:root{
  --bg:#ffffff; --ink:#1a1d23; --soft:#5b6270; --line:#e4e7ec; --panel:#f6f7f9; --brand:#d4231a; --brand-ink:#ffffff;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#101216; --ink:#eef0f3; --soft:#a3aab8; --line:#272b33; --panel:#171a20; --brand:#ff5a4f; --brand-ink:#101216; }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans JP","Noto Sans SC",sans-serif}
a{color:inherit}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header.site{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap}
.brand{font-weight:700;letter-spacing:.2px;text-decoration:none;font-size:18px}
.brand small{display:block;font-weight:400;font-size:12px;color:var(--soft);letter-spacing:0}
nav a{margin-left:20px;text-decoration:none;color:var(--soft);font-size:15px}
nav a:hover{color:var(--ink)}
.hero{padding:72px 0 56px}
.hero h1{font-size:clamp(30px,5vw,48px);line-height:1.15;margin:0 0 16px;letter-spacing:-.5px}
.hero p{max-width:62ch;color:var(--soft);font-size:18px;margin:0 0 24px}
.btn{display:inline-block;background:var(--brand);color:var(--brand-ink);padding:11px 20px;border-radius:8px;text-decoration:none;font-weight:600}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line);margin-left:8px}
section{padding:48px 0;border-top:1px solid var(--line)}
section h2{font-size:26px;margin:0 0 8px}
section>.wrap>p.lead{color:var(--soft);margin:0 0 28px;max-width:66ch}
.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}
.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.card img{display:block;width:100%;aspect-ratio:1/1;object-fit:cover;background:#fff}
.card .t{padding:14px 16px 16px;font-size:15px;font-weight:600}
.feat{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.feat div{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px}
.feat h3{margin:0 0 6px;font-size:17px}
.feat p{margin:0;color:var(--soft);font-size:15px}
.offices{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.offices div{border:1px solid var(--line);border-radius:12px;padding:18px}
.offices h3{margin:0 0 4px;font-size:17px}
.offices p{margin:0;color:var(--soft);font-size:14.5px;overflow-wrap:anywhere}
dl.contact{display:grid;grid-template-columns:max-content 1fr;gap:8px 20px;margin:0}
dl.contact dt{color:var(--soft)}
dl.contact dd{margin:0}
footer{border-top:1px solid var(--line);padding:28px 0 40px;color:var(--soft);font-size:14px}
footer .wrap{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.prose{max-width:72ch}
.prose h2{margin-top:32px}
@media (max-width:560px){ nav a{margin:0 14px 0 0} .btn.ghost{margin:10px 0 0} }