diff --git a/README.md b/README.md
index 79821ff2..4bb61446 100644
--- a/README.md
+++ b/README.md
@@ -8,4 +8,21 @@ This library is used by different bouncers :
 
 * [Nginx Bouncer](https://docs.crowdsec.net/docs/next/bouncers/nginx)
 * [OpenResty Bouncer](https://docs.crowdsec.net/docs/next/bouncers/openresty)
-* [Ingress Nginx Bouncer](https://docs.crowdsec.net/docs/next/bouncers/ingress-nginx)
\ No newline at end of file
+* [Ingress Nginx Bouncer](https://docs.crowdsec.net/docs/next/bouncers/ingress-nginx)
+
+### ALTCHA Assets Setup
+Vendor Dependency
+This provider requires the ALTCHA JavaScript widget file.
+
+```bash
+wget https://raw.githubusercontent.com/altcha-org/altcha/refs/heads/main/dist/main/altcha.min.js -O templates/altcha.min.js```
+
+
+Configuration needed : 
+CAPTCHA_PROVIDER=altcha
+CAPTCHA_TEMPLATE_PATH=/var/lib/crowdsec/lua/templates/altcha.html
+CAPTCHA_EXPIRATION=432000
+
+Then you need to generate a random key et set SECRET_KEY var 
+Example : 
+```openssl rand -hex 32 ```
\ No newline at end of file
diff --git a/config_example.conf b/config_example.conf
index ec83c401..b560a7f8 100644
--- a/config_example.conf
+++ b/config_example.conf
@@ -30,12 +30,13 @@ BAN_TEMPLATE_PATH=/var/lib/crowdsec/lua/templates/ban.html
 REDIRECT_LOCATION=
 RET_CODE=
 #those apply for "captcha" action
-#valid providers are recaptcha, hcaptcha, turnstile
+#valid providers are recaptcha, hcaptcha, turnstile, altcha
 CAPTCHA_PROVIDER=
-# Captcha Secret Key
+# Captcha Secret Key / or altcha long random string
 SECRET_KEY=
 # Captcha Site key
 SITE_KEY=
+# If altcha selected setup to /var/lib/crowdsec/lua/templates/altcha.html
 CAPTCHA_TEMPLATE_PATH=/var/lib/crowdsec/lua/templates/captcha.html
 CAPTCHA_EXPIRATION=3600
 
diff --git a/lib/plugins/crowdsec/altcha.lua b/lib/plugins/crowdsec/altcha.lua
new file mode 100644
index 00000000..374db73e
--- /dev/null
+++ b/lib/plugins/crowdsec/altcha.lua
@@ -0,0 +1,94 @@
+local ffi = require("ffi")
+
+ffi.cdef[[
+    typedef struct engine_st ENGINE;
+    typedef struct evp_md_st EVP_MD;
+    typedef struct evp_md_ctx_st EVP_MD_CTX;
+
+    const EVP_MD *EVP_sha256(void);
+    unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
+                        const unsigned char *d, size_t n, unsigned char *md,
+                        unsigned int *md_len);
+    unsigned char *SHA256(const unsigned char *d, size_t n, unsigned char *md);
+]]
+
+local M = {}
+
+-- Helper conversion Binaire -> Hexadécimal
+local function to_hex(raw_bytes, len)
+    local hex = {}
+    for i = 0, len - 1 do
+        table.insert(hex, string.format("%02x", raw_bytes[i]))
+    end
+    return table.concat(hex)
+end
+
+-- SHA256 FFI direct OpenSSL
+local function sha256_hex(data)
+    local md = ffi.new("unsigned char[32]")
+    ffi.C.SHA256(data, #data, md)
+    return to_hex(md, 32)
+end
+
+-- HMAC-SHA256 FFI direct OpenSSL
+local function hmac_sha256(key, data)
+    local md = ffi.new("unsigned char[32]")
+    local md_len = ffi.new("unsigned int[1]")
+    local evp_sha256 = ffi.C.EVP_sha256()
+    
+    ffi.C.HMAC(evp_sha256, key, #key, data, #data, md, md_len)
+    return to_hex(md, 32)
+end
+
+-- 1. Création du challenge
+function M.create_challenge(secret, max_number)
+    max_number = max_number or 50000
+    local raw_salt = ngx.encode_base64(ngx.time() .. math.random(1000, 9999))
+    local salt = sha256_hex(raw_salt):sub(1, 16)
+    
+    local number = math.random(0, max_number)
+    local challenge_str = salt .. tostring(number)
+    local challenge = sha256_hex(challenge_str)
+
+    local signature = hmac_sha256(secret, challenge)
+
+    return {
+        algorithm = "SHA-256",
+        challenge = challenge,
+        salt = salt,
+        signature = signature,
+        maxnumber = max_number
+    }
+end
+
+-- 2. Vérification du payload
+function M.verify_payload(secret, payload_base64)
+    if not payload_base64 or payload_base64 == "" then
+        return false, "payload missing"
+    end
+
+    local decoded = ngx.decode_base64(payload_base64)
+    if not decoded then
+        return false, "invalid base64"
+    end
+
+    local cjson = require("cjson")
+    local ok, data = pcall(cjson.decode, decoded)
+    if not ok or type(data) ~= "table" then
+        return false, "invalid json payload"
+    end
+
+    local expected_signature = hmac_sha256(secret, data.challenge)
+    if expected_signature ~= data.signature then
+        return false, "invalid signature"
+    end
+
+    local computed_hash = sha256_hex(data.salt .. tostring(data.number))
+    if computed_hash ~= data.challenge then
+        return false, "invalid pow solution"
+    end
+
+    return true, nil
+end
+
+return M
diff --git a/lib/plugins/crowdsec/captcha.lua b/lib/plugins/crowdsec/captcha.lua
index 81d54346..ca1bd296 100644
--- a/lib/plugins/crowdsec/captcha.lua
+++ b/lib/plugins/crowdsec/captcha.lua
