:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1c2128;
  --border: #30363d;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #4c9aed;
  --success: #3fb950;
  --success-bg: rgba(63, 185, 80, 0.15);
  --warning: #d29922;
  --warning-bg: rgba(210, 153, 34, 0.15);
  --danger: #f85149;
  --danger-bg: rgba(248, 81, 73, 0.15);
  --sidebar-width: 240px;
  --header-height: 64px;
  --radius: 12px;
  --radius-sm: 8px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

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

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 100;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  font-size: 24px;
}

.sidebar-header h1 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
}

.nav-section {
  margin-bottom: 24px;
}

.nav-label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 0 12px 8px;
  letter-spacing: 0.5px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.15s ease;
  cursor: pointer;
}

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

.nav-item.active {
  background: rgba(88, 166, 255, 0.1);
  color: var(--accent);
}

.nav-icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
}

.badge {
  margin-left: auto;
  background: var(--bg-tertiary);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}

.nav-item.active .badge {
  background: rgba(88, 166, 255, 0.2);
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border);
}

.connection-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

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

.connection-status.error {
  color: var(--danger);
}

.pulse {
  width: 8px;
  height: 8px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.connection-status.connected .pulse {
  background: var(--success);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.last-update {
  font-size: 12px;
  color: var(--text-muted);
}

/* Main Content */
.main {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
}

.main-header {
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.page-title {
  font-size: 20px;
  font-weight: 600;
}

.header-actions {
  display: flex;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
}

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

.btn-secondary:hover {
  background: var(--border);
}

/* Content */
.content {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

/* Sections */
.section {
  margin-bottom: 32px;
}

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

.section-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-secondary);
}

.section-header .count {
  font-size: 13px;
  color: var(--text-muted);
}

.section-header .hostname {
  font-size: 13px;
  color: var(--accent);
  background: rgba(88, 166, 255, 0.1);
  padding: 4px 12px;
  border-radius: 20px;
}

.section-header .link {
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
}

.section-header .link:hover {
  text-decoration: underline;
}

/* Vitals Grid */
.vitals-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.vital-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.vital-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.vital-value {
  font-size: 28px;
  font-weight: 700;
}

.vital-label {
  font-size: 13px;
  color: var(--text-secondary);
}

.vital-bar {
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
}

.vital-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.3s ease, background 0.3s ease;
}

/* Agents Grid */
.agents-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.agent-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: all 0.15s ease;
  position: relative;
}

.agent-card:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
}

.agent-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--agent-color, var(--accent));
  border-radius: var(--radius) var(--radius) 0 0;
}

.agent-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.agent-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.agent-info h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 2px;
}

.agent-info span {
  font-size: 13px;
  color: var(--text-secondary);
}

.agent-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  margin-left: auto;
}

.agent-status .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.agent-status.online .dot {
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}

.agent-status.online {
  color: var(--success);
}

.agent-stats {
  display: flex;
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.agent-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.agent-stat-value {
  font-size: 18px;
  font-weight: 600;
}

.agent-stat-label {
  font-size: 12px;
  color: var(--text-muted);
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.project-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: all 0.15s ease;
}

.project-card:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent);
}

.project-card.healthy {
  border-left: 3px solid var(--success);
}

.project-card.warning {
  border-left: 3px solid var(--warning);
}

.project-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.project-icon {
  font-size: 28px;
}

.project-info h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 2px;
}

.project-info span {
  font-size: 13px;
  color: var(--text-secondary);
}

.project-status {
  margin-left: auto;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
}

.project-status.active {
  background: var(--success-bg);
  color: var(--success);
}

.project-status.deployed {
  background: var(--success-bg);
  color: var(--success);
}

.project-status.testing {
  background: var(--warning-bg);
  color: var(--warning);
}

.project-status.error {
  background: var(--danger-bg);
  color: var(--danger);
}

.project-description {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.project-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.project-meta-row {
  display: flex;
  justify-content: space-between;
}

.project-meta-label {
  color: var(--text-muted);
}

.project-meta-value {
  color: var(--text-secondary);
}

/* Actions Grid */
.actions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}

.action-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.action-card:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent);
}

.action-icon {
  font-size: 28px;
}

.action-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Activity List */
.activity-list {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-height: 300px;
  overflow-y: auto;
}

.activity-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

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

.activity-icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
}

.activity-content {
  flex: 1;
  min-width: 0;
}

.activity-message {
  color: var(--text-primary);
}

.activity-meta {
  display: flex;
  gap: 12px;
  margin-top: 4px;
}

.activity-agent,
.activity-project {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-tertiary);
  padding: 2px 8px;
  border-radius: 4px;
}

.activity-time {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

.activity-empty {
  padding: 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}

/* Skeleton Loading */
.skeleton-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  height: 140px;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.7; }
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
}

.modal-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 480px;
  transform: scale(0.95);
  transition: transform 0.2s ease;
}

.modal-overlay.visible .modal {
  transform: scale(1);
}

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

.modal-header h3 {
  font-size: 18px;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 24px;
  cursor: pointer;
}

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

.modal-body {
  padding: 20px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}

/* Form */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.form-input,
.form-select {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--accent);
}

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

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  animation: toast-in 0.3s ease;
  min-width: 280px;
}

.toast.success {
  border-left: 3px solid var(--success);
}

.toast.error {
  border-left: 3px solid var(--danger);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .main {
    margin-left: 0;
  }
  
  .vitals-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .vitals-grid,
  .agents-grid,
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .actions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}