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HTML

              
                <div id="app" :data-state="current.value.wake">
  <div class="buttons">
    <div class="button vol-up"></div>
    <div class="button vol-down"></div>
    <div class="button silence"></div>
    <div class="button sleep" @click="sleepWake"></div>
  </div>
  
  <div class="screen">
    <div class="login">
      <h1 class="brand">BRAND</h1>
      <form @submit.prevent="send">
        <div class="input-group">
          <input id="email" name="email" type="text" placeholder="ANYTHING" v-model="form.email">
        </div>

        <div class="input-group">
          <input id="password" name="password" type="password" placeholder="PASSWORD" v-model="form.password">
        </div>

        <div class="error">
          That's not right.<br>I literally gave you the password!
        </div>
        <input type="submit" value="SUBMIT">
      </form>

      <div class="legal">
        <p>* Don't use your bank password.</p>
        <p>(We didn't spend much on security for this app.)</p>
      </div>
    </div>
    <div class="logged-in">
      <h1 class="brand">BRAND</h1>
      <main>
        <div class="avatar">
          <img src='https://s3-us-west-2.amazonaws.com/s.cdpn.io/1116884/IMG_2973.JPG' alt=''>
        </div>
        
        <div class="greeting">
          WELCOME!
          <p>that's it...</p>
          <p>that's the entire application</p>
        </div>
        <button @click="signout">LOGOUT</button>
      </main>
    </div>
    <div class="loading">
      <h1 class="brand">BRAND</h1>
      <div class="spinner-1"></div>
      <div class="spinner-2"></div>
    </div>
  </div>
</div>
<div class="message">your password is hotdogs</div>

              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Gruppo|Alegreya+Sans:300|Alegreya+Sans+SC:100&display=swap');

html {
  box-sizing: border-box;
}

*, *:before, *:after {
  position: relative;
  box-sizing: inherit;
}

html, body {
  height: 100%;
}

body {
  --transition: opacity 150ms ease-in-out;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: linear-gradient(#5F64B7, #8E93E6);
  color: white;
}

input,
button {
  cursor: none;
  
  &:focus {
    outline: none;
  }
}

#app {
  position: relative;
  height: 100vh;
  width: 100vw;
  padding: 0;
  margin-bottom: 2vmin;
  display: flex;
  background: #ccc;
  font-size: 2.5vmin;

  
  @media screen and (min-width: 400px) {
    height: 90vmin;
    width: 50vmin;
    padding: 1.5vmin;
    border-radius: 3.5vmin;
    box-shadow: 
      inset 6px -6px 6px rgba(black, 0.25),
      inset -4px 4px 8px rgba(white, 0.9), 
      -4px 4px 20px rgba(black, 0.26);
  }
 
  
  &[data-state="idle"],
  &[data-state="fail"] {
    .screen::after {
      opacity: 1;
    }

    .login {
      opacity: 1;
    }
  }
  
  &[data-state="fail"] {
    .error {
      display: inline;
    }
  }
  
  &[data-state="success"] {
    .screen::after {
      opacity: 1;
    }

    .logged-in {
      opacity: 1;
      pointer-events: all;
    }
  }
  
  &[data-state="loading"] {
    .screen::after {
      opacity: 1;
    }

    .loading {
      opacity: 1;
      pointer-events: all;
    }
  }
}

.buttons {
  position: absolute;
  width: 100%;
  height: 100%;
}

.button {
  position: absolute;
  width: 0.8vmin;
  background-color: #ccc;
  box-shadow: inset 0 2px 4px rgba(white, 0.5);
  cursor: pointer;
  
  &:active {
    background-color: #ddd;
    width: 0.4vmin;
  }
}

.vol-up, .vol-down, .silence {
  height: 6vmin;
  left: -2.2vmin;
  border-radius: 0.2rem 1px 1px 0.2rem;
  box-shadow: 
    inset 0 2px 4px rgba(white, 0.5),
    inset -2px 0 4px rgba(black, 0.35);
  
  &:active {
    border-radius: 0.4vmin 0 0 0.4vmin;
    left: -1.8vmin;
  }
}

.silence {
  top: 9vmin;
  height: 6vmin;
}

.vol-up {
  top: 22vmin;
}

.vol-down {
  top: 30vmin;
}

.sleep {
  top: 12vmin;
  right: 0.8vmin;
  height: 12vmin;
  border-radius: 1px 0.2rem 0.2rem 1px;

  &:active {
    right: 1.1vmin;
    border-radius: 0 0.4vmin 0.4vmin 0;
  }
}

.screen {
  position: relative;
  height: 100%;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background-color: black;

  overflow: hidden;
  
  @media screen and (min-width: 400px) {
    border-radius: 2.5vmin;
    box-shadow: 0 0 3px 3px rgba(white, 0.6),
    0 -2px 8px rgba(white, 0.1);
  }
  
  &:after {
    position: absolute;
    content: '';
    bottom: 5px;
    left: 50%;
    height: 3px;
    width: 20vmin;
    // max-width: 110px;
    border-radius: 3px;
    background-color: #6067B2;
    transform: translateX(-50%);
    opacity: 0;
  }
}

.brand {
  margin: 0;
  text-align: center;
  opacity: 0.8;
  font-size: 36px;
  font-family: 'Gruppo', cursive;
  letter-spacing: 6px;
  user-select: none;
}

/* LOGIN SCREEN
============================ */

.login {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  padding: 1rem;
  padding-bottom: 5vmin;
  background: linear-gradient(#43427B, #272754);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  opacity: 0;
}

.login .brand {
  font-size: 6vmin;
  color: white;
}

.login form {
  display: flex;
  flex-direction: column;
}

.login form .input-group {
  margin-bottom: 5vmin;
  opacity: 0.5;
  transition: var(--transition);
  
  &::before {
    position: absolute;
    bottom: 0;
    left: 0;
    content: '';
    background-color: rgba(255, 255, 255, 0.5);
    height: 1px;
    width: 100%; 
  }
  
  &::after {
    position: absolute;
    bottom: 0;
    left: 0;
    content: '';
    background-color: white;
    height: 1px;
    width: 0;
    transition: width 300ms cubic-bezier(0.5, 0, 0.5, 1);
  }
  
  &:focus-within {
    opacity: 1;
    
    &::after {
      width: 100%;
    }
  }
}

.login form .input-group input {
  padding-left: 5%;
  font-family: 'Alegreya Sans', sans-serif;
}

.login form .input-group input::placeholder {
  font-family: 'Alegreya Sans SC', sans-serif;
  font-size: 2.5vmin;
  color: white;
}

.login form .input-group input[type="password"] {
  letter-spacing: 4px;
}

.login form .input-group input[type="password"]::placeholder {
  letter-spacing: 0;
}

.login form .input-group input[type="text"],
.login form .input-group input[type="password"] {
  width: 100%;
  font-size: 20px;
  background-color: transparent;
  border: none;
  color: white;
  
  &:focus {
    outline: none;
  }
}

.login form .error {
  text-align: center;
  font-size: 2vmin;
  margin-bottom: 1.6rem;
  color: red;
  display: none;
}

.login form input[type="submit"] {
  padding: 2.3vmin 6.5vmin;
  line-height: 1;
  align-self: center;
  justify-self: center;
  background-color: transparent;
  border-radius: 1vmin;
  border: 1px solid white;
  font-size: 3vmin;
  color: white;
  font-family: 'Alegreya Sans', sans-serif;
  opacity: 0.5;
  transition: var(--transition);
  
  &:hover {
    opacity: 1;
  }
}

.login .legal {
  text-align: center;
  font-size: 0.4rem;
  opacity: 0.4;
  font-family: 'Alegreya Sans', sans-serif;
  user-select: none;
}

