:root{
  --bg:#f5f7fb;--surface:#fff;--surface2:#eef2f9;--text:#0f172a;--muted:#64748b;--border:#e2e8f0;
  --accent:#4f46e5;--accent2:#06b6d4;--accent-text:#fff;--danger:#dc2626;--ok:#059669;
  --c-heat:#f97316;--c-water:#0ea5e9;--c-el:#eab308;--c-oil:#a16207;--c-gas:#8b5cf6;
  --radius:16px;--shadow:0 1px 2px rgba(15,23,42,.06),0 8px 24px -12px rgba(15,23,42,.15);
  --font:ui-sans-serif,system-ui,-apple-system,"Segoe UI Variable","Segoe UI",Roboto,sans-serif;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme=light]){--bg:#0b1020;--surface:#131a2e;--surface2:#1a2340;--text:#e8ecf7;--muted:#94a3b8;--border:#263052;--accent:#818cf8;--accent-text:#0b1020;--shadow:0 8px 24px -12px rgba(0,0,0,.6)}
}
:root[data-theme=dark]{--bg:#0b1020;--surface:#131a2e;--surface2:#1a2340;--text:#e8ecf7;--muted:#94a3b8;--border:#263052;--accent:#818cf8;--accent-text:#0b1020;--shadow:0 8px 24px -12px rgba(0,0,0,.6)}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.55 var(--font);
  background-image:radial-gradient(900px 400px at 10% -10%,color-mix(in srgb,var(--accent) 14%,transparent),transparent),radial-gradient(700px 360px at 100% 0,color-mix(in srgb,var(--accent2) 12%,transparent),transparent);
  background-repeat:no-repeat}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
h1{font-size:clamp(1.6rem,3vw,2.2rem);letter-spacing:-.02em;margin:.4em 0 .6em}
h2{font-size:1.15rem;margin:0 0 .6em;letter-spacing:-.01em}
h3{margin:1.2em 0 .3em}
.wrap{width:min(1200px,100% - 2rem);margin-inline:auto}
main.wrap{padding-block:1.2rem 3rem}
.muted{color:var(--muted)}.center{text-align:center}.num{text-align:right;font-variant-numeric:tabular-nums}
.inline{display:inline}
.hp{position:absolute;left:-9999px}
.topbar{position:sticky;top:0;z-index:20;backdrop-filter:saturate(1.4) blur(14px);background:color-mix(in srgb,var(--surface) 78%,transparent);border-bottom:1px solid var(--border)}
.bar{display:flex;align-items:center;gap:1rem;padding-block:.65rem;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.55rem;font-weight:700;font-size:1.1rem;color:var(--text);letter-spacing:-.02em}
.brand small{color:var(--muted);font-weight:500}
.logo{width:28px;height:28px;border-radius:9px;background:linear-gradient(135deg,var(--accent),var(--accent2));box-shadow:0 4px 14px -4px var(--accent)}
.nav ul,.subnav ul{display:flex;gap:.25rem;list-style:none;margin:0;padding:0;flex-wrap:wrap}
.nav a{display:block;padding:.45rem .85rem;border-radius:999px;color:var(--muted);font-weight:500}
.nav a:hover{background:var(--surface2);text-decoration:none;color:var(--text)}
.nav a.active{background:var(--accent);color:var(--accent-text)}
.subnav{grid-column:1/-1;order:5;width:100%}
.subnav a{display:block;padding:.3rem .75rem;border-radius:8px;font-size:.92rem;color:var(--muted)}
.subnav a.active{color:var(--accent);background:var(--surface2);font-weight:600}
.tools{margin-left:auto;display:flex;align-items:center;gap:.5rem}
.chip{border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:999px;padding:.25rem .7rem;font:inherit;font-size:.85rem;cursor:pointer}
.chip:hover{text-decoration:none;border-color:var(--accent)}
.whoami{color:var(--muted);margin:.2rem 0 0;font-size:.9rem}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;box-shadow:var(--shadow);margin-bottom:1.2rem}
.card.narrow,.narrow{max-width:560px}
