@font-face{font-family:"Familjen Grotesk";src:url(/assets/fonts/familjen-grotesk-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Familjen Grotesk";src:url(/assets/fonts/familjen-grotesk-latin-500-normal.woff2) format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"Familjen Grotesk";src:url(/assets/fonts/familjen-grotesk-latin-600-normal.woff2) format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Familjen Grotesk";src:url(/assets/fonts/familjen-grotesk-latin-700-normal.woff2) format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/assets/fonts/ibm-plex-mono-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/assets/fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/assets/fonts/ibm-plex-mono-latin-600-normal.woff2) format("woff2");font-weight:600;font-display:swap}

/* Layout: tool first, reference content below. Results shown as a receipt. */
:root{
  --bg:#EEF2F0; --surface:#FFFFFF; --paper:#FAFCFB; --ink:#13201B; --muted:#56665F;
  --line:#D3DCD8; --accent:#0A6B58; --accent-ink:#FFFFFF; --accent-soft:#DDEFE9;
  --warn:#9A4A08; --warn-soft:#F8E8D6;
  --f-display:"Familjen Grotesk","Helvetica Neue",Arial,sans-serif;
  --f-body:"Familjen Grotesk","Helvetica Neue",Arial,sans-serif;
  --f-num:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
  --r:10px; color-scheme:light;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0E1412; --surface:#151D1A; --paper:#19231F; --ink:#E6EEEA; --muted:#97A8A1;
  --line:#2A3833; --accent:#45C6A6; --accent-ink:#04211A; --accent-soft:#163A31;
  --warn:#E8A865; --warn-soft:#3A2915; color-scheme:dark}}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.55;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));padding-block:0 40px}
.wrap{max-width:1080px;margin:0 auto}
a{color:var(--accent)}
h1,h2,h3{font-family:var(--f-display);text-wrap:balance;line-height:1.15;margin:0}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.num{font-family:var(--f-num);font-variant-numeric:tabular-nums}
[hidden]{display:none!important}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

header.top{display:flex;align-items:center;justify-content:space-between;gap:12px 20px;padding-block:18px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:var(--f-display);font-weight:700;font-size:1.25rem;letter-spacing:-.01em}
.stamp{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;border:2px solid var(--accent);color:var(--accent);font-family:var(--f-num);font-weight:600;font-size:.95rem;transform:rotate(-8deg)}
nav.top{display:flex;gap:6px 16px;flex-wrap:wrap;font-size:.95rem}
nav.top a{color:var(--muted);text-decoration:none;padding:2px 0;border-bottom:2px solid transparent}
nav.top a:hover{color:var(--ink)}
nav.top a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--accent)}

.crumbs{font-size:.85rem;color:var(--muted);margin-bottom:6px}
.crumbs a{color:var(--muted)}
.hero{padding-block:8px 18px}
.hero h1{font-size:clamp(1.9rem,4.5vw,2.8rem);letter-spacing:-.02em;font-weight:700}
.hero p{margin:.4rem 0 0;color:var(--muted);max-width:62ch}

.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line)}
.tab{appearance:none;background:none;border:0;border-bottom:2px solid transparent;padding:10px 14px;cursor:pointer;color:var(--muted);font-weight:600;margin-bottom:-1px}
.tab[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--accent)}
.tool{background:var(--surface);border:1px solid var(--line);border-top:0;border-radius:0 0 var(--r) var(--r);padding:22px}
@media (max-width:480px){.tool{padding:16px}}
.calc{display:grid;grid-template-columns:1fr;gap:22px}
@media (min-width:820px){.calc{grid-template-columns:minmax(0,1.05fr) minmax(0,1fr)}}

.lbl{display:block;font-size:.8rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.amount{position:relative}
.amount input{width:100%;font-family:var(--f-num);font-size:clamp(1.8rem,5vw,2.4rem);font-weight:500;padding:12px 56px 12px 14px;border:2px solid var(--line);border-radius:var(--r);background:var(--paper);font-variant-numeric:tabular-nums}
.amount input:focus{border-color:var(--accent);outline:none}
.amount .unit{position:absolute;right:16px;top:50%;transform:translateY(-50%);color:var(--muted);font-family:var(--f-num)}
.interp{min-height:1.4em;margin-top:6px;font-size:.88rem;color:var(--muted)}
.interp.err{color:var(--warn)}

.seg{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);border-radius:var(--r);padding:3px;background:var(--bg)}
.seg button{appearance:none;border:0;background:none;padding:10px 8px;border-radius:7px;cursor:pointer;text-align:center;line-height:1.25}
.seg button b{display:block;font-weight:600}
.seg button span{display:block;font-size:.8rem;color:var(--muted)}
.seg button[aria-pressed="true"]{background:var(--surface);box-shadow:0 1px 3px rgba(0,0,0,.12)}
.seg button[aria-pressed="true"] b{color:var(--accent)}

