:root{
  --bg:#f6f4ef; --surface:#fff; --surface-2:#f1eee7; --ink:#24231f; --muted:#6e6b63;
  --line:#ded9cf; --accent:#176b5d; --accent-2:#e7f3ef; --warn:#9c4a24; --warn-bg:#fff1e7;
  --shadow:0 12px 34px rgba(40,36,28,.08); --radius:22px; --max:1120px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Sans","Yu Gothic UI",Meiryo,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65}
a{color:inherit} img{max-width:100%;display:block}.wrap{width:min(calc(100% - 32px),var(--max));margin:auto}
.site-header{position:sticky;top:0;z-index:30;background:rgba(246,244,239,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(222,217,207,.8)}
.header-inner{height:68px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{text-decoration:none;font-weight:800;letter-spacing:.01em}.brand small{display:block;font-size:10px;color:var(--muted);font-weight:600;letter-spacing:.08em;text-transform:uppercase}.header-link{font-size:14px;text-decoration:none;color:var(--muted)}
.hero{padding:70px 0 48px}.eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--accent-2);color:var(--accent);padding:7px 12px;border-radius:999px;font-size:13px;font-weight:700}.hero h1{font-size:clamp(38px,7vw,72px);line-height:1.08;letter-spacing:-.04em;margin:18px 0 16px;max-width:900px}.hero p{font-size:clamp(17px,2.2vw,21px);color:var(--muted);max-width:700px;margin:0 0 28px}.actions{display:flex;gap:12px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 19px;border-radius:14px;text-decoration:none;font-weight:750;border:1px solid var(--line);background:var(--surface);cursor:pointer;font:inherit}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.ghost{background:transparent}.section{padding:48px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:22px}.section-head h2{font-size:clamp(26px,4vw,40px);line-height:1.2;margin:0}.section-head p{max-width:520px;color:var(--muted);margin:0}.grid{display:grid;gap:16px}.grid-4{grid-template-columns:repeat(4,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 1px 0 rgba(0,0,0,.02);padding:22px}.card-link{text-decoration:none;transition:.2s transform,.2s box-shadow,.2s border-color}.card-link:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:#c9c1b4}.category-icon,.part-icon{width:54px;height:54px;border-radius:16px;background:var(--surface-2);display:grid;place-items:center;margin-bottom:16px}.category-icon svg,.part-icon svg{width:32px;height:32px;stroke:var(--ink);fill:none;stroke-width:1.8}.card h3{margin:0 0 6px;font-size:19px}.card p{margin:0;color:var(--muted);font-size:14px}.meta{font-size:12px;color:var(--muted);margin-top:11px}.part-grid{grid-template-columns:repeat(5,1fr)}.part-card{padding:18px}.part-card h3{font-size:16px}.part-card .part-icon{width:100%;height:112px;border-radius:18px}.part-card .part-icon svg{width:72px;height:72px}
.flow{counter-reset:steps}.flow .card{position:relative;padding-top:64px}.flow .card:before{counter-increment:steps;content:counter(steps);position:absolute;top:18px;left:20px;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:#fff;font-weight:800}
.problem-list{display:grid;grid-template-columns:1fr 1fr;gap:12px}.problem{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:15px 16px;text-decoration:none;font-weight:650}.problem span{color:var(--muted);font-weight:500;font-size:13px;display:block;margin-top:2px}
