:root {
  color-scheme: light;
  --bg: linear-gradient(160deg, #eef4fb 0%, #e6eef8 45%, #eaf5f3 100%);
  --glow-1: rgba(42, 120, 214, 0.16); --glow-2: rgba(27, 175, 122, 0.12);
  --surface: rgba(255, 255, 255, 0.72); --surface-2: rgba(255, 255, 255, 0.9);
  --ink: #0b0b0b; --ink-2: #52514e; --muted: #7a7973;
  --grid: #e1e0d9; --axis: #c3c2b7; --border: rgba(11, 11, 11, 0.08);
  --series: #2a78d6; --series-fill: rgba(42, 120, 214, 0.14);
  --good: #0ca30c; --warning: #fab219; --critical: #d03b3b;
  --btn: rgba(11, 11, 11, 0.05); --btn-hover: rgba(11, 11, 11, 0.1);
  --accent: #2a78d6; --accent-ink: #ffffff; --solid: #ffffff;
  --c1: #2a78d6; --c2: #eb6834; --c3: #1baf7a; --c4: #eda100;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 8px 24px rgba(16, 24, 40, 0.06);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: linear-gradient(160deg, #1b2a40 0%, #22344d 50%, #1a3538 100%);
    --glow-1: rgba(57, 135, 229, 0.30); --glow-2: rgba(25, 158, 112, 0.20);
    --surface: rgba(255, 255, 255, 0.06); --surface-2: rgba(255, 255, 255, 0.09);
    --ink: #ffffff; --ink-2: #cfd5dd; --muted: #9daab9;
    --grid: rgba(255, 255, 255, 0.08); --axis: rgba(255, 255, 255, 0.18); --border: rgba(255, 255, 255, 0.11);
    --series: #3987e5; --series-fill: rgba(57, 135, 229, 0.18);
    --btn: rgba(255, 255, 255, 0.06); --btn-hover: rgba(255, 255, 255, 0.12);
    --accent: #3987e5; --solid: #22344d;
    --c1: #3987e5; --c2: #d95926; --c3: #199e70; --c4: #c98500;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.25);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: linear-gradient(160deg, #1b2a40 0%, #22344d 50%, #1a3538 100%);
  --glow-1: rgba(57, 135, 229, 0.30); --glow-2: rgba(25, 158, 112, 0.20);
  --surface: rgba(255, 255, 255, 0.06); --surface-2: rgba(255, 255, 255, 0.09);
  --ink: #ffffff; --ink-2: #cfd5dd; --muted: #9daab9;
  --grid: rgba(255, 255, 255, 0.08); --axis: rgba(255, 255, 255, 0.18); --border: rgba(255, 255, 255, 0.11);
  --series: #3987e5; --series-fill: rgba(57, 135, 229, 0.18);
  --btn: rgba(255, 255, 255, 0.06); --btn-hover: rgba(255, 255, 255, 0.12);
  --accent: #3987e5; --solid: #22344d;
  --c1: #3987e5; --c2: #d95926; --c3: #199e70; --c4: #c98500;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.25);
}

:root[data-theme="navy"] {
  color-scheme: dark;
  --bg: linear-gradient(170deg, #04070d 0%, #0a1526 55%, #122240 100%);
  --glow-1: rgba(255, 255, 255, 0.07); --glow-2: rgba(57, 135, 229, 0.20);
  --surface: rgba(255, 255, 255, 0.05); --surface-2: rgba(255, 255, 255, 0.085);
  --ink: #ffffff; --ink-2: #d5dbe4; --muted: #96a1b2;
  --grid: rgba(255, 255, 255, 0.08); --axis: rgba(255, 255, 255, 0.18); --border: rgba(255, 255, 255, 0.12);
  --series: #4d95ec; --series-fill: rgba(77, 149, 236, 0.18);
  --btn: rgba(255, 255, 255, 0.07); --btn-hover: rgba(255, 255, 255, 0.13);
  --accent: #3987e5; --solid: #0a1526;
  --c1: #4d95ec; --c2: #e0683a; --c3: #22a877; --c4: #d19000;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; padding: 20px 24px 40px; color: var(--ink);
  font: 14px/1.45 "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: radial-gradient(900px 500px at 10% -10%, var(--glow-1), transparent 70%),
              radial-gradient(800px 500px at 100% 0%, var(--glow-2), transparent 70%), var(--bg);
  background-attachment: fixed;
}
@media (max-width: 600px) { body { padding: 16px; } }

