.demo-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 16px;
  align-items: start;
}

/* Stage Container */
.stage-container {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  display: grid;
  place-items: center;
  position: relative;
  min-height: 420px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  margin-bottom: 14px;
}

.performance-stage-wrapper {
  width: 100%;
  max-width: 100%;
}

.performance-stage {
  position: relative;
  width: 100%;
  height: auto;
  max-width: 900px;
  aspect-ratio: 3 / 2;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.1);
  margin: 0 auto;
}

.layer {
  position: absolute;
  inset: 0;
  display: none;
}

.layer[aria-hidden="false"] {
  display: block;
}

/* Stage Overlay */
.stage-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 18, 24, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.stage-overlay:hover {
  background: rgba(15, 18, 24, 0.9);
}

.overlay-content {
  text-align: center;
  color: var(--text);
}

.play-icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: 0.8;
}

.overlay-content p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

/* DOM dots */
.dot {
  position: absolute;
  width: 2px;
  height: 2px;
  background: #4e79a7;
  will-change: transform;
  border-radius: 0.5px;
}

/* Control Panel - moved outside stage */
.control-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}

.control-section {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}

.control-section h3 {
  margin: 0 0 8px 0;
  font-size: 13px;
  color: #cfd6e6;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.control-section label {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 8px;
}

.control-section select {
  width: 100%;
  background: #0f1218;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 13px;
}

.btn-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
  flex: 1;
  min-width: 80px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, #1e3a8a, #1d4ed8);
  color: #e0e7ff;
  border-color: #3b82f6;
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #1d4ed8, #2563eb);
  /* transform: translateY(-1px); */
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
  background: #0f1218;
  color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
  border-color: #3a82f6;
  /* background: rgba(58, 130, 246, 0.1); */
}

.btn-primary:disabled,
.btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Test Specs */
.test-specs {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
}

.spec-label {
  font-size: 12px;
  color: var(--muted);
}

.spec-value {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  font-family: "SF Mono", Monaco, monospace;
}

/* Status Display */
.status-display {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 16px 0 12px 0;
  width: 100%;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.status-item {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
  min-height: 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.status-label {
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 8px;
  letter-spacing: 1px;
  font-weight: 600;
}

.status-value {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  font-family: "SF Mono", Monaco, monospace;
  letter-spacing: -0.5px;
}

/* Mode specific colors */
.mode-display.mode-dom {
  background: linear-gradient(
    135deg,
    rgba(30, 58, 138, 0.1),
    rgba(29, 78, 216, 0.05)
  );
  border-color: #3b82f6;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.1);
}

.mode-display.mode-dom .status-value {
  color: #60a5fa;
}

.mode-display.mode-canvas {
  background: linear-gradient(
    135deg,
    rgba(20, 83, 45, 0.1),
    rgba(22, 163, 74, 0.05)
  );
  border-color: #22c55e;
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.1);
}

.mode-display.mode-canvas .status-value {
  color: #4ade80;
}

.fps-display.fps-high .status-value {
  color: #4ade80;
}

.fps-display.fps-medium .status-value {
  color: #fbbf24;
}

.fps-display.fps-low .status-value {
  color: #f87171;
}

.timer-display.running .status-value {
  color: #60a5fa;
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* Stage Info */
.stage-info {
  margin-top: 4px;
}

.note {
  color: var(--muted);
  font-size: 12px;
  margin: 0;
  text-align: center;
  /* font-style: italic; */
  line-height: 1.4;
}

/* Responsive Design */
@media (max-width: 1100px) {
  .demo-grid {
    grid-template-columns: 1fr 340px;
  }
}

@media (max-width: 900px) {
  .demo-grid {
    grid-template-columns: 1fr;
  }

  .control-panel {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

@media (max-width: 700px) {
  .performance-stage {
    aspect-ratio: 16 / 9;
  }

  .control-panel {
    grid-template-columns: 1fr;
  }

  .status-display {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .status-item {
    padding: 14px;
    min-height: 70px;
  }

  .status-value {
    font-size: 16px;
  }
}

/* Animations */
.performance-stage {
  transition: transform 0.2s ease;
}

.performance-stage:hover {
  transform: scale(1.005);
}