:root{
      --ink:#0b0b0b;
      --paper:#f7f6f2;
      --white:#fff;
      --muted:#66635e;
      --line:#d7d4cc;
      --soft:#ebe8e0;
      --red:#c91d2e;
      --red-dark:#941221;
      --ok:#146b48;
      --warn:#a45a00;
      --radius:2px;
      --shadow:0 18px 50px rgba(0,0,0,.08);
      --max:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth;scroll-padding-top:24px}
    body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Yu Gothic UI","Yu Gothic",Meiryo,sans-serif;line-height:1.85;letter-spacing:.015em}
    body.no-scroll{overflow:hidden}
    a{color:inherit;text-decoration-thickness:1px;text-underline-offset:.2em}
    button,input{font:inherit}
    button{cursor:pointer}
    .skip-link{position:absolute;left:12px;top:-70px;background:var(--ink);color:#fff;padding:10px 14px;z-index:1000}
    .skip-link:focus{top:12px}
    .progress{position:fixed;inset:0 0 auto 0;height:4px;background:transparent;z-index:999}
    .progress span{display:block;height:100%;width:0;background:var(--red)}
    .site-header{background:var(--ink);color:#fff;border-bottom:1px solid #333}
    .header-inner{max-width:var(--max);margin:auto;padding:18px 24px;display:flex;align-items:center;gap:28px}
    .brand{display:flex;align-items:baseline;gap:10px;text-decoration:none;white-space:nowrap}
    .brand strong{font-size:1.35rem;letter-spacing:.12em}
    .brand small{color:#b8b8b8;font-size:.62rem;letter-spacing:.18em}
    .global-nav{display:flex;gap:20px;align-items:center;margin-left:auto;font-size:.83rem}
    .global-nav a{text-decoration:none;color:#ddd}
    .global-nav a:hover,.global-nav a:focus-visible{color:#fff;text-decoration:underline}
    .external{border-left:1px solid #555;padding-left:20px}
    .menu-btn{display:none;margin-left:auto;border:1px solid #555;background:#111;color:#fff;padding:8px 12px}
    .hero{background:var(--ink);color:#fff;position:relative;overflow:hidden}
    .hero:after{content:"";position:absolute;right:-120px;bottom:-160px;width:420px;height:420px;border:72px solid rgba(201,29,46,.2);border-radius:50%}
    .hero-inner{max-width:var(--max);margin:auto;padding:84px 24px 72px;position:relative;z-index:1}
    .eyebrow{font-size:.75rem;letter-spacing:.2em;text-transform:uppercase;color:#c8c8c8;margin:0 0 18px}
    h1{font-size:clamp(2.45rem,7vw,5.6rem);line-height:1.02;letter-spacing:-.045em;margin:0;max-width:930px}
    .hero-sub{font-size:clamp(1.05rem,2vw,1.35rem);max-width:820px;margin:28px 0 0;color:#dedede;line-height:1.8}
    .hero-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:30px}
    .chip{display:inline-flex;align-items:center;border:1px solid #555;padding:6px 10px;font-size:.72rem;letter-spacing:.05em;color:#eee}
    .hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:34px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 16px;border:1px solid var(--ink);background:var(--ink);color:#fff;text-decoration:none;font-weight:700;font-size:.84rem}
    .btn:hover,.btn:focus-visible{background:var(--red);border-color:var(--red)}
    .btn-light{background:#fff;color:#111;border-color:#fff}
    .btn-light:hover,.btn-light:focus-visible{background:var(--red);color:#fff}
    .btn-outline-light{background:transparent;border-color:#777;color:#fff}
    .btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
    .btn-ghost:hover,.btn-ghost:focus-visible{background:var(--ink);color:#fff;border-color:var(--ink)}
    .intro-strip{background:#fff;border-bottom:1px solid var(--line)}
    .intro-inner{max-width:var(--max);margin:auto;padding:34px 24px;display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:center}
    .intro-lead{font-size:clamp(1.4rem,3vw,2.25rem);font-weight:800;line-height:1.45;margin:0}
    .intro-copy{margin:0;color:#444}
    .page-grid{max-width:var(--max);margin:auto;padding:58px 24px 100px;display:grid;grid-template-columns:250px minmax(0,1fr);gap:56px;align-items:start}
