frontend/src/index.css

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:ital,wght@0,400;0,500;0,600;1,400&display=swap');

/* Color Variables and Theme Tokens */
:root {
  --bg-color: #0d0d0d;
  --surface-color: #161616;
  --surface-elevated: #1f1f1f;
  --border-color: #2c2c2c;
  --primary-color: #3b82f6;
  --primary-glow: rgba(59, 130, 246, 0.15);
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  
  --sidebar-width: 300px;
  --transition-speed: 0.2s;
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  height: 100vh;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Two-Panel Layout */
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
  background-color: var(--bg-color);
}

/* Sidebar Styles */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100%;
  background-color: var(--surface-color);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.sidebar-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  display: flex;
  align-items: center;
}

.sidebar-logo span {
  color: var(--primary-color);
  margin-left: 4px;
}

.sidebar-content {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  flex-grow: 1;
}

.divider-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  margin-top: 10px;
}

.dataset-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* Dataset Card Item */
.dataset-item {
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 12px;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-speed) ease;
  width: 100%;
  color: var(--text-primary);
}

.dataset-item:hover {
  background-color: var(--surface-elevated);
  border-color: var(--border-color);
}

.dataset-item.selected {
  background-color: var(--primary-glow);
  border-left: 3px solid var(--primary-color);
  border-top-color: transparent;
  border-right-color: transparent;
  border-bottom-color: transparent;
}

.dataset-info-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
  overflow: hidden;
  flex-grow: 1;
}

.dataset-title-row {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow: hidden;
}

.dataset-name {
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dataset-meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Badges */
.badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
}

.badge-sample {
  background-color: rgba(59, 130, 246, 0.15);
  color: var(--primary-color);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.badge-user {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--success-color);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-type {
  font-family: var(--font-mono);
  font-weight: 500;
}

.badge-type.text {
  background-color: rgba(156, 163, 175, 0.15);
  color: var(--text-secondary);
}

.badge-type.integer, .badge-type.real {
  background-color: rgba(59, 130, 246, 0.15);
  color: var(--primary-color);
}

.badge-type.date {
  background-color: rgba(167, 139, 250, 0.15);
  color: #a78bfa;
}

/* Delete Button on User Dataset Card */
.btn-delete-dataset {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-speed) ease;
}

.btn-delete-dataset:hover {
  color: var(--error-color);
  background-color: rgba(239, 68, 68, 0.1);
}

/* Main Area Container */
.main-content {
  flex-grow: 1;
  height: 100%;
  overflow-y: auto;
  padding: 32px;
  display: flex;
  flex-direction: column;
}

/* Upload & Empty View */
.empty-state-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  flex-grow: 1;
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  gap: 24px;
  width: 100%;
}

.empty-state-container h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
}

.empty-state-container p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

.drag-drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  background-color: var(--surface-color);
  padding: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  width: 100%;
}

.drag-drop-zone:hover, .drag-drop-zone.active {
  border-color: var(--primary-color);
  background-color: var(--surface-elevated);
}

.upload-icon {
  font-size: 2.5rem;
  color: var(--text-muted);
}

.drag-drop-zone:hover .upload-icon {
  color: var(--primary-color);
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--text-primary);
  border: none;
  border-radius: 6px;
  padding: 10px 18px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background-color var(--transition-speed) ease;
}

.btn-primary:hover:not(:disabled) {
  background-color: #2563eb;
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Uploading States */
.upload-status {
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  width: 100%;
  text-align: left;
}

.upload-status.uploading {
  background-color: var(--primary-glow);
  color: var(--primary-color);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.upload-status.success {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--success-color);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.upload-status.error {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--error-color);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Data Preview Layout */
.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
}

.preview-title-area {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.preview-title-area h1 {
  font-size: 1.8rem;
  font-weight: 700;
}

.preview-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.stat-badges {
  display: flex;
  gap: 12px;
  margin-top: 6px;
}

.stat-badge {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  display: flex;
  gap: 6px;
}

.stat-badge span:first-child {
  color: var(--text-secondary);
}

.stat-badge span:last-child {
  color: var(--text-primary);
  font-weight: 700;
}

/* Section Dividers */
.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  margin-top: 24px;
}

/* General Grid layout for schema */
.schema-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

/* General Tables */
.table-container {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: auto;
  background-color: var(--surface-color);
  max-width: 100%;
}

.table-preview {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  text-align: left;
}

.table-preview th {
  background-color: var(--surface-elevated);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 10;
}

.table-preview td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.table-preview tr:last-child td {
  border-bottom: none;
}

/* Zebra striping for Tables */
.table-preview tbody tr:nth-child(even) {
  background-color: #1a1a1a;
}

.table-preview tbody tr:nth-child(odd) {
  background-color: #161616;
}

/* Text alignment & Monospace for cells */
.cell-numeric {
  text-align: right !important;
}

