:root{
  --ink:#0F1B2D; --ink-2:#2B3A50; --muted:#5A6779; --line:#DCE2EA; --bg:#FBFCFD; --tint:#F2F5F9;
  --accent:#0B409C; --accent-soft:#E6ECF6; --on-ink:#E8EDF4; --on-ink-muted:#A9B5C6;
  --radius:10px; --maxw:1160px;
  --font: "Inter","Noto Sans JP",system-ui,-apple-system,"Hiragino Sans",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.85;font-size:16px;letter-spacing:.02em;font-feature-settings:"palt" 1;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--accent)}
h1,h2,h3{line-height:1.4;margin:0;font-weight:700;letter-spacing:.03em}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}
.narrow>*{max-width:860px}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:#fff;padding:8px 12px;z-index:100}
.skip:focus{left:8px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(251,252,253,.86);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid rgba(220,226,234,.7)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:Inter,sans-serif;font-weight:600;font-size:19px;letter-spacing:.04em}
.brand img{width:28px;height:auto}
.nav{display:flex;align-items:center;gap:28px}
.nav a{color:var(--ink-2);text-decoration:none;font-size:14px;font-weight:500}
.nav a:hover{color:var(--accent)}
.nav .nav-en{font-family:Inter,sans-serif;font-size:13px;letter-spacing:.08em;border:1px solid var(--line);border-radius:999px;padding:2px 10px}
.nav-toggle{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer;position:relative}
.nav-toggle span{position:absolute;left:10px;right:10px;height:1.5px;background:var(--ink);transition:.2s}
.nav-toggle span:first-child{top:16px}.nav-toggle span:last-child{top:23px}
.nav-toggle[aria-expanded="true"] span:first-child{transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:last-child{transform:translateY(-3.5px) rotate(-45deg)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--ink);color:#fff !important;text-decoration:none;font-weight:500;font-size:15px;padding:14px 26px;border-radius:999px;border:1px solid var(--ink);transition:background .2s,border-color .2s}
.btn:hover{background:var(--accent);border-color:var(--accent)}
.btn-sm{padding:8px 18px;font-size:13.5px}
.btn-ghost{background:transparent;color:var(--ink) !important;border-color:#BFC8D4}
.btn-ghost:hover{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)!important}

/* hero */
.hero{position:relative;overflow:hidden;padding:132px 0 112px;border-bottom:1px solid var(--line);background:radial-gradient(1200px 600px at 85% 10%,#E9EFF8 0%,rgba(233,239,248,0) 60%),var(--bg)}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:64px 64px;opacity:.45;-webkit-mask-image:linear-gradient(100deg,transparent 30%,#000 75%);mask-image:linear-gradient(100deg,transparent 30%,#000 75%)}
.hero-motif{position:absolute;right:6%;top:50%;transform:translateY(-50%);width:400px;color:var(--accent);opacity:.55}
.hero-inner{position:relative}
.eyebrow{font-family:Inter,sans-serif;font-size:12.5px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:18px}
.hero h1{font-size:clamp(34px,5.2vw,60px);line-height:1.32;letter-spacing:.04em;font-weight:700;max-width:14em}
.lead{margin-top:28px;max-width:36em;color:var(--ink-2);font-size:17px;line-height:2}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:40px}
.hero-facts{display:flex;gap:48px;margin:64px 0 0;padding-top:28px;border-top:1px solid var(--line);max-width:620px}
.hero-facts div{display:flex;flex-direction:column}
.hero-facts dt{font-size:12px;color:var(--muted);letter-spacing:.1em}
.hero-facts dd{margin:2px 0 0;font-weight:500;font-size:15px}

