.oil-diagram {
  --bg: #0b1c2c;
  --grid: #14304a;
  --panel: #0f2033;
  --box-fill: #173350;
  --box-fill2: #1d3e61;
  --box-stroke: #5aa9d6;
  --box-stroke-dim: #2f5a7d;
  --text: #eaf3fb;
  --text-dim: #9db6cc;
  --amber: #f2b134;
  --supply: #4ade80;
  --scavenge: #fb923c;
  --return: #ef4444;
  --air: #7e93a8;
  background:
    repeating-linear-gradient(0deg, var(--grid) 0px, var(--grid) 1px, transparent 1px, transparent 42px),
    repeating-linear-gradient(90deg, var(--grid) 0px, var(--grid) 1px, transparent 1px, transparent 42px),
    var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Helvetica, Arial, sans-serif;
  border-radius: 10px;
  padding: 22px 22px 40px;
}

.oil-diagram * {
  box-sizing: border-box;
}

.oil-diagram .mono {
  font-family: "Consolas", "SFMono-Regular", Menlo, monospace;
}

.oil-diagram header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  border-bottom: 1px solid var(--box-stroke-dim);
  padding-bottom: 14px;
  margin-bottom: 16px;
}

.oil-diagram header h1 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.3px;
  margin: 0 0 4px;
  color: var(--text);
}

.oil-diagram header p {
  margin: 0;
  color: var(--text-dim);
  font-size: 13px;
}

.oil-diagram .tag {
  display: inline-block;
  font-family: "Consolas", monospace;
  font-size: 11px;
  color: var(--amber);
  border: 1px solid rgba(242, 177, 52, 0.45);
  padding: 2px 8px;
  border-radius: 3px;
  margin-bottom: 6px;
  letter-spacing: 0.5px;
}

.oil-diagram .controls {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--box-stroke-dim);
  border-radius: 6px;
  padding: 12px 16px;
  margin-bottom: 16px;
}

.oil-diagram .control-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.oil-diagram .control-group .glabel {
  font-family: "Consolas", monospace;
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.6px;
  margin-right: 4px;
}

.oil-diagram .spool-btn {
  background: var(--box-fill);
  border: 1px solid var(--box-stroke-dim);
  color: var(--text-dim);
  padding: 7px 14px;
  border-radius: 5px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.oil-diagram .spool-btn:hover {
  border-color: var(--box-stroke);
  color: var(--text);
}

.oil-diagram .spool-btn.active {
  background: linear-gradient(180deg, #2a4d70, #1c3a5a);
  border-color: var(--amber);
  color: var(--text);
  box-shadow: 0 0 0 1px rgba(242, 177, 52, 0.25) inset;
}

.oil-diagram .line-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 5px;
  border: 1px solid transparent;
  font-size: 13px;
  color: var(--text-dim);
  user-select: none;
}

.oil-diagram .line-toggle input {
  accent-color: var(--amber);
  cursor: pointer;
}

.oil-diagram .line-toggle .swatch {
  width: 22px;
  height: 4px;
  border-radius: 2px;
  display: inline-block;
}

.oil-diagram .line-toggle.dimmed {
  color: #5c7086;
}

.oil-diagram .line-toggle.dimmed .swatch {
  opacity: 0.35;
}

.oil-diagram .legend-supply .swatch {
  background: var(--supply);
}

.oil-diagram .legend-scavenge .swatch {
  background: var(--scavenge);
}

.oil-diagram .legend-return .swatch {
  background: var(--return);
}

.oil-diagram .stage-wrap {
  background: var(--panel);
  border: 1px solid var(--box-stroke-dim);
  border-radius: 8px;
  padding: 10px;
  position: relative;
  overflow: auto;
}

.oil-diagram svg {
  display: block;
  width: 100%;
  height: auto;
  min-width: 1100px;
}

.oil-diagram .comp-box {
  fill: var(--box-fill);
  stroke: var(--box-stroke);
  stroke-width: 1.5;
  cursor: pointer;
  transition: fill 0.12s ease;
}

.oil-diagram .comp-box:hover {
  fill: var(--box-fill2);
  stroke: var(--amber);
}

.oil-diagram .comp-box.filter {
  fill: url(#oil-hatch);
}

.oil-diagram .comp-label {
  fill: var(--text);
  font-size: 12.5px;
  font-family: "Segoe UI", Arial, sans-serif;
  text-anchor: middle;
  pointer-events: none;
}

.oil-diagram .comp-label.small {
  font-size: 10.5px;
}

.oil-diagram .sublabel {
  fill: var(--text-dim);
  font-size: 10px;
  text-anchor: middle;
  pointer-events: none;
  font-family: "Consolas", monospace;
}

.oil-diagram .group-title {
  fill: var(--text-dim);
  font-size: 11px;
  font-family: "Consolas", monospace;
  letter-spacing: 1px;
}

.oil-diagram .flow-line {
  fill: none;
  stroke-linecap: butt;
  stroke-linejoin: round;
}

.oil-diagram .flow-line.supply {
  stroke: var(--supply);
}

.oil-diagram .flow-line.scavenge {
  stroke: var(--scavenge);
}

.oil-diagram .flow-line.return {
  stroke: var(--return);
}

.oil-diagram .flow-anim {
  stroke-dasharray: 9 7;
  animation: oil-flowmove 0.55s linear infinite;
}

@keyframes oil-flowmove {
  to {
    stroke-dashoffset: -32;
  }
}

@media (prefers-reduced-motion: reduce) {
  .oil-diagram .flow-anim {
    animation: none;
  }
}

.oil-diagram .static-line {
  fill: none;
  stroke: var(--air);
  stroke-width: 1.6;
  stroke-dasharray: 3 4;
  opacity: 0.8;
}

.oil-diagram .static-label {
  fill: var(--air);
  font-size: 13.5px;
  font-family: "Consolas", monospace;
}

.oil-diagram .hidden {
  opacity: 0 !important;
}

.oil-diagram .tooltip {
  position: fixed;
  max-width: 280px;
  background: #0c1f31;
  border: 1px solid var(--amber);
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--text);
  pointer-events: none;
  z-index: 50;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
  display: none;
}

.oil-diagram .tooltip .t-title {
  color: var(--amber);
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 4px;
  display: block;
  letter-spacing: 0.2px;
}

.oil-diagram footer {
  margin-top: 14px;
  color: var(--text-dim);
  font-size: 11.5px;
  text-align: center;
}