/* ═══════════════════════════════════════════════════════
   COMMAND CENTER — Dark Mode Premium Design System
   ═══════════════════════════════════════════════════════ */

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #22223a;
  --bg-input: #16162a;
  --bg-sidebar: #0d0d15;
  --border: #2a2a40;
  --border-light: #3a3a55;
  --text-primary: #e8e8f0;
  --text-secondary: #9898b0;
  --text-muted: #6868 80;
  --accent: #6366f1;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --accent-hover: #818cf8;
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.1);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.1);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.1);
  --info: #3b82f6;
  --info-bg: rgba(59, 130, 246, 0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow: hidden;
  height: 100vh;
}

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

/* ═══ Sidebar ═══ */
.sidebar {
  width: 260px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: var(--transition);
  z-index: 100;
}

.sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid var(--border);
}

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

.logo-icon {
  font-size: 28px;
  filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.5));
}

.logo-text {
  font-size: 18px;
  font-weight: 700;
  background: linear-gradient(135deg, #6366f1, #a78bfa);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.3px;
}

.nav-menu {
  list-style: none;
  padding: 12px 8px;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 2px;
}

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

.nav-item.active {
  background: var(--accent-glow);
  color: var(--accent-hover);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.nav-icon { font-size: 18px; }

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}

.connection-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-dot.online {
  background: var(--success);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
  animation: pulse 2s infinite;
}

.status-dot.offline { background: var(--danger); }

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

/* ═══ Main Content ═══ */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.top-bar {
  display: flex;
  align-items: center;
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  gap: 16px;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 24px;
  cursor: pointer;
}

.page-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  flex: 1;
}

.current-time {
  font-size: 13px;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.content-area {
  flex: 1;
  overflow-y: auto;
  padding: 28px 32px;
  scroll-behavior: smooth;
}

.content-area::-webkit-scrollbar {
  width: 6px;
}

.content-area::-webkit-scrollbar-track {
  background: transparent;
}

.content-area::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

/* ═══ Stats Cards ═══ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.stat-card.accent::before { background: linear-gradient(90deg, #6366f1, #a78bfa); }
.stat-card.success::before { background: linear-gradient(90deg, #10b981, #34d399); }
.stat-card.warning::before { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.stat-card.info::before { background: linear-gradient(90deg, #3b82f6, #60a5fa); }

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

.stat-card .stat-icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.stat-card .stat-value {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1;
  margin-bottom: 4px;
}

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

/* ═══ Section ═══ */
.section {
  margin-bottom: 28px;
}

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

.section-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

/* ═══ Cards ═══ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: var(--transition);
}

.card:hover {
  border-color: var(--border-light);
}

/* ═══ Project Cards ═══ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

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

.project-card .project-icon {
  font-size: 36px;
  margin-bottom: 12px;
}

.project-card .project-name {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.project-card .project-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.5;
}

.progress-bar {
  height: 6px;
  background: var(--bg-input);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.5s ease;
}

.project-meta {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
}

/* ═══ Kanban Board ═══ */
.kanban-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  min-height: 400px;
}

.kanban-column {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
}

.kanban-column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.kanban-column-title {
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.kanban-count {
  background: var(--bg-card);
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  color: var(--text-muted);
}

.kanban-cards {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
}

.task-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.task-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-glow);
}

.task-card .task-title {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
}

.task-card .task-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* ═══ Badges ═══ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  gap: 4px;
}

.badge.high { background: var(--danger-bg); color: var(--danger); }
.badge.medium { background: var(--warning-bg); color: var(--warning); }
.badge.low { background: var(--info-bg); color: var(--info); }
.badge.status-online { background: var(--success-bg); color: var(--success); }
.badge.status-offline { background: var(--danger-bg); color: var(--danger); }
.badge.status-busy { background: var(--warning-bg); color: var(--warning); }

.badge.project-tag {
  border: 1px solid;
  background: transparent;
}

/* ═══ Device Cards ═══ */
.devices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.device-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}

.device-card:hover {
  border-color: var(--border-light);
}

.device-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.device-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  background: var(--bg-input);
}

.device-name {
  font-size: 16px;
  font-weight: 700;
}

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

.device-specs {
  font-size: 12px;
  color: var(--text-secondary);
  padding: 12px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

