/* Critical CSS extracted from main.css */
  
   :root {
      --primary-color: #4361ee;
      --primary-dark: #3a56d4;
      --secondary-color: #3f37c9;
      --accent-color: #4895ef;
      --dark-color: #16213e;
      --light-color: #f8f9fa;
      --text-color: #e6f1ff;
      --text-secondary: #ccd6f6;
      --text-tertiary: #a8b2d1;
      --gray-color: #6c757d;
      --success-color: #4bb543;
      --error-color: #ff3333;
      --warning-color: #ffcc00;
      --footer-bg: #0a192f;
      --footer-text: #e6f1ff;
      --footer-link: #64ffda;
      --card-bg: rgba(16, 42, 87, 0.7);
      --card-border: rgba(67, 97, 238, 0.2);
      --tool-card-bg: rgba(16, 42, 87, 0.5);
  }
  
  body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
      line-height: 1.6;
      color: var(--text-color);
      background-color: #0a192f;
      background-image: linear-gradient(135deg, #0a192f 0%, #172a45 100%);
      margin: 0;
      padding: 0;
      overflow-x: hidden;
  }
  
  .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
  }
  
  .header {
      text-align: center;
      padding: 40px 0 30px;
  }
  
  .header h1 {
      font-size: clamp(1.8rem, 4vw, 2.5rem);
      margin-bottom: 10px;
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
  }
  
  .header .subtitle {
      font-size: clamp(1rem, 2vw, 1.1rem);
      color: var(--text-secondary);
      max-width: 700px;
      margin: 0 auto;
  }
  
  .converter-card {
      background-color: var(--card-bg);
      border-radius: 10px;
      padding: 30px;
      margin-bottom: 40px;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
      border: 1px solid var(--card-border);
      backdrop-filter: blur(5px);
  }
  
  .upload-section {
      border: 2px dashed rgba(67, 97, 238, 0.3);
      border-radius: 10px;
      padding: 40px 20px;
      text-align: center;
      margin-bottom: 30px;
      position: relative;
      min-height: 200px;
  }
  /* Loading spinner - critical for UX */
  
  .loading-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: rgba(10, 25, 47, 0.9);
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 9999;
      display: none;
  }
  
  .spinner {
      width: 50px;
      height: 50px;
      border: 5px solid rgba(255, 255, 255, 0.3);
      border-radius: 50%;
      border-top-color: var(--primary-color);
      animation: spin 1s ease-in-out infinite;
  }
  
  @keyframes spin {
      to {
          transform: rotate(360deg);
      }
  }
  /* Results section styling */
  
  .results-section {
      display: none;
      margin-top: 20px;
      animation: fadeIn 0.3s ease;
  }
  
  @keyframes fadeIn {
      from {
          opacity: 0;
      }
      to {
          opacity: 1;
      }
  }
  
  .conversion-preview {
      text-align: center;
      padding: 20px;
  }
  
  .preview-icon {
      font-size: 60px;
      color: var(--accent-color);
      margin-bottom: 15px;
  }
  
  .preview-text {
      color: var(--text-secondary);
      margin-bottom: 20px;
  }
  
  .results-actions {
      display: flex;
      gap: 10px;
      justify-content: center;
      margin-bottom: 20px;
  }
  
  .small-btn {
      padding: 8px 16px;
      font-size: 0.9rem;
  }
  /* Progress bar */
  
  .progress-container {
      display: none;
      margin-top: 20px;
  }
  
  .progress-bar {
      height: 8px;
      background-color: rgba(67, 97, 238, 0.2);
      border-radius: 4px;
      overflow: hidden;
      margin-top: 5px;
  }
  
  .progress-bar-fill {
      height: 100%;
      background-color: var(--primary-color);
      width: 0%;
      transition: width 0.3s ease;
  }
  /* File info display */
  
  .file-info {
      display: none;
      align-items: center;
      background: rgba(67, 97, 238, 0.1);
      border-radius: 8px;
      padding: 10px 15px;
      margin-top: 15px;
      justify-content: space-between;
  }
  
  .remove-btn {
      background: none;
      border: none;
      color: var(--error-color);
      font-size: 1.2rem;
      cursor: pointer;
      padding: 0 5px;
  }
  /* Related Tools Section */
  
  .related-tools-section {
      margin: 40px 0;
      padding: 30px;
      background-color: var(--card-bg);
      border-radius: 10px;
      border: 1px solid var(--card-border);
  }
  
  .related-tools-section h2 {
      color: var(--primary-color);
      margin-bottom: 25px;
      text-align: center;
      position: relative;
      padding-bottom: 15px;
  }
  
