/**
 * SQL Compiler / Playground Styles
 * 3-panel layout: schema browser | editor | results
 */

/* ── Compiler layout: 2-panel vertical (editor 60%, results 40%) ────────────────────────── */
#compiler-layout {
  display: grid;
  grid-template-columns: 350px 1fr;
  grid-template-rows: 1.5fr auto 1fr;
  margin-top: calc(var(--header-h) + var(--nav-h));
  height: calc(100vh - var(--header-h) - var(--nav-h));
  overflow: hidden;
  gap: 0;
}

.resize-handle {
  grid-column: 1 / -1;
  grid-row: 2;
  height: 6px;
  background: var(--border2);
  cursor: row-resize;
  transition: background 0.2s ease;
  user-select: none;
  z-index: 100;
}

.resize-handle:hover {
  background: var(--accent);
}

/* ── Schema panel (left) ─────────────────────────────────── */
#schema-panel {
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width 0.2s ease, margin-left 0.2s ease;
  grid-row: 1 / -1;
  grid-column: 1;
  height: auto;
  min-height: 0;
}

#schema-panel.collapsed {
  width: 0;
  overflow: hidden;
  border-right: none;
}

.schema-header {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  position: relative;
}

.schema-header .schema-toggle-display-btn {
  position: absolute;
  left: 14px;
}

.schema-title-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.schema-title {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
}

.schema-name {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
  background: var(--bg3);
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

#schema-toggle {
  display: none;
}


.schema-toggle-display-btn {
  background: none;
  border: none;
  color: var(--text3);
  font-size: 11px;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: var(--transition);
  margin-right: 4px;
}

.schema-toggle-display-btn:hover {
  color: var(--accent);
  background: rgba(0, 180, 255, 0.08);
}

#schema-content {
  flex: 1;
  overflow-y: scroll !important;
  overflow-x: hidden;
  padding: 8px 8px 16px 8px;
  min-height: 0;
  -webkit-overflow-scrolling: touch;
  max-height: 265px;
  display: block;
}

/* Firefox scrollbar */
#schema-content {
  scrollbar-width: 12px;
  scrollbar-color: var(--accent) var(--bg3);
}

/* Webkit scrollbar (Chrome, Edge, Safari) */
#schema-content::-webkit-scrollbar {
  width: 80px;
}

#schema-content::-webkit-scrollbar-track {
  background: var(--bg3);
  border-radius: 6px;
}

#schema-content::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 6px;
}

#schema-content::-webkit-scrollbar-thumb:hover {
  background: var(--accent2);
}

#schema-content.hidden-schema {
  display: none;
}

.schema-table {
  margin-bottom: 2px;
}

.schema-table-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  cursor: pointer;
  transition: var(--transition);
}

.schema-table-header:hover {
  background: rgba(255, 255, 255, 0.03);
}

.schema-table-icon {
  font-size: 9px;
  color: var(--text4);
  transition: transform 0.15s;
}

.schema-table-header.open .schema-table-icon {
  transform: rotate(90deg);
}

.schema-table-name {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent2);
  flex: 1;
}

.schema-col-count {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text4);
}

.schema-cols {
  padding: 0 0 4px 28px;
}

.schema-col {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 14px 3px 0;
  font-size: 11px;
}

.schema-col-name {
  color: var(--text2);
  font-family: var(--font-mono);
  flex: 1;
}

.schema-col-type {
  color: var(--text4);
  font-family: var(--font-mono);
  font-size: 10px;
}

.schema-col-pk {
  background: rgba(0, 180, 255, 0.1);
  color: var(--accent);
  font-size: 9px;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: 3px;
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
}

.schema-loading,
.schema-error {
  padding: 16px 14px;
  font-size: 12px;
  color: var(--text3);
}

/* Mobile schema hamburger menu button */
.schema-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text2);
  cursor: pointer;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  font-family: var(--font-display);
  transition: var(--transition);
}

.schema-menu-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0, 180, 255, 0.08);
}

.schema-toggle-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text3);
  cursor: pointer;
  font-size: 14px;
  padding: 4px 8px;
  border-radius: 4px;
  transition: var(--transition);
}

.schema-toggle-btn:hover {
  color: var(--accent);
  background: rgba(0, 180, 255, 0.08);
}

