:root{--ink:#142f35;--muted:#536569;--paper:#f6f5ef;--line:#d7ddd4;--green:#d4ec83;--dark:#103d36;--white:#fff;--accent:#26775b;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-size:16px}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-underline-offset:4px}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid #367dba;outline-offset:5px}header{max-width:1240px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:27px 36px;border-bottom:1px solid var(--line);gap:24px}.brand{font-size:23px;font-weight:800;letter-spacing:-1px;text-decoration:none;white-space:nowrap}.brand span{display:inline-block;background:var(--green);border:1px solid var(--ink);border-radius:50%;width:21px;height:21px;margin-right:9px;vertical-align:-2px}nav{display:flex;gap:26px;flex-wrap:wrap}nav a{font-size:14px;text-decoration:none;color:var(--muted);padding:8px 0}nav a[aria-current]{color:var(--ink);box-shadow:0 2px var(--accent)}main{max-width:1240px;margin:auto;padding:0 36px 72px}.hero{display:grid;grid-template-columns:1.15fr 1fr;gap:65px;padding:74px 0 65px;align-items:center}.eyebrow{font-family:monospace;letter-spacing:1.5px;text-transform:uppercase;font-size:12px;color:var(--accent);font-weight:bold}h1{font-size:clamp(42px,5.7vw,76px);line-height:1.03;letter-spacing:-3.5px;margin:22px 0 25px;max-width:760px}h2{font-size:34px;letter-spacing:-1.1px;line-height:1.15;margin:16px 0 20px}h3{font-size:20px;margin:8px 0 13px;letter-spacing:-.4px}p{line-height:1.75;color:var(--muted);max-width:67ch}.lead{font-size:18px;line-height:1.65}.button{display:inline-block;background:var(--ink);color:white;border:0;padding:16px 22px;font:600 14px Arial;border-radius:4px;text-decoration:none;cursor:pointer}.button.light{background:var(--green);color:var(--ink)}.actions{display:flex;align-items:center;gap:25px;margin-top:30px;flex-wrap:wrap}.text-link{font-size:14px;font-weight:bold}.visual{background:var(--dark);border-radius:8px;padding:28px;color:#edf5e9;min-height:380px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}.visual::before{content:'';position:absolute;inset:0;background-image:radial-gradient(#ffffff16 1px,transparent 1px);background-size:22px 22px;pointer-events:none}.visual>*{position:relative}.visual-label{font:11px monospace;text-transform:uppercase;letter-spacing:1.6px;color:#bdd8c9}.path{display:flex;align-items:center;flex-direction:column;gap:8px;padding:20px 0}.node{border:1px solid #6b8b79;padding:13px 22px;border-radius:5px;min-width:220px;display:flex;justify-content:space-between;gap:22px;align-items:center;font-size:14px}.node strong{font-size:14px}.node small{font:10px monospace;color:#bbd4c5}.node.active{background:var(--green);color:var(--ink);border-color:var(--green)}.node.active small{color:#345543}.arrow{color:#b6cfbd;font:16px monospace}.caption{font:11px monospace;line-height:1.6;color:#bbd4c5}.section-head{border-top:1px solid var(--line);padding-top:32px;display:flex;align-items:baseline;justify-content:space-between;gap:25px}.section-head p{font-size:14px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px;margin-top:26px}.card{border-top:2px solid var(--ink);padding:23px 0}.number{font:12px monospace;color:var(--accent);display:block;margin-bottom:25px}.card p{font-size:15px}.card a{font-size:14px;font-weight:bold}.band{display:flex;background:var(--green);border-radius:6px;padding:35px 38px;justify-content:space-between;align-items:center;gap:30px;margin-top:45px}.band h2{font-size:27px;margin:0 0 8px}.band p{margin:0}.page-head{padding:65px 0 38px}.page-head h1{font-size:clamp(42px,5vw,62px)}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:55px}.step{border-top:1px solid var(--line);padding:24px 0}.step p{margin:10px 0}.step .number{margin-bottom:10px}.note{background:#e8ece4;border-left:3px solid var(--accent);padding:22px 26px;margin:30px 0}.note p{margin:0;font-size:15px}code{font-family:monospace;font-size:.9em;background:#e8ece4;padding:2px 5px;overflow-wrap:anywhere}footer{max-width:1240px;margin:auto;padding:26px 36px 34px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;font-size:12px;color:var(--muted)}.flow-wide{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:30px 0}.flow-step{background:#e7ecdf;padding:24px;border:1px solid var(--line);border-radius:5px}.flow-step p{font-size:14px}.flow-step .number{margin-bottom:17px}.lab{background:white;border:1px solid var(--line);border-radius:7px;padding:32px;margin-bottom:24px}.choices{display:flex;flex-direction:column;gap:12px;margin:24px 0}.choice{text-align:left;border:1px solid var(--line);background:var(--paper);border-radius:4px;padding:16px;font-size:15px;cursor:pointer;color:var(--ink)}.choice:hover{border-color:var(--accent)}.choice[aria-pressed=true]{background:#d4ec83;border-color:#26775b}.feedback{min-height:58px;line-height:1.6;color:var(--ink);padding:15px 0}.progress{width:100%;accent-color:var(--accent);height:15px}.check{display:flex;align-items:start;gap:12px;padding:16px 0;border-bottom:1px solid var(--line);line-height:1.55;cursor:pointer}.check input{margin-top:5px;accent-color:var(--accent);width:18px;height:18px}.skip{position:absolute;top:-80px;left:15px;background:var(--ink);color:white;padding:15px;z-index:10}.skip:focus{top:10px}.error{text-align:center;padding:90px 0}.error h1{margin:20px auto}.error p{margin:25px auto}.tiny{font-size:13px}.diagram{width:100%;height:auto}.diagram text{font-family:Arial,sans-serif}.topic-label{display:inline-block;font:11px monospace;border:1px solid var(--line);border-radius:20px;padding:7px 12px;margin-bottom:18px}
@media(max-width:800px){header{align-items:start;padding:22px;flex-direction:column;gap:15px}nav{gap:20px}main{padding:0 22px 45px}.hero{grid-template-columns:1fr;gap:30px;padding:44px 0}.visual{min-height:350px}h1{letter-spacing:-2px}.grid,.two-col{grid-template-columns:1fr;gap:15px}.flow-wide{grid-template-columns:1fr 1fr}.section-head{align-items:start;flex-direction:column;gap:0}.band{padding:25px;align-items:start;flex-direction:column}footer{padding:22px;flex-direction:column}.page-head{padding-top:42px}.lab{padding:23px}}@media(prefers-reduced-motion:no-preference){a,button{transition:background .15s,border-color .15s}}