:root{
  --bg:#F6F7F4;--bg-2:#EDF0EA;--card:#FFFFFF;--ink:#10130F;--ink-soft:#3C4239;--ink-faint:#6B7367;--ink-mute:#6B7367;
  --line:rgba(16,19,15,0.10);--line-soft:rgba(16,19,15,0.06);--green:#0B6E4F;--green-bright:#14B870;--lime:#9FE870;--night:#0C140F;
  --grad:linear-gradient(120deg,#0B6E4F 0%,#0FA890 52%,#14B870 100%);
  --serif:'Newsreader',Georgia,serif;--jp:'Noto Sans JP',sans-serif;--sans:'Inter','Noto Sans JP',sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;}
html{scroll-behavior:smooth;}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.75;letter-spacing:0.005em;overflow-x:hidden;}
::selection{background:var(--green);color:#fff;}
a{color:inherit;text-decoration:none;}
.wrap{max-width:760px;margin:0 auto;padding:0 48px;}
.eyebrow{font-size:11px;font-weight:700;letter-spacing:0.26em;text-transform:uppercase;color:var(--green);display:inline-flex;align-items:center;gap:14px;}
.eyebrow::before{content:"";width:30px;height:2px;background:var(--grad);border-radius:2px;}
.nav{position:sticky;top:0;z-index:100;display:flex;justify-content:space-between;align-items:center;padding:16px 48px;background:rgba(246,247,244,0.82);backdrop-filter:blur(18px) saturate(1.5);-webkit-backdrop-filter:blur(18px) saturate(1.5);border-bottom:1px solid var(--line-soft);}
.nav-brand{display:flex;align-items:center;gap:13px;color:var(--ink);min-width:0;}
.nav-mark{width:30px;height:30px;flex-shrink:0;}
.nav-name{display:flex;flex-direction:column;line-height:1.12;}
.nav-name .n-en{font-family:var(--sans);font-weight:800;font-size:15px;letter-spacing:-0.01em;white-space:nowrap;}
.nav-name .n-jp{font-family:var(--jp);font-size:9.5px;font-weight:500;color:var(--ink-faint);letter-spacing:0.12em;margin-top:2px;}
.nav-cta{font-size:12.5px;font-weight:700;letter-spacing:0.03em;padding:11px 22px;border-radius:99px;color:#fff;background:var(--ink);white-space:nowrap;transition:transform 0.35s,background 0.35s;}
.nav-cta:hover{transform:translateY(-2px);background:var(--green);}
.ahead{padding:72px 0 30px;}
.ahead .crumb{font-family:var(--sans);font-size:12.5px;font-weight:600;color:var(--ink-faint);margin-bottom:24px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;}
.ahead .crumb a:hover{color:var(--green);}
.ameta{display:flex;align-items:center;gap:16px;margin-bottom:20px;}
.ameta .cat{font-family:var(--sans);font-size:11px;font-weight:700;letter-spacing:0.14em;text-transform:uppercase;color:var(--green);}
.ameta .date{font-family:var(--sans);font-size:12.5px;font-weight:500;color:var(--ink-mute);letter-spacing:0.04em;}
.ahead h1{font-family:var(--jp);font-weight:900;font-size:clamp(28px,4.4vw,46px);line-height:1.42;letter-spacing:0.01em;color:var(--ink);}
.ahead .lead{font-family:var(--jp);font-size:17px;font-weight:500;line-height:2.1;color:var(--ink-soft);margin-top:26px;}
.ahead .lead strong{color:var(--ink);font-weight:700;}
.readmeta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:24px;padding-top:22px;border-top:1px solid var(--line);font-family:var(--sans);font-size:12.5px;font-weight:500;color:var(--ink-faint);}
.readmeta .author{font-weight:700;color:var(--ink-soft);}
.readmeta .dot{width:3px;height:3px;border-radius:50%;background:var(--ink-mute);}
.article{padding:8px 0 90px;}
.tldr{margin:18px 0 0;padding:28px 30px;background:var(--card);border:1px solid var(--line);border-left:3px solid var(--green);border-radius:0 14px 14px 0;}
.tldr .tl-h{font-family:var(--sans);font-size:11px;font-weight:800;letter-spacing:0.14em;text-transform:uppercase;color:var(--green);margin-bottom:16px;}
.tldr ul{list-style:none;margin:0;padding:0;}
.tldr li{font-family:var(--jp);font-size:15px;font-weight:500;line-height:1.85;color:var(--ink);padding:7px 0 7px 24px;position:relative;}