    .toc{position:sticky;top:24px;border-top:5px solid var(--ink);background:#fff;padding:20px;border-bottom:1px solid var(--line)}
    .toc h2{font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;margin:0 0 14px}
    .toc ol{list-style:none;padding:0;margin:0}
    .toc li+li{border-top:1px solid var(--soft)}
    .toc a{display:block;padding:9px 0;text-decoration:none;font-size:.78rem;line-height:1.45;color:#4d4a46}
    .toc a:hover,.toc a:focus-visible,.toc a.active{color:var(--red);font-weight:800}
    .toc-tools{display:grid;gap:8px;margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}
    .toc-tools button{font-size:.72rem;padding:8px;background:#fff;border:1px solid var(--line);text-align:left}
    .guide-content{min-width:0}
    .section{padding:0 0 76px;border-bottom:1px solid var(--line);margin-bottom:74px}
    .section:last-of-type{border-bottom:0}
    .section-label{display:flex;align-items:center;gap:12px;margin-bottom:14px;font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;font-weight:800}
    .section-label:before{content:"";width:34px;height:4px;background:var(--red)}
    h2{font-size:clamp(2rem,5vw,3.75rem);line-height:1.15;letter-spacing:-.035em;margin:0 0 24px}
    h3{font-size:clamp(1.28rem,2.8vw,2rem);line-height:1.4;margin:46px 0 16px;letter-spacing:-.02em}
    h4{font-size:1.06rem;margin:28px 0 10px}
    p{margin:0 0 1.15em}
    .lead{font-size:1.12rem;color:#35322f;max-width:780px}
    .core-message{background:var(--ink);color:#fff;padding:30px 32px;margin:34px 0;border-left:7px solid var(--red)}
    .core-message small{display:block;color:#aaa;letter-spacing:.16em;text-transform:uppercase;font-weight:800;margin-bottom:8px}
    .core-message strong{font-size:clamp(1.25rem,3vw,2rem);line-height:1.55}
    .note,.warning,.privacy{padding:20px 22px;margin:26px 0;border-left:5px solid var(--ink);background:#fff}
    .warning{border-color:var(--warn);background:#fff9ef}
    .privacy{border-color:var(--red);background:#fff5f5}
    .note strong,.warning strong,.privacy strong{display:block;margin-bottom:4px}
    .cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:24px 0}
    .card{background:#fff;border:1px solid var(--line);padding:24px;min-width:0}
    .card .tag{display:inline-block;font-size:.64rem;letter-spacing:.15em;text-transform:uppercase;color:var(--red);font-weight:900;margin-bottom:10px}
    .card h3,.card h4{margin:0 0 10px}
    .card p:last-child{margin-bottom:0}
    .metric-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:24px 0}
    .metric{background:#fff;border-top:4px solid var(--ink);padding:18px 16px;min-height:130px}
    .metric strong{display:block;font-size:1.06rem;line-height:1.35}
    .metric span{display:block;color:var(--muted);font-size:.76rem;margin-top:8px}
    .formula{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;background:#fff;border:1px solid var(--line);padding:22px;margin:22px 0;text-align:center;font-size:clamp(.95rem,2vw,1.2rem);font-weight:800;overflow:auto}
    ul.clean{padding-left:1.2em}
    ul.clean li{margin:.35em 0}
    .steps{counter-reset:step;display:grid;gap:12px;margin:24px 0}
    .step{counter-increment:step;display:grid;grid-template-columns:52px 1fr;background:#fff;border:1px solid var(--line)}
    .step:before{content:counter(step,decimal-leading-zero);display:flex;align-items:center;justify-content:center;background:var(--ink);color:#fff;font-weight:900;font-size:.8rem;letter-spacing:.08em}
    .step div{padding:18px 20px}
    .step strong{display:block;margin-bottom:4px}
    .interactive{background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);margin:34px 0;padding:28px}
    .interactive-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;margin-bottom:20px}
    .interactive-head h3{margin:0}
    .interactive-head p{margin:5px 0 0;color:var(--muted);font-size:.86rem}
    .choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
