:root{
  --bg:#f6f7fb; --card:#fff; --ink:#14172b; --muted:#5b6078; --line:#e3e6f0;
  --brand:#4f46e5; --brand2:#14b8a6; --brand-ink:#fff; --soft:#eef0ff; --warn:#b45309; --warnbg:#fff7e6; --err:#b91c1c; --errbg:#fef2f2; --ok:#047857;
  --radius:14px; --shadow:0 1px 2px rgba(20,23,43,.06),0 6px 24px rgba(20,23,43,.06);
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0f1221;--card:#181c33;--ink:#eef0ff;--muted:#a3a9c8;--line:#2a2f52;--soft:#222752;--warnbg:#3a2a10;--warn:#fbbf24;--errbg:#3b1717;--err:#fca5a5;--ok:#34d399;--shadow:none}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--brand)} 
@media (prefers-color-scheme:dark){a{color:#a5b4fc}}
.wrap{max-width:960px;margin:0 auto;padding:0 16px}
header.site{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
header.site .wrap{display:flex;align-items:center;gap:12px;min-height:56px;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:1.15rem;color:var(--ink);text-decoration:none}
.logo svg{width:28px;height:28px;border-radius:7px}
nav.main{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}
nav.main a{padding:6px 10px;border-radius:8px;text-decoration:none;color:var(--muted);font-size:.95rem}
nav.main a:hover,nav.main a[aria-current]{background:var(--soft);color:var(--ink)}
main{padding:20px 0 40px}
h1{font-size:1.75rem;line-height:1.2;margin:.2em 0 .3em}
h2{font-size:1.25rem;margin:1.6em 0 .4em}
h3{font-size:1.05rem;margin:1.2em 0 .3em}
.lead{color:var(--muted);font-size:1.05rem;margin:0 0 18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin:14px 0}
.hero{padding:26px 0 8px}
.hero h1{font-size:2rem}
.grid{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:700px){.grid.cols3{grid-template-columns:repeat(3,1fr)} .grid.cols2{grid-template-columns:1fr 1fr}}
a.toolcard{display:block;text-decoration:none;color:inherit;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow);transition:transform .12s,border-color .12s}
a.toolcard:hover{transform:translateY(-2px);border-color:var(--brand)}
a.toolcard .ico{font-size:1.8rem}
a.toolcard h2{margin:.3em 0 .2em;font-size:1.1rem;color:var(--ink)}
a.toolcard p{margin:0;color:var(--muted);font-size:.95rem}
label,.lbl{display:block;font-size:.85rem;font-weight:600;color:var(--muted);margin:0 0 4px}
input[type=text],input[type=number],select{width:100%;font:inherit;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 12px;min-height:44px}
input:focus,select:focus,button:focus-visible,a:focus-visible{outline:3px solid color-mix(in srgb,var(--brand) 45%,transparent);outline-offset:1px}
.money{position:relative}
.money:before{content:"$";position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--muted);pointer-events:none}
.money input{padding-left:26px}
.row{display:grid;gap:10px;grid-template-columns:1fr 1fr;align-items:end;border:1px solid var(--line);border-radius:12px;padding:12px;margin:10px 0;background:color-mix(in srgb,var(--card) 70%,var(--bg))}
.row .span2{grid-column:1/-1}
@media(min-width:760px){
  .row.rent{grid-template-columns:1.4fr 1fr auto 1fr auto}
  .row.bill{grid-template-columns:2fr 1fr auto}
  .row.pbill{grid-template-columns:2fr 1fr auto}
  .row.person{grid-template-columns:1fr auto}
  .row .span2{grid-column:auto}
}
.check{display:flex;align-items:center;gap:8px;min-height:44px;font-weight:500;color:var(--ink);margin:0;cursor:pointer}
.check input{width:20px;height:20px;accent-color:var(--brand)}
.btn{font:inherit;font-weight:600;border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:10px;padding:10px 14px;min-height:44px;cursor:pointer}
.btn:hover{border-color:var(--brand)}
.btn.primary{background:linear-gradient(135deg,var(--brand),#6d5dfc);color:#fff;border-color:transparent}
.btn.ghost{background:transparent}
.btn.icon{padding:0 12px;min-width:44px}
.btn.danger{color:var(--err)}
.methods{display:grid;gap:8px}