.hero{display:grid;grid-template-columns:1.3fr 1fr;gap:1.2rem;align-items:start;margin-top:1rem}
.intro h1{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.prose{line-height:1.7}
.prose pre,pre{background:var(--surface2);padding:.8rem 1rem;border-radius:10px;overflow:auto;font-size:.88rem}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,420px),1fr));gap:1.2rem}
.metric-head{display:flex;flex-wrap:wrap;justify-content:space-between;gap:.4rem;align-items:baseline}
.metric{border-top:4px solid var(--accent)}
.metric[data-kind=heat]{border-top-color:var(--c-heat)}.metric[data-kind=water]{border-top-color:var(--c-water)}
.metric[data-kind=el]{border-top-color:var(--c-el)}.metric[data-kind=oil]{border-top-color:var(--c-oil)}.metric[data-kind=gas]{border-top-color:var(--c-gas)}
form label{display:block;margin:0 0 .85rem;font-weight:500;font-size:.92rem}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=date],input[type=tel],select,input[type=file]{
  display:block;width:100%;margin-top:.3rem;padding:.6rem .75rem;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--text);font:inherit}
input:focus,select:focus,button:focus-visible,a:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 45%,transparent);outline-offset:1px;border-color:var(--accent)}
label.check{display:flex;gap:.5rem;align-items:center}label.check input{width:auto;margin:0}
.btn{display:inline-block;border:0;border-radius:12px;padding:.65rem 1.1rem;font:inherit;font-weight:600;cursor:pointer;color:var(--accent-text);background:linear-gradient(135deg,var(--accent),color-mix(in srgb,var(--accent) 60%,var(--accent2)));box-shadow:0 6px 16px -8px var(--accent)}
.btn:hover{filter:brightness(1.07);text-decoration:none}
.btn.small{padding:.4rem .8rem;font-size:.88rem}
.btn.ghost{background:transparent;color:var(--text);border:1px solid var(--border);box-shadow:none}
.btn.ghost:hover{border-color:var(--accent)}
.btn.block{display:block;width:100%;text-align:left;margin-bottom:.5rem}
.actions{margin-top:1rem}
.filter{display:flex;flex-wrap:wrap;gap:.8rem;align-items:end;margin-bottom:1rem}.filter label{margin:0}.filter input,.filter select{width:auto}
.tabs{display:flex;gap:.3rem;margin-bottom:1rem;flex-wrap:wrap}
.tabs a{padding:.4rem .9rem;border-radius:999px;border:1px solid var(--border);color:var(--muted)}
.tabs a.active{background:var(--accent);border-color:var(--accent);color:var(--accent-text)}
.alert{padding:.8rem 1rem;border-radius:12px;margin:1rem 0;border:1px solid}
.alert.ok{background:color-mix(in srgb,var(--ok) 12%,var(--surface));border-color:var(--ok)}
.alert.err{background:color-mix(in srgb,var(--danger) 12%,var(--surface));border-color:var(--danger)}
.table-wrap{overflow-x:auto;margin-inline:-.25rem;padding-inline:.25rem}
table.data{width:100%;border-collapse:collapse;font-size:.92rem}
table.data th{position:sticky;top:0;text-align:left;color:var(--muted);font-weight:600;font-size:.8rem;text-transform:uppercase;letter-spacing:.04em;padding:.5rem .4rem;border-bottom:1px solid var(--border);white-space:nowrap}
table.data td{padding:.3rem .4rem;border-bottom:1px solid var(--border)}
table.data tbody tr:hover{background:var(--surface2)}
table.data tfoot td{font-weight:700;border-bottom:0}
table.data input,table.data select{margin:0;padding:.35rem .45rem;min-width:0;border-radius:8px}
.in-date{width:7.5rem}.in-time{width:4.5rem}.in-num{width:6rem}.in-note{min-width:9rem}
