@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Colors */
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.8);
  --bg-card-hover: rgba(31, 41, 55, 0.9);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-sidebar: #0d1321;
  --bg-input: rgba(255, 255, 255, 0.05);

  --accent-primary: #6366f1;
  --accent-secondary: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.3);
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);
  --accent-gradient-2: linear-gradient(135deg, #06b6d4, #3b82f6);
  --accent-gradient-3: linear-gradient(135deg, #f43f5e, #ec4899);
  --accent-gradient-4: linear-gradient(135deg, #10b981, #34d399);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #818cf8;

  --border-color: rgba(255, 255, 255, 0.06);
  --border-active: rgba(99, 102, 241, 0.4);

  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Border radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);

  /* Sidebar */
  --sidebar-width: 260px;
  --sidebar-collapsed: 72px;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* Background Effect */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 30%, rgba(99, 102, 241, 0.05) 0%, transparent 50%),
              radial-gradient(circle at 70% 70%, rgba(139, 92, 246, 0.03) 0%, transparent 50%);
  z-index: -1;
  animation: bgShift 30s ease-in-out infinite alternate;
}

@keyframes bgShift {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-5%, -5%) rotate(3deg); }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* ========== LAYOUT ========== */
.app-layout {
  display: flex;
  min-height: 100vh;
}

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

.sidebar-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.sidebar-logo {
  width: 40px;
  height: 40px;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 800;
  color: white;
  flex-shrink: 0;
}

.sidebar-title {
  display: flex;
  flex-direction: column;
}

.sidebar-title h1 {
  font-size: 1.1rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar-title span {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  overflow-y: auto;
}

.nav-section-label {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: var(--space-md) var(--space-md) var(--space-sm);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  border: 1px solid transparent;
}

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

.nav-item.active {
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-secondary);
  border-color: var(--border-active);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: -17px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
}

.nav-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  opacity: 0.8;
}

.nav-item.active .nav-icon {
  opacity: 1;
}

.sidebar-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--border-color);
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.user-info:hover {
  background: var(--bg-glass);
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: white;
  flex-shrink: 0;
}

.user-details {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-role {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-header {
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10, 14, 26, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.page-title-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
}

.page-title-section p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: var(--space-xs);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.page-content {
  flex: 1;
  padding: var(--space-xl);
}

/* ========== CARDS ========== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--border-active);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.card-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* Stat Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

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

.stat-card:nth-child(1)::before { background: var(--accent-gradient); }
.stat-card:nth-child(2)::before { background: var(--accent-gradient-2); }
.stat-card:nth-child(3)::before { background: var(--accent-gradient-3); }
.stat-card:nth-child(4)::before { background: var(--accent-gradient-4); }

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

.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  font-size: 1.3rem;
}

.stat-card:nth-child(1) .stat-icon { background: rgba(99, 102, 241, 0.15); color: #818cf8; }
.stat-card:nth-child(2) .stat-icon { background: rgba(6, 182, 212, 0.15); color: #22d3ee; }
.stat-card:nth-child(3) .stat-icon { background: rgba(244, 63, 94, 0.15); color: #fb7185; }
.stat-card:nth-child(4) .stat-icon { background: rgba(16, 185, 129, 0.15); color: #34d399; }

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Charts Grid */
.charts-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.charts-grid-equal {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.chart-container {
  position: relative;
  width: 100%;
  height: 300px;
}

/* Data Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table thead th {
  text-align: left;
  padding: var(--space-md) var(--space-lg);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
}

.data-table tbody tr {
  transition: background var(--transition-fast);
  cursor: pointer;
}

.data-table tbody tr:hover {
  background: var(--bg-glass);
}

.data-table tbody td {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.data-table tbody td:first-child {
  color: var(--text-primary);
  font-weight: 500;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge-success { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.badge-danger { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.badge-info { background: rgba(59, 130, 246, 0.15); color: var(--info); }
.badge-neutral { background: rgba(100, 116, 139, 0.15); color: var(--text-secondary); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  font-family: inherit;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  border: none;
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow), 0 4px 12px rgba(99, 102, 241, 0.4);
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  border-color: var(--border-active);
  background: rgba(255, 255, 255, 0.06);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
}

/* Input */
.input-group {
  margin-bottom: var(--space-lg);
}

.input-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.input-group input, .input-group select {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color var(--transition-fast);
  outline: none;
}

.input-group input:focus, .input-group select:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

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

/* Search */
.search-bar {
  position: relative;
  max-width: 320px;
}

.search-bar input {
  width: 100%;
  padding: var(--space-sm) var(--space-md) var(--space-sm) 40px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: inherit;
  outline: none;
  transition: all var(--transition-fast);
}

.search-bar input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-bar svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-muted);
}

/* ========== MODAL ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

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

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  width: 90%;
  max-width: 480px;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-base);
  box-shadow: var(--shadow-lg);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.modal-logo {
  width: 56px;
  height: 56px;
  background: var(--accent-gradient);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin: 0 auto var(--space-lg);
  box-shadow: var(--shadow-glow);
}

.modal-header h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.modal-header p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.modal-footer {
  margin-top: var(--space-lg);
}

.modal-footer .btn {
  width: 100%;
  padding: var(--space-md);
}

.modal-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-top: var(--space-md);
  font-size: 0.8rem;
  color: var(--danger);
  display: none;
}

.modal-error.show {
  display: block;
}

/* ========== LOADING ========== */
.loading-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl);
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-lg);
  z-index: 2000;
  transition: opacity var(--transition-slow);
}

