:root{
  --paper:#F4F6F5; --card:#FFFFFF; --ink:#16262B; --muted:#53646A;
  --gum:#2E6A5B; --gum-deep:#1F4C41; --wattle:#F3C433; --line:#D6DEDB;
  --ui:"Archivo",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --read:"Literata",Georgia,"Times New Roman",serif;
  --wrap:1120px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17px/1.6 var(--ui)}
img{max-width:100%}
a{color:var(--gum-deep);text-underline-offset:3px}
a:hover{color:var(--gum)}
:focus-visible{outline:3px solid var(--wattle);outline-offset:2px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;background:var(--wattle);padding:8px 12px;z-index:10}

/* header */
.site-head{border-bottom:1px solid var(--line);background:var(--paper)}
.head-in{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;font-size:1.35rem;letter-spacing:-.02em}
.brand svg{width:34px;height:26px}
.brand small{font-weight:600;color:var(--gum);font-size:.9rem}
#site-nav ul{list-style:none;margin:0;padding:0;display:flex;gap:28px}
#site-nav a{text-decoration:none;color:var(--ink);font-weight:600}
#site-nav a[aria-current]{color:var(--gum);box-shadow:inset 0 -2px 0 var(--gum)}
#menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:6px;padding:6px 12px;font:600 15px var(--ui);color:var(--ink)}
@media (max-width:700px){
  #menu-btn{display:block}
  #site-nav{display:none;position:absolute;top:68px;left:0;right:0;background:var(--paper);border-bottom:1px solid var(--line);z-index:5}
  #site-nav.open{display:block}
  #site-nav ul{flex-direction:column;gap:0;padding:8px 20px}
  #site-nav li a{display:block;padding:12px 0}
}

/* type */
h1,h2,h3{font-family:var(--ui);line-height:1.15;letter-spacing:-.02em}
h1{font-size:clamp(2rem,4.5vw,3.1rem);font-weight:800;margin:.4em 0 .3em;max-width:22ch}
h2{font-size:1.55rem;font-weight:700;margin:2em 0 .5em}
h3{font-size:1.15rem;font-weight:700;margin:1.4em 0 .4em}
.lede{font-size:1.15rem;color:var(--muted);max-width:62ch;margin:0 0 1.5em}
.crumbs{font-size:.9rem;color:var(--muted);margin-top:24px}
.crumbs a{color:var(--muted)}

/* calculator */
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0;border:1px solid var(--line);background:var(--card);border-radius:10px;overflow:hidden;margin:8px 0 12px}
.calc form{padding:28px}
.field{margin-bottom:18px}
.field label{display:block;font-weight:600;font-size:.95rem;margin-bottom:6px}
.field input{width:100%;font:500 1.1rem var(--ui);padding:11px 12px;border:1.5px solid #B9C5C1;border-radius:6px;background:#fff;color:var(--ink);font-variant-numeric:tabular-nums}
.field input:focus{border-color:var(--gum);outline:none;box-shadow:0 0 0 3px rgba(46,106,91,.2)}
.field input[aria-invalid]{border-color:#B3261E}
.btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{font:700 1rem var(--ui);padding:12px 20px;border-radius:6px;border:0;cursor:pointer;background:var(--gum-deep);color:#fff;text-decoration:none;display:inline-block}
.btn:hover{background:var(--gum);color:#fff}
.btn.ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line)}
.result{background:var(--wattle);padding:28px;position:relative}
.result h2{margin:0 0 14px;font-size:1rem;font-weight:700;color:var(--ink)}
#results{margin:0}
.res-row{display:flex;justify-content:space-between;gap:16px;padding:10px 0;border-top:1px solid rgba(22,38,43,.22);font-variant-numeric:tabular-nums}
.res-row dt{font-size:.95rem}
.res-row dd{margin:0;font-weight:700;text-align:right}
.res-main{flex-direction:column;border-top:0;padding-top:0;gap:2px}
.res-main dd{font-size:clamp(1.8rem,3.2vw,2.8rem);font-weight:800;letter-spacing:-.03em;text-align:left;line-height:1.1}
.res-note{margin:0}
.result .fine{font-size:.8rem;margin:16px 0 0;color:#3b4a3e}
@media (max-width:760px){.calc{grid-template-columns:1fr}}

