/* ═══════════════════════════════════════════════════════════════
   DSA In Depth — Simulators, Complexity Badges & Callouts CSS
   ═══════════════════════════════════════════════════════════════ */

/* Complexity Badges */
.badge-o1,
.badge-ologn,
.badge-on,
.badge-onlogn,
.badge-on2,
.badge-oexp {
  display: inline-block;
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace);
  font-size: 11.5px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  line-height: 1.4;
  white-space: nowrap;
}

.badge-o1 {
  background: rgba(16, 185, 129, 0.14);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.badge-ologn {
  background: rgba(59, 130, 246, 0.14);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.35);
}

.badge-on {
  background: rgba(139, 92, 246, 0.14);
  color: #a78bfa;
  border: 1px solid rgba(139, 92, 246, 0.35);
}

.badge-onlogn {
  background: rgba(245, 158, 11, 0.14);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.35);
}

.badge-on2 {
  background: rgba(249, 115, 22, 0.14);
  color: #fb923c;
  border: 1px solid rgba(249, 115, 22, 0.35);
}

.badge-oexp {
  background: rgba(239, 68, 68, 0.14);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.35);
}

/* Complexity Matrix Table */
.complexity-matrix {
  margin: 1.5rem 0;
  border: 1px solid var(--border-subtle, #26262a);
  border-radius: 10px;
  overflow-x: auto;
  background: var(--bg-secondary, #121215);
}

.complexity-matrix table {
  width: 100%;
  border-collapse: collapse;
  margin: 0;
  font-size: 13.5px;
}

.complexity-matrix th {
  background: rgba(255, 255, 255, 0.03);
  font-size: 11.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--fg-muted, #9ca3af);
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle, #26262a);
}

.complexity-matrix td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle, #26262a);
  vertical-align: middle;
}

.complexity-matrix tr:last-child td {
  border-bottom: none;
}

/* Invariant & Hardware Reality Callout Boxes */
.invariant-box,
.hardware-box {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-radius: 10px;
  background: var(--bg-secondary, #121215);
  border: 1px solid var(--border-subtle, #26262a);
  border-left-width: 4px;
}

.invariant-box {
  border-left-color: #6366f1;
  background: linear-gradient(90deg, rgba(99, 102, 241, 0.08) 0%, rgba(18, 18, 21, 0.4) 100%);
}

.hardware-box {
  border-left-color: #10b981;
  background: linear-gradient(90deg, rgba(16, 185, 129, 0.08) 0%, rgba(18, 18, 21, 0.4) 100%);
}

.invariant-box h4,
.hardware-box h4 {
  margin: 0 0 0.5rem 0;
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  gap: 6px;
}

.invariant-box h4 {
  color: #818cf8;
}

.hardware-box h4 {
  color: #34d399;
}

/* Interactive Visual Simulators */
.simulator-mount {
  margin: 1.75rem 0;
}

.dsa-sim {
  border: 1px solid var(--border-subtle, #27272a);
  border-radius: 12px;
  background: var(--bg-secondary, #111114);
  padding: 1.25rem;
  margin: 1.5rem 0;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.22);
}

.dsa-sim__header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.dsa-sim__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--fg-primary, #f4f4f5);
  display: flex;
  align-items: center;
  gap: 8px;
}

.dsa-sim__subtitle {
  font-size: 13px;
  color: var(--fg-muted, #a1a1aa);
  margin: 0 0 1rem 0;
  line-height: 1.5;
}

.dsa-sim__controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle, #27272a);
  border-radius: 8px;
  margin-bottom: 1rem;
}

.dsa-sim__stage {
  background: var(--bg-primary, #09090b);
  border: 1px solid var(--border-subtle, #27272a);
  border-radius: 8px;
  padding: 1rem;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.75rem;
  overflow-x: auto;
}

.dsa-sim__array {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: flex-end;
  justify-content: center;
  min-height: 90px;
  padding: 8px 4px;
}

.dsa-sim__cell {
  min-width: 42px;
  padding: 8px 6px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle, #2e2e34);
  text-align: center;
  font-family: var(--font-mono, monospace);
  font-size: 12.5px;
  transition: all 0.2s ease;
  position: relative;
}

.dsa-sim__cell.is-active {
  background: rgba(99, 102, 241, 0.22);
  border-color: #6366f1;
  color: #c7d2fe;
  transform: translateY(-3px);
}