.method{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);border-radius:12px;padding:10px 12px;cursor:pointer;background:var(--bg)}
.method input{margin-top:4px;width:18px;height:18px;accent-color:var(--brand)}
.method.on{border-color:var(--brand);background:var(--soft)}
.method b{display:block}
.method span{color:var(--muted);font-size:.9rem}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{display:inline-flex;gap:6px;align-items:center;border:1px solid var(--line);border-radius:999px;padding:6px 12px;min-height:36px;cursor:pointer;background:var(--bg);font-size:.9rem}
.chip.on{background:var(--soft);border-color:var(--brand);font-weight:600}
.chip input{position:absolute;opacity:0;pointer-events:none}
.results{display:grid;gap:10px;margin:10px 0}
.person-result{border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:var(--card)}
.person-result .top{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.person-result .nm{font-weight:700;overflow-wrap:anywhere}
.person-result .amt{font-size:1.4rem;font-weight:800;color:var(--ink);white-space:nowrap}
.person-result .sub{color:var(--muted);font-size:.88rem;margin-top:2px}
.bar{height:6px;border-radius:99px;background:var(--line);margin-top:8px;overflow:hidden}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--brand2),var(--brand))}
.totalline{display:flex;justify-content:space-between;font-weight:700;padding:10px 4px;border-top:2px solid var(--line)}
.pay{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--card)}
.pay .arrow{color:var(--brand2);font-weight:800}
.notice{border-radius:10px;padding:10px 12px;margin:10px 0;font-size:.92rem}
.notice.err{background:var(--errbg);color:var(--err)}
.notice.warn{background:var(--warnbg);color:var(--warn)}
.notice.info{background:var(--soft);color:var(--ink)}
.sharebar{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 4px}
.sharebar .btn{flex:1 1 140px}
.small{font-size:.88rem;color:var(--muted)}
.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);background:#14172b;color:#fff;padding:10px 16px;border-radius:10px;opacity:0;pointer-events:none;transition:.2s;z-index:50;max-width:90vw}
.toast.show{opacity:1;transform:translate(-50%,0)}
details{border:1px solid var(--line);border-radius:12px;padding:10px 14px;margin:8px 0;background:var(--card)}
summary{cursor:pointer;font-weight:600}
details p{margin:.6em 0 0}
table.ex{border-collapse:collapse;width:100%;font-size:.95rem}
table.ex th,table.ex td{border-bottom:1px solid var(--line);padding:6px 8px;text-align:left}
table.ex td.n,table.ex th.n{text-align:right;font-variant-numeric:tabular-nums}
code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.85rem}
pre{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:12px;overflow:auto;white-space:pre-wrap;word-break:break-all}
.cta{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border-radius:var(--radius);padding:22px 18px;text-align:center;margin:30px 0 10px}
.cta h2{margin:0 0 6px;color:#fff}
.cta p{margin:0 0 14px;opacity:.95}
.cta a.btn{background:#fff;color:#14172b;text-decoration:none;display:inline-block;border:0}
footer.site{border-top:1px solid var(--line);padding:22px 0 40px;color:var(--muted);font-size:.9rem;background:var(--card)}
footer.site a{color:var(--muted)}
footer.site .links{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:8px}
.crumbs{font-size:.88rem;color:var(--muted);margin-bottom:4px}
.crumbs a{color:var(--muted)}
.prose p,.prose li{max-width:70ch}
.example-box{background:var(--soft);border-radius:12px;padding:12px 14px}
.hide{display:none!important}
body.embed{background:transparent}
body.embed main{padding:8px 0}
body.embed .card{margin:8px 0;box-shadow:none}
.powered{text-align:center;font-size:.8rem;color:var(--muted);padding:6px 0 10px}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
.row.person{grid-template-columns:1fr auto}
.row>.btn.icon{justify-self:end}