/* Numbrik — layout: sticky utility bar; tool pages = live calculator first, explanation below, category rail on the left (moves under content on phones) */
@font-face{font-family:"Bricolage Grotesque";src:url(/assets/fonts/bricolage-500.woff2) format("woff2");font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:"Bricolage Grotesque";src:url(/assets/fonts/bricolage-700.woff2) format("woff2");font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url(/assets/fonts/plex-sans-400.woff2) format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url(/assets/fonts/plex-sans-500.woff2) format("woff2");font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url(/assets/fonts/plex-sans-600.woff2) format("woff2");font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/assets/fonts/plex-mono-500.woff2) format("woff2");font-weight:500;font-style:normal;font-display:swap}

:root{
  --bg:#F3F5F8; --surface:#FFFFFF; --sunk:#E8ECF2; --line:#D3D9E3;
  --ink:#121A2B; --muted:#566074; --accent:#2340C9; --accent-ink:#FFFFFF; --accent-soft:#E3E8FB;
  --mark:#F2B63A; --good:#1E7F4F; --bad:#B4372F; --shadow:rgba(18,26,43,.12);
  --f-display:"Bricolage Grotesque","Segoe UI",system-ui,sans-serif;
  --f-body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --f-num:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0E131D; --surface:#161D2B; --sunk:#1D2536; --line:#2C3649;
  --ink:#E7ECF5; --muted:#9AA5BA; --accent:#7C93FF; --accent-ink:#0E131D; --accent-soft:#232E52;
  --mark:#F2B63A; --good:#5BC38D; --bad:#F07E74; --shadow:rgba(0,0,0,.45); color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0E131D; --surface:#161D2B; --sunk:#1D2536; --line:#2C3649;
  --ink:#E7ECF5; --muted:#9AA5BA; --accent:#7C93FF; --accent-ink:#0E131D; --accent-soft:#232E52;
  --mark:#F2B63A; --good:#5BC38D; --bad:#F07E74; --shadow:rgba(0,0,0,.45); color-scheme:dark}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;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;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%}
[hidden]{display:none!important}
a{color:var(--accent)}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.wrap{max-width:1180px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:8px;z-index:20;background:var(--surface);padding:8px 12px;border-radius:8px}

/* ---------- header ---------- */
.bar{position:sticky;top:0;z-index:10;background:var(--surface);border-bottom:1px solid var(--line)}
.bar .wrap{display:flex;gap:12px 16px;align-items:center;padding-block:10px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--ink);margin-right:auto}
.brand svg{width:30px;height:30px;flex:none}
.brand b{font-family:var(--f-display);font-weight:700;font-size:23px;letter-spacing:-.02em}
.search{flex:1 1 260px;position:relative;order:2;min-width:0}
@media (min-width:760px){.search{order:0;max-width:440px}.brand{margin-right:0}.region{margin-left:auto}}
.search input{width:100%;background:var(--sunk);border:1px solid transparent;border-radius:10px;padding:9px 12px 9px 36px;font-size:15px}
.search input:focus{border-color:var(--accent);background:var(--surface);outline:none}
.search>svg{position:absolute;left:11px;top:50%;transform:translateY(-50%);color:var(--muted);pointer-events:none}
.qres{position:absolute;left:0;right:0;top:calc(100% + 6px);background:var(--surface);border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 32px var(--shadow);padding:6px;max-height:60vh;overflow:auto;z-index:15}
.qres a{display:flex;flex-direction:column;padding:8px 10px;border-radius:8px;text-decoration:none;color:var(--ink)}
.qres a:hover,.qres a:focus{background:var(--sunk);outline:none}
.qres a span{font-size:13px;color:var(--muted)}
.qres p{margin:8px 10px;color:var(--muted);font-size:14px}
.region{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:13px}
.region select{background:var(--sunk);border:1px solid var(--line);border-radius:8px;padding:7px 8px;font-size:14px;max-width:180px}
.theme{display:inline-flex;align-items:center;gap:6px;background:var(--sunk);border:1px solid var(--line);border-radius:999px;padding:6px 12px;cursor:pointer;font-size:13px;color:var(--ink)}
.theme:hover{border-color:var(--accent)}
.theme .moon{display:none}.theme[data-mode="dark"] .moon{display:inline}.theme[data-mode="dark"] .sun{display:none}

/* ---------- page frame ---------- */
.crumbs{font-size:13px;color:var(--muted);padding-block:18px 0}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.crumbs li+li::before{content:"›";margin-right:6px;opacity:.6}
.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--accent)}
.main{display:grid;grid-template-columns:minmax(0,1fr);gap:28px;padding-block:10px 56px}
@media (min-width:900px){.main{grid-template-columns:230px minmax(0,1fr)}.rail{order:-1;position:sticky;top:78px;align-self:start;max-height:calc(100vh - 96px);overflow:auto}}
.content{min-width:0;display:flex;flex-direction:column;gap:22px}
h1{font-family:var(--f-display);font-weight:700;font-size:clamp(30px,4.4vw,42px);line-height:1.08;letter-spacing:-.02em;margin:0;text-wrap:balance}
.lede{margin:-10px 0 0;color:var(--muted);font-size:17px;max-width:62ch}

