{"sources":{"Dagongmiao.sol":{"content":"// SPDX-License-Identifier: MIT\npragma solidity 0.8.24;\n\n// File: @openzeppelin/contracts/utils/introspection/IERC165.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/IERC165.sol)\n\n\n/**\n * @dev Interface of the ERC165 standard, as defined in the\n * https://eips.ethereum.org/EIPS/eip-165[EIP].\n *\n * Implementers can declare support of contract interfaces, which can then be\n * queried by others ({ERC165Checker}).\n *\n * For an implementation, see {ERC165}.\n */\ninterface IERC165 {\n    /**\n     * @dev Returns true if this contract implements the interface defined by\n     * `interfaceId`. See the corresponding\n     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]\n     * to learn more about how these ids are created.\n     *\n     * This function call must use less than 30 000 gas.\n     */\n    function supportsInterface(bytes4 interfaceId) external view returns (bool);\n}\n\n// File: @openzeppelin/contracts/token/ERC721/IERC721.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/IERC721.sol)\n\n\n\n/**\n * @dev Required interface of an ERC721 compliant contract.\n */\ninterface IERC721 is IERC165 {\n    /**\n     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);\n\n    /**\n     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.\n     */\n    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);\n\n    /**\n     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.\n     */\n    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);\n\n    /**\n     * @dev Returns the number of tokens in ``owner``'s account.\n     */\n    function balanceOf(address owner) external view returns (uint256 balance);\n\n    /**\n     * @dev Returns the owner of the `tokenId` token.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function ownerOf(uint256 tokenId) external view returns (address owner);\n\n    /**\n     * @dev Safely transfers `tokenId` token from `from` to `to`.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must exist and be owned by `from`.\n     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon\n     *   a safe transfer.\n     *\n     * Emits a {Transfer} event.\n     */\n    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;\n\n    /**\n     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\n     * are aware of the ERC721 protocol to prevent tokens from being forever locked.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must exist and be owned by `from`.\n     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or\n     *   {setApprovalForAll}.\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon\n     *   a safe transfer.\n     *\n     * Emits a {Transfer} event.\n     */\n    function safeTransferFrom(address from, address to, uint256 tokenId) external;\n\n    /**\n     * @dev Transfers `tokenId` token from `from` to `to`.\n     *\n     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721\n     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must\n     * understand this adds an external call which potentially creates a reentrancy vulnerability.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must be owned by `from`.\n     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(address from, address to, uint256 tokenId) external;\n\n    /**\n     * @dev Gives permission to `to` to transfer `tokenId` token to another account.\n     * The approval is cleared when the token is transferred.\n     *\n     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.\n     *\n     * Requirements:\n     *\n     * - The caller must own the token or be an approved operator.\n     * - `tokenId` must exist.\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address to, uint256 tokenId) external;\n\n    /**\n     * @dev Approve or remove `operator` as an operator for the caller.\n     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.\n     *\n     * Requirements:\n     *\n     * - The `operator` cannot be the address zero.\n     *\n     * Emits an {ApprovalForAll} event.\n     */\n    function setApprovalForAll(address operator, bool approved) external;\n\n    /**\n     * @dev Returns the account approved for `tokenId` token.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function getApproved(uint256 tokenId) external view returns (address operator);\n\n    /**\n     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.\n     *\n     * See {setApprovalForAll}\n     */\n    function isApprovedForAll(address owner, address operator) external view returns (bool);\n}\n\n// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/IERC721Receiver.sol)\n\n\n/**\n * @title ERC721 token receiver interface\n * @dev Interface for any contract that wants to support safeTransfers\n * from ERC721 asset contracts.\n */\ninterface IERC721Receiver {\n    /**\n     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}\n     * by `operator` from `from`, this function is called.\n     *\n     * It must return its Solidity selector to confirm the token transfer.\n     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be\n     * reverted.\n     *\n     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.\n     */\n    function onERC721Received(\n        address operator,\n        address from,\n        uint256 tokenId,\n        bytes calldata data\n    ) external returns (bytes4);\n}\n\n// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/extensions/IERC721Metadata.sol)\n\n\n\n/**\n * @title ERC-721 Non-Fungible Token Standard, optional metadata extension\n * @dev See https://eips.ethereum.org/EIPS/eip-721\n */\ninterface IERC721Metadata is IERC721 {\n    /**\n     * @dev Returns the token collection name.\n     */\n    function name() external view returns (string memory);\n\n    /**\n     * @dev Returns the token collection symbol.\n     */\n    function symbol() external view returns (string memory);\n\n    /**\n     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.\n     */\n    function tokenURI(uint256 tokenId) external view returns (string memory);\n}\n\n// File: @openzeppelin/contracts/utils/Context.sol\n// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)\n\n\n/**\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n    function _msgSender() internal view virtual returns (address) {\n        return msg.sender;\n    }\n\n    function _msgData() internal view virtual returns (bytes calldata) {\n        return msg.data;\n    }\n\n    function _contextSuffixLength() internal view virtual returns (uint256) {\n        return 0;\n    }\n}\n\n// File: @openzeppelin/contracts/utils/math/Math.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/Math.sol)\n\n\n/**\n * @dev Standard math utilities missing in the Solidity language.\n */\nlibrary Math {\n    /**\n     * @dev Muldiv operation overflow.\n     */\n    error MathOverflowedMulDiv();\n\n    enum Rounding {\n        Floor, // Toward negative infinity\n        Ceil, // Toward positive infinity\n        Trunc, // Toward zero\n        Expand // Away from zero\n    }\n\n    /**\n     * @dev Returns the addition of two unsigned integers, with an overflow flag.\n     */\n    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        unchecked {\n            uint256 c = a + b;\n            if (c < a) return (false, 0);\n            return (true, c);\n        }\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.\n     */\n    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        unchecked {\n            if (b > a) return (false, 0);\n            return (true, a - b);\n        }\n    }\n\n    /**\n     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.\n     */\n    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        unchecked {\n            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\n            // benefit is lost if 'b' is also tested.\n            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\n            if (a == 0) return (true, 0);\n            uint256 c = a * b;\n            if (c / a != b) return (false, 0);\n            return (true, c);\n        }\n    }\n\n    /**\n     * @dev Returns the division of two unsigned integers, with a division by zero flag.\n     */\n    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        unchecked {\n            if (b == 0) return (false, 0);\n            return (true, a / b);\n        }\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.\n     */\n    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        unchecked {\n            if (b == 0) return (false, 0);\n            return (true, a % b);\n        }\n    }\n\n    /**\n     * @dev Returns the largest of two numbers.\n     */\n    function max(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a > b ? a : b;\n    }\n\n    /**\n     * @dev Returns the smallest of two numbers.\n     */\n    function min(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a < b ? a : b;\n    }\n\n    /**\n     * @dev Returns the average of two numbers. The result is rounded towards\n     * zero.\n     */\n    function average(uint256 a, uint256 b) internal pure returns (uint256) {\n        // (a + b) / 2 can overflow.\n        return (a & b) + (a ^ b) / 2;\n    }\n\n    /**\n     * @dev Returns the ceiling of the division of two numbers.\n     *\n     * This differs from standard division with `/` in that it rounds towards infinity instead\n     * of rounding towards zero.\n     */\n    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {\n        if (b == 0) {\n            // Guarantee the same behavior as in a regular Solidity division.\n            return a / b;\n        }\n\n        // (a + b - 1) / b can overflow on addition, so we distribute.\n        return a == 0 ? 0 : (a - 1) / b + 1;\n    }\n\n    /**\n     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or\n     * denominator == 0.\n     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) with further edits by\n     * Uniswap Labs also under MIT license.\n     */\n    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {\n        unchecked {\n            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use\n            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256\n            // variables such that product = prod1 * 2^256 + prod0.\n            uint256 prod0 = x * y; // Least significant 256 bits of the product\n            uint256 prod1; // Most significant 256 bits of the product\n            assembly {\n                let mm := mulmod(x, y, not(0))\n                prod1 := sub(sub(mm, prod0), lt(mm, prod0))\n            }\n\n            // Handle non-overflow cases, 256 by 256 division.