@@ -2,6 +2,7 @@ local http = require "resty.http"
 local cjson = require "cjson"
 local template = require "plugins.crowdsec.template"
 local utils = require "plugins.crowdsec.utils"
+local altcha = require "plugins.crowdsec.altcha"
 
 local M = {_TYPE='module', _NAME='recaptcha.funcs', _VERSION='1.0-0'}
 
@@ -9,16 +10,19 @@ local captcha_backend_url = {}
 captcha_backend_url["recaptcha"] = "https://www.recaptcha.net/recaptcha/api/siteverify"
 captcha_backend_url["hcaptcha"] = "https://hcaptcha.com/siteverify"
 captcha_backend_url["turnstile"] = "https://challenges.cloudflare.com/turnstile/v0/siteverify"
+captcha_backend_url["altcha"] = ""
 
 local captcha_frontend_js = {}
 captcha_frontend_js["recaptcha"] = "https://www.recaptcha.net/recaptcha/api.js"
 captcha_frontend_js["hcaptcha"] = "https://js.hcaptcha.com/1/api.js"
 captcha_frontend_js["turnstile"] = "https://challenges.cloudflare.com/turnstile/v0/api.js"
+captcha_frontend_js["altcha"] = ""
 
 local captcha_frontend_key = {}
 captcha_frontend_key["recaptcha"] = "g-recaptcha"
 captcha_frontend_key["hcaptcha"] = "h-captcha"
 captcha_frontend_key["turnstile"] = "cf-turnstile"
+captcha_frontend_key["altcha"] = "altcha"
 
 M.SecretKey = ""
 M.SiteKey = ""
@@ -26,12 +30,12 @@ M.Template = ""
 M.ret_code = ngx.HTTP_OK
 
 function M.New(siteKey, secretKey, TemplateFilePath, captcha_provider, ret_code)
+    M.CaptchaProvider = captcha_provider
 
-    if siteKey == nil or siteKey == "" then
+    if (siteKey == nil or siteKey == "") and M.CaptchaProvider ~= "altcha" then
       return "no recaptcha site key provided, can't use recaptcha"
     end
     M.SiteKey = siteKey
-
     if secretKey == nil or secretKey == "" then
       return "no recaptcha secret key provided, can't use recaptcha"
     end
@@ -50,8 +54,6 @@ function M.New(siteKey, secretKey, TemplateFilePath, captcha_provider, ret_code)
         return "Template file " .. TemplateFilePath .. "not found."
     end
 
-    M.CaptchaProvider = captcha_provider
-
     local ret_code_ok = false
     if ret_code ~= nil and ret_code ~= 0 and ret_code ~= "" then
         for k, v in pairs(utils.HTTP_CODE) do
@@ -67,7 +69,7 @@ function M.New(siteKey, secretKey, TemplateFilePath, captcha_provider, ret_code)
     end
 
     local template_data = {}
-    template_data["captcha_site_key"] =  M.SiteKey
+    template_data["captcha_site_key"] = M.SiteKey
     template_data["captcha_frontend_js"] = captcha_frontend_js[M.CaptchaProvider]
     template_data["captcha_frontend_key"] = captcha_frontend_key[M.CaptchaProvider]
     local view = template.compile(captcha_template, template_data)
@@ -95,6 +97,17 @@ function table_to_encoded_url(args)
 end
 
 function M.Validate(captcha_res, remote_ip)
+    if M.CaptchaProvider == "altcha" then
+        local unescaped_res = ngx.unescape_uri(captcha_res)
+        local ok, err = altcha.verify_payload(M.SecretKey, unescaped_res)
+        if not ok then
+            ngx.log(ngx.ERR, "ALTCHA validation failed : ", err)
+            return false, err
+        end
+        return true, nil
+    end
+
+
     local body = {
         secret   = M.SecretKey,
         response = captcha_res,
diff --git a/templates/altcha.html b/templates/altcha.html
new file mode 100644
index 00000000..c22266e7
--- /dev/null
+++ b/templates/altcha.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<html lang="fr">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title id="page-title">Vérification de sécurité</title>
+</head>
+<body style="display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100vh; margin: 0; font-family: sans-serif; text-align: center; background: #f4f6f8;">
+
+    <p id="msg-instruction">Veuillez valider la vérification ci-dessous pour accéder au site.</p>
+
+    <form id="captcha-form" method="POST" action="/">
+        <altcha-widget id="captcha-widget" challengeurl="/altcha-challenge" name="altcha-response" auto="onload"></altcha-widget>
+        <br><br>
+        <button type="submit" id="btn-submit" style="padding: 5px 15px;">Ok</button>
+    </form>
+
+    <!-- Script de traduction (Exécuté AVANT le chargement du widget) -->
+    <script>
+        // Détection fiable de la langue principale
+        const userLangs = navigator.languages || [navigator.language || ''];
+        const primaryLang = (userLangs[0] || '').toLowerCase();
+        
+        // Est-ce que la PREMIÈRE langue préférée commence par 'fr' ?
+        const isFr = primaryLang.startsWith('fr');
+
+        // Met à jour la balise HTML lang pour être propre
+        document.documentElement.lang = isFr ? 'fr' : 'en';
+
+        // Mise à jour des textes
+        document.getElementById('page-title').textContent = isFr ? 'Vérification de sécurité' : 'Security verification';
+        document.getElementById('msg-instruction').textContent = isFr 
+            ? 'Veuillez valider la vérification ci-dessous pour accéder au site.' 