.footer{padding:44px 0 60px;color:var(--muted);font-size:13px}.footer-inner{border-top:1px solid var(--line);padding-top:24px;display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}
/* identify */
.subhero{padding:38px 0 20px}.breadcrumbs{font-size:13px;color:var(--muted);margin-bottom:14px}.breadcrumbs a{text-decoration:none}.subhero h1{font-size:clamp(30px,5vw,48px);line-height:1.15;margin:0 0 10px}.subhero p{color:var(--muted);margin:0;max-width:720px}.wizard-shell{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:20px;align-items:start}.wizard{background:var(--surface);border:1px solid var(--line);border-radius:26px;padding:28px;min-height:500px}.progress{display:flex;gap:8px;margin-bottom:24px}.progress span{height:6px;flex:1;border-radius:999px;background:#e8e4dc}.progress span.on{background:var(--accent)}.step-label{font-size:13px;color:var(--accent);font-weight:800}.wizard h2{font-size:30px;line-height:1.25;margin:8px 0 8px}.wizard .lead{color:var(--muted);margin:0 0 22px}.choice-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.choice{border:1px solid var(--line);border-radius:18px;background:#fff;padding:18px;text-align:left;cursor:pointer;transition:.15s}.choice:hover,.choice:focus{border-color:var(--accent);outline:none;box-shadow:0 0 0 3px var(--accent-2)}.choice strong{display:block;font-size:17px;margin-bottom:3px}.choice span{font-size:13px;color:var(--muted)}.side-note{background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:20px;position:sticky;top:90px}.side-note h3{margin:0 0 9px;font-size:16px}.side-note p{color:var(--muted);font-size:13px;margin:0}.candidate-list{display:grid;gap:12px}.candidate{display:grid;grid-template-columns:84px 1fr auto;gap:14px;align-items:center;border:1px solid var(--line);border-radius:18px;padding:13px}.candidate.best{border-color:var(--accent);background:var(--accent-2)}.candidate-ill{height:72px;border-radius:14px;background:#fff;display:grid;place-items:center}.candidate-ill svg{width:54px;height:54px;stroke:var(--ink);fill:none;stroke-width:1.7}.candidate h3{margin:0 0 3px;font-size:17px}.candidate p{margin:0;color:var(--muted);font-size:13px}.candidate .tag{font-size:11px;font-weight:800;color:var(--accent);background:#fff;padding:5px 8px;border-radius:999px;white-space:nowrap}.wizard-actions{display:flex;justify-content:space-between;gap:12px;margin-top:22px}.hidden{display:none!important}
/* detail */
.detail-hero{padding:40px 0 24px}.detail-title{display:grid;grid-template-columns:1fr 380px;gap:32px;align-items:center}.detail-title h1{font-size:clamp(36px,6vw,62px);line-height:1.08;letter-spacing:-.03em;margin:8px 0 12px}.detail-title p{font-size:17px;color:var(--muted);margin:0 0 18px}.answer-chip{display:inline-block;background:var(--accent-2);color:var(--accent);font-size:13px;font-weight:800;padding:7px 12px;border-radius:999px}.hero-visual{background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:8px;overflow:hidden}.hero-visual img{border-radius:18px;width:100%;height:300px;object-fit:cover;object-position:left