/* top bar */
header { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; margin-bottom: 16px; }
.brand { display: flex; align-items: center; gap: 14px; margin-right: auto; }
.brand img { width: 96px; height: 40px; object-fit: cover; border-radius: 10px; }
.brand h1 { font-size: 22px; font-weight: 600; margin: 0; letter-spacing: -0.01em; }
.brand .sub { color: var(--muted); font-size: 12px; }
.brand .sub .pill { padding: 0; border: 0; background: none; font-size: 12px; color: var(--muted); gap: 5px; }
header .spacer { flex: 1; }
header .actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
a.button.quiet, button.quiet { background: transparent; border-color: transparent; color: var(--ink-2); }
a.button.quiet:hover, button.quiet:hover:not(:disabled) { background: var(--btn); color: var(--ink); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.pill { display: inline-flex; align-items: center; gap: 7px; padding: 5px 12px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface); font-size: 13px; color: var(--ink-2);
  }
.pill.link { cursor: pointer; }
.pill.link:hover { background: var(--btn-hover); color: var(--ink); }
.pill::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.pill.good::before { background: var(--good); box-shadow: 0 0 0 3px rgba(12, 163, 12, 0.18); }
.pill.warn::before { background: var(--warning); box-shadow: 0 0 0 3px rgba(250, 178, 25, 0.18); }
.pill.bad::before { background: var(--critical); box-shadow: 0 0 0 3px rgba(208, 59, 59, 0.2); }

/* panels */
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 16px 18px;
  box-shadow: var(--shadow); margin-bottom: 16px; }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
h2 { font-size: 13px; font-weight: 600; margin: 0; color: var(--ink-2); text-transform: uppercase; letter-spacing: 0.06em; }
h3 { font-size: 12px; font-weight: 600; margin: 14px 0 8px; color: var(--muted); }
h3:first-child { margin-top: 0; }

#tripbar { position: sticky; top: 0; z-index: 5; }  /* the trip bar and its Reset stay in view while scrolling */
.overlay { position: fixed; inset: 0; background: rgba(0, 0, 0, 0.55); backdrop-filter: blur(3px); z-index: 20; display: flex; align-items: flex-start; justify-content: center; padding: 40px 16px; overflow: auto; }
.modal { background: var(--solid); color: var(--ink); border: 1px solid var(--border); border-radius: 16px; padding: 18px 20px; width: min(1180px, 100%); box-shadow: var(--shadow); }
.fgrid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px 22px; }
.frow { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 3px 0; font-size: 13px; }
.frow span { color: var(--ink-2); }
.frow small { color: var(--muted); }
.frow input, .frow select { width: 130px; }
.frow select { padding: 6px 4px; }
.details { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px 22px; }
.drow { display: flex; justify-content: space-between; gap: 8px; padding: 3px 0; border-bottom: 1px solid var(--border); font-size: 13px; }
.drow span { color: var(--ink-2); }
.drow small { color: var(--muted); }
.drow b { font-weight: 600; font-variant-numeric: tabular-nums; text-align: right; }
.drow input, .drow select { width: 130px; }
.strip { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; padding: 10px 16px; margin-bottom: 12px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px; }
.strip .big { font-size: 18px; font-weight: 600; display: flex; align-items: baseline; gap: 10px; }
.strip .kv { display: flex; flex-direction: column; font-size: 12px; color: var(--muted); }
.strip .kv b { font-size: 17px; color: var(--ink); font-variant-numeric: tabular-nums; }
.program { margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border); }
.program input { width: 62px; }
.marker { stroke: var(--muted); stroke-dasharray: 3 3; opacity: 0.8; }  /* grey: no series uses it */
.marker.near { stroke: var(--ink); stroke-width: 2; stroke-dasharray: none; opacity: 1; }
.tip .ev { flex-basis: 100%; color: var(--ink); }
.tip .ev time { color: var(--muted); margin-right: 8px; font-variant-numeric: tabular-nums; }  /* time apart from the text */
.marker.many { stroke-dasharray: none; }
text.count { font-size: 10px; font-weight: 600; fill: var(--ink); paint-order: stroke; stroke: var(--surface); stroke-width: 3px; }
.banner { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding: 12px 16px; margin-bottom: 12px;
  border-radius: 12px; background: var(--solid); border: 1px solid var(--border); box-shadow: var(--shadow);
  border-left: 4px solid var(--critical); }
.banner.warn { border-left-color: var(--warning); }
.banner b { letter-spacing: 0.04em; }

