/* ============================================
   PMI Plus — Interactive Demo Styling
   ============================================ */

/* --- Demo Container --- */
.demo-container {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  margin: var(--sp-6) 0;
  position: relative;
  border-left: 4px solid var(--demo-accent, var(--ch01-color));
}

.demo-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-4);
}

.demo-title {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.demo-title::before {
  content: '\25B6';
  font-size: var(--text-xs);
  color: var(--demo-accent, var(--ch01-color));
}

.demo-reset-btn {
  font-size: var(--text-xs);
  padding: var(--sp-1) var(--sp-2);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.demo-reset-btn:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* --- Form Inputs --- */
.demo-inputs {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}

.demo-input-group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.demo-input-group.inline {
  flex-direction: row;
  align-items: center;
  gap: var(--sp-3);
}

.demo-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

.demo-input,
.demo-textarea {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  padding: var(--sp-2) var(--sp-3);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
  width: 100%;
}

.demo-input:focus,
.demo-textarea:focus {
  outline: none;
  border-color: var(--demo-accent, var(--ch01-color));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--demo-accent, var(--ch01-color)) 15%, transparent);
}

.demo-textarea {
  resize: vertical;
  min-height: 80px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.demo-input-row {
  display: flex;
  gap: var(--sp-3);
  align-items: flex-end;
}

.demo-input-row .demo-input-group {
  flex: 1;
}

/* --- Buttons --- */
.demo-btn {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--sp-2) var(--sp-4);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
}

.demo-btn-primary {
  background: var(--demo-accent, var(--ch01-color));
  color: #ffffff;
}

.demo-btn-primary:hover {
  filter: brightness(1.1);
}

.demo-btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
}

.demo-btn-secondary:hover {
  background: var(--bg-secondary);
}

.demo-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* --- Output Area --- */
.demo-output {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: var(--sp-4);
  min-height: 60px;
  transition: all var(--transition-fast);
}

.demo-output.empty {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: var(--text-sm);
  font-style: italic;
}

.demo-output .result-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  margin-bottom: var(--sp-1);
}

.demo-output .result-value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
}

.demo-output .result-detail {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-top: var(--sp-1);
}

/* --- Result Grid (multiple outputs) --- */
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--sp-3);
}

.result-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: var(--sp-3);
  text-align: center;
}

.result-card .result-label {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  margin-bottom: var(--sp-1);
}

.result-card .result-value {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.result-card.highlight {
  border-color: var(--demo-accent, var(--ch01-color));
  background: var(--bg-formula);
}

/* --- Sliders --- */
.demo-slider-group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

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

.demo-slider-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

.demo-slider-value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-primary);
  font-weight: 600;
  min-width: 3em;
  text-align: right;
}

.demo-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.demo-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--demo-accent, var(--ch01-color));
  cursor: pointer;
  border: 2px solid var(--bg-primary);
  box-shadow: var(--shadow-sm);
}

.demo-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--demo-accent, var(--ch01-color));
  cursor: pointer;
  border: 2px solid var(--bg-primary);
  box-shadow: var(--shadow-sm);
}

/* --- SVG Charts --- */
.demo-chart {
  width: 100%;
  margin: var(--sp-3) 0;
  overflow: visible;
}

.demo-chart text {
  font-family: var(--font-body);
  fill: var(--text-secondary);
}

.demo-chart .axis-label {
  font-size: 11px;
  fill: var(--text-tertiary);
}

.demo-chart .axis-line {
  stroke: var(--border-primary);
  stroke-width: 1;
}

.demo-chart .grid-line {
  stroke: var(--border-primary);
  stroke-width: 0.5;
  stroke-dasharray: 4,4;
}

.demo-chart .bar {
  transition: opacity var(--transition-fast);
}

.demo-chart .bar:hover {
  opacity: 0.8;
}

.demo-chart .data-point {
  transition: r var(--transition-fast);
}

.demo-chart .data-point:hover {
  r: 6;
}

/* --- Heatmap --- */
.heatmap-container {
  overflow-x: auto;
  margin: var(--sp-3) 0;
}

.heatmap-cell {
  transition: opacity var(--transition-fast);
  cursor: pointer;
}

.heatmap-cell:hover {
  opacity: 0.85;
  stroke: var(--text-primary);
  stroke-width: 2;
}

.heatmap-tooltip {
  position: absolute;
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--text-xs);
  box-shadow: var(--shadow-md);
  pointer-events: none;
  z-index: 20;
  white-space: nowrap;
}

/* --- Result Table (for multi-formula comparisons) --- */
.demo-result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  margin-top: var(--sp-3);
}

.demo-result-table th {
  text-align: left;
  padding: var(--sp-2) var(--sp-3);
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 2px solid var(--border-primary);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.demo-result-table td {
  padding: var(--sp-2) var(--sp-3);
  border-bottom: 1px solid var(--border-primary);
  color: var(--text-secondary);
}

.demo-result-table td.mono {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.demo-result-table tbody tr:hover {
  background: var(--bg-secondary);
}

/* --- Loading / Empty States --- */
.demo-placeholder {
  text-align: center;
  padding: var(--sp-8);
  color: var(--text-tertiary);
  font-size: var(--text-sm);
}

.demo-placeholder p {
  color: var(--text-tertiary);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .demo-container {
    padding: var(--sp-4);
    margin-left: calc(-1 * var(--sp-4));
    margin-right: calc(-1 * var(--sp-4));
    border-radius: 0;
    border-left: none;
    border-right: none;
    border-left: 4px solid var(--demo-accent, var(--ch01-color));
  }

  .demo-input-row {
    flex-direction: column;
  }

  .result-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}