:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --bg-card: #141c2e;
  --bg-hover: #1e293b;
  --border-color: #27354f;
  --border-focus: #38bdf8;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --accent: #38bdf8;
  --accent-glow: rgba(56, 189, 248, 0.25);
  
  --pk-gold: #f59e0b;
  --fk-cyan: #06b6d4;
  --mn-purple: #a855f7;
  --success: #10b981;
  --danger: #ef4444;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(11, 15, 25, 0.95);
  backdrop-filter: blur(8px);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.loading-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.spinner {
  width: 44px;
  height: 44px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-text {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
}

.loading-subtext {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Header */
.app-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-badge {
  background: linear-gradient(135deg, #0284c7 0%, #6366f1 100%);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.35);
  letter-spacing: 1px;
}

.app-header h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.825rem;
  color: var(--text-muted);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.schema-select-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: var(--bg-tertiary);
  padding: 4px 10px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.schema-select-wrapper label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.schema-select {
  background: transparent;
  color: var(--accent);
  border: none;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  outline: none;
  cursor: pointer;
}

.schema-select option {
  background-color: var(--bg-secondary);
  color: var(--text-main);
}

.header-badges {
  display: flex;
  align-items: center;
  gap: 10px;
}

.badge {
  font-size: 0.725rem;
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.badge-wasm { background-color: rgba(99, 102, 241, 0.2); color: #818cf8; border: 1px solid rgba(99, 102, 241, 0.3); }
.badge-go { background-color: rgba(56, 189, 248, 0.2); color: #38bdf8; border: 1px solid rgba(56, 189, 248, 0.3); }
.badge-subtle { background-color: var(--bg-tertiary); color: var(--text-muted); border: 1px solid var(--border-color); }
.badge-link {
  background-color: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
  text-decoration: none;
  transition: all 0.2s;
}
.badge-link:hover {
  background-color: rgba(16, 185, 129, 0.3);
}

/* Presets Bar */
.presets-bar {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 8px 28px;
  display: flex;
  align-items: center;
  gap: 12px;
  overflow-x: auto;
}

.presets-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

.presets-container {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: nowrap;
}

.preset-chip {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 0.775rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.preset-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: rgba(56, 189, 248, 0.1);
}

.preset-chip.active {
  background-color: var(--primary);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 0 10px var(--accent-glow);
}

/* Main Layout */
.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 20px 28px;
  gap: 24px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0369a1 0%, #1d4ed8 100%);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.45);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  border-color: var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover {
  background-color: var(--bg-hover);
  border-color: var(--text-dim);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 0.775rem;
}

.btn-icon {
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: var(--radius-sm);
  background-color: var(--bg-tertiary);
  border-color: var(--border-color);
  color: var(--text-main);
  font-size: 1rem;
}

.btn-icon:hover {
  background-color: var(--bg-hover);
  color: var(--accent);
}

/* Diagram Section */
.diagram-section {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.diagram-toolbar {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.toolbar-left, .toolbar-center, .toolbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-title {
  font-size: 0.95rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}

.badge-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  background: var(--bg-primary);
  padding: 3px 8px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.zoom-controls {
  display: flex;
  gap: 4px;
}

.search-box input {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 5px 12px;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  outline: none;
  width: 160px;
  transition: all 0.2s;
}

.search-box input:focus {
  border-color: var(--accent);
  width: 220px;
}

.selection-counter {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 600;
}

/* Selected Fields Active Tray */
.selected-fields-tray {
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  min-height: 44px;
}

.tray-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.selected-fields-list {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  flex: 1;
}

.selected-field-pill {
  background-color: rgba(2, 132, 199, 0.25);
  border: 1px solid var(--accent);
  color: #fff;
  padding: 3px 8px;
  border-radius: 14px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

.selected-field-pill .table-prefix {
  color: var(--accent);
  font-weight: 600;
}

.selected-field-pill .remove-field-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.95rem;
  line-height: 1;
  padding: 0 2px;
  transition: color 0.15s;
}

.selected-field-pill .remove-field-btn:hover {
  color: #f87171;
}

.empty-tray-hint {
  font-size: 0.775rem;
  color: var(--text-dim);
  font-style: italic;
}

.table-selected-badge {
  background-color: var(--success);
  color: #0f172a;
  font-weight: 700;
  font-size: 0.65rem;
  padding: 1px 6px;
  border-radius: 10px;
  margin-left: 6px;
}

/* Diagram Container & SVG Canvas */
.diagram-container {
  height: 620px;
  background-color: #080c14;
  background-image: 
    radial-gradient(#1e293b 1px, transparent 1px),
    radial-gradient(#1e293b 1px, #080c14 1px);
  background-size: 24px 24px;
  background-position: 0 0, 12px 12px;
  position: relative;
  overflow: hidden;
  cursor: grab;
}