    .choice{border:1px solid var(--line);background:#fff;text-align:left;padding:16px;min-height:82px;font-weight:800}
    .choice small{display:block;color:var(--muted);font-weight:400;margin-top:4px}
    .choice:hover,.choice:focus-visible,.choice.selected{border-color:var(--red);box-shadow:inset 5px 0 0 var(--red)}
    .recommendation{margin-top:18px;background:var(--paper);padding:20px;border-left:5px solid var(--red);min-height:90px}
    .recommendation h4{margin:0 0 6px}
    .recommendation a{font-weight:800;color:var(--red)}
    .calc-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    label.field{display:grid;gap:6px;font-weight:800;font-size:.82rem}
    label.field input{width:100%;padding:12px;border:1px solid var(--line);background:#fff;color:var(--ink)}
    label.field input:focus{outline:3px solid rgba(201,29,46,.18);border-color:var(--red)}
    .calc-actions{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}
    .calc-results{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
    .calc-result{background:var(--ink);color:#fff;padding:18px}
    .calc-result span{display:block;color:#aaa;font-size:.7rem;letter-spacing:.1em;text-transform:uppercase}
    .calc-result strong{display:block;font-size:1.35rem;margin-top:5px}
    .tabs{margin:28px 0}
    .tab-list{display:flex;flex-wrap:wrap;border-bottom:1px solid var(--line)}
    .tab-list button{border:0;border-top:3px solid transparent;background:transparent;padding:12px 16px;font-weight:800;color:#5d5954}
    .tab-list button[aria-selected="true"]{border-top-color:var(--red);background:#fff;color:var(--ink)}
    .tab-panel{display:none;background:#fff;padding:24px;border:1px solid var(--line);border-top:0}
    .tab-panel.active{display:block}
    .analysis-table-wrap{overflow:auto;border:1px solid var(--line);background:#fff;margin:24px 0}
    table{width:100%;border-collapse:collapse;min-width:740px}
    th,td{text-align:left;vertical-align:top;border-bottom:1px solid var(--line);padding:14px 16px}
    th{background:var(--ink);color:#fff;font-size:.75rem;letter-spacing:.05em}
    td{font-size:.86rem}
    tr:last-child td{border-bottom:0}
    .know-more{margin:24px 0;border:1px solid var(--line);background:#fff}
    .know-more summary{list-style:none;cursor:pointer;padding:18px 54px 18px 20px;font-weight:900;position:relative}
    .know-more summary::-webkit-details-marker{display:none}
    .know-more summary:after{content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);font-size:1.5rem;color:var(--red)}
    .know-more[open] summary:after{content:"−"}
    .know-more[open] summary{border-bottom:1px solid var(--line)}
    .know-content{padding:20px}
    .resource-list{display:grid;gap:10px}
    .resource{display:grid;grid-template-columns:96px 1fr auto;gap:14px;align-items:center;border:1px solid var(--soft);padding:14px;text-decoration:none}
    .resource:hover,.resource:focus-visible{border-color:var(--red);background:#fffafa}
    .resource-type{font-size:.64rem;font-weight:900;letter-spacing:.09em;text-transform:uppercase;color:var(--red)}
    .resource strong{display:block;line-height:1.35}
    .resource small{display:block;color:var(--muted);margin-top:3px}
    .resource-arrow{font-size:1.1rem}
    .source-filter{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}
    .source-filter button{padding:8px 12px;border:1px solid var(--line);background:#fff;font-weight:800;font-size:.76rem}
    .source-filter button.active{background:var(--ink);color:#fff;border-color:var(--ink)}
    .source-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .source-card{background:#fff;border:1px solid var(--line);padding:18px;display:flex;flex-direction:column;gap:8px;min-height:170px}
    .source-card.hidden{display:none}
    .source-card .source-kind{font-size:.63rem;letter-spacing:.12em;text-transform:uppercase;color:var(--red);font-weight:900}
    .source-card h4{margin:0;line-height:1.45}
    .source-card p{font-size:.82rem;color:var(--muted);margin:0}
