:root{
  --navy:#17324a;
  --navy-deep:#0d2233;
  --blue:#2e6691;
  --blue-dark:#245174;
  --blue-soft:#eaf2f8;
  --blue-pale:#f4f8fb;
  --slate:#657684;
  --ink:#26343f;
  --muted:#687784;
  --line:#d3dde5;
  --paper:#f6f8fa;
  --white:#ffffff;
  --max:1220px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"Yu Gothic","Hiragino Kaku Gothic ProN","Noto Sans JP",Meiryo,sans-serif;line-height:1.9;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button,input,textarea{font:inherit}
.container{width:min(calc(100% - 56px),var(--max));margin-inline:auto}
.serif,h1,h2,.chapter-title,.page-title{font-family:"Yu Gothic","Hiragino Kaku Gothic ProN","Noto Sans JP",Meiryo,sans-serif;font-weight:700;letter-spacing:-.025em}
.section{padding:104px 0}
.section-white{background:var(--white)}
.section-ink{background:var(--navy-deep);color:#fff}
.section-paper2{background:var(--blue-pale)}
.sample-note{margin:0;padding:15px 18px;border-left:4px solid var(--blue);background:#f2f7fb;color:#526777;font-size:12px;line-height:1.8}
.eyebrow{margin:0 0 16px;color:var(--blue);font-size:11px;font-weight:800;letter-spacing:.17em;text-transform:uppercase}
.section-title{max-width:860px;margin:0;font-size:clamp(33px,4.2vw,54px);line-height:1.42}
.section-lead{max-width:760px;margin:22px 0 0;color:var(--muted);font-size:15px;line-height:2.05}

/* Header: clear, stable corporate hierarchy */
.site-header{background:var(--white);border-top:6px solid var(--navy);box-shadow:0 2px 14px rgba(23,50,74,.06)}
.header-top{border-bottom:1px solid var(--line)}
.brand-row{min-height:108px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:36px}
.logo img{width:255px;height:auto}
.brand-note{justify-self:end;text-align:right}
.brand-note span{display:block;color:var(--blue);font-size:10px;font-weight:900;letter-spacing:.18em}
.brand-note small{display:block;margin-top:5px;color:#677681;font-size:11px;font-weight:700}
.menu-button{display:none;border:1px solid var(--navy);background:var(--white);color:var(--navy);padding:10px 14px;font-size:11px;font-weight:900;letter-spacing:.1em}
.nav-bar{background:var(--navy)}
.nav-row{min-height:58px;display:flex;align-items:center;justify-content:space-between;gap:30px}
.site-nav{display:flex;align-items:stretch}
.site-nav a{display:flex;align-items:center;min-height:58px;padding:0 24px;border-left:1px solid rgba(255,255,255,.13);color:#eef4f8;font-size:12px;font-weight:800;letter-spacing:.02em}
.site-nav a:last-child{border-right:1px solid rgba(255,255,255,.13)}
.site-nav a:hover,.site-nav a[aria-current="page"]{background:var(--blue);color:#fff}
.nav-inquiry{display:inline-flex;align-items:center;gap:10px;color:#fff;font-size:12px;font-weight:900}
.nav-inquiry::after{content:"→";font-size:14px}

/* Buttons / links */
.text-link{display:inline-flex;align-items:center;gap:12px;padding:10px 0 7px;border-bottom:2px solid var(--blue);color:var(--navy);font-size:12px;font-weight:900;letter-spacing:.02em}
.text-link::after{content:"→"}
.text-link.light{color:#fff;border-bottom-color:#fff}
.button{display:inline-flex;align-items:center;justify-content:center;min-width:190px;padding:14px 22px;border:1px solid var(--navy);border-radius:2px;background:var(--white);color:var(--navy);font-size:12px;font-weight:900;letter-spacing:.02em;transition:.2s}
.button:hover{background:var(--navy);color:#fff}
.button-blue{border-color:var(--blue);background:var(--blue);color:#fff}
.button-blue:hover{background:var(--blue-dark);border-color:var(--blue-dark)}
.button-light{border-color:#fff;background:transparent;color:#fff}
.button-light:hover{background:#fff;color:var(--navy)}

