/* ============================================================
     SCADA Wiz — a control-room toolbox
     Visual direction: instrument panel. Not a cream-serif blog,
     not a neon-on-black dashboard. Think the front of a bench
     multimeter: graphite metal, a recessed amber readout, a
     single live "signal" accent (NAMUR amber-green), monospace
     numerics that look like they belong on a 7-segment display.
     ============================================================ */

  :root {
    --panel:        #21262b;   /* instrument face */
    --panel-edge:   #161a1e;   /* recessed shadow */
    --panel-light:  #2b3137;   /* raised key */
    --readout-bg:   #11211d;   /* recessed LCD well */
    --readout:      #6fe39b;   /* live signal green */
    --readout-dim:  #3c6b54;
    --amber:        #f4b740;   /* fault / attention */
    --amber-deep:   #b5791a;
    --ink:          #d7dde2;   /* engraved label */
    --ink-dim:      #8a949c;
    --hair:         #3a4147;   /* engraved hairline */
    --bad:          #e0644b;   /* over-range / fault */
    --field-mono:   'IBM Plex Mono', ui-monospace, 'Cascadia Mono', Menlo, monospace;
    --field-sans:   'Inter', 'Segoe UI', system-ui, sans-serif;
  }

  @import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=Inter:wght@400;500;600;700&display=swap');

  * { box-sizing: border-box; }

  body {
    margin: 0;
    background:
      radial-gradient(ellipse at top, #2a3036 0%, #181c20 70%) fixed;
    color: var(--ink);
    font-family: var(--field-sans);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
  }

  .wrap { max-width: 1180px; margin: 0 auto; padding: 0 20px 80px; }

  /* ---- header: the instrument nameplate ---- */
  header {
    padding: 48px 0 36px;
    border-bottom: 1px solid var(--hair);
    margin-bottom: 36px;
  }
  .nameplate {
    display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap;
  }
  .mark {
    font-family: var(--field-mono);
    font-weight: 600;
    font-size: clamp(28px, 5vw, 44px);
    letter-spacing: -0.5px;
    color: var(--ink);
    margin: 0;
  }
  .mark b { color: var(--readout); font-weight: 600; }
  .tag {
    color: var(--ink-dim);
    font-size: 14px;
    font-family: var(--field-mono);
    letter-spacing: 0.3px;
  }
  .sub {
    margin-top: 14px;
    color: var(--ink-dim);
    font-size: 15px;
    max-width: 640px;
  }
  .runline {
    margin-top: 18px;
    display: inline-flex; align-items: center; gap: 8px;
    font-family: var(--field-mono); font-size: 12px;
    color: var(--readout-dim);
    text-transform: uppercase; letter-spacing: 1px;
  }
  .runline::before {
    content: ""; width: 7px; height: 7px; border-radius: 50%;
    background: var(--readout);
    box-shadow: 0 0 8px var(--readout);
    animation: pulse 2.4s ease-in-out infinite;
  }
  @keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.35} }

  /* ---- grid of instruments ---- */
  .grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 22px;
  }
  @media (max-width: 820px) { .grid { grid-template-columns: 1fr; } }

  .tool {
    background: linear-gradient(160deg, var(--panel) 0%, var(--panel-edge) 130%);
    border: 1px solid var(--hair);
    border-radius: 10px;
    padding: 22px 22px 24px;
    box-shadow:
      0 1px 0 rgba(255,255,255,0.03) inset,
      0 18px 40px -28px #000;
  }
  .tool h2 {
    margin: 0 0 4px;
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 0.2px;
    display: flex; align-items: center; gap: 10px;
  }
  .tool h2 .idx {
    font-family: var(--field-mono);
    font-size: 11px;
    color: var(--readout-dim);
    border: 1px solid var(--hair);
    border-radius: 4px;
    padding: 2px 6px;
  }
  .tool .blurb {
    color: var(--ink-dim); font-size: 13px; margin: 0 0 18px;
  }

  label {
    display: block;
    font-size: 11px; text-transform: uppercase; letter-spacing: 0.8px;
    color: var(--ink-dim); margin: 0 0 5px;
    font-family: var(--field-mono);
  }
  .row { display: flex; gap: 12px; flex-wrap: wrap; }
  .row > .fld { flex: 1; min-width: 110px; }
  .fld { margin-bottom: 14px; }

