:root {
  /* Linear-inspired: neutral zinc grays + a single indigo signal accent.
     Dark is default; light is white-paper. */

  /* Dark */
  --bg-primary: #0e0e10;
  --bg-secondary: #131316;
  --bg-card: #18181b;
  --bg-card-hover: #232327;
  --border: #27272a;
  --border-active: #3f3f46;
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --accent-blue: #6366f1;
  --accent-cyan: #22d3ee;
  --accent-green: #10b981;
  --accent-red: #f43f5e;
  --accent-amber: #f59e0b;
  --accent-purple: #a78bfa;
  --glow-blue: rgba(99, 102, 241, 0.14);
  --glow-green: rgba(16, 185, 129, 0.12);
  --glow-red: rgba(244, 63, 94, 0.12);
  --surface-translucent: rgba(14, 14, 16, 0.9);
  --surface-translucent-2: rgba(19, 19, 21, 0.7);
  --log-row-border: rgba(39, 39, 42, 0.6);
  --grid-line: rgba(255, 255, 255, 0.015);
}

:root[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-card: #ffffff;
  --bg-card-hover: #f4f4f5;
  --border: #e4e4e7;
  --border-active: #a1a1aa;
  --text-primary: #18181b;
  --text-secondary: #52525b;
  --text-muted: #a1a1aa;
  --accent-blue: #4f46e5;
  --accent-cyan: #0891b2;
  --accent-green: #059669;
  --accent-red: #e11d48;
  --accent-amber: #d97706;
  --accent-purple: #7c3aed;
  --glow-blue: rgba(79, 70, 229, 0.1);
  --glow-green: rgba(5, 150, 105, 0.1);
  --glow-red: rgba(225, 29, 72, 0.1);
  --surface-translucent: rgba(255, 255, 255, 0.9);
  --surface-translucent-2: rgba(250, 250, 250, 0.7);
  --log-row-border: rgba(228, 228, 231, 0.7);
  --grid-line: rgba(0, 0, 0, 0.02);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 13px;
  line-height: 1.4;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ─── Header ─── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.logo svg { width: 16px; height: 16px; }

.header-title {
  font-weight: 600;
  font-size: 14px;
  letter-spacing: -0.2px;
}

.header-title span { color: var(--accent-blue); }

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}

.icon-btn:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
  border-color: var(--border-active);
}

.icon-btn svg { width: 16px; height: 16px; }

:root[data-theme="dark"] .icon-sun,
:root:not([data-theme="light"]) .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon,
:root:not([data-theme="light"]) .icon-moon { display: none; }
:root[data-theme="light"] .icon-sun { display: none; }
:root[data-theme="light"] .icon-moon { display: block; }

.status-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: all 0.15s;
}

.status-chip.connected {
  border-color: rgba(16, 185, 129, 0.4);
  background: var(--glow-green);
  color: var(--accent-green);
}

.status-chip.disconnected {
  color: var(--text-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: all 0.3s;
}

.status-chip.connected .status-dot {
  background: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
  animation: pulse-dot 2s ease-in-out infinite;
}

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

/* ─── Main Layout ─── */
.main {
  display: grid;
  grid-template-columns: 320px 1fr;
  grid-template-rows: 1fr;
  gap: 0;
  flex: 1;
  min-height: 0;
}

/* ─── Sidebar ─── */
.sidebar {
  border-right: 1px solid var(--border);
  background: var(--bg-secondary);
  padding: 14px 14px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
}

/* Shared thin scrollbar — applies to every scrollable region in the app. */
.sidebar,
.log-scroll,
.sniffer-scroll {
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.sidebar::-webkit-scrollbar,
.log-scroll::-webkit-scrollbar,
.sniffer-scroll::-webkit-scrollbar { width: 6px; height: 6px; }

.sidebar::-webkit-scrollbar-track,
.log-scroll::-webkit-scrollbar-track,
.sniffer-scroll::-webkit-scrollbar-track { background: transparent; }