    .source-card a{margin-top:auto;font-weight:800;color:var(--red)}
    .checklist{display:grid;gap:10px;margin:20px 0}
    .check-item{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:start;background:#fff;border:1px solid var(--line);padding:15px}
    .check-item input{width:20px;height:20px;margin-top:3px;accent-color:var(--red)}
    .check-item strong{display:block}
    .check-item small{display:block;color:var(--muted);margin-top:2px}
    .check-status{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:14px}
    .check-count{font-size:2rem;font-weight:900}
    .check-bar{height:10px;background:var(--soft);flex:1;min-width:180px}
    .check-bar span{display:block;height:100%;width:0;background:var(--red);transition:width .2s ease}
    .check-actions{display:flex;flex-wrap:wrap;gap:8px}
    .flow{display:grid;grid-template-columns:repeat(6,1fr);gap:4px;margin:28px 0}
    .flow div{background:var(--ink);color:#fff;min-height:126px;padding:14px;display:flex;flex-direction:column;justify-content:space-between}
    .flow span{font-size:.62rem;color:#aaa;letter-spacing:.1em}
    .flow strong{line-height:1.4}
    .supplement{background:#111;color:#fff;padding:42px;margin:30px 0}
    .supplement h3{margin-top:0}
    .causal-chain{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:24px 0}
    .causal-chain span{border:1px solid #555;padding:10px 12px;background:#171717}
    .causal-chain b{color:var(--red);font-size:1.25rem}
    .final-quote{font-size:clamp(1.35rem,3vw,2.35rem);font-weight:900;line-height:1.55;border-top:7px solid var(--red);padding-top:26px;margin-top:34px}
    .contact-panel{background:var(--red);color:#fff;padding:42px;margin-top:30px;display:grid;grid-template-columns:1.2fr auto;gap:30px;align-items:center}
    .contact-panel h2{font-size:clamp(1.8rem,4vw,3.2rem);margin:0 0 10px}
    .contact-panel p{margin:0;color:#ffe7ea}
    .contact-panel .btn{background:#fff;color:#111;border-color:#fff}
    .site-footer{background:var(--ink);color:#ddd}
    .footer-inner{max-width:var(--max);margin:auto;padding:48px 24px;display:grid;grid-template-columns:1.3fr repeat(3,1fr);gap:34px}
    .footer-brand strong{font-size:1.5rem;letter-spacing:.1em;color:#fff}
    .footer-brand p{font-size:.82rem;color:#aaa}
    .footer-col strong{display:block;font-size:.68rem;letter-spacing:.15em;color:#888;margin-bottom:12px}
    .footer-col a{display:block;text-decoration:none;font-size:.82rem;margin:7px 0;color:#ccc}
    .copyright{max-width:var(--max);margin:auto;padding:18px 24px;border-top:1px solid #333;color:#777;font-size:.72rem}
    .back-top{position:fixed;right:18px;bottom:18px;width:46px;height:46px;border:0;background:var(--ink);color:#fff;display:none;z-index:50;font-weight:900}
    .back-top.show{display:block}
    .back-top:hover,.back-top:focus-visible{background:var(--red)}
    .mobile-toc-btn{display:none;width:100%;border:1px solid var(--line);background:#fff;padding:12px 14px;font-weight:800;text-align:left;margin-bottom:20px}
    .noscript{background:#fff4d5;border:1px solid #e4c265;padding:14px;max-width:var(--max);margin:12px auto}
    :focus-visible{outline:3px solid rgba(201,29,46,.35);outline-offset:3px}
    @media (max-width:980px){
      .global-nav{display:none;position:absolute;left:0;right:0;top:67px;background:#111;padding:20px 24px;flex-direction:column;align-items:flex-start;z-index:30;border-top:1px solid #444}
      .global-nav.open{display:flex}.external{border:0;padding-left:0}.menu-btn{display:block}
      .intro-inner{grid-template-columns:1fr;gap:16px}
      .page-grid{grid-template-columns:1fr;padding-top:32px}.toc{display:none;position:static}.toc.open{display:block;margin-bottom:28px}.mobile-toc-btn{display:block}
      .metric-grid{grid-template-columns:repeat(2,1fr)}
      .flow{grid-template-columns:repeat(3,1fr)}
      .footer-inner{grid-template-columns:1fr 1fr}
    }
    @media (max-width:680px){