/* sections */
.section{padding:120px 0}
.section-tint{background:var(--tint)}
.section-head{margin-bottom:56px}
.section-head h2,.contact h2,.en h2,.philosophy h2{font-size:clamp(26px,3vw,34px)}
.section-lead{margin-top:18px;color:var(--ink-2);max-width:40em}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:72px}
.col-title{font-size:15px;color:var(--muted);font-weight:500;letter-spacing:.1em;padding-bottom:16px;border-bottom:1px solid var(--line);margin-bottom:8px}
.issue-list li{display:flex;gap:20px;padding:24px 0;border-bottom:1px solid var(--line)}
.num{font-family:Inter,sans-serif;font-size:13px;font-weight:600;color:var(--accent);padding-top:3px;min-width:22px}
.issue-list strong,.principles strong{display:block;font-size:17px;margin-bottom:6px}
.issue-list p,.principles p{color:var(--ink-2);font-size:15px}
.principles li{position:relative;padding:24px 0 24px 28px;border-bottom:1px solid var(--line)}
.principles li::before{content:"";position:absolute;left:0;top:33px;width:12px;height:12px;border:1.5px solid var(--accent);transform:rotate(45deg)}

/* cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:36px 32px 32px;display:flex;flex-direction:column;transition:border-color .2s,transform .2s}
.card:hover{border-color:#B9C6DA;transform:translateY(-2px)}
.card-icon{width:48px;height:48px;fill:none;stroke:var(--accent);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;margin-bottom:28px}
.card-no{font-family:Inter,sans-serif;font-size:12.5px;color:var(--muted);letter-spacing:.12em;margin-bottom:6px}
.card h3{font-size:19px;margin-bottom:14px}
.card p{color:var(--ink-2);font-size:15px}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto;padding-top:24px}
.tags li{font-size:12.5px;color:var(--accent);background:var(--accent-soft);padding:3px 10px;border-radius:999px}
.note{margin-top:28px;font-size:13.5px;color:var(--muted)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;counter-reset:s;border-top:1px solid var(--ink)}
.steps li{padding:32px 28px 8px 0;position:relative}
.steps li:not(:last-child){border-right:1px solid var(--line);margin-right:28px}
.steps li::before{content:"";position:absolute;top:-5px;left:0;width:9px;height:9px;border-radius:50%;background:var(--accent)}
.step-no{font-family:Inter,sans-serif;font-size:12.5px;letter-spacing:.14em;color:var(--accent);font-weight:600}
.steps h3{font-size:19px;margin:10px 0 12px}
.steps p{font-size:15px;color:var(--ink-2)}

/* philosophy */
.section-ink{background:var(--ink);color:var(--on-ink);background-image:radial-gradient(900px 500px at 0% 0%,rgba(11,64,156,.35),transparent 60%)}
.section-ink .eyebrow{color:#8FB0E8}
.philosophy{display:grid;grid-template-columns:300px 1fr;gap:80px}
.philosophy h2{color:#fff}
blockquote{margin:0;padding:0 0 0 28px;border-left:1px solid rgba(255,255,255,.25)}
blockquote p{font-size:17px;line-height:2.1;color:var(--on-ink)}
blockquote p+p{margin-top:20px}
.profile-title{font-size:14px;letter-spacing:.12em;color:var(--on-ink-muted);font-weight:500;margin:48px 0 12px}
.profile li{padding:14px 0 14px 22px;border-top:1px solid rgba(255,255,255,.12);font-size:15px;position:relative;color:var(--on-ink)}
.profile li::before{content:"";position:absolute;left:0;top:27px;width:8px;height:1px;background:#8FB0E8}

.about-text{font-size:17px;line-height:2.1;color:var(--ink-2);max-width:30em}
.section-ink .section-lead{color:var(--on-ink)}
.section-ink h2{color:#fff}

/* company */
.company-table{margin:0;border-top:1px solid var(--ink)}
.company-table>div{display:grid;grid-template-columns:180px 1fr;border-bottom:1px solid var(--line);padding:22px 0}
.company-table dt{color:var(--muted);font-size:14.5px}
.company-table dd{margin:0;font-size:15.5px}
.company-table dd li{position:relative;padding-left:16px}
.company-table dd li::before{content:"";position:absolute;left:0;top:.95em;width:6px;height:1px;background:var(--ink-2)}