+            : 'Please complete the verification below to access the site.';
+
+        if (!isFr) {
+            const widget = document.getElementById('captcha-widget');
+            if (widget) {
+                widget.setAttribute('data-label', "I'm not a robot");
+                widget.setAttribute('data-verifying', "Verifying...");
+                widget.setAttribute('data-verified', "Verified");
+                widget.setAttribute('data-error', "Verification failed");
+                widget.setAttribute('data-expired', "Expired");
+            }
+        }
+    </script>
+
+    <!-- Chargement d'ALTCHA -->
+    <script type="module" src="/altcha.js"></script>
+
+    <!-- Auto-submit -->
+    <script type="module">
+        const widget = document.getElementById('captcha-widget');
+        const form = document.getElementById('captcha-form');
+
+        if (widget) {
+            widget.addEventListener('statechange', (event) => {
+                if (event.detail && event.detail.state === 'verified') {
+                    setTimeout(() => {
+                        form.submit();
+                    }, 300); 
+                }
+            });
+        }
+    </script>
+</body>
+</html>
diff --git a/templates/altcha.min.js b/templates/altcha.min.js
new file mode 100644
index 00000000..a63b8157
--- /dev/null
+++ b/templates/altcha.min.js
@@ -0,0 +1 @@
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    throw new Error(`Hex string must have an even length. Got: ${hex}`);\n    }\n    const buffer = new ArrayBuffer(hex.length / 2);\n    const view = new DataView(buffer);\n    for (let i = 0; i < hex.length; i += 2) {\n      const byteString = hex.substring(i, i + 2);\n      const byteValue = parseInt(byteString, 16);\n      view.setUint8(i / 2, byteValue);\n    }\n    return new Uint8Array(buffer);\n  }\n  async function delay(ms) {\n    await new Promise((resolve) => setTimeout(resolve, ms));\n  }\n  function timeDuration(start) {\n    return Math.floor((performance.now() - start) * 10) / 10;\n  }\n  class PasswordBuffer {\n    constructor(nonce, mode = "uint32") {\n      this.nonce = nonce;\n      this.mode = mode;\n      this.buffer = new Uint8Array(this.nonce.length + this.COUNTER_BYTES);\n      this.buffer.set(this.nonce, 0);\n      this.dataView = new DataView(this.buffer.buffer);\n    }\n    nonce;\n    mode;\n    COUNTER_BYTES = 4;\n    buffer;\n    dataView;\n    encoder = new TextEncoder();\n    /**\n     * Appends the counter to the nonce buffer.\n     * In \'string\' mode, encodes the counter as a UTF-8 string.\n     * In \'uint32\' mode, writes the counter as a big-endian 32-bit integer.\n     */\n    setCounter(n) {\n      if (this.mode === "string") {\n        return concatBuffers(this.nonce, this.encoder.encode(n.toString()));\n      }\n      this.dataView.setUint32(this.nonce.length, n, false);\n      return this.buffer;\n    }\n  }\n  async function solveChallenge(options) {\n    const {\n      challenge,\n      controller,\n      counterMode = "uint32",\n      counterStart = 0,\n      counterStep = 1,\n      deriveKey: deriveKey2,\n      timeout = 9e4\n    } = options;\n    const { nonce, keyPrefix, salt } = challenge.parameters;\n    const nonceBuf = hexToBuffer(nonce);\n    const saltBuf = hexToBuffer(salt);\n    const keyPrefixBuf = keyPrefix.length % 2 === 0 ? hexToBuffer(keyPrefix) : null;\n    const password = new PasswordBuffer(nonceBuf, counterMode);\n    const start = performance.now();\n    let counter = counterStart;\n    let iterations = 0;\n    let derivedKeyHex = "";\n    let lastYield = start;\n    while (true) {\n      if (controller?.signal.aborted || timeout && iterations % 10 === 0 && performance.now() - start > timeout) {\n        return null;\n      }\n      const { derivedKey } = await deriveKey2(\n        challenge.parameters,\n        saltBuf,\n        password.setCounter(counter)\n      );\n      if (iterations % 10 === 0 && performance.now() - lastYield > 200) {\n        await delay(0);\n        lastYield = performance.now();\n      }\n      if (keyPrefixBuf ? bufferStartsWith(derivedKey, keyPrefixBuf) : bufferToHex(derivedKey).startsWith(keyPrefix)) {\n        derivedKeyHex = bufferToHex(derivedKey);\n        break;\n      }\n      counter = counter + counterStep;\n      iterations = iterations + 1;\n    }\n    return {\n      counter,\n      derivedKey: derivedKeyHex,\n      time: timeDuration(start)\n    };\n  }\n  function handler(options) {\n    const { deriveKey: deriveKey2 } = options;\n    let controller = void 0;\n    self.onmessage = async (message) => {\n      const { challenge, counterMode, counterStart, counterStep, timeout, type } = message.data;\n      if (type === "abort") {\n        controller?.abort();\n      } else if (type === "work") {\n        controller = new AbortController();\n        let solution;\n        try {\n          solution = await solveChallenge({\n            challenge,\n            controller,\n            counterStart,\n            counterStep,\n            deriveKey: deriveKey2,\n            counterMode,\n            timeout\n          });\n        } catch (err) {\n          return self.postMessage({ error: err });\n        }\n        self.postMessage(solution);\n      }\n    };\n  }\n  function getDigest(algorithm) {\n    switch (algorithm) {\n      case "PBKDF2/SHA-512":\n        return "SHA-512";\n      case "PBKDF2/SHA-384":\n        return "SHA-384";\n      case "PBKDF2/SHA-256":\n      default:\n        return "SHA-256";\n    }\n  }\n  async function deriveKey(parameters, salt, password) {\n    const { algorithm, cost, keyLength = 32 } = parameters;\n    const passwordKey = await crypto.subtle.importKey(\n      "raw",\n      password,\n      { name: "PBKDF2" },\n      false,\n      ["deriveKey"]\n    );\n    const derivedKey = await crypto.subtle.deriveKey(\n      {\n        name: "PBKDF2",\n        salt,\n        iterations: cost,\n        hash: getDigest(algorithm)\n      },\n      passwordKey,\n      { name: "AES-GCM", length: keyLength * 8 },\n      true,\n      ["encrypt"]\n    );\n    return {\n      derivedKey: new Uint8Array(await crypto.subtle.exportKey("raw", derivedKey))\n    };\n  }\n  handler({\n    deriveKey\n  });\n})();\n',za="undefined"!=typeof self&&self.Blob&&new Blob(["(self.URL || self.webkitURL).revokeObjectURL(self.location.href);",Na],{type:"text/javascript;charset=utf-8"});function ja(e){let t;try{if(t=za&&(self.URL||self.webkitURL).createObjectURL(za),!t)throw"";const n=new Worker(t,{name:e?.name});return n.addEventListener("error",()=>{(self.URL||self.webkitURL).revokeObjectURL(t)}),n}catch(t){return new Worker("data:text/javascript;charset=utf-8,"+encodeURIComponent(Na),{name:e?.name})}}const Ba='(function() {\n  "use strict";\n  function bufferStartsWith(buffer, prefix) {\n    if (prefix.length > buffer.length) {\n      return false;\n    }\n    for (let i = 0; i < prefix.length; i++) {\n      if (buffer[i] !== prefix[i]) {\n        return false;\n      }\n    }\n    return true;\n  }\n  function bufferToHex(buffer) {\n    return Array.from(new Uint8Array(buffer)).map((b) => b.toString(16).padStart(2, "0")).join("");\n  }\n  function concatBuffers(a, b) {\n    const out = new Uint8Array(a.length + b.length);\n    out.set(a, 0);\n    out.set(b, a.length);\n    return out;\n  }\n  function hexToBuffer(hex) {\n    if (hex.length % 2 !== 0) {\n      throw new Error(`Hex string must have an even length. Got: ${hex}`);\n    }\n    const buffer = new ArrayBuffer(hex.length / 2);\n    const view = new DataView(buffer);\n    for (let i = 0; i < hex.length; i += 2) {\n      const byteString = hex.substring(i, i + 2);\n      const byteValue = parseInt(byteString, 16);\n      view.setUint8(i / 2, byteValue);\n    }\n    return new Uint8Array(buffer);\n  }\n  async function delay(ms) {\n    await new Promise((resolve) => setTimeout(resolve, ms));\n  }\n  function timeDuration(start) {\n    return Math.floor((performance.now() - start) * 10) / 10;\n  }\n  class PasswordBuffer {\n    constructor(nonce, mode = "uint32") {\n      this.nonce = nonce;\n      this.mode = mode;\n      this.buffer = new Uint8Array(this.nonce.length + this.COUNTER_BYTES);\n      this.buffer.set(this.nonce, 0);\n      this.dataView = new DataView(this.buffer.buffer);\n    }\n    nonce;\n    mode;\n    COUNTER_BYTES = 4;\n    buffer;\n    dataView;\n    encoder = new TextEncoder();\n    /**\n     * Appends the counter to the nonce buffer.\n     * In \'string\' mode, encodes the counter as a UTF-8 string.\n     * In \'uint32\' mode, writes the counter as a big-endian 32-bit integer.\n     */\n    setCounter(n) {\n      if (this.mode === "string") {\n        return concatBuffers(this.nonce, this.encoder.encode(n.toString()));\n      }\n      this.dataView.setUint32(this.nonce.length, n, false);\n      return this.buffer;\n    }\n  }\n  async function solveChallenge(options) {\n    const {\n      challenge,\n      controller,\n      counterMode = "uint32",\n      counterStart = 0,\n      counterStep = 1,\n      deriveKey: deriveKey2,\n      timeout = 9e4\n    } = options;\n    const { nonce, keyPrefix, salt } = challenge.parameters;\n    const nonceBuf = hexToBuffer(nonce);\n    const saltBuf = hexToBuffer(salt);\n    const keyPrefixBuf = keyPrefix.length % 2 === 0 ? hexToBuffer(keyPrefix) : null;\n    const password = new PasswordBuffer(nonceBuf, counterMode);\n    const start = performance.now();\n    let counter = counterStart;\n    let iterations = 0;\n    let derivedKeyHex = "";\n    let lastYield = start;\n    while (true) {\n      if (controller?.signal.aborted || timeout && iterations % 10 === 0 && performance.now() - start > timeout) {\n        return null;\n      }\n      const { derivedKey } = await deriveKey2(\n        challenge.parameters,\n        saltBuf,\n        password.setCounter(counter)\n      );\n      if (iterations % 10 === 0 && performance.now() - lastYield > 200) {\n        await delay(0);\n        lastYield = performance.now();\n      }\n      if (keyPrefixBuf ? bufferStartsWith(derivedKey, keyPrefixBuf) : bufferToHex(derivedKey).startsWith(keyPrefix)) {\n        derivedKeyHex = bufferToHex(derivedKey);\n        break;\n      }\n      counter = counter + counterStep;\n      iterations = iterations + 1;\n    }\n    return {\n      counter,\n      derivedKey: derivedKeyHex,\n      time: timeDuration(start)\n    };\n  }\n  function handler(options) {\n    const { deriveKey: deriveKey2 } = options;\n    let