      .header-inner{padding:15px 16px}.brand small{display:none}
      .hero-inner{padding:60px 18px}.hero-sub{font-size:1rem}
      .page-grid{padding:30px 16px 70px}.section{padding-bottom:54px;margin-bottom:52px}
      .cards,.choice-grid,.calc-grid,.calc-results,.source-grid{grid-template-columns:1fr}
      .metric-grid{grid-template-columns:1fr 1fr}.metric{min-height:auto}
      .interactive{padding:20px;margin-left:-4px;margin-right:-4px}.interactive-head{display:block}
      .resource{grid-template-columns:1fr auto}.resource-type{grid-column:1/-1}.resource-arrow{grid-column:2;grid-row:2}
      .flow{grid-template-columns:1fr 1fr}.flow div{min-height:104px}
      .supplement{padding:26px 20px}.contact-panel{grid-template-columns:1fr;padding:30px 22px}
      .footer-inner{grid-template-columns:1fr}.global-nav{top:61px}
    }
    @media print{
      @page{size:A4;margin:14mm}
      body{background:#fff;font-size:10.5pt;line-height:1.6}
      .progress,.site-header,.hero-actions,.toc,.mobile-toc-btn,.back-top,.interactive .choice-grid,.calc-actions,.check-actions,.source-filter,.contact-panel,.site-footer{display:none!important}
      .hero{background:#fff!important;color:#000!important;border-bottom:3px solid #000}.hero:after{display:none}.hero-inner{padding:0 0 18px}.hero-sub,.eyebrow{color:#333}
      .page-grid{display:block;max-width:none;padding:18px 0}.section{break-inside:auto;padding-bottom:24px;margin-bottom:28px}.card,.metric,.interactive,.know-more,.source-card,.note,.warning,.privacy{box-shadow:none;break-inside:avoid}
      details{display:block}.know-content{display:block!important}.know-more summary:after{display:none}
      a{text-decoration:none}.resource-arrow{display:none}
      body.print-checklist .hero,body.print-checklist .intro-strip,body.print-checklist .guide-content>section:not(#checklist-section),body.print-checklist .mobile-toc-btn{display:none!important}
      body.print-checklist #checklist-section{display:block!important;border:0;margin:0;padding:0}
      body.print-checklist #checklist-section .section-label,body.print-checklist #checklist-section>p,body.print-checklist #checklist-section .check-actions{display:none!important}
      body.print-calculator .hero,body.print-calculator .intro-strip,body.print-calculator .guide-content>section:not(#basic-analysis),body.print-calculator .mobile-toc-btn{display:none!important}
      body.print-calculator #basic-analysis{display:block!important;border:0;margin:0;padding:0}
      body.print-calculator #basic-analysis>*:not(#calculator){display:none!important}
      body.print-calculator #calculator{display:block!important;border:0;box-shadow:none;margin:0;padding:0}
      body.print-calculator #calculator .interactive-head p,body.print-calculator #calculator .calc-actions,body.print-calculator #calculator .warning{display:none!important}
      body.print-calculator #calculator .calc-grid,body.print-calculator #calculator .calc-results{display:grid!important}
      body.print-calculator #calculator input{border:1px solid #999!important;background:#fff!important;color:#000!important}
    }
  

/* CIVIO integration */
.data-analysis-guide{background:var(--paper)}
.data-analysis-guide .hero{margin:0}
.data-analysis-guide .page-grid{padding-top:58px}
.data-analysis-guide .sample-note{font-size:.78rem;color:var(--muted);margin:12px 0 0}
.data-analysis-guide .confidentiality-note{margin-top:24px;border:1px solid var(--line);background:#fff;padding:18px 20px;font-size:.84rem;color:#4c4945}
.data-analysis-guide .print-specific{white-space:nowrap}
@media(max-width:800px){.data-analysis-guide .page-grid{padding-top:32px}}

/* Keep light action labels visible after the shared CIVIO link color rule. */
.data-analysis-guide a.btn-light,.data-analysis-guide .contact-panel a.btn{color:#111!important}
.data-analysis-guide a.btn-light:hover,.data-analysis-guide .contact-panel a.btn:hover{color:#fff!important}