/* Layout: a UK electricity meter. One big amber "meter readout" panel per tool, plain reading columns around it. */
:root{
  --paper:#eef1ef; --card:#ffffff; --ink:#14212a; --muted:#56646d; --line:#cdd5d3;
  --amber:#c77a00; --amber-glow:#ffb21a; --meter-bg:#17242c; --meter-ink:#ffcf6a; --ok:#2f7d5b;
  --f-display:"Big Shoulders Display","Arial Narrow",Arial,sans-serif;
  --f-body:"Atkinson Hyperlegible","Segoe UI",Roboto,Arial,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,Consolas,monospace;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --paper:#0f171c; --card:#16222a; --ink:#e6ecea; --muted:#9aa9b0; --line:#2a3a43;
  --amber:#ffb21a; --amber-glow:#ffcf6a; --meter-bg:#0a1115; --meter-ink:#ffcf6a; --ok:#5fc495; color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#0f171c; --card:#16222a; --ink:#e6ecea; --muted:#9aa9b0; --line:#2a3a43;
  --amber:#ffb21a; --amber-glow:#ffcf6a; --meter-bg:#0a1115; --meter-ink:#ffcf6a; --ok:#5fc495; color-scheme:dark}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17px/1.6 var(--f-body);
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.wrap{max-width:1080px;margin:0 auto}
a{color:var(--amber);text-underline-offset:3px}
a:focus-visible,button:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid var(--amber-glow);outline-offset:2px}
header.site{display:flex;flex-wrap:wrap;gap:12px 28px;align-items:center;justify-content:space-between;padding-block:18px;border-bottom:1px solid var(--line)}
.logo{font:800 28px/1 var(--f-display);letter-spacing:.02em;text-transform:uppercase;color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:10px}
.logo i{display:inline-block;width:14px;height:22px;background:var(--amber);clip-path:polygon(55% 0,0 58%,45% 58%,30% 100%,100% 38%,55% 38%)}
nav.site{display:flex;flex-wrap:wrap;gap:6px 22px;font-size:15px}
nav.site a{color:var(--ink);text-decoration:none;padding-block:4px;border-bottom:2px solid transparent}
nav.site a[aria-current="page"],nav.site a:hover{border-color:var(--amber)}
.hero{padding-block:44px 22px;display:grid;gap:14px;max-width:760px}
.eyebrow{font:600 13px/1 var(--f-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--amber)}
h1{font:800 clamp(40px,7vw,72px)/.95 var(--f-display);text-transform:uppercase;margin:0;text-wrap:balance;letter-spacing:.005em}
h2{font:800 clamp(28px,4vw,40px)/1 var(--f-display);text-transform:uppercase;margin:0 0 10px;text-wrap:balance}
h3{font:700 19px/1.3 var(--f-body);margin:0 0 6px}
.lede{font-size:19px;color:var(--muted);margin:0;max-width:62ch}
section{padding-block:28px}
.tool{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:22px;align-items:start}
@media (max-width:820px){.tool{grid-template-columns:1fr}}
.panel{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:22px;display:grid;gap:18px;min-width:0}
.field{display:grid;gap:6px}
.field label,.lbl{font:600 13px/1.2 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
select,input[type=number]{font:500 17px/1.2 var(--f-body);color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:11px 12px;width:100%;min-width:0}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width:440px){.row2{grid-template-columns:1fr}}
.check{display:flex;gap:10px;align-items:center;font-size:16px}
.check input{width:20px;height:20px;accent-color:var(--amber)}
.hint{font-size:14px;color:var(--muted);margin:0}
.meter{background:var(--meter-bg);color:var(--meter-ink);border-radius:6px;padding:22px;display:grid;gap:16px;font-family:var(--f-mono);box-shadow:inset 0 0 0 1px #ffffff14, inset 0 0 40px #00000055;min-width:0}
.meter .cap{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:#ffcf6a99}
.readout{font:600 clamp(48px,9vw,78px)/1 var(--f-mono);font-variant-numeric:tabular-nums;color:var(--meter-ink);text-shadow:0 0 18px #ffb21a55;letter-spacing:-.02em}
.readout small{font-size:.38em;letter-spacing:.04em;margin-left:6px;color:#ffcf6aaa}
.grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;background:#ffffff1a;border:1px solid #ffffff1a;border-radius:4px;overflow:hidden}
@media (max-width:520px){.grid4{grid-template-columns:repeat(2,minmax(0,1fr))}}
.grid4 div{background:var(--meter-bg);padding:12px;display:grid;gap:4px}
.grid4 b{font:600 22px/1 var(--f-mono);font-variant-numeric:tabular-nums;color:#fff3d6}
.grid4 span{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:#ffcf6a99}
.meter .foot{font-size:13px;color:#d9e2e6b3;line-height:1.5;font-family:var(--f-body)}
.bars{display:grid;gap:8px;margin-top:6px}
.bar{display:grid;grid-template-columns:minmax(120px,190px) minmax(0,1fr) 74px;gap:12px;align-items:center;font-size:15px}
@media (max-width:520px){.bar{grid-template-columns:minmax(0,1fr) 70px}.bar .track{grid-column:1 / -1;order:3}}
.bar .track{display:block;height:14px;background:var(--line);border-radius:2px;overflow:hidden}
