/* ==========================================================================
   DEVPEGS - Interactive Visual Concepts & Simulators Styles
   ========================================================================== */

.simulator-tabs {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.sim-tab-btn {
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s;
  font-family: var(--font-sans);
}

.sim-tab-btn.active {
  background: var(--accent-indigo);
  color: #fff;
  border-color: var(--accent-indigo);
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.sim-container {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  margin-bottom: 2rem;
}

/* Simulator Sub-Panels */
.sim-panel {
  display: none;
}
.sim-panel.active {
  display: block;
}

/* Event Loop Simulator */
.event-loop-stage {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
}

.sim-code-column {
  display: flex;
  flex-direction: column;
}

.sim-code-viewer {
  background: #050811;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.8;
  color: #cbd5e1;
  position: relative;
}

.code-line {
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  transition: background 0.2s;
}

.code-line.current-executing {
  background: rgba(99, 102, 241, 0.35);
  border-left: 3px solid var(--accent-cyan);
  color: #fff;
  font-weight: 600;
}

.sim-controls-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
}

.sim-btn {
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-md);
  border: none;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s;
  font-family: var(--font-sans);
}

.sim-btn.primary {
  background: var(--accent-indigo);
  color: #fff;
  box-shadow: 0 2px 10px rgba(99, 102, 241, 0.4);
}
.sim-btn.secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}
.sim-btn:hover {
  transform: translateY(-1px);
}

/* Event Loop Visual Architecture */
.event-loop-architecture {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto auto;
  gap: 1.25rem;
}

.runtime-box {
  background: rgba(10, 15, 30, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
}

.runtime-box-header {
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.runtime-box.stack .runtime-box-header { color: var(--accent-purple); }
.runtime-box.webapi .runtime-box-header { color: var(--accent-cyan); }
.runtime-box.microtask .runtime-box-header { color: var(--accent-amber); }
.runtime-box.macrotask .runtime-box-header { color: var(--accent-rose); }
.runtime-box.console-out .runtime-box-header { color: var(--accent-emerald); }

.token-queue {
  min-height: 80px;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  justify-content: flex-end;
}

.token-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  animation: popIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.85); }
  to { opacity: 1; transform: scale(1); }
}

.token-item.highlight-executing {
  border-color: var(--accent-indigo);
  background: rgba(99, 102, 241, 0.25);
}

.event-loop-center {
  grid-column: span 2;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem;
  background: rgba(99, 102, 241, 0.08);
  border-radius: var(--radius-md);
  border: 1px dashed rgba(99, 102, 241, 0.3);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-indigo);
  gap: 0.5rem;
}

.loop-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(99, 102, 241, 0.3);
  border-top-color: var(--accent-indigo);
  border-radius: 50%;
  animation: spin 1.5s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Flexbox / Grid Studio */
.layout-studio-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 2rem;
}

.controls-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.control-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.control-field label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.select-control {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  outline: none;
}

.canvas-preview-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.flexbox-canvas {
  background: #050811;
  border: 2px dashed rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  min-height: 280px;
  padding: 1.5rem;
  transition: all 0.3s ease;
}

.flex-sample-box {
  background: var(--grad-primary);
  color: white;
  font-weight: 700;
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.generated-css-code {
  background: #060911;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* SQL Join Visualizer */
.sql-join-stage {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}

.venn-container {
  position: relative;
  height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.venn-circle {
  width: 170px;
  height: 170px;
  border-radius: 50%;
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  opacity: 0.7;
  transition: all 0.3s;
}

.venn-circle.table-a {
  left: calc(50% - 130px);
  background: rgba(99, 102, 241, 0.45);
  border: 2px solid var(--accent-indigo);
}

.venn-circle.table-b {
  right: calc(50% - 130px);
  background: rgba(6, 182, 212, 0.45);
  border: 2px solid var(--accent-cyan);
}

.sql-data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  font-family: var(--font-mono);
}

.sql-data-table th, .sql-data-table td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-subtle);
  text-align: left;
}

.sql-data-table th {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.sql-data-table tr.matched-row {
  background: rgba(16, 185, 129, 0.2);
  color: #fff;
  font-weight: 600;
}

@media (max-width: 900px) {
  .event-loop-stage, .layout-studio-grid, .sql-join-stage {
    grid-template-columns: 1fr;
  }
}