.signal-page {
  --signal-wire: #171717;
  --signal-soft-wire: #b2b2b2;
  --signal-danger: #dc2626;
  --signal-grid: #f4f4f4;
}

.signal-layout {
  display: grid;
  gap: 24px;
  padding: 32px 0 80px;
}

.signal-titlebar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
}

.signal-titlebar h1 {
  font-size: 48px;
}

.signal-game {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--canvas);
  box-shadow: var(--shadow-md);
}

.signal-toolbar,
.signal-hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px;
  border-bottom: 1px solid var(--line);
}

.signal-levels,
.signal-actions,
.overlay-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.signal-level,
.signal-button {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0 13px;
  color: var(--text);
  background: var(--canvas);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    background 160ms ease;
}

.signal-level:hover,
.signal-level:focus-visible,
.signal-button:hover,
.signal-button:focus-visible {
  transform: translateY(-1px);
  border-color: var(--hairline-strong);
  background: var(--canvas-soft);
}

.signal-level.is-active {
  color: var(--canvas);
  border-color: var(--canvas-night);
  background: var(--canvas-night);
}

.signal-button.primary {
  color: var(--ink);
  border-color: var(--primary);
  background: var(--primary);
}

.signal-hud {
  flex-wrap: wrap;
  background: var(--canvas-soft);
}

.signal-stat {
  display: grid;
  gap: 2px;
  min-width: 108px;
}

.signal-stat span,
.panel-heading span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: uppercase;
}

.signal-stat strong,
.panel-heading strong {
  color: var(--text);
  font-size: 16px;
  font-weight: 500;
}

.signal-status {
  flex: 1 1 220px;
  min-height: 24px;
  margin: 0;
  color: var(--muted);
  font-weight: 500;
  text-align: right;
}

.signal-status.is-good {
  color: var(--primary-deep);
}

.signal-status.is-alert {
  color: var(--signal-danger);
}

.signal-stage {
  display: grid;
  grid-template-columns: minmax(230px, 0.32fr) minmax(0, 1fr);
  gap: 16px;
  padding: 16px;
  background: var(--canvas-soft);
}

.signal-side {
  display: grid;
  align-content: start;
  gap: 16px;
}

.signal-panel {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  background: var(--canvas);
  box-shadow: var(--shadow-sm);
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 48px;
  padding: 12px;
  border-bottom: 1px solid var(--hairline-cool);
}

.target-list {
  display: grid;
  gap: 8px;
  padding: 12px;
}

.target-item {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  min-height: 38px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 0 10px;
  color: var(--ink-mute);
  background: var(--canvas);
  font-size: 13px;
}

.target-item::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--ink-faint);
}

.target-item.is-linked {
  color: var(--ink);
  border-color: rgba(62, 207, 142, 0.5);
  background: rgba(62, 207, 142, 0.09);
}

.target-item.is-linked::before {
  background: var(--primary);
}

.target-item span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.target-item strong {
  color: inherit;
  font-size: 12px;
  font-weight: 500;
}

.signal-trace-panel {
  color: var(--canvas);
  background: var(--canvas-night);
}

.signal-trace-panel .panel-heading {
  border-color: rgba(255, 255, 255, 0.1);
}

.signal-trace-panel .panel-heading span,
.signal-trace-panel .panel-heading strong {
  color: var(--canvas);
}

.signal-log {
  display: grid;
  gap: 7px;
  min-height: 148px;
  padding: 13px;
  color: rgba(255, 255, 255, 0.78);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  line-height: 1.45;
}

.signal-log-line {
  display: flex;
  gap: 8px;
  min-width: 0;
}

.signal-log-line span {
  flex: 0 0 auto;
  color: var(--primary-soft);
}

.signal-log-line code {
  min-width: 0;
  overflow: hidden;
  color: inherit;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.signal-board-area {
  position: relative;
  min-width: 0;
}

.signal-board {
  --cols: 5;
  --rows: 5;
  display: grid;
  grid-template-columns: repeat(var(--cols), minmax(0, 1fr));
  grid-template-rows: repeat(var(--rows), minmax(0, 1fr));
  gap: clamp(6px, 1vw, 10px);
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  aspect-ratio: var(--cols) / var(--rows);
  min-height: 430px;
  overflow: hidden;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: clamp(10px, 1.5vw, 16px);
  background:
    linear-gradient(90deg, var(--signal-grid) 1px, transparent 1px),
    linear-gradient(0deg, var(--signal-grid) 1px, transparent 1px),
    var(--canvas);
  background-size: 34px 34px;
  box-shadow: var(--shadow-sm);
}

.signal-cell {
  min-width: 0;
  min-height: 0;
}

.signal-cell.is-empty {
  border: 1px dashed var(--hairline-cool);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.62);
}