.sidebar::-webkit-scrollbar-thumb,
.log-scroll::-webkit-scrollbar-thumb,
.sniffer-scroll::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover,
.log-scroll::-webkit-scrollbar-thumb:hover,
.sniffer-scroll::-webkit-scrollbar-thumb:hover { background: var(--border-active); }

.panel-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 4px 0 2px;
  padding: 0 2px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  transition: border-color 0.15s;
}

.card:hover { border-color: var(--border-active); }

/* ─── Connect Button ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  width: 100%;
}

.btn:hover { background: var(--bg-card-hover); border-color: var(--border-active); }

.btn[hidden] { display: none; }

.btn-primary {
  background: var(--accent-blue);
  border-color: var(--accent-blue);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-blue);
  border-color: var(--accent-blue);
  color: #fff;
  filter: brightness(1.1);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  color: var(--accent-red);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.2);
  box-shadow: 0 0 20px var(--glow-red);
}

.btn-success {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--accent-green);
}

.btn-success:hover {
  background: rgba(16, 185, 129, 0.2);
}

.btn-sm {
  padding: 7px 12px;
  font-size: 12px;
  border-radius: 5px;
}

.btn.paused {
  border-color: rgba(245, 158, 11, 0.4);
  color: var(--accent-amber);
  background: rgba(245, 158, 11, 0.1);
}

/* ─── Form Controls ─── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
}

.form-group:last-child { margin-bottom: 0; }

label {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
}

select, input[type="text"], input[type="number"] {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 6px 10px;
  color: var(--text-primary);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

select { font-family: inherit; }

select:focus, input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 2px var(--glow-blue);
}

input.invalid, input.invalid:focus {
  border-color: var(--accent-red);
  box-shadow: 0 0 0 3px var(--glow-red);
}

select { cursor: pointer; }
select option { background: var(--bg-secondary); }

select:disabled, input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ─── Top Bar (Stats) ─── */
.stats-bar {
  display: flex;
  align-items: center;
  padding: 8px 16px;
  gap: 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.stat {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-secondary);
}

.stat-value {
  color: var(--text-primary);
  font-weight: 600;
  min-width: 36px;
}

.stat-label { color: var(--text-muted); font-size: 11px; }
.stat-rate { color: var(--text-muted); font-size: 11px; margin-left: 4px; }

/* ─── Message Log ─── */
.log-area {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.log-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.log-toolbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.filter-chip {
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-muted);
  transition: all 0.15s;
}

.filter-chip:hover { color: var(--text-secondary); }
.filter-chip.active {
  background: var(--glow-blue);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.log-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
  scroll-behavior: smooth;
}

.sniffer-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 0;
}

/* ─── Cluster (simulator overlay) ───
   Floats over the log/sniffer area so the user can see the bus and the
   cluster reaction at the same time. Visibility is gated by the sim state
   via setClusterVisible(true|false). */
.cluster-area {
  position: fixed;
  bottom: 80px;
  right: 20px;
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
  max-width: calc(100vw - 40px);
}

.cluster-area[hidden] { display: none; }

.cluster-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: -14px -14px 0;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-translucent-2);
  border-top-left-radius: 8px;
  border-top-right-radius: 8px;
  color: var(--text-muted);
  cursor: move;
  user-select: none;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.cluster-header-actions {
  display: flex;
  gap: 2px;
}

.cluster-iconbtn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  transition: color 0.15s, background 0.15s;
}

.cluster-iconbtn:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.cluster-area.minimized > *:not(.cluster-header) { display: none; }

.cluster-area.minimized .cluster-header { margin-bottom: -14px; border-bottom-color: transparent; }

.cluster-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.cluster-gauges {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
}

.cluster-svg {
  width: 170px;
  height: 170px;
  flex: 0 0 auto;
}

.cluster-svg .gauge-face {
  fill: var(--bg-primary);
  stroke: var(--border);
  stroke-width: 1;
}

.cluster-svg .gauge-ring {
  fill: none;
  stroke: var(--border-active);
  stroke-width: 2;
  opacity: 0.3;
}

.cluster-svg .gauge-ticks line {
  stroke: var(--text-secondary);
  stroke-width: 2;
}

