:root {
  --bg: #07101a;
  --panel: #0e1a26;
  --panel-2: #15212f;
  --line: #1f334a;
  --ink: #e6f0fa;
  --ink-dim: #8aa4bf;
  --accent: #ff8a00;
  --ok: #4ade80;
  --warn: #facc15;
  --bad: #f87171;
  --aqua: #7ee0c2;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 800px at 50% -10%, #122236 0%, var(--bg) 60%) fixed;
  color: var(--ink);
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  font-size: 14px;
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: linear-gradient(180deg, #0d1a28, #0a1420);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand h1 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.3px;
  margin: 0;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bad);
  box-shadow: 0 0 8px var(--bad);
}

.dot.live {
  background: var(--ok);
  box-shadow: 0 0 10px var(--ok);
  animation: pulse 1.6s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.status {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.kpi {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  min-width: 110px;
}

.kpi .k {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--ink-dim);
}

.kpi .v {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 15px;
  font-weight: 600;
  color: var(--aqua);
}

#mode {
  color: var(--accent);
}

.stage {
  padding: 18px;
  display: flex;
  justify-content: center;
}

#plant {
  width: 100%;
  max-width: 1500px;
  height: auto;
  background: linear-gradient(180deg, #0a121c 0%, #08101a 100%);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), inset 0 0 80px rgba(0, 0, 0, 0.3);
}

/* SVG text styles */
.lbl {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  fill: var(--ink-dim);
  text-transform: uppercase;
}

.lbl-sm {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  fill: var(--ink-dim);
  letter-spacing: 0.5px;
}

.lbl-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 600;
  fill: var(--aqua);
}

/* Smooth visual transitions for dynamic SVG state */
#aerationWater, #treatedWater, #inletWater, #anaerobicWater,
#settlerWater, #disinfectWater {
  transition: y 1.2s ease-out, height 1.2s ease-out;
}
#settlerSludge, #anaerobicSludge {
  transition: d 1.5s ease-out, y 1.5s ease-out, height 1.5s ease-out;
}
#bubbles .bub {
  transition: opacity 0.6s linear, animation-duration 0.6s linear;
}

/* Bubble animation */
.bub {
  animation: rise 2.4s linear infinite;
  transform-origin: center;
  transform-box: fill-box;
}

@keyframes rise {
  0%   { transform: translateY(0px) scale(0.6); opacity: 0; }
  10%  { opacity: 0.9; }
  80%  { opacity: 0.8; }
  100% { transform: translateY(-175px) scale(1.15); opacity: 0; }
}

.bub-slow {
  animation: rise-slow 5s ease-in infinite;
  transform-origin: center;
  transform-box: fill-box;
}

@keyframes rise-slow {
  0%   { transform: translateY(0px) scale(0.5); opacity: 0; }
  15%  { opacity: 0.7; }
  85%  { opacity: 0.6; }
  100% { transform: translateY(-145px) scale(1); opacity: 0; }
}

/* Rotor (blower) spin */
.rotor {
  transform-origin: 0 0;
  animation: spin 1.4s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* Sludge dashed flow */
.ras-flow, .was-flow {
  stroke-dasharray: 6 8;
  animation: dash 1.2s linear infinite;
}

@keyframes dash {
  to { stroke-dashoffset: -28; }
}

/* Bottom panel */
.panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding: 0 18px 18px;
  max-width: 1500px;
  margin: 0 auto;
}

.panel.four-cols {
  grid-template-columns: repeat(4, 1fr);
}

.card.controls .ctl {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 6px 0;
  border-bottom: 1px solid rgba(31, 51, 74, 0.5);
}
.card.controls .ctl:last-child { border-bottom: none; }
.card.controls label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--ink-dim);
}
.card.controls label span {
  font-family: 'JetBrains Mono', monospace;
  color: var(--aqua);
  font-weight: 600;
  font-size: 12px;
}
.card.controls input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: linear-gradient(90deg, var(--aqua), var(--accent));
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
.card.controls input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--accent);
  cursor: pointer;
}
.card.controls input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--accent);
  cursor: pointer;
}

.card {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--ink-dim);
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}

.row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
}

.row span {
  color: var(--ink-dim);
  font-size: 12px;
}

.row b {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--aqua);
  font-weight: 600;
}

.row b.ok { color: var(--ok); }
.row b.warn { color: var(--warn); }
.row b.bad { color: var(--bad); }

.alarms {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.alarm {
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 12px;
  border-left: 3px solid var(--ok);
  background: rgba(74, 222, 128, 0.08);
  color: var(--ok);
}

.alarm.warn {
  border-left-color: var(--warn);
  background: rgba(250, 204, 21, 0.08);
  color: var(--warn);
}

.alarm.bad {
  border-left-color: var(--bad);
  background: rgba(248, 113, 113, 0.1);
  color: var(--bad);
}

.footbar {
  padding: 10px 20px;
  border-top: 1px solid var(--line);
  color: var(--ink-dim);
  font-size: 11px;
  display: flex;
  gap: 10px;
  align-items: center;
}

.footbar code {
  color: var(--aqua);
  background: rgba(126, 224, 194, 0.08);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 11px;
}

.sep { opacity: 0.5; }

@media (max-width: 1100px) {
  .panel.four-cols { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .panel,
  .panel.four-cols { grid-template-columns: 1fr; }
  .status { gap: 10px; }
  .kpi { min-width: 80px; }
}