:root{--orange:#f48000;--ink:#202020;--muted:#6b6b65;--line:#e4e4df;--paper:#fafafa;--soft:#f0efeb}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth;scroll-padding-top:28px}
    body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;-webkit-font-smoothing:antialiased}
    button,a,summary{-webkit-tap-highlight-color:transparent}
    button{font:inherit;cursor:pointer}
    a{color:inherit;text-underline-offset:4px}
    a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:5px}
    .page{max-width:1216px;margin:0 auto;padding:0 40px 60px}
    .reading{max-width:790px;margin-left:auto;margin-right:auto}
    .hero{padding-top:62px}
    .eyebrow{display:flex;align-items:center;gap:10px;font-size:10px;font-weight:700;letter-spacing:2px;text-transform:uppercase}
    .eyebrow::before{content:"";width:22px;height:3px;background:var(--orange);flex-shrink:0}
    h1{max-width:1000px;margin:23px auto 30px;font-size:clamp(38px,4.7vw,62px);line-height:1.08;letter-spacing:-2px;font-weight:700;text-wrap:pretty}
    .hero-inner{max-width:790px;margin:auto}
    .intro{font-size:19px;line-height:1.8;color:#55554f;margin:0}
    .contents{margin-top:30px;padding:7px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
    .contents summary{display:flex;align-items:center;justify-content:space-between;min-height:45px;font-size:12px;font-weight:700;list-style:none;cursor:pointer}
    .contents summary::-webkit-details-marker{display:none}
    .contents summary::after{content:"+";font-size:23px;color:#a6600d;font-weight:400}
    .contents[open] summary::after{content:"−"}
    .contents nav{display:grid;grid-template-columns:1fr 1fr;column-gap:24px;row-gap:2px;padding:2px 0 12px}
    .contents a{display:flex;align-items:center;min-height:38px;text-decoration:none;font-size:12px;line-height:1.5;color:var(--muted)}
    .contents a:hover{color:#9a5300}
    .section{padding-top:39px;padding-bottom:36px;border-bottom:1px solid var(--line);font-size:17px;line-height:1.85}
    h2{display:flex;align-items:baseline;gap:15px;margin:0 0 19px;font-size:29px;line-height:1.25;letter-spacing:-.7px;overflow-wrap:break-word}
    .number{flex-shrink:0;min-width:20px;color:#aa6312;font-size:12px;font-weight:500;letter-spacing:0}
    p{margin:0 0 18px}
    p:last-child{margin-bottom:0}
    strong{font-weight:700}
    .section ul{padding-left:21px;margin:18px 0}
    .section li{padding-left:4px;margin-bottom:8px}
    .section li::marker{color:var(--orange)}
    .illustration{max-width:790px;margin:31px auto 0}
    .banner{margin:0 0 28px}
    .image-button{display:block;width:100%;padding:0;border:1px solid var(--line);background:#fff;cursor:zoom-in;touch-action:manipulation}
    .image-button img{display:block;width:100%;max-width:100%;height:auto;object-fit:contain}
    .image-caption{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:3px;font-size:11px;color:var(--muted);line-height:1.6}
    .image-caption span{display:flex;align-items:center;gap:8px}
    .image-caption span::before{content:"";width:14px;height:2px;background:var(--orange);flex-shrink:0}
    .enlarge{min-height:44px;border:0;background:none;padding:9px 0;font-size:11px;color:#955000;white-space:nowrap}
    .finish-list{display:grid;grid-template-columns:1fr 1fr;gap:24px;padding:0!important;margin:22px 0!important;list-style:none}
    .finish-list li{padding:16px 0 0!important;border-top:1px solid var(--line);margin:0!important}
    .finish-list strong{display:block;margin-bottom:3px;font-size:15px}
    .finish-list span{display:block;font-size:15px;line-height:1.75;color:#60605a}
    .calculation{margin:22px 0;padding:20px 23px;border-left:3px solid var(--orange);background:#fff;font-size:16px;line-height:1.8}
    .note{margin-top:22px;padding:20px 23px;background:var(--soft);font-size:15px;line-height:1.8}
