:root {
    --bg: #0f172a;
    --panel: #111827;
    --panel2: #162033;
    --stroke: #64748b;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --cyan: #22d3ee;
    --green: #34d399;
    --amber: #fbbf24;
    --red: #fb7185;
    --blue: #60a5fa;
    --hot: #f97316;
    --cool: #38bdf8;
  }
  * { box-sizing: border-box; }
  body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at top left, #172554 0, var(--bg) 42%, #020617 100%);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  }
  .wrap {
    width: 100%;
    max-width: 1800px;
    margin: 0 auto;
    padding: 26px;
  }
  .topbar {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: center;
    margin-bottom: 18px;
    flex-wrap: wrap;
  }
  h1 { margin: 0; font-size: clamp(24px, 3.5vw, 42px); letter-spacing: -.04em; }
  .subtitle { color: var(--muted); margin-top: 4px; }
  .controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
  }
  button {
    color: var(--text);
    background: #0b1220;
    border: 1px solid #253247;
    padding: 10px 14px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 650;
  }
  button.active {
    border-color: var(--cyan);
    box-shadow: 0 0 0 1px rgba(34,211,238,.28) inset;
  }
  .switch {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 14px;
    border: 1px solid #253247;
    background: #0b1220;
    color: var(--text);
    font-weight: 700;
  }
  .switch input { display: none; }
  .slider {
    width: 54px;
    height: 30px;
    border-radius: 999px;
    position: relative;
    background: #233044;
    transition: .2s ease;
    box-shadow: inset 0 0 0 1px rgba(100,116,139,.35);
  }
  .slider::after {
    content: "";
    position: absolute;
    left: 4px;
    top: 4px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: #cbd5e1;
    transition: .2s ease;
  }
  .switch input:checked + .slider {
    background: rgba(34,211,238,.28);
    box-shadow: inset 0 0 0 1px rgba(34,211,238,.5);
  }
  .switch input:checked + .slider::after {
    transform: translateX(24px);
    background: var(--cyan);
  }

  .card {
    background: rgba(17,24,39,.78);
    border: 1px solid rgba(100,116,139,.28);
    box-shadow: 0 22px 80px rgba(0,0,0,.34);
    border-radius: 28px;
    overflow: hidden;
  }
  .svg-shell {
    width: 100%;
    overflow: hidden;
  }

  svg#ahu {
    width: 100%;
    height: auto;
    display: block;
  }

  .label { fill: var(--muted); font-size: 13px; font-weight: 700; letter-spacing: .02em; }
  .value { fill: var(--text); font-size: 16px; font-weight: 800; }
  .small { fill: var(--muted); font-size: 11px; font-weight: 650; }
  .readout { fill: #0b1220; stroke: #27354b; stroke-width: 1.2; }
  .setpoint { fill: rgba(251,191,36,.13); stroke: rgba(251,191,36,.7); }
  .duct {
    fill: url(#ductGrad);
    stroke: rgba(148,163,184,.45);
    stroke-width: 1.5;
  }

  /* same visual style as earlier: simple dashed airflow */
  .flow {
    fill: none;
    stroke-width: 4;
    stroke-linecap: round;
    stroke-dasharray: 14 18;
    opacity: .95;
  }
  .supply-flow {
    stroke: var(--cyan);
    animation: supplyDash 1.05s linear infinite;
  }
  .extract-flow {
    stroke: var(--amber);
    animation: extractDash 1.05s linear infinite;
  }
  @keyframes supplyDash { to { stroke-dashoffset: -32; } } /* left -> right */
  @keyframes extractDash { to { stroke-dashoffset: 32; } }  /* right -> left */

  .hot-water, .cool-water {
    fill: none;
    stroke-width: 4;
    stroke-linecap: round;
    stroke-dasharray: 8 13;
    animation: waterDash .85s linear infinite;
  }
  .hot-water { stroke: var(--hot); }
  .cool-water { stroke: var(--cool); }
  @keyframes waterDash { to { stroke-dashoffset: -21; } }

  /* use CSS only inside local nested SVG viewBoxes: no orbiting around the page */
  .fan-rotor {
    transform-box: view-box;
    transform-origin: 52px 52px;
    animation: spin .95s linear infinite;
  }
  .pump-impeller {
    transform-box: view-box;
    transform-origin: 28px 28px;
    animation: spin 1.15s linear infinite;
  }
  .wheelSpin {
    transform-box: fill-box;
    transform-origin: center;
    animation: wheelRotate 5.5s linear infinite;
  }
  .beltMove {
    stroke-dasharray: 22 18;
    animation: dashReverse 1s linear infinite;
  }
  .motorSpin {
    transform-box: fill-box;
    transform-origin: center;
    animation: motorRotate 1.4s linear infinite;
  }
  @keyframes wheelRotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
  }
  @keyframes motorRotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(-360deg); }
  }
  @keyframes dashReverse {
    to { stroke-dashoffset: 40; }
  }
  @keyframes spin { to { transform: rotate(360deg); } }

