:root {
  --primary: #5b5fde;
  --primary-hover: #4b4fbe;
  --primary-light: rgba(91, 95, 222, 0.1);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;

  --bg-body: #f8f9fb;
  --bg-card: #ffffff;
  --bg-sidebar: #1e1f2e;
  --bg-sidebar-hover: #2a2b3d;

  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --text-white: #ffffff;

  --border: #e5e7eb;
  --border-light: #f3f4f6;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 25px rgba(0,0,0,0.12);

  --sidebar-width: 260px;
  --header-height: 64px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.5;
}

/* Layout */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.app-sidebar {
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  color: var(--text-white);
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
}

.app-main {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Sidebar */
.sidebar-brand {
  padding: 20px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-brand h1 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-white);
  margin: 0;
}

.sidebar-brand span {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sidebar-nav {
  padding: 16px 12px;
  flex: 1;
  overflow-y: auto;
}

.sidebar-section-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: rgba(255,255,255,0.4);
  padding: 12px 12px 8px;
  margin-top: 8px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  margin-bottom: 2px;
}

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

.sidebar-link.active {
  background: var(--primary);
  color: var(--text-white);
}

.sidebar-link i {
  width: 20px;
  text-align: center;
  font-size: 15px;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.sidebar-user-info {
  flex: 1;
  min-width: 0;
}

.sidebar-user-name {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-plan {
  font-size: 11px;
  color: var(--text-muted);
}

/* Top header */
.app-header {
  height: var(--header-height);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

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

.app-header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
}

.mobile-menu-toggle:hover {
  background: var(--border-light);
}

/* Page content */
.page-content {
  padding: 32px;
  flex: 1;
}

.page-header {
  margin-bottom: 24px;
}

.page-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 4px;
}

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

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.card-body {
  padding: 24px;
}

/* Stats */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  text-align: center;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
}

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

/* Buttons */
.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  color: white;
}

.btn-secondary {
  background: var(--border-light);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.btn-danger {
  background: var(--danger);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
}

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

/* Badges */
.badge {
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.badge-primary {
  background: var(--primary-light);
  color: var(--primary);
}

.badge-success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

.badge-danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  font-weight: 600;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  font-size: 14px;
}

.data-table tr:hover {
  background: var(--border-light);
}

/* Notifications / Toast */
.toast-container {
  position: fixed;
  top: 80px;
  right: 24px;
  z-index: 9999;
}

.toast {
  min-width: 320px;
  padding: 16px 20px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--primary);
  margin-bottom: 8px;
  animation: slideInRight 0.3s ease;
}

.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Mobile responsive */
@media (max-width: 1024px) {
  .app-sidebar {
    transform: translateX(-100%);
  }

  .app-sidebar.open {
    transform: translateX(0);
  }

  .app-main {
    margin-left: 0;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
  }

  .sidebar-overlay.active {
    display: block;
  }

  .page-content {
    padding: 20px 16px;
  }

  .app-header {
    padding: 0 16px;
  }
}

@media (max-width: 768px) {
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-title {
    font-size: 20px;
  }
}

/* Grid helpers */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

/* Loading / empty states */
.empty-state {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-muted);
}

.empty-state i {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Skeleton loading */
.skeleton {
  background: linear-gradient(90deg, var(--border-light) 25%, #e8e8e8 50%, var(--border-light) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 4px;
}

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

.skeleton-text {
  height: 14px;
  width: 80%;
  margin-bottom: 8px;
}

.skeleton-title {
  height: 20px;
  width: 60%;
  margin-bottom: 12px;
}

.skeleton-card {
  height: 120px;
  border-radius: var(--radius-lg);
}

/* Micro-interactions */
.btn-primary, .btn-secondary, .btn-danger {
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.btn-primary:active, .btn-secondary:active, .btn-danger:active {
  transform: scale(0.97);
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.3s, height 0.3s;
}

