:root{--ink:#1b1f24;--muted:#5b6470;--line:#e2e5e9;--bg-soft:#f6f7f8;--card:#fff;--primary:#1c64a8;--primary-d:#154f86;--teal:#0f8f88;--teal-d:#17695a;--tint:#eef7f5;--amber:#b7791f;--amber-bg:#fff7e6;--red:#c53030;--red-bg:#fff1f1;--navy:#18476f;
--sans:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:15px/1.55 var(--sans);color:var(--ink);background:#fff;overflow-x:hidden}
h1,h2,h3{line-height:1.2;letter-spacing:-.01em}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}.narrow{max-width:860px}
[hidden]{display:none!important}
/* top bar */
.topbar{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:5}
.topbar-in{display:flex;align-items:center;justify-content:space-between;height:58px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:19px;color:var(--ink);text-decoration:none}
.brand-mark{width:28px;height:28px}
.topbar-link{color:var(--primary);text-decoration:none;font-weight:600;font-size:14px}
/* hero */
.hero{padding:44px 0 36px}
.hero-in{display:grid;grid-template-columns:1.25fr 1fr;gap:40px;align-items:center}
.eyebrow{margin:0 0 8px;color:var(--teal);font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}
h1{font-size:40px;margin:0 0 14px}
.lede{font-size:18px;margin:0 0 12px;color:#2a3038}.sub{color:var(--muted);margin:0}
.callout{background:var(--tint);border-left:4px solid var(--teal);border-radius:4px;padding:18px 20px}
.callout p{margin:0}.callout-title{font-weight:700;color:var(--teal-d);font-size:13px;text-transform:uppercase;letter-spacing:.05em;margin-bottom:6px!important}
/* calc area */
.calc-area{background:var(--bg-soft);padding:30px 0 40px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.tabs{display:inline-flex;flex-wrap:wrap;gap:4px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:4px;margin-bottom:18px;max-width:100%}
.tabs button{border:0;background:transparent;color:var(--muted);font:600 14px var(--sans);padding:9px 16px;border-radius:7px;cursor:pointer}
.tabs button:hover{color:var(--ink);background:var(--bg-soft)}
.tabs button.on{background:var(--primary);color:#fff}
.layout{display:grid;grid-template-columns:minmax(0,410px) minmax(0,1fr);gap:22px;align-items:start}
.col-inputs,.col-results{min-width:0}

.card{background:var(--card);border:1px solid var(--line);border-radius:8px;box-shadow:0 1px 2px rgba(16,24,40,.05),0 2px 8px rgba(16,24,40,.04);padding:20px;margin-bottom:16px}
.card-title{font-size:16px;margin:0 0 14px}
.sub-title{font-size:14px;margin:16px 0 10px;color:var(--navy)}
.subcard{border:1px solid var(--line);border-radius:6px;padding:4px 14px 14px;margin-bottom:12px;background:#fcfcfd}
.subcard .sub-title{margin-top:10px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.span2{grid-column:1/-1}
label{display:flex;flex-direction:column;gap:5px;font-size:13px;font-weight:600;color:#39414b;min-width:0}
label small{font-weight:400;color:var(--muted);font-size:12px;line-height:1.35}
input[type=number],input[type=text],input:not([type]),select{width:100%;min-width:0;font:16px var(--sans);color:var(--ink);background:#fff;border:1px solid #d5d9df;border-radius:4px;padding:9px 10px;height:40px}
input:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(28,100,168,.15)}
label.check{flex-direction:row;align-items:center;gap:8px;font-weight:500;margin-top:4px}
label.check input{width:16px;height:16px;accent-color:var(--primary)}
.note{font-size:13px;color:var(--muted);margin:10px 0 0}
/* roles */
.roles{display:flex;flex-direction:column;gap:10px}
.role{border:1px solid var(--line);border-radius:6px;padding:12px;background:#fcfcfd;position:relative}
.role .grid2{gap:10px}
.role-head{display:flex;gap:8px;align-items:flex-end;margin-bottom:10px}
.role-head label{flex:1}
.del{border:1px solid #e3c4c4;background:#fff;color:var(--red);border-radius:4px;height:40px;width:40px;cursor:pointer;font-size:16px;flex:none}
/* buttons */
.btn,.btn-ghost{font:600 14px var(--sans);border-radius:4px;padding:10px 16px;cursor:pointer;margin:0}
.btn{background:var(--primary);color:#fff;border:1px solid var(--primary)}.btn:hover{background:var(--primary-d)}
.btn-ghost{background:#fff;color:var(--primary);border:1px solid #c9d6e4}.btn-ghost:hover{background:#f2f6fb}
#addRole{margin-top:10px;width:100%}
.actions{display:flex;flex-wrap:wrap;gap:8px}
/* results */
.res-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:16px}
.res-head .lbl{font-size:13px;color:var(--muted);font-weight:600;margin-top:6px}
.headline{font-size:40px;font-weight:700;line-height:1;letter-spacing:-.02em;text-align:right;overflow-wrap:anywhere}