.cluster-svg .gauge-ticks line.redline {
  stroke: var(--accent-red);
  stroke-width: 3;
}

.cluster-svg .gauge-needle {
  stroke: var(--accent-blue);
  stroke-width: 3;
  stroke-linecap: round;
}

.cluster-svg .gauge-hub { fill: var(--accent-blue); }

.cluster-svg .gauge-value {
  fill: var(--text-primary);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 28px;
  font-weight: 700;
}

.cluster-svg .gauge-unit {
  fill: var(--text-muted);
  font-size: 11px;
  letter-spacing: 1px;
}

.cluster-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  min-width: 96px;
}

.cluster-signals {
  display: flex;
  gap: 12px;
}

.signal-light {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
  background: var(--bg-card);
  transition: color 0.1s, border-color 0.1s, background 0.1s, box-shadow 0.1s;
}

.signal-light.active {
  color: var(--accent-amber);
  border-color: var(--accent-amber);
  background: var(--glow-blue);
  box-shadow: 0 0 12px var(--accent-amber);
  animation: signal-blink 0.6s steps(2, end) infinite;
}

@keyframes signal-blink {
  50% { opacity: 0.35; }
}

.cluster-doors {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.door-indicator {
  width: 42px;
  padding: 4px 8px;
  text-align: center;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1px;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  background: var(--bg-card);
  transition: color 0.1s, border-color 0.1s, background 0.1s;
}

.door-indicator.open {
  color: var(--accent-red);
  border-color: var(--accent-red);
  background: var(--glow-red);
}

.cluster-warnings {
  align-self: stretch;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.warn-lamp {
  padding: 4px 8px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  background: var(--bg-card);
  transition: color 0.1s, border-color 0.1s, background 0.1s, box-shadow 0.1s;
}

.warn-lamp.active {
  color: var(--accent-amber);
  border-color: var(--accent-amber);
  background: var(--glow-blue);
  box-shadow: 0 0 8px var(--accent-amber);
}

.cluster-lcd {
  align-self: stretch;
  height: 26px;
  padding: 0 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  letter-spacing: 2px;
  color: #7CFF7C;
  background: #102010;
  border: 1px solid var(--border);
  border-radius: 4px;
  box-sizing: border-box;
}

.cluster-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.cluster-controls .btn {
  width: 100%;
  min-width: 0;
  padding: 6px 10px;
  font-size: 11px;
}

.cluster-controls .cluster-btn-accel {
  color: var(--accent-green);
  border-color: var(--accent-green);
}

.cluster-controls .cluster-btn-brake {
  color: var(--accent-red);
  border-color: var(--accent-red);
}

.cluster-controls .cluster-btn-accel:hover,
.cluster-controls .cluster-btn-brake:hover {
  background: var(--bg-card-hover);
}

.sniff-row {
  display: grid;
  grid-template-columns: 80px 80px 70px 50px 1fr 90px;
  align-items: center;
  gap: 12px;
  padding: 4px 16px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12px;
  border-bottom: 1px solid var(--log-row-border);
  cursor: pointer;
  transition: background 0.4s ease-out, opacity 0.4s ease-out;
}

.sniff-row:hover { background: var(--bg-card-hover); }

.sniff-row.stale { opacity: 0.4; }

.sniff-row.copied {
  background: rgba(16, 185, 129, 0.18);
  transition: background 0s;
}

/* Two-class selectors so this rule wins on specificity over the bare
   .log-entry / .sniff-row rules regardless of source order. */
.sniff-row.sniff-header,
.log-entry.log-header {
  background: var(--surface-translucent-2);
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
  padding: 8px 16px;
  cursor: default;
  animation: none;
}

/* Reset every child cell so each header column renders as plain text in
   the header's font-size/color/weight, ignoring the visual chrome
   (chip box on .log-dir, flex/letter-spacing on .sniff-* cells).
   The double-class selectors lift specificity above .log-id/.sniff-id
   etc. so the reset wins on ties regardless of source order. */
.sniff-row.sniff-header > *,
.log-entry.log-header > * {
  font-size: inherit;
  font-weight: inherit;
  color: inherit;
  letter-spacing: inherit;
  text-align: left;
  background: transparent;
  width: auto;
  height: auto;
  display: block;
  border-radius: 0;
  padding: 0;
}