  .stopped .flow,
  .stopped .hot-water,
  .stopped .cool-water {
    animation-play-state: paused;
    opacity: .16;
  }
  .stopped .fan-rotor,
  .stopped .wheelSpin,
  .stopped .beltMove,
  .stopped .motorSpin,
  .stopped .pump-impeller {
    animation-play-state: paused;
    opacity: .28;
  }
  .stopped .damper-blade { opacity: .35; }

  .note {
    padding: 18px 22px 22px;
    color: var(--muted);
    border-top: 1px solid rgba(100,116,139,.22);
    display: grid;
    gap: 8px;
  }
  code { color: var(--cyan); }


.box-label {
  fill: var(--muted);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .005em;
}

.box-value {
  fill: var(--text);
  font-size: 18px;
  font-weight: 900;
}

.duct-label {
  opacity: .96;
}


.point-label {
  fill: var(--muted);
  font-size: 9.6px;
  font-weight: 800;
  text-anchor: middle;
  letter-spacing: .01em;
}


/* operator panel */
button.indicator:disabled {
  cursor: default;
  opacity: .78;
}
button.indicator.active:disabled {
  opacity: 1;
}

.operator-panel {
  border-top: 1px solid rgba(100,116,139,.22);
  padding: 24px;
  background: rgba(2,6,23,.28);
}
.panel-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.panel-heading h2 {
  margin: 2px 0 0;
  font-size: clamp(20px, 2.4vw, 30px);
  letter-spacing: -.025em;
}
.eyebrow,
.telemetry-heading {
  color: var(--cyan);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .14em;
}
.panel-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.panel-actions button {
  min-width: 150px;
}
.mini-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid #253247;
  background: #0b1220;
  padding: 9px 12px;
  border-radius: 12px;
  color: var(--text);
  font-weight: 750;
  font-size: 13px;
}
.mini-toggle input {
  accent-color: var(--cyan);
}
.control-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(210px, 1fr));
  gap: 12px;
}
.control-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 7px 12px;
  align-items: center;
  min-width: 0;
  padding: 14px;
  border-radius: 16px;
  border: 1px solid rgba(100,116,139,.24);
  background: rgba(11,18,32,.8);
}
.control-title {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}
.control-value {
  font-size: 17px;
  font-weight: 900;
}
.control-card input[type="range"],
.control-card select {
  grid-column: 1 / -1;
  width: 100%;
}
.control-card input[type="range"] {
  accent-color: var(--cyan);
}
.control-card select {
  color: var(--text);
  background: #111827;
  border: 1px solid #334155;
  border-radius: 10px;
  padding: 8px 10px;
  font-weight: 750;
}
.control-help {
  grid-column: 1 / -1;
  color: #718096;
  font-size: 10.5px;
  line-height: 1.4;
}
.telemetry-heading {
  margin: 24px 0 10px;
}
.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(180px, 1fr));
  gap: 10px;
}
.telemetry-card {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
  border: 1px solid rgba(100,116,139,.2);
  border-radius: 14px;
  padding: 12px 14px;
  background: rgba(15,23,42,.72);
}
.telemetry-card span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 750;
}
.telemetry-card strong {
  font-size: 14px;
  text-align: right;
}
.alarm-summary {
  margin-top: 12px;
  border: 1px solid rgba(52,211,153,.28);
  background: rgba(52,211,153,.07);
  border-radius: 14px;
  padding: 11px 14px;
  color: #a7f3d0;
  font-weight: 800;
  font-size: 12px;
}
.alarm-summary.has-alarm {
  border-color: rgba(251,113,133,.42);
  background: rgba(251,113,133,.08);
  color: #fecdd3;
}

@media (max-width: 1200px) {
  .control-grid { grid-template-columns: repeat(2, minmax(210px, 1fr)); }
  .telemetry-grid { grid-template-columns: repeat(2, minmax(180px, 1fr)); }
}
@media (max-width: 680px) {
  .wrap { padding: 12px; }
  .operator-panel { padding: 18px 14px; }
  .control-grid,
  .telemetry-grid { grid-template-columns: 1fr; }
}