/* Signal Chain Interactive — centered tree variant
   Namespaced: only activates when .signal-chain--active is present */

/* Clickable affordance */
.signal-bus-node,
.signal-fork-path,
.signal-rec-mode {
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
}

/* Smooth transitions on all interactive elements */
.signal-bus-node,
.signal-bus-bar,
.signal-stage,
.signal-stage::before,
.signal-stage::after,
.signal-stage-cond,
.signal-stage-cond::before,
.signal-stage-cond::after,
.signal-fork,
.signal-fork::before,
.signal-fork::after,
.signal-fork > .signal-id,
.signal-fork > .signal-id::after,
.signal-fork-paths::before,
.signal-fork-paths::after,
.signal-fork-path,
.signal-fork-path::before,
.signal-fork-path::after,
.signal-split,
.signal-split::before,
.signal-split::after,
.signal-split > .signal-id,
.signal-split > .signal-id::after,
.signal-split-paths::before,
.signal-split-path,
.signal-split-path::before,
.signal-rec-modes::before,
.signal-rec-toggle::after,
.signal-rec-outs::before,
.signal-rec-out,
.signal-rec-out::before {
  transition: opacity 0.2s ease, background 0.2s ease,
              border-color 0.2s ease, box-shadow 0.2s ease,
              border-style 0.2s ease, color 0.2s ease;
}

@keyframes signal-flow-right {
  from { background-position: 0 0; }
  to { background-position: 14px 0; }
}

@keyframes signal-flow-left {
  from { background-position: 0 0; }
  to { background-position: -14px 0; }
}

@keyframes signal-flow-down {
  from { background-position: 0 0; }
  to { background-position: 0 14px; }
}

@keyframes signal-pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* --- Dim inactive elements --- */

.signal-chain--active .signal-bus-node:not(.signal-active) {
  opacity: 0.25;
}

.signal-chain--active .signal-stage:not(.signal-active) {
  opacity: 0.25;
}

.signal-chain--active .signal-fork-path:not(.signal-active) {
  opacity: 0.12;
  border-style: dashed;
}

.signal-chain--active .signal-fork-path:not(.signal-active)::before,
.signal-chain--active .signal-fork-path:not(.signal-active)::after {
  background: transparent;
}

.signal-chain--active .signal-split-path:not(.signal-active) {
  opacity: 0.25;
}

/* --- Active element styles --- */

/* Selected bus node: accent background + glow */
.signal-chain--active .signal-bus-node.signal-active {
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  border-color: var(--accent);
  box-shadow: 0 0 10px color-mix(in srgb, var(--accent) 25%, transparent);
}

/* Active stage boxes: brighter border + subtle shadow */
.signal-chain--active .signal-stage.signal-active {
  border-color: var(--accent);
  box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 15%, transparent);
}

/* Connector rail brightening handled by per-node animation rules below */

/* Animated vertical rails for active path */
.signal-chain--active .signal-bus::after,
.signal-chain--active .signal-node-eq::after,
.signal-chain--active .signal-node-select::after,
.signal-chain--active .signal-node-rec::after,
.signal-chain--active .signal-node-vol::after,
.signal-chain--active .signal-node-mode::after,
.signal-chain--active .signal-node-path::before,
.signal-chain--active .signal-node-path::after,
.signal-chain--active .signal-node-amp::after,
.signal-chain--active .signal-node-prot::after,
.signal-chain--active .signal-node-relay::after,
.signal-chain--active .signal-node-out::before {
  background: repeating-linear-gradient(
    180deg,
    color-mix(in srgb, var(--accent) 75%, transparent) 0 7px,
    color-mix(in srgb, var(--accent) 30%, transparent) 7px 14px
  );
  background-size: 2px 14px;
  animation: signal-flow-down 0.9s linear infinite;
}

/* Fork/split internal vertical legs */
.signal-chain--active .signal-fork-path::before,
.signal-chain--active .signal-fork-path::after,
.signal-chain--active .signal-split-path::before {
  background: repeating-linear-gradient(
    180deg,
    color-mix(in srgb, var(--accent) 75%, transparent) 0 7px,
    color-mix(in srgb, var(--accent) 30%, transparent) 7px 14px
  );
  background-size: 2px 14px;
  animation: signal-flow-down 0.9s linear infinite;
}

/* Fork/split horizontal bars + REC branch — pulse */
.signal-chain--active .signal-fork-paths::before,
.signal-chain--active .signal-fork-paths::after,
.signal-chain--active .signal-split-paths::before,
.signal-chain--active .signal-stage-rec.signal-rec-output-active .signal-rec-modes::before,
.signal-chain--active .signal-stage-rec.signal-rec-output-active .signal-rec-toggle::after,
.signal-chain--active .signal-stage-rec.signal-rec-output-active .signal-rec-outs::before,
.signal-chain--active .signal-rec-out.signal-active::before {
  animation: signal-pulse 1.1s ease-in-out infinite;
}

/* Active fork label glow */
.signal-chain--active .signal-fork.signal-active > .signal-id {
  border-color: var(--accent);
  box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 15%, transparent);
}
.signal-chain--active .signal-fork.signal-active > .signal-id::after {
  background: color-mix(in srgb, var(--accent) 50%, transparent);
}

/* Active fork horizontal bars brighten */
.signal-chain--active .signal-fork.signal-active .signal-fork-paths::before,
.signal-chain--active .signal-fork.signal-active .signal-fork-paths::after {
  background: color-mix(in srgb, var(--accent) 50%, transparent);
}

/* Active fork path: solid, bright */
.signal-chain--active .signal-fork-path.signal-active {
  border-color: var(--accent);
  border-style: solid;
  box-shadow: 0 0 6px color-mix(in srgb, var(--accent) 15%, transparent);
}

.signal-chain--active .signal-fork-path.signal-active::before,
.signal-chain--active .signal-fork-path.signal-active::after {
  background: color-mix(in srgb, var(--accent) 50%, transparent);
}

/* Active fork pad glow */
.signal-chain--active .signal-fork-path.signal-active .signal-fork-pad {
  background: var(--accent);
  box-shadow: 0 0 4px color-mix(in srgb, var(--accent) 40%, transparent);
}

/* Conditional stage (EQ): dashed → solid when active */
.signal-chain--active .signal-stage-cond.signal-active {
  border-style: solid;
  border-color: var(--accent);
  box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 15%, transparent);
}

.signal-chain--active .signal-stage-cond.signal-active .signal-id {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  border-color: color-mix(in srgb, var(--accent) 15%, transparent);
}

.signal-chain--active .signal-stage-cond.signal-active .signal-name {
  color: var(--text-primary);
  font-weight: 600;
}

/* EQ connector handled by the per-node animation rules */

/* --- Recording mode toggle --- */

/* Rec modes transition */
.signal-rec-mode {
  transition: opacity 0.2s ease, background 0.2s ease,
              border-color 0.2s ease, box-shadow 0.2s ease,
              color 0.2s ease;
}

/* Dim unselected rec modes when chain is active */
.signal-chain--active .signal-rec-mode:not(.signal-active) {
  opacity: 0.3;
}

/* Preserve selected REC choice even when no input is currently selected */
.signal-rec-mode.signal-active {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 65%, transparent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

/* Active rec mode: accent highlight */
.signal-chain--active .signal-rec-mode.signal-active {
  color: var(--accent);
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  box-shadow: 0 0 6px color-mix(in srgb, var(--accent) 15%, transparent);
}

/* REC OUT branch rails brighten only when a non-off output is selected */
.signal-chain--active .signal-stage-rec.signal-rec-output-active .signal-rec-modes::before {
  border-top-color: color-mix(in srgb, var(--accent) 50%, transparent);
  border-top-style: solid;
}

.signal-chain--active .signal-stage-rec.signal-rec-output-active .signal-rec-toggle::after,
.signal-chain--active .signal-stage-rec.signal-rec-output-active .signal-rec-outs::before {
  background: color-mix(in srgb, var(--accent) 50%, transparent);
}

.signal-chain--active .signal-rec-out:not(.signal-active) {
  opacity: 0.28;
  border-style: dashed;
}

.signal-chain--active .signal-rec-out:not(.signal-active)::before {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.signal-chain--active .signal-rec-out.signal-active {
  border-color: var(--accent);
  border-style: solid;
  box-shadow: 0 0 6px color-mix(in srgb, var(--accent) 15%, transparent);
}

.signal-chain--active .signal-rec-out.signal-active::before {
  background: color-mix(in srgb, var(--accent) 50%, transparent);
}

/* Active split paths */
.signal-chain--active .signal-split-path.signal-active {
  border-color: var(--accent);
  box-shadow: 0 0 6px color-mix(in srgb, var(--accent) 15%, transparent);
}

.signal-chain--active .signal-split-path.signal-active::before {
  background: color-mix(in srgb, var(--accent) 50%, transparent);
}

.signal-chain--active .signal-split-path.signal-active .signal-split-pad {
  background: var(--accent);
  box-shadow: 0 0 4px color-mix(in srgb, var(--accent) 40%, transparent);
}

/* Active split label + rails */
.signal-chain--active .signal-split.signal-active > .signal-id {
  border-color: var(--accent);
  box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 15%, transparent);
}

/* Split horizontal bar brightens when active */
.signal-chain--active .signal-split.signal-active .signal-split-paths::before {
  background: color-mix(in srgb, var(--accent) 50%, transparent);
}

/* --- Source indicator (always visible, even when chain is disabled/off) --- */
.signal-bus-node.signal-source {
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  box-shadow: 0 0 6px color-mix(in srgb, var(--accent) 12%, transparent);
}

/* --- Disabled state (power off) --- */
.signal-chain--disabled {
  pointer-events: none;
  transition: opacity 0.3s;
}

.signal-chain--disabled > *:not(.signal-bus) {
  opacity: 0.4;
}

.signal-chain--disabled > .signal-bus .signal-bus-node:not(.signal-source) {
  opacity: 0.4;
}

.signal-chain--disabled > .signal-bus-bar {
  opacity: 0.4;
}

/* --- Passive mode (no interactive cursors) --- */
.signal-chain--passive .signal-bus-node,
.signal-chain--passive .signal-fork-path,
.signal-chain--passive .signal-rec-mode {
  cursor: default;
  user-select: auto;
  -webkit-user-select: auto;
}

@media (prefers-reduced-motion: reduce) {
  .signal-chain--active .signal-bus::after,
  .signal-chain--active .signal-node-eq::after,
  .signal-chain--active .signal-node-select::after,
  .signal-chain--active .signal-node-rec::after,
  .signal-chain--active .signal-node-vol::after,
  .signal-chain--active .signal-node-mode::after,
  .signal-chain--active .signal-node-path::before,
  .signal-chain--active .signal-node-path::after,
  .signal-chain--active .signal-node-amp::after,
  .signal-chain--active .signal-node-prot::after,
  .signal-chain--active .signal-node-relay::after,
  .signal-chain--active .signal-node-out::before,
  .signal-chain--active .signal-fork-path::before,
  .signal-chain--active .signal-fork-path::after,
  .signal-chain--active .signal-split-path::before,
  .signal-chain--active .signal-fork-paths::before,
  .signal-chain--active .signal-fork-paths::after,
  .signal-chain--active .signal-split-paths::before,
  .signal-chain--active .signal-stage-rec.signal-rec-output-active .signal-rec-modes::before,
  .signal-chain--active .signal-stage-rec.signal-rec-output-active .signal-rec-toggle::after,
  .signal-chain--active .signal-stage-rec.signal-rec-output-active .signal-rec-outs::before,
  .signal-chain--active .signal-rec-out.signal-active::before {
    animation: none !important;
  }
}

/* --- Horizontal mode animation overrides --- */
@media (min-width: 681px) {
  /* Row 1 horizontal connectors → signal-flow-right */
  .signal-chain--horizontal.signal-chain--active .signal-node-eq::after,
  .signal-chain--horizontal.signal-chain--active .signal-node-select::after,
  .signal-chain--horizontal.signal-chain--active .signal-node-rec::after,
  .signal-chain--horizontal.signal-chain--active .signal-node-vol::after {
    background: repeating-linear-gradient(
      90deg,
      color-mix(in srgb, var(--accent) 75%, transparent) 0 7px,
      color-mix(in srgb, var(--accent) 30%, transparent) 7px 14px
    );
    background-size: 14px 2px;
    animation: signal-flow-right 0.9s linear infinite;
  }

  /* Row 2 horizontal connectors → signal-flow-left */
  .signal-chain--horizontal.signal-chain--active .signal-node-path::after,
  .signal-chain--horizontal.signal-chain--active .signal-node-amp::after,
  .signal-chain--horizontal.signal-chain--active .signal-node-prot::after,
  .signal-chain--horizontal.signal-chain--active .signal-node-relay::after {
    background: repeating-linear-gradient(
      -90deg,
      color-mix(in srgb, var(--accent) 75%, transparent) 0 7px,
      color-mix(in srgb, var(--accent) 30%, transparent) 7px 14px
    );
    background-size: 14px 2px;
    animation: signal-flow-left 0.9s linear infinite;
  }

  /* Fork/split internal legs → horizontal */
  .signal-chain--horizontal.signal-chain--active .signal-fork-path::before,
  .signal-chain--horizontal.signal-chain--active .signal-fork-path::after,
  .signal-chain--horizontal.signal-chain--active .signal-split-path::before {
    background: repeating-linear-gradient(
      90deg,
      color-mix(in srgb, var(--accent) 75%, transparent) 0 7px,
      color-mix(in srgb, var(--accent) 30%, transparent) 7px 14px
    );
    background-size: 14px 2px;
    animation: signal-flow-right 0.9s linear infinite;
  }
}