/* KJ to Cal — site styles. Units are colour-coded everywhere: kJ = cobalt, kcal = orange. */
@font-face{font-family:"Archivo";src:url("../fonts/archivo-var.woff2") format("woff2");font-weight:100 900;font-stretch:62% 125%;font-style:normal;font-display:swap}
:root{
  --paper:#F5F7FA;--card:#fff;--ink:#0E1726;--ink2:#38455A;--muted:#5A6678;--line:#D8DEE8;--line2:#E8ECF2;
  --kj:#2447D6;--kj-soft:#E8EDFC;--kcal:#C2410C;--kcal-fill:#EA580C;--kcal-soft:#FDEEE4;--cal:#7A3FB0;--j:#41576F;--ok:#0F7B5F;--bad:#B42318;
  --r:10px;--wrap:1120px;--read:68ch;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:16px}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17px/1.62 "Archivo",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-stretch:100%;text-rendering:optimizeLegibility}
img{max-width:100%;height:auto}
a{color:var(--kj);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid #7C9CFF;outline-offset:2px;border-radius:4px}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 20px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:#fff;padding:8px 14px;border-radius:6px;z-index:99}
.skip:focus{left:8px}

/* header */
.site-header{background:var(--card);border-bottom:1px solid var(--line)}
.header-in{display:flex;align-items:center;gap:28px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);flex:none}
.brand-name{font-weight:800;font-stretch:112%;font-size:1.2rem;letter-spacing:-.01em}
.main-nav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;margin-left:auto}
.main-nav::-webkit-scrollbar{display:none}
.main-nav a{white-space:nowrap;text-decoration:none;color:var(--ink2);font-weight:550;font-size:.95rem;padding:9px 12px;border-radius:8px}
.main-nav a:hover{background:var(--paper);color:var(--ink)}
.main-nav a[aria-current=page]{color:var(--kj);background:var(--kj-soft)}
@media (max-width:760px){.header-in{flex-wrap:wrap;gap:0;padding-top:10px}.main-nav{margin:0 -20px;padding:2px 20px 8px;width:calc(100% + 40px)}}

/* hero */
.hero{padding:34px 0 8px}
.hero h1{margin:0 0 10px;font-size:clamp(1.9rem,4.2vw,2.9rem);line-height:1.1;font-weight:800;font-stretch:108%;letter-spacing:-.025em;max-width:30ch;text-wrap:balance}
.lede{margin:0 0 22px;font-size:1.15rem;color:var(--ink2);max-width:62ch}
.hero-tool{padding-bottom:16px}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:4px 8px;margin:0 0 14px;padding:0;font-size:.88rem;color:var(--muted)}
.crumbs li+li::before{content:"/";margin-right:8px;color:var(--line)}
.crumbs a{color:var(--muted)}