\n            if (prod1 == 0) {\n                // Solidity will revert if denominator == 0, unlike the div opcode on its own.\n                // The surrounding unchecked block does not change this fact.\n                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.\n                return prod0 / denominator;\n            }\n\n            // Make sure the result is less than 2^256. Also prevents denominator == 0.\n            if (denominator <= prod1) {\n                revert MathOverflowedMulDiv();\n            }\n\n            ///////////////////////////////////////////////\n            // 512 by 256 division.\n            ///////////////////////////////////////////////\n\n            // Make division exact by subtracting the remainder from [prod1 prod0].\n            uint256 remainder;\n            assembly {\n                // Compute remainder using mulmod.\n                remainder := mulmod(x, y, denominator)\n\n                // Subtract 256 bit number from 512 bit number.\n                prod1 := sub(prod1, gt(remainder, prod0))\n                prod0 := sub(prod0, remainder)\n            }\n\n            // Factor powers of two out of denominator and compute largest power of two divisor of denominator.\n            // Always >= 1. See https://cs.stackexchange.com/q/138556/92363.\n\n            uint256 twos = denominator & (0 - denominator);\n            assembly {\n                // Divide denominator by twos.\n                denominator := div(denominator, twos)\n\n                // Divide [prod1 prod0] by twos.\n                prod0 := div(prod0, twos)\n\n                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.\n                twos := add(div(sub(0, twos), twos), 1)\n            }\n\n            // Shift in bits from prod1 into prod0.\n            prod0 |= prod1 * twos;\n\n            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such\n            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for\n            // four bits. That is, denominator * inv = 1 mod 2^4.\n            uint256 inverse = (3 * denominator) ^ 2;\n\n            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also\n            // works in modular arithmetic, doubling the correct bits in each step.\n            inverse *= 2 - denominator * inverse; // inverse mod 2^8\n            inverse *= 2 - denominator * inverse; // inverse mod 2^16\n            inverse *= 2 - denominator * inverse; // inverse mod 2^32\n            inverse *= 2 - denominator * inverse; // inverse mod 2^64\n            inverse *= 2 - denominator * inverse; // inverse mod 2^128\n            inverse *= 2 - denominator * inverse; // inverse mod 2^256\n\n            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.\n            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is\n            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1\n            // is no longer required.\n            result = prod0 * inverse;\n            return result;\n        }\n    }\n\n    /**\n     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.\n     */\n    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {\n        uint256 result = mulDiv(x, y, denominator);\n        if (unsignedRoundsUp(rounding) && mulmod(x, y, denominator) > 0) {\n            result += 1;\n        }\n        return result;\n    }\n\n    /**\n     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded\n     * towards zero.\n     *\n     * Inspired by Henry S. Warren, Jr.'s \"Hacker's Delight\" (Chapter 11).\n     */\n    function sqrt(uint256 a) internal pure returns (uint256) {\n        if (a == 0) {\n            return 0;\n        }\n\n        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.\n        //\n        // We know that the \"msb\" (most significant bit) of our target number `a` is a power of 2 such that we have\n        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.\n        //\n        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`\n        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`\n        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`\n        //\n        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.\n        uint256 result = 1 << (log2(a) >> 1);\n\n        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,\n        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at\n        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision\n        // into the expected uint128 result.\n        unchecked {\n            result = (result + a / result) >> 1;\n            result = (result + a / result) >> 1;\n            result = (result + a / result) >> 1;\n            result = (result + a / result) >> 1;\n            result = (result + a / result) >> 1;\n            result = (result + a / result) >> 1;\n            result = (result + a / result) >> 1;\n            return min(result, a / result);\n        }\n    }\n\n    /**\n     * @notice Calculates sqrt(a), following the selected rounding direction.\n     */\n    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {\n        unchecked {\n            uint256 result = sqrt(a);\n            return result + (unsignedRoundsUp(rounding) && result * result < a ? 1 : 0);\n        }\n    }\n\n    /**\n     * @dev Return the log in base 2 of a positive value rounded towards zero.\n     * Returns 0 if given 0.\n     */\n    function log2(uint256 value) internal pure returns (uint256) {\n        uint256 result = 0;\n        unchecked {\n            if (value >> 128 > 0) {\n                value >>= 128;\n                result += 128;\n            }\n            if (value >> 64 > 0) {\n                value >>= 64;\n                result += 64;\n            }\n            if (value >> 32 > 0) {\n                value >>= 32;\n                result += 32;\n            }\n            if (value >> 16 > 0) {\n                value >>= 16;\n                result += 16;\n            }\n            if (value >> 8 > 0) {\n                value >>= 8;\n                result += 8;\n            }\n            if (value >> 4 > 0) {\n                value >>= 4;\n                result += 4;\n            }\n            if (value >> 2 > 0) {\n                value >>= 2;\n                result += 2;\n            }\n            if (value >> 1 > 0) {\n                result += 1;\n            }\n        }\n        return result;\n    }\n\n    /**\n     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.\n     * Returns 0 if given 0.\n     */\n    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {\n        unchecked {\n            uint256 result = log2(value);\n            return result + (unsignedRoundsUp(rounding) && 1 << result < value ? 1 : 0);\n        }\n    }\n\n    /**\n     * @dev Return the log in base 10 of a positive value rounded towards zero.\n     * Returns 0 if given 0.\n     */\n    function log10(uint256 value) internal pure returns (uint256) {\n        uint256 result = 0;\n        unchecked {\n            if (value >= 10 ** 64) {\n                value /= 10 ** 64;\n                result += 64;\n            }\n            if (value >= 10 ** 32) {\n                value /= 10 ** 32;\n                result += 32;\n            }\n            if (value >= 10 ** 16) {\n                value /= 10 ** 16;\n                result += 16;\n            }\n            if (value >= 10 ** 8) {\n                value /= 10 ** 8;\n                result += 8;\n            }\n            if (value >= 10 ** 4) {\n                value /= 10 ** 4;\n                result += 4;\n            }\n            if (value >= 10 ** 2) {\n                value /= 10 ** 2;\n                result += 2;\n            }\n            if (value >= 10 ** 1) {\n                result += 1;\n            }\n        }\n        return result;\n    }\n\n    /**\n     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.\n     * Returns 0 if given 0.\n     */\n    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {\n        unchecked {\n            uint256 result = log10(value);\n            return result + (unsignedRoundsUp(rounding) && 10 ** result < value ? 1 : 0);\n        }\n    }\n\n    /**\n     * @dev Return the log in base 256 of a positive value rounded towards zero.\n     * Returns 0 if given 0.\n     *\n     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.\n     */\n    function log256(uint256 value) internal pure returns (uint256) {\n        uint256 result = 0;\n        unchecked {\n            if (value >> 128 > 0) {\n                value >>= 128;\n                result += 16;\n            }\n            if (value >> 64 > 0) {\n                value >>= 64;\n                result += 8;\n            }\n            if (value >> 32 > 0) {\n                value >>= 32;\n                result += 4;\n            }\n            if (value >> 16 > 0) {\n                value >>= 16;\n                result += 2;\n            }\n            if (value >> 8 > 0) {\n                result += 1;\n            }\n        }\n        return result;\n    }\n\n    /**\n     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.\n     * Returns 0 if given 0.\n     */\n    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {\n        unchecked {\n            uint256 result = log256(value);\n            return result + (unsignedRoundsUp(rounding) && 1 << (result << 3) < value ? 1 : 0);\n        }\n    }\n\n    /**\n     * @dev Returns whether a provided rounding mode is considered rounding up for unsigned integers.\n     */\n    function unsignedRoundsUp(Rounding rounding) internal pure returns (bool) {\n        return uint8(rounding) % 2 == 1;\n    }\n}\n\n// File: @openzeppelin/contracts/utils/math/SignedMath.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/SignedMath.sol)\n\n\n/**\n * @dev Standard signed math utilities missing in the Solidity language.\n */\nlibrary SignedMath {\n    /**\n     * @dev Returns the largest of two signed numbers.\n     */\n    function max(int256 a, int256 b) internal pure returns (int256) {\n        return a > b ? a : b;\n    }\n\n    /**\n     * @dev Returns the smallest of two signed numbers.\n     */\n    function min(int256 a, int256 b) internal pure returns (int256) {\n        return a < b ? a : b;\n    }\n\n    /**\n     * @dev Returns the average of two signed numbers without overflow.\n     * The result is rounded towards zero.\n     */\n    function average(int256 a, int256 b) internal pure returns (int256) {\n        // Formula from the book \"Hacker's Delight\"\n        int256 x = (a & b) + ((a ^ b) >> 1);\n        return x + (int256(uint256(x) >> 255) & (a ^ b));\n    }\n\n    /**\n     * @dev Returns the absolute unsigned value of a signed value.\n     */\n    function abs(int256 n) internal pure returns (uint256) {\n        unchecked {\n            // must be unchecked in order to support `n = type(int256).min`\n            return uint256(n >= 0 ? n : -n);\n        }\n    }\n}\n\n// File: @openzeppelin/contracts/utils/Strings.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (utils/Strings.sol)\n\n\n\n/**\n * @dev String operations.\n */\nlibrary Strings {\n    bytes16 private constant HEX_DIGITS = \"0123456789abcdef\";\n    uint8 private constant ADDRESS_LENGTH = 20;\n\n    /**\n     * @dev The `value` string doesn't fit in the specified `length`.\n     */\n    error StringsInsufficientHexLength(uint256 value, uint256 length);\n\n    /**\n     * @dev Converts a `uint256` to its ASCII `string` decimal representation.\n     */\n    function toString(uint256 value) internal pure returns (string memory) {\n        unchecked {\n            uint256 length = Math.log10(value) + 1;\n            string memory buffer = new string(length);\n            uint256 ptr;\n            /// @solidity memory-safe-assembly\n            assembly {\n                ptr := add(buffer, add(32, length))\n            }\n            while (true) {\n                ptr--;\n                /// @solidity memory-safe-assembly\n                assembly {\n                    mstore8(ptr, byte(mod(value, 10), HEX_DIGITS))\n                }\n                value /= 10;\n                if (value == 0) break;\n            }\n            return buffer;\n        }\n    }\n\n    /**\n     * @dev Converts a `int256` to its ASCII `string` decimal representation.\n     */\n    function toStringSigned(int256 value) internal pure returns (string memory) {\n        return string.concat(value < 0 ? \"-\" : \"\", toString(SignedMath.abs(value)));\n    }\n\n    /**\n     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.\n     */\n    function toHexString(uint256 value) internal pure returns (string memory) {\n        unchecked {\n            return toHexString(value, Math.log256(value) + 1);\n        }\n    }\n\n    /**\n     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.\n     */\n    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {\n        uint256 localValue = value;\n        bytes memory buffer = new bytes(2 * length + 2);\n        buffer[0] = \"0\";\n        buffer[1] = \"x\";\n        for (uint256 i = 2 * length + 1; i > 1; --i) {\n            buffer[i] = HEX_DIGITS[localValue & 0xf];\n            localValue >>= 4;\n        }\n        if (localValue != 0) {\n            revert StringsInsufficientHexLength(value, length);\n        }\n        return string(buffer);\n    }\n\n    /**\n     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal\n     * representation.\n     */\n    function toHexString(address addr) internal pure returns (string memory) {\n        return toHexString(uint256(uint160(addr)), ADDRESS_LENGTH);\n    }\n\n    /**\n     * @dev Returns true if the two strings are equal.\n     */\n    function equal(string memory a, string memory b) internal pure returns (bool) {\n        return bytes(a).length == bytes(b).length && keccak256(bytes(a)) == keccak256(bytes(b));\n    }\n}\n\n// File: @openzeppelin/contracts/utils/introspection/ERC165.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/ERC165.sol)\n\n\n\n/**\n * @dev Implementation of the {IERC165} interface.\n *\n * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check\n * for the additional interface id that will be supported. For example:\n *\n * ```solidity\n * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);\n * }\n * ```\n */\nabstract contract ERC165 is IERC165 {\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {\n        return interfaceId == type(IERC165).interfaceId;\n    }\n}\n\n// File: @openzeppelin/contracts/interfaces/draft-IERC6093.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/draft-IERC6093.sol)\n\n/**\n * @dev Standard ERC20 Errors\n * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.\n */\ninterface IERC20Errors {\n    /**\n     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.\n     * @param sender Address whose tokens are being transferred.\n     * @param balance Current balance for the interacting account.\n     * @param needed Minimum amount required to perform a transfer.\n     */\n    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);\n\n    /**\n     * @dev Indicates a failure with the token `sender`. Used in transfers.\n     * @param sender Address whose tokens are being transferred.\n     */\n    error ERC20InvalidSender(address sender);\n\n    /**\n     * @dev Indicates a failure with the token `receiver`. Used in transfers.\n     * @param receiver Address to which tokens are being transferred.\n     */\n    error ERC20InvalidReceiver(address receiver);\n\n    /**\n     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.\n     * @param spender Address that may be allowed to operate on tokens without being their owner.\n     * @param allowance Amount of tokens a `spender` is allowed to operate with.\n     * @param needed Minimum amount required to perform a transfer.\n     */\n    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);\n\n    /**\n     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.\n     * @param approver Address initiating an approval operation.\n     */\n    error ERC20InvalidApprover(address approver);\n\n    /**\n     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.\n     * @param spender Address that may be allowed to operate on tokens without being their owner.\n     */\n    error ERC20InvalidSpender(address spender);\n}\n\n/**\n * @dev Standard ERC721 Errors\n * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.\n */\ninterface IERC721Errors {\n    /**\n     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20.\n     * Used in balance queries.\n     * @param owner Address of the current owner of a token.\n     */\n    error ERC721InvalidOwner(address owner);\n\n    /**\n     * @dev Indicates a `tokenId` whose `owner` is the zero address.\n     * @param tokenId Identifier number of a token.\n     */\n    error ERC721NonexistentToken(uint256 tokenId);\n\n    /**\n     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.\n     * @param sender Address whose tokens are being transferred.\n     * @param tokenId Identifier number of a token.\n     * @param owner Address of the current owner of a token.\n     */\n    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);\n\n    /**\n     * @dev Indicates a failure with the token `sender`. Used in transfers.\n     * @param sender Address whose tokens are being transferred.\n     */\n    error ERC721InvalidSender(address sender);\n\n    /**\n     * @dev Indicates a failure with the token `receiver`. Used in transfers.\n     * @param receiver Address to which tokens are being transferred.\n     */\n    error ERC721InvalidReceiver(address receiver);\n\n    /**\n     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.\n     * @param operator Address that may be allowed to operate on tokens without being their owner.\n     * @param tokenId Identifier number of a token.\n     */\n    error ERC721InsufficientApproval(address operator, uint256 tokenId);\n\n    /**\n     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.\n     * @param approver Address initiating an approval operation.\n     */\n    error ERC721InvalidApprover(address approver);\n\n    /**\n     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.\n     * @param operator Address that may be allowed to operate on tokens without being their owner.\n     */\n    error ERC721InvalidOperator(address operator);\n}\n\n/**\n * @dev Standard ERC1155 Errors\n * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.\n */\ninterface IERC1155Errors {\n    /**\n     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.\n     * @param sender Address whose tokens are being transferred.\n     * @param balance Current balance for the interacting account.\n     * @param needed Minimum amount required to perform a transfer.\n     * @param tokenId Identifier number of a token.\n     */\n    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);\n\n    /**\n     * @dev Indicates a failure with the token `sender`. Used in transfers.\n     * @param sender Address whose tokens are being transferred.\n     */\n    error ERC1155InvalidSender(address sender);\n\n    /**\n     * @dev Indicates a failure with the token `receiver`. Used in transfers.\n     * @param receiver Address to which tokens are being transferred.\n     */\n    error ERC1155InvalidReceiver(address receiver);\n\n    /**\n     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.\n     * @param operator Address that may be allowed to operate on tokens without being their owner.\n     * @param owner Address of the current owner of a token.\n     */\n    error ERC1155MissingApprovalForAll(address operator, address owner);\n\n    /**\n     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.\n     * @param approver Address initiating an approval operation.\n     */\n    error ERC1155InvalidApprover(address approver);\n\n    /**\n     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.\n     * @param operator Address that may be allowed to operate on tokens without being their owner.\n     */\n    error ERC1155InvalidOperator(address operator);\n\n    /**\n     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.\n     * Used in batch transfers.\n     * @param idsLength Length of the array of token identifiers\n     * @param valuesLength Length of the array of token amounts\n     */\n    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);\n}\n\n// File: @openzeppelin/contracts/token/ERC721/ERC721.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/ERC721.sol)\n\n\n\n/**\n * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including\n * the Metadata extension, but not including the Enumerable extension, which is available separately as\n * {ERC721Enumerable}.\n */\nabstract contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Errors {\n    using Strings for uint256;\n\n    // Token name\n    string private _name;\n\n    // Token symbol\n    string private _symbol;\n\n    mapping(uint256 tokenId => address) private _owners;\n\n    mapping(address owner => uint256) private _balances;\n\n    mapping(uint256 tokenId => address) private _tokenApprovals;\n\n    mapping(address owner => mapping(address operator => bool)) private _operatorApprovals;\n\n    /**\n     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.\n     */\n    constructor(string memory name_, string memory symbol_) {\n        _name = name_;\n        _symbol = symbol_;\n    }\n\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {\n        return\n            interfaceId == type(IERC721).interfaceId ||\n            interfaceId == type(IERC721Metadata).interfaceId ||\n            super.supportsInterface(interfaceId);\n    }\n\n    /**\n     * @dev See {IERC721-balanceOf}.\n     */\n    function balanceOf(address owner) public view virtual returns (uint256) {\n        if (owner == address(0)) {\n            revert ERC721InvalidOwner(address(0));\n        }\n        return _balances[owner];\n    }\n\n    /**\n     * @dev See {IERC721-ownerOf}.\n     */\n    function ownerOf(uint256 tokenId) public view virtual returns (address) {\n        return _requireOwned(tokenId);\n    }\n\n    /**\n     * @dev See {IERC721Metadata-name}.\n     */\n    function name() public view virtual returns (string memory) {\n        return _name;\n    }\n\n    /**\n     * @dev See {IERC721Metadata-symbol}.\n     */\n    function symbol() public view virtual returns (string memory) {\n        return _symbol;\n    }\n\n    /**\n     * @dev See {IERC721Metadata-tokenURI}.\n     */\n    function tokenURI(uint256 tokenId) public view virtual returns (string memory) {\n        _requireOwned(tokenId);\n\n        string memory baseURI = _baseURI();\n        return bytes(baseURI).length > 0 ? string.concat(baseURI, tokenId.toString()) : \"\";\n    }\n\n    /**\n     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each\n     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty\n     * by default, can be overridden in child contracts.\n     */\n    function _baseURI() internal view virtual returns (string memory) {\n        return \"\";\n    }\n\n    /**\n     * @dev See {IERC721-approve}.\n     */\n    function approve(address to, uint256 tokenId) public virtual {\n        _approve(to, tokenId, _msgSender());\n    }\n\n    /**\n     * @dev See {IERC721-getApproved}.\n     */\n    function getApproved(uint256 tokenId) public view virtual returns (address) {\n        _requireOwned(tokenId);\n\n        return _getApproved(tokenId);\n    }\n\n    /**\n     * @dev See {IERC721-setApprovalForAll}.\n     */\n    function setApprovalForAll(address operator, bool approved) public virtual {\n        _setApprovalForAll(_msgSender(), operator, approved);\n    }\n\n    /**\n     * @dev See {IERC721-isApprovedForAll}.\n     */\n    function isApprovedForAll(address owner, address operator) public view virtual returns (bool) {\n        return _operatorApprovals[owner][operator];\n    }\n\n    /**\n     * @dev See {IERC721-transferFrom}.\n     */\n    function transferFrom(address from, address to, uint256 tokenId) public virtual {\n        if (to == address(0)) {\n            revert ERC721InvalidReceiver(address(0));\n        }\n        // Setting an \"auth\" arguments enables the `_isAuthorized` check which verifies that the token exists\n        // (from != 0). Therefore, it is not needed to verify that the return value is not 0 here.\n        address previousOwner = _update(to, tokenId, _msgSender());\n        if (previousOwner != from) {\n            revert ERC721IncorrectOwner(from, tokenId, previousOwner);\n        }\n    }\n\n    /**\n     * @dev See {IERC721-safeTransferFrom}.\n     */\n    function safeTransferFrom(address from, address to, uint256 tokenId) public {\n        safeTransferFrom(from, to, tokenId, \"\");\n    }\n\n    /**\n     * @dev See {IERC721-safeTransferFrom}.\n     */\n    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual {\n        transferFrom(from, to, tokenId);\n        _checkOnERC721Received(from, to, tokenId, data);\n    }\n\n    /**\n     * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist\n     *\n     * IMPORTANT: Any overrides to this function that add ownership of tokens not tracked by the\n     * core ERC721 logic MUST be matched with the use of {_increaseBalance} to keep balances\n     * consistent with ownership. The invariant to preserve is that for any address `a` the value returned by\n     * `balanceOf(a)` must be equal to the number of tokens such that `_ownerOf(tokenId)` is `a`.\n     */\n    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {\n        return _owners[tokenId];\n    }\n\n    /**\n     * @dev Returns the approved address for `tokenId`. Returns 0 if `tokenId` is not minted.\n     */\n    function _getApproved(uint256 tokenId) internal view virtual returns (address) {\n        return _tokenApprovals[tokenId];\n    }\n\n    /**\n     * @dev Returns whether `spender` is allowed to manage `owner`'s tokens, or `tokenId` in\n     * particular (ignoring whether it is owned by `owner`).\n     *\n     * WARNING: This function assumes that `owner` is the actual owner of `tokenId` and does not verify this\n     * assumption.\n     */\n    function _isAuthorized(address owner, address spender, uint256 tokenId) internal view virtual returns (bool) {\n        return\n            spender != address(0) &&\n            (owner == spender || isApprovedForAll(owner, spender) || _getApproved(tokenId) == spender);\n    }\n\n    /**\n     * @dev Checks if `spender` can operate on `tokenId`, assuming the provided `owner` is the actual owner.\n     * Reverts if `spender` does not have approval from the provided `owner` for the given token or for all its assets\n     * the `spender` for the specific `tokenId`.\n     *\n     * WARNING: This function assumes that `owner` is the actual owner of `tokenId` and does not verify this\n     * assumption.\n     */\n    function _checkAuthorized(address owner, address spender, uint256 tokenId) internal view virtual {\n        if (!_isAuthorized(owner, spender, tokenId)) {\n            if (owner == address(0)) {\n                revert ERC721NonexistentToken(tokenId);\n            } else {\n                revert ERC721InsufficientApproval(spender, tokenId);\n            }\n        }\n    }\n\n    /**\n     * @dev Unsafe write access to the balances, used by extensions that \"mint\" tokens using an {ownerOf} override.\n     *\n     * NOTE: the value is limited to type(uint128).max. This protect against _balance overflow. It is unrealistic that\n     * a uint256 would ever overflow from increments when these increments are bounded to uint128 values.\n     *\n     * WARNING: Increasing an account's balance using this function tends to be paired with an override of the\n     * {_ownerOf} function to resolve the ownership of the corresponding tokens so that balances and ownership\n     * remain consistent with one another.\n     */\n    function _increaseBalance(address account, uint128 value) internal virtual {\n        unchecked {\n            _balances[account] += value;\n        }\n    }\n\n    /**\n     * @dev Transfers `tokenId` from its current owner to `to`, or alternatively mints (or burns) if the current owner\n     * (or `to`) is the zero address. Returns the owner of the `tokenId` before the update.\n     *\n     * The `auth` argument is optional. If the value passed is non 0, then this function will check that\n     * `auth` is either the owner of the token, or approved to operate on the token (by the owner).\n     *\n     * Emits a {Transfer} event.\n     *\n     * NOTE: If overriding this function in a way that tracks balances, see also {_increaseBalance}.\n     */\n    function _update(address to, uint256 tokenId, address auth) internal virtual returns (address) {\n        address from = _ownerOf(tokenId);\n\n        // Perform (optional) operator check\n        if (auth != address(0)) {\n            _checkAuthorized(from, auth, tokenId);\n        }\n\n        // Execute the update\n        if (from != address(0)) {\n            // Clear approval. No need to re-authorize or emit the Approval event\n            _approve(address(0), tokenId, address(0), false);\n\n            unchecked {\n                _balances[from] -= 1;\n            }\n        }\n\n        if (to != address(0)) {\n            unchecked {\n                _balances[to] += 1;\n            }\n        }\n\n        _owners[tokenId] = to;\n\n        emit Transfer(from, to, tokenId);\n\n        return from;\n    }\n\n    /**\n     * @dev Mints `tokenId` and transfers it to `to`.\n     *\n     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible\n     *\n     * Requirements:\n     *\n     * - `tokenId` must not exist.\n     * - `to` cannot be the zero address.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _mint(address to, uint256 tokenId) internal {\n        if (to == address(0)) {\n            revert ERC721InvalidReceiver(address(0));\n        }\n        address previousOwner = _update(to, tokenId, address(0));\n        if (previousOwner != address(0)) {\n            revert ERC721InvalidSender(address(0));\n        }\n    }\n\n    /**\n     * @dev Mints `tokenId`, transfers it to `to` and checks for `to` acceptance.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must not exist.\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _safeMint(address to, uint256 tokenId) internal {\n        _safeMint(to, tokenId, \"\");\n    }\n\n    /**\n     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is\n     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\n     */\n    function _safeMint(address to, uint256 tokenId, bytes memory data) internal virtual {\n        _mint(to, tokenId);\n        _checkOnERC721Received(address(0), to, tokenId, data);\n    }\n\n    /**\n     * @dev Destroys `tokenId`.\n     * The approval is cleared when the token is burned.\n     * This is an internal function that does not check if the sender is authorized to operate on the token.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _burn(uint256 tokenId) internal {\n        address previousOwner = _update(address(0), tokenId, address(0));\n        if (previousOwner == address(0)) {\n            revert ERC721NonexistentToken(tokenId);\n        }\n    }\n\n    /**\n     * @dev Transfers `tokenId` from `from` to `to`.\n     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.\n     *\n     * Requirements:\n     *\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must be owned by `from`.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _transfer(address from, address to, uint256 tokenId) internal {\n        if (to == address(0)) {\n            revert ERC721InvalidReceiver(address(0));\n        }\n        address previousOwner = _update(to, tokenId, address(0));\n        if (previousOwner == address(0)) {\n            revert ERC721NonexistentToken(tokenId);\n        } else if (previousOwner != from) {\n            revert ERC721IncorrectOwner(from, tokenId, previousOwner);\n        }\n    }\n\n    /**\n     * @dev Safely transfers `tokenId` token from `from` to `to`, checking that contract recipients\n     * are aware of the ERC721 standard to prevent tokens from being forever locked.\n     *\n     * `data` is additional data, it has no specified format and it is sent in call to `to`.\n     *\n     * This internal function is like {safeTransferFrom} in the sense that it invokes\n     * {IERC721Receiver-onERC721Received} on the receiver, and can be used to e.g.\n     * implement alternative mechanisms to perform token transfer, such as signature-based.\n     *\n     * Requirements:\n     *\n     * - `tokenId` token must exist and be owned by `from`.\n     * - `to` cannot be the zero address.\n     * - `from` cannot be the zero address.\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _safeTransfer(address from, address to, uint256 tokenId) internal {\n        _safeTransfer(from, to, tokenId, \"\");\n    }\n\n    /**\n     * @dev Same as {xref-ERC721-_safeTransfer-address-address-uint256-}[`_safeTransfer`], with an additional `data` parameter which is\n     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\n     */\n    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory data) internal virtual {\n        _transfer(from, to, tokenId);\n        _checkOnERC721Received(from, to, tokenId, data);\n    }\n\n    /**\n     * @dev Approve `to` to operate on `tokenId`\n     *\n     * The `auth` argument is optional. If the value passed is non 0, then this function will check that `auth` is\n     * either the owner of the token, or approved to operate on all tokens held by this owner.\n     *\n     * Emits an {Approval} event.\n     *\n     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.\n     */\n    function _approve(address to, uint256 tokenId, address auth) internal {\n        _approve(to, tokenId, auth, true);\n    }\n\n    /**\n     * @dev Variant of `_approve` with an optional flag to enable or disable the {Approval} event. The event is not\n     * emitted in the context of transfers.\n     */\n    function _approve(address to, uint256 tokenId, address auth, bool emitEvent) internal virtual {\n        // Avoid reading the owner unless necessary\n        if (emitEvent || auth != address(0)) {\n            address owner = _requireOwned(tokenId);\n\n            // We do not use _isAuthorized because single-token approvals should not be able to call approve\n            if (auth != address(0) && owner != auth && !isApprovedForAll(owner, auth)) {\n                revert ERC721InvalidApprover(auth);\n            }\n\n            if (emitEvent) {\n                emit Approval(owner, to, tokenId);\n            }\n        }\n\n        _tokenApprovals[tokenId] = to;\n    }\n\n    /**\n     * @dev Approve `operator` to operate on all of `owner` tokens\n     *\n     * Requirements:\n     * - operator can't be the address zero.\n     *\n     * Emits an {ApprovalForAll} event.\n     */\n    function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {\n        if (operator == address(0)) {\n            revert ERC721InvalidOperator(operator);\n        }\n        _operatorApprovals[owner][operator] = approved;\n        emit ApprovalForAll(owner, operator, approved);\n    }\n\n    /**\n     * @dev Reverts if the `tokenId` doesn't have a current owner (it hasn't been minted, or it has been burned).\n     * Returns the owner.\n     *\n     * Overrides to ownership logic should be done to {_ownerOf}.\n     */\n    function _requireOwned(uint256 tokenId) internal view returns (address) {\n        address owner = _ownerOf(tokenId);\n        if (owner == address(0)) {\n            revert ERC721NonexistentToken(tokenId);\n        }\n        return owner;\n    }\n\n    /**\n     * @dev Private function to invoke {IERC721Receiver-onERC721Received} on a target address. This will revert if the\n     * recipient doesn't accept the token transfer. The call is not executed if the target address is not a contract.\n     *\n     * @param from address representing the previous owner of the given token ID\n     * @param to target address that will receive the tokens\n     * @param tokenId uint256 ID of the token to be transferred\n     * @param data bytes optional data to send along with the call\n     */\n    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory data) private {\n        if (to.code.length > 0) {\n            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {\n                if (retval != IERC721Receiver.onERC721Received.selector) {\n                    revert ERC721InvalidReceiver(to);\n                }\n            } catch (bytes memory reason) {\n                if (reason.length == 0) {\n                    revert ERC721InvalidReceiver(to);\n                } else {\n                    /// @solidity memory-safe-assembly\n                    assembly {\n                        revert(add(32, reason), mload(reason))\n                    }\n                }\n            }\n        }\n    }\n}\n\n// File: @openzeppelin/contracts/interfaces/IERC2981.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC2981.sol)\n\n\n\n/**\n * @dev Interface for the NFT Royalty Standard.\n *\n * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal\n * support for royalty payments across all NFT marketplaces and ecosystem participants.\n */\ninterface IERC2981 is IERC165 {\n    /**\n     * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of\n     * exchange. The royalty amount is denominated and should be paid in that same unit of exchange.\n     */\n    function royaltyInfo(\n        uint256 tokenId,\n        uint256 salePrice\n    ) external view returns (address receiver, uint256 royaltyAmount);\n}\n\n// File: @openzeppelin/contracts/token/common/ERC2981.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (token/common/ERC2981.sol)\n\n\n\n/**\n * @dev Implementation of the NFT Royalty Standard, a standardized way to retrieve royalty payment information.\n *\n * Royalty information can be specified globally for all token ids via {_setDefaultRoyalty}, and/or individually for\n * specific token ids via {_setTokenRoyalty}. The latter takes precedence over the first.\n *\n * Royalty is specified as a fraction of sale price. {_feeDenominator} is overridable but defaults to 10000, meaning the\n * fee is specified in basis points by default.\n *\n * IMPORTANT: ERC-2981 only specifies a way to signal royalty information and does not enforce its payment. See\n * https://eips.ethereum.org/EIPS/eip-2981#optional-royalty-payments[Rationale] in the EIP. Marketplaces are expected to\n * voluntarily pay royalties together with sales, but note that this standard is not yet widely supported.\n */\nabstract contract ERC2981 is IERC2981, ERC165 {\n    struct RoyaltyInfo {\n        address receiver;\n        uint96 royaltyFraction;\n    }\n\n    RoyaltyInfo private _defaultRoyaltyInfo;\n    mapping(uint256 tokenId => RoyaltyInfo) private _tokenRoyaltyInfo;\n\n    /**\n     * @dev The default royalty set is invalid (eg. (numerator / denominator) >= 1).\n     */\n    error ERC2981InvalidDefaultRoyalty(uint256 numerator, uint256 denominator);\n\n    /**\n     * @dev The default royalty receiver is invalid.\n     */\n    error ERC2981InvalidDefaultRoyaltyReceiver(address receiver);\n\n    /**\n     * @dev The royalty set for an specific `tokenId` is invalid (eg. (numerator / denominator) >= 1).\n     */\n    error ERC2981InvalidTokenRoyalty(uint256 tokenId, uint256 numerator, uint256 denominator);\n\n    /**\n     * @dev The royalty receiver for `tokenId` is invalid.\n     */\n    error ERC2981InvalidTokenRoyaltyReceiver(uint256 tokenId, address receiver);\n\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC165) returns (bool) {\n        return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId);\n    }\n\n    /**\n     * @inheritdoc IERC2981\n     */\n    function royaltyInfo(uint256 tokenId, uint256 salePrice) public view virtual returns (address, uint256) {\n        RoyaltyInfo memory royalty = _tokenRoyaltyInfo[tokenId];\n\n        if (royalty.receiver == address(0)) {\n            royalty = _defaultRoyaltyInfo;\n        }\n\n        uint256 royaltyAmount = (salePrice * royalty.royaltyFraction) / _feeDenominator();\n\n        return (royalty.receiver, royaltyAmount);\n    }\n\n    /**\n     * @dev The denominator with which to interpret the fee set in {_setTokenRoyalty} and {_setDefaultRoyalty} as a\n     * fraction of the sale price. Defaults to 10000 so fees are expressed in basis points, but may be customized by an\n     * override.\n     */\n    function _feeDenominator() internal pure virtual returns (uint96) {\n        return 10000;\n    }\n\n    /**\n     * @dev Sets the royalty information that all ids in this contract will default to.\n     *\n     * Requirements:\n     *\n     * - `receiver` cannot be the zero address.\n     * - `feeNumerator` cannot be greater than the fee denominator.\n     */\n    function _setDefaultRoyalty(address receiver, uint96 feeNumerator) internal virtual {\n        uint256 denominator = _feeDenominator();\n        if (feeNumerator > denominator) {\n            // Royalty fee will exceed the sale price\n            revert ERC2981InvalidDefaultRoyalty(feeNumerator, denominator);\n        }\n        if (receiver == address(0)) {\n            revert ERC2981InvalidDefaultRoyaltyReceiver(address(0));\n        }\n\n        _defaultRoyaltyInfo = RoyaltyInfo(receiver, feeNumerator);\n    }\n\n    /**\n     * @dev Removes default royalty information.\n     */\n    function _deleteDefaultRoyalty() internal virtual {\n        delete _defaultRoyaltyInfo;\n    }\n\n    /**\n     * @dev Sets the royalty information for a specific token id, overriding the global default.\n     *\n     * Requirements:\n     *\n     * - `receiver` cannot be the zero address.\n     * - `feeNumerator` cannot be greater than the fee denominator.\n     */\n    function _setTokenRoyalty(uint256 tokenId, address receiver, uint96 feeNumerator) internal virtual {\n        uint256 denominator = _feeDenominator();\n        if (feeNumerator > denominator) {\n            // Royalty fee will exceed the sale price\n            revert ERC2981InvalidTokenRoyalty(tokenId, feeNumerator, denominator);\n        }\n        if (receiver == address(0)) {\n            revert ERC2981InvalidTokenRoyaltyReceiver(tokenId, address(0));\n        }\n\n        _tokenRoyaltyInfo[tokenId] = RoyaltyInfo(receiver, feeNumerator);\n    }\n\n    /**\n     * @dev Resets royalty information for the token id back to the global default.\n     */\n    function _resetTokenRoyalty(uint256 tokenId) internal virtual {\n        delete _tokenRoyaltyInfo[tokenId];\n    }\n}\n\n// File: @openzeppelin/contracts/access/Ownable.sol\n// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)\n\n\n\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * The initial owner is set to the address provided by the deployer. This can\n * later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n    address private _owner;\n\n    /**\n     * @dev The caller account is not authorized to perform an operation.\n     */\n    error OwnableUnauthorizedAccount(address account);\n\n    /**\n     * @dev The owner is not a valid owner account. (eg. `address(0)`)\n     */\n    error OwnableInvalidOwner(address owner);\n\n    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n    /**\n     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.\n     */\n    constructor(address initialOwner) {\n        if (initialOwner == address(0)) {\n            revert OwnableInvalidOwner(address(0));\n        }\n        _transferOwnership(initialOwner);\n    }\n\n    /**\n     * @dev Throws if called by any account other than the owner.\n     */\n    modifier onlyOwner() {\n        _checkOwner();\n        _;\n    }\n\n    /**\n     * @dev Returns the address of the current owner.\n     */\n    function owner() public view virtual returns (address) {\n        return _owner;\n    }\n\n    /**\n     * @dev Throws if the sender is not the owner.\n     */\n    function _checkOwner() internal view virtual {\n        if (owner() != _msgSender()) {\n            revert OwnableUnauthorizedAccount(_msgSender());\n        }\n    }\n\n    /**\n     * @dev Leaves the contract without owner. It will not be possible to call\n     * `onlyOwner` functions. Can only be called by the current owner.\n     *\n     * NOTE: Renouncing ownership will leave the contract without an owner,\n     * thereby disabling any functionality that is only available to the owner.\n     */\n    function renounceOwnership() public virtual onlyOwner {\n        _transferOwnership(address(0));\n    }\n\n    /**\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\n     * Can only be called by the current owner.\n     */\n    function transferOwnership(address newOwner) public virtual onlyOwner {\n        if (newOwner == address(0)) {\n            revert OwnableInvalidOwner(address(0));\n        }\n        _transferOwnership(newOwner);\n    }\n\n    /**\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\n     * Internal function without access restriction.\n     */\n    function _transferOwnership(address newOwner) internal virtual {\n        address oldOwner = _owner;\n        _owner = newOwner;\n        emit OwnershipTransferred(oldOwner, newOwner);\n    }\n}\n\n// File: @openzeppelin/contracts/utils/Base64.sol\n// OpenZeppelin Contracts (last updated v5.0.2) (utils/Base64.sol)\n\n\n/**\n * @dev Provides a set of functions to operate with Base64 strings.\n */\nlibrary Base64 {\n    /**\n     * @dev Base64 Encoding/Decoding Table\n     */\n    string internal constant _TABLE = \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\";\n\n    /**\n     * @dev Converts a `bytes` to its Bytes64 `string` representation.\n     */\n    function encode(bytes memory data) internal pure returns (string memory) {\n        /**\n         * Inspired by Brecht Devos (Brechtpd) implementation - MIT licence\n         * https://github.com/Brechtpd/base64/blob/e78d9fd951e7b0977ddca77d92dc85183770daf4/base64.sol\n         */\n        if (data.length == 0) return \"\";\n\n        // Loads the table into memory\n        string memory table = _TABLE;\n\n        // Encoding takes 3 bytes chunks of binary data from `bytes` data parameter\n        // and split into 4 numbers of 6 bits.\n        // The final Base64 length should be `bytes` data length multiplied by 4/3 rounded up\n        // - `data.length + 2`  -> Round up\n        // - `/ 3`              -> Number of 3-bytes chunks\n        // - `4 *`              -> 4 characters for each chunk\n        string memory result = new string(4 * ((data.length + 2) / 3));\n\n        /// @solidity memory-safe-assembly\n        assembly {\n            // Prepare the lookup table (skip the first \"length\" byte)\n            let tablePtr := add(table, 1)\n\n            // Prepare result pointer, jump over length\n            let resultPtr := add(result, 0x20)\n            let dataPtr := data\n            let endPtr := add(data, mload(data))\n\n            // In some cases, the last iteration will read bytes after the end of the data. We cache the value, and\n            // set it to zero to make sure no dirty bytes are read in that section.\n            let afterPtr := add(endPtr, 0x20)\n            let afterCache := mload(afterPtr)\n            mstore(afterPtr, 0x00)\n\n            // Run over the input, 3 bytes at a time\n            for {\n\n            } lt(dataPtr, endPtr) {\n\n            } {\n                // Advance 3 bytes\n                dataPtr := add(dataPtr, 3)\n                let input := mload(dataPtr)\n\n                // To write each character, shift the 3 byte (24 bits) chunk\n                // 4 times in blocks of 6 bits for each character (18, 12, 6, 0)\n                // and apply logical AND with 0x3F to bitmask the least significant 6 bits.\n                // Use this as an index into the lookup table, mload an entire word\n                // so the desired character is in the least significant byte, and\n                // mstore8 this least significant byte into the result and continue.\n\n                mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))))\n                resultPtr := add(resultPtr, 1) // Advance\n\n                mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))))\n                resultPtr := add(resultPtr, 1) // Advance\n\n                mstore8(resultPtr, mload(add(tablePtr, and(shr(6, input), 0x3F))))\n                resultPtr := add(resultPtr, 1) // Advance\n\n                mstore8(resultPtr, mload(add(tablePtr, and(input, 0x3F))))\n                resultPtr := add(resultPtr, 1) // Advance\n            }\n\n            // Reset the value that was cached\n            mstore(afterPtr, afterCache)\n\n            // When data `bytes` is not exactly 3 bytes long\n            // it is padded with `=` characters at the end\n            switch mod(mload(data), 3)\n            case 1 {\n                mstore8(sub(resultPtr, 1), 0x3d)\n                mstore8(sub(resultPtr, 2), 0x3d)\n            }\n            case 2 {\n                mstore8(sub(resultPtr, 1), 0x3d)\n            }\n        }\n\n        return result;\n    }\n}\n\n// File: Dagongmiao.sol\ninterface IAgentIdRegistry {\n    function handleOf(address wallet) external view returns (string memory);\n}\n\n/// @title Dagongmiao - 707 hard-hat office cats clutching giant coffees, the dagongren spirit of the proud daily grinder for .ai Agent ID holders on BNB Chain\n/// @notice Each wallet gets its first mint free while the 353 free pool lasts (gas only).\n/// Every other mint costs 0.00005 BNB. Max 90 per wallet, 707 total. Collectible only, not an investment.\n/// @dev Art and metadata are generated fully on-chain from each token id. No IPFS, no reveal, nothing to set after deploy.\ncontract Dagongmiao is ERC721, ERC2981, Ownable {\n    using Strings for uint256;\n\n    IAgentIdRegistry public constant AGENT_ID = IAgentIdRegistry(0x60B9262456dE011F7d15a54CdD8c48bAaa8B022F);\n    uint256 public constant MAX_SUPPLY = 707;\n    uint256 public constant FREE_SUPPLY = 353;\n    uint256 public constant FREE_PER_WALLET = 1;\n    uint256 public constant MAX_PER_WALLET = 90;\n    uint256 public constant PRICE = 0.00005 ether;\n\n    uint256 public totalSupply;\n    uint256 public freeClaimed;\n    bool public mintOpen = true;\n    mapping(address => uint256) public mintedBy;\n    mapping(address => uint256) public freeUsed;\n\n    error NoAgentId();\n    error OnlyWallets();\n    error MintClosed();\n    error BadQuantity();\n    error SoldOut();\n    error WalletLimit();\n    error WrongPayment();\n    error WithdrawFailed();\n\n    event Launched(address indexed to, uint256 indexed tokenId, string agent);\n\n    constructor(address initialOwner) ERC721(\"Dagongmiao\", \"DAGONGMIAO\") Ownable(initialOwner) {\n        _setDefaultRoyalty(initialOwner, 500); // 5%\n    }\n\n    /// @notice How many of `qty` mints would be free for this wallet right now.\n    function freeFor(address wallet, uint256 qty) public view returns (uint256 n) {\n        uint256 w = FREE_PER_WALLET - freeUsed[wallet];\n        uint256 p = FREE_SUPPLY - freeClaimed;\n        n = w < p ? w : p;\n        if (qty < n) n = qty;\n    }\n\n    /// @notice Free mints this wallet still has (limited by the remaining free pool).\n    function freeLeft(address wallet) external view returns (uint256) {\n        return freeFor(wallet, FREE_PER_WALLET);\n    }\n\n    /// @notice Exact BNB (wei) a wallet must send to mint qty.\n    function quote(address wallet, uint256 qty) public view returns (uint256) {\n        return (qty - freeFor(wallet, qty)) * PRICE;\n    }\n\n    function mint(uint256 qty) external payable {\n        if (msg.sender != tx.origin) revert OnlyWallets();\n        if (!mintOpen) revert MintClosed();\n        if (qty == 0) revert BadQuantity();\n        if (totalSupply + qty > MAX_SUPPLY) revert SoldOut();\n        if (mintedBy[msg.sender] + qty > MAX_PER_WALLET) revert WalletLimit();\n        string memory handle;\n        try AGENT_ID.handleOf(msg.sender) returns (string memory h) {\n            handle = h;\n        } catch {\n            revert NoAgentId();\n        }\n        if (bytes(handle).length == 0) revert NoAgentId();\n        uint256 free = freeFor(msg.sender, qty);\n        if (msg.value != (qty - free) * PRICE) revert WrongPayment();\n\n        if (free > 0) {\n            freeUsed[msg.sender] += free;\n            freeClaimed += free;\n        }\n        mintedBy[msg.sender] += qty;\n        for (uint256 i; i < qty; ++i) {\n            uint256 id = ++totalSupply;\n            _mint(msg.sender, id);\n            emit Launched(msg.sender, id, handle);\n        }\n    }\n\n    // ---------------- on-chain art ----------------\n\n    function _seed(uint256 id) internal pure returns (uint256) {\n        return uint256(keccak256(abi.encodePacked(\"Dagongmiao\", id)));\n    }\n\n    function _r(uint256 s, uint256 i) internal pure returns (uint256) {\n        return uint256(keccak256(abi.encodePacked(s, i)));\n    }\n\n    /// @dev HSL (h 0-359, s and l 0-100) to an rgb() string, which every SVG renderer reads.\n    function _hsl(uint256 h, uint256 s, uint256 l) internal pure returns (string memory) {\n        h %= 360;\n        int256 c = (100 - _abs(int256(2 * l) - 100)) * int256(s) * 255 / 10000;\n        int256 x = c * (60 - _abs(int256(h % 120) - 60)) / 60;\n        int256 m = int256(l) * 255 / 100 - c / 2;\n        int256 r; int256 g; int256 b;\n        if (h < 60) (r, g, b) = (c, x, 0);\n        else if (h < 120) (r, g, b) = (x, c, 0);\n        else if (h < 180) (r, g, b) = (0, c, x);\n        else if (h < 240) (r, g, b) = (0, x, c);\n        else if (h < 300) (r, g, b) = (x, 0, c);\n        else (r, g, b) = (c, 0, x);\n        return string.concat(\"rgb(\", _u(r + m), \",\", _u(g + m), \",\", _u(b + m), \")\");\n    }\n\n    function _abs(int256 v) internal pure returns (int256) {\n        return v < 0 ? -v : v;\n    }\n\n    function _u(int256 v) internal pure returns (string memory) {\n        if (v < 0) v = 0;\n        if (v > 255) v = 255;\n        return uint256(v).toString();\n    }\n\n    function _pick(string[4] memory names, uint256 r) internal pure returns (string memory) {\n        return names[r % 4];\n    }\n\n    function _T1() internal pure returns (string[4] memory) {\n        return [\"Ginger\", \"Snow\", \"Tabby Grey\", \"Cocoa\"];\n    }\n    function _T2() internal pure returns (string[4] memory) {\n        return [\"Brackets\", \"Crunch\", \"Orbit\", \"Off Clock\"];\n    }\n    function _T3() internal pure returns (string[4] memory) {\n        return [\"Star\", \"Crumbs\", \"Clocked In\", \"None\"];\n    }\n    function _T4() internal pure returns (string[4] memory) {\n        return [\"Blinds\", \"Night Shift\", \"Aircon\", \"Wall\"];\n    }\n\n\n    function _bg(uint256 s) internal pure returns (string memory) {\n        return string.concat('<rect width=\"400\" height=\"400\" fill=\"', _hsl(_r(s, 1) % 360, 40, 9), '\"/>', _d((s >> 80) % 4));\n    }\n\n    function _d(uint256 k) internal pure returns (string memory) {\n        if (k == 0) return '<rect x=\"150\" y=\"150\" width=\"100\" height=\"100\" fill=\"none\" stroke=\"#fbbf24\" stroke-width=\"3\" opacity=\"0.22\"/><rect x=\"105\" y=\"105\" width=\"190\" height=\"190\" fill=\"none\" stroke=\"#fbbf24\" stroke-width=\"3\" opacity=\"0.22\"/><rect x=\"60\" y=\"60\" width=\"280\" height=\"280\" fill=\"none\" stroke=\"#fbbf24\" stroke-width=\"3\" opacity=\"0.22\"/><rect x=\"15\" y=\"15\" width=\"370\" height=\"370\" fill=\"none\" stroke=\"#fbbf24\" stroke-width=\"3\" opacity=\"0.22\"/><circle cx=\"140\" cy=\"156\" r=\"1.5\" fill=\"#fde68a\" opacity=\"0.9\"/><circle cx=\"126\" cy=\"349\" r=\"1.5\" fill=\"#fde68a\" opacity=\"0.5\"/><circle cx=\"336\" cy=\"383\" r=\"1.5\" fill=\"#fde68a\" opacity=\"0.5\"/><circle cx=\"44\" cy=\"280\" r=\"1.5\" fill=\"#fde68a\" opacity=\"0.9\"/><circle cx=\"158\" cy=\"23\" r=\"2.5\" fill=\"#fde68a\" opacity=\"0.5\"/><circle cx=\"358\" cy=\"319\" r=\"1\" fill=\"#fde68a\" opacity=\"0.7\"/><circle cx=\"83\" cy=\"51\" r=\"2\" fill=\"#fde68a\" opacity=\"0.7\"/><circle cx=\"389\" cy=\"231\" r=\"1.5\" fill=\"#fde68a\" opacity=\"0.7\"/><circle cx=\"190\" cy=\"127\" r=\"2.5\" fill=\"#fde68a\" opacity=\"0.9\"/><circle cx=\"296\" cy=\"227\" r=\"2\" fill=\"#fde68a\" opacity=\"0.7\"/>';\n        if (k == 1) return '<circle cx=\"147\" cy=\"221\" r=\"2.5\" fill=\"#fde68a\" opacity=\"0.7\"/><circle cx=\"49\" cy=\"163\" r=\"2\" fill=\"#fde68a\" opacity=\"0.5\"/><circle cx=\"45\" cy=\"255\" r=\"1\" fill=\"#fde68a\" opacity=\"0.5\"/><circle cx=\"153\" cy=\"68\" r=\"2\" fill=\"#fde68a\" opacity=\"0.9\"/><circle 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280T200 280T300 280T400 280M0 335Q50 317 100 335T200 335T300 335T400 335M0 390Q50 372 100 390T200 390T300 390T400 390\" fill=\"none\" stroke=\"#fbbf24\" stroke-width=\"3\" opacity=\"0.25\"/><circle cx=\"275\" cy=\"220\" r=\"2\" fill=\"#fde68a\" opacity=\"0.7\"/><circle cx=\"156\" cy=\"97\" r=\"2\" fill=\"#fde68a\" opacity=\"0.5\"/><circle cx=\"21\" cy=\"135\" r=\"2.5\" fill=\"#fde68a\" opacity=\"0.9\"/><circle cx=\"222\" cy=\"137\" r=\"2\" fill=\"#fde68a\" opacity=\"0.9\"/><circle cx=\"358\" cy=\"378\" r=\"2.5\" fill=\"#fde68a\" opacity=\"0.5\"/><circle cx=\"290\" cy=\"39\" r=\"1.5\" fill=\"#fde68a\" opacity=\"0.5\"/><circle cx=\"85\" cy=\"369\" r=\"1.5\" fill=\"#fde68a\" opacity=\"0.7\"/><circle cx=\"284\" cy=\"71\" r=\"1\" fill=\"#fde68a\" opacity=\"0.7\"/>';\n        return '';\n    }\n\n    function _p1(uint256 k) internal pure returns (string memory) {\n        if (k == 0) return '<path d=\"M24 54V24H54M376 346V376H346\" fill=\"none\"/>';\n        if (k == 1) return '<path d=\"M360 30L340 70H362L344 112\" fill=\"none\"/>';\n        if (k == 2) return '<ellipse cx=\"62\" cy=\"70\" rx=\"40\" ry=\"14\" fill=\"none\"/><circle cx=\"62\" cy=\"70\" r=\"8\"/>';\n        return '';\n    }\n\n    function _p2(uint256 k) internal pure returns (string memory) {\n        if (k == 0) return '<path d=\"M350 22L357 40L376 40L361 51L367 69L350 58L333 69L339 51L324 40L343 40Z\" fill=\"#f97316\"/>';\n        if (k == 1) return '<g fill=\"#f97316\"><circle cx=\"40\" cy=\"360\" r=\"6\"/><circle cx=\"62\" cy=\"346\" r=\"4\"/><circle cx=\"78\" cy=\"366\" r=\"3\"/></g>';\n        if (k == 2) return '<g><circle cx=\"356\" cy=\"356\" r=\"22\" fill=\"#f97316\"/><path d=\"M346 356L354 364L368 348\" fill=\"none\" stroke=\"#111\" stroke-width=\"5\"/></g>';\n        return '';\n    }\n\n    function _art(uint256 s) internal pure returns (string memory) {\n        string memory c = [string('#fb923c'), '#f8fafc', '#9ca3af', '#c08457'][s % 4];\n        return string.concat('<g stroke=\"', c, '\" stroke-width=\"3\">', _p1((s >> 8) % 4), '</g>', '<g color=\"', c, '\"><path d=\"M110 360Q110 260 200 255Q290 260 290 360Z\" fill=\"#2563eb\" stroke=\"#0b0b14\" stroke-width=\"5\" stroke-linejoin=\"round\"/><path d=\"M185 262L200 300L215 262\" fill=\"#fff\" stroke=\"#0b0b14\" stroke-width=\"3\"/><path d=\"M196 282L200 330L204 282Z\" fill=\"#dc2626\"/><path d=\"M118 150L132 92L172 128ZM282 150L268 92L228 128Z\" fill=\"currentColor\" stroke=\"#0b0b14\" stroke-width=\"5\" stroke-linejoin=\"round\"/><circle cx=\"200\" cy=\"185\" r=\"85\" fill=\"currentColor\" stroke=\"#0b0b14\" stroke-width=\"5\" stroke-linejoin=\"round\"/><path d=\"M108 138Q200 60 292 138Z\" fill=\"#facc15\" stroke=\"#0b0b14\" stroke-width=\"5\" stroke-linejoin=\"round\"/><rect x=\"98\" y=\"132\" width=\"204\" height=\"16\" rx=\"8\" fill=\"#eab308\" stroke=\"#0b0b14\" stroke-width=\"5\" stroke-linejoin=\"round\"/><path d=\"M150 190Q165 178 180 190M220 190Q235 178 250 190\" fill=\"none\" stroke=\"#0b0b14\" stroke-width=\"6\" stroke-linecap=\"round\"/><path d=\"M192 212L200 220L208 212Z\" fill=\"#f472b6\" stroke=\"#0b0b14\" stroke-width=\"3\"/><path d=\"M200 220Q190 232 180 226M200 220Q210 232 220 226\" fill=\"none\" stroke=\"#0b0b14\" stroke-width=\"4\"/><path d=\"M120 210H90M120 222H92M280 210H310M280 222H308\" stroke=\"#0b0b14\" stroke-width=\"3\"/><path d=\"M262 260H318L312 345H268Z\" fill=\"#fef3c7\" stroke=\"#0b0b14\" stroke-width=\"5\" stroke-linejoin=\"round\"/><rect x=\"258\" y=\"250\" width=\"64\" height=\"16\" rx=\"5\" fill=\"#78350f\"/><path d=\"M318 285Q345 290 316 318\" fill=\"none\" stroke=\"#0b0b14\" stroke-width=\"6\"/><text x=\"200\" y=\"385\" font-family=\"sans-serif\" font-weight=\"bold\" font-size=\"22\" fill=\"#fde047\" text-anchor=\"middle\">DAGONG REN</text></g>', _p2((s >> 16) % 4));\n    }\n\n    function _svg(uint256 s) internal pure returns (string memory) {\n        return string.concat('<svg xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"0 0 400 400\">', _bg(s), _art(s), '</svg>');\n    }\n\n    function _attributes(uint256 s) internal pure returns (string memory) {\n        return string.concat(\n            '[{\"trait_type\":\"Fur\",\"value\":\"', _pick(_T1(), s), '\"},',\n            '{\"trait_type\":\"Overtime\",\"value\":\"', _pick(_T2(), s >> 8), '\"},',\n            '{\"trait_type\":\"Perk\",\"value\":\"', _pick(_T3(), s >> 16), '\"},',\n            '{\"trait_type\":\"Office\",\"value\":\"', _pick(_T4(), s >> 80), '\"}]'\n        );\n    }\n\n    /// @notice The token's SVG image.\n    function image(uint256 id) public view returns (string memory) {\n        _requireOwned(id);\n        return _svg(_seed(id));\n    }\n\n    function tokenURI(uint256 id) public view override returns (string memory) {\n        _requireOwned(id);\n        uint256 s = _seed(id);\n        string memory json = string.concat(\n            '{\"name\":\"Dagongmiao #', id.toString(),\n            '\",\"description\":\"Dagongmiao is 707 hard-hat office cats clutching giant coffees, the dagongren spirit of the proud daily grinder. Art generated fully on-chain on BNB Chain. Minted by .ai Agent ID holders.\",',\n            '\"image\":\"data:image/svg+xml;base64,', Base64.encode(bytes(_svg(s))),\n            '\",\"attributes\":', _attributes(s), '}'\n        );\n        return string.concat(\"data:application/json;base64,\", Base64.encode(bytes(json)));\n    }\n\n    /// @notice Collection-level metadata for marketplaces.\n    function contractURI() external pure returns (string memory) {\n        string memory json = string.concat(\n            '{\"name\":\"Dagongmiao\",\"description\":\"Dagongmiao is 707 hard-hat office cats clutching giant coffees, the dagongren spirit of the proud daily grinder. Art generated fully on-chain on BNB Chain. Mint is gated to .ai Agent ID holders.\",',\n            '\"seller_fee_basis_points\":500}'\n        );\n        return string.concat(\"data:application/json;base64,\", Base64.encode(bytes(json)));\n    }\n\n    // ---------------- owner ----------------\n\n    function setMintOpen(bool open) external onlyOwner {\n        mintOpen = open;\n    }\n\n    function setRoyalty(address receiver, uint96 feeBps) external onlyOwner {\n        _setDefaultRoyalty(receiver, feeBps);\n    }\n\n    function withdraw() external onlyOwner {\n        (bool ok,) = owner().call{value: address(this).balance}(\"\");\n        if (!ok) revert WithdrawFailed();\n    }\n\n    function supportsInterface(bytes4 interfaceId) public view override(ERC721, ERC2981) returns (bool) {\n        return super.supportsInterface(interfaceId);\n    }\n}"}},"abi":[{"type":"constructor","inputs":[{"name":"initialOwner","type":"address","internalType":"address"}],"stateMutability":"nonpayable"},{"name":"BadQuantity","type":"error","inputs":[]},{"name":"ERC2981InvalidDefaultRoyalty","type":"error","inputs":[{"name":"numerator","type":"uint256","internalType":"uint256"},{"name":"denominator","type":"uint256","internalType":"uint256"}]},{"name":"ERC2981InvalidDefaultRoyaltyReceiver","type":"error","inputs":[{"name":"receiver","type":"address","internalType":"address"}]},{"name":"ERC2981InvalidTokenRoyalty","type":"error","inputs":[{"name":"tokenId","type":"uint256","internalType":"uint256"},{"name":"numerator","type":"uint256","internalType":"uint256"},{"name":"denominator","type":"uint256","internalType":"uint256"}]},{"name":"ERC2981InvalidTokenRoyaltyReceiver","type":"error","inputs":[{"name":"tokenId","type":"uint256","internalType":"uint256"},{"name":"receiver","type":"address","internalType":"address"}]},{"name":"ERC721IncorrectOwner","type":"error","inputs":[{"name":"sender","type":"address","internalType":"address"},{"name":"tokenId","type":"uint256","internalType":"uint256"},{"name":"owner","type":"address","internalType":"address"}]},{"name":"ERC721InsufficientApproval","type":"error","inputs":[{"name":"operator","type":"address","internalType":"address"},{"name":"tokenId","type":"uint256","internalType":"uint256"}]},{"name":"ERC721InvalidApprover","type":"error","inputs":[{"name":"approver","type":"address","internalType":"address"}]},{"name":"ERC721InvalidOperator","type":"error","inputs":[{"name":"operator","type":"address","internalType":"address"}]},{"name":"ERC721InvalidOwner","type":"error","inputs":[{"name":"owner","type":"address","internalType":"address"}]},{"name":"ERC721InvalidReceiver","type":"error","inputs":[{"name":"receiver","type":"address","internalType":"address"}]},{"name":"ERC721InvalidSender","type":"error","inputs":[{"name":"sender","type":"address","internalType":"address"}]},{"name":"ERC721NonexistentToken","type":"error","inputs":[{"name":"tokenId","type":"uint256","internalType":"uint256"}]},{"name":"MintClosed","type":"error","inputs":[]},{"name":"NoAgentId","type":"error","inputs":[]},{"name":"OnlyWallets","type":"error","inputs":[]},{"name":"OwnableInvalidOwner","type":"error","inputs":[{"name":"owner","type":"address","internalType":"address"}]},{"name":"OwnableUnauthorizedAccount","type":"error","inputs":[{"name":"account","type":"address","internalType":"address"}]},{"name":"SoldOut","type":"error","inputs":[]},{"name":"WalletLimit","type":"error","inputs":[]},{"name":"WithdrawFailed","type":"error","inputs":[]},{"name":"WrongPayment","type":"error","inputs":[]},{"name":"Approval","type":"event","inputs":[{"name":"owner","type":"address","indexed":true,"internalType":"address"},{"name":"approved","type":"address","indexed":true,"internalType":"address"},{"name":"tokenId","type":"uint256","indexed":true,"internalType":"uint256"}],"anonymous":false},{"name":"ApprovalForAll","type":"event","inputs":[{"name":"owner","type":"address","indexed":true,"internalType":"address"},{"name":"operator","type":"address","indexed":true,"internalType":"address"},{"name":"approved","type":"bool","indexed":false,"internalType":"bool"}],"anonymous":false},{"name":"Launched","type":"event","inputs":[{"name":"to","type":"address","indexed":true,"internalType":"address"},{"name":"tokenId","type":"uint256","indexed":true,"internalType":"uint256"},{"name":"agent","type":"string","indexed":false,"internalType":"string"}],"anonymous":false},{"name":"OwnershipTransferred","type":"event","inputs":[{"name":"previousOwner","type":"address","indexed":true,"internalType":"address"},{"name":"newOwner","type":"address","indexed":true,"internalType":"address"}],"anonymous":false},{"name":"Transfer","type":"event","inputs":[{"name":"from","type":"address","indexed":true,"internalType":"address"},{"name":"to","type":"address","indexed":true,"internalType":"address"},{"name":"tokenId","type":"uint256","indexed":true,"internalType":"uint256"}],"anonymous":false},{"name":"AGENT_ID","type":"function","inputs":[],"outputs":[{"name":"","type":"address","internalType":"contract IAgentIdRegistry"}],"stateMutability":"view"},{"name":"FREE_PER_WALLET","type":"function","inputs":[],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"FREE_SUPPLY","type":"function","inputs":[],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"MAX_PER_WALLET","type":"function","inputs":[],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"MAX_SUPPLY","type":"function","inputs":[],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"PRICE","type":"function","inputs":[],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"approve","type":"function","inputs":[{"name":"to","type":"address","internalType":"address"},{"name":"tokenId","type":"uint256","internalType":"uint256"}],"outputs":[],"stateMutability":"nonpayable"},{"name":"balanceOf","type":"function","inputs":[{"name":"owner","type":"address","internalType":"address"}],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"contractURI","type":"function","inputs":[],"outputs":[{"name":"","type":"string","internalType":"string"}],"stateMutability":"pure"},{"name":"freeClaimed","type":"function","inputs":[],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"freeFor","type":"function","inputs":[{"name":"wallet","type":"address","internalType":"address"},{"name":"qty","type":"uint256","internalType":"uint256"}],"outputs":[{"name":"n","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"freeLeft","type":"function","inputs":[{"name":"wallet","type":"address","internalType":"address"}],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"freeUsed","type":"function","inputs":[{"name":"","type":"address","internalType":"address"}],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"getApproved","type":"function","inputs":[{"name":"tokenId","type":"uint256","internalType":"uint256"}],"outputs":[{"name":"","type":"address","internalType":"address"}],"stateMutability":"view"},{"name":"image","type":"function","inputs":[{"name":"id","type":"uint256","internalType":"uint256"}],"outputs":[{"name":"","type":"string","internalType":"string"}],"stateMutability":"view"},{"name":"isApprovedForAll","type":"function","inputs":[{"name":"owner","type":"address","internalType":"address"},{"name":"operator","type":"address","internalType":"address"}],"outputs":[{"name":"","type":"bool","internalType":"bool"}],"stateMutability":"view"},{"name":"mint","type":"function","inputs":[{"name":"qty","type":"uint256","internalType":"uint256"}],"outputs":[],"stateMutability":"payable"},{"name":"mintOpen","type":"function","inputs":[],"outputs":[{"name":"","type":"bool","internalType":"bool"}],"stateMutability":"view"},{"name":"mintedBy","type":"function","inputs":[{"name":"","type":"address","internalType":"address"}],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"name","type":"function","inputs":[],"outputs":[{"name":"","type":"string","internalType":"string"}],"stateMutability":"view"},{"name":"owner","type":"function","inputs":[],"outputs":[{"name":"","type":"address","internalType":"address"}],"stateMutability":"view"},{"name":"ownerOf","type":"function","inputs":[{"name":"tokenId","type":"uint256","internalType":"uint256"}],"outputs":[{"name":"","type":"address","internalType":"address"}],"stateMutability":"view"},{"name":"quote","type":"function","inputs":[{"name":"wallet","type":"address","internalType":"address"},{"name":"qty","type":"uint256","internalType":"uint256"}],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"renounceOwnership","type":"function","inputs":[],"outputs":[],"stateMutability":"nonpayable"},{"name":"royaltyInfo","type":"function","inputs":[{"name":"tokenId","type":"uint256","internalType":"uint256"},{"name":"salePrice","type":"uint256","internalType":"uint256"}],"outputs":[{"name":"","type":"address","internalType":"address"},{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"safeTransferFrom","type":"function","inputs":[{"name":"from","type":"address","internalType":"address"},{"name":"to","type":"address","internalType":"address"},{"name":"tokenId","type":"uint256","internalType":"uint256"}],"outputs":[],"stateMutability":"nonpayable"},{"name":"safeTransferFrom","type":"function","inputs":[{"name":"from","type":"address","internalType":"address"},{"name":"to","type":"address","internalType":"address"},{"name":"tokenId","type":"uint256","internalType":"uint256"},{"name":"data","type":"bytes","internalType":"bytes"}],"outputs":[],"stateMutability":"nonpayable"},{"name":"setApprovalForAll","type":"function","inputs":[{"name":"operator","type":"address","internalType":"address"},{"name":"approved","type":"bool","internalType":"bool"}],"outputs":[],"stateMutability":"nonpayable"},{"name":"setMintOpen","type":"function","inputs":[{"name":"open","type":"bool","internalType":"bool"}],"outputs":[],"stateMutability":"nonpayable"},{"name":"setRoyalty","type":"function","inputs":[{"name":"receiver","type":"address","internalType":"address"},{"name":"feeBps","type":"uint96","internalType":"uint96"}],"outputs":[],"stateMutability":"nonpayable"},{"name":"supportsInterface","type":"function","inputs":[{"name":"interfaceId","type":"bytes4","internalType":"bytes4"}],"outputs":[{"name":"","type":"bool","internalType":"bool"}],"stateMutability":"view"},{"name":"symbol","type":"function","inputs":[],"outputs":[{"name":"","type":"string","internalType":"string"}],"stateMutability":"view"},{"name":"tokenURI","type":"function","inputs":[{"name":"id","type":"uint256","internalType":"uint256"}],"outputs":[{"name":"","type":"string","internalType":"string"}],"stateMutability":"view"},{"name":"totalSupply","type":"function","inputs":[],"outputs":[{"name":"","type":"uint256","internalType":"uint256"}],"stateMutability":"view"},{"name":"transferFrom","type":"function","inputs":[{"name":"from","type":"address","internalType":"address"},{"name":"to","type":"address","internalType":"address"},{"name":"tokenId","type":"uint256","internalType":"uint256"}],"outputs":[],"stateMutability":"nonpayable"},{"name":"transferOwnership","type":"function","inputs":[{"name":"newOwner","type":"address","internalType":"address"}],"outputs":[],"stateMutability":"nonpayable"},{"name":"withdraw","type":"function","inputs":[],"outputs":[],"stateMutability":"nonpayable"}],"matchId":"57817213","creationMatch":"exact_match","runtimeMatch":"exact_match","verifiedAt":"2026-10-31T11:12:57Z","match":"exact_match","chainId":"56","address":"0xff8C74Cb489065d68c0BD91A9EfA2EC283B7a5F7"}