/* rail */
.rail{display:flex;flex-direction:column;gap:16px;min-width:0}
.rail>p{margin:0;font-family:var(--f-display);font-weight:700;font-size:17px}
.group h3{margin:0 0 4px;font-size:11px;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);font-weight:600}
.group ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:1px}
.group a{display:block;padding:6px 10px;border-radius:8px;text-decoration:none;color:var(--ink);font-size:14px}
.group a:hover{background:var(--sunk)}
.group a[aria-current="page"]{background:var(--accent);color:var(--accent-ink)}
@media (max-width:899px){.rail{border-top:1px solid var(--line);padding-top:22px}.group ul{flex-direction:row;flex-wrap:wrap;gap:6px}.group a{border:1px solid var(--line);background:var(--surface)}}

/* ---------- calculator panel ---------- */
.panel{background:var(--surface);border:1px solid var(--line);border-radius:14px;min-width:0}
.panel-body{padding:20px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,300px);gap:22px;font-size:15px}
@media (max-width:1040px){.panel-body{grid-template-columns:minmax(0,1fr)}}
.loading{grid-column:1/-1;color:var(--muted);margin:0}
.inputs{display:flex;flex-direction:column;gap:14px;min-width:0}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px}
.field{display:flex;flex-direction:column;gap:5px;min-width:0}
.field label{font-size:12px;font-weight:600;color:var(--muted);letter-spacing:.02em;min-height:1em}
.field input,.field select{width:100%;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:9px 10px;font-variant-numeric:tabular-nums}
.field input:focus,.field select:focus{border-color:var(--accent);outline:none;box-shadow:0 0 0 3px var(--accent-soft)}
.unit{position:relative}.unit input{padding-right:46px}
.unit span{position:absolute;right:10px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:13px;pointer-events:none}
.seg{display:inline-flex;background:var(--sunk);border-radius:9px;padding:3px;gap:2px;flex-wrap:wrap}
.seg button{border:0;background:none;padding:6px 12px;border-radius:7px;cursor:pointer;font-size:13px;color:var(--muted)}
.seg button[aria-pressed="true"]{background:var(--surface);color:var(--ink);box-shadow:0 1px 2px var(--shadow)}
.hint{font-size:13px;color:var(--muted);margin:0}
.result{background:var(--sunk);border-radius:12px;padding:18px;display:flex;flex-direction:column;gap:14px;align-self:start;min-width:0}
.result .label{font-size:11px;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);font-weight:600}
.big{font-family:var(--f-num);font-size:clamp(28px,4vw,38px);line-height:1.1;font-variant-numeric:tabular-nums;word-break:break-word}
.big em{font-style:normal;background:linear-gradient(transparent 62%,color-mix(in srgb,var(--mark) 55%,transparent) 62%)}
.kv{display:flex;flex-direction:column;margin:0}
.kv div{display:flex;justify-content:space-between;gap:12px;padding:7px 0;border-top:1px solid var(--line);font-size:14px}
.kv dt{color:var(--muted)}.kv dd{margin:0;font-family:var(--f-num);font-variant-numeric:tabular-nums;text-align:right}
.copy{align-self:start;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:6px 10px;font-size:13px;cursor:pointer}
.copy:hover{border-color:var(--accent)}
.tc-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px}
.tc-wrap table{border-collapse:collapse;width:100%;min-width:520px;font-variant-numeric:tabular-nums}
.tc-wrap th,.tc-wrap td{padding:6px 8px;text-align:left;border-bottom:1px solid var(--line);font-size:14px}
.tc-wrap th{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:600;background:var(--sunk)}
.tc-wrap tr:last-child td{border-bottom:0}
.tc-wrap td input{width:100%;min-width:92px;background:transparent;border:1px solid transparent;border-radius:6px;padding:5px 6px}
.tc-wrap td input:hover{border-color:var(--line)}.tc-wrap td input:focus{border-color:var(--accent);outline:none;background:var(--surface)}
td.num{font-family:var(--f-num);text-align:right;white-space:nowrap}
.day{font-weight:600}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.btn{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:7px 12px;cursor:pointer;font-size:13px}
.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.times{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:8px}
.time-chip{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px;text-align:center}
.time-chip b{display:block;font-family:var(--f-num);font-size:18px}
.time-chip small{color:var(--muted);font-size:12px}
.time-chip.best{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.bars{display:flex;flex-direction:column;gap:6px}
.barrow{display:grid;grid-template-columns:42px minmax(0,1fr) 96px;gap:8px;align-items:center;font-size:12px;font-family:var(--f-num)}
.barrow .track{height:10px;background:var(--surface);border-radius:5px;overflow:hidden;display:flex}
.barrow .p{background:var(--accent)}.barrow .i{background:var(--mark)}
.legend{display:flex;gap:14px;font-size:12px;color:var(--muted)}
.legend i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:5px;vertical-align:-1px}
@media (prefers-reduced-motion:no-preference){.panel-body>.inputs,.panel-body>.result{animation:in .18s ease-out}@keyframes in{from{opacity:.5;transform:translateY(3px)}to{opacity:1;transform:none}}}

