.admin-layout {
  display: flex;
  min-height: 100vh;
}

.admin-sidebar {
  width: 260px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  transition: all 0.3s ease;
}
.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
}
.sidebar-header a {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
}
.sidebar-header a i { color: var(--accent-primary); }
.sidebar-nav {
  flex: 1;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
}
.sidebar-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
  font-size: 15px;
}
.sidebar-link:hover { background: rgba(255,255,255,0.04); color: var(--text-primary); }
.sidebar-link.active {
  background: rgba(0,255,136,0.08);
  color: var(--accent-primary);
  font-weight: 600;
}
.sidebar-link i { width: 20px; text-align: center; font-size: 16px; }
.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-color);
}

.admin-main {
  flex: 1;
  margin-left: 260px;
  min-height: 100vh;
  background: var(--bg-primary);
}
.admin-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 30px;
  border-radius: 0;
  position: sticky;
  top: 0;
  z-index: 99;
  border-bottom: 1px solid var(--border-color);
}
.sidebar-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 18px;
}
.admin-user { display: flex; align-items: center; gap: 12px; }
.admin-content { padding: 30px; }
.admin-page { display: none; }
.admin-page.active { display: block; }

.analytics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}
.analytics-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px;
  transition: all 0.3s;
}
.analytics-card:hover { border-color: var(--accent-primary); }
.analytics-card i {
  font-size: 36px;
  color: var(--accent-primary);
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,255,136,0.08);
  border-radius: var(--radius);
}
.analytics-number { display: block; font-size: 28px; font-weight: 800; }
.analytics-label { color: var(--text-secondary); font-size: 14px; }

.chart-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 30px;
  max-height: 350px;
}

.recent-uploads {
  padding: 24px;
}
.recent-uploads h3 { margin-bottom: 16px; }

.form-card {
  padding: 30px;
  max-width: 800px;
}
.form-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 24px; }
.form-message {
  margin-top: 16px;
  padding: 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  display: none;
}
.form-message.success { display: block; background: rgba(0,255,136,0.1); color: var(--success); }
.form-message.error { display: block; background: rgba(255,68,68,0.1); color: var(--danger); }

/* Course management table */
.course-manage-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
}
.course-manage-item:last-child { border-bottom: none; }
.course-manage-item img { width: 60px; height: 60px; border-radius: var(--radius-sm); object-fit: cover; }
.course-manage-item .course-info { flex: 1; min-width: 150px; }
.course-manage-item .course-info h4 { font-size: 16px; }
.course-manage-item .course-info p { font-size: 13px; color: var(--text-secondary); }
.course-manage-actions { display: flex; gap: 8px; }

/* Blog management */
.blog-manage-item {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
}
.blog-manage-item:last-child { border-bottom: none; }

/* Users table */
.user-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px;
  border-bottom: 1px solid var(--border-color);
}
.user-item:last-child { border-bottom: none; }
.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(0,255,136,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
}
.user-info { flex: 1; }
.user-info h4 { font-size: 15px; }
.user-info p { font-size: 13px; color: var(--text-secondary); }

/* Mobile sidebar */
@media (max-width: 768px) {
  .admin-sidebar {
    transform: translateX(-100%);
  }
  .admin-sidebar.open {
    transform: translateX(0);
  }
  .sidebar-toggle { display: flex; }
  .admin-main { margin-left: 0; }
  .admin-content { padding: 16px; }
  .analytics-grid { grid-template-columns: 1fr; }
  .form-card { padding: 20px; }
}