:root {
  --primary: #3b82f6;
  --primary-dark: #1e40af;
  --primary-light: #60a5fa;
  --success: #10b981;
  --success-light: #34d399;
  --danger: #ef4444;
  --danger-light: #f87171;
  --warning: #f59e0b;
  --warning-light: #fbbf24;
  --bg: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --border: #475569;
  --border-light: #64748b;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-tertiary: #cbd5e1;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.1);
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
  width: 100%;
  height: 100%;
}

body {
  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;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* Layout */
.container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.header {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(30, 41, 59, 0.8) 100%);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(4px);
}

.header-content {
  max-width: 1600px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header h1 {
  font-size: 1.8rem;
  margin-bottom: 0.25rem;
}

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

.connection-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.status-indicator {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--warning);
  animation: pulse 2s infinite;
}

.status-indicator.connected {
  background-color: var(--success);
}

.status-indicator.disconnected {
  background-color: var(--danger);
}

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

.main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.sidebar {
  width: 250px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border);
  padding: 1.5rem 0;
  overflow-y: auto;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0 1rem;
}

.nav-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  padding: 0.875rem 1rem;
  text-align: left;
  cursor: pointer;
  border-radius: 0.625rem;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-btn:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

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

.content {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
}

.view {
  display: none;
  animation: fadeIn 0.3s ease;
}

.view.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.view-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.view-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
}

.view-controls {
  display: flex;
  gap: 0.5rem;
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  padding: 0.625rem 0.875rem;
  border-radius: 0.625rem;
  cursor: pointer;
  font-size: 1rem;
  transition: var(--transition);
  font-weight: 600;
}

.btn-icon:hover {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: var(--primary-light);
  color: var(--text);
}

/* Server Grid */
.servers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.server-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 0.875rem;
  padding: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  box-shadow: var(--shadow-sm);
}

.server-card[draggable="true"] {
  cursor: grab;
}

.server-card[draggable="true"]:active {
  cursor: grabbing;
}

.server-card.dragging {
  opacity: 0.5;
  transform: scale(0.98);
}

.server-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(96, 165, 250, 0.15);
  transform: translateY(-4px);
}

.server-card.drag-over {
  border-color: var(--primary);
  background-color: rgba(59, 130, 246, 0.1);
}

.server-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: var(--warning);
  transition: background-color 0.3s ease;
}

.server-card.online::before {
  background-color: var(--success);
}

.server-card.offline::before {
  background-color: var(--danger);
}

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

.card-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.card-title h3 {
  font-size: 1.1rem;
  margin-bottom: 0.375rem;
  font-weight: 600;
  color: var(--text);
}

.card-subtitle {
  color: var(--text-secondary);
  font-size: 0.85rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}

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

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

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

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

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

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card-metric {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(71, 85, 105, 0.5);
}

.card-metric:last-child {
  border-bottom: none;
}

.metric-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.metric-value {
  font-weight: 600;
  color: var(--text);
  font-size: 0.95rem;
}

.card-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.btn-sm {
  flex: 1;
  padding: 0.625rem;
  border: 1px solid var(--border-light);
  background-color: transparent;
  color: var(--text-secondary);
  border-radius: 0.625rem;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
}

.btn-sm:hover {
  background-color: rgba(59, 130, 246, 0.1);
  border-color: var(--primary-light);
  color: var(--primary-light);
}

.btn-sm.delete:hover {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: var(--danger-light);
  color: var(--danger-light);
}

/* Forms */
.form {
  max-width: 600px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 0.875rem;
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

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

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

.form-row .form-group {
  margin-bottom: 0;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem;
  background-color: rgba(51, 65, 85, 0.5);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 0.625rem;
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-light);
  background-color: rgba(51, 65, 85, 0.8);
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.1);
}

.form-group input::placeholder {
  color: var(--text-secondary);
}

.form-group input[type='checkbox'] {
  width: auto;
  margin-right: 0.5rem;
}

.form-group label input[type='checkbox'] {
  display: flex;
  align-items: center;
  margin-bottom: 0;
}

