*{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}.app{max-width:900px;margin:0 auto;padding:2rem}.todo-list-container{background:#fff;border-radius:12px;padding:2rem;box-shadow:0 10px 40px #0000001a}.todo-list-container h1{color:#333;margin-bottom:2rem;text-align:center;font-size:2.5rem}.todo-form{background:#f8f9fa;padding:1.5rem;border-radius:8px;margin-bottom:2rem}.todo-form h2{color:#555;margin-bottom:1rem;font-size:1.5rem}.form-group{margin-bottom:1rem}.form-input{width:100%;padding:.75rem;border:2px solid #e0e0e0;border-radius:6px;font-size:1rem;transition:border-color .3s}.form-input:focus{outline:none;border-color:#667eea}textarea.form-input{resize:vertical;font-family:inherit}.submit-btn{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:.75rem 2rem;border-radius:6px;font-size:1rem;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s}.submit-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea66}.submit-btn:active{transform:translateY(0)}.todos h2{color:#555;margin-bottom:1rem;font-size:1.5rem}.no-todos{text-align:center;color:#999;padding:2rem;font-style:italic}.todo-item{background:#fff;border:2px solid #e0e0e0;border-radius:8px;padding:1rem;margin-bottom:1rem;display:flex;justify-content:space-between;align-items:center;transition:border-color .3s,box-shadow .3s}.todo-item:hover{border-color:#667eea;box-shadow:0 2px 8px #667eea33}.todo-content{display:flex;align-items:flex-start;flex:1}.todo-checkbox{margin-right:1rem;width:20px;height:20px;cursor:pointer;margin-top:.2rem}.todo-details{flex:1}.todo-details h3{color:#333;margin-bottom:.5rem;font-size:1.2rem}.todo-details h3.completed{text-decoration:line-through;color:#999}.todo-details p{color:#666;margin-bottom:.5rem}.todo-details small{color:#999;font-size:.875rem}.delete-btn{background:#ff4757;color:#fff;border:none;padding:.5rem 1rem;border-radius:6px;font-size:.875rem;font-weight:600;cursor:pointer;transition:background .3s,transform .2s}.delete-btn:hover{background:#ee5a6f;transform:translateY(-2px)}.delete-btn:active{transform:translateY(0)}.error{background:#ffebee;color:#c62828;padding:1rem;border-radius:6px;margin-bottom:1rem;border-left:4px solid #c62828}.loading{text-align:center;padding:2rem;color:#fff;font-size:1.5rem}