controller = void 0;\n    self.onmessage = async (message) => {\n      const { challenge, counterMode, counterStart, counterStep, timeout, type } = message.data;\n      if (type === "abort") {\n        controller?.abort();\n      } else if (type === "work") {\n        controller = new AbortController();\n        let solution;\n        try {\n          solution = await solveChallenge({\n            challenge,\n            controller,\n            counterStart,\n            counterStep,\n            deriveKey: deriveKey2,\n            counterMode,\n            timeout\n          });\n        } catch (err) {\n          return self.postMessage({ error: err });\n        }\n        self.postMessage(solution);\n      }\n    };\n  }\n  async function deriveKey(parameters, salt, password) {\n    const { algorithm, keyLength = 32 } = parameters;\n    const iterations = Math.max(1, parameters.cost);\n    let data = void 0;\n    let derivedKey = void 0;\n    for (let i = 0; i < iterations; i++) {\n      if (i === 0) {\n        data = concatBuffers(salt, password);\n      } else {\n        data = derivedKey;\n      }\n      derivedKey = new Uint8Array(\n        (await crypto.subtle.digest(algorithm, data)).slice(0, keyLength)\n      );\n    }\n    return {\n      parameters: {},\n      derivedKey\n    };\n  }\n  handler({\n    deriveKey\n  });\n})();\n',Fa="undefined"!=typeof self&&self.Blob&&new Blob(["(self.URL || self.webkitURL).revokeObjectURL(self.location.href);",Ba],{type:"text/javascript;charset=utf-8"});function Ha(e){let t;try{if(t=Fa&&(self.URL||self.webkitURL).createObjectURL(Fa),!t)throw"";const n=new Worker(t,{name:e?.name});return n.addEventListener("error",()=>{(self.URL||self.webkitURL).revokeObjectURL(t)}),n}catch(t){return new Worker("data:text/javascript;charset=utf-8,"+encodeURIComponent(Ba),{name:e?.name})}}!function(e,t="altcha-css"){if("undefined"!=typeof document&&document&&!document.getElementById(t)){const n=document.createElement("style");n.id=t,n.textContent=e;const r=document.currentScript?.nonce??document.querySelector('meta[name="csp-nonce"]')?.content;r&&(n.nonce=r),document.head.appendChild(n)}}(':root {\n  --altcha-border-color: var(--altcha-color-neutral);\n  --altcha-border-width: 1px;\n  --altcha-border-radius: 6px;\n  --altcha-color-base: light-dark(oklch(100% 0.00011 271.152), oklch(20.904% 0.00002 271.152));\n  --altcha-color-base-content: light-dark(\n  \toklch(20.904% 0.00002 271.152),\n  \toklch(100% 0.00011 271.152)\n  );\n  --altcha-color-error: oklch(51.284% 0.20527 28.678);\n  --altcha-color-error-content: oklch(100% 0.00011 271.152);\n  --altcha-color-neutral: light-dark(oklch(83.591% 0.0001 271.152), oklch(46.04% 0.00005 271.152));\n  --altcha-color-neutral-content: light-dark(\n  \toklch(46.76% 0.00005 271.152),\n  \toklch(100% 0.00011 271.152)\n  );\n  --altcha-color-primary: oklch(40.279% 0.2449 268.131);\n  --altcha-color-primary-content: oklch(100% 0.00011 271.152);\n  --altcha-color-success: oklch(55.748% 0.18968 142.511);\n  --altcha-color-success-content: oklch(100% 0.00011 271.152);\n  --altcha-checkbox-border-color: light-dark(\n  \toklch(66.494% 0.00233 15.434),\n  \toklch(51.028% 0.00006 271.152)\n  );\n  --altcha-checkbox-border-radius: 5px;\n  --altcha-checkbox-border-width: var(--altcha-border-width);\n  --altcha-checkbox-outline: 2px solid var(--altcha-checkbox-outline-color);\n  --altcha-checkbox-outline-color: -webkit-focus-ring-color;\n  --altcha-checkbox-outline-offset: 2px;\n  --altcha-checkbox-size: 22px;\n  --altcha-checkbox-transition-duration: var(--altcha-transition-duration);\n  --altcha-input-background-color: var(--altcha-color-base);\n  --altcha-input-border-radius: 3px;\n  --altcha-input-border-width: 1px;\n  --altcha-input-color: var(--altcha-color-base-content);\n  --altcha-max-width: 320px;\n  --altcha-padding: 0.75rem;\n  --altcha-popover-arrow-size: 6px;\n  --altcha-popover-color: var(--altcha-border-color);\n  --altcha-shadow: drop-shadow(3px 3px 6px oklch(0% 0 0 / 0.2));\n  --altcha-spinner-color: var(--altcha-color-base-content);\n  --altcha-switch-background-color: var(--altcha-color-neutral);\n  --altcha-switch-border-radius: calc(infinity * 1px);\n  --altcha-switch-height: var(--altcha-checkbox-size);\n  --altcha-switch-padding: 0.25rem;\n  --altcha-switch-width: calc(var(--altcha-checkbox-size) * 1.75);\n  --altcha-switch-toggle-border-radius: 100%;\n  --altcha-switch-toggle-color: var(--altcha-color-neutral-content);\n  --altcha-switch-toggle-size: calc(\n  \tvar(--altcha-switch-height) - calc(var(--altcha-switch-padding) * 2)\n  );\n  --altcha-transition-duration: 0.6s;\n  --altcha-z-index: 99999999;\n  --altcha-z-index-popover: 999999999;\n}\n\n@supports (-moz-appearance: none) {\n  :root {\n    --altcha-checkbox-outline-color: var(--altcha-color-primary);\n  }\n}\n.altcha {\n  all: revert-layer;\n  display: none;\n  font-family: inherit;\n  font-size: inherit;\n  position: relative;\n}\n.altcha[data-visible] {\n  display: block;\n}\n.altcha-popover, .altcha-popover * {\n  all: revert-layer;\n  box-sizing: border-box;\n  font-family: inherit;\n  font-size: inherit;\n  line-height: 1.25;\n}\n.altcha * {\n  all: revert-layer;\n  box-sizing: border-box;\n  font-family: inherit;\n  font-size: inherit;\n  line-height: 1.25;\n}\n.altcha a, .altcha-popover a {\n  color: currentColor;\n  text-decoration: none;\n}\n.altcha a:hover, .altcha-popover a:hover {\n  color: currentColor;\n}\n.altcha-main {\n  align-items: start;\n  background-color: var(--altcha-color-base);\n  border: var(--altcha-border-width, 1px) solid var(--altcha-border-color);\n  border-radius: var(--altcha-border-radius, 0);\n  color: var(--altcha-color-base-content);\n  display: flex;\n  flex-direction: column;\n  gap: 0.5rem;\n  justify-content: space-between;\n  padding: var(--altcha-padding);\n  max-width: var(--altcha-max-width, 100%);\n}\n.altcha-main > * {\n  display: flex;\n  width: 100%;\n}\n.altcha-main > *:first-child {\n  flex-grow: 1;\n}\n.altcha-checkbox-wrap {\n  align-items: center;\n  display: flex;\n  flex-direction: row;\n  flex-grow: 1;\n  gap: 0.5rem;\n}\n.altcha-checkbox-wrap > * {\n  display: flex;\n}\n.altcha-logo {\n  opacity: 0.7;\n}\n.altcha-footer {\n  align-items: center;\n  display: flex;\n  flex-grow: 1;\n  gap: 0.5rem;\n  justify-content: flex-end;\n  font-size: 0.7rem;\n  opacity: 0.7;\n}\n.altcha-footer p {\n  margin: 0;\n  padding: 0;\n}\n.altcha-error {\n  font-size: 0.85rem;\n}\n.altcha-button {\n  align-items: center;\n  background: var(--altcha-color-primary);\n  border: var(--altcha-input-border-width) solid var(--altcha-color-primary);\n  border-radius: var(--altcha-input-border-radius);\n  color: var(--altcha-color-primary-content);\n  cursor: pointer;\n  display: flex;\n  font-size: 0.9rem;\n  gap: 0.5rem;\n  padding: 0.35rem;\n}\n.altcha-button:focus {\n  border-color: var(--altcha-color-primary);\n  outline: var(--altcha-checkbox-outline);\n  outline-offset: var(--altcha-checkbox-outline-offset);\n}\n.altcha-button > .altcha-spinner, .altcha-button > svg {\n  height: 20px;\n  width: 20px;\n}\n.altcha-button-secondary {\n  background: transparent;\n  border-color: var(--altcha-color-neutral);\n  color: var(--altcha-color-neutral-content);\n}\n.altcha-input {\n  background: var(--altcha-input-background-color);\n  border: var(--altcha-input-border-width) solid var(--altcha-color-neutral);\n  border-radius: var(--altcha-input-border-radius);\n  color: var(--altcha-input-color);\n  flex-grow: 1;\n  font-size: 1rem;\n  min-width: 0;\n  padding: 0.25rem;\n  width: auto;\n}\n.altcha-input:focus {\n  border-color: var(--altcha-color-primary);\n  outline: var(--altcha-checkbox-outline);\n  outline-offset: var(--altcha-checkbox-outline-offset);\n}\n.altcha-spinner {\n  animation: altcha-rotate 0.6s linear infinite;\n  border-radius: 100%;\n  border: var(--altcha-checkbox-border-width) solid var(--altcha-spinner-color);\n  border-bottom-color: transparent;\n  border-right-color: transparent;\n  opacity: 0.7;\n}\n.altcha-popover {\n  background-color: var(--altcha-color-base);\n  border: var(--altcha-border-width) solid var(--altcha-border-color);\n  border-radius: var(--altcha-border-radius);\n  color: var(--altcha-color-base-content);\n  filter: var(--altcha-shadow);\n  position: absolute;\n  left: calc(var(--altcha-padding) / 2);\n  max-width: calc(var(--altcha-max-width) - var(--altcha-padding));\n  top: calc(var(--altcha-padding) + var(--altcha-checkbox-size) + var(--altcha-popover-arrow-size));\n  z-index: var(--altcha-z-index-popover);\n}\n.altcha-popover-arrow {\n  border: var(--altcha-popover-arrow-size) solid transparent;\n  border-bottom-color: var(--altcha-popover-color);\n  content: "";\n  height: 0;\n  left: calc(var(--altcha-checkbox-size) / 2);\n  position: absolute;\n  top: calc(var(--altcha-popover-arrow-size) * -2);\n  width: 0;\n}\n.altcha-popover-content {\n  max-height: 100dvh;\n  overflow: auto;\n  padding: var(--altcha-padding);\n}\n.altcha-popover[data-top=true][data-display=standard] {\n  bottom: calc(100% - (var(--altcha-padding) - var(--altcha-popover-arrow-size)));\n  top: auto;\n}\n.altcha-popover[data-top=true][data-display=standard] .altcha-popover-arrow {\n  border-bottom-color: transparent;\n  border-top-color: var(--altcha-popover-color);\n  bottom: calc(var(--altcha-popover-arrow-size) * -2);\n  top: auto;\n}\n.altcha-popover[data-variant=error] {\n  --altcha-popover-color: var(--altcha-color-error);\n  background-color: var(--altcha-color-error);\n  border-color: var(--altcha-color-error);\n  color: var(--altcha-color-error-content);\n}\n.altcha-popover[data-variant=error] .altcha-popover-content {\n  padding: calc(var(--altcha-padding) / 1.5) var(--altcha-padding);\n}\n.altcha-popover[data-display=overlay] {\n  animation: altcha-overlay-slidein 0.5s forwards;\n  left: 50%;\n  position: fixed;\n  top: 45%;\n  transform: translate(-50%, -50%);\n  width: var(--altcha-max-width);\n  z-index: var(--altcha-z-index);\n}\n.altcha-popover[data-display=bottomsheet] {\n  animation: altcha-bottomsheet-slideup 0.5s forwards;\n  border-bottom-left-radius: 0;\n  border-bottom-right-radius: 0;\n  border-bottom: 0;\n  bottom: -100%;\n  left: 50%;\n  position: fixed;\n  top: auto;\n  transform: translate(-50%, 0);\n  width: var(--altcha-max-width);\n  z-index: var(--altcha-z-index);\n}\n.altcha-popover[data-display=bottomsheet] .altcha-popover-content {\n  padding-bottom: calc(var(--altcha-padding) * 2);\n}\n.altcha-popover-backdrop {\n  