@charset "UTF-8";
:root{--bg:#f4f1e9;--ink:#172e29;--muted:#53655e;--line:#cdd5cd;--accent:#d6f46b;--paper:#fffdf7;--dark:#183b31;--radius:18px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.7 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:inherit;text-underline-offset:4px}a:hover{color:#386d35}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #507b19;outline-offset:5px}h1,h2,h3,p{margin-top:0}h1,h2{font-family:Georgia,"Times New Roman",serif;line-height:1.1;font-weight:500;letter-spacing:-.04em}h1{font-size:clamp(2.5rem,6.5vw,5.5rem);max-width:900px;margin-bottom:24px}h2{font-size:clamp(1.9rem,3.5vw,3rem);margin-bottom:24px}h3{font-size:1.15rem;line-height:1.4}p{max-width:76ch}.wrap{width:min(1160px,calc(100% - 48px));margin:auto}.skip{position:absolute;top:-80px;background:white;padding:10px;z-index:5}.skip:focus{top:0}header{border-bottom:1px solid var(--line)}.head{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 0}.brand{display:inline-flex;align-items:center;gap:12px;font-size:21px;font-weight:750;text-decoration:none;white-space:nowrap}.mark{display:grid;place-items:center;background:var(--dark);color:var(--accent);width:42px;height:42px;border-radius:50%;font:24px Georgia,serif}nav{display:flex;flex-wrap:wrap;gap:14px 25px;font-size:14px;font-weight:650}nav a{text-decoration:none}nav a[aria-current=page]{text-decoration:underline}main{min-height:65vh}.hero{padding:78px 0 55px}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.16em;font-weight:750;margin-bottom:22px}.lede{font-size:21px;line-height:1.6;color:var(--muted);max-width:760px}.meta{font-size:13px;color:var(--muted)}.hero-grid{display:grid;grid-template-columns:1.6fr 1fr;align-items:center;gap:50px}.hero-grid h1{font-size:clamp(2.8rem,5.6vw,4.9rem)}.diagram{background:var(--dark);color:white;padding:34px;border-radius:var(--radius);transform:rotate(2deg);box-shadow:12px 14px 0 #dce3cf}.diagram .eyebrow{color:#bfd3c1}.big{font:80px/1 Georgia,serif;color:var(--accent);margin:24px 0}.bar{height:14px;border-radius:9px;background:#61766b;overflow:hidden;margin:26px 0}.bar span{display:block;width:96%;height:100%;background:var(--accent)}.diagram small{display:block;color:#d2e0d5;line-height:1.6}.actions{display:flex;gap:15px;flex-wrap:wrap;margin:30px 0}.button{display:inline-block;background:var(--dark);color:white;text-decoration:none;padding:13px 22px;border:0;border-radius:7px;font:600 15px/1.5 system-ui;cursor:pointer}.button:hover{background:#2a5644;color:white}.button.secondary{background:transparent;color:var(--ink);border:1px solid var(--ink)}.section{padding:54px 0;border-top:1px solid var(--line)}.section-title{display:flex;justify-content:space-between;align-items:baseline;gap:20px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.card{padding:30px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius)}.card .number{display:block;font:36px Georgia,serif;color:#6b816b;margin-bottom:25px}.card p{font-size:15px;color:var(--muted)}.card a{font-size:15px;font-weight:700}.note{padding:24px 28px;border-left:4px solid #6a8648;background:#e7ecdc;margin:28px 0}.note p:last-child{margin-bottom:0}.article{max-width:820px}.article section{margin-bottom:46px}.article h2{font-size:2.1rem}.article li{margin-bottom:12px}.article ul,.article ol{padding-left:24px}.table-scroll{overflow-x:auto;margin:28px 0}table{width:100%;border-collapse:collapse;background:var(--paper);font-size:15px}th,td{padding:16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}th{background:#e4e9da}.calc{display:grid;grid-template-columns:1.1fr 1fr;gap:30px;padding:30px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);margin:24px 0}label{display:block;font-size:14px;font-weight:650;margin-bottom:15px}input,select{display:block;width:100%;font:17px system-ui;padding:12px;margin-top:6px;border:1px solid #7a8c81;border-radius:6px;background:#fff;color:var(--ink)}.result{background:var(--dark);padding:25px;color:#fff;border-radius:10px;align-self:start}.result strong{display:block;color:var(--accent);font:42px Georgia,serif;margin:10px 0}.result p{font-size:14px}.error{color:#a02214;font-size:14px;min-height:24px}.sources{font-size:14px;padding-top:25px;border-top:1px solid var(--line)}.sources li{margin:8px 0}footer{background:var(--dark);color:#d1ded5;margin-top:65px;padding:42px 0;font-size:13px}footer a{color:inherit}footer .foot{display:flex;justify-content:space-between;gap:30px}footer p{max-width:620px}footer nav{font-size:13px}.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:30px}code{font-size:.9em;overflow-wrap:anywhere}.formula{padding:20px;background:#e7ecdc;border-radius:8px;font-family:monospace;font-size:15px}.checklist{list-style:none;padding:0!important}.checklist li{padding:16px 0;border-bottom:1px solid var(--line)}.checklist strong{display:block}details{border-top:1px solid var(--line);padding:18px 0}summary{cursor:pointer;font-weight:650}details p{padding-top:16px}.callout{background:var(--accent);padding:35px;border-radius:var(--radius)}@media(max-width:760px){.wrap{width:calc(100% - 32px)}.head{align-items:flex-start;flex-direction:column;gap:16px}.hero{padding:45px 0 35px}.hero-grid,.calc{grid-template-columns:1fr;gap:25px}.cards{grid-template-columns:1fr}.diagram{transform:none;max-width:500px}.big{font-size:64px}.section{padding:36px 0}.section-title,footer .foot{display:block}.lede{font-size:18px}.card{padding:23px}.calc{padding:20px}.hero-grid h1{font-size:3rem}nav{gap:12px 20px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}