/* ---------- article ---------- */
.prose{max-width:70ch;display:flex;flex-direction:column;gap:12px}
.prose h2{font-family:var(--f-display);font-weight:700;font-size:25px;line-height:1.2;letter-spacing:-.01em;margin:22px 0 2px;text-wrap:balance}
.prose h3{font-size:17px;margin:10px 0 0}
.prose p,.prose ul,.prose ol{margin:0}
.prose li{margin:4px 0}
.prose ol,.prose ul{padding-left:22px}
.formula{font-family:var(--f-num);font-size:14px;background:var(--sunk);border-radius:10px;padding:14px 16px;margin:0;white-space:pre-wrap;line-height:1.7;overflow-x:auto}
.tbl{overflow-x:auto;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
.tbl table{border-collapse:collapse;width:100%;font-size:14px;font-variant-numeric:tabular-nums}
.tbl th,.tbl td{padding:8px 12px;text-align:left;border-bottom:1px solid var(--line)}
.tbl th{background:var(--sunk);font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.tbl tr:last-child td{border-bottom:0}
.note{background:var(--accent-soft);border-radius:10px;padding:12px 14px;font-size:15px}
.faq{display:flex;flex-direction:column;border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;padding:13px 28px 13px 0;font-weight:600;list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:10px;font-family:var(--f-num);font-size:20px;color:var(--muted)}
.faq details[open] summary::after{content:"−"}
.faq details p{margin:0 0 14px;color:var(--ink)}
.updated{font-size:13px;color:var(--muted);margin:0}
.related h2{font-family:var(--f-display);font-size:22px;margin:8px 0 12px}

/* ---------- cards / home ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px;text-decoration:none;color:var(--ink);display:flex;flex-direction:column;gap:3px;transition:border-color .12s}
.card:hover{border-color:var(--accent)}
.card b{font-family:var(--f-display);font-size:18px;font-weight:500;letter-spacing:-.01em}
.card span{color:var(--muted);font-size:14px}
.card small{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);font-weight:600}
.hero{padding-block:44px 26px;display:grid;gap:18px}
.hero h1{font-size:clamp(34px,5.6vw,58px);max-width:17ch}
.hero .lede{margin:0;font-size:18px;max-width:56ch}
.pop{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.pop span{font-size:13px;color:var(--muted);margin-right:4px}
.pop a{background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:6px 13px;text-decoration:none;color:var(--ink);font-size:14px}
.pop a:hover{border-color:var(--accent)}
.home-cats{display:flex;flex-direction:column;gap:30px;padding-block:8px 40px}
.home-cats h2{font-family:var(--f-display);font-size:24px;margin:0 0 12px;letter-spacing:-.01em}
.why{border-top:1px solid var(--line);padding-block:36px 48px;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px}
.why h3{font-family:var(--f-display);font-size:19px;margin:0 0 6px}
.why p{margin:0;color:var(--muted)}
.page{max-width:72ch;padding-block:28px 64px;display:flex;flex-direction:column;gap:14px}
.page h2{font-family:var(--f-display);font-size:23px;margin:18px 0 0}
.page p,.page ul{margin:0}
.copyline{display:inline-flex;gap:8px;align-items:center;flex-wrap:wrap}
.copyline code{font-family:var(--f-num);background:var(--sunk);padding:6px 10px;border-radius:8px;font-size:15px}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);background:var(--surface);color:var(--muted);font-size:14px}
footer .wrap{padding-block:32px;display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}
footer h4{margin:0 0 8px;color:var(--ink);font-size:13px;text-transform:uppercase;letter-spacing:.08em}
footer ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:5px}
footer a{color:var(--muted);text-decoration:none}footer a:hover{color:var(--accent)}
.legal{grid-column:1/-1;border-top:1px solid var(--line);padding-top:16px;font-size:13px}
.tc-wrap table:has(#gbody){min-width:0}
.tc-wrap table:has(#gbody) td input{min-width:48px}
.tc-wrap table:has(#gbody) td:first-child input{min-width:104px}
@media (max-width:480px){.panel-body{padding:14px}}