/* ═══════════════════════════════════════════════════════════════════════
   query-builder.css — Interactive Query Builder Demo
   ═══════════════════════════════════════════════════════════════════════ */

.qb-root {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-elevated);
}

/* ── Tab bar ── */
.qb-tabs-bar {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
  overflow-x: auto;
}
.qb-tab {
  padding: 10px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--fg-muted);
  border: none;
  background: transparent;
  cursor: pointer;
  transition: all 150ms ease;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  letter-spacing: 0.03em;
}
.qb-tab:hover { color: var(--fg); background: var(--bg-elevated); }
.qb-tab.is-active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  background: var(--bg-elevated);
  font-weight: 600;
}

/* ── Main body: steps + SQL ── */
.qb-body {
  display: grid;
  grid-template-columns: 1fr;
}
@media (min-width: 860px) {
  .qb-body { grid-template-columns: 1fr 1fr; }
}

/* ── Steps panel (left) ── */
.qb-steps {
  padding: 16px 20px;
  border-right: 1px solid var(--border);
  min-height: 200px;
}
.qb-steps-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 14px;
}
.qb-step {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 7px 8px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 150ms ease;
  position: relative;
}
.qb-step:hover { background: var(--bg-2); }
.qb-step-toggle {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 2px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 200ms ease;
  font-size: 9px;
  color: transparent;
}
.qb-step.is-on .qb-step-toggle {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}
.qb-step.is-on .qb-step-toggle::after {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--bg);
}
.qb-step-code {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--fg);
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  white-space: pre;
}
.qb-step.is-off .qb-step-code {
  color: var(--fg-faint);
  text-decoration: line-through;
}
.qb-step-connector {
  margin-left: 26px;
  padding-left: 0;
  height: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-faint);
  line-height: 1;
  opacity: 0.4;
  transition: opacity 200ms;
}
.qb-step-connector.lit { opacity: 0.8; }
.qb-step-hint {
  display: inline-block;
  margin-left: 6px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  color: var(--fg-faint);
  background: var(--bg-2);
  padding: 1px 6px;
  border-radius: 3px;
  text-transform: uppercase;
}

/* ── SQL output panel (right) ── */
.qb-sql {
  padding: 16px 20px;
  background: var(--code-bg);
  min-height: 200px;
  position: relative;
}
.qb-sql-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--code-fg-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.qb-sql-label .qb-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-2);
  animation: qb-pulse-dot 2s ease-in-out infinite;
}
@keyframes qb-pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}
.qb-sql-pre {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--code-fg);
  white-space: pre-wrap;
  overflow-x: auto;
  min-height: 60px;
  margin: 0;
}
.qb-sql-pre .qb-sql-empty {
  color: var(--code-fg-muted);
  font-style: italic;
  opacity: 0.5;
}
.qb-sql-params {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--code-border);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--code-fg-muted);
  letter-spacing: 0.03em;
}
.qb-sql-params .qb-label {
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.6;
  margin-right: 6px;
}

/* ── Set operation chips ── */
.qb-set-chips {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  padding: 8px 0;
}
.qb-set-chip {
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  transition: all 150ms ease;
}
.qb-set-chip:hover { border-color: var(--accent); color: var(--fg); }
.qb-set-chip.is-active {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

/* ── Set operation sub-layout ── */
.qb-set-layout {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: start;
}
@media (max-width: 600px) {
  .qb-set-layout { grid-template-columns: 1fr; }
}
.qb-set-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 8px;
  min-width: 80px;
}
.qb-set-operator {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.06em;
  padding: 4px 12px;
  background: var(--accent-soft);
  border-radius: 6px;
  white-space: nowrap;
}
.qb-set-col { min-width: 0; }