  input[type="text"], input[type="number"], select {
    width: 100%;
    background: #1a1f23;
    border: 1px solid var(--hair);
    border-radius: 6px;
    color: var(--ink);
    font-family: var(--field-mono);
    font-size: 15px;
    padding: 9px 11px;
    transition: border-color .15s, box-shadow .15s;
  }
  input:focus, select:focus {
    outline: none;
    border-color: var(--readout-dim);
    box-shadow: 0 0 0 3px rgba(111,227,155,0.12);
  }
  select { cursor: pointer; }

  .seg {
    display: inline-flex; border: 1px solid var(--hair); border-radius: 6px;
    overflow: hidden; margin-bottom: 14px;
  }
  .seg button {
    background: #1a1f23; color: var(--ink-dim);
    border: none; padding: 7px 13px; cursor: pointer;
    font-family: var(--field-mono); font-size: 12px;
    border-right: 1px solid var(--hair);
  }
  .seg button:last-child { border-right: none; }
  .seg button.on { background: var(--panel-light); color: var(--readout); }

  /* ---- the recessed readout well ---- */
  .readout {
    background: var(--readout-bg);
    border: 1px solid #0c1714;
    border-radius: 7px;
    padding: 14px 16px;
    margin-top: 6px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.4) inset;
  }
  .readout .line {
    display: flex; justify-content: space-between; align-items: baseline;
    padding: 4px 0;
    border-bottom: 1px dashed rgba(111,227,155,0.12);
  }
  .readout .line:last-child { border-bottom: none; }
  .readout .k {
    font-size: 11px; color: var(--readout-dim);
    text-transform: uppercase; letter-spacing: 0.8px;
    font-family: var(--field-mono);
  }
  .readout .v {
    font-family: var(--field-mono);
    font-size: 17px; color: var(--readout);
    font-weight: 500;
    text-shadow: 0 0 12px rgba(111,227,155,0.25);
  }
  .readout .v.flag { color: var(--bad); text-shadow: 0 0 12px rgba(224,100,75,0.3); }
  .readout .v.warn { color: var(--amber); text-shadow: 0 0 12px rgba(244,183,64,0.3); }

  .note {
    margin-top: 10px; font-size: 12px; color: var(--ink-dim);
    font-family: var(--field-mono);
  }
  .note.alert { color: var(--amber); }

  footer {
    margin-top: 56px; padding-top: 24px;
    border-top: 1px solid var(--hair);
    color: var(--ink-dim); font-size: 13px;
    font-family: var(--field-mono);
    display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  }

  @media (prefers-reduced-motion: reduce) {
    .runline::before { animation: none; }
  }
  /* ---- multi-page additions: nav, spoke layout ---- */
  .mark-link { text-decoration: none; }
  .calcnav {
    display: flex; flex-wrap: wrap; gap: 6px;
    margin-bottom: 32px;
  }
  .calcnav a {
    font-family: var(--field-mono); font-size: 12px;
    color: var(--ink-dim); text-decoration: none;
    padding: 6px 12px; border: 1px solid var(--hair); border-radius: 6px;
    background: #1a1f23; transition: color .15s, border-color .15s;
  }
  .calcnav a:hover { color: var(--readout); border-color: var(--readout-dim); }
  .calcnav a.active { color: var(--readout); border-color: var(--readout-dim); background: var(--panel-light); }

  .grid-single { grid-template-columns: 1fr; max-width: 640px; }
  .page-h1 {
    font-size: 22px; font-weight: 700; margin: 0 0 18px;
    letter-spacing: -0.3px;
  }
  main.single { margin-bottom: 8px; }

  .more {
    margin-top: 48px; padding-top: 28px; border-top: 1px solid var(--hair);
  }
  .more h3 {
    font-size: 13px; text-transform: uppercase; letter-spacing: 1px;
    color: var(--ink-dim); font-family: var(--field-mono); margin: 0 0 14px;
  }
  .wrap-nav { margin-bottom: 0; }
  .scale-chart {
    display: block; width: 100%; height: 150px;
    margin-top: 8px;
    cursor: ew-resize;
  }