:root {
  --bg: #0d1117;
  --panel: #151b23;
  --panel-2: #1c2430;
  --border: #2a3341;
  --text: #e6edf3;
  --text-dim: #9aa7b4;
  --accent: #5ec8f8;
  --accent-2: #ffb454;
  --warn: #ff6b6b;
  --good: #56d364;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
}

header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

header h1 {
  font-size: 18px;
  margin: 0;
  font-weight: 600;
  letter-spacing: 0.2px;
}

header .subtitle {
  color: var(--text-dim);
  font-size: 12.5px;
}

.layout {
  display: grid;
  grid-template-columns: 360px 1fr 340px;
  gap: 1px;
  background: var(--border);
  min-height: calc(100vh - 54px);
}

.panel {
  background: var(--bg);
  overflow-y: auto;
  max-height: calc(100vh - 54px);
}

.panel-inner { padding: 16px; }

.center-panel {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
}

.schematic-wrap {
  background: var(--bg);
  padding: 10px;
}

.chart-wrap {
  background: var(--bg);
  padding: 10px;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin: 0 0 14px 0;
  padding: 10px 12px 12px;
}

legend {
  padding: 0 6px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.field {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 6px 10px;
  margin-bottom: 8px;
}

.field label {
  font-size: 12.5px;
  color: var(--text-dim);
}

.field input[type="number"], .field select {
  width: 92px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 5px;
  padding: 3px 6px;
  font-family: var(--mono);
  font-size: 12.5px;
}

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

.field.checkbox {
  grid-template-columns: auto 1fr;
}

.hint {
  grid-column: 1 / -1;
  color: var(--text-dim);
  font-size: 11px;
  margin-top: -4px;
}

select#preset-select, select#unit-select {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 5px;
  padding: 4px 8px;
  font-size: 12.5px;
}

.result-block {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 12px;
}

.result-block h3 {
  margin: 0 0 8px 0;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
  font-weight: 600;
}

.headline {
  text-align: center;
  padding: 18px 10px 20px;
}

.headline .value {
  font-size: 46px;
  font-weight: 700;
  color: var(--accent-2);
  font-family: var(--mono);
  line-height: 1.1;
}

.headline .value small { font-size: 20px; color: var(--text-dim); font-weight: 500; }

.headline .label {
  margin-top: 6px;
  color: var(--text-dim);
  font-size: 12.5px;
}

.kv-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  row-gap: 5px;
  column-gap: 10px;
  font-size: 12.5px;
}

.kv-grid .k { color: var(--text-dim); }
.kv-grid .v { font-family: var(--mono); text-align: right; }
.kv-grid .v.good { color: var(--good); }
.kv-grid .v.warn { color: var(--warn); }

.warnings {
  margin-bottom: 12px;
}

.warning-item {
  background: rgba(255, 107, 107, 0.1);
  border: 1px solid rgba(255, 107, 107, 0.4);
  color: #ffb3b3;
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 12px;
  margin-bottom: 6px;
  line-height: 1.4;
}

.topology-note {
  color: var(--text-dim);
  font-size: 11.5px;
  line-height: 1.5;
  margin: 4px 6px 0;
}

.tune-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 6px;
}

.tune-row select {
  flex: 1;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 5px;
  padding: 4px 6px;
  font-size: 12px;
}

button.tune-btn {
  background: var(--accent);
  border: none;
  color: #06202c;
  font-weight: 600;
  border-radius: 5px;
  padding: 5px 12px;
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
}
button.tune-btn:hover { filter: brightness(1.1); }

svg text { fill: var(--text); font-family: var(--mono); }
svg .comp-label { fill: var(--accent); font-size: 11px; }
svg .comp-value { fill: var(--text-dim); font-size: 10px; }
svg .wire { stroke: var(--text-dim); stroke-width: 2; fill: none; }
svg .ground-hatch { stroke: var(--text-dim); stroke-width: 1.5; }
svg .spark { stroke: var(--accent-2); stroke-width: 2; fill: none; }

button.link-btn {
  background: none;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 5px;
  padding: 3px 8px;
  font-size: 11px;
  cursor: pointer;
}
button.link-btn:hover { background: rgba(94, 200, 248, 0.12); }

footer.note {
  padding: 10px 20px 20px;
  color: var(--text-dim);
  font-size: 11px;
  line-height: 1.5;
}

@media (max-width: 1100px) {
  .layout { grid-template-columns: 1fr; }
  .panel, .center-panel { max-height: none; }
}