/* tiles */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(200px, 100%), 1fr)); gap: 10px; }
.card { background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; position: relative; }
.card .tag { font-weight: 600; font-size: 13px; display: flex; align-items: center; gap: 8px; }
.card .kind { font-weight: 500; font-size: 11px; color: var(--muted); padding: 1px 7px; border-radius: 999px; border: 1px solid var(--border); }
.card .kind.unknown { border-style: dashed; }
.card .desc { color: var(--muted); font-size: 12px; margin-top: 1px; }
.card .value { font-size: 28px; font-weight: 600; margin-top: 6px; letter-spacing: -0.02em; }
.card .value small { font-size: 13px; font-weight: 400; color: var(--ink-2); margin-left: 3px; }
.card .fault { color: var(--critical); font-size: 12px; }
.card.faulted { border-color: rgba(208, 59, 59, 0.5); }
.mrow { display: flex; justify-content: space-between; align-items: baseline; margin-top: 4px; }
.mrow .k { color: var(--muted); font-size: 12px; }
.mrow .v { font-size: 18px; font-weight: 600; font-variant-numeric: tabular-nums; }
.mrow .v small { font-size: 12px; font-weight: 400; color: var(--ink-2); }
.nw { color: var(--muted); font-size: 12px; font-weight: 400; }
.bad { color: var(--critical); font-size: 13px; }
.panel-head .seg + .seg { margin-left: 8px; }
.spark { display: block; width: 100%; height: 34px; margin-top: 6px; }

/* controls */
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 4px; }
.seg { display: inline-flex; background: var(--btn); border-radius: 10px; padding: 3px; gap: 3px; }
.seg button { border: 0; background: transparent; min-height: 32px; padding: 4px 14px; }

button { font: inherit; padding: 7px 14px; border-radius: 9px; border: 1px solid var(--border);
  background: var(--btn); color: var(--ink); cursor: pointer; min-height: 36px; }
a.button { display: inline-flex; align-items: center; font: inherit; padding: 7px 14px; border-radius: 9px; min-height: 36px;
  border: 1px solid var(--border); background: var(--btn); color: var(--ink); text-decoration: none; }
button:hover:not(:disabled), a.button:hover { background: var(--btn-hover); }
button:disabled { opacity: 0.35; cursor: not-allowed; }
.seg button.on, .seg button.on:hover:not(:disabled) { background: var(--accent); color: var(--accent-ink); cursor: default; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button.primary, button.primary:hover:not(:disabled) { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
button.primary:hover:not(:disabled) { filter: brightness(1.1); }
button.stop { background: var(--critical); color: #fff; border-color: transparent; font-weight: 600; }
button.stop:hover:not(:disabled) { background: #b83232; }
button.stop.armed { outline: 3px solid var(--warning); outline-offset: 2px; }
input, select { font: inherit; padding: 7px 10px; border-radius: 9px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--ink); }
select option { background: var(--solid); color: var(--ink); }  /* the list must not inherit a translucent surface */
input[type=number] { width: 84px; }
.toggle { display: flex; align-items: center; gap: 10px; justify-self: end; }
.toggle span { font-size: 13px; color: var(--muted); min-width: 64px; text-align: right; }
.toggle span.lit { color: var(--ink); font-weight: 600; }
.switch { position: relative; width: 46px; min-height: 0; height: 26px; padding: 0; border-radius: 999px; border: 0;
  background: var(--btn-hover); }
.switch::after { content: ""; position: absolute; top: 3px; left: 3px; width: 20px; height: 20px; border-radius: 50%;
  background: #fff; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3); transition: transform 0.15s; }
.switch.on, .switch.on:hover:not(:disabled) { background: var(--accent); }
.switch.on::after { transform: translateX(20px); }
.switch:disabled { opacity: 0.6; }
.unit { color: var(--muted); font-size: 12px; }
.why { color: var(--muted); font-size: 12px; }
.power .why, .tvrow .why, .swtile .why { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
#msg { min-height: 20px; color: var(--ink-2); font-size: 13px; margin: -6px 0 10px; }

