/* ── CSS Variables (copied from DecoderGames) ────────────────────────── */
:root {
  --bg: #f6f7fb;
  --bg-muted: #e9ebf3;
  --text: #1f2630;
  --primary: #4a6cf7;
  --border: #cfd5e4;
  --accent: #f0f4ff;
  --surface: #ffffff;
  --muted: #6b7280;

  /* Vaporwave Palette */
  --vw-orange: #FF5E00;
  --vw-fuchsia: #FF00FF;
  --vw-blue: #00FFFF;
  --vw-purple: #8A2BE2;
  --vw-green: #39FF14;
  --vw-red: #FF2D55;
}

body {
    font-family: Inter, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0px;
    transition: background-color 0.3s, color 0.3s;
}

body.dark {
  --bg: #111827;
  --bg-muted: #1f2937;
  --text: #ffffff;
  --primary: #8b9cf9;
  --border: #374151;
  --accent: #1f2937;
  --surface: #0b1221;
  background-color: var(--bg);
  color: var(--text);
}

/* ── Header ───────────────────────────────────────────────────────────── */
.main-header {
    margin-bottom: 3rem;
    padding: 2rem 0px;
    border-bottom: 1px solid var(--border);
}

.main-header .container
 {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.container {
	max-width: 2000px;
    margin: 0px auto;
    padding: 0px 1.5rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.back-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.875rem;
  transition: color 0.2s;
}
.back-link:hover { color: var(--primary); }

.header-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.icon-btn {
    cursor: pointer;
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 0.5rem;
    transition: background-color 0.2s;
}

.icon-btn:hover {
  background-color: var(--border);
}

/* ── Toolbar ──────────────────────────────────────────────────────────── */
.toolbar {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 0.75rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  transition: background-color 0.3s, border-color 0.3s;
}

.controls-left,
.controls-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ── Shared Button Styles (DecoderGames pattern) ──────────────────────── */
.mode-btn {
  background-color: var(--bg);
  border: 1px solid var(--border);
  padding: 0.4rem 0.875rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
  font-size: 0.875rem;
  transition: all 0.2s;
}
.mode-btn:hover { border-color: var(--primary); }
.mode-btn.active {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
}

.toggle-btn {
  width: 44px;
  height: 36px;
  border-radius: 0.4rem;
  border: 1px solid var(--border);
  background-color: var(--surface);
  color: var(--text);
  font-weight: bold;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}
.toggle-btn:hover { border-color: var(--primary); }
.toggle-btn.active {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
}
.toggle-btn.set-btn.active {
  background-color: var(--vw-green);
  color: #000;
  border-color: var(--vw-green);
}
.toggle-btn.reset-btn.active {
  background-color: var(--vw-red);
  color: #fff;
  border-color: var(--vw-red);
}

.clk-pulse-btn {
  width: auto;
  padding: 0 0.75rem;
  font-size: 0.8rem;
}

button.primary {
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 0.45rem 1rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: background-color 0.2s;
}
button.primary:hover { background-color: #3a5bd9; }
button.primary.active {
  background-color: var(--vw-orange);
  border-color: var(--vw-orange);
}

/* ── LED indicator ────────────────────────────────────────────────────── */
.led-wrap {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.led {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: #333;
  border: 2px solid var(--border);
  transition: background-color 0.2s, border-color 0.2s;
  flex-shrink: 0;
}
.led.on {
  background-color: var(--vw-orange);
  border-color: var(--vw-orange);
  box-shadow: 0 0 6px var(--vw-orange);
}
.led.q-on {
  background-color: var(--vw-purple);
  border-color: var(--vw-purple);
  box-shadow: 0 0 6px var(--vw-purple);
}

.led-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}

/* ── Circuits section ─────────────────────────────────────────────────── */
.circuits-section {
  padding: 1rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* ── Bus Layer ────────────────────────────────────────────────────────── */
.bus-layer {
  margin: 0 0 0 0;
}

.bus-label {
  font-size: 8px;
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  dominant-baseline: auto;
}

.bus-h {
  stroke-width: 3;
  fill: none;
}
.bus-v {
  stroke-width: 2;
  fill: none;
}

/* ── Signal Wire Classes ──────────────────────────────────────────────── */
.signal-path {
  stroke-width: 3;
  fill: none;
  transition: stroke 0.2s, filter 0.2s;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* CLK — orange */
.sig-clk              { stroke: rgba(255, 94, 0, 0.28); }
.sig-clk.high         { stroke: var(--vw-orange); filter: drop-shadow(0 0 4px var(--vw-orange)); }

/* D / T — cyan */
.sig-d                { stroke: rgba(0, 255, 255, 0.28); }
.sig-d.high           { stroke: var(--vw-blue); filter: drop-shadow(0 0 4px var(--vw-blue)); }

/* J — green */
.sig-j                { stroke: rgba(57, 255, 20, 0.28); }
.sig-j.high           { stroke: var(--vw-green); filter: drop-shadow(0 0 4px var(--vw-green)); }

/* K — fuchsia */
.sig-k                { stroke: rgba(255, 0, 255, 0.28); }
.sig-k.high           { stroke: var(--vw-fuchsia); filter: drop-shadow(0 0 4px var(--vw-fuchsia)); }

/* S (Set) — green */
.sig-s                { stroke: rgba(57, 255, 20, 0.28); }
.sig-s.high           { stroke: var(--vw-green); filter: drop-shadow(0 0 4px var(--vw-green)); }

