:root{--ink:#17202a;--muted:#53606c;--paper:#f7f4ec;--card:#fff;--line:#d8d2c4;--accent:#d85c3f;--blue:#234e70;--good:#176b52;--bad:#a33b31}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",sans-serif;line-height:1.75}.wrap{width:min(1080px,calc(100% - 40px));margin:auto}.hero{padding:88px 0 76px;background:linear-gradient(135deg,#132b3f,#234e70);color:#fff;border-bottom:8px solid var(--accent)}.eyebrow,.number,.label{font-weight:800;letter-spacing:.12em}.eyebrow{color:#ffd4c8}.hero h1{max-width:880px;margin:.2em 0;font-size:clamp(2.35rem,6vw,5.2rem);line-height:1.12;letter-spacing:-.035em}.lead{max-width:800px;font-size:1.18rem;color:#e9f0f5}.button{display:inline-block;margin-top:18px;padding:14px 22px;border-radius:4px;background:var(--accent);color:#fff;text-decoration:none;font-weight:800}.button:focus-visible{outline:3px solid #fff;outline-offset:4px}.note{font-size:.92rem;color:#d8e3ea}.section{padding:72px 0}.section-heading{display:grid;grid-template-columns:72px 1fr;gap:22px;align-items:start;margin-bottom:34px}.number{margin:0;color:var(--accent);font-size:1.1rem;border-top:3px solid var(--accent);padding-top:8px}.section h2{margin:0;font-size:clamp(1.8rem,4vw,3rem);line-height:1.25}.section-heading p{margin:.5em 0;color:var(--muted)}.checks{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.checks li{background:var(--card);border:1px solid var(--line);padding:26px;box-shadow:0 8px 24px rgba(25,32,38,.05)}.checks span{color:var(--accent);font-weight:800}.checks h3{margin:.35em 0;font-size:1.32rem}.checks p{margin:0;color:var(--muted)}.contrast{background:#e8edf0;border-block:1px solid #cbd4da}.examples{display:grid;grid-template-columns:1fr 1fr;gap:20px}.example{background:#fff;padding:28px;border-top:6px solid}.example.pass{border-color:var(--good)}.example.fail{border-color:var(--bad)}.label{margin:0}.pass .label,.pass .verdict{color:var(--good)}.fail .label,.fail .verdict{color:var(--bad)}.example h3{margin:.35em 0 1em}.example dl{margin:0}.example dl div{padding:10px 0;border-top:1px solid var(--line)}dt{font-weight:800}dd{margin:2px 0;color:var(--muted)}code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#f0eee8;padding:.1em .3em;border-radius:3px}.verdict{font-weight:900;font-size:1.12rem}.terminal{padding:20px 24px;background:#101820;color:#eaf3f8;font:1rem/1.7 ui-monospace,SFMono-Regular,Menlo,monospace;border-left:5px solid var(--accent);overflow:auto}.terminal span{color:#ff9a82}.boundaries{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:20px}.boundaries>div{padding:24px;border:1px solid var(--line);background:#fff}.boundaries h3{margin-top:0}.boundaries p{margin-bottom:0;color:var(--muted)}.cta{display:flex;justify-content:space-between;align-items:center;gap:30px;margin-top:38px;padding:30px;background:var(--accent);color:#fff}.cta h2{font-size:1.55rem}.cta p{margin-bottom:0}.button.dark{margin:0;background:#17202a;white-space:nowrap}footer{padding:28px 0;background:#17202a;color:#cbd3d9;font-size:.9rem}@media(max-width:720px){.hero{padding:58px 0}.section{padding:50px 0}.section-heading{grid-template-columns:1fr;gap:8px}.number{width:52px}.checks,.examples,.boundaries{grid-template-columns:1fr}.cta{align-items:flex-start;flex-direction:column}.button.dark{white-space:normal}}