/* ===== 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 auto;
    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);
}

.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;
}