/* ── Editor panel (center top) ─────────────────────────────────── */
#editor-panel {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border-right: none;
  overflow: hidden;
  grid-column: 2;
  grid-row: 1;
  transition: grid-column 0.3s ease, grid-row 0.3s ease;
}

#editor-panel.expanded {
  grid-column: 1 / -1;
  grid-row: 1 / -1;
  z-index: 1000;
}

#schema-panel.hidden,
#results-panel.hidden {
  display: none !important;
}

#editor-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 12px;
  flex-wrap: wrap;
  position: relative;
}

.editor-expand-toggle {
  background: none;
  border: none;
  color: var(--text3);
  cursor: pointer;
  font-size: 16px;
  padding: 4px 8px;
  border-radius: 4px;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.editor-expand-toggle:hover {
  color: var(--accent);
  background: rgba(0, 180, 255, 0.08);
}

.mode-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
}

.mode-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text3);
  cursor: pointer;
  user-select: none;
}

.mode-icon {
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  opacity: 0.7;
  transition: var(--transition);
}

.mode-label:hover .mode-icon {
  opacity: 1;
  color: var(--accent);
}

.mode-label input[type="checkbox"] {
  accent-color: var(--accent);
  cursor: pointer;
}

.mode-hint {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text4);
}

/* SQL editor textarea + line numbers */
#sql-editor-wrap {
  flex: 1;
  display: flex;
  overflow: hidden;
  min-height: 0;
  background: #050d1a;
}

#line-numbers {
  padding: 14px 10px 14px 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text4);
  text-align: right;
  user-select: none;
  background: #050d1a;
  border-right: 1px solid var(--border);
  min-width: 40px;
  overflow: hidden;
  flex-shrink: 0;
  white-space: pre;
}

#sql-editor {
  flex: 1;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: #a8c7fa;
  background: #050d1a;
  border: none;
  outline: none;
  resize: none;
  overflow-y: auto;
  white-space: pre;
  word-break: normal;
  caret-color: var(--accent);
  tab-size: 2;
}

/* Query hint message */
.query-hint {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: rgba(255, 214, 0, 0.08);
  border-left: 3px solid var(--accent4);
  font-size: 12px;
  color: var(--text2);
  flex-shrink: 0;
}

.query-hint.select-hint {
  background: rgba(0, 180, 255, 0.08);
  border-left-color: var(--accent);
}

.query-hint.select-hint .hint-icon {
  color: var(--accent);
}

.query-hint.select-hint .hint-text strong {
  color: var(--accent);
}

.query-hint.selected-hint {
  background: rgba(0, 255, 178, 0.08);
  border-left-color: var(--accent2);
}

.query-hint.selected-hint .hint-icon {
  color: var(--accent2);
}

.query-hint.selected-hint .hint-text strong {
  color: var(--accent2);
}

.hint-icon {
  color: var(--accent4);
  font-size: 14px;
  flex-shrink: 0;
}

.hint-text {
  flex: 1;
}

.hint-text strong {
  color: var(--accent4);
  font-weight: 600;
}

/* Editor action buttons */
#editor-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  background: var(--bg2);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.btn-run {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #000;
  font-weight: 700;
  font-size: 13px;
  padding: 7px 20px;
  border-radius: 8px;
  border: none;
  font-family: var(--font-display);
  cursor: pointer;
  transition: var(--transition);
}

.btn-run:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-run:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-run:disabled:hover::after {
  content: '';
  position: absolute;
}

/* Tooltip for disabled button */
.btn-run:disabled {
  position: relative;
}

.btn-secondary {
  background: var(--bg3);
  color: var(--text2);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 12px;
  padding: 6px 14px;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-display);
}

.btn-secondary:hover {
  border-color: var(--border2);
  color: var(--text);
}

.query-history-wrap {
  position: relative;
}

#history-dropdown {
  position: absolute;
  bottom: calc(100% + 6px);
  left: 0;
  background: var(--bg3);
  border: 1px solid var(--border2);
  border-radius: 8px;
  min-width: 320px;
  max-height: 240px;
  overflow-y: auto;
  box-shadow: var(--shadow);
  z-index: 200;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  cursor: pointer;
  transition: var(--transition);
  border-bottom: 1px solid var(--border);
  user-select: none;
}

.history-item:last-child {
  border-bottom: none;
}

.history-item:hover {
  background: rgba(0, 180, 255, 0.15);
  border-left: 2px solid var(--accent);
  padding-left: 10px;
}

