/* ============ Electric Field — instrument-specific styles ============ */

.palette {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 10px;
  margin: 4px 0 2px;
  background: linear-gradient(160deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  flex-wrap: wrap;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
}
.pal-btn {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--mut);
  background: transparent;
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 8px;
  padding: 5px 11px;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.pal-btn:hover { color: var(--txt); border-color: var(--line-strong); background: rgba(255,255,255,0.05); transform: translateY(-1px); }
.pal-btn:active { transform: translateY(0) scale(0.97); }
.pal-btn.active {
  color: var(--acc);
  border-color: rgba(103,232,249,0.4);
  background: rgba(103,232,249,0.1);
  box-shadow: 0 0 12px -2px rgba(103,232,249,0.15);
}
.pal-sep {
  width: 1px; height: 20px;
  background: rgba(255,255,255,0.08);
  margin: 0 3px;
  flex-shrink: 0;
}
.pal-warn { color: var(--err); }
.pal-warn:hover { color: var(--err); background: rgba(251,113,133,0.1); border-color: rgba(251,113,133,0.35); }

#fieldSvg { cursor: crosshair; }

.gdot { fill: rgba(255,255,255,0.05); }

/* Field lines */
.field-line {
  fill: none;
  stroke: rgba(103,232,249,0.3);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 0 2px rgba(103,232,249,0.15));
}

/* Charges */
.charge-body {
  stroke-width: 1.8;
  transition: stroke-width 0.15s;
}
.charge-pos .charge-body { fill: rgba(239,68,68,0.18); stroke: #ef4444; }
.charge-neg .charge-body { fill: rgba(96,165,250,0.18); stroke: #60a5fa; }
.charge-pos { filter: drop-shadow(0 0 8px rgba(239,68,68,0.25)); }
.charge-neg { filter: drop-shadow(0 0 8px rgba(96,165,250,0.25)); }
.charge-sign {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  text-anchor: middle;
  pointer-events: none;
}
.charge-pos .charge-sign { fill: #ef4444; }
.charge-neg .charge-sign { fill: #60a5fa; }
.charge-label {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: rgba(255,255,255,0.5);
  text-anchor: middle;
  pointer-events: none;
}
.charge-sel .charge-body {
  stroke-dasharray: 4 3;
  stroke-width: 2.2;
}
.charge-sel { animation: charge-pulse 1.5s ease-in-out infinite; }
@keyframes charge-pulse { 0%, 100% { filter: drop-shadow(0 0 8px rgba(103,232,249,0.3)); } 50% { filter: drop-shadow(0 0 14px rgba(103,232,249,0.5)); } }

/* Info panel */
.charge-list {
  list-style: none;
  padding: 0;
}
.charge-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-size: 0.82rem;
}
.charge-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.charge-dot-pos { background: #ef4444; }
.charge-dot-neg { background: #60a5fa; }

.panel-sep {
  border: none;
  border-top: 1px solid rgba(255,255,255,0.06);
  margin: 0.75rem 0;
}

kbd {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 4px;
  padding: 1px 5px;
}