:root{--bg:#eef2f4;--surface:#fff;--text:#10181f;--text-soft:#4b5a63;--text-faint:#74828a;--line:#10181f1f;--line-strong:#10181f38;--copper:#b5691f;--copper-deep:#8c4f16;--copper-soft:#b5691f1a;--shadow:0 1px 2px #10181f0f, 0 8px 24px #10181f0f;--font-display:"Iowan Old Style","Palatino Linotype","Book Antiqua", Georgia, "Sitka Text", serif;--font-body:"Segoe UI", Charter, -apple-system, system-ui, "Helvetica Neue", sans-serif}@media (prefers-color-scheme:dark){:root{--bg:#0a1116;--surface:#121d26;--text:#e7ecee;--text-soft:#a6b4bb;--text-faint:#7c8a91;--line:#e7ecee24;--line-strong:#e7ecee3d;--copper:#e2954c;--copper-deep:#f0ac6b;--copper-soft:#e2954c29;--shadow:0 1px 2px #0000004d, 0 12px 32px #00000059}}*{box-sizing:border-box}html{background:var(--bg)}body{background:var(--bg);color:var(--text);font-family:var(--font-body);-webkit-font-smoothing:antialiased;margin:0;font-size:17px;line-height:1.6}a{color:inherit}h1,h2,h3{font-family:var(--font-display);text-wrap:balance;margin:0;font-weight:600}h1{letter-spacing:-.02em}h2{letter-spacing:-.015em}h3{letter-spacing:-.01em}:focus-visible{outline:2px solid var(--copper);outline-offset:3px}.container{max-width:1080px;margin:0 auto;padding:0 32px}section{border-bottom:1px solid var(--line);padding:96px 0}section:last-of-type{border-bottom:none}header.site{z-index:20;background:color-mix(in srgb, var(--bg) 92%, transparent);border-bottom:1px solid var(--line);position:sticky;top:0}.nav-inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;max-width:1080px;margin:0 auto;padding:20px 32px;display:flex}.wordmark{align-items:baseline;gap:12px;text-decoration:none;display:flex}.wordmark .mark{font-family:var(--font-display);letter-spacing:-.01em;color:var(--text);font-size:22px;font-weight:600}.wordmark .tag{font-family:var(--font-body);color:var(--text-faint);font-size:12px;display:none}@media (min-width:640px){.wordmark .tag{display:inline}}nav.links{color:var(--text-soft);gap:28px;font-size:15px;display:none}nav.links a{text-decoration:none}nav.links a:hover{color:var(--copper)}@media (min-width:780px){nav.links{display:flex}}.btn{font-family:var(--font-body);border:1px solid var(--line-strong);white-space:nowrap;min-height:40px;color:var(--text);cursor:pointer;background:0 0;border-radius:4px;justify-content:center;align-items:center;padding:12px 20px;font-size:15px;font-weight:600;text-decoration:none;transition:background-color .12s,border-color .12s,color .12s;display:inline-flex}.btn:disabled{opacity:.4;cursor:not-allowed}.btn-primary{background:var(--copper);color:#fff8f0;border-color:var(--copper)}.btn-primary:hover:not(:disabled){background:var(--copper-deep);border-color:var(--copper-deep)}.btn-ghost{color:var(--text);border-color:var(--line-strong);background:0 0}.btn-ghost:hover:not(:disabled){border-color:var(--copper);color:var(--copper)}.hero{padding-top:84px;padding-bottom:80px}.hero h1{max-width:21ch;margin-top:24px;font-size:clamp(34px,5.2vw,54px);line-height:1.15}.hero h1 em{color:var(--copper);font-style:normal}.hero .sub{max-width:58ch;color:var(--text-soft);margin-top:24px;font-size:19px;line-height:1.6}.hero .cta-row{flex-wrap:wrap;gap:16px;margin-top:36px;display:flex}.stat-strip{border:1px solid var(--line);border-radius:4px;flex-wrap:wrap;margin-top:64px;display:flex;overflow:hidden}.stat{background:var(--surface);border-right:1px solid var(--line);flex:240px;padding:28px 24px}.stat:last-child{border-right:none}@media (max-width:700px){.stat{border-right:none;border-bottom:1px solid var(--line);flex:100%}.stat:last-child{border-bottom:none}}.stat .n{color:var(--text);font-variant-numeric:tabular-nums;letter-spacing:-.01em;font-size:32px;font-weight:600}.stat:first-child .n{font-size:40px}.stat .d{color:var(--text-soft);max-width:26ch;margin-top:8px;font-size:14px;line-height:1.5}.stat .src{color:var(--text-faint);margin-top:12px;font-size:12px}.head{max-width:640px}.head h2{margin-top:16px;font-size:clamp(26px,3.4vw,34px)}.head p.lede{color:var(--text-soft);margin-top:16px;font-size:17px;line-height:1.6}.problem-body{grid-template-columns:1.1fr .9fr;gap:56px;margin-top:44px;display:grid}@media (max-width:820px){.problem-body{grid-template-columns:1fr}}.problem-body p{color:var(--text-soft);font-size:17px;line-height:1.65}.problem-body p+p{margin-top:16px}.callout{background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--copper);box-shadow:var(--shadow);border-radius:2px;padding:24px}.callout .k{font-family:var(--font-body);color:var(--copper);letter-spacing:.02em;font-size:12px;font-weight:600}.callout p{color:var(--text);margin-top:12px;font-size:16px;line-height:1.6}.diagram-wrap{grid-template-columns:1fr 28px;gap:0;margin-top:56px;display:grid}@media (max-width:700px){.diagram-wrap{grid-template-columns:1fr}.loop-col{display:none}}.layers{flex-direction:column;gap:12px;display:flex}.layer{background:var(--surface);border:1px solid var(--line);border-radius:4px;grid-template-columns:64px 1fr;align-items:start;gap:20px;padding:24px;transition:border-color .15s;display:grid}.layer:hover{border-color:var(--line-strong)}.layer .idx{color:var(--text-faint);padding-top:4px;font-size:13px}.layer h3{font-size:18px;font-family:var(--font-body);font-weight:700}.layer .role{letter-spacing:.02em;color:var(--text-faint);margin-top:4px;font-size:12px;font-weight:600;display:block}.layer p{color:var(--text-soft);margin-top:8px;font-size:15px;line-height:1.6}.layer.l0{border-left:3px solid var(--copper);background:var(--copper-soft)}.layer.l0 .role{color:var(--copper)}.loop-col{position:relative}.loop-col svg{width:28px;height:420px;position:sticky;top:120px}.loop-path{fill:none;stroke:var(--line-strong);stroke-width:1.5px;stroke-dasharray:4 5}@media (prefers-reduced-motion:no-preference){.loop-path{animation:14s linear infinite dash}}@keyframes dash{to{stroke-dashoffset:-180px}}.process{grid-template-columns:repeat(4,1fr);gap:0;margin-top:48px;display:grid}@media (max-width:860px){.process{grid-template-columns:1fr 1fr;gap:24px}}@media (max-width:520px){.process{grid-template-columns:1fr}}.step{border-right:1px solid var(--line);padding:0 24px 0 0}.step:last-child{border-right:none}@media (max-width:860px){.step{border-right:none;padding-right:0}}.step .num{color:var(--copper);font-size:13px;font-weight:600}.step h3{font-size:17px;font-family:var(--font-body);margin-top:12px;font-weight:700}.step p{color:var(--text-soft);margin-top:8px;font-size:14px;line-height:1.6}.why-grid{grid-template-columns:1fr 1fr;gap:40px;margin-top:44px;display:grid}@media (max-width:780px){.why-grid{grid-template-columns:1fr}}.why-grid p{color:var(--text-soft);font-size:16px;line-height:1.6}.why-grid p+p{margin-top:16px}blockquote{border-left:2px solid var(--line-strong);font-family:var(--font-display);color:var(--text);margin:0;padding:20px 0 0 20px;font-size:19px;font-style:italic;line-height:1.5}blockquote cite{font-family:var(--font-body);color:var(--text-faint);margin-top:12px;font-size:12px;font-style:normal;display:block}.ask{background:var(--text);color:var(--bg);border-radius:6px;padding:56px 48px}@media (max-width:640px){.ask{padding:40px 24px}}.ask h2{color:var(--bg);margin-top:16px;font-size:clamp(24px,3.2vw,32px)}.ask-list{grid-template-columns:1.3fr 1fr 1fr;gap:24px;margin-top:28px;display:grid}@media (max-width:780px){.ask-list{grid-template-columns:1fr}}.ask-list .item .t{letter-spacing:.02em;color:var(--copper);font-size:12px;font-weight:600}.ask-list .item p{color:color-mix(in srgb, var(--bg) 78%, var(--text));margin-top:8px;font-size:15px;line-height:1.6}.ask .cta-row{margin-top:36px}.ask .btn-ghost{color:var(--bg);border-color:color-mix(in srgb, var(--bg) 35%, transparent)}.ask .btn-ghost:hover{border-color:var(--bg)}footer{padding:48px 0 60px}.foot-grid{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:24px;display:flex}.sources{color:var(--text-faint);max-width:640px;font-size:12px;line-height:1.7}.sources .h{letter-spacing:.02em;color:var(--text-soft);margin-bottom:8px;font-size:12px;font-weight:600}.sources a{color:var(--text-faint)}.copyright{color:var(--text-faint);white-space:nowrap;font-size:12px}