.rates{display:flex;flex-wrap:wrap;gap:8px}
.rate{appearance:none;border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:7px 14px;cursor:pointer;display:flex;align-items:baseline;gap:8px}
.rate b{font-family:var(--f-num);font-weight:600}
.rate span{font-size:.82rem;color:var(--muted)}
.rate[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.rate[aria-pressed="true"] span{color:var(--accent-ink);opacity:.85}
.custom{display:flex;align-items:center;gap:6px;border:1px dashed var(--line);border-radius:999px;padding:3px 12px}
.custom .lbl{margin:0}
.custom input{width:4.2em;border:0;background:none;font-family:var(--f-num);padding:4px 0;text-align:right}
.custom input:focus{outline:none}
.custom.on{border-style:solid;border-color:var(--accent)}
.stack{display:flex;flex-direction:column;gap:18px}

.receipt{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:18px 18px 14px;position:relative}
.receipt::before{content:"";position:absolute;left:14px;right:14px;top:-1px;border-top:2px dashed var(--bg)}
.rhead{display:flex;justify-content:space-between;align-items:baseline;gap:10px;margin-bottom:6px}
.rhead h2{font-size:1rem;font-weight:600}
.rhead small{color:var(--muted);font-family:var(--f-num);font-size:.78rem}
.row{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;gap:10px;padding:11px 0;border-top:1px dashed var(--line)}
.rhead + .row,.rhead + div > .row:first-child{border-top:0}
.row .k{font-size:.95rem}
.row .k small{display:block;color:var(--muted);font-size:.78rem}
.row .v{font-family:var(--f-num);font-variant-numeric:tabular-nums;font-size:1.15rem;font-weight:500;text-align:right;white-space:nowrap}
.row.primary .v{font-size:1.55rem;font-weight:600;color:var(--accent)}
.row.primary .k{font-weight:600}
@media (max-width:420px){.row .v{font-size:1rem}.row.primary .v{font-size:1.3rem}.copy{min-width:0!important}}
.copy{appearance:none;border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:7px 10px;cursor:pointer;font-size:.85rem;font-weight:600;display:inline-flex;align-items:center;gap:6px;min-width:92px;justify-content:center}
.copy:hover{border-color:var(--accent);color:var(--accent)}
.copy.done{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.copy svg{width:15px;height:15px}
.formula{margin-top:8px;padding-top:10px;border-top:1px solid var(--line);font-family:var(--f-num);font-size:.82rem;color:var(--muted);display:flex;flex-direction:column;gap:2px;overflow-wrap:anywhere}
.ractions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;margin-top:12px}
.btn{appearance:none;border:0;background:var(--accent);color:var(--accent-ink);border-radius:8px;padding:10px 14px;font-weight:600;cursor:pointer;display:inline-flex;gap:8px;align-items:center;text-decoration:none}
.btn.ghost{background:none;color:var(--accent);border:1px solid var(--line)}
.btns{display:flex;flex-wrap:wrap;gap:8px}
.fmt{display:flex;align-items:center;gap:6px;font-size:.85rem;color:var(--muted)}
.fmt select{border:1px solid var(--line);background:var(--surface);border-radius:6px;padding:5px 6px;font-family:var(--f-num);font-size:.85rem}
.hint{font-size:.82rem;color:var(--muted);margin-top:8px}
kbd{font-family:var(--f-num);font-size:.75rem;border:1px solid var(--line);border-bottom-width:2px;border-radius:4px;padding:0 5px;background:var(--surface)}

.history h3{font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-weight:600;margin-bottom:6px}
.history ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
.history li button{appearance:none;width:100%;text-align:left;border:0;background:none;padding:6px 8px;border-radius:6px;cursor:pointer;display:flex;justify-content:space-between;gap:10px;font-family:var(--f-num);font-size:.85rem;color:var(--muted)}
.history li button:hover{background:var(--bg);color:var(--ink)}
.empty{font-size:.85rem;color:var(--muted)}

.inv-top{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center;margin-bottom:14px}
.inv-top p{margin:0;color:var(--muted);font-size:.92rem;max-width:60ch}
.inv-top .seg{min-width:min(100%,260px)}
.tblwrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r)}
table.inv{width:100%;border-collapse:collapse;min-width:620px}
table.inv th{font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:600;text-align:left;padding:10px;background:var(--bg);border-bottom:1px solid var(--line)}
table.inv td{padding:6px 8px;border-bottom:1px solid var(--line);vertical-align:middle}
table.inv tr:last-child td{border-bottom:0}
table.inv input,table.inv select{width:100%;border:1px solid transparent;background:transparent;padding:7px 6px;border-radius:6px}
table.inv input:hover,table.inv select:hover{border-color:var(--line)}
table.inv input:focus,table.inv select:focus{border-color:var(--accent);outline:none;background:var(--paper)}
table.inv .n{text-align:right;font-family:var(--f-num);font-variant-numeric:tabular-nums}
.del{appearance:none;border:0;background:none;color:var(--muted);cursor:pointer;padding:6px;border-radius:6px;font-size:1.1rem;line-height:1}
.del:hover{color:var(--warn);background:var(--warn-soft)}
.inv-bottom{display:grid;grid-template-columns:1fr;gap:18px;margin-top:16px}
@media (min-width:820px){.inv-bottom{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}}
.tag{display:inline-block;font-size:.72rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;padding:2px 8px;border-radius:999px;background:var(--warn-soft);color:var(--warn)}
.tag.ok{background:var(--accent-soft);color:var(--accent)}

section.block{margin-top:44px}
section.block > h2{font-size:clamp(1.4rem,3vw,1.85rem);letter-spacing:-.01em;margin-bottom:6px}
section.block > p.lead{margin:0 0 18px;color:var(--muted);max-width:65ch}
.prose{max-width:68ch}
.prose p{margin:0 0 12px}
.prose h3{font-size:1.15rem;margin:22px 0 8px}
.prose ul{margin:0 0 12px;padding-left:1.2em}
.prose li{margin-bottom:4px}
.formulas{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr));gap:10px;margin:14px 0 18px}
.fbox{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px}
.fbox .lbl{margin-bottom:4px}
.fbox .num{font-size:1.15rem;font-weight:500}
.fbox p{margin:4px 0 0;font-size:.88rem;color:var(--muted)}

.finder{display:grid;gap:14px}
.search{width:100%;max-width:520px;padding:12px 14px;border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
.search:focus{border-color:var(--accent);outline:none}
.items{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:8px}
.item{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 12px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:12px 14px}
.item .t{font-weight:500;min-width:0}
.item .d{grid-column:1/-1;font-size:.84rem;color:var(--muted);margin-top:-2px}
.pct{font-family:var(--f-num);font-weight:600;font-size:.95rem;padding:3px 10px;border-radius:6px;border:1px solid var(--line);background:var(--paper);cursor:pointer;white-space:nowrap;color:var(--ink);text-decoration:none;display:inline-block}
.pct.use:hover{border-color:var(--accent);color:var(--accent)}
.pct.fixed{cursor:default;color:var(--muted)}
.noresult{color:var(--muted)}

.scroll{overflow-x:auto}
.rt{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--line);min-width:520px}
.rt th,.rt td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.rt th{font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:var(--bg)}
.rt td.n,.rt th.n{font-family:var(--f-num);font-variant-numeric:tabular-nums;white-space:nowrap;text-align:right}
.rt td.n:first-child{text-align:left}
.rt tr:last-child td{border-bottom:0}
.rt.narrow{min-width:420px;max-width:640px}

.news{display:grid;gap:10px}
.news article{display:grid;grid-template-columns:110px minmax(0,1fr);gap:6px 16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px}
.news .when{font-family:var(--f-num);font-size:.85rem;color:var(--muted)}
.news h3{font-size:1.02rem;font-weight:600;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.news p{margin:0;color:var(--muted);font-size:.93rem;grid-column:2}
@media (max-width:560px){.news article{grid-template-columns:1fr}.news p{grid-column:1}}

.faq details{border-bottom:1px solid var(--line);padding:4px 0}
.faq summary{cursor:pointer;padding:12px 0;font-weight:600;font-size:1.05rem;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--f-num);color:var(--accent);font-size:1.2rem}
.faq details[open] summary::after{content:"–"}
.faq .a{padding:0 0 14px;color:var(--muted);max-width:68ch}
.faq .a p{margin:0 0 8px}

.links{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,230px),1fr));gap:10px}
.links a{display:flex;flex-direction:column;gap:2px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;text-decoration:none;color:var(--ink)}
.links a:hover{border-color:var(--accent)}
.links a b{font-family:var(--f-display);font-weight:600}
.links a span{font-size:.88rem;color:var(--muted)}

footer{margin-top:56px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:.85rem;display:flex;flex-direction:column;gap:10px}
footer p{margin:0;max-width:75ch}
footer nav{display:flex;flex-wrap:wrap;gap:6px 16px}
footer nav a{color:var(--muted)}

.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%) translateY(20px);background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:8px;font-weight:600;font-size:.92rem;opacity:0;pointer-events:none;transition:opacity .18s,transform .18s;z-index:20;max-width:calc(100% - 32px)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media (prefers-reduced-motion:reduce){.toast{transition:none}}