/* ===== PAGES/SIGNAL-CHAIN.CSS ===== */
/* Amplifier signal-chain diagrams. Article-specific and deliberately
   outside the kit: no other page draws a schematic. */

/* --- signal-chain.css --- */
/* ===== LAYOUTS/SIGNAL-CHAIN.CSS ===== */
/* Signal chain schematic diagram system - vertical, horizontal, and compact variants */

/* Base signal chain container */
.signal-chain {
    position: relative;
    width: min(100%, 760px);
    margin: 32px 0;
    padding: 30px 180px 30px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--connector-h);

    background-color: var(--bg-secondary);
    background-image:
        linear-gradient(color-mix(in srgb, var(--accent) 3%, transparent) 1px, transparent 1px),
        linear-gradient(90deg, color-mix(in srgb, var(--accent) 3%, transparent) 1px, transparent 1px);
    background-size: 16px 16px;
    border: 1px solid var(--border-color);
}

.signal-chain > * {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: var(--node-w);
}

.signal-chain > .signal-bus-bar {
    display: none;
}

.signal-chain > .signal-bus {
    width: 100%;
}

.signal-chain > .signal-node-path,
.signal-chain > .signal-node-out {
    width: auto;
}

/* Reset pseudo-elements */
.signal-chain > *::before,
.signal-chain > *::after {
    content: none;
}

/* Vertical connectors (downward between stages) */
.signal-chain > .signal-bus::after,
.signal-chain > .signal-node-eq::after,
.signal-chain > .signal-node-select::after,
.signal-chain > .signal-node-rec::after,
.signal-chain > .signal-node-vol::after,
.signal-chain > .signal-node-mode::after,
.signal-chain > .signal-node-amp::after,
.signal-chain > .signal-node-prot::after,
.signal-chain > .signal-node-relay::after {
    content: "";
    position: absolute;
    z-index: 0;
    top: 100%;
    left: 50%;
    width: 2px;
    height: var(--connector-h);
    background: var(--signal-rail);
    transform: translateX(-50%);
}

/* Fork: top center stem */
.signal-chain > .signal-node-path::before {
    content: "";
    position: absolute;
    z-index: 0;
    top: 0;
    left: 50%;
    width: 2px;
    height: var(--fork-leg);
    background: var(--signal-rail);
    transform: translateX(-50%);
}

/* Fork: bottom connector to AMP */
.signal-chain > .signal-node-path::after {
    content: "";
    position: absolute;
    z-index: 0;
    top: 100%;
    left: 50%;
    width: 2px;
    height: var(--connector-h);
    background: var(--signal-rail);
    transform: translateX(-50%);
}

/* Split: top center stem */
.signal-chain > .signal-node-out::before {
    content: "";
    position: absolute;
    z-index: 0;
    top: 0;
    left: 50%;
    width: 2px;
    height: var(--fork-leg);
    background: var(--signal-rail);
    transform: translateX(-50%);
}

/* Core node designs */
.signal-bus {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px;
}

.signal-bus-node {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 8px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 3px 5px;
    border: 1.5px solid color-mix(in srgb, var(--accent) 35%, transparent);
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 4%, transparent);
    border-radius: 2px;
    white-space: nowrap;
    box-sizing: border-box;
}

.signal-stage {
    padding: 6px 10px;
    border: 1.5px solid color-mix(in srgb, var(--accent) 30%, transparent);
    background: var(--bg-primary);
    border-radius: 3px;
    min-height: 52px;
    box-sizing: border-box;
    width: 100%;
}

.signal-id {
    font-size: 9px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    line-height: 1;
    padding: 3px 6px;
    background: color-mix(in srgb, var(--accent) 6%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 15%, transparent);
    display: inline-block;
}

.signal-name {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-primary);
    margin-top: 4px;
    line-height: 1.2;
    text-align: center;
}

.signal-desc {
    font-size: 8px;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-top: 2px;
}

.signal-ref {
    font-size: 8px;
    color: var(--text-muted);
    opacity: 0.7;
}

/* Conditional Stage */
.signal-stage-cond {
    border-style: dashed;
    border-color: color-mix(in srgb, var(--text-muted) 40%, transparent);
}

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

.signal-stage-cond .signal-name {
    color: var(--text-muted);
    font-weight: 400;
}

/* REC Stage Absolute Output Array */
.signal-stage-rec {
    overflow: visible;
}

.signal-rec-modes {
    position: absolute;
    top: 50%;
    left: 100%;
    margin-left: 20px;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    width: 140px;
    gap: 8px;
}

.signal-rec-modes::before {
    content: "";
    position: absolute;
    right: 100%;
    top: 50%;
    width: 20px;
    border-top: 1.5px dashed var(--signal-rail);
}

.signal-rec-toggle {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px;
}

.signal-rec-toggle::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    width: 2px;
    height: 12px;
    background: color-mix(in srgb, var(--accent) 25%, transparent);
    transform: translateX(-50%);
}

.signal-rec-mode {
    font-size: 7px;
    font-weight: 700;
    text-transform: uppercase;
    padding: 2px 5px;
    border: 1.5px solid color-mix(in srgb, var(--accent) 25%, transparent);
    color: var(--text-muted);
    background: var(--bg-primary);
    border-radius: 2px;
}

.signal-rec-outs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    width: 100%;
    padding-top: 12px;
    position: relative;
}

.signal-rec-outs::before {
    content: "";
    position: absolute;
    top: 0;
    left: 16%;
    right: 16%;
    height: 2px;
    background: color-mix(in srgb, var(--accent) 25%, transparent);
}

.signal-rec-out {
    font-size: 8px;
    font-weight: 600;
    text-transform: uppercase;
    padding: 4px 6px;
    border: 1.5px solid color-mix(in srgb, var(--accent) 25%, transparent);
    background: var(--bg-primary);
    border-radius: 3px;
    text-align: center;
    position: relative;
}

.signal-rec-out::before {
    content: "";
    position: absolute;
    bottom: 100%;
    left: 50%;
    width: 2px;
    height: 12px;
    background: color-mix(in srgb, var(--accent) 25%, transparent);
    transform: translateX(-50%);
}

/* Forks (PATH) - side-by-side with split/merge brackets */
.signal-fork {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0;
    border: none;
    background: none;
    padding-top: var(--fork-leg);
}

.signal-fork > .signal-id {
    display: none;
}

.signal-fork-paths {
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: var(--fork-gap);
    position: relative;
    padding: var(--fork-leg) 0;
}

/* Top split bar */
.signal-fork-paths::before {
    content: "";
    position: absolute;
    z-index: 0;
    top: 0;
    left: calc(var(--node-w) / 2);
    right: calc(var(--node-w) / 2);
    height: 2px;
    background: var(--signal-rail);
}

/* Bottom merge bar */
.signal-fork-paths::after {
    content: "";
    position: absolute;
    z-index: 0;
    bottom: 0;
    left: calc(var(--node-w) / 2);
    right: calc(var(--node-w) / 2);
    height: 2px;
    background: var(--signal-rail);
}

.signal-fork-path {
    width: var(--node-w);
    padding: 6px;
    border: 1.5px solid color-mix(in srgb, var(--accent) 30%, transparent);
    box-sizing: border-box;
    background: var(--bg-primary);
    border-radius: 3px;
    font-size: 8px;
    font-weight: 600;
    text-transform: uppercase;
    text-align: center;
    position: relative;
    z-index: 1;
}

/* Top leg: bar → path box */
.signal-fork-path::before {
    content: "";
    position: absolute;
    z-index: 0;
    bottom: 100%;
    left: 50%;
    width: 2px;
    height: var(--fork-leg);
    background: var(--signal-rail);
    transform: translateX(-50%);
}

/* Bottom leg: path box → merge bar */
.signal-fork-path::after {
    content: "";
    position: absolute;
    z-index: 0;
    top: 100%;
    left: 50%;
    width: 2px;
    height: var(--fork-leg);
    background: var(--signal-rail);
    transform: translateX(-50%);
}

.signal-fork-pad {
    display: inline-block;
    width: 4px;
    height: 4px;
    background: color-mix(in srgb, var(--accent) 50%, transparent);
    border-radius: 1px;
    margin-right: 4px;
    vertical-align: middle;
}

/* Splits (OUT) - fan-out with top bracket */
.signal-split {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0;
    border: none;
    background: none;
    padding-top: var(--fork-leg);
}

.signal-split > .signal-id {
    display: none;
}

.signal-split > .signal-ref {
    margin-top: 6px;
    text-align: center;
}

.signal-split-paths {
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: var(--split-gap);
    position: relative;
    padding-top: var(--fork-leg);
}

/* Top fan-out bar */
.signal-split-paths::before {
    content: "";
    position: absolute;
    z-index: 0;
    top: 0;
    left: 45px;
    right: 45px;
    height: 2px;
    background: var(--signal-rail);
}

.signal-split-path {
    width: 90px;
    padding: 6px;
    border: 1.5px solid color-mix(in srgb, var(--accent) 30%, transparent);
    box-sizing: border-box;
    background: var(--bg-primary);
    border-radius: 3px;
    font-size: 8px;
    font-weight: 600;
    text-transform: uppercase;
    text-align: center;
    position: relative;
    z-index: 1;
}

/* Top leg: bar → output box */
.signal-split-path::before {
    content: "";
    position: absolute;
    z-index: 0;
    bottom: 100%;
    left: 50%;
    width: 2px;
    height: var(--fork-leg);
    background: var(--signal-rail);
    transform: translateX(-50%);
}

.signal-split-pad {
    display: inline-block;
    width: 4px;
    height: 4px;
    background: color-mix(in srgb, var(--accent) 50%, transparent);
    border-radius: 50%;
    margin-right: 4px;
    vertical-align: middle;
}

/* --- signal-chain-compact.css --- */
/* ===== LAYOUTS/SIGNAL-CHAIN-COMPACT.CSS ===== */
/* Compact signal chain variant */

.signal-chain--compact {
    --connector-h: 16px;
    --node-w: 120px;
    --fork-gap: 14px;
    --fork-leg: 10px;
    padding: 20px 140px 20px 16px;
    margin: 20px 0;
}

.signal-chain--compact .signal-stage {
    padding: 5px 10px;
    min-height: 42px;
}

.signal-chain--compact .signal-bus-node {
    font-size: 8px;
    padding: 3px 5px;
}

.signal-chain--compact .signal-id {
    font-size: 9px;
    padding: 2px 5px;
}

.signal-chain--compact .signal-name {
    font-size: 10px;
    margin-top: 2px;
}

.signal-chain--compact .signal-desc {
    font-size: 8px;
}

.signal-chain--compact .signal-ref {
    font-size: 8px;
}

.signal-chain--compact .signal-fork-path {
    padding: 5px;
    font-size: 8px;
}

.signal-chain--compact .signal-split-path {
    width: 82px;
    padding: 5px;
    font-size: 8px;
}

.signal-chain--compact .signal-rec-modes {
    margin-left: 14px;
    width: 120px;
    gap: 6px;
}

.signal-chain--compact .signal-rec-modes::before {
    width: 14px;
}

.signal-chain--compact .signal-rec-mode {
    font-size: 7px;
    padding: 2px 4px;
}

.signal-chain--compact .signal-rec-out {
    font-size: 8px;
    padding: 3px 5px;
}

.signal-chain--compact .signal-rec-outs {
    padding-top: 10px;
}

/* --- signal-chain-horizontal.css --- */
/* ===== LAYOUTS/SIGNAL-CHAIN-HORIZONTAL.CSS ===== */
/* Horizontal signal chain variant (desktop only) */

@media (min-width: 681px) {
    .signal-chain--horizontal {
        display: grid;
        grid-template-columns: repeat(5, var(--node-w));
        column-gap: var(--connector-h);
        row-gap: var(--connector-h);
        justify-content: center;
        align-items: center;
        flex-direction: unset;
        padding-right: 20px;
    }

    /* Grid placement */
    .signal-chain--horizontal > .signal-bus {
        grid-row: 1;
        grid-column: 1 / -1;
    }
    .signal-chain--horizontal > .signal-bus-bar {
        display: none;
    }
    .signal-chain--horizontal > .signal-node-eq {
        grid-row: 2;
        grid-column: 1;
    }
    .signal-chain--horizontal > .signal-node-select {
        grid-row: 2;
        grid-column: 2;
    }
    .signal-chain--horizontal > .signal-node-rec {
        grid-row: 2;
        grid-column: 3;
        z-index: 2;
    }
    .signal-chain--horizontal > .signal-node-vol {
        grid-row: 2;
        grid-column: 4;
    }
    .signal-chain--horizontal > .signal-node-mode {
        grid-row: 2;
        grid-column: 5;
    }
    .signal-chain--horizontal > .signal-node-path {
        grid-row: 3;
        grid-column: 5;
    }
    .signal-chain--horizontal > .signal-node-amp {
        grid-row: 3;
        grid-column: 4;
    }
    .signal-chain--horizontal > .signal-node-prot {
        grid-row: 3;
        grid-column: 3;
    }
    .signal-chain--horizontal > .signal-node-relay {
        grid-row: 3;
        grid-column: 2;
    }
    .signal-chain--horizontal > .signal-node-out {
        grid-row: 3;
        grid-column: 1;
    }

    /* Direct children fill grid cells */
    .signal-chain--horizontal > * {
        width: 100%;
    }

    /* Connectors: Row 1 (horizontal, rightward) */
    .signal-chain--horizontal > .signal-node-eq::after,
    .signal-chain--horizontal > .signal-node-select::after,
    .signal-chain--horizontal > .signal-node-rec::after,
    .signal-chain--horizontal > .signal-node-vol::after {
        top: 50%;
        left: 100%;
        width: var(--connector-h);
        height: 2px;
        transform: translateY(-50%);
    }

    /* Bus connector: vertical down */
    .signal-chain--horizontal > .signal-bus::after {
        left: calc(var(--node-w) / 2);
        transform: none;
    }

    /* PATH incoming from MODE */
    .signal-chain--horizontal > .signal-node-path::before {
        content: none;
    }

    /* Connectors: Row 2 (horizontal, leftward) */
    .signal-chain--horizontal > .signal-node-path::after,
    .signal-chain--horizontal > .signal-node-amp::after,
    .signal-chain--horizontal > .signal-node-prot::after,
    .signal-chain--horizontal > .signal-node-relay::after {
        top: 50%;
        left: auto;
        right: 100%;
        width: var(--connector-h);
        height: 2px;
        transform: translateY(-50%);
    }

    /* OUT top stem: not needed in horizontal */
    .signal-chain--horizontal > .signal-node-out::before {
        content: none;
    }

    /* Fork (PATH) in horizontal mode */
    .signal-chain--horizontal .signal-fork {
        padding-top: 0;
    }

    .signal-chain--horizontal .signal-fork-paths {
        flex-direction: column;
        padding: 0 var(--fork-leg);
        width: 100%;
    }

    .signal-chain--horizontal .signal-fork-path {
        width: 100%;
    }

    /* Split bar → vertical on left */
    .signal-chain--horizontal .signal-fork-paths::before {
        left: 0;
        right: auto;
        bottom: 0;
        width: 2px;
        height: auto;
    }

    /* Merge bar → vertical on right */
    .signal-chain--horizontal .signal-fork-paths::after {
        top: 0;
        left: auto;
        right: 0;
        width: 2px;
        height: auto;
    }

    /* Fork path legs → horizontal */
    .signal-chain--horizontal .signal-fork-path::before {
        bottom: auto;
        left: auto;
        right: 100%;
        top: 50%;
        width: var(--fork-leg);
        height: 2px;
        transform: translateY(-50%);
    }

    .signal-chain--horizontal .signal-fork-path::after {
        top: 50%;
        left: 100%;
        width: var(--fork-leg);
        height: 2px;
        transform: translateY(-50%);
    }

    /* Split (OUT) in horizontal mode */
    .signal-chain--horizontal .signal-split {
        padding-top: 0;
    }

    .signal-chain--horizontal .signal-split-paths {
        flex-direction: column;
        padding-top: 0;
        padding-left: var(--fork-leg);
        width: 100%;
    }

    .signal-chain--horizontal .signal-split-path {
        width: 100%;
    }

    /* Fan-out bar → vertical on left */
    .signal-chain--horizontal .signal-split-paths::before {
        left: 0;
        right: auto;
        bottom: 0;
        width: 2px;
        height: auto;
    }

    /* Split path legs → horizontal */
    .signal-chain--horizontal .signal-split-path::before {
        bottom: auto;
        left: auto;
        right: 100%;
        top: 50%;
        width: var(--fork-leg);
        height: 2px;
        transform: translateY(-50%);
    }

    /* REC side-car repositioning */
    .signal-chain--horizontal .signal-rec-modes {
        top: 100%;
        left: 50%;
        transform: translateX(-50%);
        margin-top: 8px;
        margin-left: 0;
        width: max-content;
    }

    .signal-chain--horizontal .signal-rec-modes::before {
        right: auto;
        top: auto;
        bottom: 100%;
        left: 50%;
        width: 0;
        height: 8px;
        border-top: none;
        border-left: 1.5px dashed var(--signal-rail);
        transform: translateX(-50%);
    }

    /* Horizontal compact: spacer row for REC dropdown */
    .signal-chain--horizontal.signal-chain--compact {
        grid-template-rows: auto auto 60px auto;
    }

    .signal-chain--horizontal.signal-chain--compact > .signal-node-path {
        grid-row: 4;
    }
    .signal-chain--horizontal.signal-chain--compact > .signal-node-amp {
        grid-row: 4;
    }
    .signal-chain--horizontal.signal-chain--compact > .signal-node-prot {
        grid-row: 4;
    }
    .signal-chain--horizontal.signal-chain--compact > .signal-node-relay {
        grid-row: 4;
    }
    .signal-chain--horizontal.signal-chain--compact > .signal-node-out {
        grid-row: 4;
    }

    .signal-chain--horizontal.signal-chain--compact > .signal-node-mode::after {
        height: calc(60px + var(--connector-h) * 2);
    }
}

/* --- signal-chain-responsive.css --- */
/* ===== LAYOUTS/SIGNAL-CHAIN-RESPONSIVE.CSS ===== */
/* Responsive adjustments for signal chain */

@media (max-width: 680px) {
    .signal-chain {
        padding: 20px 20px;
    }

    .signal-chain > * {
        width: 100px;
    }

    .signal-chain > .signal-bus {
        width: 100%;
    }

    .signal-chain > .signal-node-path,
    .signal-chain > .signal-node-out {
        width: auto;
    }

    .signal-rec-modes {
        position: relative;
        left: 0;
        transform: none;
        margin-top: 10px;
        margin-left: 0;
        width: 100%;
    }

    .signal-rec-modes::before {
        display: none;
    }

    .signal-fork-paths,
    .signal-split-paths {
        flex-direction: column;
        align-items: center;
    }

    .signal-fork-paths::before,
    .signal-fork-paths::after,
    .signal-split-paths::before {
        content: none;
    }

    .signal-fork-path::before,
    .signal-fork-path::after,
    .signal-split-path::before {
        content: none;
    }

    .signal-fork-path,
    .signal-split-path {
        width: 100px;
    }
}

/* --- signal-chain-interactive.css --- */
/* 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;
  }
}