:root{--fg:#1b2428;--muted:#56656b;--bg:#fbfcfc;--card:#fff;--line:#d8e0e2;--accent:#0f5f6e;--accent2:#e7f3f5;--warn:#9a3412;--ok:#166534;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
*{box-sizing:border-box}body{margin:0;color:var(--fg);background:var(--bg);line-height:1.6;font-size:1.0625rem}
.wrap{max-width:46rem;margin:0 auto;padding:0 1rem}
.skip{position:absolute;left:-999px}.skip:focus{left:1rem;top:1rem;background:#fff;padding:.5rem;z-index:9}
.site-header{border-bottom:1px solid var(--line);background:#fff}.site-header .wrap{display:flex;flex-wrap:wrap;gap:.5rem 1rem;align-items:center;justify-content:space-between;padding:.75rem 1rem}
.brand{font-weight:700;color:var(--accent);text-decoration:none;font-size:1.1rem}
nav{display:flex;flex-wrap:wrap;gap:.1rem 0}nav a{white-space:nowrap;margin-right:.9rem;color:var(--fg);font-size:.95rem}nav a[aria-current]{font-weight:700;color:var(--accent)}
h1{font-size:1.7rem;line-height:1.25;margin:1.5rem 0 .5rem}h2{font-size:1.3rem;margin-top:2rem}
.lede{color:var(--muted);margin-top:0}
.calc{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1rem;margin:1.25rem 0}
.grid{display:grid;gap:.9rem;grid-template-columns:1fr}@media(min-width:560px){.grid{grid-template-columns:1fr 1fr}}
label{display:block;font-weight:600;font-size:.95rem;margin-bottom:.25rem}.hint{display:block;font-weight:400;color:var(--muted);font-size:.85rem}
input,select{width:100%;font:inherit;padding:.6rem .7rem;border:1px solid #9aabb0;border-radius:8px;background:#fff;min-height:44px}
input:focus,select:focus,button:focus{outline:3px solid #7cc4d2;outline-offset:1px}
input[aria-invalid=true]{border-color:var(--warn)}
button{margin-top:1rem;font:inherit;font-weight:700;background:var(--accent);color:#fff;border:0;border-radius:8px;padding:.75rem 1.25rem;min-height:44px;cursor:pointer;width:100%}@media(min-width:560px){button{width:auto}}
.errors{color:var(--warn);background:#fff7ed;border:1px solid #fed7aa;border-radius:8px;padding:.5rem 1rem;margin-top:1rem}
.result{background:var(--accent2);border-radius:10px;padding:1rem;margin-top:1rem}.result .big{font-size:1.6rem;font-weight:800;margin:.2rem 0}
.result dl{display:grid;grid-template-columns:auto auto;gap:.2rem 1rem;margin:.5rem 0}.result dt{color:var(--muted)}.result dd{margin:0;font-weight:600;text-align:right}
.v-excellent,.v-good{color:var(--ok)}.v-marginal{color:#a16207}.v-poor{color:var(--warn)}
table{border-collapse:collapse;width:100%;font-size:.95rem;margin:1rem 0}th,td{border-bottom:1px solid var(--line);padding:.4rem;text-align:left}
.note{font-size:.9rem;color:var(--muted);border-left:3px solid var(--line);padding-left:.75rem}
.site-footer{margin-top:3rem;border-top:1px solid var(--line);font-size:.875rem;color:var(--muted);padding:1rem 0}
a{color:var(--accent)}
.unitbar{display:flex;flex-wrap:wrap;gap:.4rem .75rem;align-items:center;margin-bottom:.9rem}.unitbar label{margin:0}.unitbar select{width:auto;min-width:9rem}
.defs dt{font-weight:700;margin-top:.6rem}.defs dd{margin:0 0 .3rem}
.sources{font-size:.9rem;border-top:1px solid var(--line);margin-top:2rem}.sources ol{padding-left:1.2rem}
svg.diagram,figure svg{width:100%;height:auto;display:block}figure{margin:1rem 0}figcaption{font-size:.85rem;color:var(--muted)}
caption{text-align:left;font-weight:600;padding:.3rem 0}
.cards{display:grid;gap:.75rem;grid-template-columns:1fr;padding:0;list-style:none}@media(min-width:560px){.cards{grid-template-columns:1fr 1fr}}.cards li{border:1px solid var(--line);border-radius:10px;padding:.75rem;background:#fff}