/* converter */
.cv{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px;box-shadow:0 1px 0 var(--line2)}
.cv-grid{display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:start}
.cv-label{display:block;font-size:.85rem;font-weight:650;color:var(--muted);margin-bottom:6px}
.cv-input{width:100%;font:inherit;font-size:clamp(2rem,5vw,3rem);font-weight:750;font-stretch:118%;font-variant-numeric:tabular-nums;letter-spacing:-.02em;color:var(--ink);background:#fff;border:2px solid var(--line);border-radius:var(--r);padding:8px 14px;line-height:1.2}
.cv-input:focus{border-color:var(--kj);outline:none;box-shadow:0 0 0 4px var(--kj-soft)}
.cv-input[aria-invalid=true]{border-color:var(--bad)}
.cv-result{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 10px;min-height:calc(2px*2 + 1.2*clamp(2rem,5vw,3rem) + 16px);padding:8px 14px;background:var(--paper);border:2px solid transparent;border-radius:var(--r);overflow-wrap:anywhere}
.cv-num{font-size:clamp(2rem,5vw,3rem);font-weight:800;font-stretch:118%;font-variant-numeric:tabular-nums;letter-spacing:-.02em;line-height:1.2}
.cv-unit{font-size:1.25rem;font-weight:750;font-stretch:112%}
.cv-select{margin-top:10px;position:relative}
.cv-select select,.f select{width:100%;appearance:none;font:inherit;font-weight:650;color:var(--ink);background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none' stroke='%2338455A' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='m1 1 5 5 5-5'/%3E%3C/svg%3E") no-repeat right 14px center;border:2px solid var(--line);border-radius:var(--r);padding:11px 38px 11px 14px;cursor:pointer}
.cv-select select:focus,.f select:focus{border-color:var(--kj);outline:none}
.cv-select select.u-kj,.cv-select select.u-kcal{border-left-width:6px}
.u-kj{color:var(--kj)}.u-kcal{color:var(--kcal)}.u-cal{color:var(--cal)}.u-j{color:var(--j)}
.cv-select select.u-kj{border-left-color:var(--kj)}.cv-select select.u-kcal{border-left-color:var(--kcal-fill)}.cv-select select.u-cal{border-left-color:var(--cal)}.cv-select select.u-j{border-left-color:var(--j)}
.cv-swap{margin-top:30px;width:48px;height:48px;border-radius:50%;border:2px solid var(--line);background:#fff;color:var(--ink2);cursor:pointer;display:grid;place-items:center;transition:transform .25s ease,border-color .15s,color .15s}
.cv-swap:hover{border-color:var(--kj);color:var(--kj)}
.cv-swap.spin{transform:rotate(180deg)}
.cv-error{margin:12px 0 0;color:var(--bad);font-weight:600}
.cv-info{margin-top:16px;padding-top:14px;border-top:1px solid var(--line2);display:flex;flex-wrap:wrap;gap:6px 24px;align-items:baseline}
.cv-eq{margin:0;font-weight:700;font-size:1.1rem;font-variant-numeric:tabular-nums}
.cv-formula{margin:0;color:var(--muted);font-size:.95rem}
.cv-formula span{font-weight:650;margin-right:6px}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.92em;background:var(--paper);border:1px solid var(--line2);border-radius:5px;padding:1px 6px}
.cv-presets{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:14px}
.cv-presets span{font-size:.85rem;font-weight:650;color:var(--muted);margin-right:2px}
.cv-presets button{font:inherit;font-size:.92rem;font-weight:600;font-variant-numeric:tabular-nums;color:var(--ink2);background:var(--paper);border:1px solid var(--line);border-radius:999px;padding:5px 14px;cursor:pointer}
.cv-presets button:hover{border-color:var(--kj);color:var(--kj)}
.cv-presets .cv-copy{margin-left:auto;background:var(--ink);color:#fff;border-color:var(--ink)}
.cv-presets .cv-copy:hover{background:var(--kj);border-color:var(--kj);color:#fff}
.cv-detail{display:grid;grid-template-columns:1.2fr 1fr;gap:28px;margin-top:20px;padding-top:18px;border-top:1px solid var(--line2)}
.cv-detail h3{font-size:.95rem;margin:0 0 10px;font-weight:700}
.cv-all dl{margin:0}
.cv-all dl>div{display:flex;justify-content:space-between;gap:12px;padding:8px 0;border-bottom:1px solid var(--line2)}
.cv-all dl>div:last-child{border-bottom:0}
.cv-all dt{font-weight:650}.cv-all dd{margin:0;font-weight:700;font-variant-numeric:tabular-nums;text-align:right;overflow-wrap:anywhere}
.bar{height:12px;background:var(--line2);border-radius:99px;overflow:hidden}
.bar span{display:block;height:100%;background:linear-gradient(90deg,var(--kj),var(--kcal-fill));border-radius:99px;transition:width .35s ease}
.cv-meter p{margin:10px 0 0;font-size:.92rem;color:var(--ink2)}
@media (max-width:720px){
  .cv{padding:16px}.cv-grid{grid-template-columns:1fr}.cv-swap{margin:-4px auto;transform:rotate(90deg)}.cv-swap.spin{transform:rotate(270deg)}
  .cv-detail{grid-template-columns:1fr;gap:20px}.cv-presets .cv-copy{margin-left:0}
}

