#toast-container {
  position: fixed;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
}
.toast {
  background: #333;
  color: #fff;
  padding: .75rem 1.25rem;
  margin-top: .5rem;
  border-radius: .375rem;
  opacity: .9;
}

body.participant {
  /* Disables pull-to-refresh but allows overscroll glow effects. */
  overscroll-behavior-y: contain;
}

/* ============================================
   TRACE SCREEN STYLES
   ============================================ */

/* Main container - gradient background */
.trace-container {
  display: flex;
  min-height: 100dvh;
  width: 100dvw;
  padding: var(--spacing-space-3);
  gap: var(--spacing-space-2);
  background: linear-gradient(135deg, var(--color-bg-colorful) 0%, var(--color-brand-soft) 100%);
}

/* Card containing the graph */
.trace-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-card);
  padding: var(--spacing-space-3) var(--spacing-space-4);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

/* Header area */
.trace-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-space-3);
  margin-bottom: var(--spacing-space-2);
}

.trace-back-link {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--color-text-primary);
  font-size: 14px;
  font-weight: 600;
  text-decoration: underline;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.trace-back-link:hover {
  color: var(--color-brand-primary);
}

.trace-back-chevron {
  font-weight: normal;
}

.trace-question {
  flex: 1;
  text-align: center;
  font-size: var(--text-body);
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 0;
  line-height: var(--leading-body);
}

/* Graph area */
.trace-graph-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.trace-graph-wrapper {
  flex: 1;
  position: relative;
  min-height: 200px;
}

.trace-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* Placeholder text */
.trace-placeholder {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  font-size: var(--text-body);
  color: var(--color-text-muted);
  pointer-events: none;
  line-height: var(--leading-body);
}

.trace-placeholder.hidden {
  display: none;
}

/* Action buttons panel on the right */
.trace-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-space-2);
  padding: var(--spacing-space-2) 0;
}

.trace-actions-spacer {
  flex: 1;
}

.trace-action-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  padding: 0;
}

.trace-action-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.trace-action-icon {
  width: 20px;
  height: 20px;
  object-fit: contain;
}

/* Undo/Redo buttons - filled when active, outline when disabled */
.trace-action-undoredo {
  background: var(--color-brand-primary);
  border: 2px solid var(--color-brand-primary);
}

.trace-action-undoredo:hover:not(:disabled) {
  background: var(--color-brand-dark);
  border-color: var(--color-brand-dark);
}

.trace-action-undoredo:disabled {
  background: var(--color-brand-primary);
  border: 2px solid var(--color-brand-primary);
  opacity: 0.5;
}

/* Filled style button (Erase) */
.trace-action-filled {
  background: var(--color-brand-primary);
  border: 2px solid var(--color-brand-primary);
}

.trace-action-filled:hover:not(:disabled) {
  background: var(--color-brand-dark);
  border-color: var(--color-brand-dark);
}

/* Primary action button (Next) */
.trace-action-primary {
  background: var(--color-brand-primary);
  border: 2px solid var(--color-brand-primary);
}

.trace-action-primary:hover:not(:disabled) {
  background: var(--color-brand-dark);
  border-color: var(--color-brand-dark);
}