@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=Noto+Sans+JP:wght@400;500;700&display=swap');
:root{color-scheme:dark;--bg:#091114;--surface:#111e23;--line:#2c4148;--text:#dce6e6;--muted:#a3b8bd;--green:#86d6bf;--red:#ef9c91;--blue:#8cc9ec;--amber:#e8c182;font-synthesis:none;scroll-behavior:smooth}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.95 'Noto Sans JP',sans-serif}a{color:var(--green);text-underline-offset:4px;overflow-wrap:anywhere}a:hover{color:#c2f3e5}a:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--amber);outline-offset:5px}p{margin:1em 0}h1,h2,h3{line-height:1.55;font-weight:500}h1{font-size:clamp(34px,5vw,60px);letter-spacing:.03em;margin:16px 0 24px}h2{font-size:clamp(23px,3vw,31px);margin:8px 0 22px}h3{font-size:17px;color:var(--blue);margin:14px 0}strong{font-weight:700;color:#ecf2f2}li+li{margin-top:10px}ul,ol{padding-left:1.5em}.site-header{display:flex;justify-content:space-between;align-items:center;gap:15px;padding:21px max(24px,calc((100vw - 1340px)/2));border-bottom:1px solid var(--line);background:#101b20}.brand{font:600 19px/1.5 'IBM Plex Mono',monospace;text-decoration:none;color:var(--text)}.brand small{display:block;font-size:10px;letter-spacing:2px;color:var(--muted)}.return-link{display:inline-block;text-decoration:none;background:#17382f;border:1px solid #508d7e;border-radius:4px;padding:10px 16px;font-size:13px}.book-layout{max-width:1340px;display:grid;grid-template-columns:220px minmax(0,1fr);gap:55px;margin:auto;padding:52px 24px}.contents{position:sticky;top:24px;align-self:start;font-size:13px;padding-top:9px}.contents p,.eyebrow{font:11px/1.7 'IBM Plex Mono',monospace;letter-spacing:1px;color:var(--green)}.contents p{margin:0 0 20px}.contents ol{padding-left:22px;margin-bottom:25px}.contents li{padding-left:5px;margin-bottom:13px;color:var(--muted)}.contents a{text-decoration:none;color:var(--muted)}.contents a:hover{color:var(--green)}main{min-width:0;max-width:990px}.book-title{padding-bottom:35px}.lead{font-size:18px;max-width:720px;color:#bdd0d2}.notice{padding:19px 22px;border-left:3px solid var(--green);background:#142a29;color:#c7dbd6;font-size:14px}.notice p:last-child{margin-bottom:0}section{border-top:1px solid var(--line);padding:37px 0 40px;scroll-margin-top:25px}.steps li{margin-bottom:16px}.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:24px 0}.card-grid article,.example-card{min-width:0;border:1px solid var(--line);background:var(--surface);padding:23px;border-radius:5px;overflow-wrap:anywhere}.card-grid p{font-size:14px;margin:10px 0}.card-grid h3{margin-top:8px}.tag{font:11px/1.7 'IBM Plex Mono',monospace;letter-spacing:.5px;color:var(--green)}.card-grid dl{font-size:13px}.card-grid dt{margin-top:14px;color:var(--muted)}.card-grid dd{margin:4px 0}.card-grid .safe{color:var(--green)}.card-grid .unsafe{color:var(--red)}.source-link{font-size:12px}.chips{display:flex;flex-wrap:wrap;gap:10px}.chips p{font-size:13px;padding:9px 13px;margin:0;background:#15292e;border:1px solid var(--line)}.data-status{font-size:13px;color:var(--muted)}.example-list{display:grid;gap:20px;margin:24px 0}.example-card h3{margin:0 0 15px}.example-pair{display:grid;grid-template-columns:1fr 1fr;gap:20px}.example-pair>div{padding:16px;background:#0c191e;border-top:2px solid var(--green);min-width:0}.example-pair>div+div{border-color:var(--red)}.example-pair h4{margin:0;color:var(--green);font-size:14px}.example-pair>div+div h4{color:var(--red)}.example-pair p{font-size:13px;margin:10px 0}.example-pair small{display:block;font-size:12px;color:var(--muted);line-height:1.9}.impact-list{display:grid;grid-template-columns:1fr 1fr;gap:14px}.impact-list>div{padding:16px;background:var(--surface);border:1px solid var(--line)}.impact-list dt{color:var(--amber);font-size:14px}.impact-list dd{font-size:13px;margin:8px 0 0}.snapshots{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.snapshots figure{margin:0;min-width:0}.snapshots canvas{display:block;width:100%;height:auto;image-rendering:pixelated;border:1px solid var(--line);background:#0a171c}.snapshots figcaption{font-size:12px;color:var(--muted);margin-top:9px}.source-list li{font-size:14px}footer{padding:30px 0;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px}footer p{flex-basis:100%;color:var(--muted);font-size:11px;margin-top:8px}.skip{position:absolute;top:10px;left:10px;transform:translateY(-200%);background:var(--bg);padding:12px;z-index:2}.skip:focus{transform:none}
.example-pair>.valid-example{border-color:var(--green)}.example-pair>.valid-example h4{color:var(--green)}
@media(max-width:1050px){.book-layout{grid-template-columns:180px minmax(0,1fr);gap:30px}.card-grid article,.example-card{padding:18px}}
@media(max-width:760px){body{font-size:14px}.site-header{padding:17px 16px}.brand{font-size:16px}.brand small{font-size:9px}.return-link{padding:8px 11px;font-size:12px}.book-layout{display:block;padding:25px 18px}.contents{position:static;padding:14px 0 25px;border-bottom:1px solid var(--line);margin-bottom:30px}.contents ol{display:grid;grid-template-columns:1fr 1fr;gap:8px 20px;margin:10px 0 18px}.contents li{font-size:12px;margin:0}.book-title{padding-bottom:20px}.lead{font-size:16px}.card-grid,.example-pair{grid-template-columns:1fr}.card-grid{gap:13px}.example-pair{gap:12px}.notice{padding:16px;font-size:13px}.impact-list{grid-template-columns:1fr}.snapshots{gap:8px}.snapshots figcaption{font-size:11px}section{padding:28px 0 30px}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}}