.history-item:active {
  background: rgba(0, 180, 255, 0.25);
}

.history-num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text4);
  min-width: 16px;
}

.history-sql {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-empty {
  padding: 12px;
  font-size: 12px;
  color: var(--text3);
}

/* ── Results panel (bottom, full width, equal to editor) ─────────────────────────────────── */
#results-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg) 0%, var(--bg2) 100%);
  grid-column: 1 / -1;
  grid-row: 3;
  border-top: 2px solid var(--border);
  transition: grid-template-rows 0.3s ease;
}

#results-panel.collapsed {
  grid-template-rows: auto 0fr;
}

#results-panel.collapsed #results-content {
  overflow: hidden;
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
  background: linear-gradient(90deg, rgba(0,180,255,0.05), rgba(0,255,178,0.03));
}

.results-toggle-btn {
  background: none;
  border: none;
  color: var(--text3);
  font-size: 12px;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.results-toggle-btn:hover {
  color: var(--accent);
  background: rgba(0, 180, 255, 0.08);
}

.results-toggle-btn.collapsed {
  transform: rotate(-90deg);
}

.results-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--accent2);
  letter-spacing: 0.5px;
}

#results-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  font-weight: 600;
  background: rgba(0, 180, 255, 0.1);
  padding: 4px 10px;
  border-radius: 4px;
}

#results-content {
  flex: 1;
  overflow: auto;
  padding: 16px;
  background: var(--bg);
}

.results-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 12px;
}

.results-placeholder-icon {
  font-size: 32px;
  color: var(--text4);
}

.results-placeholder p {
  font-size: 13px;
  color: var(--text3);
}

/* Results table — horizontal layout with proper scrolling */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
  margin-bottom: 16px;
}

.data-table {
  width: auto;
  min-width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  font-family: var(--font-mono);
  background: var(--bg2);
  white-space: nowrap;
}

.data-table th {
  background: linear-gradient(135deg, var(--bg3), var(--bg4));
  color: var(--accent);
  padding: 14px 18px;
  text-align: left;
  border-bottom: 2px solid var(--accent);
  font-weight: 700;
  position: sticky;
  top: 0;
  left: 0;
  white-space: nowrap;
  letter-spacing: 0.5px;
  min-width: 80px;
}

.data-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 80px;
}

.data-table tbody tr {
  transition: var(--transition);
}

.data-table tbody tr:hover {
  background: rgba(0, 180, 255, 0.12);
}

.data-table tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.015);
}

.cell-null {
  color: var(--accent4);
  font-style: italic;
  font-size: 12px;
  opacity: 0.8;
}

/* Loading state */
.results-loading {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 0;
  font-size: 13px;
  color: var(--text3);
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

/* Truncation notice */
.results-truncated {
  padding: 10px 14px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--accent4);
  background: rgba(255, 214, 0, 0.12);
  border-left: 3px solid var(--accent4);
  border-radius: 4px;
  margin-bottom: 14px;
  font-weight: 600;
}

/* Success and error boxes in results */
#results-content .success-box {
  background: rgba(0, 255, 178, 0.1);
  border: 1px solid rgba(0, 255, 178, 0.3);
  border-left: 3px solid var(--accent2);
  border-radius: 6px;
  padding: 14px 16px;
}

#results-content .success-box .info-icon {
  color: var(--accent2);
  font-size: 18px;
  margin-right: 10px;
}

#results-content .success-box .info-text {
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
}

#results-content .warn-box {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-left: 3px solid #EF4444;
  border-radius: 6px;
  padding: 14px 16px;
}

#results-content .warn-box .info-icon {
  color: #EF4444;
  font-size: 18px;
  margin-right: 10px;
}

#results-content .warn-box .info-text {
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
}

/* Questions panel */
#questions-panel {
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  max-height: 280px;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

#questions-panel.collapsed {
  max-height: 44px;
}

/* .questions-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text3);
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  flex-shrink: 0;
}

.questions-header button {
  background: none;
  border: none;
  color: var(--text3);
  cursor: pointer;
  font-size: 14px;
  padding: 2px 4px;
  border-radius: 4px;
  transition: var(--transition);
}

.questions-header button:hover {
  color: var(--accent);
  background: rgba(0, 180, 255, 0.08);
} */


