:root{color-scheme:light;--page:#fbfaf7;--surface:#fff;--surface-2:#f2f0ea;--ink:#16181a;--ink-2:#474b4f;--muted:#6c7177;--line:#e2dfd6;--accent:#1f6f5c;--accent-ink:#fff;--accent-soft:#e3f1ec;--focus:#2a78d6;--danger:#b3261e;--radius:12px;--shadow:0 1px 2px #0000000a, 0 4px 16px #0000000d;--font:system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, "Cascadia Mono", "SF Mono", Consolas, monospace}@media (prefers-color-scheme:dark){:root{color-scheme:dark;--page:#111312;--surface:#1a1d1c;--surface-2:#232726;--ink:#eef0ee;--ink-2:#c4c9c6;--muted:#8f9692;--line:#2e3331;--accent:#4cb59a;--accent-ink:#0c1a16;--accent-soft:#19302a;--focus:#6aa8f0;--danger:#f08a80;--shadow:none}}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--page);color:var(--ink);font:16px/1.6 var(--font);margin:0}a{color:var(--accent);text-underline-offset:2px}a:hover{text-decoration-thickness:2px}:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:4px}h1,h2,h3{color:var(--ink);line-height:1.25}h1{letter-spacing:-.01em;margin:.4em 0 .3em;font-size:clamp(1.8rem,1.4rem + 1.6vw,2.5rem)}h2{margin:1.8em 0 .5em;font-size:1.35rem}h3{margin:1.2em 0 .4em;font-size:1.05rem}code{font-family:var(--mono);font-size:.92em}[hidden]{display:none!important}.muted{color:var(--muted)}.wrap{width:min(1120px,100% - 32px);margin-inline:auto}.skip{position:absolute;left:-999px}.skip:focus{background:var(--surface);z-index:10;padding:8px 12px;top:8px;left:16px}.site-header{background:var(--surface);border-bottom:1px solid var(--line)}.header-inner{flex-wrap:wrap;align-items:center;gap:24px;min-height:60px;display:flex}.logo{color:var(--ink);align-items:center;gap:8px;font-size:1.1rem;font-weight:750;text-decoration:none;display:inline-flex}.logo.small{font-size:1rem}.logo-mark{background:var(--accent);width:28px;height:28px;color:var(--accent-ink);border-radius:8px;place-items:center;font-weight:800;display:inline-grid}.header-inner{justify-content:space-between}.nav-bar{border-top:1px solid var(--line)}.nav{scrollbar-width:none;gap:2px;margin-block:0;padding:6px 0;list-style:none;display:flex;overflow-x:auto}.nav::-webkit-scrollbar{display:none}.nav a{white-space:nowrap;color:var(--ink-2);border-radius:8px;align-items:center;gap:6px;padding:6px 10px;font-size:.93rem;text-decoration:none;display:inline-flex}.nav a .icon{color:var(--muted)}.nav a:hover,.nav a[aria-current=page],.nav a.active{background:var(--surface-2);color:var(--ink)}.nav a[aria-current=page] .icon,.nav a.active 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a{color:var(--ink);border-radius:8px;justify-content:space-between;gap:12px;padding:8px 10px;text-decoration:none;display:flex}.search-results a span{color:var(--muted);white-space:nowrap;font-size:.85rem}.search-results [aria-selected=true] a,.search-results a:hover{background:var(--accent-soft)}.search-empty{color:var(--muted);padding:8px 10px;font-size:.92rem}.site-footer{border-top:1px solid var(--line);background:var(--surface);margin-top:64px;padding:32px 0 24px;font-size:.92rem}.footer-inner{grid-template-columns:2fr 1fr 1fr;gap:24px;display:grid}.footer-links{gap:6px;margin:0;padding:0;list-style:none;display:grid}.footer-links a{color:var(--ink-2);text-decoration:none}.footer-links a:hover{color:var(--accent)}.copyright{margin-top:24px;font-size:.85rem}.crumbs{color:var(--muted);margin-top:20px;font-size:.88rem}.crumbs a{color:var(--muted)}.lede{color:var(--ink-2);max-width:68ch;margin:0 0 20px;font-size:1.1rem}.hero{padding:40px 0 8px}.hero h1{letter-spacing:-.02em;max-width:18ch;font-size:clamp(2rem,1.5rem + 2.4vw,3.1rem)}.trust{color:var(--ink-2);flex-wrap:wrap;gap:8px 22px;margin:0;padding:0;font-size:.92rem;list-style:none;display:flex}.trust li:before{content:"✓";color:var(--accent);margin-right:6px;font-weight:800}.home-section{margin-top:44px}.home-section>h2{margin:0 0 14px}.card-icon{align-items:flex-start;gap:12px;display:flex}.card-icon>.icon{color:var(--accent);background:var(--accent-soft);border-radius:8px;flex:none;width:34px;height:34px;padding:6px}.directory{columns:3 260px;column-gap:32px}.dir-cat{break-inside:avoid;margin-bottom:26px}.dir-cat h3{align-items:baseline;gap:8px;margin:0 0 8px;font-size:1.05rem;display:flex}.dir-cat h3 a{color:var(--ink);align-items:center;gap:8px;text-decoration:none;display:inline-flex}.dir-cat h3 a .icon{color:var(--accent);align-self:center}.dir-cat h3 a:hover{color:var(--accent)}.dir-cat h3 .muted{font-size:.85rem;font-weight:500}.dir-cat ul{gap:4px;margin:0;padding:0 0 0 28px;list-style:none;display:grid}.dir-cat li