/* ═══ Activity Feed ═══ */
.activity-feed {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.activity-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.activity-item:hover {
  background: var(--bg-card);
}

.activity-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-top: 6px;
  flex-shrink: 0;
}

.activity-dot.info { background: var(--info); }
.activity-dot.success { background: var(--success); }
.activity-dot.warning { background: var(--warning); }
.activity-dot.error { background: var(--danger); }

.activity-content {
  flex: 1;
}

.activity-action {
  font-size: 13px;
  font-weight: 500;
}

.activity-details {
  font-size: 12px;
  color: var(--text-secondary);
}

.activity-time {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ═══ Buttons ═══ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  font-family: inherit;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

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

.btn-secondary:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
}

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.2);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

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

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

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

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-select {
  cursor: pointer;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* ═══ Modal ═══ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-overlay.show {
  display: flex;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.2s ease;
}

@keyframes modalIn {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

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

.modal-title {
  font-size: 17px;
  font-weight: 700;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  cursor: pointer;
  padding: 4px;
}

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

.modal-body {
  padding: 24px;
}

/* ═══ Empty State ═══ */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
}

.empty-state .empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: 0.5;
}

.empty-state .empty-text {
  font-size: 14px;
}

/* ═══ Two Column Layout ═══ */
.two-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

/* ═══ Login Screen ═══ */
.login-screen {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  width: 400px;
  max-width: 90vw;
  box-shadow: var(--shadow-lg);
}

.login-logo {
  text-align: center;
  margin-bottom: 32px;
}

.login-logo-icon {
  font-size: 48px;
  display: block;
  margin-bottom: 12px;
  filter: drop-shadow(0 0 16px rgba(99, 102, 241, 0.5));
}

.login-title {
  font-size: 24px;
  font-weight: 800;
  background: linear-gradient(135deg, #6366f1, #a78bfa);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}

.login-subtitle {
  font-size: 13px;
  color: var(--text-muted);
}

.login-error {
  color: var(--danger);
  font-size: 13px;
  margin-bottom: 12px;
  min-height: 20px;
}

/* ═══ Nav Badge ═══ */
.nav-badge {
  background: var(--danger);
  color: white;
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 10px;
  margin-left: auto;
  min-width: 18px;
  text-align: center;
}

/* ═══ Alert Button ═══ */
.alert-btn {
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
  position: relative;
  padding: 4px;
}

.alert-count {
  position: absolute;
  top: -2px;
  right: -4px;
  background: var(--danger);
  color: white;
  font-size: 9px;
  font-weight: 700;
  padding: 1px 4px;
  border-radius: 8px;
  min-width: 14px;
  text-align: center;
}

/* ═══ User Info ═══ */
.user-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

/* ═══ Approval Card ═══ */
.approval-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 12px;
  transition: var(--transition);
}

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

.approval-card.approved {
  border-left: 3px solid var(--success);
  opacity: 0.7;
}

.approval-card.rejected {
  border-left: 3px solid var(--danger);
  opacity: 0.7;
}

.approval-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.btn-approve {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.btn-approve:hover {
  background: rgba(16, 185, 129, 0.2);
}

.btn-reject {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-reject:hover {
  background: rgba(239, 68, 68, 0.2);
}

/* ═══ Audit List ═══ */
.audit-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}

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

.audit-action {
  font-weight: 600;
  min-width: 160px;
}

.audit-target {
  color: var(--text-secondary);
  flex: 1;
}

.audit-user {
  color: var(--accent);
  font-weight: 500;
}

.audit-time {
  color: var(--text-muted);
  font-size: 11px;
  white-space: nowrap;
}

/* ═══ Responsive ═══ */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -280px;
    top: 0;
    bottom: 0;
    z-index: 200;
    box-shadow: var(--shadow-lg);
  }

  .sidebar.open { left: 0; }
  .menu-toggle { display: block; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .kanban-board { grid-template-columns: 1fr; }
  .two-columns { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .devices-grid { grid-template-columns: 1fr; }
  .content-area { padding: 20px 16px; }
  .top-bar { padding: 12px 16px; }
  .form-row { grid-template-columns: 1fr; }
  .login-card { padding: 32px 24px; }
}