:root{color-scheme:light;--ink:#15283b;--muted:#53677a;--blue:#1856a8;--line:#d9e3ed;--paper:#fff;--wash:#f3f7fb}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI","Noto Sans JP","Yu Gothic",sans-serif;font-size:16px;line-height:1.9}a{color:var(--blue);text-underline-offset:.22em}a:hover{text-decoration-thickness:2px}a:focus-visible{outline:3px solid #8ebaf1;outline-offset:5px;border-radius:2px}.skip{position:absolute;left:16px;top:-100px;background:white;padding:8px 16px;z-index:2}.skip:focus{top:12px}.wrap{width:min(100% - 48px,960px);margin:auto}header{border-bottom:1px solid var(--line)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:88px}.brand{font-size:25px;font-weight:750;letter-spacing:-.035em;text-decoration:none;color:var(--ink)}nav{display:flex;gap:24px;flex-wrap:wrap;font-size:14px}nav a{color:var(--muted);text-decoration:none}nav a[aria-current=page]{color:var(--blue);font-weight:700}main{padding:64px 0 80px}.eyebrow{color:var(--blue);font-size:13px;font-weight:750;letter-spacing:.12em;margin:0 0 16px}h1{font-size:clamp(30px,4.8vw,48px);line-height:1.4;letter-spacing:-.025em;max-width:800px;margin:0 0 26px}h2{font-size:23px;line-height:1.5;letter-spacing:-.015em;margin:0 0 16px}h3{font-size:17px;margin:26px 0 8px}p{margin:0 0 20px}.lead{font-size:19px;color:var(--muted);max-width:740px}.note{background:var(--wash);border-left:3px solid var(--blue);padding:22px 26px;margin:36px 0}.note p:last-child{margin-bottom:0}.note strong{font-weight:700}section{padding:32px 0;border-top:1px solid var(--line);max-width:800px}.intro{padding:0 0 32px;border:0}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin:30px 0 0;counter-reset:steps}.step{counter-increment:steps;border-top:2px solid var(--blue);padding-top:16px}.step:before{content:"0" counter(steps);display:block;color:var(--blue);font-size:13px;font-weight:700;letter-spacing:.06em}.step h3{margin:8px 0}.step p{font-size:15px;color:var(--muted);margin-bottom:0}.links{display:flex;gap:24px;flex-wrap:wrap;margin-top:24px}.date{font-size:14px;color:var(--muted);margin-bottom:36px}ul{padding-left:1.5em;margin:0 0 20px}li{margin:8px 0}footer{padding:30px 0 40px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.footer-inner{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}.footer-inner p{margin:0}.footer-links{display:flex;gap:20px;flex-wrap:wrap}code{font-family:ui-monospace,monospace;font-size:.9em;overflow-wrap:anywhere;background:var(--wash);padding:2px 5px;border-radius:3px}@media(max-width:620px){.wrap{width:calc(100% - 36px)}.header-inner{align-items:flex-start;flex-direction:column;gap:12px;padding:20px 0}nav{gap:10px 18px;font-size:13px}main{padding:42px 0 58px}.lead{font-size:17px}.steps{grid-template-columns:1fr;gap:22px}.note{padding:18px 20px}section{padding:27px 0}h2{font-size:21px}}