*{box-sizing:border-box;padding:0;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;padding:20px;color:#333}.container{max-width:800px;margin:0 auto;background:white;border-radius:16px;box-shadow:0 20px 60px rgba(0,0,0,.3);padding:40px;min-height:500px}.header{text-align:center;margin-bottom:30px;padding-bottom:20px;border-bottom:2px solid #f0f0f0}.header h1{font-size:2.5rem;color:#667eea;margin-bottom:10px;font-weight:700}.header p{color:#666;font-size:1.1rem}.language-selector{display:flex;justify-content:center;gap:10px;margin-bottom:30px;flex-wrap:wrap}.language-btn{padding:8px 20px;border:2px solid #667eea;background:white;color:#667eea;border-radius:20px;cursor:pointer;font-size:.9rem;transition:all .3s ease;font-weight:500}.language-btn:hover{transform:translateY(-2px)}.language-btn.active,.language-btn:hover{background:#667eea;color:white}.add-todo-form{margin-bottom:30px;padding:20px;background:#f8f9fa;border-radius:12px}.form-group{margin-bottom:15px}.form-group label{display:block;margin-bottom:5px;font-weight:600;color:#555}.form-group input,.form-group textarea{width:100%;padding:12px;border:2px solid #e0e0e0;border-radius:8px;font-size:1rem;transition:border-color .3s ease;font-family:inherit}.form-group input:focus,.form-group textarea:focus{outline:none;border-color:#667eea}.form-group textarea{resize:vertical;min-height:80px}.btn{padding:12px 30px;border:none;border-radius:8px;font-size:1rem;cursor:pointer;transition:all .3s ease;font-weight:600}.btn-primary{background:#667eea;color:white}.btn-primary:hover{background:#5568d3;transform:translateY(-2px);box-shadow:0 5px 15px rgba(102,126,234,.4)}.btn-secondary{background:#6c757d;color:white;margin-left:10px}.btn-secondary:hover{background:#5a6268}.btn-danger{background:#dc3545;color:white;padding:8px 16px;font-size:.9rem}.btn-danger:hover{background:#c82333}.btn-edit{background:#28a745;color:white;padding:8px 16px;font-size:.9rem;margin-right:10px}.btn-edit:hover{background:#218838}.filter-tabs{display:flex;justify-content:center;gap:15px;margin-bottom:25px;border-bottom:2px solid #f0f0f0;padding-bottom:15px}.filter-tab{padding:8px 20px;background:transparent;color:#666;cursor:pointer;font-size:1rem;font-weight:500;transition:all .3s ease;border:none;border-bottom:3px solid transparent}.filter-tab:hover{color:#667eea}.filter-tab.active{color:#667eea;border-bottom-color:#667eea}.todos-list{list-style:none}.todo-item{padding:20px;margin-bottom:15px;background:#f8f9fa;border-radius:12px;border-left:4px solid #667eea;transition:all .3s ease}.todo-item:hover{transform:translateX(5px);box-shadow:0 5px 15px rgba(0,0,0,.1)}.todo-item.completed{opacity:.7;border-left-color:#28a745}.todo-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}.todo-title-section{display:flex;align-items:center;gap:12px;flex:1 1}.todo-checkbox{width:24px;height:24px;cursor:pointer}.todo-title{font-size:1.2rem;font-weight:600;color:#333}.todo-item.completed .todo-title{text-decoration:line-through;color:#999}.todo-actions{display:flex;gap:10px}.todo-description{margin-left:36px;color:#666;line-height:1.6}.todo-meta{margin-left:36px;margin-top:10px;font-size:.85rem;color:#999}.empty-state{text-align:center;padding:60px 20px;color:#999}.empty-state-icon{font-size:4rem;margin-bottom:20px}.empty-state-text,.loading{font-size:1.2rem}.loading{text-align:center;padding:40px;color:#667eea}.error{padding:15px;background:#f8d7da;border:1px solid #f5c6cb;border-radius:8px;color:#721c24;margin-bottom:20px}@media (max-width:768px){.container{padding:20px}.header h1{font-size:2rem}.todo-header{flex-direction:column;align-items:flex-start}.todo-actions{margin-top:10px;width:100%}.filter-tabs{gap:10px}.filter-tabs,.language-selector{flex-direction:column}.language-btn{width:100%}}