/* Demo containers — matches .sc-container pattern */
  .demo {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    margin: 1.5rem 0;
    background: var(--bg);
    overflow: hidden;
  }
  .demo-title {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--fg-muted);
    margin-bottom: 12px;
    font-weight: 600;
  }

  /* Segment timeline bars */
  .seg-row {
    display: flex;
    gap: 4px;
    margin-bottom: 6px;
    min-height: 52px;
    align-items: stretch;
  }
  .seg-row.old { opacity: 0.35; }
  .seg {
    border-radius: 6px;
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 6px 4px;
    min-width: 0;
    overflow: hidden;
    transition: flex 0.4s ease, opacity 0.4s ease, background 0.4s ease;
  }
  .seg.active { background: var(--accent); }
  .seg.replaced {
    background: var(--fg-dim);
    background-image: repeating-linear-gradient(
      135deg, transparent, transparent 6px, rgba(255,255,255,0.12) 6px, rgba(255,255,255,0.12) 8px
    );
  }
  .seg .dates { font-family: var(--font-mono); font-size: 0.68rem; font-weight: 600; white-space: nowrap; }
  .seg .params { font-family: var(--font-mono); font-size: 0.62rem; opacity: 0.85; white-space: nowrap; text-overflow: ellipsis; overflow: hidden; max-width: 100%; }
  .seg .price { font-size: 0.7rem; font-weight: 700; margin-top: 2px; }

  /* Event list items */
  .event-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 10px;
    border-radius: 6px;
    margin-bottom: 4px;
    font-size: 0.82rem;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--fg-default);
    transition: background 0.2s, border-color 0.2s;
  }
  .event-item.highlight {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 8%, var(--bg));
  }
  .event-item.dimmed { opacity: 0.35; }
  .event-type {
    font-weight: 600;
    min-width: 140px;
    color: var(--fg-emphasis);
  }
  .event-meta { color: var(--fg-muted); font-family: var(--font-mono); font-size: 0.72rem; }

  /* Step controls — matches .sc-btn pattern */
  .demo .controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 12px 0;
    flex-wrap: wrap;
  }
  .demo .controls button {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg);
    color: var(--fg-default);
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s;
  }
  .demo .controls button:hover { border-color: var(--accent); color: var(--accent); }
  .demo .controls button:disabled { opacity: 0.4; cursor: default; }
  .demo .controls button:disabled:hover { border-color: var(--border); color: var(--fg-default); }
  .demo .controls .step-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--fg-muted);
    min-width: 50px;
    text-align: right;
  }
  .seg-progress {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .seg-progress-track {
    flex: 1;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
  }
  .seg-progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.4s ease;
  }

  /* Price summary */
  .price-summary {
    display: flex;
    gap: 20px;
    margin: 10px 0;
    font-size: 0.85rem;
  }
  .price-summary .ps-item { display: flex; flex-direction: column; }
  .price-summary .ps-label { font-family: var(--font-mono); font-size: 0.68rem; color: var(--fg-muted); text-transform: uppercase; letter-spacing: 0.05em; }
  .price-summary .ps-value { font-size: 1.1rem; font-weight: 700; color: var(--fg-emphasis); }
  .price-summary .ps-value.positive { color: #c0392b; }
  .price-summary .ps-value.negative { color: var(--accent); }

  /* Axis labels */
  .axis-labels {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--fg-faint);
    padding: 0 2px;
    margin-bottom: 2px;
  }

  /* Projection history rows */
  .row-label {
    font-size: 0.75rem;
    color: var(--fg-muted);
    min-width: 160px;
    padding-right: 10px;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  .row-label .rl-type { font-weight: 600; color: var(--fg-emphasis); }
  .projection-row {
    display: flex;
    align-items: stretch;
    margin-bottom: 6px;
  }
  .projection-row .seg-row { flex: 1; margin-bottom: 0; }

  /* Slider */
  .slider-container {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 12px 0;
  }
  .slider-container label { font-size: 0.82rem; font-weight: 500; min-width: 80px; color: var(--fg-default); }
  .slider-container input[type=range] { flex: 1; accent-color: var(--accent); }
  .slider-container .slider-value { font-family: var(--font-mono); font-size: 0.82rem; font-weight: 600; min-width: 80px; color: var(--fg-emphasis); }

  /* Preview toggle */
  .preview-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 12px 0;
    padding: 10px 14px;
    border-radius: 6px;
    border: 1px dashed var(--border);
    background: var(--bg-raised);
  }
  .preview-toggle label { font-size: 0.85rem; cursor: pointer; color: var(--fg-default); }
  .preview-toggle input[type=checkbox],
  .preview-toggle input[type=radio] { accent-color: var(--accent); }

