:root{--canvas:#F4F5F8;--surface:#FFFFFF;--text:#191A1D;--muted:#686A72;--brand:#4F6BD8;--border:#1218191E;}@media(prefers-color-scheme:dark){:root{--canvas:#0A1222;--surface:#1B2435;--text:#E7EBF3;--muted:#A1A8B5;--brand:#89A6FF;--border:#13FFFFFF;}}
*{box-sizing:border-box}html{color-scheme:light dark;scroll-behavior:smooth}body{margin:0;background:var(--canvas);color:var(--text);font:17px/1.8 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif}a{color:var(--brand);text-underline-offset:5px}a:focus-visible,summary:focus-visible{outline:3px solid var(--brand);outline-offset:5px}header,main,footer{width:min(1100px,calc(100% - 48px));margin:auto}header{padding:26px 0;display:flex;align-items:center;justify-content:space-between;gap:24px}.logo{font-size:25px;font-weight:750;text-decoration:none;color:var(--text);letter-spacing:-1px}nav{display:flex;gap:24px;flex-wrap:wrap}nav a{text-decoration:none;font-size:15px}.hero{padding:84px 0 64px;max-width:850px}.eyebrow{font-size:14px;color:var(--brand);font-weight:650;letter-spacing:.08em}h1{font-size:clamp(38px,6vw,68px);line-height:1.18;letter-spacing:-.04em;margin:20px 0 28px;font-weight:700}h2{font-size:29px;line-height:1.4;letter-spacing:-.02em;margin:0 0 18px}h3{font-size:20px;margin:0 0 10px}p{margin:0 0 20px}.lead{font-size:20px;color:var(--muted);max-width:690px}.actions{display:flex;align-items:center;gap:22px;margin:30px 0 18px;flex-wrap:wrap}.button{display:inline-block;background:var(--brand);color:#fff;text-decoration:none;border-radius:12px;padding:12px 24px;font-weight:650}.note{color:var(--muted);font-size:14px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-bottom:64px}.card{background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:28px}.card p{font-size:16px;color:var(--muted);margin:0}.section{padding:48px 0;border-top:1px solid var(--border)}.section>p{max-width:780px;color:var(--muted)}.steps{list-style:none;counter-reset:step;padding:0;display:grid;gap:16px}.steps li{counter-increment:step;background:var(--surface);padding:20px 24px;border-radius:14px}.steps li:before{content:counter(step) "　";color:var(--brand);font-weight:700}.help{max-width:800px;padding:48px 0 80px}.help h1{font-size:42px}details{padding:22px 0;border-bottom:1px solid var(--border)}summary{font-weight:650;cursor:pointer}details p{color:var(--muted);margin:16px 0 0}footer{border-top:1px solid var(--border);padding:28px 0 40px;color:var(--muted);font-size:14px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}@media(max-width:700px){header,main,footer{width:calc(100% - 32px)}header{align-items:flex-start}.hero{padding:48px 0}.grid{grid-template-columns:1fr;gap:14px;margin-bottom:36px}.card{padding:24px}nav{gap:16px}.lead{font-size:18px}}