adicionando o código

prototipo_cadastro/assets/css/custom.css

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+/*body {
+    background: linear-gradient(135deg, #6a11cb, #2575fc);
+}-->*/
+body {
+  background-image: url(/assets/images/bg.jpg);
+  background-repeat: no-repeat;
+  background-size: cover;
+}
+
+.card {
+  border-radius: 15px;
+}

prototipo_cadastro/assets/js/main.js

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+// Cadastro
+const registerForm = document.getElementById("registerForm");
+if (registerForm) {
+  registerForm.addEventListener("submit", (e) => {
+    e.preventDefault();
+    const password = document.getElementById("password").value;
+    const confirmPassword = document.getElementById("confirmPassword").value;
+
+    if (password !== confirmPassword) {
+      alert("❌ As senhas não coincidem!");
+      return;
+    }
+    if (password.length < 6) {
+      alert("⚠️ A senha deve ter pelo menos 6 caracteres!");
+      return;
+    }
+    alert("✅ Simulação de cadastro realizada com sucesso!");
+  });
+}
+
+// Login
+const loginForm = document.getElementById("loginForm");
+if (loginForm) {
+  loginForm.addEventListener("submit", (e) => {
+    e.preventDefault();
+    alert("🔐 Simulação de Login realizada");
+  });
+}
+
+// Recuperar senha
+const forgotForm = document.getElementById("forgotForm");
+if (forgotForm) {
+  forgotForm.addEventListener("submit", (e) => {
+    e.preventDefault();
+    alert("📩 Link de recuperação enviado para seu e-mail!");
+  });
+}

prototipo_cadastro/documentation/bg/License free.txt

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+IMPORTANT NOTICE: This license only applies if you downloaded this content as
+an unsubscribed user. If you are a premium user (ie, you pay a subscription)
+you are bound to the license terms described in the accompanying file
+"License premium.txt".
+
+---------------------
+
+You must attribute the image to its author:
+
+In order to use a content or a part of it, you must attribute it to starline / Freepik,
+so we will be able to continue creating new graphic resources every day.
+
+
+How to attribute it?
+
+For websites:
+
+Please, copy this code on your website to accredit the author:
+<a href="http://www.freepik.com">Designed by starline / Freepik</a>
+
+For printing:
+
+Paste this text on the final work so the authorship is known.
+- For example, in the acknowledgements chapter of a book:
+"Designed by starline / Freepik"
+
+
+You are free to use this image:
+
+- For both personal and commercial projects and to modify it.
+- In a website or presentation template or application or as part of your design.
+
+You are not allowed to:
+
+- Sub-license, resell or rent it.
+- Include it in any online or offline archive or database.
+
+The full terms of the license are described in section 7 of the Freepik
+terms of use, available online in the following link:
+
+  http://www.freepik.com/terms_of_use
+
+The terms described in the above link have precedence over the terms described
+in the present document. In case of disagreement, the Freepik Terms of Use
+will prevail.

prototipo_cadastro/documentation/bg/License premium.txt

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+IMPORTANT NOTICE: This license only applies if you downloaded this content as
+a subscribed (or "premium") user. If you are an unsubscribed user (or "free"
+user) you are bound to the license terms described in the accompanying file
+"License free.txt".
+
+---------------------
+
+You can download from your profile in Freepik a personalized license stating
+your right to use this content as a "premium" user:
+
+  https://profile.freepik.com/my_downloads
+
+You are free to use this image:
+
+- For both personal and commercial projects and to modify it.
+- In a website or presentation template or application or as part of your design.
+
+You are not allowed to:
+
+- Sub-license, resell or rent it.
+- Include it in any online or offline archive or database.
+
+The full terms of the license are described in sections 7 and 8 of the Freepik
+terms of use, available online in the following link:
+
+  http://www.freepik.com/terms_of_use
+
+The terms described in the above link have precedence over the terms described
+in the present document. In case of disagreement, the Freepik Terms of Use
+will prevail.

prototipo_cadastro/forgot-password.html

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+<!DOCTYPE html>
+<html lang="pt-BR">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Recuperar Senha</title>
+  <link href="/assets/css/general.css" rel="stylesheet">
+  <link rel="stylesheet" href="assets/css/custom.css">
+</head>
+
+<body class="bg-light">
+
+  <!-- Header do template -->
+  <header class="shadow-sm">
+    <nav class="navbar navbar-expand-lg navbar-light bg-white">
+      <div class="container">
+        <a class="navbar-brand d-flex align-items-center" href="login.html">
+          <img
+            src="assets/images/logo_teste.png"
+            alt="kbDoc" style="height: 32px;" class="me-2">
+          <span class="fw-bold">nome do site</span>
+          <!-- mudar depois-->
+        </a>
+        <ul class="navbar-nav ms-auto">
+          <li class="nav-item"><a class="nav-link" href="login.html">Página inicial</a></li>
+          <li class="nav-item"><a class="nav-link" href="#">Documentação</a></li>
+          <li class="nav-item">
+            <a href="register.html" class="btn btn-outline-primary">Registrar</a>
+          </li>
+          <li class="nav-item">
+            <a href="login.html" class="btn btn-outline-primary">Entrar</a>
+          </li>
+        </ul>
+      </div>
+    </nav>
+  </header>
+
+  <!-- Conteúdo principal -->
+  <main class="d-flex align-items-center justify-content-center vh-100">
+    <div class="card shadow-lg p-4" style="max-width: 400px; width: 100%;">
+      <h3 class="text-center mb-4">Recuperar Senha</h3>
+      <form id="forgotForm">
+        <div class="mb-3">
+          <label for="email" class="form-label">Digite seu e-mail</label>
+          <input type="email" class="form-control" id="email" placeholder="Seu e-mail cadastrado" required>
+        </div>
+        <div class="d-grid">
+          <button type="submit" class="btn btn-dark">Enviar Link</button>
+        </div>
+        <p class="text-center mt-3 mb-0">
+          <a href="login.html">Voltar ao Login</a>
+        </p>
+      </form>
+    </div>
+  </main>
+
+  <!-- Scripts -->
+  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
+  <script src="assets/js/main.js"></script>
+</body>
+
+</html>

prototipo_cadastro/login.html

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+<!DOCTYPE html>
+<html lang="pt-BR">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Login - kbDoc</title>
+  <link href="/assets/css/general.css" rel="stylesheet">
+  <link rel="stylesheet" href="assets/css/custom.css">
+</head>
+
+<body class="bg-light">
+
+  <!-- Header do template -->
+  <header class="shadow-sm">
+    <nav class="navbar navbar-expand-lg navbar-light bg-white">
+      <div class="container">
+        <a class="navbar-brand d-flex align-items-center" href="login.html">
+          <img
+            src="assets/images/logo_teste.png"
+            alt="kbDoc" style="height: 32px;" class="me-2">
+          <span class="fw-bold">nome do site</span>
+          <!-- mudar depois-->
+        </a>
+        <ul class="navbar-nav ms-auto">
+          <li class="nav-item"><a class="nav-link" href="login.html">Página inicial</a></li>
+          <li class="nav-item"><a class="nav-link" href="#">Documentação</a></li>
+          <li class="nav-item">
+            <a href="register.html" class="btn btn-outline-primary">Registrar</a>
+          </li>
+        </ul>
+      </div>
+    </nav>
+  </header>
+
+  <!-- Conteúdo principal -->
+  <main class="d-flex align-items-center justify-content-center vh-100">
+    <div class="card shadow-lg p-4" style="max-width: 400px; width: 100%;">
+      <h3 class="text-center mb-4">Entrar</h3>
+      <form id="loginForm">
+        <div class="mb-3">
+          <label for="email" class="form-label">E-mail</label>
+          <input type="email" class="form-control" id="email" placeholder="Digite seu e-mail" required>
+        </div>
+        <div class="mb-3">
+          <label for="password" class="form-label">Senha</label>
+          <input type="password" class="form-control" id="password" placeholder="Digite sua senha" required>
+        </div>
+        <div class="d-grid">
+          <button type="submit" class="btn btn-primary">Entrar</button>
+        </div>
+        <p class="text-center mt-3 mb-0">
+          <a href="forgot-password.html">Esqueceu a senha?</a>
+        </p>
+        <p class="text-center mt-2">
+          Não tem conta? <a href="register.html">Cadastrar</a>
+        </p>
+      </form>
+    </div>
+  </main>
+
+  <!-- Scripts -->
+  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
+  <script src="assets/js/main.js"></script>
+</body>
+
+</html>

prototipo_cadastro/register.html

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+<!DOCTYPE html>
+<html lang="pt-BR">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Cadastro</title>
+  <link href="assets/css/general.css" rel="stylesheet">
+  <link rel="stylesheet" href="assets/css/custom.css">
+</head>
+
+<body class="bg-light">
+
+  <!-- Header do template -->
+  <header class="shadow-sm">
+    <nav class="navbar navbar-expand-lg navbar-light bg-white">
+      <div class="container">
+        <a class="navbar-brand d-flex align-items-center" href="login.html">
+          <img
+            src="assets/images/logo_teste.png"
+            alt="kbDoc" style="height: 32px;" class="me-2">
+          <span class="fw-bold">nome do site</span>
+          <!-- mudar depois-->
+        </a>
+        <ul class="navbar-nav ms-auto">
+          <li class="nav-item"><a class="nav-link" href="login.html">Página inicial</a></li>
+          <li class="nav-item"><a class="nav-link" href="#">Documentação</a></li>
+          <li class="nav-item">
+            <a href="login.html" class="btn btn-outline-primary">Entrar</a>
+          </li>
+        </ul>
+      </div>
+    </nav>
+  </header>
+
+  <!-- Conteúdo principal -->
+  <main class="d-flex align-items-center justify-content-center vh-100">
+    <div class="card shadow-lg p-4" style="max-width: 400px; width: 100%;">
+      <h3 class="text-center mb-4">Cadastro</h3>
+      <form id="registerForm">
+        <div class="mb-3">
+          <label for="name" class="form-label">Nome completo</label>
+          <input type="text" class="form-control" id="name" placeholder="Digite seu nome" required>
+        </div>
+        <div class="mb-3">
+          <label for="email" class="form-label">E-mail</label>
+          <input type="email" class="form-control" id="email" placeholder="Digite seu e-mail" required>
+        </div>
+        <div class="mb-3">
+          <label for="password" class="form-label">Senha</label>
+          <input type="password" class="form-control" id="password" placeholder="Crie uma senha" required>
+        </div>
+        <div class="mb-3">
+          <label for="confirmPassword" class="form-label">Confirmar Senha</label>
+          <input type="password" class="form-control" id="confirmPassword" placeholder="Repita a senha" required>
+        </div>
+        <div class="d-grid">
+          <button type="submit" class="btn btn-dark">Cadastrar</button>
+        </div>
+        <p class="text-center mt-3 mb-0">
+          Já tem conta? <a href="login.html">Entrar</a>
+        </p>
+      </form>
+    </div>
+  </main>
+
+  <!-- Scripts -->
+  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
+  <script src="assets/js/main.js"></script>
+</body>
+
+</html>