:root {
      --ink: #18324b;
      --muted: #607286;
      --blue: #1785b5;
      --blue-dark: #0d496d;
      --ice: #eaf6fb;
      --line: #dce7ee;
      --paper: #ffffff;
      --soft: #f5f9fb;
      --shadow: 0 18px 48px rgba(20, 56, 78, .09);
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: #f2f7f9;
      font-family: Arial, Helvetica, sans-serif;
      line-height: 1.72;
    }
    a { color: #0875a5; text-underline-offset: 3px; }
    a:hover { color: #064d70; }
    .page-wrap { width: min(1120px, calc(100% - 36px)); margin: 0 auto; padding: 26px 0 64px; }
    .breadcrumbs { display: flex; flex-wrap: wrap; gap: 9px; align-items: center; margin: 0 0 20px; color: var(--muted); font-size: .9rem; }
    .breadcrumbs a { color: var(--muted); text-decoration: none; }
    .breadcrumbs a:hover { color: var(--blue); }
    .hero {
      position: relative;
      overflow: hidden;
      padding: clamp(30px, 6vw, 68px);
      border-radius: 24px;
      color: #fff;
      background: radial-gradient(circle at 88% 12%, rgba(130, 219, 244, .34), transparent 28%), linear-gradient(125deg, #123653 0%, #176b91 58%, #79c4d8 130%);
      box-shadow: var(--shadow);
    }
    .hero::after { content: ""; position: absolute; right: -90px; bottom: -190px; width: 390px; height: 390px; border: 1px solid rgba(255,255,255,.23); border-radius: 50%; box-shadow: 0 0 0 28px rgba(255,255,255,.035), 0 0 0 58px rgba(255,255,255,.025); }
    .hero-inner { position: relative; z-index: 1; max-width: 840px; }
    .eyebrow { margin: 0 0 15px; color: #b9efff; font-size: .79rem; font-weight: 700; letter-spacing: .15em; text-transform: uppercase; }
    h1, h2, h3 { line-height: 1.25; }
    h1 { max-width: 850px; margin: 0; font-size: clamp(2rem, 5vw, 3.65rem); letter-spacing: -.035em; }
    .hero-lead { max-width: 760px; margin: 20px 0 24px; color: #e9f7fb; font-size: clamp(1.02rem, 2vw, 1.2rem); }
    .byline { display: flex; flex-wrap: wrap; gap: 10px 22px; color: #d9eef4; font-size: .9rem; }
    .article-card { margin-top: 24px; padding: clamp(22px, 5vw, 58px); border: 1px solid #e8eef2; border-radius: 22px; background: var(--paper); box-shadow: var(--shadow); }
    .article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 245px; gap: 42px; align-items: start; }
    .article-body { min-width: 0; }
    .article-body h2 { margin: 46px 0 14px; font-size: clamp(1.45rem, 3vw, 2rem); letter-spacing: -.02em; }
    .article-body h3 { margin: 27px 0 9px; font-size: 1.22rem; }
    .article-body p { margin: 0 0 16px; }
    .article-body ul, .article-body ol { padding-left: 1.25rem; }
    .article-body li { margin: 0 0 8px; }
    .quick-answer { margin-bottom: 26px; padding: 21px 23px; border-left: 4px solid var(--blue); border-radius: 0 13px 13px 0; background: var(--ice); }
    .quick-answer strong { display: block; margin-bottom: 5px; color: var(--blue-dark); }
    .quick-answer p { margin: 0; }
    .toc { margin: 0 0 34px; padding: 20px 23px; border: 1px solid var(--line); border-radius: 14px; background: var(--soft); }
    .toc h2 { margin: 0 0 10px; font-size: 1.05rem; }
    .toc ol { margin: 0; padding-left: 1.25rem; }
    .toc li { margin: 5px 0; }
    .toc a { color: var(--ink); text-decoration: none; }
    .toc a:hover { color: var(--blue); text-decoration: underline; }
    .side-note { position: sticky; top: 20px; padding: 20px; border-radius: 15px; background: #f4f9fb; }
    .side-note h2 { margin: 0 0 10px; font-size: 1.03rem; }
    .side-note p { margin: 0; color: var(--muted); font-size: .93rem; }
    .compare-wrap { overflow-x: auto; margin: 20px 0 24px; border: 1px solid var(--line); border-radius: 14px; }
    .compare-table { width: 100%; min-width: 650px; border-collapse: collapse; background: #fff; }
    .compare-table th, .compare-table td { padding: 15px 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
    .compare-table thead th { color: #fff; background: var(--blue-dark); font-size: .95rem; }
    .compare-table tbody th { width: 22%; background: #f4f9fb; }
    .compare-table tr:last-child th, .compare-table tr:last-child td { border-bottom: 0; }
    .note { padding: 17px 19px; border: 1px solid #f0dfb8; border-radius: 12px; background: #fffaf0; color: #57482c; }
    .study-card { margin: 20px 0; padding: 22px; border: 1px solid var(--line); border-radius: 15px; background: linear-gradient(145deg, #f6fbfd, #fff); }
    .study-card p:last-child { margin-bottom: 0; }
    .checklist { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 20px 0; padding: 0; list-style: none; }
    .checklist li { margin: 0; padding: 15px 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--soft); }
    .checklist strong { display: block; margin-bottom: 4px; color: var(--blue-dark); }
    .product-box { display: grid; grid-template-columns: minmax(210px, .8fr) 1.2fr; gap: 24px; align-items: center; margin: 34px 0; padding: 22px; border: 1px solid #dceaf0; border-radius: 18px; background: linear-gradient(135deg, #f2faff, #fff 75%); }
    .product-box img { display: block; width: 100%; max-height: 320px; object-fit: contain; border-radius: 12px; background: #fff; }
    .product-box h2 { margin: 5px 0 10px; font-size: 1.55rem; }
    .product-box p { margin-bottom: 12px; }
    .product-kicker { color: var(--blue); font-size: .8rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
    .spec-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 15px 0 18px; }
    .spec-chips span { padding: 6px 10px; border: 1px solid #d7e8ef; border-radius: 999px; color: #28536d; background: #fff; font-size: .83rem; }
    .button-link { display: inline-block; padding: 12px 18px; border-radius: 8px; color: #fff; background: var(--blue-dark); font-weight: 700; text-decoration: none; }
    .button-link:hover { color: #fff; background: #0b5f87; }
    .faq-item { margin: 0 0 18px; }
    .faq-item h3 { margin: 0 0 6px; }
    .faq-item p { margin: 0; }
    .references { margin-top: 42px; padding-top: 23px; border-top: 1px solid var(--line); color: var(--muted); font-size: .92rem; }
    .references h2 { margin-top: 0; font-size: 1.15rem; }
    .references li { margin-bottom: 9px; }
    .disclaimer { margin-top: 24px; padding: 17px 19px; border-radius: 12px; background: #f3f6f8; color: var(--muted); font-size: .9rem; }
    .article-footer { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }
    @media (max-width: 820px) {
      .article-grid { grid-template-columns: 1fr; }
      .side-note { position: static; }
    }
    @media (max-width: 620px) {
      .page-wrap { width: min(100% - 20px, 1120px); padding-top: 12px; }
      .hero, .article-card { border-radius: 16px; }
      .checklist, .product-box { grid-template-columns: 1fr; }
      .product-box img { max-height: 260px; }
    }
    @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }