:root{--brand:#0f5e63;--brand-d:#0a4448;--accent:#e8f3f3;--ink:#1b1f23;--muted:#4a5560;--line:#c9d6d7;--bg:#fff;--err:#a3201a;--err-bg:#fdecea;--ok:#17603a;--focus:#1d4ed8;--sans:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.55 var(--sans)}
a{color:var(--brand)}a:hover{color:var(--brand-d)}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
[hidden]{display:none!important}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px;top:0;background:#fff;color:var(--ink);padding:10px 14px;z-index:9}.skip:focus{left:8px;top:8px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* header */
.site-head{background:var(--brand);color:#fff}
.site-head .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:0 18px;padding-top:4px;padding-bottom:2px}
.brand{display:inline-flex;align-items:center;gap:10px;min-height:44px;color:#fff;text-decoration:none;font-weight:700;font-size:1.05rem;line-height:1.2}
.brand:hover{color:#fff}.brand svg{width:30px;height:30px;flex:none}
.nav{display:flex;gap:2px;overflow-x:auto;flex:1 1 100%;scrollbar-width:thin}
.nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 12px;color:#fff;text-decoration:none;white-space:nowrap;font-size:.95rem;border-bottom:3px solid transparent}
.nav a:hover{border-bottom-color:#9fd4d7;color:#fff}
.nav a[aria-current=page]{border-bottom-color:#fff;font-weight:700}
@media (min-width:900px){.nav{flex:1 1 auto;justify-content:flex-end}.site-head .wrap{padding-top:0;padding-bottom:0}}

main{padding-bottom:36px}
h1,h2,h3{line-height:1.25;color:#10262a}
h1{font-size:1.65rem;margin:14px 0 6px}
h2{font-size:1.4rem;margin:34px 0 10px}
h3{font-size:1.1rem;margin:20px 0 6px}
@media (min-width:700px){h1{font-size:2.1rem;margin:20px 0 8px}}
.intro{font-size:1.04rem;margin:0 0 14px;max-width:70ch}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:0 6px;padding:0;margin:6px 0 0;font-size:.9rem;color:var(--muted)}
.crumbs li{display:inline-flex;align-items:center;min-height:32px}
.crumbs li+li::before{content:"\203A";margin-right:6px}
.crumbs a{display:inline-flex;align-items:center;min-height:44px}
.last-reviewed,.last-updated{font-size:.9rem;color:var(--muted);margin:10px 0 0}

/* tool card */
.tool{background:var(--accent);border:1px solid var(--line);border-radius:14px;padding:14px;margin:0 0 8px}
.tool+.tool{margin-top:18px}
.tool h2{margin-top:0;font-size:1.2rem}
.tool-grid{display:grid;gap:14px}
@media (min-width:900px){.tool-grid.two{grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);align-items:start}.tool{padding:18px}}
.panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px}
.tabs{display:flex;flex-wrap:wrap;gap:6px;border:0;padding:0;margin:0 0 12px;min-width:0}
.tabs legend{padding:0}
.tab{position:relative;display:block}
.tab input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer}
.tab span{display:flex;align-items:center;justify-content:center;min-height:44px;padding:6px 14px;border:2px solid var(--line);border-radius:10px;background:#fff;font-weight:600;text-align:center}
.tab input:checked+span{background:var(--brand);border-color:var(--brand);color:#fff}
.tab input:focus-visible+span{outline:3px solid var(--focus);outline-offset:2px}
.seg{margin-bottom:10px}.seg .tab span{min-height:44px;padding:4px 12px;font-size:.95rem}

.field{margin:0 0 10px}
.field>label,.cell>label,.lbl{display:block;font-weight:600;font-size:.95rem;margin:0 0 3px}
.u{font-weight:400;color:var(--muted)}
input[type=text],select,textarea{width:100%;min-height:44px;font:inherit;font-size:1.05rem;padding:8px 10px;border:2px solid #8aa0a2;border-radius:8px;background:#fff;color:var(--ink)}
select{padding-right:6px}
input[aria-invalid=true]{border-color:var(--err);background:var(--err-bg)}
.pair{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.7fr);gap:8px}
.pair .cell:only-child{grid-column:1/-1}
.fields-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 10px}
.err{margin:4px 0 0;padding:6px 10px;color:var(--err);background:var(--err-bg);border-left:4px solid var(--err);border-radius:4px;font-size:.92rem}
.hint,.note{font-size:.9rem;color:var(--muted);margin:3px 0 0}
.check{display:flex;align-items:center;gap:8px;min-height:44px;font-size:.95rem}
.check input{width:22px;height:22px;margin:0}
.rows{display:grid;gap:10px;margin:0 0 10px}
.row{border:1px solid var(--line);border-radius:10px;padding:10px;background:#f8fbfb}
.row-head{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:6px}
.row-title{font-weight:700;margin:0}
.row .grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:0 10px}