center}.panel{background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:26px}.panel h2{font-size:28px;line-height:1.25;margin:0 0 8px}.panel>p{color:var(--muted);margin:0 0 20px}.variant-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.variant{border:1px solid var(--line);border-radius:18px;overflow:hidden;background:#fff;cursor:pointer}.variant input{position:absolute;opacity:0}.variant img{width:100%;aspect-ratio:4/3;object-fit:cover}.variant-body{padding:14px}.variant strong{display:block}.variant span{font-size:13px;color:var(--muted)}.variant:has(input:checked){border:2px solid var(--accent);box-shadow:0 0 0 4px var(--accent-2)}.size-row{display:flex;gap:9px;flex-wrap:wrap}.size{border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 16px;font:inherit;font-weight:700;cursor:pointer}.size.active{background:var(--accent);border-color:var(--accent);color:#fff}.measure-layout{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:center}.measure-layout img{border:1px solid var(--line);border-radius:18px}.result-box{background:#f7fbf9;border:1px solid #bcd8d0;border-radius:20px;padding:20px}.result-box h3{margin:0 0 10px}.result-list{list-style:none;padding:0;margin:0}.result-list li{display:flex;justify-content:space-between;border-top:1px solid #d8e9e4;padding:9px 0}.result-list li:first-child{border-top:0}.stop{background:var(--warn-bg);border:1px solid #efc4aa;border-radius:18px;padding:18px;margin-top:18px}.stop h3{color:var(--warn);margin:0 0 8px;font-size:17px}.stop ul{margin:0;padding-left:20px}.product-demo{margin-top:16px;padding:16px;border:1px dashed var(--line);border-radius:16px;background:#fff}.product-query{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--surface-2);padding:9px 11px;border-radius:10px;margin-top:8px;font-size:13px;word-break:break-all}.article{max-width:780px}.article h2{margin-top:34px}.source-list{font-size:13px;color:var(--muted)}
@media(max-width:900px){.grid-4{grid-template-columns:repeat(2,1fr)}.part-grid{grid-template-columns:repeat(2,1fr)}.wizard-shell,.detail-title{grid-template-columns:1fr}.side-note{position:static}.detail-title{gap:18px}.hero-visual img{height:260px}.measure-layout{grid-template-columns:1fr}.grid-3{grid-template-columns:1fr}.grid-2{grid-template-columns:1fr}}
@media(max-width:600px){.wrap{width:min(calc(100% - 22px),var(--max))}.header-inner{height:60px}.hero{padding:46px 0 30px}.hero h1{font-size:42px}.section{padding:34px 0}.section-head{display:block}.section-head p{margin-top:10px}.grid-4{grid-template-columns:1fr 1fr}.part-grid{grid-template-columns:1fr 1fr;gap:10px}.part-card{padding:12px}.part-card .part-icon{height:90px}.part-card .part-icon svg{width:56px;height:56px}.problem-list{grid-template-columns:1fr}.choice-grid{grid-template-columns:1fr}.wizard{padding:20px;min-height:auto}.wizard h2{font-size:25px}.candidate{grid-template-columns:70px 1fr}.candidate .tag{grid-column:2}.detail-hero{padding-top:26px}.detail-title h1{font-size:42px}.hero-visual img{height:auto;object-fit:contain}.panel{padding:20px}.variant-grid{grid-template-columns:1fr}.grid-2{grid-template-columns:1fr}.actions .btn{flex:1}.footer-inner{display:block}.footer-inner>div+div{margin-top:8px}}

