*{box-sizing:border-box;margin:0;padding:0}:root{--primary-color:#6366f1;--primary-hover:#4f46e5;--secondary-color:#8b5cf6;--background:#fff;--surface:#f8fafc;--text-primary:#1e293b;--text-secondary:#64748b;--border-color:#e2e8f0;--success-color:#10b981;--error-color:#ef4444;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a,0 4px 6px -4px #0000001a;--shadow-xl:0 20px 25px -5px #0000001a,0 8px 10px -6px #0000001a}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--background);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;line-height:1.6}.landing-page{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);justify-content:center;align-items:center;min-height:100vh;padding:2rem 1rem;display:flex}.container{width:100%;max-width:900px;margin:0 auto}.header{text-align:center;color:#fff;margin-bottom:3rem}.title{text-shadow:0 2px 4px #0000001a;margin-bottom:1rem;font-size:3rem;font-weight:700}.subtitle{opacity:.95;font-size:1.25rem;font-weight:300}.main-content{box-shadow:var(--shadow-xl);background:#fff;border-radius:24px;padding:3rem}.upload-area{border:3px dashed var(--border-color);text-align:center;background:var(--surface);cursor:pointer;border-radius:16px;padding:4rem 2rem;transition:all .3s}.upload-area.dragging{border-color:var(--primary-color);background:#6366f10d;transform:scale(1.02)}.upload-area.has-file{border-color:var(--success-color);background:#10b9810d;padding:2rem}.file-input{display:none}.upload-icon{color:var(--primary-color);justify-content:center;margin-bottom:1.5rem;display:flex}.upload-title{color:var(--text-primary);margin-bottom:1rem;font-size:1.5rem;font-weight:600}.upload-subtitle{color:var(--text-secondary);margin:1rem 0}.browse-button{background:var(--primary-color);color:#fff;cursor:pointer;border:none;border-radius:8px;margin:1rem 0;padding:.75rem 2rem;font-size:1rem;font-weight:600;transition:all .2s}.browse-button:hover{background:var(--primary-hover);box-shadow:var(--shadow-md);transform:translateY(-2px)}.upload-hint{color:var(--text-secondary);margin-top:1rem;font-size:.875rem}.file-preview{box-shadow:var(--shadow-sm);background:#fff;border-radius:12px;align-items:center;gap:1rem;margin-bottom:2rem;padding:1.5rem;display:flex}.file-icon{color:var(--error-color);flex-shrink:0}.file-info{text-align:left;flex:1}.file-name{color:var(--text-primary);word-break:break-all;margin-bottom:.25rem;font-weight:600}.file-size{color:var(--text-secondary);font-size:.875rem}.remove-file{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-size:2rem;transition:all .2s;display:flex}.remove-file:hover{background:var(--surface);color:var(--error-color)}.convert-button{background:linear-gradient(135deg,var(--primary-color)0%,var(--secondary-color)100%);color:#fff;cursor:pointer;width:100%;box-shadow:var(--shadow-lg);border:none;border-radius:12px;padding:1rem 2rem;font-size:1.125rem;font-weight:600;transition:all .3s}.convert-button:hover:not(:disabled){box-shadow:var(--shadow-xl);transform:translateY(-2px)}.convert-button:disabled{opacity:.7;cursor:not-allowed}.features{border-top:1px solid var(--border-color);grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:2rem;margin-top:3rem;padding-top:3rem;display:grid}.feature{text-align:center}.feature-icon{margin-bottom:1rem;font-size:2.5rem}.feature h3{color:var(--text-primary);margin-bottom:.5rem;font-size:1.125rem;font-weight:600}.feature p{color:var(--text-secondary);font-size:.875rem}.conversion-page{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);justify-content:center;align-items:center;min-height:100vh;padding:2rem 1rem;display:flex}.conversion-card{text-align:center;padding:2rem 0}.spinner-container{margin-bottom:2rem}.spinner{border:4px solid var(--border-color);border-top-color:var(--primary-color);border-radius:50%;width:64px;height:64px;margin:0 auto;animation:1s linear infinite bd-spin}@keyframes bd-spin{to{transform:rotate(360deg)}}.success-icon{color:var(--success-color);justify-content:center;margin-bottom:1.5rem;display:flex}.error-icon{color:var(--error-color);margin-bottom:1.5rem}.status-title{color:var(--text-primary);margin-bottom:.75rem;font-size:1.75rem;font-weight:600}.status-title.success{color:var(--success-color)}.status-title.error{color:var(--error-color)}.status-message{color:var(--text-secondary);margin-bottom:1.5rem;font-size:1rem}.file-name-display{background:var(--surface);border-radius:8px;flex-wrap:wrap;justify-content:center;align-items:center;gap:.5rem;margin:1.5rem 0;padding:1rem;display:flex}.file-label{color:var(--text-secondary);font-size:.875rem;font-weight:600}.download-actions{flex-direction:column;gap:1rem;margin-top:2rem;display:flex}.download-button{cursor:pointer;box-shadow:var(--shadow-md);border:none;border-radius:12px;padding:1rem 2rem;font-size:1rem;font-weight:600;transition:all .3s}.download-button.primary{background:linear-gradient(135deg,var(--primary-color)0%,var(--secondary-color)100%);color:#fff}.download-button.primary:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.download-button.secondary{color:var(--primary-color);border:2px solid var(--primary-color);background:#fff}.download-button.secondary:hover{background:var(--primary-color);color:#fff;transform:translateY(-2px)}.retry-button{background:var(--primary-color);color:#fff;cursor:pointer;border:none;border-radius:8px;margin-top:1rem;padding:.75rem 2rem;font-size:1rem;font-weight:600;transition:all .2s}.retry-button:hover{background:var(--primary-hover);box-shadow:var(--shadow-md);transform:translateY(-2px)}.info-section{border-top:1px solid var(--border-color);margin-top:3rem;padding-top:3rem}.info-section h3{color:var(--text-primary);text-align:center;margin-bottom:1.5rem;font-size:1.5rem;font-weight:600}.info-cards{grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;display:grid}.info-card{background:var(--surface);text-align:center;border-radius:12px;padding:1.5rem;transition:all .2s}.info-card:hover{box-shadow:var(--shadow-md);transform:translateY(-4px)}.info-icon{margin-bottom:1rem;font-size:2.5rem}.info-card h4{color:var(--text-primary);margin-bottom:.5rem;font-size:1.125rem;font-weight:600}.info-card p{color:var(--text-secondary);font-size:.875rem}@media (max-width:768px){.title{font-size:2rem}.subtitle{font-size:1rem}.main-content{padding:2rem 1.5rem}.upload-area{padding:3rem 1.5rem}.features{grid-template-columns:1fr;gap:1.5rem}.download-actions,.download-button{width:100%}.info-cards{grid-template-columns:1fr}}