/* layout / prose */
.layout{display:block;padding-top:28px;padding-bottom:56px}
.layout.has-toc{display:grid;grid-template-columns:minmax(0,var(--read)) 240px;gap:56px;justify-content:start}
.layout.has-toc .toc{order:2}
.prose{max-width:var(--read);min-width:0}
.prose h2{font-size:1.55rem;line-height:1.2;font-weight:750;font-stretch:104%;letter-spacing:-.015em;margin:2.1em 0 .55em}
.prose h3{font-size:1.15rem;margin:1.6em 0 .4em}
.prose p,.prose li{max-width:var(--read)}
.prose ul,.prose ol{padding-left:1.3em}
.prose li{margin:.3em 0}
.prose>h2:first-child{margin-top:0}
.byline{color:var(--muted);font-size:.92rem;margin:0 0 18px}
.updated{color:var(--muted);font-size:.88rem;margin-top:36px;padding-top:14px;border-top:1px solid var(--line)}
.table-wrap{overflow-x:auto;margin:1.2em 0;border:1px solid var(--line);border-radius:var(--r);background:var(--card)}
table{border-collapse:collapse;width:100%;font-size:.96rem;font-variant-numeric:tabular-nums}
th,td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line2);vertical-align:top}
thead th{background:var(--paper);font-weight:700;font-size:.85rem;color:var(--ink2);border-bottom:1px solid var(--line);white-space:nowrap}
tbody tr:last-child th,tbody tr:last-child td{border-bottom:0}
tbody th{font-weight:650}
tr.cur th,tr.cur td{background:var(--kj-soft);font-weight:700}
.admonition{border:1px solid var(--line);border-left:6px solid var(--kj);background:var(--card);border-radius:var(--r);padding:14px 18px;margin:0 0 1.6em}
.admonition p{margin:.3em 0}
.admonition-title{font-weight:750;font-size:.95rem;color:var(--kj)}
.admonition.answer{border-left-color:var(--kcal-fill)}
.admonition.answer .admonition-title{color:var(--kcal)}
.toc{position:sticky;top:20px;align-self:start;font-size:.92rem;border-left:2px solid var(--line);padding-left:16px}
.toc h2{font-size:.9rem;margin:0 0 8px;font-weight:700}
.toc ol{list-style:none;margin:0;padding:0}.toc li{margin:6px 0}.toc a{color:var(--ink2);text-decoration:none}.toc a:hover{color:var(--kj);text-decoration:underline}
@media (max-width:980px){.layout.has-toc{display:block}.toc{position:static;margin:0 0 24px;border:1px solid var(--line);border-radius:var(--r);padding:14px 18px;background:var(--card)}}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 8px}
.chips a{font-size:.9rem;font-weight:600;text-decoration:none;color:var(--ink2);background:var(--card);border:1px solid var(--line);border-radius:999px;padding:5px 14px}
.chips a:hover{border-color:var(--kj);color:var(--kj)}
.chart{scroll-margin-top:16px}

/* faq */
.faq{margin-top:2.4em}
.faq h2{margin-top:0}
.faq details{border-bottom:1px solid var(--line)}
.faq details:first-of-type{border-top:1px solid var(--line)}
.faq summary{cursor:pointer;font-weight:650;padding:14px 32px 14px 0;list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:6px;top:50%;width:9px;height:9px;border-right:2px solid var(--ink2);border-bottom:2px solid var(--ink2);transform:translateY(-70%) rotate(45deg);transition:transform .2s}
.faq details[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
.faq-a{padding:0 0 14px}.faq-a p{margin:.3em 0}