.cell-text {
  text-align: left !important;
}

.cell-mono {
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* Query View Styles */
.query-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
  flex-grow: 1;
}

.query-input-section {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.query-input-row {
  display: flex;
  gap: 12px;
}

.query-input {
  flex-grow: 1;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  padding: 12px;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  transition: border-color var(--transition-speed) ease;
  outline: none;
}

.query-input:focus {
  border-color: var(--primary-color);
}

/* Query suggestions */
.suggestions-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.suggestion-chip {
  background-color: var(--surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: 100px;
  padding: 6px 12px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
}

.suggestion-chip:hover {
  border-color: var(--primary-color);
  color: var(--text-primary);
}

/* Main outputs of a query */
.results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 1024px) {
  .results-grid {
    grid-template-columns: 1.5fr 1fr;
  }
}

.results-left {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.results-right {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Cards for Query Outputs */
.output-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.output-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.output-card-title {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Monospace Code display */
.code-block {
  font-family: var(--font-mono);
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  padding: 16px;
  border-radius: 6px;
  color: #38bdf8; /* sky blue code color */
  font-size: 0.85rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-x: auto;
}

/* Insight Paragraph */
.insight-text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-primary);
}

/* SVG Chart Styles */
.chart-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 280px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 16px;
}

.chart-svg {
  width: 100%;
  height: 100%;
}

.chart-bar {
  fill: var(--primary-color);
  transition: fill var(--transition-speed) ease, height var(--transition-speed) ease, y var(--transition-speed) ease;
  cursor: pointer;
}

.chart-bar:hover {
  fill: #60a5fa;
}

.chart-axis-line {
  stroke: var(--border-color);
  stroke-width: 1px;
}

.chart-grid-line {
  stroke: rgba(44, 44, 44, 0.5);
  stroke-width: 1px;
  stroke-dasharray: 4;
}

.chart-text {
  fill: var(--text-secondary);
  font-size: 10px;
  font-family: var(--font-sans);
}

.chart-text-title {
  fill: var(--text-primary);
  font-size: 11px;
  font-weight: 600;
}

/* Loading animations */
.loading-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 16px;
  padding: 60px 0;
  flex-grow: 1;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Shimmer Loading placeholders */
.shimmer {
  background: linear-gradient(90deg, var(--surface-color) 25%, var(--surface-elevated) 50%, var(--surface-color) 75%);
  background-size: 200% 100%;
  animation: loading-shimmer 1.5s infinite;
}

@keyframes loading-shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* Utility buttons */
.btn-secondary {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 10px 18px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
}

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

/* Header Action View Switches */
.view-switch-tabs {
  display: flex;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 2px;
}

.view-tab {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
}

.view-tab.active {
  background-color: var(--surface-elevated);
  color: var(--text-primary);
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

/* Stats Bar */
.stats-bar {
  height: 40px;
  min-height: 40px;
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
  z-index: 100;
}

/* Toast Notification System */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 9999;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  width: 320px;
  padding: 14px 18px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  animation: slide-in 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  transition: opacity 0.3s ease;
}

.toast-success {
  background-color: #0f1c18;
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--success-color);
}

.toast-error {
  background-color: #1c1012;
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--error-color);
}

.toast-info {
  background-color: #101524;
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: var(--primary-color);
}

.toast-close-btn {
  background: transparent;
  border: none;
  color: inherit;
  opacity: 0.7;
  cursor: pointer;
  padding: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
}

.toast-close-btn:hover {
  opacity: 1;
  background-color: rgba(255, 255, 255, 0.05);
}

@keyframes slide-in {
  from {
    transform: translateX(120%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Suggestions Row Scrollbar */
.suggestions-scroll-container {
  display: flex;
  overflow-x: auto;
  width: 100%;
  gap: 8px;
  padding-bottom: 6px;
  margin-top: 4px;
}

.suggestions-scroll-container::-webkit-scrollbar {
  height: 4px;
}

.suggestions-scroll-container::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 2px;
}

/* Responsive Styles */
@media (max-width: 767px) {
  .sidebar {
    display: none !important;
  }
  
  .main-content {
    padding: 16px !important;
  }
  
  .app-container {
    flex-direction: column;
  }

  .results-grid {
    grid-template-columns: 1fr !important;
  }
  
  .preview-header {
    flex-direction: column;
    gap: 16px;
    align-items: stretch;
  }

  .stats-bar {
    padding: 0 16px;
    font-size: 0.75rem;
  }
  
  /* Reduce Chart height */
  .chart-container {
    height: 220px !important;
  }
}

@media (min-width: 768px) and (max-width: 1024px) {
  :root {
    --sidebar-width: 220px;
  }
  
  .sidebar-logo {
    font-size: 1.1rem;
  }
  
  .sidebar-content {
    padding: 12px;
  }
}