/* track:CONTROLLED_IMPROVEMENT */
:root{--bg:#fff3dc;--ink:#332719;--accent:#c47a18;--surface:#fffdf7;--line:#e3c99c;--panel:#fffdf7}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.78}a{color:var(--accent);text-decoration:none}header{display:flex;justify-content:space-between;align-items:center;gap:2rem;padding:1.1rem 4vw;background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:3}.brand{font-weight:900;color:var(--ink)}.brand small{display:block;color:var(--accent);font-size:.62rem;letter-spacing:.12em}nav{display:flex;gap:1rem;flex-wrap:wrap}main{width:min(1040px,92vw);margin:auto}.hero{padding:6rem 0 4rem}.eyebrow{font-size:.72rem;letter-spacing:.15em;font-weight:900;color:var(--accent)}h1{font-size:clamp(3rem,9vw,6.8rem);line-height:.95;letter-spacing:-.05em;margin:.5rem 0 1.4rem}h2{font-size:clamp(1.8rem,4vw,3rem);line-height:1.15;margin:.2rem 0 1.2rem}.lead{font-size:1.18rem;max-width:880px}.intent{font-weight:800;max-width:880px}.notice{margin:1.4rem 0;padding:1rem 1.2rem;border-left:5px solid var(--accent);background:var(--surface)}.topic-map{display:flex;gap:.6rem;flex-wrap:wrap;margin:1.2rem 0}.topic-map a{background:var(--surface);border:1px solid var(--line);padding:.45rem .7rem}.track-panel{padding:1.4rem;margin:2rem 0 0;background:var(--panel);border:1px solid var(--line)}.track-panel ul{display:grid;grid-template-columns:repeat(3,1fr);gap:.8rem;padding:0;list-style:none}.track-panel li{background:var(--surface);padding:.8rem;border:1px solid var(--line)}.answer{padding:4rem 0;border-top:1px solid var(--line)}.answer-head{display:grid;grid-template-columns:70px 1fr;gap:1rem}.answer-head span{font-size:2.6rem;color:var(--accent);font-weight:900}.answer-copy{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}.answer-copy p{margin:0;padding:1.2rem;background:var(--surface);border:1px solid var(--line)}.checklist{display:flex;gap:.6rem;flex-wrap:wrap;margin-top:1.2rem}.checklist span{padding:.35rem .65rem;border:1px solid var(--accent);border-radius:99px}.depth-note{padding:4rem 0;border-top:1px solid var(--line)}.depth-copy{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}.depth-copy p{margin:0;padding:1.2rem;background:var(--surface);border-top:4px solid var(--accent)}.faq{padding:4rem 0}.faq details{padding:1rem 0;border-top:1px solid var(--line)}summary{font-weight:850;cursor:pointer}footer{display:flex;justify-content:space-between;gap:2rem;padding:2.5rem 4vw;background:var(--ink);color:var(--bg)}footer a{color:var(--bg)}.support-page{max-width:760px;margin:5rem auto;padding:2.5rem;background:var(--surface);border:1px solid var(--line)}.support-page h1{font-size:2.8rem}.evidence-matrix{border-width:3px;box-shadow:8px 8px 0 var(--line)}.evidence-matrix li:before{content:"✓ ";color:var(--accent);font-weight:900}.verification-workbench{border:3px double var(--accent);background:linear-gradient(135deg,var(--panel),var(--surface))}.verification-workbench li:before{content:"□ ";color:var(--accent);font-weight:900}.verification-workbench li{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.editorial-baseline{border-left:7px solid var(--accent)}@media(max-width:760px){header,footer{display:block;position:static}header nav{margin-top:.7rem}.hero{padding-top:3.5rem}.track-panel ul,.answer-copy,.depth-copy{grid-template-columns:1fr}.answer-head{grid-template-columns:1fr}.answer-head span{font-size:1rem}}