.sniff-header[hidden],
.log-header[hidden] { display: none; }

.sniff-id { color: var(--text-secondary); font-weight: 600; }
.sniff-cycle { color: var(--text-secondary); }
.sniff-count { color: var(--text-secondary); }
.sniff-dlc { color: var(--text-secondary); }
.sniff-data { display: flex; gap: 4px; flex-wrap: wrap; color: var(--text-secondary); }
.sniff-ascii {
  color: var(--text-secondary);
  letter-spacing: 1px;
  white-space: pre;
}

.sniff-byte {
  display: inline-block;
  min-width: 22px;
  text-align: center;
  padding: 1px 3px;
  border-radius: 3px;
  transition: background 0.2s ease-out, color 0.2s ease-out;
}

.log-entry {
  display: grid;
  grid-template-columns: 90px 32px 80px 1fr 60px;
  align-items: center;
  gap: 12px;
  padding: 4px 16px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12px;
  border-bottom: 1px solid var(--log-row-border);
  transition: background 0.1s;
  animation: fadeIn 0.15s ease;
  cursor: pointer;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes rowFlash {
  from { background: rgba(16, 185, 129, 0.25); }
  to { background: transparent; }
}

.log-entry:hover { background: var(--bg-card-hover); }
.log-entry.copied { animation: rowFlash 0.6s ease-out; }

.log-header:hover,
.sniff-header:hover { background: var(--surface-translucent-2); }

.log-entry.tx-row {
  background: var(--glow-blue);
  border-left: 2px solid var(--accent-blue);
}

.log-time { color: var(--text-secondary); }

.log-dir {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 20px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
}

.log-dir.rx {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-green);
}

.log-dir.tx {
  background: var(--glow-blue);
  color: var(--accent-blue);
}

.log-id { color: var(--text-secondary); font-weight: 600; }

.log-data { color: var(--text-secondary); word-break: break-all; }

.log-dlc {
  color: var(--text-secondary);
  text-align: right;
}

.log-system {
  padding: 8px 24px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--accent-amber);
  opacity: 0.8;
  border-bottom: 1px solid var(--log-row-border);
}

/* ─── Send Panel ─── */
.send-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.send-bar input {
  flex: 1;
  background: var(--bg-primary);
}

.send-bar .id-input { width: 100px; flex: none; }
.send-bar .dlc-input { width: 55px; flex: none; }
.send-bar .interval-input { width: 72px; flex: none; }

.btn-repeat {
  background: rgba(139, 92, 246, 0.1);
  border-color: rgba(139, 92, 246, 0.3);
  color: var(--accent-purple);
}

.btn-repeat:hover {
  background: rgba(139, 92, 246, 0.2);
}

.btn-repeat.active {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.4);
  color: var(--accent-red);
  animation: pulse-repeat 1.5s ease-in-out infinite;
}

.btn-repeat.active:hover {
  background: rgba(239, 68, 68, 0.25);
}

@keyframes pulse-repeat {
  0%, 100% { box-shadow: none; }
  50% { box-shadow: 0 0 10px rgba(239, 68, 68, 0.25); }
}

.interval-group {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: none;
  border-left: 1px solid var(--border);
  padding-left: 10px;
  margin-left: 2px;
}

.interval-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ─── Signal Toggles ─── */
.signal-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.signal-row {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 8px 10px;
  transition: all 0.2s;
}

.signal-row.active {
  border-color: rgba(16, 185, 129, 0.4);
  background: rgba(16, 185, 129, 0.06);
}

.signal-toggle {
  width: 36px;
  height: 20px;
  border-radius: 5px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: all 0.2s;
}

.signal-toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: all 0.2s;
}

.signal-toggle.on {
  background: var(--accent-green);
  border-color: var(--accent-green);
}