/* phase 2 additions */
.candidate-btn{margin-top:10px;min-height:38px;padding:0 13px;font-size:13px}.soon{display:inline-block;margin-top:10px;font-size:12px;color:var(--muted);background:var(--surface-2);padding:6px 9px;border-radius:999px}.pair-note{margin-top:14px;padding:12px 14px;border-radius:14px;background:#fff7df;border:1px solid #ead49c;font-size:13px}.option-ill{aspect-ratio:4/3;display:grid;place-items:center;background:var(--surface-2);font-size:42px;color:var(--accent)}

/* image accuracy policy v2: usage-position illustrations are removed from public HTML */
.detail-title{grid-template-columns:1fr!important}
.measure-form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.measure-field{display:grid;gap:7px;align-content:start}
.measure-field label{font-weight:800;line-height:1.4}
.measure-field input{width:100%;min-height:48px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);padding:10px 12px;font:inherit}
.measure-field input:focus{border-color:var(--accent);outline:3px solid var(--accent-2)}
.measure-field small{color:var(--muted);font-size:12px;line-height:1.5}
.measure-note{font-size:13px;color:var(--muted);margin:16px 0 0}
@media(max-width:600px){.measure-form{grid-template-columns:1fr}}


/* concept v2: beginner-first name discovery */
.beginner-hero .hero-note{display:inline-block;margin-top:18px;padding:10px 13px;border-radius:12px;background:rgba(255,255,255,.66);color:var(--muted);font-size:13px}
.part-card .part-shape{margin-top:10px;padding-top:10px;border-top:1px solid var(--line);font-size:12px;line-height:1.55;color:var(--muted)}
.simple-boundary{display:grid;grid-template-columns:180px 1fr;gap:10px 22px;background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:24px}
.simple-boundary p{margin:0;color:var(--muted)}
.candidate-clue{margin-top:8px;font-size:12px;line-height:1.55;color:var(--muted)}
.simple-detail h1{font-size:clamp(44px,7vw,72px);line-height:1.05;margin:10px 0}
.detail-lead{max-width:760px;font-size:18px!important;line-height:1.8}
.beginner-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(280px,.8fr);gap:18px;align-items:start}
.shape-hint{font-size:18px!important;line-height:1.8;color:var(--ink)!important}
.quick-facts{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}
.quick-facts>div{background:var(--surface-2);border-radius:14px;padding:14px}
.quick-facts span{display:block;font-size:12px;color:var(--muted);margin-bottom:4px}
.quick-facts strong{line-height:1.5}
.alias-list{display:flex;flex-wrap:wrap;gap:8px}
.alias-list span{background:var(--surface-2);border:1px solid var(--line);border-radius:999px;padding:8px 11px;font-size:13px;font-weight:700}
.variant-chips{display:flex;flex-wrap:wrap;gap:9px;margin-top:16px}
.variant-chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 14px;font:inherit;font-weight:700;cursor:pointer}
.variant-chip.active{background:var(--accent);border-color:var(--accent);color:#fff}
.plain-points{margin:16px 0 0;padding:0;list-style:none;display:grid;gap:10px}
.plain-points li{position:relative;padding:13px 14px 13px 42px;border:1px solid var(--line);border-radius:14px;background:#fff}
.plain-points li:before{content:"✓";position:absolute;left:15px;top:12px;color:var(--accent);font-weight:900}
.soft-note{margin-top:18px!important;padding:14px 16px;background:var(--surface-2);border-radius:14px;font-size:13px}
.search-builder .product-query{font-size:16px;padding:14px;margin:14px 0 18px}
.tech-details{border:1px solid var(--line);border-radius:18px;background:var(--surface);overflow:hidden}
.tech-details summary{cursor:pointer;padding:17px 20px;font-weight:800}
.tech-details .tech-body{padding:0 20px 20px;color:var(--muted)}
.tech-details .plain-points li{background:var(--surface-2)}
@media(max-width:900px){.beginner-grid{grid-template-columns:1fr}}
@media(max-width:600px){.simple-boundary{grid-template-columns:1fr;gap:5px}.simple-boundary p+strong{margin-top:10px}.quick-facts{grid-template-columns:1fr}.candidate-clue{grid-column:1/-1}}


/* v2 UX validation: compare instead of ranking */
.compare-note{margin-bottom:12px;padding:12px 14px;border-radius:14px;background:var(--surface-2);color:var(--muted);font-size:13px}
.candidate-compare-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.compare-card{display:block;padding:0;overflow:hidden;background:#fff}
.compare-ill{height:150px;border-radius:0;background:var(--surface-2)}
.compare-ill svg{width:92px;height:92px}
.compare-body{padding:18px}.compare-body h3{font-size:21px;margin:0 0 10px}.compare-shape{font-size:14px!important;line-height:1.65}
.visual-tags{display:flex;flex-wrap:wrap;gap:7px}.visual-tags span{display:inline-block;border-radius:999px;background:var(--accent-2);color:var(--accent);padding:6px 9px;font-size:12px;font-weight:800}
.detail-tags{margin:0 0 18px}
.no-match{margin-top:16px;padding:18px;border:1px dashed var(--line);border-radius:18px;background:var(--surface-2)}
.no-match strong{font-size:17px}.no-match p{margin:5px 0 12px;color:var(--muted);font-size:13px}
.clear-variant{border-style:dashed}
.shop-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.shop-actions .btn{min-height:46px}
.search-note{margin:14px 0 0!important;color:var(--muted);font-size:12px}
@media(max-width:700px){.candidate-compare-grid{grid-template-columns:1fr}.compare-ill{height:126px}.compare-ill svg{width:78px;height:78px}.shop-actions{display:grid}.shop-actions .btn{width:100%}}


