:root {
  --bg-app: #0a0e1a;
  --bg-panel: #0d1222;
  --bg-surface: #111828;
  --bg-editor: #050814;
  --border: #1e2640;
  --border-light: #2a3352;
  --accent: #4aa5ff;
  --accent-soft: rgba(74, 165, 255, 0.18);
  --accent-strong: #7ce7ff;
  --danger: #ff5c7a;
  --text-main: #e8ecf4;
  --text-muted: #8c95b2;
  --text-soft: #5c667e;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
  --radius: 6px;
  --radius-sm: 4px;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Courier New", monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --node-green: #2e7d32;
  --node-olive: #7c8520;
  --node-red: #b71c1c;
  --node-purple: #6a1b9a;
  --node-magenta: #ad1457;
  --node-teal: #00796b;
  --node-brown: #8d6e28;
  --node-blue: #1565c0;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-app);
  color: var(--text-main);
  height: 100vh;
  overflow: hidden;
}

/* ── App Root ── */
.app-root {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ── Top Toolbar ── */
.top-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 32px;
  min-height: 32px;
  padding: 0 8px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
}

.toolbar-left,
.toolbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.dialect-dropdown {
  height: 22px;
  padding: 0 6px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  color: var(--text-main);
  font-size: 11px;
  font-family: var(--font-sans);
  cursor: pointer;
  outline: none;
}

.dialect-dropdown:focus {
  border-color: var(--accent);
}

.dialect-dropdown option {
  background: var(--bg-panel);
}

/* ── Tabs ── */
.tab-group {
  display: flex;
  align-items: center;
  gap: 2px;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 24px;
  padding: 0 10px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  font-size: 11.5px;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

.tab-btn.active {
  background: #2e7d32;
  border-color: #43a047;
  color: #e8f5e9;
}

.tab-btn svg {
  flex-shrink: 0;
}

.diagram-tabs .tab-btn {
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  height: 30px;
  padding: 0 12px;
  font-size: 11.5px;
}

.diagram-tabs .tab-btn.active {
  background: transparent;
  border-bottom-color: var(--accent);
  color: var(--accent);
}

.diagram-tabs .tab-btn:hover {
  background: transparent;
  color: var(--text-main);
}

/* ── Main Content ── */
.main-content {
  flex: 1;
  display: flex;
  min-height: 0;
  overflow: hidden;
}

/* ── Editor Panel (Left) ── */
.editor-panel {
  width: 38%;
  min-width: 280px;
  display: flex;
  flex-direction: column;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
}

.editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 28px;
  min-height: 28px;
  padding: 0 8px;
  border-bottom: 1px solid var(--border);
  gap: 6px;
}

.editor-collapse-btn {
  flex-shrink: 0;
}

.editor-panel.collapsed .editor-shell,
.editor-panel.collapsed .editor-footer {
  display: none;
}

.editor-panel.collapsed {
  width: 40px !important;
  min-width: 40px;
}

.editor-panel.collapsed .editor-header {
  justify-content: center;
  padding: 0 4px;
}

.editor-panel.collapsed .editor-label,
.editor-panel.collapsed .editor-actions {
  display: none;
}

.editor-panel.collapsed .collapse-icon {
  display: none;
}

.editor-panel.collapsed .expand-icon {
  display: block !important;
}

.editor-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--text-main);
}

.editor-actions {
  display: flex;
  align-items: center;
  gap: 2px;
}

.ed-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.12s;
}

.ed-icon-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
}

.editor-shell {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-editor);
  min-height: 0;
}

.editor-shell .CodeMirror {
  flex: 1;
  height: 100% !important;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.45;
  background-color: var(--bg-editor);
  color: var(--text-main);
}

.editor-shell .CodeMirror-scroll {
  overflow-y: auto !important;
  overflow-x: auto !important;
}

.editor-shell .CodeMirror-gutters {
  background-color: #080c1a;
  border-right: 1px solid var(--border);
}

.editor-shell .CodeMirror-linenumber {
  color: var(--text-soft);
  padding: 0 6px 0 4px;
  font-size: 11px;
}

.editor-shell .CodeMirror-scrollbar-filler {
  background-color: transparent;
}

#sqlInput {
  display: none;
}

.editor-footer {
  height: 20px;
  min-height: 20px;
  display: flex;
  align-items: center;
  padding: 0 8px;
  border-top: 1px solid var(--border);
  background: var(--bg-panel);
}

.status-message {
  font-size: 11px;
  color: var(--text-soft);
}

.status-message.ok {
  color: #81c784;
}

.status-message.error {
  color: var(--danger);
}

/* ── Panel Divider ── */
.panel-divider {
  width: 4px;
  cursor: col-resize;
  background: var(--border);
  transition: background 0.15s;
  flex-shrink: 0;
}