.tldr li::before{content:"";position:absolute;left:0;top:15px;width:8px;height:8px;border-radius:50%;background:var(--grad);}
.tldr li strong{font-weight:700;}
.toc{margin:30px 0 8px;padding:24px 28px;background:var(--bg-2);border-radius:14px;}
.toc .toc-h{font-family:var(--sans);font-size:11px;font-weight:800;letter-spacing:0.14em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:12px;}
.toc ol{margin:0;padding:0;list-style:none;counter-reset:toc;}
.toc li{counter-increment:toc;font-family:var(--jp);font-size:14.5px;font-weight:500;line-height:1.5;padding:9px 0;border-bottom:1px solid var(--line-soft);}
.toc li:last-child{border-bottom:none;}
.toc a{color:var(--ink-soft);display:inline-flex;align-items:baseline;transition:color 0.3s;}
.toc a:hover{color:var(--green);}
.toc a::before{content:counter(toc,decimal-leading-zero);font-family:var(--sans);font-style:italic;font-weight:800;color:var(--green);margin-right:12px;}
.article h2{font-family:var(--jp);font-weight:900;font-size:clamp(22px,3vw,30px);line-height:1.5;letter-spacing:0.01em;color:var(--ink);margin:64px 0 24px;padding-top:8px;scroll-margin-top:80px;}
.article h2 .no{font-family:var(--sans);font-style:italic;font-weight:800;font-size:0.8em;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-right:14px;}
.article h3{font-family:var(--jp);font-weight:700;font-size:clamp(17px,2.2vw,20px);color:var(--ink);margin:36px 0 14px;}
.article p{font-family:var(--jp);font-size:16px;font-weight:400;line-height:2.1;color:var(--ink-soft);margin-bottom:22px;letter-spacing:0.01em;}
.article p strong{color:var(--ink);font-weight:700;}
.article ul{list-style:none;margin:0 0 24px;padding:0;}
.article ul li{font-family:var(--jp);font-size:16px;font-weight:400;line-height:1.95;color:var(--ink-soft);padding:10px 0 10px 26px;position:relative;border-bottom:1px solid var(--line-soft);}
.article ul li::before{content:"";position:absolute;left:0;top:19px;width:9px;height:9px;border-radius:50%;background:var(--grad);}
.article ul li strong{color:var(--ink);font-weight:700;}
.article blockquote{margin:36px 0;padding:24px 28px;background:var(--card);border:1px solid var(--line);border-left:3px solid var(--green);border-radius:0 12px 12px 0;}
.article blockquote p{margin:0;font-weight:500;color:var(--ink);font-size:16px;line-height:1.95;}
.takeaway{margin:30px 0;padding:22px 26px;background:var(--bg-2);border-radius:12px;font-family:var(--jp);font-size:15.5px;font-weight:700;line-height:1.85;color:var(--ink);}
.takeaway .lbl{display:block;font-family:var(--sans);font-size:10.5px;font-weight:800;letter-spacing:0.16em;text-transform:uppercase;color:var(--green);margin-bottom:8px;}
.afaq{padding:60px 0 0;}
.afaq .eyebrow{margin-bottom:22px;}
.afaq details{border-bottom:1px solid var(--line);}
.afaq details:first-of-type{border-top:1px solid var(--line);}
.afaq summary{list-style:none;cursor:pointer;padding:22px 40px 22px 0;position:relative;font-family:var(--jp);font-weight:700;font-size:17px;line-height:1.6;color:var(--ink);transition:color 0.3s;}
.afaq summary::-webkit-details-marker{display:none;}
.afaq summary:hover{color:var(--green);}
.afaq summary::after{content:"+";position:absolute;right:4px;top:21px;font-size:20px;font-weight:400;color:var(--ink-faint);}
.afaq details[open] summary::after{content:"–";}
.afaq .fa-body{padding:0 0 24px;font-family:var(--jp);font-size:15px;font-weight:500;line-height:2;color:var(--ink-soft);}
.afaq .fa-body strong{color:var(--ink);font-weight:700;}
.afaq .fa-body a{color:var(--green);border-bottom:1px solid var(--green);}
.cta-box{margin:64px 0 0;padding:44px 40px;border-radius:18px;background:var(--night);color:var(--bg);text-align:center;position:relative;overflow:hidden;}