.bar .fill{display:block;height:100%;background:var(--amber);width:0;transition:width .5s ease}
.bar.me .fill{background:var(--ok)}
.bar.me .name{font-weight:700}
.bar .val{font:600 15px/1 var(--f-mono);font-variant-numeric:tabular-nums;text-align:right}
.cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px}
.cols p{margin:0}
.faq{display:grid;gap:10px;max-width:780px}
details{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:14px 18px}
summary{cursor:pointer;font-weight:700}
details p{margin:10px 0 0;color:var(--muted)}
.steps{counter-reset:s;display:grid;gap:12px;margin:0;padding:0;list-style:none}
.steps li{counter-increment:s;display:grid;grid-template-columns:38px minmax(0,1fr);gap:12px;align-items:start;background:var(--card);border:1px solid var(--line);border-radius:6px;padding:14px 16px}
.steps li::before{content:counter(s);font:800 26px/1 var(--f-display);color:var(--amber)}
.steps b{display:block;margin-bottom:2px}
.steps span{color:var(--muted);font-size:16px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{font:600 15px/1 var(--f-body);padding:10px 14px;border-radius:999px;border:1px solid var(--line);background:var(--card);color:var(--ink);cursor:pointer}
.chip[aria-pressed="true"]{background:var(--amber);border-color:var(--amber);color:#14212a}
.note{border-left:3px solid var(--amber);padding:10px 14px;background:var(--card);border-radius:0 6px 6px 0;font-size:15px;color:var(--muted)}
.prose{max-width:720px}
.prose p,.prose li{color:var(--ink)}
table.src{border-collapse:collapse;width:100%;font-size:15px}
.tablewrap{overflow-x:auto}
table.src th,table.src td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:top}
table.src th{font:600 12px/1.2 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
table.src td.n{font-family:var(--f-mono);font-variant-numeric:tabular-nums;white-space:nowrap}
footer.site{border-top:1px solid var(--line);margin-top:30px;padding-block:22px 40px;font-size:14px;color:var(--muted);display:flex;flex-wrap:wrap;gap:8px 22px;justify-content:space-between}
footer.site a{color:var(--muted)}
@media (prefers-reduced-motion:reduce){.bar .fill{transition:none}}
/* --- v2 additions: guides, articles, live strip, compare --- */
.strip{background:var(--meter-bg);color:var(--meter-ink);border-radius:6px;padding:16px 18px;display:flex;flex-wrap:wrap;gap:14px 28px;align-items:center;font-family:var(--f-mono)}
.strip .k{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:#ffcf6a99;display:block}
.strip .v{font:600 26px/1.1 var(--f-mono);font-variant-numeric:tabular-nums;color:#fff3d6}
.strip select{background:#0e181e;color:#fff3d6;border-color:#ffffff33;font-size:15px;padding:8px 10px;width:auto}
.strip .grow{flex:1 1 200px;min-width:0;font-family:var(--f-body);font-size:13px;color:#d9e2e6b3}
article.post{max-width:740px;display:grid;gap:4px}
article.post h2{margin-top:26px}
article.post p,article.post li{font-size:18px;line-height:1.65}
article.post ul,article.post ol{padding-left:1.2em;display:grid;gap:6px}
article.post .tablewrap{margin-block:10px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:18px;display:grid;gap:6px;text-decoration:none;color:var(--ink)}
.card:hover{border-color:var(--amber)}
.card b{font:800 22px/1.05 var(--f-display);text-transform:uppercase}
.card span{color:var(--muted);font-size:15px}
.related{display:grid;gap:10px;max-width:740px}
.related a{font-weight:700}
.cmp{font:500 14px/1.5 var(--f-body);color:#d9e2e6;border-top:1px solid #ffffff1a;padding-top:12px}
.cmp b{color:#fff3d6}
.extras{display:flex;flex-wrap:wrap;gap:10px 22px}
.updated{font:600 12px/1 var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}

.share{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;margin-top:14px}
.share button{font:700 15px/1 var(--f-body);background:var(--amber-glow);color:#17242c;border:0;border-radius:4px;padding:11px 16px;cursor:pointer}
.share button:hover{filter:brightness(1.08)}
.share span{font-size:14px;color:#d9e2e6}

.adv{background:var(--paper);border:1px dashed var(--line);border-radius:6px;padding:12px 16px}
.adv>summary{font:700 15px/1.3 var(--f-body);color:var(--ink);list-style:none;display:flex;align-items:center;gap:10px}
.adv>summary::-webkit-details-marker{display:none}
.adv>summary::before{content:"+";display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;background:var(--card);border:1px solid var(--line);font:700 16px/1 var(--f-mono);color:var(--amber)}
.adv[open]>summary::before{content:"\2212"}
.adv>summary::after{content:"For people who know their figures";font:400 13px/1.3 var(--f-body);color:var(--muted);margin-left:auto;text-align:right}
.advbody{display:grid;gap:16px;margin-top:16px}
@media (max-width:440px){.adv>summary::after{display:none}}