.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:8px 16px;font:inherit;font-weight:600;border-radius:10px;border:2px solid var(--brand);background:var(--brand);color:#fff;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--brand-d);border-color:var(--brand-d);color:#fff}
.btn.ghost{background:#fff;color:var(--brand)}.btn.ghost:hover{background:var(--accent);color:var(--brand-d)}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn.small{padding:4px 12px;font-size:.92rem}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:12px}
.status{font-size:.92rem;color:var(--ok);font-weight:600}
textarea{margin-top:8px;font-size:.95rem}

/* results */
.results{background:#fff;border:1px solid var(--line);border-left:6px solid var(--brand);border-radius:12px;padding:12px 14px;min-height:12.5rem}
.res-label{margin:0;font-size:.9rem;font-weight:600;color:var(--muted)}
.res-main{margin:0;font-size:2rem;line-height:1.2;font-weight:800;color:var(--brand);word-break:break-word}
@media (min-width:700px){.res-main{font-size:2.4rem}}
.res-others{margin:4px 0 0;min-height:1.55em;font-weight:600}
.res-lines{margin:8px 0 0;padding-left:1.2em}.res-lines li{margin:2px 0}
.res-formula{margin:8px 0 0;min-height:1.55em;color:var(--muted);font-size:.95rem;word-break:break-word}
.res-cost{margin:4px 0 0;font-weight:700;word-break:break-word}
.handoff{margin:12px 0 0}.handoff h3{margin:0 0 4px;font-size:1rem}
.handoff ul{list-style:none;margin:0;padding:0}
.handoff a{display:inline-flex;align-items:center;min-height:44px}

/* content */
.tbl{overflow-x:auto;margin:10px 0}
.tbl:focus-visible{outline:3px solid var(--focus)}
table{border-collapse:collapse;width:100%;background:#fff}
th,td{border:1px solid var(--line);padding:7px 10px;text-align:left;vertical-align:top}
th{background:var(--accent)}
caption{caption-side:top;text-align:left;font-weight:700;padding:4px 0}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}
.steps{padding-left:1.4em}.steps li{margin:5px 0}
.content ul{padding-left:1.3em}
.qa{border-top:1px solid var(--line);padding-top:2px}
.qa h3{margin-top:14px}
.related ul{columns:2 260px;padding-left:1.2em;margin:0}.related li{margin:2px 0}.related a{display:inline-block;padding:9px 0}
.cols-list{list-style:none;padding:0}.cols-list li{margin:0}.cols-list a{display:inline-flex;align-items:center;min-height:44px}
.eg{background:var(--accent);border-radius:10px;padding:10px 14px}

/* footer */
.site-foot{background:#10262a;color:#e4efef;padding:20px 0 26px;margin-top:20px;font-size:.93rem}
.site-foot a{color:#bfe4e6}
.foot-brand{font-weight:700;margin:0 0 4px}
.foot-links{display:flex;flex-wrap:wrap;gap:0 14px}
.foot-links a{display:inline-flex;align-items:center;min-height:44px}
.site-foot p{margin:4px 0}

@media (prefers-reduced-motion:no-preference){.btn,.tab span{transition:background-color .15s,border-color .15s}}

@media print{
 @page{margin:12mm}
 body{background:#fff;color:#000;font-size:11pt}
 .site-head,.site-foot,.crumbs,.skip,.page-content,.actions-wrap,.tabs,.btn,.handoff,.intro,.hint,.note,.status,textarea,noscript{display:none!important}
 .tool,.panel,.results,.row{background:#fff!important;border:1px solid #000!important;color:#000}
 .res-main,.res-label,.res-formula{color:#000!important}
 input[type=text],select{border:1px solid #000;background:#fff;color:#000}
 a{color:#000;text-decoration:none}
 [data-panel][hidden]{display:none!important}
}