:root{--ink:#1d2433;--muted:#5b6475;--line:#e3e6ec;--bg:#fff;--accent:#2f6d3a;--soft:#f4f7f2}*{box-sizing:border-box}body{margin:0;font:17px/1.65 system-ui,-apple-system,segoe ui,Roboto,sans-serif;color:var(--ink);background:var(--bg)}.wrap{max-width:820px;margin:0 auto;padding:0 16px}a{color:var(--accent)}.site-header{border-bottom:1px solid var(--line)}.site-header .wrap{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;padding:14px 16px}.logo{font-weight:800;text-decoration:none;color:var(--ink);font-size:20px}.logo span{color:var(--accent)}nav{display:flex;flex-wrap:wrap;gap:4px 14px}nav a{text-decoration:none;font-size:15px;color:var(--ink)}.crumbs{font-size:14px;color:var(--muted);margin:18px 0 0}.crumbs a{color:var(--muted)}h1{font-size:34px;line-height:1.2;margin:18px 0 8px}h2{font-size:24px;margin-top:36px}h3{font-size:19px}.meta{color:var(--muted);font-size:14px;margin-top:0}.hero{padding:28px 0 8px}.hero p{font-size:19px;color:var(--muted)}table{display:block;overflow-x:auto;max-width:100%;border-collapse:collapse;margin:18px 0;font-size:15px}th,td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}th{background:var(--soft)}.table-wrap{overflow-x:auto}.cards{list-style:none;padding:0;display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.cards a{display:block;border:1px solid var(--line);border-radius:10px;padding:14px;text-decoration:none;color:var(--ink);height:100%}.cards a:hover{border-color:var(--accent)}.cards span{display:block;color:var(--muted);font-size:14px;margin-top:4px}.note{background:var(--soft);border-left:4px solid var(--accent);padding:12px 14px;border-radius:4px}.calc{border:1px solid var(--line);border-radius:10px;padding:18px;background:var(--soft)}.calc label{display:block;font-weight:600;margin:8px 0 4px}.calc input,.calc select{font-size:17px;padding:8px;width:100%;max-width:260px}.calc button{margin-top:12px;font-size:16px;padding:10px 18px;background:var(--accent);color:#fff;border:0;border-radius:6px;cursor:pointer}.calc output{display:block;margin-top:14px;font-size:20px;font-weight:700}.related{margin-top:40px;border-top:1px solid var(--line)}.site-footer{border-top:1px solid var(--line);margin-top:48px;color:var(--muted);font-size:14px}.toc{border:1px solid var(--line);border-radius:8px;padding:10px 14px;margin:18px 0;font-size:15px}.toc summary{font-weight:700;cursor:pointer}.toc ul{margin:6px 0;padding-left:18px}.faq details{border-bottom:1px solid var(--line);padding:10px 0}.faq summary{font-weight:600;cursor:pointer}.faq details div{margin-top:6px}.sources{font-size:14px;color:var(--muted)}.sources a{word-break:break-word}.timeline{list-style:none;padding:0;border-left:3px solid var(--accent);margin-left:6px}.timeline li{padding:0 0 14px 16px;position:relative}.timeline li strong{display:inline-block;min-width:56px}.calc .row{display:flex;flex-wrap:wrap;gap:12px}.calc .row>div{flex:1 1 180px}.site-footer .cols{display:flex;flex-wrap:wrap;gap:24px;padding:18px 0}.site-footer .cols div{flex:1 1 180px}.site-footer h3{font-size:14px;color:var(--ink);margin:0 0 6px}.site-footer ul{list-style:none;padding:0;margin:0}.fig{margin:18px 0}.fig img{width:100%;height:auto;border-radius:10px;display:block}.fig figcaption{font-size:13px;color:var(--muted);margin-top:6px}.hero-img.portrait img,.fig.portrait img{aspect-ratio:16/9;height:auto;max-height:440px;object-fit:cover;object-position:center 35%}.fig.right{float:right;width:40%;margin:4px 0 12px 18px}@media(max-width:600px){.fig.right{float:none;width:100%;margin:18px 0}}.faq,.sources,.related{clear:both}