:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #a5b4fc;
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #334155;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --border: #334155;
  --sidebar-width: 260px;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* Auth Pages */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
}

.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.auth-card h1 {
  text-align: center;
  margin-bottom: 8px;
  font-size: 28px;
  color: var(--text);
}

.auth-card .subtitle {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 32px;
  font-size: 14px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: white;
  width: 100%;
}

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

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

.btn-success:hover {
  background: #059669;
}

.btn-danger {
  background: var(--danger);
  color: white;
  padding: 8px 16px;
  font-size: 12px;
}

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

.btn-sm {
  padding: 8px 16px;
  font-size: 12px;
}

.alert {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 14px;
}

.alert-error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.alert-success {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
}

.auth-link {
  text-align: center;
  margin-top: 24px;
  font-size: 14px;
  color: var(--text-muted);
}

.auth-link a {
  color: var(--primary-light);
  text-decoration: none;
  font-weight: 500;
}

.auth-link a:hover {
  text-decoration: underline;
}

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

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  padding: 24px 0;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
  z-index: 100;
}

.sidebar.hidden {
  transform: translateX(-100%);
}

.sidebar-brand {
  padding: 0 24px 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}

.sidebar-brand h2 {
  font-size: 20px;
  color: var(--primary-light);
}

.sidebar-brand span {
  font-size: 12px;
  color: var(--text-muted);
}

.sidebar-nav {
  flex: 1;
  padding: 0 12px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  margin-bottom: 4px;
}

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

.nav-item.active {
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary-light);
}

.nav-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 16px 12px;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  color: white;
}

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

.user-details .name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-details .role {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: capitalize;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 32px;
  transition: margin-left 0.3s ease;
}

.main-content.expanded {
  margin-left: 0;
}

/* Toggle Button */
.sidebar-toggle {
  position: fixed;
  top: 16px;
  left: 16px;
  width: 40px;
  height: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 101;
  transition: all 0.3s ease;
}

.sidebar-toggle:hover {
  background: var(--bg-input);
  color: var(--primary-light);
}

.sidebar-toggle.shifted {
  left: 276px;
}

.page-header {
  margin-bottom: 32px;
  padding-left: 50px;
}

.page-header h1 {
  font-size: 24px;
  margin-bottom: 4px;
}

.page-header p {
  color: var(--text-muted);
  font-size: 14px;
}

/* Stats Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.stat-card .stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.stat-card .stat-icon.purple {
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary-light);
}

.stat-card .stat-icon.green {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
}

.stat-card .stat-icon.orange {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
}

.stat-card .stat-value {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 4px;
}

.stat-card .stat-label {
  font-size: 14px;
  color: var(--text-muted);
}

/* Table */
.table-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

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

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

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

thead th {
  text-align: left;
  padding: 14px 24px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

tbody td {
  padding: 14px 24px;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background: rgba(99, 102, 241, 0.05);
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.badge-admin {
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary-light);
}

.badge-user {
  background: rgba(16, 185, 129, 0.15);
  color: #6ee7b7;
}

/* Create User Form */
.create-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 24px;
}

.create-form h3 {
  margin-bottom: 20px;
  font-size: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

/* Collapsible Nav Toggle */
.nav-toggle {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 4px;
  user-select: none;
}

.nav-toggle:hover {
  background: var(--bg-input);
  color: var(--text);
}

.nav-toggle svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.nav-arrow {
  margin-left: auto;
  transition: transform 0.2s;
}

.nav-group {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  margin-left: 20px;
}

.nav-group.show {
  max-height: 500px;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: 260px;
  }
  .sidebar.visible {
    transform: translateX(0);
  }
  .main-content {
    margin-left: 0;
    padding: 16px;
    padding-top: 64px;
  }
  .main-content.expanded {
    margin-left: 0;
  }
  .sidebar-toggle {
    left: 16px;
    top: 12px;
    z-index: 102;
  }
  .sidebar-toggle.shifted {
    left: 16px;
  }
  .sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 99;
  }
  .sidebar-overlay.visible {
    display: block;
  }
  .page-header {
    padding-left: 0;
    margin-bottom: 20px;
  }
  .page-header h1 {
    font-size: 20px;
  }
  .stats-grid {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 20px;
  }
  .stat-card {
    padding: 16px;
  }
  .stat-card .stat-value {
    font-size: 20px;
  }
  .stat-card .stat-icon {
    width: 40px;
    height: 40px;
    margin-bottom: 12px;
  }
  .table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .table-header {
    padding: 16px;
    flex-wrap: wrap;
    gap: 8px;
  }
  table {
    min-width: 500px;
  }
  thead th {
    padding: 10px 12px;
    font-size: 11px;
  }
  tbody td {
    padding: 10px 12px;
    font-size: 13px;
  }
  .create-form {
    padding: 16px;
  }
  .form-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .form-group input,
  .form-group select {
    padding: 10px 12px;
    font-size: 14px;
  }
  .btn {
    padding: 10px 16px;
    font-size: 13px;
  }
  .auth-card {
    padding: 24px;
    margin: 10px;
  }
  .auth-card h1 {
    font-size: 22px;
  }
  .nav-toggle,
  .nav-item {
    padding: 10px 12px;
    font-size: 13px;
  }
  .nav-group {
    margin-left: 12px;
  }
  .user-info {
    padding: 10px 12px;
  }
  .sidebar-brand {
    padding: 0 16px 16px;
  }
  .log-container {
    max-height: 300px;
    font-size: 11px;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: 12px;
    padding-top: 60px;
  }
  .page-header h1 {
    font-size: 18px;
  }
  .stat-card {
    padding: 14px;
  }
  .stat-card .stat-value {
    font-size: 18px;
  }
  .table-header {
    padding: 12px;
  }
  .create-form {
    padding: 14px;
  }
}