/* 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);
   }
   
   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);
       }
   }
   /* 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(--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);
   }
   /* Blog Section */
   
   .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;
   }