

    .feature-card strong { color: var(--navy); display: block; margin-bottom: 5px; }
    .feature-card p { color: var(--muted); font-size: .93rem; margin: 0; }

    .comparison {
      border-collapse: collapse;
      width: 100%;
      margin: 18px 0 28px;
      font-size: .94rem;
    }

    .comparison th, .comparison td { border: 1px solid var(--line); padding: 13px 14px; text-align: left; vertical-align: top; }
    .comparison th { background: var(--ice); color: var(--navy); font-weight: 750; }

    .faq details { border-bottom: 1px solid var(--line); padding: 16px 0; }
    .faq summary { color: var(--navy); cursor: pointer; font-weight: 750; }
    .faq details p { color: var(--muted); margin: 12px 0 0; }

    .cta-box {
      background: linear-gradient(135deg, var(--navy), #146e98);
      color: #ffffff;
      margin-top: 44px;
    }

    .cta-box h2 { color: #ffffff; margin-top: 0; }
    .cta-box p { color: #e7f7fb; }
    .cta-button { display: inline-block; background: #ffffff; border-radius: 999px; color: var(--navy); font-weight: 800; padding: 12px 19px; text-decoration: none; }
    .cta-button:hover { background: #dff6fb; color: var(--navy); }

    .disclaimer { color: var(--muted); font-size: .86rem; margin-top: 30px; }

    .site-footer { color: var(--muted); font-size: .86rem; padding: 22px 0 36px; text-align: center; }

    @media (max-width: 800px) {
      .header-inner { align-items: flex-start; flex-direction: column; justify-content: center; padding: 14px 0; }
      .article-layout { grid-template-columns: 1fr; }
      .toc { position: static; }
    }

    @media (max-width: 560px) {
      .container { width: min(100% - 26px, 1160px); }
      .article-shell { border-radius: 16px; }
      .article-layout { padding: 30px 20px 52px; }
      .article-hero { padding: 34px 20px 28px; }
      .feature-grid { grid-template-columns: 1fr; }
      .comparison { display: block; overflow-x: auto; white-space: nowrap; }
    }