/**
 * chain-builder.css — Interactive SQL chain builder
 * Depends on: rho-vars.css (--r-* tokens)
 */

.interactive-demo { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.demo-panel {
  background: var(--r-bg2);
  border: 1px solid var(--r-border2);
  border-radius: 8px;
  overflow: hidden;
}
.demo-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--r-border);
  background: var(--r-surface);
}
.demo-panel-title {
  font-family: var(--r-font-mono);
  font-size: 11px;
  color: var(--r-text3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
}
.demo-panel-title .dot-lang { width: 8px; height: 8px; border-radius: 50%; background: var(--r-accent); }
.dot-lang-cyan { background: var(--r-cyan) !important; }
.demo-panel-body { padding: 20px; }
.chain-builder { display: flex; flex-direction: column; gap: 8px; }
.chain-step {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--r-surface);
  border: 1px solid var(--r-border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}
.chain-step:hover { border-color: var(--r-border2); background: var(--r-surface2); }
.chain-step.active {
  border-color: color-mix(in srgb, var(--r-accent) 40%, transparent);
  background: var(--r-accent-glow);
}
.chain-step-icon {
  font-family: var(--r-font-mono);
  font-size: 10px;
  color: var(--r-accent);
  min-width: 20px;
}
.chain-step-label { font-family: var(--r-font-mono); font-size: 12px; color: var(--r-text); }
.chain-step-hint { margin-left: auto; font-size: 11px; color: var(--r-text3); }
.chain-step.active .chain-step-hint { color: var(--r-accent); opacity: 0.7; }
.chain-connector {
  font-family: var(--r-font-mono);
  font-size: 18px;
  color: var(--r-border2);
  text-align: center;
  line-height: 1;
  margin: -4px 0;
}
.chain-connector.lit { color: var(--r-accent); opacity: 0.5; }
.sql-output {
  font-family: var(--r-font-mono);
  font-size: 12px;
  line-height: 1.9;
  min-height: 220px;
}
.sql-line { display: flex; gap: 12px; }
.sql-line-num { color: var(--r-text3); min-width: 16px; text-align: right; user-select: none; }
.sql-line-content { flex: 1; }
.sql-line.highlight .sql-line-content {
  background: color-mix(in srgb, var(--r-cyan) 7%, transparent);
  border-radius: 2px;
  padding: 0 4px;
  margin: 0 -4px;
}
.sql-compile-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--r-font-mono);
  font-size: 10px;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--r-green-dim);
  color: var(--r-green);
  border: 1px solid color-mix(in srgb, var(--r-green) 20%, transparent);
}
.pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--r-green);
  animation: chain-pulse 2s ease-in-out infinite;
}
@keyframes chain-pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

@media (max-width: 900px) {
  .interactive-demo { grid-template-columns: 1fr; }
}