    .checklist{list-style:none;padding:0!important;margin:20px 0!important}
    .checklist li{position:relative;padding:12px 0 12px 26px!important;margin:0;border-bottom:1px solid var(--line);font-size:16px;line-height:1.7}
    .checklist li::before{content:"";position:absolute;left:1px;top:22px;width:7px;height:7px;border:1px solid #ac661a}
    .section-last{border-bottom:0;padding-bottom:26px}
    .cta{margin-top:7px;padding:29px 32px;background:#20201e;color:#fff;border-radius:4px;font-size:16px;line-height:1.8}
    .cta strong{display:block;margin-bottom:9px;font-size:24px;line-height:1.3;letter-spacing:-.4px}
    .cta p{color:#d6d6ce}
    .sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
    dialog{border:0;padding:0;background:transparent;color:#fff;width:min(96vw,1800px);max-width:96vw;max-height:94vh}
    dialog::backdrop{background:rgba(0,0,0,.88)}
    .viewer-bar{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:8px 2px;font-size:13px;line-height:1.5}
    .viewer-bar button{flex-shrink:0;min-height:44px;padding:8px 15px;border:1px solid #777;border-radius:3px;background:#222;color:#fff;font-size:12px}
    .viewer-scroll{max-height:80vh;overflow:auto;background:#fff;overscroll-behavior:contain;-webkit-overflow-scrolling:touch}
    .viewer-scroll img{display:block;width:100%;height:auto;min-width:1100px}
    @media(max-width:900px){.page{padding-left:28px;padding-right:28px}h1{font-size:48px}.hero{padding-top:42px}}
    @media(max-width:650px){
      html{scroll-padding-top:20px}
      .page{padding:0 20px 35px}
      .hero{padding-top:30px}
      .eyebrow{font-size:9px;letter-spacing:1.5px}
      h1{font-size:clamp(30px,8.3vw,38px);line-height:1.14;letter-spacing:-1px;margin:18px 0 22px}
      .intro{font-size:16px;line-height:1.8}
      .contents{margin-top:23px}
      .contents summary{font-size:13px}
      .contents nav{column-gap:16px;padding-bottom:10px}
      .contents a{font-size:11px;min-height:44px}
      .section{padding-top:28px;padding-bottom:27px;font-size:16px;line-height:1.8}
      h2{gap:10px;margin-bottom:17px;font-size:23px;line-height:1.3;letter-spacing:-.4px}
      .number{font-size:11px;min-width:17px}
      p{margin-bottom:17px}
      .illustration{margin-top:24px}
      .banner{margin-bottom:23px}
      .image-caption{gap:10px;font-size:10px;align-items:flex-start}
      .image-caption span{padding-top:12px;font-size:10px;line-height:1.5;gap:6px}
      .enlarge{font-size:11px;min-height:44px}
      .finish-list{gap:18px;margin:19px 0!important}
      .finish-list li{padding-top:13px!important}
      .finish-list strong{font-size:14px}
      .finish-list span{font-size:14px;line-height:1.7}
      .calculation{padding:17px 18px;margin:20px 0;font-size:15px;line-height:1.8}
      .note{padding:17px 18px;font-size:14px;line-height:1.8;margin-top:20px}
      .section ul{padding-left:19px}
      .checklist li{font-size:15px;padding-top:11px!important;padding-bottom:11px!important}
      .section-last{padding-bottom:22px}
      .cta{padding:24px 22px;font-size:14px;line-height:1.8}
      .cta strong{font-size:23px;line-height:1.3}
      dialog{max-height:94dvh}
      .viewer-bar{font-size:11px;gap:12px}
      .viewer-scroll{max-height:78dvh}
    }
    @media(max-width:370px){.page{padding-left:16px;padding-right:16px}.contents nav{grid-template-columns:1fr}.image-caption{flex-wrap:wrap;gap:0}.image-caption span{flex-basis:100%}.cta{padding:22px 18px}.cta strong{font-size:21px}}
    @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
    @media print{body{background:#fff}.page{padding:0;max-width:none}.hero{padding-top:0}h1{font-size:36px}.contents,.enlarge{display:none}.section{font-size:12pt}.reading{max-width:none}h2{break-after:avoid}.image-button{border:0}.cta{background:#eee;color:#111}.cta p{color:#111}}