.cta-box .m{position:absolute;width:420px;height:420px;border-radius:50%;filter:blur(80px);background:radial-gradient(circle,rgba(20,184,112,0.22),transparent 64%);top:50%;left:50%;transform:translate(-50%,-50%);}
.cta-box h2{position:relative;z-index:2;font-family:var(--jp);font-weight:900;font-size:clamp(20px,2.8vw,28px);line-height:1.6;color:#fff;margin:0 0 12px;}
.cta-box p{position:relative;z-index:2;font-family:var(--jp);font-size:14.5px;font-weight:500;line-height:1.9;color:rgba(246,247,244,0.78);margin:0 auto 26px;max-width:480px;}
.cta-box .cta-q{position:relative;z-index:2;font-family:var(--mincho,var(--jp));font-size:15px;font-weight:500;line-height:1.95;color:rgba(246,247,244,0.9);margin:0 auto 18px;max-width:520px;font-style:italic;}
.cta-box .cta-next{position:relative;z-index:2;font-family:var(--jp);font-size:12.5px;font-weight:500;line-height:1.8;color:rgba(246,247,244,0.6);margin:0 auto 24px;max-width:480px;}
.cta-box .acts{position:relative;z-index:2;display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}
.btn{display:inline-flex;align-items:center;gap:10px;font-size:14.5px;font-weight:700;letter-spacing:0.02em;padding:15px 28px;border-radius:99px;transition:transform 0.32s,background 0.32s,color 0.32s,border-color 0.32s;}
.btn.bright{background:var(--green-bright);color:#062b1d;}
.btn.bright:hover{transform:translateY(-3px);}
.btn.outline{border:1px solid rgba(255,255,255,0.3);color:#fff;}
.btn.outline:hover{background:rgba(255,255,255,0.08);transform:translateY(-3px);}
.related{padding:60px 0 0;}
.related .eyebrow{margin-bottom:24px;}
.rel-link{display:block;padding:24px 0;border-top:1px solid var(--line);transition:padding-left 0.4s;}
.rel-link:last-child{border-bottom:1px solid var(--line);}
.rel-link:hover{padding-left:8px;}
.rel-link span{font-family:var(--sans);font-size:11px;font-weight:700;letter-spacing:0.12em;text-transform:uppercase;color:var(--green);}
.rel-link h3{font-family:var(--jp);font-weight:700;font-size:18px;line-height:1.5;color:var(--ink);margin-top:8px;transition:color 0.3s;}
.rel-link:hover h3{color:var(--green);}
footer{padding:48px 0;border-top:1px solid var(--line);background:var(--bg-2);text-align:center;}
footer .fb-en{font-family:var(--sans);font-weight:800;font-size:16px;color:var(--ink);}
footer .fb-jp{font-family:var(--jp);font-size:12px;font-weight:500;color:var(--ink-faint);margin-top:8px;display:block;}
footer .fb-links{margin-top:18px;display:flex;gap:24px;justify-content:center;flex-wrap:wrap;font-family:var(--sans);font-size:13px;font-weight:500;color:var(--ink-soft);}
footer .fb-links a:hover{color:var(--green);}
footer .fb-base{margin-top:24px;font-family:var(--sans);font-size:12px;color:var(--ink-mute);}
@media (max-width:680px){
  .wrap{padding-left:22px;padding-right:22px;}
  .nav{padding:14px 22px;}
  .ahead{padding:44px 0 24px;}
  .article{padding:8px 0 64px;}
  .cta-box{padding:36px 26px;}
}

/* ── GEO: quotable answer box (結論ファースト) + freshness ── */
.answer{position:relative;background:linear-gradient(180deg,rgba(11,110,79,0.055),rgba(11,110,79,0.02));border:1px solid rgba(11,110,79,0.16);border-left:4px solid var(--green);border-radius:14px;padding:20px 24px;margin:0 0 30px;}
.answer .a-lbl{display:inline-flex;align-items:center;gap:8px;font-family:var(--sans);font-size:11px;font-weight:800;letter-spacing:0.14em;text-transform:uppercase;color:var(--green);margin-bottom:8px;}
.answer .a-lbl::before{content:"";width:16px;height:16px;border-radius:5px;background:linear-gradient(120deg,#0B6E4F,#14B870);}
.answer p{font-family:var(--jp);font-size:15.5px;font-weight:600;line-height:1.9;color:var(--ink);margin:0;}
.ameta .date.upd{color:var(--ink-mute);}
