/* =====================================================================
   Build-flow diagram component
   Reusable schematic strip (Jinja: components/build-flow-diagram.html)

   Same dark sub-brand as the case-study diagram system
   (diagnosis-diagram.css): fixed dark palette scoped to its own class,
   never touching :root/tokens.css. Lucide icons, thin-line/stroke-based.
   ===================================================================== */

.build-flow-diagram {
  --bf-bg: #1a1810;
  --bf-card: #221f16;
  --bf-text: #f4efe3;
  --bf-muted: #948d7c;
  --bf-border: #3a3527;
  --bf-accent: #f4efe3;
  --bf-radius: 16px;

  background: var(--bf-bg);
  color: var(--bf-text);
  border: 1px solid var(--bf-border);
  border-radius: var(--bf-radius);
  padding: var(--space-6);
  margin: var(--space-4) 0;
}

@media (min-width: 48rem) {
  .build-flow-diagram {
    padding: var(--space-8);
  }
}

.build-flow-diagram .diagram-icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 1.5;
  fill: none;
  flex-shrink: 0;
}

.build-flow-diagram .bf-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--bf-muted);
  margin: 0 0 var(--space-6);
}

.build-flow-diagram .bf-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.build-flow-diagram .bf-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4);
  position: relative;
  padding-bottom: var(--space-6);
}

.build-flow-diagram .bf-item:last-child {
  padding-bottom: 0;
}

.build-flow-diagram .bf-item:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 1.125rem;
  top: 2.5rem;
  bottom: 0;
  width: 1px;
  background: var(--bf-border);
}

.build-flow-diagram .bf-badge {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: var(--bf-card);
  border: 1px solid var(--bf-border);
  color: var(--bf-accent);
  flex-shrink: 0;
}

.build-flow-diagram .bf-number {
  position: absolute;
  bottom: -0.4rem;
  right: -0.4rem;
  width: 1.375rem;
  height: 1.375rem;
  border-radius: 50%;
  background: var(--bf-bg);
  border: 1px solid var(--bf-border);
  color: var(--bf-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  display: flex;
  align-items: center;
  justify-content: center;
}

.build-flow-diagram .bf-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-top: var(--space-1);
}

.build-flow-diagram .bf-title {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--bf-text);
}

.build-flow-diagram .bf-desc {
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  color: var(--bf-muted);
}

.build-flow-diagram .bf-arrow {
  display: none;
}

@media (min-width: 64rem) {
  .build-flow-diagram .bf-timeline {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .build-flow-diagram .bf-item {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    padding-bottom: 0;
    flex: 1;
    position: relative;
  }

  .build-flow-diagram .bf-item:not(:last-child)::before {
    content: none;
  }

  .build-flow-diagram .bf-content {
    align-items: center;
    padding-top: var(--space-2);
  }

  .build-flow-diagram .bf-arrow {
    display: block;
    position: absolute;
    top: 1.25rem;
    right: 0;
    transform: translate(50%, -50%);
    width: 1.125rem;
    height: 1.125rem;
    color: var(--bf-muted);
    flex-shrink: 0;
  }
}