.newsletter-container {
    background: linear-gradient(135deg, #ffffff 0%, #fbfbfb 100%);
    padding: 0;
}

.newsletter-card {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 0;
    box-shadow: none;
    overflow: hidden;
    padding-bottom: 0;
    width: 100%;
    box-sizing: border-box;
  }

.newsletter-content {
    box-sizing: border-box;
    padding: 1rem;
    background: #fafbfc;
    width: 100%;
  }
  
.newsletter-content::-webkit-scrollbar {
    width: 8px;
}

.newsletter-content::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.newsletter-content::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

.newsletter-content::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

.newsletter-preview {
    background: white;
    padding: 1rem;
    border-radius: 0;
    box-shadow: none;
    border: none;
}

.newsletter-preview h1,
.newsletter-preview h2,
.newsletter-preview h3,
.newsletter-preview h4,
.newsletter-preview h5,
.newsletter-preview h6 {
    color: #2c3e50;
    margin: 1.5rem 0 1rem 0;
    font-weight: 600;
}

.newsletter-preview h1 {
    font-size: 1.75rem;
    border-bottom: 2px solid #667eea;
    padding-bottom: 0.4rem;
}

.newsletter-preview h2 {
    font-size: 1.5rem;
    border-bottom: 1.5px solid #764ba2;
    padding-bottom: 0.25rem;
}

.newsletter-preview h3 {
    font-size: 1.25rem;
    color: #667eea;
}

.newsletter-preview p {
    font-size: 1rem;
    margin-bottom: 0.8rem;
    color: #555;
}

.newsletter-preview blockquote {
    border-left: 4px solid #667eea;
    padding-left: 1rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: #666;
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 0 4px 4px 0;
}

.newsletter-preview code {
    background: #f4f4f4;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    color: #e74c3c;
}

.newsletter-preview pre {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    margin: 1rem 0;
}

.newsletter-preview pre code {
    background: none;
    color: inherit;
    padding: 0;
}

.newsletter-preview a {
    color: #667eea;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-bottom 0.3s ease;
}

.newsletter-preview a:hover {
    border-bottom: 1px solid #667eea;
}

.newsletter-preview li {
    margin-left: 0.25rem;
    list-style-type: none;
    padding-bottom: 0.5rem;
}

.newsletter-preview ul {
    padding: 5px;
    list-style-type: none;
    padding-bottom: 0.5rem;
}

.newsletter-preview img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1rem 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.newsletter-preview table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.newsletter-preview th,
.newsletter-preview td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #e1e5e9;
}

.newsletter-preview th {
    background: #667eea;
    color: white;
    font-weight: 600;
}

.newsletter-preview tr:nth-child(even) {
    background: #f8f9fa;
}

.newsletter-preview tr:hover {
    background: #e3f2fd;
}

@media (max-width: 768px) {
    .newsletter-container {
      padding: 0.625rem; /* 10px */
    }
  
    .newsletter-content {
      padding: 1.25rem; /* 20px */
    }
  
    .newsletter-preview {
      padding: 1.25rem;
    }
  }
  
  @media (max-width: 480px) {
    .newsletter-container {
      padding: 0;
    }
  
    .newsletter-card {
      border-radius: 0;
      box-shadow: none;
      margin: 0;
      padding-bottom: 1rem;
    }
  
    .newsletter-content {
      padding: 0.75rem; /* 12px */
    }
  
    .newsletter-preview {
      padding: 0.75rem;
    }
  }