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代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>用户注册 - 智能家居生态系统</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Segoe UI", sans-serif;
        }

        body {
            background-color: #f0f2f5;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
            background-image: radial-gradient(circle 800px at 10% 20%, rgba(59, 130, 246, 0.08), transparent 60%),
                              radial-gradient(circle 700px at 90% 80%, rgba(14, 165, 233, 0.08), transparent 60%);
        }

        /* 全新卡片样式 */
        .register-card {
            width: 100%;
            max-width: 720px;
            background: #fff;
            border-radius: 20px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            overflow: hidden;
            border: 1px solid rgba(0,0,0,0.05);
        }

        /* 顶部标题栏 */
        .card-header {
            background: linear-gradient(90deg, #0ea5e9, #3b82f6);
            padding: 28px 24px;
            text-align: center;
            color: white;
        }

        .card-header h2 {
            font-weight: 600;
            font-size: 24px;
            margin-bottom: 6px;
        }

        .card-header p {
            opacity: 0.9;
            font-size: 14px;
        }

        /* 表单区域 */
        .card-body {
            padding: 36px 40px;
        }

        /* 表单项样式 */
        .form-item {
            margin-bottom: 26px;
        }

        .form-item label {
            display: block;
            margin-bottom: 10px;
            font-weight: 500;
            color: #333;
            font-size: 15px;
        }

        .form-control {
            height: 48px;
            border-radius: 10px;
            border: 1px solid #dcdfe6;
            padding: 0 16px;
            font-size: 15px;
            transition: all 0.25s ease;
        }

        .form-control:focus {
            border-color: #0ea5e9;
            box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
            outline: none;
        }

        /* 提示文字 */
        .form-tip {
            margin-top: 6px;
            font-size: 13px;
            min-height: 18px;
        }

        .tip-error {
            color: #f43f5e;
        }

        .tip-success {
            color: #10b981;
        }

        /* 按钮 */
        .btn-submit {
            width: 100%;
            height: 50px;
            border-radius: 10px;
            background: linear-gradient(90deg, #0ea5e9, #3b82f6);
            color: white;
            font-weight: 500;
            font-size: 16px;
            border: none;
            transition: all 0.25s ease;
            margin-top: 10px;
        }

        .btn-submit:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(14, 165, 233, 0.25);
            color: white;
        }

        /* 移动端适配 */
        @media (max-width: 576px) {
            .card-body {
                padding: 28px 24px;
            }
        }
    </style>
</head>
<body>

<div class="register-card">
    <!-- 顶部标题 -->
    <div class="card-header">
        <h2>账号注册</h2>
       
    </div>

    <!-- 表单区域 -->
    <div class="card-body">
        <form id="registerForm">
            <!-- 用户名 -->
            <div class="form-item">
                <label>用户名</label>
                <input type="text" class="form-control" id="username" placeholder="请输入3-20位用户名">
                <div class="form-tip" id="usernameTip"></div>
            </div>

            <!-- 密码 -->
            <div class="form-item">
                <label>登录密码</label>
                <input type="password" class="form-control" id="password" placeholder="请输入至少6位密码">
                <div class="form-tip" id="passwordTip"></div>
            </div>

            <!-- 确认密码 -->
            <div class="form-item">
                <label>确认密码</label>
                <input type="password" class="form-control" id="confirmPwd" placeholder="请再次输入密码">
                <div class="form-tip" id="confirmTip"></div>
            </div>

            <!-- 注册按钮 -->
            <button type="submit" class="btn-submit">立即注册</button>
        </form>
    </div>
</div>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
<script>
    // 获取元素
    const username = document.getElementById('username');
    const password = document.getElementById('password');
    const confirmPwd = document.getElementById('confirmPwd');
    const form = document.getElementById('registerForm');

    // 提示元素
    const usernameTip = document.getElementById('usernameTip');
    const passwordTip = document.getElementById('passwordTip');
    const confirmTip = document.getElementById('confirmTip');

    // 验证状态
    let uOk = false, pOk = false, cOk = false;

    // 用户名验证
    function checkName() {
        const val = username.value.trim();
        if (!val) {
            usernameTip.className = 'form-tip tip-error';
            usernameTip.textContent = '用户名不能为空';
            uOk = false;
        } else if (val.length < 3 || val.length > 20) {
            usernameTip.className = 'form-tip tip-error';
            usernameTip.textContent = '长度必须在3-20位之间';
            uOk = false;
        } else {
            usernameTip.className = 'form-tip tip-success';
            usernameTip.textContent = '用户名可用';
            uOk = true;
        }
    }

    // 密码验证
    function checkPwd() {
        const val = password.value;
        if (!val) {
            passwordTip.className = 'form-tip tip-error';
            passwordTip.textContent = '密码不能为空';
            pOk = false;
        } else if (val.length < 6) {
            passwordTip.className = 'form-tip tip-error';
            passwordTip.textContent = '密码长度至少6位';
            pOk = false;
        } else {
            passwordTip.className = 'form-tip tip-success';
            passwordTip.textContent = '密码格式正确';
            pOk = true;
        }
        checkConfirm();
    }

    // 确认密码
    function checkConfirm() {
        const pwd = password.value;
        const cpwd = confirmPwd.value;
        if (!cpwd) {
            confirmTip.className = 'form-tip tip-error';
            confirmTip.textContent = '请确认密码';
            cOk = false;
        } else if (pwd !== cpwd) {
            confirmTip.className = 'form-tip tip-error';
            confirmTip.textContent = '两次输入密码不一致';
            cOk = false;
        } else {
            confirmTip.className = 'form-tip tip-success';
            confirmTip.textContent = '密码一致';
            cOk = true;
        }
    }

    // 实时监听
    username.addEventListener('input', checkName);
    password.addEventListener('input', checkPwd);
    confirmPwd.addEventListener('input', checkConfirm);

    // 提交
    form.addEventListener('submit', e => {
        e.preventDefault();
        checkName();
        checkPwd();
        checkConfirm();

        if (uOk && pOk && cOk) {
            alert('注册信息验证成功！');
            // 这里可以继续写提交接口逻辑
        }
    });
</script>

</body>
</html>