/* related, hubs */
.related{margin-top:2.4em}
.related h2{margin-top:0}
.related ul,.hub-rows{list-style:none;padding:0;margin:0;border-top:1px solid var(--line)}
.related li,.hub-rows li{margin:0;border-bottom:1px solid var(--line)}
.related a,.hub-rows a{display:block;padding:12px 4px;text-decoration:none;color:var(--ink)}
.related a:hover,.hub-rows a:hover{background:var(--card)}
.related strong,.hub-rows strong{display:block;color:var(--kj)}
.related span,.hub-rows span{display:block;font-size:.92rem;color:var(--muted);margin-top:2px}
.hub-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:0;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.hub-list li{margin:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--card)}
.hub-list a{display:block;padding:12px 14px;text-decoration:none;color:var(--ink);font-variant-numeric:tabular-nums}
.hub-list a:hover{background:var(--kj-soft)}
.hub-list strong{color:var(--kj)}.hub-list span{color:var(--kcal);font-weight:650}

/* forms */
.form{max-width:560px;margin:1.4em 0}
.f{margin:0 0 16px}
.f label{display:block;font-weight:650;font-size:.92rem;margin-bottom:6px}
.f input,.f textarea{width:100%;font:inherit;padding:11px 14px;border:2px solid var(--line);border-radius:var(--r);background:#fff;color:var(--ink)}
.f input:focus,.f textarea:focus{border-color:var(--kj);outline:none}
.hp{position:absolute;left:-9999px;height:0;overflow:hidden}
.btn{display:inline-block;font:inherit;font-weight:700;color:#fff;background:var(--kj);border:0;border-radius:var(--r);padding:12px 22px;cursor:pointer;text-decoration:none}
.btn:hover{background:#1B37AE}
.notice{border-radius:var(--r);padding:12px 16px;margin:0 0 18px;border:1px solid}
.notice.ok{background:#E7F6F0;border-color:#9BD4C0;color:#0B5A45}
.notice.bad{background:#FDEDEB;border-color:#F0B7B1;color:#8A1C12}
.notice ul{margin:6px 0 0;padding-left:1.2em}

/* calculator */
.calc{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px}
.calc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:4px 18px}
.calc .f-wide{grid-column:1/-1}
.calc .f input,.calc .f select{max-width:100%}
.seg{border:0;padding:0;margin:0 0 16px;min-width:0}
.seg legend{font-weight:650;font-size:.92rem;margin-bottom:6px;padding:0}
.seg label{display:inline-flex;align-items:center;gap:6px;margin-right:16px;font-size:.95rem;cursor:pointer}
.calc-out{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:8px;padding-top:18px;border-top:1px solid var(--line2)}
.calc-out>div{background:var(--paper);border-radius:var(--r);padding:14px 16px}
.calc-out strong{font-size:2rem;font-weight:800;font-stretch:118%;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.calc-out em{display:block;font-style:normal;color:var(--kcal);font-weight:650;margin-top:2px}
.calc-main{background:var(--kj-soft)!important}
.calc-note{margin:12px 0 0;color:var(--muted);font-size:.88rem}
@media (max-width:720px){.calc-grid{grid-template-columns:1fr 1fr}.calc-out{grid-template-columns:1fr}}

/* footer */
.site-footer{background:var(--ink);color:#C9D2E0;padding:44px 0 28px;margin-top:20px}
.foot-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.foot-h{font-size:.9rem;color:#fff;margin:0 0 10px;font-weight:700}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:6px 0}
.site-footer a{color:#C9D2E0;text-decoration:none;font-size:.94rem}
.site-footer a:hover{color:#fff;text-decoration:underline}
.foot-base{margin-top:32px;padding-top:18px;border-top:1px solid #26334A;font-size:.85rem;color:#93A0B5}
.foot-base p{margin:4px 0}
@media (max-width:760px){.foot-grid{grid-template-columns:1fr 1fr}}

@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{
  .site-header,.site-footer,.cv,.calc,.chips,.toc,.related,.faq,.crumbs,.skip{display:none!important}
  body{background:#fff;font-size:11pt}.hero{padding:0}.layout{padding:0}
  .table-wrap{border:0;overflow:visible}th,td{padding:4px 8px}a{color:#000;text-decoration:none}
  .chart{break-inside:avoid}
}