:root {
  --primary-color: #6366f1;
  --secondary-color: #8b5cf6;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --dark-bg: #1f2937;
  --darker-bg: #111827;
  --light-text: #f3f4f6;
  --muted-text: #9ca3af;
  --border-color: #374151;
  --card-bg: #1e293b;
}

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

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

.admin-container {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar */
.admin-sidebar {
  width: 280px;
  background-color: var(--dark-bg);
  border-right: 1px solid var(--border-color);
  padding: 20px;
  overflow-y: auto;
  position: fixed;
  height: 100vh;
  left: 0;
  top: 0;
}

.admin-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.admin-logo i {
  font-size: 28px;
  color: var(--primary-color);
}

.admin-logo h2 {
  font-size: 22px;
  color: var(--light-text);
}

.admin-nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: var(--muted-text);
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  background: none;
  font-size: 15px;
  font-family: inherit;
}

.nav-link:hover {
  background-color: rgba(99, 102, 241, 0.1);
  color: var(--primary-color);
}

.nav-link.active {
  background-color: rgba(99, 102, 241, 0.2);
  color: var(--primary-color);
  border-left: 3px solid var(--primary-color);
  padding-left: 13px;
}

.nav-link.logout {
  margin-top: 20px;
  color: var(--danger-color);
}

.nav-link.logout:hover {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--danger-color);
}

.nav-link i {
  width: 20px;
  text-align: center;
}

/* Main Content */
.admin-content {
  flex: 1;
  margin-left: 280px;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.admin-header {
  background-color: var(--dark-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 20px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.admin-header h1 {
  font-size: 28px;
  color: var(--light-text);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted-text);
}

.user-info i {
  font-size: 24px;
  color: var(--primary-color);
}

/* Content Sections */
.admin-content > main {
  flex: 1;
  overflow-y: auto;
  padding: 30px;
}

.content-section {
  display: none;
  animation: fadeIn 0.3s ease-in;
}

.content-section.active {
  display: block;
}

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

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}

.section-header h2 {
  font-size: 24px;
  color: var(--light-text);
}

.filter-group,
.search-group {
  display: flex;
  gap: 10px;
}

.filter-group input,
.search-group input {
  padding: 10px 15px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--card-bg);
  color: var(--light-text);
}

.filter-group input:focus,
.search-group input:focus {
  outline: none;
  border-color: var(--primary-color);
}

.search-group input {
  min-width: 250px;
}

/* Dashboard Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.stat-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 20px;
  display: flex;
  gap: 20px;
  align-items: center;
}

.stat-icon {
  width: 60px;
  height: 60px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

.users-icon {
  background-color: rgba(139, 92, 246, 0.1);
  color: #8b5cf6;
}

.courses-icon {
  background-color: rgba(59, 130, 246, 0.1);
  color: #3b82f6;
}

.purchases-icon {
  background-color: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.revenue-icon {
  background-color: rgba(245, 158, 11, 0.1);
  color: #f59e0b;
}

.stat-content h3 {
  font-size: 14px;
  color: var(--muted-text);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: 28px;
  font-weight: bold;
  color: var(--light-text);
}

/* Management Cards */
.management-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.management-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 20px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.management-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 15px;
}

.card-header i {
  font-size: 20px;
  color: var(--primary-color);
  background-color: rgba(99, 102, 241, 0.1);
  padding: 8px;
  border-radius: 8px;
}

.card-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--light-text);
  margin: 0;
}

.card-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.card-actions .btn-sm {
  padding: 8px 12px;
  font-size: 13px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-family: inherit;
}

.card-actions .btn-sm i {
  font-size: 12px;
}

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

.card-actions .btn-primary:hover {
  background-color: #5558e3;
}

.card-actions .btn-secondary {
  background-color: rgba(107, 114, 128, 0.1);
  color: var(--light-text);
  border: 1px solid var(--border-color);
}

.card-actions .btn-secondary:hover {
  background-color: rgba(107, 114, 128, 0.2);
  border-color: var(--primary-color);
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--card-bg);
  border-radius: 10px;
  overflow: hidden;
}

.data-table thead {
  background-color: rgba(99, 102, 241, 0.1);
}

.data-table th {
  padding: 15px;
  text-align: left;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-color);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.data-table td {
  padding: 15px;
  border-top: 1px solid var(--border-color);
  color: var(--light-text);
  font-size: 14px;
}

