:root {
      --ink: #142337;
      --muted: #617083;
      --blue: #2468d7;
      --cyan: #39c5d7;
      --lavender: #eeeaff;
      --ice: #f5f9fd;
      --line: #dbe5ee;
      --white: #ffffff;
      --shadow: 0 18px 50px rgba(20, 45, 78, .10);
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: #f7fafc;
      font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      line-height: 1.7;
    }
    a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }
    .topline { background: var(--ink); color: #d9e8fb; font-size: 12px; letter-spacing: .12em; text-transform: uppercase; padding: 10px 5vw; }
    .shell { max-width: 1180px; margin: auto; padding: 0 24px; }
    .masthead { display: flex; align-items: center; justify-content: space-between; padding: 24px 0; }
    .brand { color: var(--ink); text-decoration: none; font-weight: 800; letter-spacing: .08em; font-size: 19px; }
    .brand span { color: var(--cyan); }
    .mini-link { font-size: 14px; font-weight: 700; text-decoration: none; }
    .hero {
      display: grid; grid-template-columns: 1.08fr .92fr; gap: 42px; align-items: center;
      padding: 58px 0 62px;
    }
    .eyebrow { color: var(--blue); font-weight: 800; font-size: 12px; letter-spacing: .16em; text-transform: uppercase; }
    h1 { font-size: clamp(38px, 5vw, 68px); line-height: 1.03; letter-spacing: -.045em; margin: 16px 0 22px; max-width: 700px; }
    .hero p { font-size: 19px; color: var(--muted); max-width: 620px; margin: 0 0 28px; }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
    .button { display: inline-flex; justify-content: center; align-items: center; border-radius: 999px; padding: 13px 20px; font-weight: 800; text-decoration: none; }
    .button.primary { background: var(--blue); color: white; box-shadow: 0 12px 24px rgba(36,104,215,.22); }
    .button.secondary { border: 1px solid var(--line); color: var(--ink); background: white; }
    .hero-visual { position: relative; min-height: 430px; border-radius: 34px; background: linear-gradient(145deg, #e9f8ff, #e8e2ff 58%, #fff); overflow: hidden; box-shadow: var(--shadow); }
    .hero-visual::before, .hero-visual::after { content: ""; position: absolute; border-radius: 50%; filter: blur(2px); }
    .hero-visual::before { width: 280px; height: 280px; background: rgba(57,197,215,.24); top: -70px; right: -50px; }
    .hero-visual::after { width: 210px; height: 210px; background: rgba(114,94,232,.20); bottom: -80px; left: -50px; }
    .replace-image { position: relative; z-index: 2; width: 100%; height: 430px; object-fit: contain; padding: 26px; }
    .image-note { position: absolute; z-index: 3; left: 22px; bottom: 18px; background: rgba(255,255,255,.84); border: 1px solid rgba(255,255,255,.9); border-radius: 12px; padding: 7px 12px; color: var(--muted); font-size: 11px; }
    .intro-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; margin: 0 0 54px; }
    .stat { background: white; border: 1px solid var(--line); border-radius: 18px; padding: 24px; }
    .stat strong { display: block; color: var(--blue); font-size: 25px; letter-spacing: -.03em; }
    .stat span { color: var(--muted); font-size: 14px; }
    .article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 290px; gap: 42px; align-items: start; }
    article { background: white; border: 1px solid var(--line); border-radius: 28px; padding: clamp(24px, 4vw, 58px); box-shadow: var(--shadow); }
    article h2 { font-size: clamp(27px, 3vw, 39px); line-height: 1.15; letter-spacing: -.035em; margin: 48px 0 16px; }
    article h2:first-child { margin-top: 0; }
    article h3 { font-size: 21px; margin: 30px 0 8px; }
    article p, article li { color: #44566c; }
    article ul { padding-left: 22px; }
    .lead { font-size: 20px; color: var(--ink); line-height: 1.6; }
    .evidence { margin: 28px 0; padding: 20px 22px; border-left: 4px solid var(--cyan); background: var(--ice); border-radius: 0 16px 16px 0; }
    .evidence strong { color: var(--ink); }
    .application-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; margin: 24px 0; }
    .application { border: 1px solid var(--line); padding: 20px; border-radius: 18px; background: linear-gradient(180deg, #fff, #f8fbff); }
    .application b { display: block; color: var(--blue); margin-bottom: 5px; }
    .application p { margin: 0; font-size: 14px; }
    .steps { counter-reset: step; display: grid; gap: 12px; margin-top: 24px; }
    .step { counter-increment: step; display: grid; grid-template-columns: 52px 1fr; gap: 16px; padding: 20px; border: 1px solid var(--line); border-radius: 16px; }
    .step::before { content: counter(step, decimal-leading-zero); color: white; background: var(--blue); border-radius: 13px; width: 44px; height: 44px; display: grid; place-items: center; font-weight: 900; }
    .step h3 { margin: 0 0 5px; font-size: 18px; }
    .step p { margin: 0; font-size: 15px; }
    .spec-table { width: 100%; border-collapse: collapse; margin: 22px 0; font-size: 15px; }
    .spec-table th, .spec-table td { text-align: left; padding: 13px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
    .spec-table th { width: 35%; color: var(--ink); background: #f7fbff; }
    .callout { padding: 28px; margin-top: 30px; border-radius: 22px; background: linear-gradient(135deg, #152b48, #256bd9); color: white; }
    .callout p { color: #e6f1ff; margin: 8px 0 18px; }
    .callout a { color: white; }
    .faq details { border-top: 1px solid var(--line); padding: 17px 0; }
    .faq summary { cursor: pointer; font-weight: 800; list-style: none; padding-right: 20px; position: relative; }
    .faq summary::-webkit-details-marker { display: none; }
    .faq summary::after { content: "+"; position: absolute; right: 0; color: var(--blue); }
    .faq details[open] summary::after { content: "−"; }
    .faq p { margin: 10px 0 0; font-size: 15px; }
    .sidebar { position: sticky; top: 18px; display: grid; gap: 16px; }
    .side-card { background: white; border: 1px solid var(--line); border-radius: 20px; padding: 22px; }
    .side-card h3 { margin: 0 0 12px; font-size: 16px; }
    .side-card ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 9px; }
    .side-card li a { text-decoration: none; color: var(--muted); font-size: 14px; }
    .side-card li a:hover { color: var(--blue); }
    .source-list { font-size: 13px; }
    .source-list li { margin-bottom: 7px; }
    footer { padding: 44px 0; color: var(--muted); font-size: 13px; }
    .disclaimer { background: #fff9e9; border: 1px solid #f2df9c; border-radius: 16px; padding: 17px 19px; font-size: 14px; color: #6a5925; margin-top: 24px; }
    @media (max-width: 860px) {
      .hero, .article-layout { grid-template-columns: 1fr; }
      .hero { padding-top: 30px; }
      .hero-visual { min-height: 320px; }
      .replace-image { height: 320px; }
      .sidebar { position: static; order: -1; grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 560px) {
      .shell { padding: 0 16px; }
      .masthead { padding: 18px 0; }
      .mini-link { font-size: 12px; }
      .intro-grid, .application-grid, .sidebar { grid-template-columns: 1fr; }
      article { border-radius: 20px; padding: 23px 19px; }
      .hero p { font-size: 17px; }
      .spec-table { font-size: 13px; }
    }
    @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }