*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh}#root{min-height:100vh}.app{min-height:100vh;display:flex;flex-direction:column}.app-header{background:#fffffff2;padding:1.5rem 2rem;box-shadow:0 2px 10px #0000001a;display:flex;justify-content:space-between;align-items:center}.app-header h1{color:#667eea;font-size:1.8rem}.user-info{display:flex;align-items:center;gap:1rem}.user-info span{color:#333;font-weight:500}.app-main{flex:1;padding:2rem;max-width:1200px;width:100%;margin:0 auto}.loading-container{display:flex;flex-direction:column;justify-content:center;align-items:center;min-height:100vh;color:#fff}.spinner{border:4px solid rgba(255,255,255,.3);border-top:4px solid white;border-radius:50%;width:50px;height:50px;animation:spin 1s linear infinite;margin-bottom:1rem}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.auth-container{display:flex;justify-content:center;align-items:center;min-height:70vh}.auth-card{background:#fff;padding:2.5rem;border-radius:12px;box-shadow:0 10px 40px #0003;width:100%;max-width:400px}.auth-card h2{color:#667eea;margin-bottom:1.5rem;text-align:center}.auth-form{display:flex;flex-direction:column;gap:1rem}.form-group{display:flex;flex-direction:column;gap:.5rem}.form-group label{color:#333;font-weight:500}.form-group input{padding:.75rem;border:2px solid #e0e0e0;border-radius:6px;font-size:1rem;transition:border-color .3s}.form-group input:focus{outline:none;border-color:#667eea}.auth-toggle{text-align:center;margin-top:1rem;color:#666}.link-button{background:none;border:none;color:#667eea;cursor:pointer;font-weight:600;text-decoration:underline}.link-button:hover{color:#764ba2}.btn{padding:.75rem 1.5rem;border:none;border-radius:6px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 5px 15px #667eea66}.btn-secondary{background:#f5f5f5;color:#333}.btn-secondary:hover{background:#e0e0e0}.btn-small{padding:.5rem 1rem;font-size:.875rem}.btn-danger{background:#ff4757;color:#fff}.btn-danger:hover{background:#ff3838}.dashboard{display:flex;flex-direction:column;gap:2rem}.upload-container{background:#fff;padding:2rem;border-radius:12px;box-shadow:0 5px 20px #0000001a}.upload-container h2{color:#667eea;margin-bottom:1.5rem}.upload-card{display:flex;flex-direction:column;gap:1rem}.file-input-wrapper{position:relative}.file-input{position:absolute;opacity:0;pointer-events:none}.file-label{display:flex;align-items:center;justify-content:center;padding:2rem;border:2px dashed #667eea;border-radius:8px;cursor:pointer;transition:all .3s;background:#f8f9ff;color:#667eea;font-weight:600}.file-label:hover{background:#f0f2ff;border-color:#764ba2}.file-info{padding:1rem;background:#f5f5f5;border-radius:6px}.file-info p{margin:.25rem 0;color:#666}.progress-bar{width:100%;height:30px;background:#e0e0e0;border-radius:15px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,#667eea,#764ba2);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;transition:width .3s}.error-message{padding:1rem;background:#ffebee;color:#c62828;border-radius:6px;border-left:4px solid #c62828}.success-message{padding:1rem;background:#e8f5e9;color:#2e7d32;border-radius:6px;border-left:4px solid #2e7d32}.file-list-container{background:#fff;padding:2rem;border-radius:12px;box-shadow:0 5px 20px #0000001a}.file-list-container h2{color:#667eea;margin-bottom:1.5rem}.loading{text-align:center;padding:2rem;color:#666}.empty-state{text-align:center;padding:3rem;color:#999}.file-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}.file-card{background:#f8f9ff;border:2px solid #e0e0e0;border-radius:10px;padding:1.5rem;display:flex;flex-direction:column;gap:1rem;transition:all .3s}.file-card:hover{transform:translateY(-4px);box-shadow:0 8px 20px #667eea33;border-color:#667eea}.file-icon{font-size:3rem;text-align:center}.file-details{flex:1}.file-name{color:#333;font-size:1rem;margin-bottom:.5rem;word-break:break-word}.file-size,.file-date{color:#666;font-size:.875rem;margin:.25rem 0}.file-actions{display:flex;gap:.5rem;flex-wrap:wrap}.file-actions .btn{flex:1;min-width:70px}.btn-share{background:#4caf50;color:#fff}.btn-share:hover{background:#45a049}.modal-overlay{position:fixed;inset:0;background:#000000b3;display:flex;justify-content:center;align-items:center;z-index:1000;padding:1rem}.modal-content{background:#fff;border-radius:12px;width:100%;max-width:500px;max-height:90vh;overflow-y:auto;box-shadow:0 10px 40px #0000004d}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:1.5rem;border-bottom:1px solid #e0e0e0}.modal-header h3{color:#667eea;margin:0;font-size:1.5rem}.close-button{background:none;border:none;font-size:2rem;color:#999;cursor:pointer;padding:0;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:4px;transition:all .3s}.close-button:hover{background:#f5f5f5;color:#333}.modal-body{padding:1.5rem}.modal-actions{display:flex;gap:1rem;margin-top:1.5rem}.modal-actions .btn{flex:1}.file-info-box{background:#f8f9ff;padding:1rem;border-radius:8px;margin-bottom:1.5rem;border-left:4px solid #667eea}.file-info-box p{margin:.5rem 0;color:#333}.input-field{width:100%;padding:.75rem;border:2px solid #e0e0e0;border-radius:6px;font-size:1rem;transition:border-color .3s}.input-field:focus{outline:none;border-color:#667eea}.input-hint{color:#666;font-size:.875rem;margin-top:.25rem;display:block}.shared-files-container{background:#fff;padding:2rem;border-radius:12px;box-shadow:0 5px 20px #0000001a;margin-top:2rem}.shared-files-container h2{color:#667eea;margin-bottom:1.5rem}.tabs{display:flex;gap:.5rem;margin-bottom:1.5rem;border-bottom:2px solid #e0e0e0}.tab{background:none;border:none;padding:1rem 1.5rem;font-size:1rem;font-weight:600;color:#666;cursor:pointer;border-bottom:3px solid transparent;transition:all .3s;position:relative;bottom:-2px}.tab:hover{color:#667eea}.tab.active{color:#667eea;border-bottom-color:#667eea}.shared-file-card{border-left:4px solid #4CAF50}.share-info{color:#4caf50;font-size:.875rem;font-weight:600;margin-top:.5rem}@media(max-width:768px){.app-header{flex-direction:column;gap:1rem;text-align:center}.app-main{padding:1rem}.file-grid{grid-template-columns:1fr}.auth-card,.modal-content{margin:1rem}.tabs{flex-direction:column;border-bottom:none}.tab{border-bottom:2px solid #e0e0e0;border-left:3px solid transparent}.tab.active{border-left-color:#667eea;border-bottom-color:#e0e0e0}.file-actions{flex-direction:column}.file-actions .btn{width:100%}}