/* Home hero */
.home-hero{position:relative;border-bottom:1px solid var(--line);background:linear-gradient(90deg,#ffffff 0%,#ffffff 52%,#f1f6fa 52%,#f1f6fa 100%)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.06fr) minmax(430px,.94fr);min-height:690px}
.hero-copy{display:flex;flex-direction:column;justify-content:center;padding:78px 78px 86px 0}
.chapter{display:inline-flex;align-items:center;gap:12px;margin:0 0 28px;color:var(--blue);font-size:11px;font-weight:900;letter-spacing:.14em;text-transform:uppercase}
.chapter::before{content:"";width:34px;height:3px;background:var(--blue)}
.hero-copy h1{max-width:740px;margin:0;color:var(--navy);font-size:clamp(46px,5.9vw,76px);line-height:1.24}
.hero-copy h1 .accent{color:var(--blue)}
.hero-copy .hero-text{max-width:650px;margin:28px 0 0;color:#526573;font-size:15px;line-height:2.1}
.hero-links{display:flex;gap:28px;flex-wrap:wrap;margin-top:34px}
.hero-diagram{position:relative;margin:0;display:flex;align-items:center;justify-content:center;padding:64px 0 64px 62px}
.hero-diagram::before{content:"給排水設備工事 / 関西";position:absolute;left:62px;top:44px;z-index:2;padding:7px 11px;background:var(--navy);color:#fff;font-size:10px;font-weight:800;letter-spacing:.08em}
.hero-diagram img{width:100%;max-width:570px;border:1px solid #c8d6e0;background:#f5f9fc;box-shadow:0 18px 40px rgba(23,50,74,.12)}
.hero-diagram figcaption{position:absolute;right:2px;bottom:50px;writing-mode:vertical-rl;color:#637787;font-size:10px;font-weight:700;letter-spacing:.16em}

/* Facts band */
.fact-band{background:var(--white);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.fact-row{display:grid;grid-template-columns:repeat(3,1fr)}
.fact-item{padding:28px 32px;border-left:1px solid var(--line)}
.fact-item:last-child{border-right:1px solid var(--line)}
.fact-item small{display:block;color:var(--blue);font-size:10px;font-weight:900;letter-spacing:.14em}
.fact-item strong{display:block;margin-top:5px;color:var(--navy);font-size:20px;font-weight:800}

/* Editorial intro */
.editorial-intro{display:grid;grid-template-columns:220px 1fr;gap:72px;align-items:start}
.editorial-index{position:sticky;top:32px;padding-top:8px;border-top:4px solid var(--blue)}
.editorial-index span{display:block;margin-top:18px;color:#a5b6c3;font-size:68px;font-weight:800;line-height:1}
.editorial-index small{display:block;margin-top:10px;color:#738493;font-size:10px;font-weight:800;letter-spacing:.14em}
.editorial-copy blockquote{max-width:820px;margin:0;color:var(--navy);font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:clamp(32px,4.2vw,52px);line-height:1.58;font-weight:600}
.editorial-copy p{max-width:720px;margin:26px 0 0;color:var(--muted);font-size:15px;line-height:2.05}

/* Service index */
.service-index{margin-top:48px;border-top:2px solid var(--navy)}
.service-index-row{display:grid;grid-template-columns:94px minmax(0,1fr) 230px;gap:34px;align-items:center;padding:32px 10px;border-bottom:1px solid var(--line);transition:.2s}
.service-index-row:hover{background:#fff}
.service-index-row .num{font-size:30px;font-weight:800;color:#9fb0bd}
.service-index-row h3{margin:0;color:var(--navy);font-size:26px;font-weight:800;line-height:1.45}
.service-index-row p{margin:8px 0 0;color:var(--muted);font-size:13px}
.service-index-row .aside{padding-left:22px;border-left:2px solid #dbe5ec;color:#6e7f8b;font-size:12px}

/* Trust statement */
.statement{position:relative;overflow:hidden;background:var(--navy-deep);color:#fff}
.statement::before{content:"WATERWORKS";position:absolute;right:-20px;bottom:-30px;color:rgba(255,255,255,.035);font-size:118px;font-weight:900;letter-spacing:-.04em}
.statement-inner{position:relative;z-index:1;display:grid;grid-template-columns:1fr 340px;gap:80px;align-items:end;padding:96px 0}
.statement h2{max-width:820px;margin:0;font-size:clamp(34px,4.5vw,56px);line-height:1.5}
.statement p{margin:20px 0 0;color:#c9d7e1;max-width:720px}
.statement-aside{border-top:3px solid var(--blue);padding-top:18px;color:#dbe5ec;font-size:12px;line-height:2}

/* Page header */
.page-hero{background:var(--white);border-bottom:1px solid var(--line)}
.page-hero-grid{display:grid;grid-template-columns:150px 1fr;gap:52px;align-items:end;padding:76px 0 64px}
.page-number{color:#b6c4ce;font-size:72px;font-weight:800;line-height:.9}
.breadcrumb{margin:0 0 14px;color:#778795;font-size:11px;font-weight:700}
.page-title{margin:0;color:var(--navy);font-size:clamp(42px,5.6vw,66px);line-height:1.2}
.page-hero p:last-child{max-width:700px;margin:18px 0 0;color:var(--muted)}

