/* ==========================================================================
   Diagrams — code-style architecture illustrations built from boxes and
   connectors. Pure CSS, scales with the theme.
   ========================================================================== */

.diagram {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(50rem 24rem at 50% -20%, var(--glow-1), transparent 65%),
    var(--bg-raised);
  padding: clamp(1.5rem, 1rem + 3vw, 3.5rem);
  overflow: hidden;
}

/* Faint blueprint grid inside diagrams */
.diagram::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.35;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.diagram > * { position: relative; }

/* ---- Nodes ------------------------------------------------------------------ */

.diagram__layer {
  display: grid;
  gap: var(--space-3);
  justify-items: center;
}

.diagram__nodes {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
}

.node {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-strong);
  background: var(--glass);
  backdrop-filter: blur(8px);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-strong);
  box-shadow: var(--shadow-1);
}

.node .icon { color: var(--accent-strong); }

.node--primary {
  border-color: var(--border-accent);
  background: var(--gradient-brand-soft);
  box-shadow: var(--shadow-glow);
}

.node--ghost {
  border-style: dashed;
  color: var(--text-muted);
  background: transparent;
  box-shadow: none;
}

.node--sm { padding: 0.4rem 0.85rem; font-size: var(--text-xs); }

/* ---- Connectors --------------------------------------------------------------- */

.diagram__connector {
  width: 2px;
  height: 2.4rem;
  margin-inline: auto;
  background: linear-gradient(180deg, var(--accent), transparent);
  border-radius: var(--radius-full);
  position: relative;
}

.diagram__connector::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -3px;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-top-color: var(--accent);
}

.diagram__connector--fan {
  height: 2rem;
  width: min(34rem, 80%);
  background:
    linear-gradient(var(--accent), var(--accent)) center / 2px 100% no-repeat,
    linear-gradient(90deg, var(--accent), var(--accent)) bottom / 100% 2px no-repeat;
}

.diagram__connector--fan::after { display: none; }

.diagram__caption {
  margin-top: var(--space-5);
  text-align: center;
  font-size: var(--text-xs);
  color: var(--text-faint);
}

/* ---- Flow (horizontal steps with arrows) ------------------------------------------ */

.flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
}

.flow__arrow {
  color: var(--text-faint);
  font-size: var(--text-lg);
}

@media (max-width: 47.99rem) {
  .flow { flex-direction: column; }
  .flow__arrow { transform: rotate(90deg); }
}