background: var(--altcha-color-base-content);\n  bottom: 0;\n  left: 0;\n  opacity: 0.1;\n  position: fixed;\n  right: 0;\n  top: 0;\n  transition: opacity 0.5s;\n  z-index: var(--altcha-z-index);\n}\n.altcha-popover-close {\n  color: var(--altcha-color-base-content);\n  cursor: pointer;\n  display: inline-block;\n  font-size: 1rem;\n  height: 1.25rem;\n  line-height: 0.95;\n  position: absolute;\n  right: 0;\n  text-align: center;\n  text-shadow: 0 0 1px var(--altcha-color-base);\n  top: -1.5rem;\n  width: 1.25rem;\n  z-index: var(--altcha-z-index);\n}\n[dir=rtl] .altcha-popover {\n  left: auto;\n  right: calc(var(--altcha-padding) / 2);\n}\n[dir=rtl] .altcha-popover-arrow {\n  left: auto;\n  right: calc(var(--altcha-checkbox-size) / 2);\n}\n[dir=rtl] .altcha-popover-close {\n  left: 0;\n  right: auto;\n}\n.altcha-popover[data-display=bottomsheet] .altcha-footer, .altcha-popover[data-display=overlay] .altcha-footer {\n  align-items: center;\n  justify-content: center;\n  padding-top: 1rem;\n  gap: 0.5rem;\n}\n.altcha-popover[data-display=bottomsheet] .altcha-footer svg, .altcha-popover[data-display=overlay] .altcha-footer svg {\n  height: 18px;\n  width: 18px;\n  vertical-align: middle;\n}\n.altcha-code-challenge > form {\n  display: flex;\n  flex-direction: column;\n  gap: 0.5rem;\n}\n.altcha-code-challenge-title {\n  font-weight: 600;\n}\n.altcha-code-challenge-text {\n  font-size: 0.85rem;\n}\n.altcha-code-challenge-image {\n  background: white;\n  border: var(--altcha-input-border-width) solid var(--altcha-color-neutral);\n  border-radius: var(--altcha-input-border-radius);\n  object-fit: contain;\n  height: 50px;\n}\n.altcha-code-challenge-row {\n  display: flex;\n  gap: 0.5rem;\n}\n.altcha-code-challenge-buttons {\n  align-items: center;\n  display: flex;\n  flex-direction: column;\n  gap: 0.5rem;\n  margin-top: var(--altcha-padding);\n  justify-content: space-between;\n}\n.altcha-code-challenge-buttons button {\n  justify-content: center;\n  width: 100%;\n}\n.altcha-checkbox {\n  cursor: pointer;\n  height: var(--altcha-checkbox-size);\n  position: relative;\n  width: var(--altcha-checkbox-size);\n}\n.altcha-checkbox input {\n  appearance: none;\n  background: var(--altcha-input-background-color);\n  border: var(--altcha-checkbox-border-width, 2px) solid var(--altcha-checkbox-border-color);\n  border-radius: var(--altcha-checkbox-border-radius);\n  cursor: pointer;\n  height: var(--altcha-checkbox-size);\n  left: 0;\n  margin: 0;\n  padding: 0;\n  position: absolute;\n  top: 0;\n  width: var(--altcha-checkbox-size);\n}\n@supports (hanging-punctuation: first) and (font: -apple-system-body) and (-webkit-appearance: none) {\n  .altcha-checkbox input {\n    /* Safari-only: fixes focus outline */\n  }\n  .altcha-checkbox input:focus {\n    outline-width: 2px;\n    outline-style: solid;\n  }\n}\n.altcha-checkbox input:before {\n  border-radius: var(--altcha-checkbox-border-radius);\n  content: "";\n  width: 100%;\n  height: 100%;\n  background: var(--altcha-color-neutral);\n  display: block;\n  transform: scale(0);\n}\n.altcha-checkbox input:checked {\n  background-color: var(--altcha-color-success);\n  border-color: var(--altcha-color-success);\n}\n.altcha-checkbox input:checked::before {\n  background-color: var(--altcha-color-success);\n  opacity: 0;\n  transform: scale(2.2);\n  transition: all var(--altcha-checkbox-transition-duration) ease;\n  transition-delay: 0.1s;\n}\n.altcha-checkbox svg {\n  --altcha-radio-svg-size: calc(var(--altcha-checkbox-size) * 0.5);\n  --altcha-radio-svg-offset: calc(var(--altcha-checkbox-size) * 0.25);\n  fill: none;\n  left: var(--altcha-radio-svg-offset);\n  height: var(--altcha-radio-svg-size);\n  opacity: 0;\n  position: absolute;\n  stroke: currentColor;\n  stroke-width: 2;\n  stroke-linecap: round;\n  stroke-linejoin: round;\n  stroke-dasharray: 16px;\n  stroke-dashoffset: 16px;\n  top: var(--altcha-radio-svg-offset);\n  transform: translate3d(0, 0, 0);\n  width: var(--altcha-radio-svg-size);\n}\n.altcha-checkbox input:checked + svg {\n  color: var(--altcha-color-success-content);\n  opacity: 1;\n  stroke-dashoffset: 0;\n  transition: all var(--altcha-checkbox-transition-duration) ease;\n  transition-delay: 0.1s;\n}\n.altcha-checkbox-spinner {\n  display: none;\n  left: 0;\n  height: var(--altcha-checkbox-size);\n  position: absolute;\n  top: 0;\n  width: var(--altcha-checkbox-size);\n}\n.altcha-checkbox[data-loading=true] input {\n  appearance: none;\n  opacity: 0;\n  pointer-events: none;\n}\n.altcha-checkbox[data-loading=true] .altcha-checkbox-spinner {\n  display: block;\n}\n.altcha-checkbox-native {\n  height: var(--altcha-checkbox-size);\n  position: relative;\n  width: var(--altcha-checkbox-size);\n}\n.altcha-checkbox-native input {\n  height: var(--altcha-checkbox-size);\n  margin: 0;\n  width: var(--altcha-checkbox-size);\n}\n.altcha-checkbox-native-spinner {\n  display: none;\n  left: 0;\n  height: var(--altcha-checkbox-size);\n  position: absolute;\n  top: 0;\n  width: var(--altcha-checkbox-size);\n}\n.altcha-checkbox-native[data-loading=true] input {\n  appearance: none;\n  opacity: 0;\n  pointer-events: none;\n}\n.altcha-checkbox-native[data-loading=true] .altcha-checkbox-native-spinner {\n  display: block;\n}\n.altcha-switch {\n  align-items: center;\n  border-radius: var(--altcha-switch-border-radius);\n  background-color: var(--altcha-switch-background-color);\n  display: flex;\n  height: var(--altcha-switch-height);\n  padding: var(--altcha-switch-padding);\n  position: relative;\n  width: var(--altcha-switch-width);\n}\n.altcha-switch:focus-within {\n  outline: var(--altcha-checkbox-outline);\n  outline-offset: var(--altcha-checkbox-outline-offset);\n}\n.altcha-switch input {\n  appearance: none;\n  cursor: pointer;\n  height: 100%;\n  left: 0;\n  opacity: 0;\n  position: absolute;\n  top: 0;\n  width: 100%;\n}\n.altcha-switch-toggle {\n  align-items: center;\n  background-color: var(--altcha-switch-toggle-color);\n  border-radius: var(--altcha-switch-toggle-border-radius);\n  cursor: pointer;\n  display: flex;\n  height: var(--altcha-switch-toggle-size);\n  justify-content: center;\n  left: var(--altcha-switch-padding);\n  position: absolute;\n  transition: width 150ms ease-out, left 150ms ease-out;\n  width: var(--altcha-switch-toggle-size);\n}\n.altcha-switch-spinner {\n  display: none;\n  height: var(--altcha-switch-toggle-size);\n  width: var(--altcha-switch-toggle-size);\n}\n.altcha-switch[data-loading=true] {\n  pointer-events: none;\n}\n.altcha-switch[data-loading=true] .altcha-switch-spinner {\n  display: block;\n}\n.altcha-switch[data-loading=true] .altcha-switch-toggle {\n  background-color: transparent;\n  left: calc(50% - var(--altcha-switch-toggle-size) / 2);\n}\n[data-state=verified] .altcha-switch {\n  --altcha-switch-background-color: var(--altcha-color-success);\n}\n[data-state=verified] .altcha-switch-toggle {\n  background-color: var(--altcha-color-success-content);\n  left: calc(100% - var(--altcha-switch-height) + var(--altcha-switch-padding));\n}\n[dir=rtl] .altcha-switch-toggle {\n  left: calc(100% - var(--altcha-switch-height) + var(--altcha-switch-padding));\n}\n[dir=rtl][data-state=verified] .altcha-switch-toggle {\n  left: var(--altcha-switch-padding);\n}\n.altcha-floating-arrow {\n  border: 6px solid transparent;\n  border-bottom-color: var(--altcha-border-color);\n  content: "";\n  height: 0;\n  left: 12px;\n  position: absolute;\n  top: -12px;\n  width: 0;\n}\n.altcha-overlay-backdrop {\n  bottom: 0;\n  left: 0;\n  position: fixed;\n  right: 0;\n  top: 0;\n  transition: opacity var(--altcha-transition-duration);\n  z-index: var(--altcha-z-index);\n}\n.altcha-overlay-close {\n  display: inline-block;\n  color: currentColor;\n  cursor: pointer;\n  font-size: 1rem;\n  height: 1rem;\n  line-height: 0.85;\n  position: absolute;\n  right: 0;\n  text-align: center;\n  text-shadow: 0 0 1px var(--altcha-color-base);\n  top: -1.5rem;\n  width: 1rem;\n  z-index: var(--altcha-z-index);\n}\n.altcha[data-display=overlay] {\n  animation: altcha-overlay-slidein var(--altcha-transition-duration) forwards;\n  filter: var(--altcha-shadow);\n  left: 50%;\n  opacity: 0;\n  position: fixed;\n  top: 45%;\n  transform: translate(-50%, -50%);\n  z-index: var(--altcha-z-index);\n}\n.altcha[data-display=overlay] .altcha-main {\n  width: var(--altcha-max-width);\n}\n.altcha[data-display=floating] {\n  display: none;\n  filter: var(--altcha-shadow);\n  left: var(--altcha-floating-left, -100%);\n  position: fixed;\n  top: var(--altcha-floating-top, -100%);\n  z-index: var(--altcha-z-index);\n}\n.altcha[data-display=floating] .altcha-main {\n  width: var(--altcha-max-width);\n}\n.altcha[data-display=floating][data-floating-position=top] .altcha-floating-arrow {\n  border-bottom-color: transparent;\n  border-top-color: var(--altcha-border-color);\n  bottom: -12px;\n  top: auto;\n}\n.altcha[data-display=floating][data-visible] {\n  display: flex;\n}\n.altcha[data-display=bar] {\n  bottom: -100%;\n  filter: var(--altcha-shadow);\n  left: 0;\n  position: fixed;\n  right: 0;\n  transition: bottom var(--altcha-transition-duration), top var(--altcha-transition-duration);\n  z-index: var(--altcha-z-index);\n}\n.altcha[data-display=bar] .altcha-main {\n  align-items: center;\n  border-radius: 0;\n  border-width: var(--altcha-border-width) 0 0 0;\n  flex-direction: row;\n  max-width: 100% !important;\n}\n.altcha[data-display=bar] .altcha-main > * {\n  width: auto;\n}\n.altcha[data-display=bar][data-placement=top] {\n  bottom: auto;\n  top: -100%;\n}\n.altcha[data-display=bar][data-placement=top] .altcha-main {\n  border-width: 0 0 var(--altcha-border-width) 0;\n}\n.altcha[data-display=bar][data-placement=bottom]:not([data-state=unverified]) {\n  bottom: 0;\n}\n.altcha[data-display=bar][data-placement=top]:not([data-state=unverified]) {\n  top: 0;\n}\n.altcha[data-display=invisible] {\n  display: none;\n}\n\n@keyframes altcha-rotate {\n  0% {\n    transform: rotate(0deg);\n  }\n  100% {\n    transform: rotate(360deg);\n  }\n}\n@keyframes altcha-bottomsheet-slideup {\n  100% {\n    bottom: 0;\n  }\n}\n@keyframes altcha-overlay-slidein {\n  100% {\n    opacity: 1;\n    top: 50%;\n  }\n}'),$altcha.algorithms.set("SHA-256",()=>new Ha),$altcha.algorithms.set("SHA-384",()=>new Ha),$altcha.algorithms.set("SHA-512",()=>new Ha),$altcha.algorithms.set("PBKDF2/SHA-256",()=>new ja),$altcha.algorithms.set("PBKDF2/SHA-384",()=>new ja),$altcha.algorithms.set("PBKDF2/SHA-512",()=>new ja);