.playground-layout {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  position: relative;
}

.tab-content {
  display: none;
  flex: 1;
  width: 100%;
  height: 100%;
  overflow: hidden;
  flex-direction: column;
}
.tab-content.active { display: flex; }

#tab-analytics, #tab-docs {
  padding: 32px;
  overflow-y: auto;
}

.lab-grid {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 320px;
  padding: 16px;
  gap: 16px;
  overflow: hidden;
}

.lab-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto 1fr;
  gap: 16px;
  overflow-y: auto;
  padding-right: 4px; /* For scrollbar */
}

/* Scrollbar styling */
.lab-main::-webkit-scrollbar { width: 6px; }
.lab-main::-webkit-scrollbar-track { background: transparent; }
.lab-main::-webkit-scrollbar-thumb { background: var(--bg-border); border-radius: 10px; }

.canvas-card {
  grid-column: span 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-panel);
}

#lattice-canvas {
  background: #000;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  border: 4px solid var(--bg-border);
  cursor: crosshair;
}

.metrics-card {
  grid-column: span 1;
}

.chart-card-full {
  grid-column: span 2;
  min-height: 240px;
}

/* Sidebar */
.lab-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
  height: 100%;
  overflow-y: auto;
}

.control-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

select, input {
  background: var(--bg-input);
  border: 1px solid var(--bg-border);
  color: var(--text-primary);
  padding: 12px;
  border-radius: var(--radius-md);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}
select:focus, input:focus { border-color: var(--accent); }

/* Atom Selector */
.atom-selector {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.atom-option {
  background: var(--bg-input);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  padding: 16px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}
.atom-option:hover { border-color: var(--text-muted); }
.atom-option.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.atom-symbol {
  font-size: 20px;
  font-weight: 800;
  font-family: var(--mono);
}
.atom-name {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-secondary);
}

/* Property Rows */
.prop-list { display: flex; flex-direction: column; gap: 16px; }
.prop-row { display: flex; flex-direction: column; gap: 8px; }
.prop-header { display: flex; justify-content: space-between; font-size: 12px; font-weight: 700; font-family: var(--mono); }
.prop-bar-container { height: 8px; background: rgba(255,255,255,0.05); border-radius: 4px; position: relative; overflow: hidden; }
.prop-bar-fill { position: absolute; height: 100%; border-radius: 4px; transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1); }
.prop-bar-target { position: absolute; width: 2px; height: 100%; background: #fff; z-index: 5; box-shadow: 0 0 8px #fff; }

/* Log Box */
.log-box {
  flex: 1;
  background: #000;
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-border);
  padding: 12px;
  font-family: var(--mono);
  font-size: 11px;
  overflow-y: auto;
  color: var(--text-secondary);
}
.log-line { margin-bottom: 4px; display: flex; gap: 8px; }
.log-line.error { color: var(--accent-err); }
.log-line.success { color: var(--accent2); }