.headline small{display:block;font-size:13px;font-weight:500;color:var(--muted);letter-spacing:0;margin-top:6px}
.compare{background:var(--bg-soft);border-radius:6px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;text-align:center;padding:16px 10px;margin-bottom:14px}
.compare>div{min-width:0}.compare .k{font-size:11px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:#3d4550}
.compare .v{font-size:28px;font-weight:700;margin-top:4px;overflow-wrap:anywhere}
.compare .v.good{color:var(--teal-d)}.compare .vs{color:#9aa3ad;font-size:12px;font-weight:700;padding:0 8px}
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin-bottom:14px}
.tile{border:1px solid var(--line);border-left:3px solid var(--teal-d);border-radius:4px;padding:10px 12px;min-width:0}
.tile.blue{border-left-color:var(--navy)}.tile.amber{border-left-color:var(--amber)}.tile.red{border-left-color:var(--red)}
.tile .k{overflow-wrap:anywhere;font-size:12px;color:var(--muted)}.tile .v{font-size:19px;font-weight:700;margin-top:2px;overflow-wrap:anywhere}
.status{border-radius:4px;padding:12px 14px;margin:0 0 14px;font-size:14px;border-left:4px solid}
.status strong{display:block;font-size:12px;letter-spacing:.06em;text-transform:uppercase;margin-bottom:2px}
.status.ok{background:var(--tint);border-color:var(--teal);color:#17463e}
.status.warn{background:var(--amber-bg);border-color:var(--amber);color:#6b4a10}
.status.bad{background:var(--red-bg);border-color:var(--red);color:#6b1a1a}
.bars{margin:6px 0 14px}.bar-row{display:grid;grid-template-columns:minmax(60px,120px) minmax(40px,1fr) auto;gap:8px;align-items:center;font-size:13px;margin:6px 0}
.bar-row .name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#3d4550}
.bar-track{background:#edf0f3;border-radius:3px;height:12px;overflow:hidden}.bar-fill{height:100%;background:var(--navy);border-radius:3px}
.bar-row:nth-child(2n) .bar-fill{background:var(--teal-d)}.bar-row .amt{text-align:right;font-variant-numeric:tabular-nums}
.sec-title{font-size:13px;font-weight:700;margin:16px 0 6px;color:#2a3038}
.tw{overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%}
table{border-collapse:collapse;width:100%;font-size:13.5px;font-variant-numeric:tabular-nums}
th{font-size:12px;color:var(--muted);font-weight:600;text-align:left;border-bottom:1px solid var(--line);padding:7px 8px;white-space:nowrap}
td{border-bottom:1px solid #eef0f2;padding:7px 8px;white-space:nowrap}
td.n,th.n{text-align:right}tr.tot td{font-weight:700;background:#f3f7fa;border-bottom:1px solid var(--line)}
.warn{color:var(--red);font-weight:600;margin:0 0 10px}
.formula{font:12.5px/1.6 var(--mono);color:#1f4d45;background:var(--tint);border-left:3px solid var(--teal);padding:10px 12px;border-radius:4px;white-space:pre-wrap;overflow-wrap:anywhere;margin-top:14px}
.big{display:none}
/* content */
.content{padding:44px 0 30px}
.content h2{font-size:26px;margin:34px 0 12px}.content h2:first-child{margin-top:0}
.content p{color:#353c45}
.formula-line{font:13.5px var(--mono);color:#1f4d45;background:var(--tint);border-left:3px solid var(--teal);padding:11px 14px;margin:10px 0;border-radius:3px;white-space:pre-wrap;overflow-wrap:anywhere}
.example{border:1px solid var(--line);border-radius:6px;padding:14px 16px;margin-top:16px}
.example-title{font-weight:700;margin:0 0 6px!important}.example pre{margin:0;font:13px/1.6 var(--mono);white-space:pre-wrap;color:#333}
.ref-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;border:1px solid var(--line);border-radius:6px;padding:12px}
.ref-item{display:flex;justify-content:space-between;gap:10px;background:var(--bg-soft);border-radius:4px;padding:10px 12px;font-size:14px;border:0;cursor:pointer;font-family:var(--sans);color:var(--ink);text-align:left}
.ref-item:hover{background:#e9f1f8}.ref-item b{color:var(--teal-d);white-space:nowrap}
.faq details{border-bottom:1px solid var(--line);padding:2px 0}
.faq summary{cursor:pointer;font-weight:600;padding:12px 28px 12px 0;list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:9px;font-size:20px;color:var(--primary)}
.faq details[open] summary::after{content:"–"}
.faq details p{margin:0 0 14px}
.disclaimer{margin-top:22px}
.foot{border-top:1px solid var(--line);padding:18px 0;color:var(--muted);font-size:13px}
/* responsive */
@media(max-width:960px){.layout{grid-template-columns:1fr}.col-results{position:static}.hero-in{grid-template-columns:1fr;gap:20px}}
@media(max-width:560px){.wrap{padding:0 14px}h1{font-size:30px}.lede{font-size:16px}.hero{padding:26px 0}