  /* Comparison columns */
  .comparison { display: flex; gap: 20px; margin: 12px 0; }
  .comparison > div { flex: 1; }
  .comparison h4 { font-family: var(--font-mono); font-size: 0.7rem; color: var(--fg-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 6px; margin-top: 0; }

  /* Billing chart */
  .billing-chart { margin: 12px 0; }
  .billing-months {
    display: flex;
    gap: 2px;
    align-items: stretch;
    height: 160px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0;
  }
  .billing-month {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-end;
    position: relative;
    height: 100%;
  }
  .billing-bar {
    border-radius: 3px 3px 0 0;
    transition: height 0.4s ease, background 0.3s;
    min-height: 1px;
    position: relative;
  }
  .billing-bar.premium { background: var(--accent); }
  .billing-bar.endorsement { background: #e67e22; }
  .billing-bar.refund { background: #c0392b; }
  .billing-bar.reconciliation { background: #2980b9; }
  .billing-bar-amount {
    font-family: var(--font-mono);
    font-size: 0.58rem;
    color: var(--fg-default);
    text-align: center;
    position: absolute;
    top: -14px;
    left: 0;
    right: 0;
    white-space: nowrap;
    font-weight: 600;
  }
  .billing-labels {
    display: flex;
    gap: 2px;
    margin-top: 4px;
  }
  .billing-label {
    flex: 1;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.58rem;
    color: var(--fg-faint);
  }
  .billing-label.highlight { color: var(--fg-emphasis); font-weight: 600; }
  .billing-legend {
    display: flex;
    gap: 16px;
    margin: 10px 0 6px;
    font-size: 0.72rem;
    color: var(--fg-muted);
  }
  .billing-legend-item { display: flex; align-items: center; gap: 4px; }
  .billing-legend-swatch {
    width: 12px;
    height: 12px;
    border-radius: 2px;
  }
  .billing-totals {
    display: flex;
    gap: 24px;
    margin-top: 10px;
    padding: 10px 0;
    border-top: 1px solid var(--border);
    font-size: 0.82rem;
    flex-wrap: wrap;
  }
  .billing-totals .bt-item { display: flex; flex-direction: column; }
  .billing-totals .bt-label { font-family: var(--font-mono); font-size: 0.65rem; color: var(--fg-muted); text-transform: uppercase; letter-spacing: 0.04em; }
  .billing-totals .bt-value { font-size: 1rem; font-weight: 700; color: var(--fg-emphasis); }
  .billing-month-stack {
    display: flex;
    flex-direction: column;
    gap: 1px;
    justify-content: flex-end;
  }

  /* Kafka demo */
  .kafka-layout {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    margin: 8px 0 12px;
  }
  @media (max-width: 640px) {
    .kafka-layout { flex-direction: column; }
    .kafka-arrow { transform: rotate(90deg); align-self: center; }
  }
  .kafka-topic {
    min-width: 220px;
    max-width: 260px;
    border: 1px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
    flex-shrink: 0;
  }
  .kafka-topic-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 10px;
    background: var(--bg-raised);
    border-bottom: 1px solid var(--border);
  }
  .kafka-topic-name {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--fg-emphasis);
  }
  .kafka-partition-label {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    color: var(--fg-muted);
    background: var(--bg);
    padding: 1px 6px;
    border-radius: 3px;
    border: 1px solid var(--border);
  }
  .kafka-log {
    max-height: 280px;
    overflow-y: auto;
  }
  .kafka-msg {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 10px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    border-bottom: 1px solid var(--border);
    transition: background 0.2s, opacity 0.2s;
    color: var(--fg-default);
  }
  .kafka-msg:last-child { border-bottom: none; }
  .kafka-msg.consumed {
    opacity: 0.4;
  }
  .kafka-msg.current {
    background: color-mix(in srgb, var(--accent) 10%, var(--bg));
    border-left: 2px solid var(--accent);
    padding-left: 8px;
  }
  .kafka-msg.pending {
    opacity: 0.6;
  }
  .kafka-msg-offset {
    color: var(--fg-faint);
    min-width: 14px;
    text-align: right;
    font-size: 0.6rem;
  }
  .kafka-msg-type {
    font-weight: 600;
    color: var(--fg-emphasis);
    white-space: nowrap;
  }
  .kafka-msg-detail {
    color: var(--fg-muted);
    font-size: 0.62rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .kafka-arrow {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-top: 30px;
    flex-shrink: 0;
  }
  .kafka-consumer-label {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--fg-muted);
    margin-top: 2px;
  }
  .kafka-projection {
    flex: 1;
    min-width: 0;
  }
  .kafka-section-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--fg-muted);
    margin-bottom: 4px;
  }
  .kafka-offset-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 8px;
    padding: 4px 10px;
    border-radius: 4px;
    background: var(--bg-raised);
    border: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--fg-muted);
  }
  .kafka-offset-value {
    font-weight: 700;
    color: var(--fg-emphasis);
  }