.signal-toggle.on::after {
  left: 18px;
  background: #fff;
}

.signal-info {
  flex: 1;
  min-width: 0;
}

.signal-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.signal-detail {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 1px;
}

.signal-remove,
.signal-edit {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  padding: 2px;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.15s;
}

.signal-row:hover .signal-remove,
.signal-row:hover .signal-edit { opacity: 1; }
.signal-remove:hover { color: var(--accent-red); }
.signal-edit:hover { color: var(--accent-blue); }

.add-signal-form {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

.add-signal-row {
  display: flex;
  gap: 4px;
}

.add-signal-row input {
  font-size: 11px;
  padding: 5px 8px;
}

.add-signal-row .sig-name-input { flex: 1; }
.add-signal-row .sig-id-input { width: 60px; }
.add-signal-row .sig-data-input { flex: 2; }
.add-signal-row .sig-ms-input { width: 50px; }

.uds-id-row {
  display: flex;
  gap: 6px;
}

.uds-id-row input {
  flex: 1 1 0;
  min-width: 0;
  width: 0;
}

.fuzz-mode-row {
  display: flex;
  gap: 6px;
}

.fuzz-mode-row select { flex: 0 0 110px; }
.fuzz-mode-row input {
  flex: 1 1 0;
  min-width: 0;
  width: 0;
}

.about-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 11px;
  color: var(--text-muted);
}

.about-card a {
  color: var(--accent-blue);
  text-decoration: none;
  word-break: break-all;
}

.about-card a:hover { text-decoration: underline; }

/* ─── Help / quick-start overlay ─── */
.help-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

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

.help-card {
  position: relative;
  width: 100%;
  max-width: 600px;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px 32px;
  color: var(--text-primary);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

.help-close {
  position: absolute;
  top: 8px;
  right: 12px;
  width: 28px;
  height: 28px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
}

.help-close:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.help-card h2 {
  font-size: 18px;
  margin-bottom: 16px;
}

.help-card section { margin-bottom: 18px; }

.help-card h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-blue);
  margin-bottom: 6px;
}

.help-card p,
.help-card ul {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.help-card ul {
  padding-left: 18px;
  margin-top: 4px;
}

.help-card li { margin-bottom: 4px; }

.help-card code {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12px;
  color: var(--accent-cyan);
  background: var(--bg-secondary);
  padding: 1px 5px;
  border-radius: 3px;
}

.help-tip {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-muted);
  font-style: italic;
}

/* ─── Unsupported-browser overlay ─── */
.unsupported-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

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

.unsupported-card {
  position: relative;
  max-width: 420px;
  background: var(--bg-card);
  border: 1px solid var(--accent-red);
  border-radius: 6px;
  padding: 32px;
  text-align: center;
  box-shadow: 0 0 0 4px var(--glow-red);
}

.unsupported-close {
  position: absolute;
  top: 8px;
  right: 12px;
  width: 28px;
  height: 28px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
}

.unsupported-close:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.unsupported-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 28px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.unsupported-card h2 {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.unsupported-card p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.unsupported-card a {
  color: var(--accent-blue);
  text-decoration: none;
}

.unsupported-card a:hover { text-decoration: underline; }

/* ─── Device Info ─── */
.device-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.info-item {
  background: var(--bg-primary);
  border-radius: 5px;
  padding: 10px;
}

.info-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.info-value {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-primary);
}

/* ─── Empty state ─── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 16px;
  color: var(--text-muted);
  text-align: center;
  padding: 40px;
}

.empty-state[hidden] { display: none; }

.empty-icon {
  width: 64px;
  height: 64px;
  border-radius: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

.empty-state h3 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

.empty-state p { font-size: 13px; max-width: 300px; line-height: 1.5; }

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

.checkbox-row input[type="checkbox"] {
  accent-color: var(--accent-blue);
}

.checkbox-row label {
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
}

/* Responsive */
@media (max-width: 900px) {
  .main {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr;
  }
  .sidebar {
    grid-row: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 300px;
  }
}