:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-light: #60a5fa;
  --secondary: #06b6d4;
  --accent: #f59e0b;
  --danger: #ef4444;
  --success: #10b981;
  --warning: #f59e0b;
  --info: #06b6d4;
  
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  
  --border: #475569;
  --border-light: #64748b;
  
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  
  --radius: 8px;
  --radius-sm: 6px;
  --radius-lg: 12px;
  --radius-xl: 16px;
}

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

body {
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

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

.main-content {
  flex: 1;
  margin-left: 280px;
  padding: 2rem;
  background: var(--bg-primary);
  min-height: 100vh;
}

/* Header */
.main-header {
  background: var(--bg-card);
  padding: 1.5rem 2rem;
  border-radius: var(--radius-lg);
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.header-content h1 {
  color: var(--text-primary);
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.welcome-text {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.header-buttons {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  margin-bottom: 2rem;
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

.card-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.card-header h2 {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0;
}

.card-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0;
}

.card-body {
  padding: 1.5rem;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.stat-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 0.25rem;
  line-height: 1;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.25rem;
}

.stat-trend {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.btn-success {
  background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
  color: white;
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(16, 185, 129, 0.3);
}

.btn-danger {
  background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
  color: white;
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(239, 68, 68, 0.3);
}

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

.btn-secondary:hover {
  background: var(--bg-secondary);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
}

.btn-icon {
  font-size: 1rem;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.badge-warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-info {
  background: rgba(6, 182, 212, 0.15);
  color: var(--info);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.form-control {
  width: 100%;
  padding: 0.875rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
  background: var(--bg-tertiary);
}

.form-text {
  display: block;
  margin-top: 0.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.form-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

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

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

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

.data-table th {
  background: var(--bg-tertiary);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: sticky;
  top: 0;
}

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

/* Alerts */
.alert {
  padding: 1rem 1.5rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  border-left: 4px solid;
  animation: slideIn 0.3s ease;
}

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

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

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

.alert-content {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.alert-icon {
  font-size: 1.2rem;
}

/* Modals */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
  backdrop-filter: blur(5px);
}

.modal-content {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 850px;
  max-height: 90vh;
  overflow-y: auto;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-xl);
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(-20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  margin: 0;
  color: var(--text-primary);
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
}

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

.modal-body {
  padding: 1.5rem;
}

/* Quick Actions */
.quick-actions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.quick-action-card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.quick-action-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.quick-action-card:hover::before {
  transform: scaleX(1);
}

.quick-action-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.action-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.action-content h3 {
  margin: 0 0 0.5rem 0;
  color: var(--text-primary);
  font-size: 1.1rem;
}

.action-content p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
}

.action-badge {
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  background: var(--primary);
  color: white;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  align-self: flex-start;
}

/* Grid Layout */
.grid-2-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

/* Empty States */
.empty-state {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: 1.5rem;
  opacity: 0.5;
}

.empty-state h3 {
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.empty-state p {
  margin-bottom: 1.5rem;
}

/* Loading States */
.loading-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-state {
  text-align: center;
  padding: 2rem;
}

/* Status Dots */
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 0.5rem;
}

.status-dot.pending { background: var(--warning); }
.status-dot.in-progress { background: var(--info); }
.status-dot.completed { background: var(--success); }
.status-dot.blocked { background: var(--danger); }

/* Progress Bars */
.progress-bar {
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 3px;
  transition: width 0.5s ease;
}

/* Task Lists */
.task-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.task-list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.task-list-item:hover {
  background: var(--bg-secondary);
  transform: translateX(5px);
}

.task-info h4 {
  margin: 0 0 0.25rem 0;
  color: var(--text-primary);
  font-size: 1rem;
}

.task-meta {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin: 0;
}

.task-status {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .grid-2-col {
    grid-template-columns: 1fr;
  }
  
  .quick-actions-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

@media (max-width: 768px) {
  .main-content {
    margin-left: 0;
    padding: 1rem;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .header-actions {
    width: 100%;
    justify-content: space-between;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .data-table {
    font-size: 0.8rem;
  }
  
  .modal-content {
    width: 95%;
    margin: 1rem;
  }
}

@media (max-width: 480px) {
  .card-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .task-list-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .task-status {
    align-self: stretch;
    justify-content: space-between;
  }
}

/* Print Styles */
@media print {
  .sidebar, .header-actions, .btn {
    display: none !important;
  }
  
  .main-content {
    margin-left: 0 !important;
  }
  
  .card {
    break-inside: avoid;
    box-shadow: none !important;
    border: 1px solid #ccc !important;
  }
  
  .stat-card {
    box-shadow: none !important;
    border: 1px solid #ccc !important;
  }
}