:root {
  color-scheme: dark;
  --bg: #111716;
  --panel: #17211f;
  --panel-2: #202a27;
  --panel-3: #101615;
  --text: #ecf5ed;
  --muted: #aab9b0;
  --line: #34433e;
  --accent: #57dc94;
  --solar: #f2c15d;
  --thermal: #fa886f;
  --kinetic: #6fc7ff;
  --reserve: #b9a7ff;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  overflow-x: hidden;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 356px;
  min-height: 100vh;
}

.stage-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 26px;
}

.topbar,
.panel-head,
.chart-row,
.sim-grid,
.mode-group,
.metric,
.source-row {
  display: flex;
}

.topbar {
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  max-width: 830px;
  font-size: clamp(2.25rem, 4.6vw, 4.9rem);
  line-height: 0.95;
  letter-spacing: 0;
}

h2 {
  font-size: 1rem;
}

h3 {
  color: var(--text);
  font-size: 0.8rem;
  letter-spacing: 0;
  text-transform: uppercase;
}

.lede {
  max-width: 700px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.45;
}

.mode-group {
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

button,
select {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--panel-2);
  color: var(--text);
  font: inherit;
  font-weight: 750;
}

button {
  cursor: pointer;
}

button:hover,
select:hover {
  border-color: var(--accent);
}

.preset {
  padding: 0 14px;
}

.preset.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #07130e;
}

.overview-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.metric {
  min-height: 84px;
  flex-direction: column;
  justify-content: space-between;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.metric.primary {
  border-color: rgba(87, 220, 148, 0.55);
}

.metric span,
label span,
.formula-box p,
.readout-panel span,
.source-row span {
  color: var(--muted);
  font-size: 0.86rem;
}

.metric strong,
.readout-panel strong,
.source-row strong {
  font-size: 1.35rem;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.sim-grid {
  min-height: 460px;
  gap: 18px;
  align-items: stretch;
}

#deviceCanvas {
  width: min(100%, 920px);
  flex: 1 1 auto;
  min-width: 0;
  min-height: 430px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-3);
}

.source-panel {
  display: grid;
  width: 250px;
  gap: 10px;
  align-content: start;
}

.source-row {
  min-height: 102px;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.bar {
  height: 7px;
  overflow: hidden;
  border-radius: 99px;
  background: #0d1211;
}

.bar i {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  transition: width 160ms ease;
}

.solar .bar i {
  background: var(--solar);
}

.thermal .bar i {
  background: var(--thermal);
}

.kinetic .bar i {
  background: var(--kinetic);
}

.reserve .bar i {
  background: var(--reserve);
}

.chart-row {
  gap: 18px;
  align-items: stretch;
}

.chart-row canvas {
  width: 34%;
  min-width: 0;
  height: 180px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.readout-panel {
  display: grid;
  width: 230px;
  gap: 10px;
}

.readout-panel div {
  display: flex;
  min-height: 52px;
  flex-direction: column;
  justify-content: space-between;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-height: 100vh;
  padding: 26px 22px;
  border-left: 1px solid var(--line);
  background: #151d1b;
}

.panel-head {
  align-items: center;
  justify-content: space-between;
}

#resetButton {
  width: 40px;
  padding: 0;
  font-size: 1.2rem;
}

.control-group {
  display: grid;
  gap: 14px;
}

label {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 14px;
}

select {
  grid-column: 1 / -1;
  width: 100%;
  padding: 0 10px;
}

output {
  color: var(--text);
  font-size: 0.86rem;
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--accent);
}

.formula-box {
  display: grid;
  gap: 12px;
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.formula-box code {
  display: block;
  overflow-x: auto;
  padding: 10px;
  border-radius: 6px;
  background: #0d1211;
  color: #dceee5;
  font-size: 0.78rem;
}

@media (max-width: 1180px) {
  .overview-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sim-grid,
  .chart-row {
    flex-direction: column;
    align-items: stretch;
  }

  .source-panel,
  .readout-panel {
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .chart-row canvas {
    width: 100%;
  }
}

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

  .control-panel {
    min-height: auto;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .topbar {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 560px) {
  .stage-panel,
  .control-panel {
    padding: 18px;
  }

  .overview-strip,
  .source-panel,
  .readout-panel {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 2.45rem;
  }
}