 .card{padding:16px}.headline{font-size:30px}.compare .v{font-size:22px}.tabs{display:flex}.tabs button{flex:1 1 auto;padding:8px 10px;font-size:13px}
 .ref-grid{grid-template-columns:1fr}.bar-row{grid-template-columns:minmax(50px,80px) minmax(30px,1fr) auto}.content h2{font-size:22px}.res-head{flex-direction:column}.headline{text-align:left}}
@media(max-width:360px){.grid2{grid-template-columns:1fr}}
/* print */
@media print{.noprint,.topbar,.hero,.tabs{display:none!important}body{background:#fff;font-size:12px}.calc-area{background:#fff;border:0;padding:0}
 .layout{display:block}.col-results{position:static}.card{box-shadow:none;break-inside:avoid;border-color:#ccc}.tab[hidden]{display:none!important}
 input,select{border:1px solid #bbb;height:auto;padding:3px 5px;font-size:12px}.tw{overflow:visible}}
input:disabled,select:disabled{background:#f1f3f5;color:#98a1ab;cursor:not-allowed}
.ben-dep:has(:disabled){color:#98a1ab}
/* v4 additions */
details.adv{border:1px solid var(--line);border-radius:6px;margin-top:14px;background:#fcfcfd}
details.adv>summary{cursor:pointer;font-weight:600;font-size:14px;color:var(--navy);padding:11px 14px;list-style:none;position:relative}
details.adv>summary::-webkit-details-marker{display:none}
details.adv>summary::after{content:"+";position:absolute;right:14px;top:8px;font-size:18px;color:var(--primary)}
details.adv[open]>summary::after{content:"–"}
details.adv>*:not(summary){margin-left:14px;margin-right:14px}
details.adv>.grid2:last-child,details.adv>div:last-child{margin-bottom:14px}
details.adv .note{margin-top:0;margin-bottom:10px}
details.math{margin-top:14px}details.math>summary{cursor:pointer;font-weight:600;font-size:13px;color:var(--primary)}
details.math .formula{margin-top:8px}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(20px);background:#1b1f24;color:#fff;padding:10px 16px;border-radius:6px;font-size:14px;opacity:0;pointer-events:none;transition:.2s;z-index:50;max-width:90vw}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.share-box{margin:10px 0 0}.share-box input{font-size:13px;font-family:var(--mono)}
.ref-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.ref-col{display:flex;flex-direction:column;gap:6px;min-width:0}
.ref-h{font-size:15px;margin:2px 0 4px}.ref-h small{font-weight:400;color:var(--muted);font-size:12px}
.hint{font-size:12px;color:var(--teal-d)}
@media print{details.adv{border:0}details.adv:not([open]){display:none}.share-box{display:none}}
.sc-save{display:inline-flex;gap:6px;flex-wrap:wrap;align-items:center;max-width:100%}
.sc-save input{height:40px;width:180px;max-width:100%}
.sc-list{display:flex;flex-direction:column;gap:8px}
.sc-item{display:flex;justify-content:space-between;align-items:center;gap:8px;border:1px solid var(--line);border-radius:6px;padding:8px 10px;background:#fcfcfd}
.sc-item label{align-items:flex-start;min-width:0}.sc-item label span{display:flex;flex-direction:column;min-width:0;overflow-wrap:anywhere}.sc-item small{font-weight:400;color:var(--muted)}
.sc-btns{display:flex;gap:6px;flex:none}.btn-ghost.sm{padding:6px 10px;font-size:13px}
table.cmp td,table.cmp th{white-space:normal;min-width:90px}
.sec-sub{font:600 13px var(--sans);color:var(--ink);margin:6px 0 8px}.sec-sub small{font-weight:400;color:var(--muted)}
textarea{width:100%;max-width:100%;font:13px var(--mono,monospace);border:1px solid var(--line);border-radius:6px;padding:8px;resize:vertical;box-sizing:border-box}
.btn-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.hchart{display:flex;align-items:flex-end;gap:2px;height:140px;padding:6px 0 18px;margin:8px 0 4px;border-bottom:1px solid var(--line)}
.hc-col{position:relative;flex:1;height:100%;display:flex;align-items:flex-end;min-width:0}
.hc-bar{width:100%;background:var(--primary);opacity:.75;border-radius:2px 2px 0 0}.hc-bar.short{background:var(--red,#c0392b)}
.hc-req{position:absolute;left:-1px;right:-1px;height:2px;background:#111}
.hc-col span{position:absolute;bottom:-17px;left:0;font-size:10px;color:var(--muted)}
.lg{display:inline-block;width:10px;height:10px;margin:0 3px 0 8px;vertical-align:middle}.lg-bar{background:var(--primary);opacity:.75}.lg-req{height:2px;background:#111}.lg-short{background:var(--red,#c0392b)}
table.rot td,table.rot th{padding:3px 4px;text-align:center;font-size:12px;min-width:22px}table.rot td:first-child,table.rot th:first-child{text-align:left;white-space:nowrap}
table.rot td.on{background:#e6f2ef;font-weight:600}table.rot td.short,tr.short td{color:var(--red,#c0392b)}