:root{--ink:#243c35;--muted:#57675d;--paper:#f7f6ef;--line:#d8ddd1;--accent:#b65b35;--tint:#e7eddf;--white:#fffefa}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:2rem}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.65 Arial,Helvetica,sans-serif}.fire{--ink:#302f27;--muted:#68645a;--paper:#faf7f0;--line:#e1dbcf;--accent:#9f472e;--tint:#eee4d7}a{color:inherit;text-underline-offset:.22em}a:hover{color:var(--accent)}a:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:5px}img{max-width:100%;height:auto;display:block}h1,h2,h3{font-weight:500;line-height:1.1;letter-spacing:-.035em}h1,h2{font-family:Georgia,'Times New Roman',serif}h1{font-size:clamp(2.75rem,4.75vw,4.6rem);margin:1.2rem 0 1.5rem}h2{font-size:clamp(2rem,3.2vw,3.05rem);margin:.6rem 0 1.1rem}h3{font-size:1.4rem;margin:.3rem 0 1rem;font-weight:600;letter-spacing:-.015em}p{margin:.7rem 0 1.1rem}.wrap{width:min(1280px,calc(100% - 64px));margin:auto}.skip{position:absolute;top:-80px;left:1rem;background:white;padding:1rem;z-index:10}.skip:focus{top:1rem}.site-header{padding:24px 0;border-bottom:1px solid var(--line)}.head{display:flex;align-items:center;justify-content:space-between;gap:28px}.identity{text-decoration:none;display:flex;align-items:center;gap:16px}.wordmark{font-size:1.75rem;letter-spacing:.15em;font-weight:800}.site-label{font-size:.8rem;line-height:1.2;text-transform:uppercase;letter-spacing:.1em;border-left:1px solid var(--line);padding-left:16px;max-width:140px}nav{display:flex;gap:24px;align-items:center;font-size:.9rem}nav a{text-decoration:none}.nav-cta{border:1px solid var(--ink);padding:10px 16px;border-radius:4px}.eyebrow{text-transform:uppercase;letter-spacing:.15em;font-size:.72rem;font-weight:700;color:var(--accent)}.hero{display:grid;grid-template-columns:.95fr 1.05fr;gap:64px;align-items:center;padding:64px 0 46px}.hero p.intro{font-size:1.14rem;max-width:510px;color:var(--muted)}.hero figure{margin:0;min-width:0}.hero img{width:100%;height:540px;object-fit:cover;border-radius:6px}.hero figcaption,.caption{font-size:.73rem;color:var(--muted);margin:9px 0 0}.actions{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0 20px}.btn{display:inline-block;background:var(--ink);color:white;padding:13px 19px;text-decoration:none;border:1px solid var(--ink);border-radius:4px;font-size:.92rem;font-weight:600}.btn:hover{background:var(--accent);color:white;border-color:var(--accent)}.btn.secondary{background:transparent;color:var(--ink);border-color:var(--line)}.micro{font-size:.82rem;color:var(--muted)}.notice{padding:20px 26px;background:var(--tint);border-left:3px solid var(--accent);font-size:.93rem}.notice p{margin:0}.strip{display:grid;grid-template-columns:repeat(3,1fr);padding:24px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);gap:24px}.strip strong{font-weight:600;display:block}.strip span{font-size:.86rem;color:var(--muted)}.section{padding:66px 0;border-bottom:1px solid var(--line)}.section-head{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:end;margin-bottom:32px}.section-head p{color:var(--muted);margin-bottom:4px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.grid.two{grid-template-columns:repeat(2,1fr)}.card{padding:28px;background:var(--white);border:1px solid var(--line);border-radius:5px}.card .number{font-family:Georgia,serif;color:var(--accent);font-size:2rem;display:block;margin-bottom:24px}.card p{font-size:.96rem;color:var(--muted)}.card .text-link{display:inline-block;font-size:.9rem;margin-top:4px;font-weight:600}.dark{background:var(--ink);color:var(--paper);border-radius:7px;padding:44px}.dark p{color:#e1e4d9}.dark .eyebrow{color:#e4b18e}.dark .btn{background:var(--paper);color:var(--ink);border-color:var(--paper)}.