.signal-tile {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  min-height: 54px;
  overflow: hidden;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-sm);
  color: var(--ink);
  background: var(--canvas);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition:
    border-color 140ms ease,
    box-shadow 140ms ease,
    transform 140ms ease;
}

.signal-tile:hover,
.signal-tile:focus-visible {
  transform: translateY(-1px);
  border-color: var(--ink);
  box-shadow: var(--shadow-md);
}

.signal-tile.is-locked {
  cursor: default;
}

.signal-tile.is-locked:hover {
  transform: none;
}

.signal-tile.is-powered {
  border-color: rgba(62, 207, 142, 0.72);
}

.signal-tile.is-target.is-powered {
  background: rgba(62, 207, 142, 0.08);
}

.signal-link,
.signal-core {
  position: absolute;
  background: var(--signal-soft-wire);
  transition:
    background 160ms ease,
    box-shadow 160ms ease;
}

.signal-tile.is-powered .signal-link,
.signal-tile.is-powered .signal-core {
  background: var(--primary);
  box-shadow: 0 0 0 1px rgba(62, 207, 142, 0.22);
}

.signal-link.up,
.signal-link.down {
  left: calc(50% - 3px);
  width: 6px;
  height: calc(50% + 1px);
}

.signal-link.up {
  bottom: 50%;
}

.signal-link.down {
  top: 50%;
}

.signal-link.left,
.signal-link.right {
  top: calc(50% - 3px);
  width: calc(50% + 1px);
  height: 6px;
}

.signal-link.left {
  right: 50%;
}

.signal-link.right {
  left: 50%;
}

.signal-core {
  left: 50%;
  top: 50%;
  z-index: 1;
  width: 24px;
  height: 24px;
  border: 4px solid var(--canvas);
  border-radius: 999px;
  transform: translate(-50%, -50%);
}

.signal-tile.is-source .signal-core {
  background: var(--canvas-night);
}

.signal-tile.is-source.is-powered .signal-core {
  background: var(--primary);
}

.signal-tile.is-target .signal-core {
  background: var(--canvas);
  box-shadow: inset 0 0 0 4px var(--signal-soft-wire);
}

.signal-tile.is-target.is-powered .signal-core {
  background: var(--canvas);
  box-shadow:
    inset 0 0 0 4px var(--primary),
    0 0 0 1px rgba(62, 207, 142, 0.22);
}

.signal-label {
  position: absolute;
  left: 7px;
  top: 6px;
  z-index: 2;
  color: var(--ink-mute);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 10px;
  font-weight: 500;
  line-height: 1;
}

.signal-tile.is-powered .signal-label {
  color: var(--ink);
}

.signal-tile.is-flash {
  animation: signal-flash 520ms ease;
}

.signal-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 16px;
  border-radius: var(--radius-lg);
  background: rgba(28, 28, 28, 0.52);
  backdrop-filter: blur(8px);
}

.signal-overlay[hidden] {
  display: none;
}

.signal-dialog {
  width: min(430px, 100%);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: clamp(18px, 3vw, 26px);
  background: var(--canvas);
  box-shadow: 0 22px 44px rgba(16, 19, 26, 0.26);
}

.signal-dialog h2 {
  font-size: 32px;
}

.signal-dialog p:not(.eyebrow) {
  color: var(--muted);
}

.overlay-actions {
  margin-top: 16px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
  padding: 0;
}

@keyframes signal-flash {
  0%,
  100% {
    filter: none;
  }

  45% {
    filter: saturate(1.25);
    box-shadow:
      0 0 0 3px rgba(62, 207, 142, 0.22),
      var(--shadow-md);
  }
}

@media (max-width: 920px) {
  .signal-stage {
    grid-template-columns: 1fr;
  }

  .signal-board-area {
    order: -1;
  }

  .signal-side {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .signal-board {
    min-height: 0;
  }
}

@media (max-width: 680px) {
  .signal-titlebar,
  .signal-toolbar,
  .signal-hud {
    align-items: flex-start;
    flex-direction: column;
  }

  .signal-titlebar h1 {
    font-size: 34px;
  }

  .signal-status {
    flex: 0 1 auto;
    width: 100%;
    text-align: left;
  }

  .signal-side {
    grid-template-columns: 1fr;
  }

  .signal-board {
    gap: 5px;
    padding: 8px;
  }

  .signal-core {
    width: 19px;
    height: 19px;
    border-width: 3px;
  }

  .signal-link.up,
  .signal-link.down {
    left: calc(50% - 2px);
    width: 4px;
  }

  .signal-link.left,
  .signal-link.right {
    top: calc(50% - 2px);
    height: 4px;
  }
}

@media (max-width: 480px) {
  .signal-stage {
    padding: 12px;
  }

  .signal-titlebar h1 {
    font-size: 30px;
  }

  .signal-tile {
    min-height: 45px;
  }

  .signal-label {
    display: none;
  }
}