.more-link{margin-top:28px;font-size:14.5px}
.more-link a{font-weight:500;text-decoration:none}
.more-link a:hover{text-decoration:underline}

/* sub page */
.page-head{padding:88px 0 56px;border-bottom:1px solid var(--line);background:radial-gradient(900px 420px at 85% 0%,#E9EFF8 0%,rgba(233,239,248,0) 60%),var(--bg)}
.page-head h1{font-size:clamp(30px,3.6vw,42px)}
.breadcrumb{display:flex;gap:10px;font-size:13px;color:var(--muted);margin-bottom:28px}
.breadcrumb a{color:var(--muted);text-decoration:none}
.breadcrumb a:hover{color:var(--accent)}
.section-compact{padding:72px 0 120px}
.nav a[aria-current="page"]{color:var(--accent)}

/* contact */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center}
.contact-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:44px}
.contact-label{font-size:13px;color:var(--muted);letter-spacing:.08em}
.contact-mail{display:block;font-family:Inter,sans-serif;font-size:clamp(22px,2.4vw,28px);font-weight:500;color:var(--ink);text-decoration:none;margin:6px 0 10px;word-break:break-all}
.contact-mail:hover{color:var(--accent)}
.contact-hint{font-size:14px;color:var(--ink-2);margin-bottom:28px}

/* en */
.en{border-top:1px solid var(--line)}
.en h2{font-family:Inter,sans-serif;letter-spacing:-.01em;margin-bottom:24px}
.en p{color:var(--ink-2);font-family:Inter,sans-serif;letter-spacing:0;line-height:1.75}
.en p+p{margin-top:16px}

/* footer */
.site-footer{background:var(--ink);color:var(--on-ink-muted);padding:40px 0;font-size:13px}
.footer-inner{display:flex;justify-content:space-between;align-items:center}
.brand-light{color:#fff;font-size:17px}
.brand-light img{filter:brightness(0) invert(1);opacity:.9;width:24px}

/* responsive */
@media (max-width:1080px){
  .hero-motif{width:300px;right:-40px;opacity:.3}
  .steps{grid-template-columns:1fr 1fr;border-top:0}
  .steps li{border-top:1px solid var(--ink);margin-right:0!important;border-right:0!important;padding-right:24px}
  .steps li:nth-child(odd){margin-right:0}
  .steps{column-gap:32px}
}
@media (max-width:900px){
  .nav-toggle{display:block}
  .nav{position:absolute;top:68px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:var(--bg);border-bottom:1px solid var(--line);padding:8px 24px 24px;display:none}
  .nav.open{display:flex}
  .nav a{padding:14px 0;border-bottom:1px solid var(--line);font-size:15px}
  .nav .nav-en{border:0;border-bottom:1px solid var(--line);border-radius:0;padding:14px 0}
  .nav .btn{margin-top:16px;border-bottom:0;padding:12px}
  .two-col,.contact,.philosophy{grid-template-columns:1fr;gap:48px}
  .cards{grid-template-columns:1fr}
}
@media (max-width:600px){
  body{font-size:15px}
  .wrap{padding:0 22px}
  .hero{padding:80px 0 72px}
  .hero-motif{display:none}
  .hero h1{font-size:32px}
  .lead{font-size:15.5px}
  .hero-cta .btn{flex:1 1 100%}
  .hero-facts{gap:24px;flex-wrap:wrap;margin-top:48px}
  .section{padding:80px 0}
  .section-head{margin-bottom:36px}
  .page-head{padding:56px 0 40px}
  .section-compact{padding:48px 0 80px}
  .steps{grid-template-columns:1fr}
  .company-table>div{grid-template-columns:1fr;gap:4px;padding:18px 0}
  .contact-box{padding:28px 24px}
  .card{padding:28px 24px}
  blockquote{padding-left:18px}
  blockquote p{font-size:15.5px}
  .about-text{font-size:15.5px}
  .footer-inner{flex-direction:column;gap:12px;align-items:flex-start}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}