.data-table tbody tr:hover {
  background-color: rgba(99, 102, 241, 0.05);
}

.courses-table-wrapper,
.purchases-table-wrapper,
.users-table-wrapper {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  overflow-x: auto;
}

.text-center {
  text-align: center;
}

/* Packages Section */
.packages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.package-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 25px;
}

.package-card h3 {
  font-size: 20px;
  color: var(--light-text);
  margin-bottom: 20px;
  text-align: center;
}

.package-field {
  margin-bottom: 20px;
}

.package-field label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted-text);
  font-size: 13px;
  font-weight: 600;
}

.package-price-input {
  width: 100%;
  padding: 10px 15px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: rgba(0, 0, 0, 0.2);
  color: var(--light-text);
  font-size: 16px;
}

.package-price-input:focus {
  outline: none;
  border-color: var(--primary-color);
  background-color: rgba(99, 102, 241, 0.05);
}

/* Settings */
.settings-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 25px;
  max-width: 600px;
}

.settings-card h3 {
  font-size: 18px;
  color: var(--light-text);
  margin-bottom: 20px;
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted-text);
  font-size: 14px;
  font-weight: 600;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 15px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: rgba(0, 0, 0, 0.2);
  color: var(--light-text);
  font-size: 14px;
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  background-color: rgba(99, 102, 241, 0.05);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-group.checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 20px;
}

.form-group.checkbox input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
}

.form-group.checkbox label {
  margin: 0;
  cursor: pointer;
  font-weight: normal;
}

.form-actions {
  display: flex;
  gap: 10px;
  margin-top: 25px;
}

/* Buttons */
.btn-primary,
.btn-secondary {
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: inherit;
}

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

.btn-primary:hover {
  background-color: #4f46e5;
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--muted-text);
  color: white;
}

.btn-secondary:hover {
  background-color: #6b7280;
}

.btn-danger {
  background-color: var(--danger-color);
  color: white;
  padding: 6px 12px;
  font-size: 13px;
}

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

.btn-edit {
  background-color: var(--secondary-color);
  color: white;
  padding: 6px 12px;
  font-size: 13px;
}

.btn-edit:hover {
  background-color: #7c3aed;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
}

.modal.show {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: modalFadeIn 0.3s ease;
}

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

.modal-content {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 30px;
  max-width: 600px;
  width: 90%;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 15px;
  right: 20px;
  font-size: 28px;
  font-weight: bold;
  color: var(--muted-text);
  cursor: pointer;
  transition: color 0.3s ease;
}

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

.modal-content h2 {
  font-size: 22px;
  color: var(--light-text);
  margin-bottom: 20px;
}

/* Toast Messages */
.toast-message {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 15px 25px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  display: none;
  z-index: 2000;
  animation: slideIn 0.3s ease;
}

.toast-message.show {
  display: block;
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

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

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

/* Action Buttons in Table */
.action-buttons {
  display: flex;
  gap: 5px;
}

.action-buttons button {
  padding: 6px 10px;
  border: none;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.toggle-visibility {
  background-color: rgba(99, 102, 241, 0.2);
  color: var(--primary-color);
}

.toggle-visibility:hover {
  background-color: rgba(99, 102, 241, 0.3);
}

.status-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  background-color: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  background-color: rgba(59, 130, 246, 0.1);
  color: #3b82f6;
}

/* Free Courses Grid */
.free-courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.free-course-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.free-course-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(99, 102, 241, 0.2);
}

.free-course-card h4 {
  color: var(--light-text);
  margin-bottom: 10px;
  font-size: 18px;
}

.free-course-card p {
  color: var(--muted-text);
  margin-bottom: 15px;
  font-size: 14px;
  line-height: 1.5;
}

.free-course-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
  border-radius: 6px;
  text-decoration: none;
  display: inline-block;
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .admin-sidebar {
    width: 200px;
  }

  .admin-content {
    margin-left: 200px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .admin-sidebar {
    width: 100%;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .admin-content {
    margin-left: 0;
  }

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

  .nav-link {
    padding: 8px 12px;
  }

  .admin-header {
    flex-direction: column;
    gap: 15px;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
  }

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

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

  .filter-group {
    flex-wrap: wrap;
  }

  .modal-content {
    width: 95%;
  }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background-color: var(--dark-bg);
}

::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--muted-text);
}