/**
 * Energy Dashboards Flow Diagram CSS
 * SVG energy flow animation keyframes and styles
 */

/* ── Flow diagram container ──────────────────────────────────────────────── */
.flow-diagram {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  position: relative;
}

.flow-diagram svg {
  width: 100%;
  height: auto;
  display: block;
}

/* ── Node styles ─────────────────────────────────────────────────────────── */
.flow-node__bg {
  fill: var(--bg-elevated);
  stroke: var(--bg-border);
  stroke-width: 1;
  transition: stroke 0.3s ease;
}

.flow-node__bg--hub {
  fill: var(--bg-elevated);
  stroke: var(--green-dim);
  stroke-width: 1.5;
}

.flow-node__bg--active {
  stroke: var(--green-bright);
  filter: url(#glow-green);
}

.flow-node__icon {
  fill: var(--text-secondary);
}

.flow-node__icon--solar   { fill: var(--solar); }
.flow-node__icon--battery { fill: var(--battery-charge); }
.flow-node__icon--grid    { fill: var(--grid-import); }
.flow-node__icon--ev      { fill: var(--ev); }
.flow-node__icon--boiler  { fill: var(--heating); }

.flow-node__label {
  font-family: 'DM Sans', sans-serif;
  font-size: 11px;
  fill: var(--text-secondary);
  text-anchor: middle;
}

.flow-node__label--hub {
  font-family: 'Syne', sans-serif;
  font-size: 13px;
  font-weight: 700;
  fill: var(--text-primary);
}

.flow-node__value {
  font-family: 'Azeret Mono', monospace;
  font-size: 12px;
  font-weight: 500;
  fill: var(--readout);
  text-anchor: middle;
}

.flow-node__value--solar   { fill: var(--solar); }
.flow-node__value--battery { fill: var(--battery-charge); }
.flow-node__value--grid-import { fill: var(--grid-import); }
.flow-node__value--grid-export { fill: var(--grid-export); }
.flow-node__value--ev      { fill: var(--ev); }
.flow-node__value--boiler  { fill: var(--heating); }

/* ── Edge (flow path) styles ─────────────────────────────────────────────── */
.flow-edge {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke-width 0.4s ease, stroke 0.3s ease, opacity 0.3s ease;
}

.flow-edge--solar    { stroke: var(--solar); }
.flow-edge--battery-charge { stroke: var(--battery-charge); }
.flow-edge--battery-drain  { stroke: var(--battery-drain); }
.flow-edge--grid-import    { stroke: var(--grid-import); }
.flow-edge--grid-export    { stroke: var(--grid-export); }
.flow-edge--ev       { stroke: var(--ev); }
.flow-edge--boiler   { stroke: var(--heating); }
.flow-edge--consumption { stroke: var(--consumption); }
.flow-edge--hub      { stroke: var(--green-bright); }

/* Zero-value edges are dimmed */
.flow-edge--zero {
  stroke: var(--bg-border);
  opacity: 0.5;
}

/* ── Animated dash flow ──────────────────────────────────────────────────── */
/* Direction: forward (positive kW) */
.flow-edge--forward {
  stroke-dasharray: 8 12;
  animation: flow-forward var(--flow-duration, 2s) linear infinite;
}

/* Direction: reverse (negative kW — e.g. grid export) */
.flow-edge--reverse {
  stroke-dasharray: 8 12;
  animation: flow-reverse var(--flow-duration, 2s) linear infinite;
}

/* Paused (zero kW) */
.flow-edge--paused {
  stroke-dasharray: 4 16;
  opacity: 0.4;
  animation: none;
}

@keyframes flow-forward {
  from { stroke-dashoffset: 20; }
  to   { stroke-dashoffset: 0; }
}

@keyframes flow-reverse {
  from { stroke-dashoffset: 0; }
  to   { stroke-dashoffset: 20; }
}

/* ── SVG filters ─────────────────────────────────────────────────────────── */
/* Applied to active nodes and generating edges */
.glow-green {
  filter: drop-shadow(0 0 6px rgba(0, 232, 122, 0.6));
}

.glow-solar {
  filter: drop-shadow(0 0 6px rgba(240, 192, 64, 0.6));
}

/* ── Flow diagram loading state ──────────────────────────────────────────── */
.flow-diagram--loading {
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.flow-diagram--loading .flow-node__bg {
  fill: var(--bg-elevated);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* ── Mobile compact flow ─────────────────────────────────────────────────── */
.flow-compact {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
}

.flow-compact__source,
.flow-compact__sink {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.flow-compact__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8125rem;
}

.flow-compact__kw {
  font-family: var(--font-data);
  font-size: 0.875rem;
  color: var(--readout);
}

.flow-compact__hub {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--bg-elevated);
  border: 1px solid var(--green-dim);
  border-radius: var(--radius-lg);
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-align: center;
}

.flow-compact__arrows {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  color: var(--text-dim);
  font-size: 1rem;
}