/* ============================================================================
   NFC 4G System Dashboard - Modern CSS
   ============================================================================ */

/* Reset und Basis-Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #333;
  line-height: 1.6;
  min-height: 100vh;
}

/* Container Layout */
.container {
  display: grid;
  grid-template-columns: 1fr 300px;
  grid-template-rows: auto 1fr;
  grid-template-areas: 
    "header sidebar"
    "main sidebar";
  min-height: 100vh;
  gap: 20px;
  padding: 20px;
}

/* Header */
.header {
  grid-area: header;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 20px 30px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 15px;
}

.logo i {
  font-size: 2.5rem;
  color: #667eea;
}

.logo h1 {
  font-size: 2rem;
  font-weight: 700;
  color: #333;
  margin: 0;
}

.header-info {
  display: flex;
  align-items: center;
  gap: 30px;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.status-dot.online {
  background: #4CAF50;
}

.status-dot.offline {
  background: #f44336;
}

@keyframes pulse {
  0% { opacity: 1; }
  50% { opacity: 0.5; }
  100% { opacity: 1; }
}

.status-text {
  font-weight: 600;
  color: #333;
}

.last-update {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #666;
  font-size: 0.9rem;
}

/* Main Content */
.main-content {
  grid-area: main;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Statistics Section */
.stats-section {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 25px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.stat-card {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  border-radius: 12px;
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 15px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.stat-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
}

.stat-content h3 {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 5px;
  font-weight: 500;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: #333;
  margin-bottom: 5px;
}

.stat-change {
  font-size: 0.8rem;
  font-weight: 600;
}

.stat-change.positive {
  color: #4CAF50;
}

.stat-change.negative {
  color: #f44336;
}

.stat-change.neutral {
  color: #666;
}

/* Charts Section */
.charts-section {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 25px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.charts-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
}

.chart-card {
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.chart-header h3 {
  font-size: 1.1rem;
  color: #333;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chart-controls {
  display: flex;
  gap: 10px;
}

.btn-small {
  padding: 6px 12px;
  border: 1px solid #ddd;
  background: white;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.3s ease;
}

.btn-small:hover {
  background: #f5f5f5;
  border-color: #667eea;
}

.btn-small.active {
  background: #667eea;
  color: white;
  border-color: #667eea;
}

.chart-container {
  height: 300px;
  position: relative;
}

/* Activity Section */
.activity-section {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 25px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.activity-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.activity-header h3 {
  font-size: 1.1rem;
  color: #333;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-refresh {
  padding: 8px 16px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.3s ease;
}

.btn-refresh:hover {
  transform: scale(1.05);
}

.activity-list {
  max-height: 400px;
  overflow-y: auto;
}

.activity-item {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 15px;
  border-bottom: 1px solid #eee;
  transition: background 0.3s ease;
}

.activity-item:hover {
  background: #f8f9fa;
}

.activity-item:last-child {
  border-bottom: none;
}

.activity-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
}

.activity-content {
  flex: 1;
}

.activity-title {
  font-weight: 600;
  color: #333;
  margin-bottom: 4px;
}

.activity-time {
  font-size: 0.8rem;
  color: #666;
}

/* Devices Section */
.devices-section {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 25px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.devices-header h3 {
  font-size: 1.1rem;
  color: #333;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}

.devices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
}

.device-card {
  background: white;
  border-radius: 10px;
  padding: 15px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  border-left: 4px solid #4CAF50;
  transition: transform 0.3s ease;
}

.device-card:hover {
  transform: translateY(-3px);
}

.device-card.error {
  border-left-color: #f44336;
}

.device-card.maintenance {
  border-left-color: #ff9800;
}

.device-name {
  font-weight: 600;
  color: #333;
  margin-bottom: 8px;
}

.device-status {
  font-size: 0.8rem;
  color: #666;
  display: flex;
  align-items: center;
  gap: 5px;
}

.device-status.online {
  color: #4CAF50;
}

.device-status.offline {
  color: #f44336;
}

/* Sidebar */
.sidebar {
  grid-area: sidebar;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sidebar-section {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.sidebar-section h4 {
  font-size: 1rem;
  color: #333;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.action-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-action {
  padding: 12px 16px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.3s ease;
}

.btn-action:hover {
  transform: scale(1.02);
}

.system-info {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.info-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid #eee;
}

.info-item:last-child {
  border-bottom: none;
}

.info-label {
  font-size: 0.9rem;
  color: #666;
}

.info-value {
  font-weight: 600;
  color: #333;
}

.info-value.online {
  color: #4CAF50;
}

.info-value.offline {
  color: #f44336;
}

.notifications {
  max-height: 200px;
  overflow-y: auto;
}

.notification-item {
  padding: 10px;
  margin-bottom: 8px;
  border-radius: 8px;
  font-size: 0.8rem;
  border-left: 3px solid #667eea;
  background: #f8f9fa;
}

.notification-item.success {
  border-left-color: #4CAF50;
  background: #e8f5e8;
}

.notification-item.error {
  border-left-color: #f44336;
  background: #ffebee;
}

.notification-item.warning {
  border-left-color: #ff9800;
  background: #fff3e0;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
}

.modal-content {
  background-color: white;
  margin: 5% auto;
  padding: 0;
  border-radius: 15px;
  width: 90%;
  max-width: 500px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  padding: 20px 25px;
  border-bottom: 1px solid #eee;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-size: 1.2rem;
  color: #333;
  display: flex;
  align-items: center;
  gap: 8px;
}

.close {
  color: #aaa;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
  transition: color 0.3s ease;
}

.close:hover {
  color: #333;
}

.modal-body {
  padding: 25px;
}

.setting-group {
  margin-bottom: 20px;
}

.setting-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: #333;
}

.setting-group input[type="text"],
.setting-group input[type="number"] {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.setting-group input:focus {
  outline: none;
  border-color: #667eea;
}

.setting-group input[type="checkbox"] {
  margin-right: 8px;
}

.modal-footer {
  padding: 20px 25px;
  border-top: 1px solid #eee;
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.btn-primary:hover {
  transform: scale(1.05);
}

.btn-secondary {
  background: #f5f5f5;
  color: #333;
  border: 1px solid #ddd;
}

.btn-secondary:hover {
  background: #e9e9e9;
}

/* Loading Overlay */
.loading-overlay {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
}

.loading-spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: white;
}

.loading-spinner i {
  font-size: 3rem;
  margin-bottom: 15px;
  color: #667eea;
}

.loading-spinner p {
  font-size: 1.1rem;
  color: white;
}

/* Responsive Design */
@media (max-width: 1200px) {
  .container {
    grid-template-columns: 1fr;
    grid-template-areas: 
      "header"
      "main"
      "sidebar";
  }
  
  .sidebar {
    order: 3;
  }
  
  .charts-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 10px;
    gap: 15px;
  }
  
  .header-content {
    flex-direction: column;
    gap: 15px;
    text-align: center;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .header-info {
    flex-direction: column;
    gap: 15px;
  }
  
  .modal-content {
    width: 95%;
    margin: 10% auto;
  }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: #667eea;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #5a6fd8;
}