/* R (Reset) — red */
.sig-r                { stroke: rgba(255, 45, 85, 0.28); }
.sig-r.high           { stroke: var(--vw-red); filter: drop-shadow(0 0 4px var(--vw-red)); }

/* Q — purple */
.sig-q                { stroke: rgba(138, 43, 226, 0.28); }
.sig-q.high           { stroke: var(--vw-purple); filter: drop-shadow(0 0 4px var(--vw-purple)); }

/* Internal nodes — dim border → cyan when active */
.sig-internal         { stroke: rgba(100, 116, 139, 0.35); }
.sig-internal.high    { stroke: var(--vw-blue); filter: drop-shadow(0 0 3px var(--vw-blue)); }

/* ── Gate / Symbol SVG elements ───────────────────────────────────────── */
.device-box {
  fill: var(--surface);
  stroke: var(--border);
  stroke-width: 2;
  transition: fill 0.3s, stroke 0.3s;
}

.gate-box {
  fill: var(--bg-muted);
  stroke: var(--border);
  stroke-width: 1.5;
  rx: 3;
  transition: fill 0.3s, stroke 0.3s;
}

.gate-bubble {
  fill: var(--bg-muted);
  stroke: var(--border);
  stroke-width: 1.5;
  transition: fill 0.3s, stroke 0.3s;
}

.clk-triangle {
  fill: none;
  stroke: var(--border);
  stroke-width: 1.5;
  stroke-linejoin: miter;
  transition: stroke 0.3s;
}

.pin-text {
  fill: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 600;
  dominant-baseline: middle;
}

.pin-right {
  text-anchor: end;
}

.device-label {
  fill: var(--muted);
  font-family: 'Inter', sans-serif;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.gate-label {
  fill: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 8px;
  font-weight: 700;
  dominant-baseline: middle;
}

.pin-text-sm {
  fill: var(--muted);
  font-family: 'Inter', monospace;
  font-size: 10px;
  font-weight: 700;
  dominant-baseline: middle;
}

/* ── Circuit Cards ────────────────────────────────────────────────────── */
.circuits-row {
  display: flex;
  gap: 0.75rem;
  align-items: stretch;
  overflow-x: auto;
}

.circuit-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 0.875rem 0.75rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.625rem;
  transition: background-color 0.3s, border-color 0.2s;
  min-width: 0;
}
.circuit-card:hover { border-color: var(--vw-orange); }

.card-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Show/hide symbol vs circuit SVG */
.circuit-svg { display: none; }

body.analyze-on .circuit-svg  { display: block; }
body.analyze-on .symbol-svg   { display: none; }

/* ── JK input controls ────────────────────────────────────────────────── */
.jk-inputs {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.jk-row {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.jk-label {
  font-size: 0.8rem;
  font-weight: 700;
}

.sig-d-label { color: var(--vw-blue); }
.sig-j-label { color: var(--vw-green); }
.sig-k-label { color: var(--vw-fuchsia); }
.sig-s-label { color: var(--vw-green); }
.sig-r-label { color: var(--vw-red); }

/* ── Mode label (D Latch) ─────────────────────────────────────────────── */
.mode-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 0.35rem;
  background-color: var(--bg-muted);
  color: var(--muted);
  transition: background-color 0.2s, color 0.2s;
}
.mode-label.transparent {
  background-color: rgba(0, 255, 255, 0.15);
  color: var(--vw-blue);
}

/* ── Q Output row ─────────────────────────────────────────────────────── */
.q-output {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: auto;
}

.q-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* ── Info bubble ──────────────────────────────────────────────────────── */
.info-bubble {
  position: fixed;
  z-index: 200;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.65rem 0.875rem;
  max-width: 280px;
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--text);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  pointer-events: none;
  transform: translateX(-50%);
}

/* ── Timing diagram hover regions ─────────────────────────────────────── */
.timing-region {
  fill: rgba(255, 94, 0, 0);
  pointer-events: all;
  cursor: default;
  transition: fill 0.1s;
}
.timing-region:hover {
  fill: rgba(255, 94, 0, 0.15);
}

/* ── Per-card timing trace ─────────────────────────────────────────────── */
.card-timing {
  width: 100%;
  border-top: 1px solid var(--border);
  padding-top: 0.4rem;
  margin-top: 0.25rem;
  transition: border-color 0.3s;
}

.card-timing svg {
  display: block;
}

/* ── Dialog (Settings) ────────────────────────────────────────────────── */
.dialog-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
}

.dialog {
  background-color: var(--surface);
  padding: 2rem;
  border-radius: 1rem;
  max-width: 420px;
  width: 90%;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.dialog h2 {
  margin-top: 0;
  margin-bottom: 1.5rem;
  color: var(--text);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 2rem;
}

.form-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  color: var(--text);
}

/* Toggle switch */
.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

.switch input { opacity: 0; width: 0; height: 0; }

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--bg-muted);
  transition: .4s;
  border: 1px solid var(--border);
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 4px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
}

input:checked + .slider { background-color: var(--primary); }
input:checked + .slider:before { transform: translateX(26px); }

.slider.round { border-radius: 24px; }
.slider.round:before { border-radius: 50%; }

.hidden { display: none !important; }

/* ── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 700px) {
  .circuits-row {
    flex-direction: column;
  }
  .circuit-card {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
  }
}