:root{color-scheme:light;--bg: #f6f8f5;--surface: #ffffff;--surface-strong: #f0f5ee;--text: #17211b;--muted: #5b685f;--line: #d7dfd7;--accent: #216d54;--accent-strong: #174d3d;--accent-soft: #dceee5;--gold: #b77a2b;--ink: #13231c;--shadow: 0 18px 48px rgba(22, 39, 30, .12);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html{background:var(--bg)}body{margin:0;color:var(--text);background:linear-gradient(180deg,#dceee5c7,#f6f8f500 430px),var(--bg);font-size:16px;line-height:1.6}main{width:min(1180px,calc(100% - 32px));margin:0 auto}h1,h2,h3,p{margin-top:0}h1{max-width:720px;margin-bottom:12px;color:var(--ink);font-size:48px;line-height:1.05;letter-spacing:0}h2{margin-bottom:14px;color:var(--ink);font-size:30px;line-height:1.15;letter-spacing:0}p{color:var(--muted)}.tool-section{padding:48px 0 34px}.tool-intro{max-width:760px;margin-bottom:24px}.tool-intro p:last-child{max-width:680px;margin-bottom:0;font-size:18px}.eyebrow{margin-bottom:10px;color:var(--accent-strong);font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.calculator-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(340px,.76fr);gap:18px;align-items:stretch}.calculator,.results,.bar-card{border:1px solid var(--line);border-radius:8px;background:#fffffff5;box-shadow:var(--shadow)}.calculator{display:grid;gap:16px;padding:22px}.field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.field{display:grid;gap:8px;min-width:0;color:var(--ink);font-weight:700}.field span,.unit-toggle legend{font-size:14px}.field small{color:var(--muted);font-weight:500}input,select,button{font:inherit}input,select{width:100%;min-height:48px;border:1px solid #c8d3c9;border-radius:6px;background:#fff;color:var(--text);padding:10px 12px}input:focus,select:focus,button:focus-visible,summary:focus-visible{outline:3px solid rgba(33,109,84,.22);outline-offset:2px}.unit-toggle{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin:0;border:0;padding:0}.unit-toggle legend{grid-column:1 / -1;margin-bottom:2px;color:var(--ink);font-weight:800}.unit-toggle label{cursor:pointer}.unit-toggle input{position:absolute;inline-size:1px;block-size:1px;clip:rect(0 0 0 0);clip-path:inset(50%);overflow:hidden;white-space:nowrap}.unit-toggle span{display:grid;min-height:44px;place-items:center;border:1px solid #c8d3c9;border-radius:6px;background:#fff;color:var(--muted);font-weight:800}.unit-toggle input:checked+span{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-strong)}.calculate-button{min-height:50px;border:0;border-radius:6px;background:var(--accent);color:#fff;font-weight:850;cursor:pointer}.calculate-button:hover{background:var(--accent-strong)}.results{display:grid;gap:18px;padding:24px;background:linear-gradient(145deg,#174d3df5,#1c3a30f0),var(--accent-strong);color:#fff}.results .eyebrow,.results p{color:#ffffffc7}.results h2{margin-bottom:0;color:#fff;font-size:40px}.result-list{display:grid;gap:10px;margin:0}.result-list div{display:grid;gap:4px;border-top:1px solid rgba(255,255,255,.16);padding-top:12px}.result-list dt{color:#ffffffb8;font-size:13px;font-weight:700}.result-list dd{margin:0;color:#fff;font-size:20px;font-weight:850}.explanation,.disclaimer{margin-bottom:0}.disclaimer{border-left:3px solid var(--gold);padding-left:12px;font-size:14px}.content-section{padding:46px 0;border-top:1px solid var(--line)}.section-heading{max-width:760px;margin-bottom:20px}.chart-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px;background:var(--surface)}table{width:100%;min-width:720px;border-collapse:collapse}th,td{padding:16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{background:var(--surface-strong);color:var(--ink);font-size:13px;letter-spacing:.02em;text-transform:uppercase}td:first-child,td:nth-child(2){color:var(--ink);font-weight:800}tr:last-child td{border-bottom:0}.split-section,.formula-section{display:grid;grid-template-columns:minmax(0,.92fr) minmax(320px,1fr);gap:34px;align-items:center}.bar-card{display:grid;gap:14px;padding:20px}.bar-row{display:grid;grid-template-columns:64px minmax(120px,1fr) 116px;gap:12px;align-items:center;color:var(--muted);font-size:14px}.bar-row strong{color:var(--ink);text-align:right}.bar-track{height:12px;overflow:hidden;border-radius:999px;background:#e2e8e0}.bar-fill{display:block;width:var(--bar-size);height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--accent),var(--gold))}.formula-section{grid-template-columns:minmax(300px,.72fr) minmax(0,1fr)}.system-visual{border:1px solid var(--line);border-radius:8px;background:var(--surface);padding:18px}.system-visual svg{display:block;width:100%;height:auto}.system-visual rect,.system-visual path,.system-visual line,.system-visual circle{fill:none;stroke:var(--accent-strong);stroke-width:8;stroke-linecap:round;stroke-linejoin:round}.system-visual circle{fill:var(--accent-soft)}.steps{display:grid;gap:10px;margin:0 0 16px;padding-left:22px;color:var(--muted)}.steps li::marker{color:var(--accent);font-weight:900}.faq-list{display:grid;gap:10px}details{border:1px solid var(--line);border-radius:8px;background:var(--surface);padding:0 16px}summary{cursor:pointer;padding:16px 0;color:var(--ink);font-weight:850}details p{margin-bottom:16px}@media(max-width:880px){main{width:min(100% - 24px,720px)}h1{font-size:38px}h2{font-size:26px}.tool-section{padding-top:30px}.calculator-grid,.split-section,.formula-section{grid-template-columns:1fr}.formula-section .system-visual{order:2}}@media(max-width:560px){main{width:min(100% - 20px,520px)}h1{font-size:32px}h2{font-size:24px}.field-grid,.unit-toggle{grid-template-columns:1fr}.calculator,.results{padding:18px}.results h2{font-size:30px}.bar-row{grid-template-columns:54px minmax(90px,1fr)}.bar-row strong{grid-column:2;text-align:left}}