a{color:var(--ink-2);text-decoration:none}.dir-cat li a:hover{color:var(--accent);text-decoration:underline}.hub-head{align-items:flex-start;gap:16px;display:flex}.hub-head h1{margin-top:.2em}.hub-icon{background:var(--accent-soft);width:56px;height:56px;color:var(--accent);border-radius:14px;flex:none;place-items:center;margin-top:16px;display:grid}.hub-count{margin:-6px 0 16px;font-size:.92rem}.card-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;margin:0;padding:0;list-style:none;display:grid}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);height:100%;color:var(--ink);box-shadow:var(--shadow);padding:14px 16px;text-decoration:none;transition:border-color .15s;display:block}.card:hover{border-color:var(--accent)}.card strong{color:var(--accent);display:block}.card span{color:var(--ink-2);margin-top:2px;font-size:.92rem;display:block}.calc{grid-template-columns:minmax(0,5fr) minmax(0,6fr);align-items:start;gap:20px;margin:8px 0 24px;display:grid}.calc-form,.calc-results{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}.calc-results{min-height:200px;position:sticky;top:16px}.field{margin-bottom:14px}.field label{margin-bottom:4px;font-size:.95rem;font-weight:600;display:block}.input-wrap{border:1px solid var(--line);background:var(--page);border-radius:8px;align-items:stretch;display:flex;overflow:hidden}.input-wrap:focus-within{border-color:var(--focus);box-shadow:0 0 0 3px color-mix(in srgb, var(--focus) 25%, transparent)}.input-wrap input{min-width:0;color:var(--ink);font:inherit;font-variant-numeric:tabular-nums;background:0 0;border:0;flex:1;padding:9px 10px;font-size:1.05rem}.input-wrap input:focus{outline:none}.affix{color:var(--muted);background:var(--surface-2);place-items:center;padding:0 10px;font-size:.95rem;display:grid}.calc-form select{width:100%;font:inherit;color:var(--ink);background:var(--page);border:1px solid var(--line);border-radius:8px;padding:9px 10px}.calc-form textarea{width:100%;font:inherit;font-variant-numeric:tabular-nums;color:var(--ink);background:var(--page);border:1px solid var(--line);resize:vertical;border-radius:8px;padding:9px 10px}.calc-form textarea:focus{border-color:var(--focus);box-shadow:0 0 0 3px color-mix(in srgb, var(--focus) 25%, transparent);outline:none}.input-wrap input[type=date],.input-wrap input[type=time]{color-scheme:light dark}.help{color:var(--muted);margin:4px 0 0;font-size:.85rem}.form-actions{gap:8px;margin-top:18px;display:flex}.btn{font:inherit;border:1px solid var(--accent);background:var(--accent);color:var(--accent-ink);cursor:pointer;border-radius:8px;padding:9px 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h3{margin-top:18px}.table-scroll{overflow-x:auto}.result-table table{border-collapse:collapse;font-variant-numeric:tabular-nums;width:100%;font-size:.9rem}.result-table th{text-align:left;color:var(--muted);border-bottom:1px solid var(--line);white-space:nowrap;padding:6px 8px;font-weight:600}.result-table td{border-bottom:1px solid var(--line);white-space:nowrap;padding:6px 8px}.result-table .num{text-align:right}.show-more{font:inherit;border:1px solid var(--line);color:var(--accent);cursor:pointer;background:0 0;border-radius:8px;margin-top:10px;padding:6px 12px;font-size:.9rem}.content-grid{grid-template-columns:minmax(0,1fr) 300px;align-items:start;gap:40px;display:grid}.content{max-width:72ch}.content p,.content li{color:var(--ink-2)}.formula{background:var(--surface-2);border-radius:10px;gap:6px;padding:14px 16px;display:grid}.formula code{color:var(--ink);white-space:pre-wrap;font-size:1rem}.where{font-size:.95rem}.steps li{margin-bottom:4px}.faq{border-bottom:1px solid var(--line);padding:10px 0}.faq summary{cursor:pointer;color:var(--ink);font-weight:650}.faq p{margin:8px 0 4px}.sources ul{padding-left:18px}.reviewed{margin-top:28px;font-size:.88rem}.related{margin-top:2.2em;position:sticky;top:16px}.related h2{margin-top:0;font-size:1.05rem}.related ul{gap:8px;margin:0;padding:0;list-style:none;display:grid}.related a{border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:10px 12px;text-decoration:none;display:block}.related a:hover{border-color:var(--accent)}.related strong{display:block}.related span{color:var(--ink-2);font-size:.88rem;display:block}.prose{margin-top:24px}@media (width<=860px){.calc{grid-template-columns:1fr}.calc-results{position:static}.content-grid{grid-template-columns:1fr;gap:16px}.related{margin-top:0;position:static}.footer-inner{grid-template-columns:1fr}.header-inner{gap:10px;padding:8px 0}.search{flex-basis:100%}.hub-icon{display:none}}