/* About */
.about-lead{display:grid;grid-template-columns:1.05fr .95fr;gap:82px;align-items:start}
.about-lead h2{margin:0;color:var(--navy);font-size:clamp(34px,4.2vw,52px);line-height:1.52}
.about-lead p{margin:0;color:var(--muted);font-size:15px;line-height:2.15}
.about-side-note{margin-top:10px;padding:18px 20px;border-left:4px solid var(--blue);background:var(--blue-pale);font-size:12px;color:#657785}
.company-table{margin-top:46px;border-top:2px solid var(--navy)}
.company-row{display:grid;grid-template-columns:220px 1fr;gap:32px;padding:20px 18px;border-bottom:1px solid var(--line);background:#fff;font-size:14px}
.company-row:nth-child(even){background:#f8fafb}
.company-row dt{font-weight:900;color:var(--navy)}
.company-row dd{margin:0;color:#52616c}

/* Service */
.service-split{margin-top:50px;border-top:2px solid var(--navy)}
.service-panel{display:grid;grid-template-columns:180px 1fr;min-height:310px;border-bottom:1px solid var(--line);background:#fff}
.service-panel .service-label{padding:36px 30px 30px 0;border-right:1px solid var(--line);color:var(--blue);font-size:11px;font-weight:900;letter-spacing:.14em}
.service-panel .service-body{padding:38px 0 42px 48px}
.service-panel h2{margin:0;color:var(--navy);font-size:clamp(30px,3.4vw,44px);line-height:1.5}
.service-panel p{max-width:720px;margin:18px 0 0;color:var(--muted)}
.service-panel:nth-child(even) .service-body{background:#f5f8fa;padding-right:40px}

/* Business */
.business-ledger{margin-top:46px;border-top:3px solid var(--navy)}
.business-entry{display:grid;grid-template-columns:100px 1fr 300px;gap:34px;padding:34px 12px;border-bottom:1px solid var(--line);align-items:start;background:#fff}
.business-entry:nth-child(even){background:#f7f9fb}
.business-entry .entry-no{font-size:30px;font-weight:800;color:#9fb0bd}
.business-entry h2{margin:0;color:var(--navy);font-size:27px;line-height:1.5}
.business-entry p{margin:9px 0 0;color:var(--muted);font-size:14px}
.business-entry aside{padding-left:22px;border-left:2px solid #dbe5ec;font-size:12px;color:#6f7f8b}

/* Contact */
.contact-stage{display:grid;grid-template-columns:360px 1fr;gap:68px;align-items:start}
.contact-info{padding:32px;border-top:6px solid var(--blue);background:var(--navy);color:#fff}
.contact-info h2{margin:0;font-size:34px;line-height:1.4}
.contact-info p{margin:15px 0 0;color:#cad8e2;font-size:13px}
.contact-data{margin-top:26px;border-top:1px solid rgba(255,255,255,.2)}
.contact-data div{padding:16px 0;border-bottom:1px solid rgba(255,255,255,.15)}
.contact-data span{display:block;color:#9bc0dc;font-size:10px;font-weight:900;letter-spacing:.12em}
.contact-data strong{display:block;margin-top:4px;font-size:15px}
.contact-form{background:var(--white);border:1px solid var(--line);padding:40px 44px;box-shadow:0 12px 32px rgba(23,50,74,.07)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px 28px}
.contact-form label{display:block;color:var(--navy);font-size:12px;font-weight:900}
.contact-form .full{grid-column:1/-1}
.contact-form input,.contact-form textarea{width:100%;margin-top:9px;padding:13px 12px;border:1px solid #cbd7df;background:#fbfcfd;outline:none;border-radius:2px}
.contact-form input:focus,.contact-form textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(46,102,145,.10)}
.form-actions{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:28px}
.form-note{margin:0;color:#73818b;font-size:11px;line-height:1.8}

/* CTA / footer */
.contact-cta{border-top:1px solid var(--line);background:var(--blue-soft)}
.contact-cta-inner{display:grid;grid-template-columns:1fr auto;gap:50px;align-items:center;padding:58px 0}
.contact-cta h2{margin:0;color:var(--navy);font-size:clamp(29px,3.6vw,44px);line-height:1.5}
.contact-cta p{margin:9px 0 0;color:var(--muted)}
.site-footer{background:var(--navy-deep);color:#fff}
.footer-main{display:grid;grid-template-columns:1fr auto;gap:50px;align-items:end;padding:50px 0 30px}
.footer-logo img{width:245px;filter:brightness(0) invert(1)}
.footer-nav{display:flex;gap:18px 28px;flex-wrap:wrap;justify-content:flex-end;color:#d4e0e8;font-size:11px;font-weight:700}
.footer-nav a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;gap:24px;padding:19px 0 24px;border-top:1px solid rgba(255,255,255,.16);color:#98a9b5;font-size:10px}

