:root {
  --bg-1: #f4f6fb;
  --bg-2: #dbe6ff;
  --ink-1: #0f172a;
  --ink-2: #334155;
  --panel: rgba(255, 255, 255, 0.88);
  --line-grid: rgba(15, 23, 42, 0.12);
  --pulse: #0d6efd;
  --avg: #0ea5e9;
  --target: #f43f5e;
  --accent: #1d4ed8;
  --axis-font-size: 18px;
  --axis-font-family: "IBM Plex Sans", "Segoe UI", Tahoma, sans-serif;
  --radius-lg: 16px;
  --radius-sm: 10px;
  --shadow: 0 16px 36px rgba(15, 23, 42, 0.13);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", "Segoe UI", Tahoma, sans-serif;
  color: var(--ink-1);
  background:
    radial-gradient(circle at 7% 12%, rgba(29, 78, 216, 0.2), transparent 35%),
    radial-gradient(circle at 88% 8%, rgba(14, 165, 233, 0.18), transparent 32%),
    linear-gradient(130deg, var(--bg-1), var(--bg-2));
}

.wrap {
  width: min(1220px, 95vw);
  margin: 20px auto 44px;
  display: grid;
  gap: 16px;
}

.hero {
  padding: 20px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  background: linear-gradient(120deg, rgba(15, 23, 42, 0.95), rgba(30, 64, 175, 0.9));
  color: #eff6ff;
}

.hero h1 {
  margin: 0 0 8px;
  font-family: "Space Grotesk", "Trebuchet MS", sans-serif;
  font-size: clamp(1.4rem, 2.5vw, 2rem);
}

.hero p {
  margin: 0;
  color: #dbeafe;
}

.panel {
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  padding: 14px;
}

.app-grid {
  display: grid;
  grid-template-columns: 330px 1fr;
  gap: 14px;
}

.controls {
  display: grid;
  gap: 10px;
  align-content: start;
  position: sticky;
  top: 12px;
  align-self: start;
}

.control {
  background: #ffffff;
  border: 1px solid #dbeafe;
  border-radius: var(--radius-sm);
  padding: 9px;
  display: grid;
  gap: 5px;
}

.control label {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 700;
}

.control input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.unit {
  color: var(--ink-2);
  font-size: 0.85rem;
  font-weight: 600;
}

.row-control {
  grid-template-columns: 1fr;
}

#matchDuty {
  border: none;
  border-radius: 8px;
  padding: 8px 10px;
  background: linear-gradient(120deg, #1d4ed8, #2563eb);
  color: #ffffff;
  font-weight: 700;
  cursor: pointer;
}

#matchDuty:hover {
  filter: brightness(1.05);
}

.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.stat-box {
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: #f8fafc;
  padding: 8px;
}

.stat-box strong {
  display: block;
  color: #475569;
  font-size: 0.74rem;
  text-transform: uppercase;
}

.stat-box span {
  font-family: "Consolas", "Courier New", monospace;
  font-size: 0.98rem;
  font-weight: 800;
}

.visuals {
  display: grid;
  gap: 12px;
}

.chart {
  background: #ffffff;
  border: 1px solid #dbeafe;
  border-radius: var(--radius-sm);
  padding: 10px;
}

.chart h2 {
  margin: 0 0 8px;
  font-size: 1rem;
}

canvas {
  width: 100%;
  height: 210px;
  background: linear-gradient(180deg, #ffffff, #eef4ff);
  border-radius: 8px;
  display: block;
}

.legend {
  margin-top: 6px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  color: #475569;
  font-size: 0.82rem;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.swatch {
  width: 12px;
  height: 3px;
  border-radius: 2px;
}

.swatch-pwm {
  background: var(--pulse);
}

.swatch-avg {
  background: var(--avg);
}

.swatch-target {
  background: var(--target);
}

.load-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.load-card {
  background: #ffffff;
  border: 1px solid #dbeafe;
  border-radius: var(--radius-sm);
  padding: 10px;
}

.load-card h3 {
  margin: 0 0 10px;
  font-size: 0.95rem;
}

.led-stage,
.motor-stage {
  min-height: 180px;
  border-radius: 10px;
  background: linear-gradient(180deg, #e2e8f0, #cbd5e1);
  display: grid;
  place-items: center;
  position: relative;
}

.led-bulb {
  width: 78px;
  height: 78px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fff6bf 4%, #facc15 32%, #ca8a04 90%);
  box-shadow: 0 0 10px rgba(250, 204, 21, 0.4);
}

.led-label,
.motor-label {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.86rem;
  color: #0f172a;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.78);
  border-radius: 6px;
  padding: 2px 8px;
}

.motor-ring {
  width: 126px;
  height: 126px;
  border-radius: 50%;
  border: 6px solid #475569;
  display: grid;
  place-items: center;
  background: #f8fafc;
}

.motor-rotor {
  width: 94px;
  height: 94px;
  border-radius: 50%;
  position: relative;
}

.motor-rotor span {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 16px;
  height: 40px;
  border-radius: 8px;
  background: linear-gradient(180deg, #3b82f6, #1d4ed8);
  transform-origin: center -8px;
}

.motor-rotor span:nth-child(1) {
  transform: translate(-50%, -50%) rotate(0deg);
}

.motor-rotor span:nth-child(2) {
  transform: translate(-50%, -50%) rotate(90deg);
}

.motor-rotor span:nth-child(3) {
  transform: translate(-50%, -50%) rotate(180deg);
}

.motor-rotor span:nth-child(4) {
  transform: translate(-50%, -50%) rotate(270deg);
}

.explain h2 {
  margin: 0 0 8px;
}

.sankey-panel h2 {
  margin: 0 0 4px;
}

.sankey-panel {
  margin-top: 0;
}

.sankey-subtitle {
  margin: 0 0 10px;
  color: #475569;
  font-size: 0.92rem;
}

#sankeySvg {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  background: linear-gradient(180deg, #ffffff, #f8fbff);
  border: 1px solid #dbeafe;
}

.node {
  stroke-width: 1.4;
}

.node-input {
  fill: #e0ecff;
  stroke: #1d4ed8;
}

.node-useful {
  fill: #dcfce7;
  stroke: #16a34a;
}

.node-switch {
  fill: #ffedd5;
  stroke: #ea580c;
}

.node-heat {
  fill: #fee2e2;
  stroke: #dc2626;
}

.node-title {
  font-size: 18px;
  font-weight: 700;
  fill: #0f172a;
}

.node-value {
  font-size: 16px;
  font-weight: 700;
  fill: #334155;
}

.flow {
  fill: none;
  stroke-linecap: round;
  opacity: 0.78;
  transition: stroke-width 240ms ease;
}

.flow.useful {
  stroke: #22c55e;
}

.flow.switch {
  stroke: #f97316;
}

.flow.heat {
  stroke: #ef4444;
}

.sankey-meta {
  margin-top: 8px;
  color: #475569;
  font-size: 0.88rem;
}

.explain p,
.explain ol {
  margin: 0 0 10px;
  color: #0f172a;
}

.explain .mini {
  color: #334155;
}

@media (max-width: 980px) {
  .app-grid {
    grid-template-columns: 1fr;
  }

  .controls {
    position: static;
    top: auto;
  }

  .stats {
    grid-template-columns: 1fr;
  }
}