tr.new td{background:color-mix(in srgb,var(--accent) 6%,transparent)}
.kv{display:grid;grid-template-columns:auto 1fr;gap:.4rem 1.2rem}.kv dt{color:var(--muted)}.kv dd{margin:0}
.foot{display:flex;gap:1.2rem;flex-wrap:wrap;color:var(--muted);font-size:.88rem;padding-block:1.5rem;border-top:1px solid var(--border)}

/* Printable meter-reading sheet */
.reading-sheet{width:100%;border-collapse:collapse;table-layout:fixed;background:#fff;color:#111}
.reading-sheet th,.reading-sheet td{border:1px solid #111;padding:3px 5px}
.reading-sheet th{font-size:.75rem;line-height:1.2;text-align:center;vertical-align:middle;white-space:normal;overflow-wrap:anywhere}
.reading-sheet td{height:28px}
.reading-sheet .sheet-title-row th{border-top:0;border-left:0;border-right:0;text-align:left}
.reading-sheet .sheet-title-row h1{font-size:1rem;margin:.3rem 0}
.reading-sheet .sheet-title-row .sheet-orientation{text-align:right}
.reading-sheet .sheet-groups th{background:#eef2f9}
.sheet-footer{font-size:.8rem;margin:.4rem 0}
.reading-sheet-actions{margin:1rem 0}

/* Charts */
figure.chart{margin:1rem 0;position:relative}
figure.chart figcaption{color:var(--muted);font-size:.85rem;margin-bottom:.3rem}
.chart svg{display:block;width:100%;height:auto;overflow:visible}
.chart .grid-line{stroke:var(--border);stroke-width:1}
.chart .axis-text{fill:var(--muted);font-size:11px;font-family:var(--font)}
.chart .line{fill:none;stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round}
.chart .bar{transition:opacity .15s}
.chart .dot{stroke:var(--surface);stroke-width:2}
.chart .cursor{stroke:var(--muted);stroke-dasharray:3 3;stroke-width:1}
.chart-tip{position:absolute;pointer-events:none;background:var(--text);color:var(--bg);padding:.35rem .6rem;border-radius:8px;font-size:.8rem;white-space:nowrap;transform:translate(-50%,-110%);opacity:0;transition:opacity .12s;z-index:5}
.chart-tip.on{opacity:1}
@keyframes draw{to{stroke-dashoffset:0}}
@keyframes rise{from{opacity:0}to{opacity:1}}
.chart .line.anim{animation:draw 1s ease-out forwards}
.chart .area.anim,.chart .bar.anim{animation:rise .8s ease-out both}
@media (prefers-reduced-motion:reduce){.chart .line.anim,.chart .area.anim,.chart .bar.anim{animation:none}}

@media (max-width:860px){.hero{grid-template-columns:1fr}.tools{margin-left:0}}
@media print{
  @page{size:A4 landscape;margin:5mm}
  .topbar,.foot,.noprint,.tools{display:none!important}
  html,body,main.reading-sheet-wrap{background:#fff!important;color:#000!important;width:100%!important;max-width:none!important;margin:0!important;padding:0!important}
  .table-wrap{overflow:visible!important;margin:0!important;padding:0!important}
  .reading-sheet{width:100%!important;min-width:0!important;font-size:7pt;page-break-inside:avoid;break-inside:avoid}
  .reading-sheet th,.reading-sheet td{border:1px solid #000!important;background:#fff!important;color:#000!important}
  .reading-sheet th{font-size:7pt;padding:2px 3px}
  .reading-sheet td{height:5mm;padding:1px 3px}
  .reading-sheet thead{display:table-header-group}
  .reading-sheet tr{page-break-inside:avoid;break-inside:avoid}
  .reading-sheet .sheet-title-row th{border-top:0!important;border-left:0!important;border-right:0!important}
  .reading-sheet .sheet-title-row h1{font-size:12pt}
  .sheet-footer{font-size:7pt;margin:2mm 0 0}
}