.dsa-sim__cell.is-match,
.dsa-sim__cell.is-hit {
  background: rgba(16, 185, 129, 0.22);
  border-color: #10b981;
  color: #a7f3d0;
}

.dsa-sim__cell.is-warn,
.dsa-sim__cell.is-miss {
  background: rgba(239, 68, 68, 0.2);
  border-color: #ef4444;
  color: #fecaca;
}

.dsa-sim__cell.is-pivot {
  background: rgba(245, 158, 11, 0.22);
  border-color: #f59e0b;
  color: #fde68a;
}

.dsa-sim__cell-idx {
  display: block;
  font-size: 10px;
  color: var(--fg-faint, #71717a);
  margin-bottom: 2px;
}

.dsa-sim__cell-val {
  font-weight: 700;
  font-size: 13px;
}

.dsa-sim__cell-tag {
  display: block;
  font-size: 9.5px;
  margin-top: 2px;
  color: #818cf8;
}

.dsa-sim__metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(125px, 1fr));
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.dsa-sim__metric {
  padding: 0.6rem 0.75rem;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-subtle, #27272a);
  border-radius: 6px;
}

.dsa-sim__metric-label {
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--fg-faint, #71717a);
}

.dsa-sim__metric-value {
  font-family: var(--font-mono, monospace);
  font-size: 14px;
  font-weight: 700;
  color: var(--fg-primary, #f4f4f5);
  margin-top: 2px;
}

.dsa-sim__log {
  margin-top: 0.75rem;
  padding: 0.65rem 0.85rem;
  background: #070709;
  border: 1px solid var(--border-subtle, #27272a);
  border-radius: 6px;
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  color: #a1a1aa;
  max-height: 125px;
  overflow-y: auto;
  line-height: 1.5;
}

.dsa-sim__custom-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.75rem;
  background: rgba(99, 102, 241, 0.05);
  border: 1px solid rgba(99, 102, 241, 0.22);
  border-radius: 8px;
  margin-bottom: 0.75rem;
}

.dsa-sim__custom-label {
  font-size: 11.5px;
  font-weight: 600;
  color: #a5b4fc;
  font-family: var(--font-mono, monospace);
  white-space: nowrap;
}

.dsa-sim__custom-input {
  flex: 1 1 220px;
  min-width: 160px;
  padding: 5px 10px;
  font-size: 12.5px;
  font-family: var(--font-mono, monospace);
  color: var(--fg-primary, #f4f4f5);
  background: var(--bg-primary, #09090b);
  border: 1px solid var(--border-subtle, #3f3f46);
  border-radius: 6px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.dsa-sim__custom-input:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.25);
}

.dsa-sim__scrubber-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 0.75rem 0;
  padding: 0 0.25rem;
}

.dsa-sim__scrubber {
  flex: 1;
  height: 6px;
  accent-color: #6366f1;
  cursor: pointer;
}

.dsa-sim__audio-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  font-size: 11.5px;
  font-family: var(--font-mono, monospace);
  border-radius: 6px;
  border: 1px solid var(--border-subtle, #3f3f46);
  background: rgba(255, 255, 255, 0.03);
  color: var(--fg-muted, #a1a1aa);
  cursor: pointer;
  transition: all 0.15s ease;
}

.dsa-sim__audio-btn.is-on {
  background: rgba(16, 185, 129, 0.14);
  border-color: rgba(16, 185, 129, 0.45);
  color: #34d399;
}

.dsa-sim__audio-btn:hover {
  border-color: #6366f1;
  color: var(--fg-primary, #f4f4f5);
}

.dsa-sim__visual-canvas {
  width: 100%;
  overflow-x: auto;
  margin-bottom: 8px;
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.55) 0%, rgba(9, 9, 11, 0.75) 100%);
  padding: 8px 10px;
}

.dsa-sim__visual-canvas svg {
  width: 100%;
  display: block;
  font-family: var(--font-mono, monospace);
}

.dsa-sim__log {
  position: relative;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.dsa-sim__log.is-speaking {
  border-color: rgba(16, 185, 129, 0.55);
  box-shadow: 0 0 0 1px rgba(16, 185, 129, 0.2);
  color: #e4e4e7;
}

.dsa-sim__voice-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 7px;
  margin-right: 6px;
  border-radius: 999px;
  font-size: 10.5px;
  font-weight: 700;
  background: rgba(16, 185, 129, 0.16);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
  vertical-align: middle;
}

/* ═══════════════════════════════════════════════════════════════
   SQL In Depth — Clause-by-Clause Table-Level Visualizer & WASM SQL Runner
   ═══════════════════════════════════════════════════════════════ */

.sql-tviz {
  margin: 1.5rem 0;
  border: 1px solid var(--border-subtle, #27272a);
  border-radius: 12px;
  background: var(--bg-secondary, #111114);
  padding: 1.15rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.sql-tviz__header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.sql-tviz__title {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--fg-primary, #f4f4f5);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sql-tviz__badge {
  font-family: var(--font-mono, monospace);
  font-size: 10.5px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(16, 185, 129, 0.14);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

/* Clause Pipeline Stepper */
.sql-clause-pipeline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-subtle, #27272a);
  border-radius: 8px;
  margin-bottom: 12px;
}

.sql-clause-step {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  border-radius: 6px;
  font-family: var(--font-mono, monospace);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--fg-muted, #a1a1aa);
  background: var(--bg-primary, #09090b);
  border: 1px solid var(--border-subtle, #2e2e34);
  cursor: pointer;
  transition: all 0.18s ease;
}

.sql-clause-step:hover {
  border-color: #6366f1;
  color: var(--fg-primary, #f4f4f5);
}

.sql-clause-step.is-active {
  background: rgba(99, 102, 241, 0.22);
  border-color: #6366f1;
  color: #e0e7ff;
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.18);
}

.sql-clause-step.is-done {
  border-color: rgba(16, 185, 129, 0.45);
  color: #6ee7b7;
}

.sql-clause-step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  font-size: 10px;
  background: rgba(255, 255, 255, 0.08);
}

.sql-clause-arrow {
  color: var(--fg-faint, #52525b);
  font-size: 11px;
  user-select: none;
}

/* Relational Table Grids */
.sql-table-grid-wrap {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
  margin-bottom: 12px;
}

.sql-table-card {
  border: 1px solid var(--border-subtle, #27272a);
  border-radius: 8px;
  background: var(--bg-primary, #09090b);
  overflow: hidden;
}

.sql-table-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 11px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-subtle, #27272a);
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  font-weight: 600;
  color: var(--fg-primary, #f4f4f5);
}

.sql-table-card__meta {
  font-size: 11px;
  color: var(--fg-muted, #a1a1aa);
  font-weight: 400;
}

.sql-table-scroll {
  overflow-x: auto;
  max-height: 280px;
  overflow-y: auto;
}

.sql-rel-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono, monospace);
  font-size: 12px;
}

.sql-rel-table th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: #141418;
  color: #d4d4d8;
  font-weight: 600;
  text-align: left;
  padding: 6px 10px;
  border-bottom: 1px solid var(--border-subtle, #2e2e34);
  white-space: nowrap;
}

.sql-rel-table td {
  padding: 5px 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--fg-primary, #e4e4e7);
  white-space: nowrap;
  transition: background 0.18s ease, opacity 0.18s ease;
}

.sql-rel-table tr.row-matched td {
  background: rgba(16, 185, 129, 0.14);
  color: #d1fae5;
}

.sql-rel-table tr.row-filtered td {
  opacity: 0.35;
  text-decoration: line-through;
  background: rgba(239, 68, 68, 0.06);
}

.sql-rel-table tr.row-window-frame td {
  background: rgba(99, 102, 241, 0.16);
  border-top: 1px dashed rgba(99, 102, 241, 0.5);
  border-bottom: 1px dashed rgba(99, 102, 241, 0.5);
}

.sql-rel-table tr.row-current td {
  background: rgba(245, 158, 11, 0.2);
  color: #fef3c7;
  font-weight: 600;
}

.sql-rel-table tr.group-bucket-0 td { border-left: 3px solid #6366f1; }
.sql-rel-table tr.group-bucket-1 td { border-left: 3px solid #10b981; }
.sql-rel-table tr.group-bucket-2 td { border-left: 3px solid #f59e0b; }
.sql-rel-table tr.group-bucket-3 td { border-left: 3px solid #ec4899; }
.sql-rel-table tr.group-bucket-4 td { border-left: 3px solid #06b6d4; }

.sql-null-pill {
  display: inline-block;
  padding: 1px 5px;
  font-size: 10px;
  font-weight: 600;
  border-radius: 4px;
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.35);
  font-style: italic;
}

.sql-pk-badge,
.sql-fk-badge,
.sql-idx-badge {
  display: inline-block;
  font-size: 9.5px;
  font-weight: 700;
  padding: 1px 4px;
  border-radius: 3px;
  margin-left: 4px;
  vertical-align: middle;
}

.sql-pk-badge {
  background: rgba(245, 158, 11, 0.18);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.sql-fk-badge {
  background: rgba(59, 130, 246, 0.18);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.4);
}

.sql-idx-badge {
  background: rgba(16, 185, 129, 0.18);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

/* EXPLAIN QUERY PLAN Visual Tree */
.sql-explain-tree {
  padding: 10px 12px;
  background: rgba(15, 23, 42, 0.45);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: 8px;
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  margin-top: 8px;
}

.sql-explain-node {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  color: #e4e4e7;
}

.sql-explain-op {
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 10.5px;
  font-weight: 700;
}

.sql-explain-op--seek {
  background: rgba(16, 185, 129, 0.18);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.sql-explain-op--scan {
  background: rgba(245, 158, 11, 0.18);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.sql-explain-op--temp {
  background: rgba(239, 68, 68, 0.18);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.4);
}

/* In-Lesson Interactive SQL Code Runner Widget */
.sql-inline-workbench {
  margin: 1rem 0 1.5rem 0;
  border: 1px solid var(--border-subtle, #27272a);
  border-radius: 10px;
  background: var(--bg-secondary, #111114);
  overflow: hidden;
}

.sql-inline-workbench__toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-subtle, #27272a);
}

.sql-inline-workbench__editor {
  width: 100%;
  min-height: 92px;
  padding: 10px 12px;
  background: #09090b;
  color: #e4e4e7;
  border: none;
  border-bottom: 1px solid var(--border-subtle, #27272a);
  font-family: var(--font-mono, monospace);
  font-size: 12.5px;
  line-height: 1.55;
  resize: vertical;
  outline: none;
}

.sql-inline-workbench__output,
.sql-inline-output-slot {
  padding: 10px 12px;
}

.invariant-box__title {
  margin: 0 0 0.5rem 0;
  font-size: 13.5px;
  font-weight: 700;
  color: #818cf8;
  letter-spacing: 0.01em;
}

.sql-tviz {
  border: 1px solid var(--border-subtle, #27272a);
  border-radius: 10px;
  background: var(--bg-secondary, #111114);
  overflow: hidden;
  margin-top: 8px;
}

.sql-tviz__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-subtle, #27272a);
}

.sql-tviz__title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  color: var(--fg-primary, #f4f4f5);
}

.sql-tviz__badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  font-weight: 600;
  background: rgba(99, 102, 241, 0.16);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.35);
}

.sql-tviz__stage {
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sql-clause-pipeline {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px 14px;
  background: rgba(0, 0, 0, 0.25);
  border-bottom: 1px solid var(--border-subtle, #27272a);
}

.sql-rel-table-card {
  border: 1px solid var(--border-subtle, #27272a);
  border-radius: 8px;
  background: var(--bg-primary, #09090b);
  overflow: hidden;
}

.sql-rel-table-card__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-subtle, #27272a);
  font-size: 12px;
}

.sql-rel-table-scroll {
  overflow-x: auto;
  max-height: 290px;
  overflow-y: auto;
}

.sql-rel-table tr.is-matched td {
  background: rgba(16, 185, 129, 0.14);
  color: #d1fae5;
}

.sql-rel-table tr.is-filtered td {
  opacity: 0.38;
  text-decoration: line-through;
  background: rgba(239, 68, 68, 0.06);
}

.sql-rel-table tr.is-window-frame td {
  background: rgba(99, 102, 241, 0.16);
}

.sql-null-badge {
  display: inline-block;
  padding: 1px 5px;
  font-size: 10px;
  font-weight: 600;
  border-radius: 4px;
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.35);
  font-style: italic;
}

.col-badge--pk {
  display: inline-block;
  font-size: 9.5px;
  font-weight: 700;
  padding: 1px 4px;
  border-radius: 3px;
  margin-left: 5px;
  background: rgba(245, 158, 11, 0.18);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.sql-explain-node__badge {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 10.5px;
  font-weight: 700;
  background: rgba(99, 102, 241, 0.18);
  color: #a5b4fc;
}

.sql-explain-node__badge.is-index {
  background: rgba(16, 185, 129, 0.18);
  color: #34d399;
}

.sql-explain-node__badge.is-scan {
  background: rgba(245, 158, 11, 0.18);
  color: #fbbf24;
}