:root{color-scheme:light;--ink:#1a2928;--muted:#53625e;--paper:#f8f8f2;--accent:#155a47;--line:#d8ded5}
*{box-sizing:border-box}html{font-family:"Noto Sans JP","Yu Gothic",Meiryo,sans-serif;line-height:1.9;color:var(--ink);background:var(--paper)}body{margin:0}a{color:var(--accent);text-underline-offset:4px}a:hover{text-decoration-thickness:2px}a:focus-visible{outline:3px solid #b77c16;outline-offset:5px}p{margin:0 0 1.2em}h1,h2,h3{line-height:1.55;letter-spacing:.025em}h1{font-size:clamp(2.4rem,5vw,4rem);margin:.25em 0 .5em;font-weight:700}h2{font-size:1.35rem;margin:0 0 1.4rem}h3{font-size:1.1rem;margin:0 0 .4rem}.header,main,footer{max-width:1040px;margin:0 auto;padding-left:36px;padding-right:36px}.header{display:flex;justify-content:space-between;align-items:center;gap:20px;min-height:100px;border-bottom:1px solid var(--line)}.brand{font-weight:700;font-size:1.1rem;letter-spacing:.08em;text-decoration:none;color:var(--ink)}nav{display:flex;gap:24px;font-size:.9rem}.intro{padding:76px 0 66px;max-width:760px}.eyebrow{font-size:.82rem;color:var(--accent);letter-spacing:.13em;font-weight:700;margin-bottom:1.5rem}.lead{font-size:1.08rem;max-width:680px}.button{display:inline-flex;align-items:center;gap:34px;background:var(--accent);color:white;padding:11px 20px;text-decoration:none;font-size:.95rem;margin-top:8px}.section{border-top:1px solid var(--line);padding:42px 0}.steps{list-style:none;padding:0;margin:0}.steps li{display:flex;gap:28px;padding:18px 0}.steps p{margin:0;color:var(--muted)}.number{font-size:.8rem;padding-top:5px;color:var(--accent);font-weight:700;letter-spacing:.1em}.split{display:grid;grid-template-columns:1fr 2fr;gap:40px}.split p:last-child{margin-bottom:0}footer{border-top:1px solid var(--line);padding-top:28px;padding-bottom:36px;display:flex;justify-content:space-between;gap:24px;font-size:.8rem;color:var(--muted)}footer div{display:flex;flex-wrap:wrap;gap:20px}.document{max-width:880px;padding-top:54px;padding-bottom:54px}.document h1{font-size:clamp(1.8rem,4vw,2.7rem);overflow-wrap:anywhere}.date{font-size:.8rem;color:var(--muted);margin-bottom:34px}.document section{padding-top:25px}.document h2{margin-bottom:14px}.document li{margin-bottom:12px}.document ul{padding-left:1.5em}code{overflow-wrap:anywhere;font-size:.9em}strong{font-weight:700}nav [aria-current]{font-weight:700}
@media(max-width:640px){.header,main,footer{padding-left:22px;padding-right:22px}.header{min-height:86px;gap:12px}.brand{font-size:.94rem}nav{gap:13px;font-size:.78rem}.intro{padding:48px 0}.lead{font-size:1rem}.split{grid-template-columns:1fr;gap:4px}.section{padding:30px 0}.steps li{gap:18px}footer{flex-direction:column;padding-top:24px}footer div{gap:14px}.document{padding-top:36px}.document h1{font-size:1.8rem}.document h2{font-size:1.17rem}}