/* layout: power row, one panel per circuit, trends */
.power { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(270px, 100%), 1fr)); gap: 10px; }
.circuits { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(560px, 100%), 1fr)); gap: 16px; align-items: start; }
.circuits > * { min-width: 0; }
.meters { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(150px, 100%), 1fr)); gap: 8px; margin-bottom: 4px; }
.meters .card { padding: 10px 12px; }
.name { font-weight: 600; }
.desc { color: var(--muted); font-size: 12px; }
.state { font-variant-numeric: tabular-nums; color: var(--ink-2); font-size: 13px; }
.supply .supply-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
.supply .state { margin-top: 6px; }
.steps { display: inline-flex; gap: 6px; }
.tvrow .steps { margin-left: 8px; }
.steps button { min-height: 30px; padding: 3px 10px; font-variant-numeric: tabular-nums; }
.tvrow { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(90px, auto); gap: 4px 12px; align-items: center;
  padding: 8px 0; border-top: 1px solid var(--border); }
.tvrow .row { margin-top: 0; }
.tvrow .state { text-align: right; }
.tvrow .why { grid-column: 1 / -1; }
.tvrow .why:empty { display: none; }
.switches { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(220px, 100%), 1fr)); gap: 8px; }
.swtile { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2px 10px; align-items: center;
  padding: 8px 10px; border-radius: 10px; background: var(--surface-2); border: 1px solid var(--border); }
.swtile .why { grid-column: 1 / -1; }
.swtile .why:empty, .supply .why:empty { display: none; }
.toggle span { min-width: 0; }

/* monitor: toolbar, headline numbers, range totals */
.toolbar { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 12px 28px; padding: 12px 18px; }
.toolbar .spacer { flex: 1; }
.lab { font-size: 11px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.kpis { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(190px, 100%), 1fr)); gap: 10px; margin-bottom: 10px; }
.kpi { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 14px 16px; box-shadow: var(--shadow); }
.kpi .n, .stat .n { font-size: 12px; color: var(--muted); }
.kpi .v { font-size: 30px; font-weight: 600; letter-spacing: -0.02em; margin-top: 4px; }
.kpi .u, .stat .u { font-size: 13px; font-weight: 400; color: var(--ink-2); margin-left: 4px; }
.stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(160px, 100%), 1fr)); gap: 10px; margin-bottom: 16px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 10px 14px; }
.stat .v { font-size: 20px; font-weight: 600; margin-top: 2px; font-variant-numeric: tabular-nums; }
.chartgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(460px, 100%), 1fr)); gap: 12px; }
.chartgrid > * { min-width: 0; }

/* monitor: reading tables */
.subpanel { background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; min-width: 0; }
.subpanel h3:first-child { margin-top: 0; }
#readings > .circuits { margin-top: 14px; }
table.readings { width: 100%; border-collapse: collapse; font-size: 13px; margin-bottom: 10px; }
table.readings th { text-align: left; font-size: 11px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--muted); padding: 4px 8px; border-bottom: 1px solid var(--border); }
table.readings td { padding: 5px 8px; border-bottom: 1px solid var(--border); font-variant-numeric: tabular-nums; white-space: nowrap; }
table.readings td.desc { white-space: normal; }
table.readings tr:last-child td { border-bottom: 0; }
table.readings small { color: var(--ink-2); }
.on { color: var(--accent); font-weight: 600; }
input[type=datetime-local] { width: auto; }