@media(max-width:980px){
  .brand-row{min-height:94px}
  .brand-note{display:none}
  .menu-button{display:block;justify-self:end}
  .nav-bar{position:relative}
  .nav-row{min-height:0;display:block}
  .site-nav{display:none}
  .site-nav.open{display:flex;position:absolute;z-index:40;left:0;right:0;top:0;flex-direction:column;background:var(--navy);box-shadow:0 18px 32px rgba(13,34,51,.18)}
  .site-nav.open a{min-height:50px;border-right:0;border-left:0;border-bottom:1px solid rgba(255,255,255,.12)}
  .nav-inquiry{display:none}
  .hero-grid{grid-template-columns:1fr;min-height:auto}
  .home-hero{background:#fff}
  .hero-copy{padding:76px 0 54px}
  .hero-diagram{padding:18px 0 70px}
  .hero-diagram::before{left:0;top:0}
  .hero-diagram img{max-width:760px;margin-top:30px}
  .hero-diagram figcaption{display:none}
  .editorial-intro{grid-template-columns:150px 1fr;gap:46px}
  .statement-inner{grid-template-columns:1fr;gap:36px}
  .about-lead{grid-template-columns:1fr;gap:38px}
  .service-index-row{grid-template-columns:80px 1fr}
  .service-index-row .aside{grid-column:2}
  .business-entry{grid-template-columns:80px 1fr}
  .business-entry aside{grid-column:2}
  .contact-stage{grid-template-columns:1fr;gap:38px}
  .contact-info{max-width:620px}
}

@media(max-width:760px){
  .container{width:min(calc(100% - 28px),var(--max))}
  .section{padding:72px 0}
  .site-header{border-top-width:4px}
  .brand-row{min-height:80px;grid-template-columns:1fr auto;gap:18px}
  .logo img{width:205px}
  .hero-copy{padding:58px 0 44px}
  .chapter{margin-bottom:22px}
  .hero-copy h1{font-size:clamp(38px,11vw,54px)}
  .hero-copy .hero-text{font-size:14px}
  .hero-links{gap:18px}
  .hero-diagram{padding-bottom:52px}
  .hero-diagram::before{font-size:9px}
  .fact-row{grid-template-columns:1fr}
  .fact-item{padding:20px 18px;border-left:0;border-right:0!important;border-bottom:1px solid var(--line)}
  .fact-item:last-child{border-bottom:0}
  .editorial-intro{grid-template-columns:1fr;gap:30px}
  .editorial-index{position:static;display:flex;align-items:center;gap:14px}
  .editorial-index span{margin-top:0;font-size:44px}
  .service-index-row{grid-template-columns:1fr;gap:10px;padding:26px 4px}
  .service-index-row .num{font-size:24px}
  .service-index-row .aside{grid-column:auto;padding:12px 0 0;border-left:0;border-top:1px solid var(--line)}
  .statement-inner{padding:72px 0}
  .page-hero-grid{grid-template-columns:1fr;gap:18px;padding:58px 0 48px}
  .page-number{font-size:46px}
  .company-row{grid-template-columns:1fr;gap:6px;padding:16px 10px}
  .service-panel{grid-template-columns:1fr;min-height:auto}
  .service-panel .service-label{padding:24px 4px 12px;border-right:0}
  .service-panel .service-body,.service-panel:nth-child(even) .service-body{padding:0 4px 30px;background:transparent}
  .business-entry{grid-template-columns:1fr;gap:10px;padding:26px 8px}
  .business-entry aside{grid-column:auto;padding:12px 0 0;border-left:0;border-top:1px solid var(--line)}
  .contact-info{padding:26px 22px}
  .contact-form{padding:28px 18px}
  .form-grid{grid-template-columns:1fr}
  .contact-form .full{grid-column:auto}
  .form-actions{align-items:stretch;flex-direction:column}
  .form-actions .button{width:100%}
  .contact-cta-inner{grid-template-columns:1fr;gap:24px;padding:46px 0}
  .contact-cta .button{width:100%}
  .footer-main{grid-template-columns:1fr;gap:28px;padding-top:40px}
  .footer-nav{justify-content:flex-start}
  .footer-bottom{display:block}
  .footer-bottom p{margin:7px 0 0}
}