@media (max-width:680px){.answer{padding:16px 18px;}.answer p{font-size:14.5px;}}

/* ── internal linking: nav product link + in-body solution note ── */
.nav-right{display:flex;align-items:center;gap:20px;flex-shrink:0;}
.nav-link{font-family:var(--jp);font-size:13px;font-weight:700;letter-spacing:0.02em;color:var(--ink-soft);white-space:nowrap;transition:color 0.3s;}
.nav-link:hover{color:var(--green);}
.soln-note{font-family:var(--jp);font-size:14px;font-weight:500;line-height:1.95;color:var(--ink-soft);background:var(--bg-2);border-radius:12px;padding:16px 20px;margin:30px 0;}
.soln-note a{color:var(--green);font-weight:700;border-bottom:1px solid var(--green);}
.soln-note a:hover{color:var(--green-bright);border-color:var(--green-bright);}
@media (max-width:680px){.nav{padding:14px 18px;}.nav-name .n-jp{display:none;}.nav-right{gap:14px;}.nav-link{font-size:12.5px;}.nav-cta{padding:10px 16px;font-size:12px;}}
@media (max-width:400px){.nav{padding:13px 14px;}.nav-brand{gap:9px;}.nav-mark{width:26px;height:26px;}.nav-name .n-en{font-size:14px;}.nav-right{gap:11px;}.nav-link{font-size:12px;}.nav-cta{padding:9px 13px;font-size:11.5px;letter-spacing:0.01em;}}
@media (max-width:360px){.nav-right .nav-link:first-of-type{display:none;}}

/* ── deep articles: templates / tables / checklists / pitfalls ── */
.tmpl{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--green);border-radius:12px;padding:18px 22px;margin:24px 0;}
.tmpl .t-h{display:block;font-family:var(--sans);font-size:11px;font-weight:800;letter-spacing:0.12em;text-transform:uppercase;color:var(--green);margin-bottom:12px;}
.tmpl p{font-family:var(--jp);font-size:14.5px;line-height:1.85;margin:7px 0;color:var(--ink-soft);}
.tmpl p .who{display:inline-block;min-width:5.2em;font-weight:700;color:var(--ink-faint);}
.tmpl p.q{color:var(--ink);}
.tbl-wrap{overflow-x:auto;margin:24px 0;-webkit-overflow-scrolling:touch;}
table.tbl{width:100%;border-collapse:collapse;font-family:var(--jp);font-size:13.5px;min-width:460px;}
table.tbl th,table.tbl td{border:1px solid var(--line);padding:10px 13px;text-align:left;vertical-align:top;line-height:1.7;color:var(--ink-soft);}
table.tbl th{background:var(--bg-2);font-weight:700;color:var(--ink);white-space:nowrap;}
table.tbl td strong{color:var(--ink);}
ul.checklist{list-style:none;margin:20px 0;padding:0;}
ul.checklist li{position:relative;padding:9px 0 9px 30px;border-bottom:1px solid var(--line-soft);font-family:var(--jp);font-size:14.5px;line-height:1.8;color:var(--ink-soft);}
ul.checklist li::before{content:"✓";position:absolute;left:3px;top:9px;color:var(--green);font-weight:900;}
.pitfall{background:rgba(180,70,40,0.045);border:1px solid rgba(180,70,40,0.16);border-radius:12px;padding:18px 22px;margin:24px 0;}
.pitfall .p-h{display:block;font-family:var(--sans);font-size:11px;font-weight:800;letter-spacing:0.1em;text-transform:uppercase;color:#a8482f;margin-bottom:10px;}
.pitfall ul{margin:0;padding-left:20px;}
.pitfall li{font-family:var(--jp);font-size:14.5px;line-height:1.85;color:var(--ink-soft);margin:5px 0;}
@media (max-width:680px){.tmpl,.pitfall{padding:16px 18px;}.tmpl p .who{display:block;min-width:0;margin-bottom:2px;}}

.skip-link{position:absolute;left:-9999px;top:0;z-index:300;background:#0B6E4F;color:#fff;padding:12px 20px;font-size:13px;font-weight:700;border-radius:0 0 10px 0;}
.skip-link:focus{left:0;}

/* Source footnotes / citation superscripts (added for toB article upgrades) */
.article .note{font-family:var(--jp);font-size:12.5px;line-height:1.85;color:var(--ink-mute);margin:30px 0 0;padding-top:15px;border-top:1px solid var(--line);}
.article .note a{color:var(--ink-soft);}
.article sup{line-height:0;}
.article sup a{color:var(--green);text-decoration:none;font-weight:700;}