  .related-tools-section h2::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 80px;
      height: 3px;
      background-color: var(--accent-color);
  }
  
  .tools-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 20px;
  }
  
  .tool-card {
      background-color: var(--tool-card-bg);
      border-radius: 12px;
      padding: 25px;
      transition: all 0.3s ease;
      border: 1px solid var(--card-border);
      display: flex;
      flex-direction: column;
      align-items: flex-start;
  }
  
  .tool-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
      border-color: var(--accent-color);
  }
  
  .tool-icon-container {
      width: 50px;
      height: 50px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 15px;
      font-size: 1.5rem;
      color: white;
  }
  
  .tool-card h3 {
      color: var(--primary-color);
      margin-bottom: 12px;
      font-size: 1.2rem;
      font-weight: 600;
  }
  
  .tool-card p {
      color: var(--text-color);
      font-size: 0.95rem;
      margin-bottom: 20px;
      line-height: 1.5;
  }
  
  .tool-card a {
      display: inline-flex;
      align-items: center;
      background-color: var(--accent-color);
      color: white;
      padding: 10px 18px;
      border-radius: 8px;
      text-decoration: none;
      font-weight: 500;
      transition: all 0.3s;
      margin-top: auto;
  }
  
  .tool-card a:hover {
      background-color: var(--footer-link);
      transform: translateY(-2px);
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
      color: var(--accent-color);
  }
  
  .tool-card a i {
      margin-left: 8px;
      font-size: 0.9rem;
      transition: transform 0.3s;
  }
  
  .tool-card a:hover i {
      transform: translateX(3px);
  }
  /* SEO Content Styling */
  
  .seo-content {
      margin: 40px 0;
      padding: 30px;
      background-color: var(--card-bg);
      border-radius: 10px;
      border: 1px solid var(--card-border);
  }
  
  .seo-content h2 {
      color: var(--primary-color);
      margin-top: 2rem;
      font-size: 1.5rem;
  }
  
  .seo-content h3 {
      color: var(--accent-color);
      margin-top: 1.5rem;
      font-size: 1.3rem;
  }
  
  .seo-content p {
      margin-bottom: 1rem;
      line-height: 1.6;
  }
  
  .seo-content ul,
  .seo-content ol {
      margin-left: 1.5rem;
      line-height: 1.6;
      margin-bottom: 1.5rem;
  }
  
  .seo-content li {
      margin-bottom: 0.5rem;
  }
  /* FAQ Styling */
  
  .faq-item {
      margin-bottom: 15px;
      border-bottom: 1px solid var(--card-border);
      padding-bottom: 15px;
  }
  
  .faq-question {
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      padding: 10px 0;
      color: var(--text-color);
      font-size: 1.1rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
  }
  
  .faq-question i {
      transition: transform 0.3s;
  }
  
  .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding-left: 10px;
  }
  
  .faq-answer.show {
      max-height: 500px;
  }
  /* Blog section styling */
  
  .blog-section {
      margin-top: 40px;
      padding: 30px;
      background-color: var(--card-bg);
      border-radius: 10px;
      border: 1px solid var(--card-border);
  }
  
  .blog-section h2 {
      color: var(--primary-color);
      margin-bottom: 20px;
  }
  
  .blog-article {
      margin-bottom: 20px;
      padding-bottom: 20px;
      border-bottom: 1px solid var(--card-border);
  }
  
  .blog-article:last-child {
      border-bottom: none;
      margin-bottom: 0;
      padding-bottom: 0;
  }
  
  .blog-article h3 {
      margin-bottom: 10px;
      font-size: 1.2rem;
  }
  
  .blog-article a {
      color: var(--footer-link);
      text-decoration: none;
      transition: color 0.3s;
  }
  
  .blog-article a:hover {
      color: var(--accent-color);
      text-decoration: underline;
  }
  
  .blog-article p {
      color: var(--text-tertiary);
      font-size: 0.95rem;
      line-height: 1.5;
  }
  /* Go to Top Button */
  
  .go-to-top {
      position: fixed;
      bottom: 30px;
      right: 30px;
      background-color: var(--accent-color);
      color: white;
      width: 50px;
      height: 50px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
      transition: all 0.3s;
      z-index: 99;
      opacity: 0;
      visibility: hidden;
  }
  
  .go-to-top.visible {
      opacity: 1;
      visibility: visible;
  }
  
  .go-to-top:hover {
      background-color: var(--primary-dark);
      transform: translateY(-3px);
  }
  
  .go-to-top i {
      font-size: 1.2rem;
  }