/* schematic */
.schem svg { display: block; width: 100%; height: auto; font-family: inherit; }
.schem .pipe { fill: none; stroke-width: 3; stroke-linejoin: round; stroke-linecap: round; }
.schem .route { opacity: 0.2; transition: opacity 0.2s; }
.schem .route.open { opacity: 1; }
.schem .stem { stroke: var(--axis); stroke-width: 1.5; }
.schem .sym { fill: var(--surface-2); stroke: var(--ink-2); stroke-width: 1.5; }
.schem .symtxt { font-size: 10px; font-weight: 600; text-anchor: middle; fill: var(--ink); }
.schem .symtxt.small { font-size: 8.5px; }
.schem .rd { font-size: 12px; fill: var(--ink); font-variant-numeric: tabular-nums; }
.schem .rd.dim { fill: var(--muted); }
.schem .lbl { fill: var(--surface-2); stroke: var(--border); }
.schem .lbltxt { font-size: 13px; font-weight: 600; text-anchor: middle; fill: var(--ink); }
.schem .vlabel { font-size: 10px; text-anchor: middle; fill: var(--muted); }
.schem .rlabel { font-size: 12px; fill: var(--muted); }
.schem .valve { cursor: pointer; }
.schem .valve .body { fill: var(--muted); fill-opacity: 0.25; stroke: var(--muted); stroke-width: 1.5; transition: fill 0.2s, stroke 0.2s; }
.schem .valve:hover .body { stroke: var(--ink); }
.schem .valve.open .body { fill: var(--good); fill-opacity: 1; stroke: var(--good); filter: drop-shadow(0 0 6px rgba(12, 163, 12, 0.6)); }
.schem .valve.open .vlabel { fill: var(--ink); }
.schem .valve.unknown .body { fill: none; stroke: var(--warning); stroke-dasharray: 3 3; }
.schem .valve.blocked { cursor: not-allowed; }  /* the reason is in the tooltip; open stays full green */
.schem .mod { fill: var(--surface-2); stroke: var(--ink-2); stroke-width: 1.5; }
.schem .modtxt { font-size: 14px; font-weight: 600; text-anchor: middle; fill: var(--ink); font-variant-numeric: tabular-nums; }
.schem .modsub { font-size: 12px; text-anchor: middle; fill: var(--ink-2); }
.schem .ind { fill: none; stroke: var(--muted); stroke-width: 1.5; }
.schem .ind.on { fill: var(--good); stroke: var(--good); }
.schem .ind.bad { fill: var(--critical); stroke: var(--critical); }
.schem .pol { cursor: pointer; }
.schem .pol rect { fill: var(--surface); stroke: var(--ink-2); stroke-width: 1.5; }
.schem .pol:hover rect { stroke: var(--ink); }
.schem .pol.rev rect { fill: var(--accent); stroke: var(--accent); }
.schem .poltxt { font-size: 13px; font-weight: 600; text-anchor: middle; fill: var(--ink); }
.schem .pol.rev .poltxt { fill: #fff; }
.schem .pol.blocked { cursor: not-allowed; opacity: 0.6; }

/* charts */
.charts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }  /* laptop: four per row */
.chart { position: relative; }
.chart svg { display: block; margin-top: 6px; max-width: 100%; }
.chart .empty { padding: 30px 0; text-align: center; }
.legend { display: flex; flex-wrap: wrap; gap: 4px 14px; margin-top: 4px; font-size: 12px; color: var(--ink-2); }
.legend i, .tip i { display: inline-block; width: 10px; height: 3px; border-radius: 2px; margin-right: 6px; vertical-align: middle; }
.axis text, text.end { font-size: 11px; font-variant-numeric: tabular-nums; }
.axis text.caption { fill: var(--ink-2); font-weight: 600; letter-spacing: 0.02em; }
text.end { fill: var(--ink-2); }
.chart .title { font-weight: 600; font-size: 13px; display: flex; align-items: baseline; gap: 6px; }
.chart .title .why { flex: 1; }
button.mini { margin-left: auto; min-height: 0; padding: 2px 8px; font-size: 11px; border-radius: 6px; color: var(--muted); }
.chart .title .why { font-weight: 400; margin-left: 6px; }
.tip { display: flex; flex-wrap: wrap; gap: 2px 12px; min-height: 18px; margin-top: 4px; font-size: 12px; color: var(--ink-2);
  font-variant-numeric: tabular-nums; }  /* hover readout under the chart, so it never covers the lines */
.axis text { fill: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }