Advanced Fair Launch Guide

// Fair Launch Contract Structure
contract FairLaunch {
    uint256 public totalTokensForSale;
    uint256 public totalRaised;
    uint256 public maxContribution;
    uint256 public minContribution;
    
    mapping(address => uint256) public contributions;
    
    function contribute() external payable {
        require(block.timestamp >= startTime, "Not started");
        require(block.timestamp <= endTime, "Ended");
        require(msg.value >= minContribution, "Below minimum");
        require(contributions[msg.sender] + msg.value <= maxContribution, "Exceeds maximum");
        
        contributions[msg.sender] += msg.value;
        totalRaised += msg.value;
    }
    
    function claimTokens() external {
        require(block.timestamp > endTime, "Not finalized");
        uint256 userContribution = contributions[msg.sender];
        uint256 tokenAmount = (userContribution * totalTokensForSale) / totalRaised;
        // Transfer tokens to user
    }
}