/* ============================================
   DATACRIT — SQL Cost Intelligence Platform
   Dark terminal aesthetic with emerald accents
   ============================================ */

:root {
  /* Core palette */
  --bg-primary: #0a0a0b;
  --bg-secondary: #111113;
  --bg-tertiary: #18181b;
  --bg-elevated: #1f1f23;
  --bg-hover: #27272a;
  
  /* Text */
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;
  --text-muted: #52525b;
  
  /* Accent */
  --accent: #10b981;
  --accent-hover: #34d399;
  --accent-muted: rgba(16, 185, 129, 0.15);
  --accent-glow: rgba(16, 185, 129, 0.4);
  
  /* Severity colors */
  --critical: #ef4444;
  --high: #f97316;
  --medium: #eab308;
  --low: #3b82f6;
  
  /* Borders */
  --border: #27272a;
  --border-focus: #3f3f46;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px var(--accent-glow);
  
  /* Typography */
  --font-sans: 'Instrument Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Spacing */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* Animation */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* Subtle grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(rgba(16, 185, 129, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 185, 129, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: -1;
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-hover);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

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

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-danger {
  background: var(--critical);
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============================================
   INPUTS
   ============================================ */

.input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.input {
  padding: 10px 14px;
  font-family: var(--font-sans);
  font-size: 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.input::placeholder {
  color: var(--text-muted);
}

.input-mono {
  font-family: var(--font-mono);
  font-size: 13px;
}

textarea.input {
  resize: vertical;
  min-height: 100px;
}

/* ============================================
   CARDS
   ============================================ */

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.card-subtitle {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-top: 2px;
}

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-brand-icon {
  width: 32px;
  height: 32px;
  background: var(--accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--bg-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 14px;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.nav-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-muted);
  border: 2px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
}

/* ============================================
   SIDEBAR LAYOUT
   ============================================ */

.layout {
  display: flex;
  flex: 1;
}

.sidebar {
  width: 260px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-section {
  margin-bottom: 24px;
}

.sidebar-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: 0 12px;
  margin-bottom: 8px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.sidebar-link:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.sidebar-link.active {
  background: var(--accent-muted);
  color: var(--accent);
}

.sidebar-link-icon {
  width: 18px;
  height: 18px;
  opacity: 0.7;
}

.sidebar-link.active .sidebar-link-icon {
  opacity: 1;
}

.main-content {
  flex: 1;
  padding: 32px;
  overflow-y: auto;
}

/* ============================================
   PAGE HEADER
   ============================================ */

.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.page-subtitle {
  font-size: 15px;
  color: var(--text-tertiary);
}

/* ============================================
   STATS GRID
   ============================================ */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.stat-label {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 4px;
}

.stat-value {
  font-size: 32px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.stat-value.accent {
  color: var(--accent);
}

.stat-change {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  margin-top: 8px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.stat-change.positive {
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent);
}

.stat-change.negative {
  background: rgba(239, 68, 68, 0.1);
  color: var(--critical);
}

/* ============================================
   TABLES
   ============================================ */

.table-container {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.table th {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-tertiary);
  background: var(--bg-tertiary);
}

.table th:first-child {
  border-radius: var(--radius-md) 0 0 0;
}

.table th:last-child {
  border-radius: 0 var(--radius-md) 0 0;
}

.table td {
  font-size: 14px;
  color: var(--text-secondary);
}

.table tbody tr:hover {
  background: var(--bg-tertiary);
}

.table-mono {
  font-family: var(--font-mono);
  font-size: 13px;
}

/* ============================================
   BADGES
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.badge-critical {
  background: rgba(239, 68, 68, 0.15);
  color: var(--critical);
}

.badge-high {
  background: rgba(249, 115, 22, 0.15);
  color: var(--high);
}

.badge-medium {
  background: rgba(234, 179, 8, 0.15);
  color: var(--medium);
}

.badge-low {
  background: rgba(59, 130, 246, 0.15);
  color: var(--low);
}

.badge-success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent);
}

.badge-neutral {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

/* ============================================
   AUTH PAGES
   ============================================ */

.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 40px;
}

.auth-header {
  text-align: center;
  margin-bottom: 32px;
}

.auth-logo {
  width: 56px;
  height: 56px;
  background: var(--accent);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--bg-primary);
  margin: 0 auto 16px;
}

.auth-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.auth-subtitle {
  font-size: 14px;
  color: var(--text-tertiary);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--text-muted);
  font-size: 13px;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.auth-footer {
  text-align: center;
  margin-top: 24px;
  font-size: 14px;
  color: var(--text-tertiary);
}

/* ============================================
   CONNECTOR SETUP
   ============================================ */

.connector-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.connector-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.connector-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.connector-card.connected {
  border-color: var(--accent);
}

.connector-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 24px;
}

.connector-icon.snowflake {
  background: linear-gradient(135deg, #29b5e8, #00d4ff);
}

.connector-icon.bigquery {
  background: linear-gradient(135deg, #4285f4, #669df6);
}

.connector-icon.redshift {
  background: linear-gradient(135deg, #8c4fff, #d06dff);
}

.connector-icon.databricks {
  background: linear-gradient(135deg, #ff3621, #ff6a4a);
}

.connector-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.connector-status {
  font-size: 13px;
  color: var(--text-tertiary);
}

.connector-status.connected {
  color: var(--accent);
}

/* ============================================
   MODAL
   ============================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transform: scale(0.95);
  transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-tertiary);
}

/* ============================================
   CODE BLOCKS
   ============================================ */

.code-block {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
  color: var(--text-secondary);
}

.code-block code {
  color: var(--accent);
}

/* ============================================
   LOADING STATES
   ============================================ */

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-tertiary) 0%,
    var(--bg-hover) 50%,
    var(--bg-tertiary) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-pulse {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================
   ALERTS / TOASTS
   ============================================ */

.alert {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
}

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

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

.alert-warning {
  background: rgba(234, 179, 8, 0.1);
  border: 1px solid rgba(234, 179, 8, 0.2);
  color: var(--medium);
}

.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 2000;
}

.toast {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 14px;
  box-shadow: var(--shadow-lg);
  animation: toast-in 0.3s ease;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   EMPTY STATES
   ============================================ */

.empty-state {
  text-align: center;
  padding: 60px 24px;
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: var(--bg-tertiary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.empty-state-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.empty-state-text {
  font-size: 14px;
  color: var(--text-tertiary);
  max-width: 400px;
  margin: 0 auto 24px;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  .sidebar {
    display: none;
  }
  
  .nav-links {
    display: none;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .auth-card {
    padding: 24px;
  }
  
  .main-content {
    padding: 16px;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }
.gap-6 { gap: 24px; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.text-center { text-align: center; }
.text-sm { font-size: 13px; }
.text-muted { color: var(--text-tertiary); }
.font-mono { font-family: var(--font-mono); }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hidden { display: none !important; }