:root{
  --bg:#F6F5F2;--surface:#FFFFFF;--ink:#171A1F;--muted:#5C6470;--line:#DDD9D2;--line-soft:#ECE9E3;
  --accent:#0E6E7A;--accent-ink:#0A525B;--accent-soft:#E1F0F1;
  --radius:8px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Manrope",system-ui,-apple-system,"Hiragino Sans","Noto Sans JP",sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:"Bricolage Grotesque","Manrope",system-ui,sans-serif;line-height:1.15;margin:0;text-wrap:balance;letter-spacing:-.015em}
h1{font-size:clamp(34px,5vw,54px);font-weight:700}
h2{font-size:clamp(24px,3vw,32px);font-weight:700}
h3{font-size:18px;font-weight:700}
p{margin:0 0 14px;max-width:64ch}
a{color:var(--accent-ink);text-decoration:none}
a:hover,a:focus-visible{text-decoration:underline;outline:none}
.wrap{max-width:1040px;margin:0 auto;padding:0 24px}
.eyebrow{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:700}

/* header */
header.site{position:sticky;top:0;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line-soft);z-index:10}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-family:"Bricolage Grotesque",sans-serif;font-weight:700;font-size:20px;color:var(--ink);letter-spacing:-.01em}
.brand svg{width:26px;height:26px}
nav.main{display:flex;gap:22px;font-size:14px;font-weight:600}
nav.main a{color:var(--ink)}
nav.main a.cta{background:var(--ink);color:#fff;padding:8px 14px;border-radius:999px}
nav.main a.cta:hover{background:var(--accent-ink);text-decoration:none}
@media (max-width:640px){nav.main{gap:14px}nav.main a:not(.cta){display:none}}

/* hero */
.hero{padding:88px 0 56px}
.hero p.lead{font-size:20px;color:var(--muted);max-width:56ch;margin:20px 0 28px}
.hero .actions{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 20px;border-radius:999px;font-weight:700;font-size:15px;border:1px solid var(--ink);color:var(--ink)}
.btn.primary{background:var(--ink);color:#fff}
.btn.primary:hover{background:var(--accent-ink);border-color:var(--accent-ink);text-decoration:none}
.btn:hover{text-decoration:none;background:var(--surface)}
.networks{margin-top:44px;display:flex;flex-wrap:wrap;gap:8px 10px;align-items:center;color:var(--muted);font-size:14px}
.networks span.chip{border:1px solid var(--line);background:var(--surface);padding:5px 12px;border-radius:999px;color:var(--ink);font-weight:600}

/* diagram */
.cast{margin:40px 0 0;padding:28px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow-x:auto}
.cast svg{display:block;width:100%;max-width:820px;height:auto;margin:0 auto}

/* sections */
section{padding:56px 0}
section + section{border-top:1px solid var(--line-soft)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:20px;margin-top:28px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card h3{margin-bottom:8px}
.card p{font-size:15px;color:var(--muted);margin:0}
.steps{counter-reset:s;display:grid;gap:14px;margin:28px 0 0;padding:0;list-style:none;max-width:720px}
.steps li{display:grid;grid-template-columns:36px 1fr;gap:14px;align-items:start}
.steps li::before{counter-increment:s;content:counter(s);width:32px;height:32px;border-radius:50%;background:var(--accent-soft);color:var(--accent-ink);font-weight:700;display:flex;align-items:center;justify-content:center;font-family:"Bricolage Grotesque",sans-serif}
.steps strong{display:block}
.steps span{color:var(--muted);font-size:15px}
.note{border-left:3px solid var(--accent);background:var(--accent-soft);padding:14px 18px;border-radius:0 var(--radius) var(--radius) 0;font-size:15px;max-width:720px}

/* legal pages */
.legal{padding:64px 0 80px;max-width:760px}
.legal h1{font-size:clamp(30px,4vw,40px);margin-bottom:6px}
.legal .meta{color:var(--muted);font-size:14px;margin-bottom:36px}
.legal h2{font-size:22px;margin:40px 0 12px}
.legal h3{font-size:17px;margin:24px 0 8px}
.legal ul{padding-left:22px;margin:0 0 14px}
.legal li{margin:4px 0}
.legal table{border-collapse:collapse;width:100%;font-size:15px;margin:12px 0 20px}
.legal th,.legal td{text-align:left;vertical-align:top;padding:8px 10px;border-bottom:1px solid var(--line-soft)}
.legal th{font-weight:700;background:var(--surface)}

/* footer */
footer.site{border-top:1px solid var(--line);padding:36px 0 48px;font-size:14px;color:var(--muted)}
footer.site .wrap{display:flex;flex-wrap:wrap;gap:16px 40px;justify-content:space-between;align-items:flex-start}
footer.site nav{display:flex;gap:18px;flex-wrap:wrap}
footer.site nav a{color:var(--ink)}
footer.site .co{line-height:1.6}