/* =========================
   Chart Visualization Components
   SVG-based realistic charts for MVP demo
   ========================= */

/* === CHART BASE === */
.chart {
  width: 100%;
  height: 100%;
  position: relative;
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
}

.chart__svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* === CHART GRID === */
.chart__grid-line {
  stroke: var(--color-divider);
  stroke-width: 1;
  stroke-dasharray: 2,2;
}

.chart__axis-line {
  stroke: var(--color-border);
  stroke-width: 1.5;
}

.chart__axis-text {
  font-family: var(--font-family);
  font-size: var(--font-size-chart-xs);
  fill: var(--color-text-tertiary);
  dominant-baseline: middle;
}

.chart__axis-label {
  font-family: var(--font-family);
  font-size: var(--font-size-chart-sm);
  font-weight: var(--font-weight-medium);
  fill: var(--color-text-secondary);
}

/* === CHART LINES === */
.chart__line {
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chart__line--voltage {
  stroke: var(--color-voltage);
}

.chart__line--current {
  stroke: var(--color-current);
}

.chart__line--power {
  stroke: var(--color-power);
}

.chart__line--millivolts {
  stroke: var(--color-millivolts);
}

/* === CHART AREAS === */
.chart__area {
  stroke: none;
  opacity: 0.1;
}

.chart__area--voltage {
  fill: var(--color-voltage);
}

.chart__area--current {
  fill: var(--color-current);
}

.chart__area--power {
  fill: var(--color-power);
}

.chart__area--millivolts {
  fill: var(--color-millivolts);
}

/* === CHART POINTS === */
.chart__point {
  r: 3;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.chart__point--voltage {
  fill: var(--color-voltage);
}

.chart__point--current {
  fill: var(--color-current);
}

.chart__point--power {
  fill: var(--color-power);
}

.chart__point--millivolts {
  fill: var(--color-millivolts);
}

.chart:hover .chart__point {
  opacity: 1;
}

/* === CHART TOOLTIP === */
.chart__tooltip {
  position: absolute;
  background-color: var(--color-text-primary);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: 10;
  box-shadow: var(--shadow-lg);
  display: block; /* visible element; opacity controls visibility */
}

.chart__tooltip--visible {
  opacity: 1;
  display: block;
}

/* === CHART CURSOR TIME === */
.chart-cursor-time {
  font-family: var(--font-family);
  font-size: 12px;
  font-weight: var(--font-weight-medium);
  fill: var(--color-text-secondary);
  text-anchor: middle;
  user-select: none;
  pointer-events: none;
}

/* === CHART LEGEND === */
.chart__legend {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  margin-top: var(--space-3);
  flex-wrap: wrap;
}

.chart__legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-chart-sm);
  color: var(--color-text-secondary);
}

.chart__legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.chart__legend-dot--voltage {
  background-color: var(--color-voltage);
}

.chart__legend-dot--current {
  background-color: var(--color-current);
}

.chart__legend-dot--power {
  background-color: var(--color-power);
}

.chart__legend-dot--millivolts {
  background-color: var(--color-millivolts);
}

/* === CHART CONTAINER === */
.chart-wrapper {
  position: relative;
  width: 100%;
  height: 500px;
  overflow: hidden;
  padding: var(--space-2);
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-4);
}

.chart-wrapper--loading {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface-hover);
}

/* === CHART STATISTICS OVERLAY === */
.chart__stats {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background-color: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
}

/* Horizontal statistics layout */
.chart__stats--horizontal {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  font-size: 12px;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}

.chart__stats-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-1);
  font-size: var(--font-size-sm);
}

.chart__stats--horizontal .chart__stats-item {
  display: inline-flex;
  gap: 4px;
  margin-bottom: 0;
  font-size: 12px;
}

.chart__stats-item:last-child {
  margin-bottom: 0;
}

.chart__stats-divider {
  color: var(--color-text-tertiary);
  font-weight: bold;
  margin: 0 4px;
}

.chart__stats-label {
  color: var(--color-text-tertiary);
}

.chart__stats-value {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

/* === COMBINED CHART STYLES === */
.chart--combined .chart__line {
  stroke-width: 1.2;
  opacity: 0.8;
}

.chart--combined .chart__legend {
  background-color: var(--color-surface);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

/* === MIN/MAX CHART STYLES === */
.chart--minmax .chart__bar {
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.chart--minmax .chart__bar:hover {
  opacity: 1;
}

.chart__bar--voltage {
  fill: var(--color-voltage);
}

.chart__bar--current {
  fill: var(--color-current);
}

.chart__bar--power {
  fill: var(--color-power);
}

.chart__bar--millivolts {
  fill: var(--color-millivolts);
}

/* === ZOOM MODE === */
.chart--zoom-mode .chart__line {
  stroke: #808080 !important;
}

.chart--zoom-mode .chart__area {
  fill: #808080 !important;
  opacity: 0.3 !important;
}

/* === RESPONSIVE CHART === */
@media (max-width: 768px) {
  .chart-wrapper {
    height: 100%;
    min-height: 400px;
    padding: var(--space-2);
  }
  
  .chart__legend {
    gap: var(--space-2);
  }
  
  .chart__legend-item {
    font-size: var(--font-size-xs);
  }
  
  .chart__stats {
    position: static;
    margin-top: var(--space-2);
    padding: var(--space-2);
  }
}