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

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.625rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-transform: none;
  letter-spacing: 0.02em;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:active::before {
  width: 300px;
  height: 300px;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(59, 130, 246, 0.3);
}

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

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: var(--text-secondary);
}

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

.btn-danger:hover {
  background-color: #dc2626;
}

.btn-back {
  background: none;
  border: none;
  color: var(--primary);
  cursor: pointer;
  padding: 0.5rem 0;
  font-size: 1rem;
  transition: all 0.3s ease;
  margin-bottom: 1rem;
}

.btn-back:hover {
  color: var(--primary-dark);
  transform: translateX(-2px);
}

/* Detail View */
.detail-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.detail-header-top {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

#healthDetailBtn {
  padding: 0.5rem 0.75rem;
  font-size: 1.2rem;
  min-width: auto;
}

.detail-header-name {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.detail-header h2 {
  font-size: 1.8rem;
}

.detail-content {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 2rem;
}

.detail-info {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 0.875rem;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.info-group {
  margin-bottom: 1.5rem;
}

.info-group:last-child {
  margin-bottom: 0;
}

.info-group label {
  display: block;
  color: var(--text-tertiary);
  font-size: 0.8rem;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.info-group span {
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  word-break: break-all;
}

.detail-chart {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 0.875rem;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.detail-chart h3 {
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.detail-actions {
  grid-column: 1 / -1;
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

.detail-actions .btn {
  flex: 1;
}

/* Health Modal */
.health-modal-content {
  max-width: 900px;
  padding: 0;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-header h2 {
  margin: 0;
  font-size: 1.25rem;
  word-break: break-word;
  max-width: 90%;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.3s ease;
  flex-shrink: 0;
}

.modal-close:hover {
  color: var(--text);
}

.health-content {
  padding: 1.5rem 2rem;
  overflow-y: auto;
  flex: 1;
}

.health-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0.75rem;
}

.health-item {
  display: flex;
  flex-direction: column;
  padding: 1.25rem;
  background-color: rgba(51, 65, 85, 0.5);
  border-radius: 0.75rem;
  border-left: 3px solid var(--primary-light);
  gap: 0.5rem;
  box-shadow: var(--shadow-sm);
}

.health-label {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.health-server-name {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 0.5rem 0 0 0;
}

.health-value {
  color: var(--text);
  font-weight: 700;
  font-size: 1.1rem;
}

.error {
  padding: 2rem;
  text-align: center;
  color: var(--danger);
  background-color: rgba(239, 68, 68, 0.1);
  border-radius: 0.5rem;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal.active {
  display: flex;
  animation: fadeIn 0.3s ease;
}

.modal-content {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 0.875rem;
  padding: 2rem;
  max-width: 80%;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.modal-content h2 {
  margin-bottom: 1rem;
}

.modal-content p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.modal-actions {
  display: flex;
  gap: 1rem;
}

.modal-actions .btn {
  flex: 1;
}

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 1.125rem 1.5rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: 0.75rem;
  color: var(--text);
  z-index: 999;
  opacity: 0;
  transform: translateY(100px);
  transition: var(--transition);
  max-width: 400px;
  box-shadow: var(--shadow-lg);
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast.success {
  border-left-color: var(--success-light);
  background-color: rgba(16, 185, 129, 0.05);
}

.toast.error {
  border-left-color: var(--danger-light);
  background-color: rgba(239, 68, 68, 0.05);
}

.toast.warning {
  border-left-color: var(--warning-light);
  background-color: rgba(245, 158, 11, 0.05);
}

/* Loading */
.loading {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.loading::after {
  content: '';
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--primary-light);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-left: 0.75rem;
  vertical-align: middle;
}

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

/* Responsive */
@media (max-width: 768px) {
  .main {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 1rem;
  }

  .nav {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .nav-btn {
    flex: 1;
    min-width: 150px;
  }

  .content {
    padding: 1rem;
  }

  .servers-grid {
    grid-template-columns: 1fr;
  }

  .detail-content {
    grid-template-columns: 1fr;
  }

  .header-content {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }

  .form-row {
    grid-template-columns: 1fr;
  }
}