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:5px;overflow:hidden}.flow>div{padding:28px;border-right:1px solid var(--line)}.flow>div:last-child{border:0}.flow p{font-size:.93rem;color:var(--muted)}.flow .eyebrow{display:block;margin-bottom:20px}.split{display:grid;grid-template-columns:1fr 1fr;gap:60px}.list{padding-left:1.25rem}.list li{margin:.8rem 0}.library{display:grid;grid-template-columns:1fr 1fr;gap:0 32px}.library a{padding:19px 0;border-top:1px solid var(--line);text-decoration:none;display:flex;justify-content:space-between;gap:15px}.library a:after{content:'↗';color:var(--accent)}.faq{max-width:940px}details{border-top:1px solid var(--line);padding:20px 0}details:last-child{border-bottom:1px solid var(--line)}summary{font-size:1.15rem;font-weight:600;cursor:pointer}details p{color:var(--muted);max-width:800px;margin-bottom:0}.sources{font-size:.86rem;color:var(--muted)}.sources a{display:inline-block;margin:0 18px 10px 0}.cta{display:grid;grid-template-columns:1.5fr 1fr;gap:40px;align-items:center}.footer{padding:34px 0 45px}.footer-top{display:flex;justify-content:space-between;gap:30px;align-items:center}.footer-links{display:flex;gap:22px;font-size:.88rem;flex-wrap:wrap}.footer p{font-size:.79rem;max-width:960px;color:var(--muted)}.article-head{padding:45px 0 25px;max-width:940px}.article-head h1{font-size:clamp(2.6rem,4.3vw,4.1rem)}.article-head .intro{font-size:1.2rem;color:var(--muted)}.breadcrumb{font-size:.83rem;color:var(--muted)}.article-layout{display:grid;grid-template-columns:minmax(0,860px) 260px;gap:64px;align-items:start;padding-bottom:50px}.article h2{font-size:2.2rem;margin-top:2rem}.article h3{margin-top:1.8rem}.article-aside{padding:25px;border:1px solid var(--line);border-radius:5px;background:var(--white);margin-top:25px}.article-aside a{display:block;font-size:.9rem;margin:18px 0}.table-wrap{overflow-x:auto;margin:24px 0}table{width:100%;border-collapse:collapse;font-size:.92rem;background:var(--white)}th,td{padding:16px;text-align:left;border:1px solid var(--line);vertical-align:top}th{background:var(--tint)}.equation{background:var(--tint);padding:22px;font:1.05rem/1.8 ui-monospace,monospace;overflow-wrap:anywhere}.article .notice{margin:25px 0}sup{font-size:.7em}sup a{color:var(--accent)}@media(max-width:1000px){.hero{gap:32px}.hero img{height:480px}nav{gap:16px}.site-label{display:none}.grid{gap:14px}.card{padding:22px}.flow{grid-template-columns:1fr 1fr}.flow>div:nth-child(2){border-right:0}.flow>div:nth-child(-n+2){border-bottom:1px solid var(--line)}.article-layout{grid-template-columns:1fr;gap:0}.article-aside{max-width:860px}.section-head{gap:30px}}@media(max-width:720px){.wrap{width:calc(100% - 36px)}.site-header{padding:18px 0}.head{display:block}.identity{margin-bottom:16px}nav{justify-content:space-between;gap:8px;font-size:.83rem}.nav-cta{padding:7px 10px}.wordmark{font-size:1.5rem}.site-label{display:block;max-width:none}.hero{grid-template-columns:1fr;gap:24px;padding:36px 0}.hero h1{font-size:2.85rem;margin-top:.8rem}.hero img{height:auto;aspect-ratio:1.35;object-fit:cover}.hero .intro{font-size:1.05rem}.strip{gap:12px}.strip strong{font-size:.92rem}.strip span{font-size:.75rem}.section{padding:42px 0}.section-head,.split,.cta{grid-template-columns:1fr;gap:12px}.grid,.grid.two{grid-template-columns:1fr}.card{padding:24px}.card .number{margin-bottom:14px}.flow{grid-template-columns:1fr}.flow>div{border-right:0;border-bottom:1px solid var(--line)}.library{grid-template-columns:1fr}.dark{padding:28px}.footer-top{align-items:flex-start;flex-direction:column;gap:18px}.footer-links{gap:14px}.article-head{padding-top:28px}.article-head h1{font-size:2.7rem}.article h2{font-size:1.85rem}th,td{padding:12px;min-width:135px}.notice{padding:18px}.actions{gap:10px}.btn{padding:12px 15px;font-size:.9rem}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}