.loading-overlay.fade-out {
  opacity: 0;
  pointer-events: none;
}

.loading-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* ========== EMPTY STATE ========== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--space-lg);
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.empty-state p {
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 400px;
}

/* ========== GRID LAYOUTS ========== */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
}

.course-card:hover {
  border-color: var(--border-active);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.course-card-banner {
  height: 8px;
  position: relative;
}

.course-card-banner::after {
  content: '';
  position: absolute;
  inset: 0;
}

.course-card:nth-child(4n+1) .course-card-banner { background: var(--accent-gradient); }
.course-card:nth-child(4n+2) .course-card-banner { background: var(--accent-gradient-2); }
.course-card:nth-child(4n+3) .course-card-banner { background: var(--accent-gradient-3); }
.course-card:nth-child(4n+4) .course-card-banner { background: var(--accent-gradient-4); }

.course-card-body {
  padding: var(--space-lg);
}

.course-card-body h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card-code {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
  font-weight: 500;
}

.course-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.course-card-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Student list */
.student-list {
  display: flex;
  flex-direction: column;
}

.student-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-fast);
}

.student-row:hover {
  background: var(--bg-glass);
}

.student-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: white;
  flex-shrink: 0;
}

.student-info {
  flex: 1;
  min-width: 0;
}

.student-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.student-email {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Filter bar */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.filter-select {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: inherit;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-fast);
  min-width: 180px;
}

.filter-select:focus {
  border-color: var(--accent-primary);
}

.filter-select option {
  background: var(--bg-secondary);
}

/* ========== ANIMATIONS ========== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.4s ease-out forwards;
}

.animate-in:nth-child(1) { animation-delay: 0ms; }
.animate-in:nth-child(2) { animation-delay: 60ms; }
.animate-in:nth-child(3) { animation-delay: 120ms; }
.animate-in:nth-child(4) { animation-delay: 180ms; }
.animate-in:nth-child(5) { animation-delay: 240ms; }
.animate-in:nth-child(6) { animation-delay: 300ms; }

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .charts-grid {
    grid-template-columns: 1fr;
  }
  .charts-grid-equal {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar {
    width: var(--sidebar-collapsed);
  }
  .sidebar-title, .nav-item span, .nav-section-label, .user-details {
    display: none;
  }
  .main-content {
    margin-left: var(--sidebar-collapsed);
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .courses-grid {
    grid-template-columns: 1fr;
  }
  .page-content {
    padding: var(--space-md);
  }
}

/* Tooltip */
[data-tooltip] {
  position: relative;
}
[data-tooltip]:hover::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  color: var(--text-primary);
  white-space: nowrap;
  z-index: 999;
}

/* Tab system */
.tabs {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-xl);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0;
}

.tab {
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  margin-bottom: -1px;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
  font-family: inherit;
}

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

.tab.active {
  color: var(--accent-secondary);
  border-bottom-color: var(--accent-primary);
}

/* Progress bar */
.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-input);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  transition: width var(--transition-slow);
}

/* Status dot */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  margin-right: var(--space-sm);
}

.status-dot.active { background: var(--success); box-shadow: 0 0 6px var(--success); }
.status-dot.completed { background: var(--info); }
.status-dot.inactive { background: var(--text-muted); }

/* ========== THEME TRANSITION ========== */
html {
  transition: background-color 0.3s ease, color 0.3s ease;
}

html[data-theme="light"] body,
html[data-theme="light"] .loading-overlay {
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ========== LIGHT THEME ========== */
[data-theme="light"] {
  --bg-primary: #f5f7fb;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: rgba(245, 247, 251, 0.95);
  --bg-glass: rgba(0, 0, 0, 0.02);
  --bg-sidebar: #ffffff;
  --bg-input: rgba(0, 0, 0, 0.04);

  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-accent: #6366f1;

  --border-color: rgba(0, 0, 0, 0.08);
  --border-active: rgba(99, 102, 241, 0.35);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.1);
}

[data-theme="light"] body::before {
  background: radial-gradient(circle at 30% 30%, rgba(99, 102, 241, 0.04) 0%, transparent 50%),
              radial-gradient(circle at 70% 70%, rgba(139, 92, 246, 0.02) 0%, transparent 50%);
}

[data-theme="light"] .main-header {
  background: rgba(255, 255, 255, 0.85);
}

[data-theme="light"] .sidebar {
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.04);
}

[data-theme="light"] .sidebar-title h1 {
  -webkit-text-fill-color: initial;
  background: none;
  color: var(--accent-primary);
}

[data-theme="light"] .filter-select option {
  background: #ffffff;
}

/* ========== THEME TOGGLE BUTTON ========== */
.theme-toggle {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  font-size: 1.1rem;
  line-height: 1;
}

.theme-toggle:hover {
  border-color: var(--border-active);
  transform: rotate(15deg) scale(1.05);
}

.theme-toggle-icon {
  transition: transform 0.3s ease;
}

/* Floating toggle for login page */
.theme-toggle-float {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 100;
}


/* ========== AUTOMATION HUB ========== */
.automation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-md);
}

.automation-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.automation-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(circle at top right, rgba(255,255,255,0.03), transparent 70%);
  pointer-events: none;
}

.automation-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-active);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
}

.auto-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.auto-icon svg {
  width: 28px;
  height: 28px;
}

.automation-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.automation-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  flex: 1;
}