.panel-divider:hover,
.panel-divider.active {
  background: var(--accent);
}

/* ── Diagram Panel (Right) ── */
.diagram-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
  background: var(--bg-panel);
}

.diagram-toolbar {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 28px;
  min-height: 28px;
  padding: 0 8px;
  border-bottom: 1px solid var(--border);
}

.dg-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.12s;
}

.dg-icon-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
}

.search-locate {
  flex: 1;
  max-width: 240px;
}

.locate-dropdown {
  width: 100%;
  height: 22px;
  padding: 0 6px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  color: var(--text-muted);
  font-size: 11px;
  font-family: var(--font-sans);
  cursor: pointer;
  outline: none;
}

.locate-dropdown:focus {
  border-color: var(--accent);
}

.locate-dropdown option {
  background: var(--bg-panel);
  color: var(--text-main);
}

/* ── Diagram Canvas ── */
.diagram-canvas {
  flex: 1;
  overflow: auto;
  position: relative;
  min-height: 0;
  background-color: #080c18;
  background-image:
    linear-gradient(rgba(30, 38, 64, 0.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 38, 64, 0.4) 1px, transparent 1px);
  background-size: 24px 24px;
}

.visual-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  font-size: 13px;
  color: var(--text-soft);
  padding: 40px;
}

/* ══════════════════════════════════════════════
   FLOWCHART NODES
   ══════════════════════════════════════════════ */

.flowchart-svg {
  display: block;
}

.flowchart-node {
  border-radius: 6px;
  overflow: hidden;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
  min-width: 130px;
  max-width: 300px;
  width: max-content;
  cursor: move;
  word-wrap: break-word;
  overflow-wrap: break-word;
  font-family: var(--font-sans);
}

.flowchart-node.dragging {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.7);
  opacity: 0.9;
}

.flowchart-node.dimmed {
  opacity: 0.3;
}

.flowchart-node-header {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px 8px;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #fff;
  background: var(--node-green);
  white-space: nowrap;
}

.flowchart-node-header.color-green { background: var(--node-green); }
.flowchart-node-header.color-olive { background: var(--node-olive); }
.flowchart-node-header.color-red { background: var(--node-red); }
.flowchart-node-header.color-purple { background: var(--node-purple); }
.flowchart-node-header.color-magenta { background: var(--node-magenta); }
.flowchart-node-header.color-teal { background: var(--node-teal); }
.flowchart-node-header.color-brown { background: var(--node-brown); }
.flowchart-node-header.color-blue { background: var(--node-blue); }

.flowchart-node-columns {
  padding: 2px 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
}

.flowchart-column {
  padding: 1px 8px;
  color: var(--text-muted);
  border-bottom: 1px solid rgba(30, 38, 64, 0.4);
  display: flex;
  align-items: center;
  gap: 5px;
  line-height: 1.4;
}

.flowchart-column:last-child {
  border-bottom: none;
}

.flowchart-column-name {
  color: #b0bec5;
}

.flowchart-column-name.pk {
  color: #81c784;
  font-weight: 500;
}

.flowchart-column-type {
  color: var(--text-soft);
  font-size: 10px;
  margin-left: auto;
}

.flowchart-column-badge {
  font-size: 9px;
  padding: 0 4px;
  border-radius: 3px;
  background: rgba(74, 165, 255, 0.2);
  border: 1px solid rgba(74, 165, 255, 0.4);
  color: var(--accent-strong);
  line-height: 1.4;
}

/* ── Connection Lines ── */
.flowchart-connection-line {
  stroke: rgba(74, 165, 255, 0.55);
  stroke-width: 1.5;
  fill: none;
  marker-end: url(#arrowhead);
  transition: stroke-width 0.15s, opacity 0.15s;
}

.flowchart-connection-line.fk {
  stroke: rgba(129, 199, 132, 0.65);
  stroke-width: 1.8;
  marker-end: url(#arrowhead-fk);
}

.flowchart-connection-line.join {
  stroke: rgba(116, 230, 255, 0.5);
  stroke-dasharray: 6, 4;
}

.flowchart-connection-line.insert {
  stroke: rgba(255, 183, 77, 0.4);
  stroke-width: 1.2;
  marker-end: url(#arrowhead-insert);
}

.flowchart-connection-line.highlighted {
  stroke-width: 2.5;
  opacity: 1;
}

.flowchart-connection-line.dimmed {
  opacity: 0.15;
}

.flowchart-port-dot {
  fill: rgba(180, 200, 255, 0.6);
}

.flowchart-label {
  font-size: 9px;
  fill: var(--text-soft);
  font-family: var(--font-sans);
}

/* ── Responsive ── */
@media (max-width: 760px) {
  .main-content {
    flex-direction: column;
  }
  .editor-panel {
    width: 100%;
    height: 40%;
    min-width: 0;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .panel-divider {
    width: 100%;
    height: 4px;
    cursor: row-resize;
  }
}