.btn-primary:active::after {
  width: 200px;
  height: 200px;
}

/* Stat card hover animation */
.stat-card {
  transition: all 0.2s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-value {
  transition: color 0.3s;
}

/* Page transitions */
.page-content {
  animation: fadeInUp 0.3s ease;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Onboarding checklist */
.onboarding-widget {
  background: var(--bg-card);
  border: 1px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 24px;
  animation: fadeInUp 0.3s ease;
}

.onboarding-widget h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.onboarding-widget .subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.onboarding-progress {
  height: 6px;
  background: var(--border-light);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 16px;
}

.onboarding-progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 3px;
  transition: width 0.5s ease;
}

.onboarding-steps {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.onboarding-step {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  font-size: 13px;
  transition: background 0.2s;
}

.onboarding-step:hover {
  background: var(--border-light);
}

.onboarding-step .step-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  flex-shrink: 0;
}

.onboarding-step .step-icon.done {
  background: var(--success);
  color: white;
}

.onboarding-step .step-icon.pending {
  background: var(--border-light);
  border: 2px solid var(--border);
  color: var(--text-muted);
}

.onboarding-step .step-icon.active {
  background: var(--primary-light);
  border: 2px solid var(--primary);
  color: var(--primary);
}

.onboarding-step.completed {
  color: var(--text-muted);
  text-decoration: line-through;
}

.onboarding-dismiss {
  font-size: 12px;
  color: var(--text-muted);
  text-decoration: none;
  margin-top: 12px;
  display: inline-block;
}

/* Command palette */
.cmd-palette-backdrop {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 2000;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 20vh;
}

.cmd-palette-backdrop.active {
  display: flex;
}

.cmd-palette {
  width: 560px;
  max-width: 90vw;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: scaleIn 0.15s ease;
}

@keyframes scaleIn {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.cmd-palette-input {
  width: 100%;
  padding: 16px 20px;
  border: none;
  border-bottom: 1px solid var(--border);
  font-size: 16px;
  outline: none;
}

.cmd-palette-results {
  max-height: 320px;
  overflow-y: auto;
  padding: 8px;
}

.cmd-result {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 14px;
  transition: background 0.1s;
}

.cmd-result:hover, .cmd-result.selected {
  background: var(--primary-light);
}

.cmd-result i {
  width: 20px;
  color: var(--text-muted);
  text-align: center;
}

.cmd-result .label {
  flex: 1;
}

.cmd-result .shortcut {
  font-size: 11px;
  color: var(--text-muted);
  background: var(--border-light);
  padding: 2px 6px;
  border-radius: 3px;
}

/* Notification center */
.notification-bell {
  position: relative;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 18px;
  transition: color 0.2s;
}

.notification-bell:hover {
  color: var(--primary);
  background: var(--border-light);
}

.notification-badge {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 16px;
  height: 16px;
  background: var(--danger);
  color: white;
  font-size: 9px;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.notification-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  width: 360px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 500;
  display: none;
  max-height: 400px;
  overflow-y: auto;
}

.notification-dropdown.active {
  display: block;
  animation: fadeInUp 0.2s ease;
}

.notification-dropdown-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.notification-item {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  gap: 10px;
  transition: background 0.15s;
  cursor: pointer;
}

.notification-item:hover {
  background: var(--border-light);
}

.notification-item.unread {
  background: rgba(91,95,222,0.03);
}

.notification-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
  color: white;
}

.notification-text {
  font-size: 13px;
  line-height: 1.4;
}

.notification-time {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Dark mode support */
[data-theme="dark"] {
  --bg-body: #0f1117;
  --bg-card: #1a1b26;
  --bg-sidebar: #0f1117;
  --bg-sidebar-hover: #1a1b26;
  --text-primary: #e4e4e7;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --border: #27272a;
  --border-light: #1e1e24;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 25px rgba(0,0,0,0.4);
}

/* Dark mode toggle */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 16px;
  transition: color 0.2s;
}

.theme-toggle:hover {
  color: var(--primary);
  background: var(--border-light);
}