/* CircuitGauge: графит + сигнальный жёлтый, медь как второй акцент, моноширинные числа. */
:root {
  --ink: #16191d; --panel: #ffffff; --bg: #f2f1ec; --text: #1d2126; --muted: #5d636b; --line: #d6d4cc;
  --volt: #f5c518; --volt-ink: #6b5200; --volt-wash: #fdf4cc; --copper: #b8642f; --ok: #1f7a4a; --warn: #a33b1d;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #0b0d10; --panel: #1b1f24; --bg: #121519; --text: #e6e8eb; --muted: #9aa1aa; --line: #2c3238;
    --volt: #f5c518; --volt-ink: #f5c518; --volt-wash: #2b2610; --copper: #e08b55; --ok: #5fd197; --warn: #ff8a6b; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 var(--sans); }
a { color: inherit; text-decoration-color: var(--copper); text-underline-offset: 3px; }
a:hover { color: var(--copper); }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -999px; } .skip:focus { left: 8px; top: 8px; background: var(--volt); color: #000; padding: 6px 10px; z-index: 9; }

.top { background: var(--ink); color: #f4f4f1; border-bottom: 3px solid var(--volt); }
.top-in { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 60px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 600; letter-spacing: .02em; font-size: 19px; }
.brand b { color: var(--volt); font-weight: 800; }
.top nav ul { list-style: none; display: flex; gap: 4px; margin: 0; padding: 0; flex-wrap: wrap; }
.top nav a { display: block; padding: 6px 10px; border-radius: 6px; text-decoration: none; font-size: 15px; color: #d9dbde; }
.top nav a:hover, .top nav a[aria-current] { background: #2a2f36; color: var(--volt); }

.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 18px 0 0; font-size: 14px; color: var(--muted); }
.crumbs li + li::before { content: "›"; margin-right: 6px; }
h1 { font-size: clamp(28px, 4.4vw, 40px); line-height: 1.15; margin: 18px 0 10px; letter-spacing: -.01em; }
h2 { font-size: 25px; line-height: 1.25; margin: 40px 0 10px; padding-top: 12px; border-top: 1px solid var(--line); }
h3 { font-size: 19px; margin: 24px 0 6px; }
.lead { font-size: 19px; margin: 0 0 18px; }
.answer { background: var(--volt-wash); border-left: 5px solid var(--volt); padding: 14px 16px; border-radius: 0 10px 10px 0; margin: 0 0 22px; }
.answer strong { font-family: var(--mono); }
.note { font-size: 15px; color: var(--muted); }
.small { font-size: 13px; color: var(--muted); }
code, .num { font-family: var(--mono); font-size: .93em; }

.calc { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 18px; margin: 10px 0 26px; box-shadow: 0 1px 0 rgba(0,0,0,.04); }
.calc h2 { border: 0; margin: 0 0 12px; padding: 0; font-size: 20px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 12px 14px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.field input, .field select { width: 100%; font: 16px var(--sans); padding: 9px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--text); }
.field input:focus, .field select:focus { outline: 2px solid var(--volt); outline-offset: 1px; }
.check { display: flex; gap: 8px; align-items: flex-start; font-size: 15px; margin-top: 12px; }
.result { margin-top: 16px; border-top: 2px dashed var(--line); padding-top: 14px; }
.big { font: 700 34px/1.1 var(--mono); }
.big small { font: 500 16px var(--sans); color: var(--muted); }
.kv { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; margin-top: 12px; }
.kv div { background: var(--bg); border-radius: 8px; padding: 8px 10px; font-size: 14px; }
.kv b { display: block; font: 700 18px var(--mono); }
.why { margin: 12px 0 0; font-size: 15px; }
.bad { color: var(--warn); } .good { color: var(--ok); }

.tbl { overflow-x: auto; margin: 12px 0 18px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { padding: 7px 10px; text-align: right; border-bottom: 1px solid var(--line); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
thead th { background: var(--ink); color: #f1f1ee; font-weight: 600; font-size: 14px; position: sticky; top: 0; }
tbody tr:nth-child(even) { background: color-mix(in srgb, var(--bg) 60%, transparent); }
td { font-family: var(--mono); }
caption { caption-side: bottom; text-align: left; padding: 8px 10px; font-size: 13px; color: var(--muted); }
tr.hl td { background: var(--volt-wash); font-weight: 700; }

.formula { font-family: var(--mono); background: var(--ink); color: #f3f3ef; padding: 12px 14px; border-radius: 10px; overflow-x: auto; }
.formula b { color: var(--volt); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; padding: 0; list-style: none; }
.cards a { display: block; height: 100%; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; text-decoration: none; }
.cards a:hover { border-color: var(--volt); }
.cards span { display: block; font-size: 14px; color: var(--muted); }
details { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; margin: 8px 0; }
summary { cursor: pointer; font-weight: 600; }
figure { margin: 16px 0; } figcaption { font-size: 13px; color: var(--muted); }
svg text { font-family: var(--mono); fill: var(--text); }

.foot { margin-top: 56px; background: var(--ink); color: #c9ccd0; padding: 24px 0 16px; font-size: 15px; }
.foot-in { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.foot-in > div { max-width: 560px; } .foot p { margin: 6px 0; }
.foot ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; }
.foot a { color: #e9eaec; } .foot .small { color: #8f959c; margin-top: 16px; }
@media print { .top, .foot, .calc .grid { display: none; } }