#questions-content {
  padding: 12px 14px;
}

#difficulty-selector {
  flex: 1;
  padding: 8px 10px 8px 10px;
  font-size: 12px;
  font-family: var(--font-mono);
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='16' height='16' fill='none' stroke='%238899aa' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 32px;
}

#difficulty-selector:hover {
  border-color: var(--border2);
}

#difficulty-selector:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 180, 255, 0.1);
}

.questions-selector-wrapper {
  display: flex;
  gap: 8px;
  align-items: center;
  position: relative;
}

#question-selector {
  flex: 1;
  padding: 8px 10px 8px 10px;
  font-size: 12px;
  font-family: var(--font-mono);
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='16' height='16' fill='none' stroke='%238899aa' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 32px;
}

.dropdown-icon {
  display: none;
}

#question-selector:hover {
  border-color: var(--border2);
}

#question-selector:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 180, 255, 0.1);
}

#question-display {
  margin-top: 12px;
  padding: 12px;
  background: rgba(0, 180, 255, 0.05);
  border: 1px solid rgba(0, 180, 255, 0.15);
  border-radius: 6px;
}

.question-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent2);
  margin-bottom: 8px;
}

.question-description {
  font-size: 12px;
  color: var(--text2);
  line-height: 1.4;
  margin-bottom: 10px;
}

.question-hint-box {
  margin: 10px 0;
}

.hint-content {
  font-size: 12px;
  background: rgba(255, 214, 0, 0.08);
  border-left: 2px solid var(--accent4);
  padding: 8px 10px;
  border-radius: 4px;
  color: var(--text2);
  line-height: 1.4;
}

#question-display .btn-secondary {
  font-size: 11px;
  padding: 5px 10px;
  margin-right: 8px;
  margin-top: 8px;
}

/* ── Responsive ────────────────────────────────────────────── */

/* Tablet: 768px - 1024px */
@media (max-width: 1100px) {
  #compiler-layout {
    grid-template-columns: 180px 1fr;
    grid-template-rows: 1.5fr auto 1fr;
  }

  #schema-panel {
    width: 180px;
  }

  #results-panel {
    flex: 1;
  }

  .questions-selector-wrapper {
    flex-wrap: wrap;
  }

  #difficulty-selector,
  #question-selector {
    font-size: 11px;
    padding: 7px 8px;
  }

  .btn-run {
    font-size: 12px;
    padding: 6px 16px;
  }
}

/* Tablet/iPad: up to 900px */
@media (max-width: 900px) {
  #compiler-layout {
    grid-template-columns: 1fr;
    grid-template-rows: 1.5fr auto 1fr;
  }

  #schema-panel {
    position: fixed;
    left: 0;
    top: calc(var(--header-h) + var(--nav-h));
    width: 280px;
    height: calc(100vh - var(--header-h) - var(--nav-h));
    background: var(--bg2);
    border-right: 1px solid var(--border);
    z-index: 999;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 2px 0 12px rgba(0, 0, 0, 0.4);
    display: flex !important;
    flex-direction: column;
    overflow: hidden;
  }

  #schema-panel.visible {
    transform: translateX(0);
  }

  #schema-panel.collapsed {
    transform: translateX(-100%);
  }

  /* Backdrop overlay when schema is open */
  @media (max-width: 900px) {
    body.schema-open::after {
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(0, 0, 0, 0.5);
      z-index: 998;
      cursor: pointer;
    }
  }

  #editor-panel {
    grid-column: 1;
    grid-row: 1;
  }

  #results-panel {
    grid-column: 1;
    grid-row: 3;
    border-top: 2px solid var(--border);
  }

  /* Show schema menu button on tablet */
  .schema-menu-btn {
    display: block;
  }

  /* Schema toggle button in header for closing */
  .schema-toggle-btn {
    display: block;
  }

  .resize-handle {
    height: 5px;
  }

  #history-dropdown {
    bottom: auto;
    top: calc(100% + 6px);
  }

  .questions-selector-wrapper {
    flex-wrap: wrap;
    gap: 6px;
  }

  #difficulty-selector,
  #question-selector {
    font-size: 11px;
    padding: 6px 8px;
  }