/* content blocks */
.cols{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:56px}
@media (max-width:900px){.cols{grid-template-columns:1fr;gap:0}}
.prose{max-width:68ch}
.prose p,.prose li{font-family:var(--read);font-size:1.06rem;line-height:1.75}
.formula{border-left:4px solid var(--gum);padding:4px 0 4px 18px;margin:0}
.aside h2{font-size:1.1rem;margin-top:2em}
.aside ul{list-style:none;padding:0;margin:0}
.aside li{border-top:1px solid var(--line);padding:10px 0}
.aside li a{font-weight:600;text-decoration:none}
.faq dt{font-weight:700;margin-top:1.1em}
.faq dd{margin:.3em 0 0;font-family:var(--read);line-height:1.7}
.note{font-size:.88rem;color:var(--muted);border-top:1px solid var(--line);padding-top:14px;margin-top:40px}
table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums;margin:1em 0}
th,td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);font-size:.98rem}
th{font-weight:700;background:#E9EEEC}
td:last-child{text-align:right;font-weight:600}
.cta{background:var(--gum-deep);color:#fff;border-radius:10px;padding:26px 28px;margin:40px 0}
.cta p{margin:0 0 14px;font-family:var(--ui);font-size:1.15rem;font-weight:600}
.cta .btn{background:var(--wattle);color:var(--ink)}
.cta .btn:hover{background:#FFD65A;color:var(--ink)}
.meta{color:var(--muted);font-size:.92rem;margin:-6px 0 20px}

/* listings */
.hero{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:48px;align-items:center;padding:48px 0 32px}
.hero h1{font-size:clamp(2.3rem,5.4vw,3.9rem);max-width:13ch}
@media (max-width:860px){.hero{grid-template-columns:1fr;gap:12px;padding-top:28px}}
.search{width:100%;max-width:520px;font:500 1.05rem var(--ui);padding:13px 14px;border:1.5px solid #B9C5C1;border-radius:6px;margin:8px 0 8px}
.cat-block{border-top:2px solid var(--ink);padding-top:6px;margin-top:40px}
.cat-block h2{margin:.4em 0 .6em;display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.cat-block h2 a{text-decoration:none;color:var(--ink)}
.cat-block h2 span{font-size:.9rem;font-weight:600;color:var(--muted)}
.clist{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));column-gap:32px}
.clist li{border-bottom:1px solid var(--line);padding:11px 0}
.clist a{font-weight:600;text-decoration:none;color:var(--ink)}
.clist a:hover{color:var(--gum)}
.clist p{margin:3px 0 0;font-size:.88rem;color:var(--muted);line-height:1.45}
.plist{list-style:none;padding:0;margin:0}
.plist li{border-bottom:1px solid var(--line);padding:14px 0}
.plist a{font-weight:700;text-decoration:none;font-size:1.05rem}
.plist p{margin:4px 0 0;color:var(--muted);font-size:.92rem}

/* footer */
.site-foot{margin-top:80px;background:var(--ink);color:#C9D3D0;padding:44px 0 28px;font-size:.93rem}
.site-foot a{color:#fff;text-decoration:none}
.site-foot a:hover{text-decoration:underline}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px}
.site-foot ul{list-style:none;padding:0;margin:0}
.site-foot li{margin:6px 0}
.site-foot h2{color:#fff;font-size:1rem;margin:0 0 10px}
.legal{border-top:1px solid #33464C;margin-top:28px;padding-top:16px;font-size:.84rem}
@media (max-width:700px){.foot-grid{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.hero .calc{grid-template-columns:minmax(0,4fr) minmax(0,6fr)}.hero .res-main dd{font-size:clamp(1.8rem,2.6vw,2.4rem);white-space:nowrap}@media (max-width:760px){.hero .calc{grid-template-columns:1fr}}
tr.base td{background:#FCF1C9;font-weight:700}