/* Main CSS - Global Styles and Variables */

:root {
  /* Color Palette */
  --primary-color: #0066cc;
  --primary-hover: #0052a3;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
  --info-color: #17a2b8;
  --light-color: #f8f9fa;
  --dark-color: #343a40;
  
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-dark: #2c3e50;
  --bg-card: #ffffff;
  
  /* Text Colors */
  --text-primary: #2c3e50;
  --text-secondary: #6c757d;
  --text-muted: #8e9aa8;
  --text-white: #ffffff;
  
  /* Border and Shadows */
  --border-color: #dee2e6;
  --border-radius: 8px;
  --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --box-shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
  
  /* Layout */
  --navbar-height: 64px;
  --sidebar-width: 250px;
  --max-width: 1200px;
  
  /* Animations */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  font-size: 16px;
  line-height: 1.6;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  min-height: 100vh;
}

/* Navigation */
.navbar {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
  color: var(--text-white);
  height: var(--navbar-height);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: var(--box-shadow);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 20px;
}

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

.nav-logo {
  width: 32px;
  height: 32px;
  border-radius: 4px;
}

.nav-brand h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0;
}

.nav-menu {
  flex: 1;
  margin: 0 40px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0;
}

.nav-link {
  color: var(--text-white);
  text-decoration: none;
  padding: 12px 20px;
  border-radius: var(--border-radius);
  transition: var(--transition-fast);
  font-weight: 500;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  background-color: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

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

#user-name {
  font-weight: 500;
  font-size: 0.9rem;
}

/* Main Content */
.main-content {
  margin-top: var(--navbar-height);
  min-height: calc(100vh - var(--navbar-height));
  padding: 20px 0;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  transition: var(--transition-normal);
  overflow: hidden;
}

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

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border-color);
}

.card-body {
  padding: 24px;
}

.card-footer {
  padding: 16px 24px;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border: none;
  border-radius: var(--border-radius);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-fast);
  font-size: 0.9rem;
  gap: 8px;
  min-height: 40px;
}

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

.btn-primary {
  background-color: var(--primary-color);
  color: var(--text-white);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: #5a6268;
}

.btn-success {
  background-color: var(--success-color);
  color: var(--text-white);
}

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

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover {
  background-color: var(--primary-color);
  color: var(--text-white);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
  min-height: 32px;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.1rem;
  min-height: 48px;
}

/* Grid Systems */
.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -12px;
}

.col {
  flex: 1;
  padding: 0 12px;
}

.col-2 { flex: 0 0 16.666667%; }
.col-3 { flex: 0 0 25%; }
.col-4 { flex: 0 0 33.333333%; }
.col-6 { flex: 0 0 50%; }
.col-8 { flex: 0 0 66.666667%; }
.col-9 { flex: 0 0 75%; }
.col-12 { flex: 0 0 100%; }

/* Form Elements */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  transition: var(--transition-fast);
  background-color: var(--bg-primary);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-control.error {
  border-color: var(--danger-color);
}

.form-error {
  color: var(--danger-color);
  font-size: 0.8rem;
  margin-top: 4px;
}

/* Status Indicators */
.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  gap: 6px;
}

.status-online {
  background-color: rgba(40, 167, 69, 0.1);
  color: var(--success-color);
}

.status-offline {
  background-color: rgba(220, 53, 69, 0.1);
  color: var(--danger-color);
}

.status-pending {
  background-color: rgba(255, 193, 7, 0.1);
  color: var(--warning-color);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
}

/* Loading States */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

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

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.loading-text {
  margin-top: 16px;
  color: var(--text-secondary);
  font-weight: 500;
}

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

/* Notification Container */
.notification-container {
  position: fixed;
  top: calc(var(--navbar-height) + 20px);
  right: 20px;
  z-index: 9998;
  max-width: 400px;
}

/* Footer */
.footer {
  background-color: var(--bg-dark);
  color: var(--text-white);
  text-align: center;
  padding: 20px 0;
  margin-top: 40px;
}

.footer p {
  margin: 0;
  font-size: 0.9rem;
  opacity: 0.8;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }

.hidden { display: none !important; }
.visible { display: block !important; }

.fade-in {
  opacity: 0;
  animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
  to { opacity: 1; }
}

/* Dark Theme Support */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-card: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
  }
}