/* top card illustrations */
.part-card .part-icon.part-art{width:100%;height:auto;aspect-ratio:4/3;overflow:hidden;background:#f7f5f0;margin-bottom:14px}
.part-card .part-icon.part-art img{width:100%;height:100%;object-fit:cover}
.part-card .part-icon.part-art svg{width:auto;height:auto}
.part-card>p{line-height:1.55}
@media(max-width:600px){
  .part-card{padding:10px}
  .part-card .part-icon.part-art{height:auto;aspect-ratio:4/3;margin-bottom:12px}
  .part-card h3{font-size:16px;line-height:1.35}
  .part-card>p{font-size:13px;line-height:1.5}
}


/* 30-part grouped catalog */
.part-groups{display:grid;gap:34px}
.part-group-title{display:flex;align-items:baseline;gap:10px;margin:0 0 14px;font-size:22px}
.part-group-title span{font-size:12px;color:var(--muted);font-weight:700}
.candidate-art{overflow:hidden;background:#f7f5f0}
.candidate-art img{width:100%;height:100%;object-fit:cover}
@media(max-width:600px){.part-groups{gap:28px}.part-group-title{font-size:19px}}


.candidate-art .part-art{width:100%;height:100%;margin:0;border-radius:0}


.detail-art{width:100%;aspect-ratio:4/3;border-radius:18px;background:#f7f5f0;overflow:hidden;margin:16px 0}
.detail-art img{width:100%;height:100%;object-fit:cover}


/* SEO landing pages */
.seo-hero{padding:56px 0 28px}.seo-hero h1{font-size:clamp(30px,5vw,48px);line-height:1.2;margin:8px 0 18px}.seo-hero p{max-width:760px;color:var(--muted);font-size:17px;line-height:1.8}
.seo-nav{display:flex;flex-wrap:wrap;gap:9px;margin-top:18px}.seo-nav a{display:inline-flex;padding:9px 12px;border:1px solid var(--line);border-radius:999px;background:#fff;font-weight:700;font-size:13px}
.seo-copy{max-width:800px}.seo-copy h2{font-size:26px;margin:32px 0 12px}.seo-copy h3{font-size:20px;margin:26px 0 8px}.seo-copy p,.seo-copy li{line-height:1.85;color:var(--muted)}.seo-copy ul{padding-left:1.25em}
.seo-parts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:18px}.seo-part-card{display:block;padding:18px;border:1px solid var(--line);border-radius:18px;background:#fff}.seo-part-card strong{display:block;font-size:18px;color:var(--text);margin-bottom:6px}.seo-part-card span{font-size:13px;line-height:1.65;color:var(--muted)}
.related-guides{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.related-guides a{display:block;padding:16px;border:1px solid var(--line);border-radius:16px;background:#fff;font-weight:700}
@media(max-width:700px){.seo-hero{padding-top:34px}.seo-parts,.related-guides{grid-template-columns:1fr}.seo-copy h2{font-size:22px}}

/* privacy */
.policy{max-width:860px}
.policy h2{font-size:22px;margin:32px 0 10px}
.policy h2:first-child{margin-top:0}
.policy p{color:var(--muted);line-height:1.9}
.policy-date{margin-top:34px;font-size:13px}
.footer-privacy-link{color:inherit;font-size:12px;text-decoration:underline;text-underline-offset:3px}
.footer-inner{gap:10px;flex-wrap:wrap}

/* Affiliate disclosures on part detail pages (LinkSwitch only loads here). */
.affiliate-top-disclosure{font-size:12px;color:var(--muted);margin:0 0 12px;line-height:1.6}
.affiliate-disclosure{display:flex;align-items:flex-start;gap:10px;font-size:12px;line-height:1.65;color:var(--muted);margin-bottom:18px;padding:12px 14px;border:1px solid var(--line);background:var(--surface-2);border-radius:12px}
.affiliate-pr{font-size:11px;font-weight:800;flex:0 0 auto;line-height:1.3;padding:4px 6px;border:1px solid var(--accent);border-radius:4px;color:var(--accent);background:var(--surface)}