  #editor-expand-btn {
    font-size: 14px;
    padding: 4px 6px;
  }

  .btn-run {
    font-size: 11px;
    padding: 6px 14px;
  }

  .btn-secondary {
    font-size: 11px;
    padding: 5px 12px;
  }

  .query-hint {
    padding: 6px 12px;
    font-size: 11px;
  }
}

/* Mobile: up to 768px */
@media (max-width: 768px) {
  #compiler-layout {
    grid-template-columns: 1fr;
    grid-template-rows: 1.5fr auto 1fr;
    margin-top: calc(var(--header-h) + var(--nav-h));
  }

  #schema-panel {
    position: fixed;
    left: 0;
    top: calc(var(--header-h) + var(--nav-h));
    width: 100%;
    max-width: 280px;
    height: calc(100vh - var(--header-h) - var(--nav-h));
    z-index: 999;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    box-shadow: 2px 0 12px rgba(0, 0, 0, 0.4);
  }

  #schema-panel.visible {
    transform: translateX(0);
  }

  #schema-panel.collapsed {
    transform: translateX(-100%);
  }

  #schema-content {
    max-height: none;
  }

  #editor-panel {
    grid-column: 1;
    grid-row: 1;
  }

  #results-panel {
    grid-column: 1;
    grid-row: 3;
  }

  .schema-menu-btn {
    display: block;
  }

  .schema-toggle-btn {
    display: block;
  }

  #editor-toolbar {
    padding: 8px 12px;
    gap: 8px;
  }

  #questions-content {
    padding: 10px 12px;
  }

  .questions-selector-wrapper {
    flex-direction: column;
    gap: 6px;
  }

  #difficulty-selector,
  #question-selector {
    width: 100%;
    font-size: 11px;
    padding: 8px 8px;
  }

  #editor-expand-btn {
    width: 100%;
    font-size: 14px;
    padding: 8px 6px;
  }

  #editor-actions {
    flex-direction: column;
    gap: 6px;
    padding: 8px 12px;
  }

  .btn-run {
    width: 100%;
    font-size: 12px;
    padding: 8px 16px;
  }

  .btn-secondary {
    width: 100%;
    font-size: 11px;
    padding: 7px 12px;
  }

  .query-hint {
    padding: 6px 10px;
    font-size: 10px;
    gap: 6px;
  }

  .hint-icon {
    font-size: 12px;
  }

  .question-title {
    font-size: 12px;
  }

  .question-description {
    font-size: 11px;
  }

  #question-display .btn-secondary {
    font-size: 10px;
    padding: 5px 8px;
    width: auto;
  }

  #line-numbers {
    min-width: 30px;
    padding: 10px 8px;
    font-size: 11px;
  }

  #sql-editor {
    font-size: 11px;
    padding: 10px 12px;
  }

  .results-header {
    padding: 10px 12px;
    gap: 8px;
  }

  .results-title {
    font-size: 13px;
  }

  #results-meta {
    font-size: 10px;
    padding: 3px 8px;
  }

  .results-placeholder {
    gap: 10px;
  }

  .results-placeholder-icon {
    font-size: 28px;
  }

  .results-placeholder p {
    font-size: 12px;
  }

  .data-table {
    font-size: 11px;
  }

  .data-table th,
  .data-table td {
    padding: 10px 12px;
    font-size: 10px;
  }

  .resize-handle {
    height: 4px;
  }
}

/* Small Mobile: up to 480px */
@media (max-width: 480px) {
  #compiler-layout {
    height: calc(100vh - var(--header-h) - var(--nav-h));
  }

  #questions-content {
    padding: 8px 10px;
  }

  .questions-selector-wrapper {
    flex-direction: column;
    gap: 4px;
  }

  #difficulty-selector,
  #question-selector {
    font-size: 10px;
    padding: 7px 6px;
  }

  #editor-actions {
    padding: 6px 10px;
    gap: 4px;
  }

  .btn-run {
    font-size: 11px;
    padding: 6px 12px;
  }

  .btn-secondary {
    font-size: 10px;
    padding: 5px 10px;
  }

  .query-hint {
    padding: 5px 8px;
    font-size: 9px;
  }

  .hint-icon {
    font-size: 11px;
  }

  #line-numbers {
    min-width: 25px;
    font-size: 10px;
    padding: 8px 4px;
  }

  #sql-editor {
    font-size: 10px;
    padding: 8px 10px;
  }

  .data-table th,
  .data-table td {
    padding: 8px 10px;
    font-size: 9px;
  }

  .results-header {
    padding: 8px 10px;
  }

  .results-title {
    font-size: 12px;
  }
}