.diagram-container:active {
  cursor: grabbing;
}

.diagram-svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* Table Cards inside SVG ForeignObject */
.table-node {
  background-color: var(--bg-secondary);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  font-family: var(--font-sans);
  user-select: none;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.table-node:hover {
  border-color: var(--accent);
}

.table-node.active-table {
  border-color: var(--success);
  box-shadow: 0 0 16px rgba(16, 185, 129, 0.3);
}

.table-node.junction-table {
  border-color: var(--mn-purple);
}

.table-header {
  background: linear-gradient(180deg, #1e293b 0%, #172033 100%);
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: move;
}

.table-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 6px;
}

.table-tag {
  font-size: 0.65rem;
  font-family: var(--font-mono);
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent);
}

.table-tag-mn {
  background: rgba(168, 85, 247, 0.2);
  color: var(--mn-purple);
}

.table-columns {
  max-height: 280px;
  overflow-y: auto;
  padding: 4px 0;
}

.col-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 12px;
  font-size: 0.775rem;
  cursor: pointer;
  transition: background-color 0.15s;
  gap: 8px;
}

.col-row:hover {
  background-color: var(--bg-hover);
}

.col-row.selected {
  background-color: rgba(2, 132, 199, 0.25);
  border-left: 3px solid var(--accent);
}

.col-left {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.col-checkbox {
  cursor: pointer;
  accent-color: var(--primary);
}

.col-key-icon {
  font-size: 0.7rem;
  width: 14px;
  text-align: center;
}

.col-key-pk { color: var(--pk-gold); font-weight: bold; }
.col-key-fk { color: var(--fk-cyan); font-weight: bold; }

.col-name {
  color: var(--text-main);
  font-weight: 500;
}

.col-type {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
}

/* SVG Connectors */
.link-path {
  fill: none;
  stroke: #334155;
  stroke-width: 1.5;
  stroke-linecap: round;
  transition: stroke 0.3s, stroke-width 0.3s;
}

.link-path.active {
  stroke: var(--accent);
  stroke-width: 2.5;
  filter: drop-shadow(0 0 6px rgba(56, 189, 248, 0.6));
}

.link-path.mn-link {
  stroke-dasharray: 4, 3;
}

.link-path.mn-link.active {
  stroke: var(--mn-purple);
  filter: drop-shadow(0 0 6px rgba(168, 85, 247, 0.6));
}

/* Materialized View Section */
.view-section {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.view-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.view-title-group h2 {
  font-size: 1.35rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.view-empty-state {
  background-color: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 60px 20px;
  text-align: center;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.view-empty-state h3 {
  font-size: 1.15rem;
  color: var(--text-main);
  margin-bottom: 8px;
}

.view-error-state {
  background-color: rgba(239, 68, 68, 0.06);
  border: 1.5px dashed rgba(239, 68, 68, 0.45);
}

.view-error-state h3 {
  color: #ef4444;
}

.view-error-state p {
  color: var(--text-main);
  max-width: 640px;
  margin: 0 auto 12px auto;
  font-size: 0.9rem;
  line-height: 1.5;
}

.view-error-state .error-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto;
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 14px;
}

.metric-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 16px;
}

.metric-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
}

.text-accent {
  color: var(--accent);
}

/* Cards */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.card-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

/* Join Path Container */
.join-path-container {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.join-chip {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  gap: 6px;
}

.join-chip.root-chip {
  background-color: rgba(2, 132, 199, 0.25);
  border-color: var(--primary);
  color: #fff;
  font-weight: 600;
}

.join-arrow {
  color: var(--accent);
  font-weight: bold;
}

/* Tables */
.table-responsive {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.825rem;
  text-align: left;
}

.data-table th {
  background-color: var(--bg-secondary);
  padding: 10px 16px;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 10px 16px;
  border-bottom: 1px solid rgba(39, 53, 79, 0.5);
  color: var(--text-main);
  font-family: var(--font-sans);
}

.data-table tr:hover {
  background-color: var(--bg-hover);
}

.code-pill {
  font-family: var(--font-mono);
  background-color: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.775rem;
  color: var(--accent);
}

/* SQL Pre block */
.sql-card pre {
  padding: 18px;
  background-color: #080c14;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  color: #e2e8f0;
}

/* Drawer */
.rule-drawer {
  position: fixed;
  top: 0;
  right: -600px;
  width: 600px;
  max-width: 90vw;
  height: 100vh;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  box-shadow: -10px 0 30px rgba(0,0,0,0.6);
  z-index: 1000;
  transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.rule-drawer.open {
  right: 0;
}

.rule-drawer-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.rule-drawer-header h2 {
  font-size: 1.05rem;
  font-weight: 700;
}

.rule-drawer-content {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.drawer-description {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.5;
}

.rule-drawer pre {
  background-color: #080c14;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.5;
  color: #38bdf8;
  overflow-x: auto;
}

.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.drawer-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--accent);
  color: var(--text-main);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 2000;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}