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

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #333;
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  background: white;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 30px 40px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.header h1 {
  font-size: 28px;
  font-weight: 700;
}

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

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #4ade80;
  animation: pulse 2s infinite;
}

.status-dot.offline {
  background: #ef4444;
  animation: none;
}

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

/* Buttons */
.btn {
  padding: 10px 16px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.3);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.8);
  color: white;
  border: 1px solid rgba(239, 68, 68, 1);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 1);
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 40px;
  overflow-y: auto;
}

/* Statistics Section */
.stats-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.stat-card {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all 0.3s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
  border-color: #667eea;
}

.stat-icon {
  font-size: 32px;
  flex-shrink: 0;
}

.stat-content {
  flex: 1;
}

.stat-label {
  font-size: 12px;
  font-weight: 600;
  color: #6b7280;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  color: #1f2937;
}

/* Charts Section */
.charts-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.chart-container {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 24px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.chart-container h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  color: #1f2937;
}

.chart-container canvas {
  display: block;
}

/* Recent Tips Section */
.recent-section {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 24px;
  margin-bottom: 40px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.section-header h3 {
  font-size: 18px;
  font-weight: 600;
  color: #1f2937;
}

.filter-select {
  padding: 8px 12px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  font-size: 14px;
  background: white;
  cursor: pointer;
  transition: all 0.3s ease;
}

.filter-select:hover {
  border-color: #667eea;
}

.filter-select:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Tips Table */
.tips-table-wrapper {
  overflow-x: auto;
}

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

.tips-table thead {
  background: #f9fafb;
  border-bottom: 2px solid #e5e7eb;
}

.tips-table th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 14px;
  color: #6b7280;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tips-table td {
  padding: 12px 16px;
  border-bottom: 1px solid #f3f4f6;
  font-size: 14px;
  color: #4b5563;
}

.tips-table tbody tr:hover {
  background: #f9fafb;
}

.tips-table tbody tr.empty-state:hover {
  background: white;
}

.empty-state {
  text-align: center;
  color: #9ca3af;
  font-style: italic;
  padding: 32px 16px !important;
}

/* Messages Section */
.messages-section {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 24px;
  margin-bottom: 40px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.messages-section h3 {
  font-size: 18px;
  font-weight: 600;
  color: #1f2937;
}

.message-count {
  font-size: 14px;
  color: #6b7280;
  font-weight: 500;
}

.messages-container {
  max-height: 400px;
  overflow-y: auto;
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message-item {
  padding: 12px 16px;
  background: #f9fafb;
  border-left: 3px solid #667eea;
  border-radius: 4px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #667eea;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 14px;
  flex-shrink: 0;
}

.message-content {
  flex: 1;
}

.message-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.message-username {
  font-weight: 600;
  color: #1f2937;
  font-size: 14px;
}

.message-time {
  font-size: 12px;
  color: #9ca3af;
}

.message-text {
  color: #4b5563;
  font-size: 14px;
  line-height: 1.5;
  word-break: break-word;
}

/* Footer */
.footer {
  background: #f9fafb;
  border-top: 1px solid #e5e7eb;
  padding: 20px 40px;
  text-align: center;
  font-size: 13px;
  color: #6b7280;
}

.footer p {
  margin: 4px 0;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    border-radius: 0;
    padding: 0;
  }

  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .header h1 {
    font-size: 24px;
  }

  .header-controls {
    width: 100%;
    flex-direction: column;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

  .main-content {
    padding: 20px;
  }

  .stats-section {
    grid-template-columns: 1fr;
  }

  .charts-section {
    grid-template-columns: 1fr;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .filter-select {
    width: 100%;
  }

  .tips-table {
    font-size: 12px;
  }

  .tips-table th,
  .tips-table td {
    padding: 8px 12px;
  }

  body {
    padding: 0;
  }
}

@media (max-width: 480px) {
  .header h1 {
    font-size: 20px;
  }

  .stat-icon {
    font-size: 24px;
  }

  .stat-value {
    font-size: 22px;
  }

  .stat-label {
    font-size: 11px;
  }

  .section-header h3 {
    font-size: 16px;
  }

  .main-content {
    padding: 16px;
  }

  .footer {
    padding: 16px;
    font-size: 12px;
  }
}

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

::-webkit-scrollbar-track {
  background: #f1f5f9;
  border-radius: 10px;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}