.login .legal p {
  margin: 0;
}

/* LOGGED IN SCREEN
============================ */

.logged-in {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  padding: 2vmin;
  padding-bottom: 4vmin;
  background: linear-gradient(#8E94E3, #272754);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  opacity: 0;
  pointer-events: none;
}

.logged-in .brand {
  font-size: 6vmin;
}

.logged-in main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.logged-in main .avatar {
  height: 25vmin;
  width: 25vmin;
  border-radius: 50%;
  padding: 1vmin;
  margin-bottom: 1vmin;
  overflow: hidden;
  border: 0.4vmin solid white;
}

.logged-in main .avatar img {
  height: 100%;
  width: 100%;
  border-radius: 50%;
}

.logged-in main .greeting {
    font-family: 'Alegreya Sans', sans-serif;
  font-size: 6vmin;
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  text-align: center;
}

.logged-in main .greeting p {
  margin: 0;
  font-size: 2.5vmin;
  opacity: 0.5;
}

.logged-in main button {
  padding: 1.3vmin 2vmin 1vmin 2vmin;
  margin: 0.8rem 0;
  background: transparent;
  font-family: 'Alegreya Sans', sans-serif;
  font-size: 3vmin;
  color: white;
  border: 0.2vmin solid white;
  border-radius: 1vmin;
  opacity: 0.5;
  
  &:active,
  &:hover {
    opacity: 1;
  }
}

/* LOADING SCREEN
============================ */

.loading {
  position: absolute;
  height: 100%;
  width: 100%;
  padding: 2vmin;
  top: 0;
  left: 0;
  background-color: rgba(white, 1);
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}

.loading .brand {
  font-size: 6vmin;
  color: #272754;
}

.loading .spinner-1,
.loading .spinner-2 {
  position: absolute;
  top: 50%;
  left: 50%;
  height: 90px;
  width: 90px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transform-origin: center center;
  background-color: #272754;
  opacity: 0.2;
  animation: loader 1000ms ease-in-out alternate infinite;
}

.loading .spinner-1 {
  opacity: 0.2;
}

.loading .spinner-2 {
  opacity: 0.4;
  animation-direction: alternate-reverse;
}

.message {
  font-family: 'Alegreya Sans', sans-serif;
  opacity: 0.4;
}

@keyframes loader {
  to {
    height: 40px;
    width: 40px;
  }
}

/* TOUCH
============================ */

:root {
  --mouse-x: calc(50vw + 1px);
  --mouse-y: calc(50vh + 1px);
  cursor: none;
}

.mouse-tracker {
  position: fixed;
  display: none;
  top: 0;
  left: 0;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  border: 2px solid white;
  opacity: 0.8;
  z-index: 999;
  transform: 
    translate(-50%, -50%)
    translate(
      var(--mouse-x),
      var(--mouse-y)
    )
    scale( calc( 1 - (var(--mouse-down) * 0.2)) );
  pointer-events: none;
  transition: transform 100ms ease;
 
  @media screen and (min-width: 576px) {
    display: inline;
  }
}
              
            
!

JS

              
                const authenticate = data => new Promise((resolve, reject) => {
  setTimeout(() => {
    if(data.password === 'hotdogs') {
     resolve('awesome data') 
    } else {
      reject('oh crap')
    }
  }, 3000) 
});

const machine = XState.Machine(
  {
    id: 'login',
    initial: 'wake',
    context: {
      email: null,
      password: null
    },
    states: {
      wake: {
        initial: 'idle',
        states: {
          idle: {
            entry: 'clearContext',
            on: {
              SUBMIT: [
                {
                  target: 'loading',
                  cond: 'validateForm',
                  actions: [
                    XState.assign({ 
                      email: (_, event) => event.email,
                      password: (_, event) => event.password
                    }),
                  ],
                },
                { target: 'fail' },
              ],
            },
          },
          loading: {
             invoke: {
              id: 'authenticate',
              src: context => authenticate(context),
              onDone: {
                target: 'success'
              },
              onError: {
                target: 'fail'
              },
            },
          },
          fail: {
            on: {
              SUBMIT: [
                {
                  target: 'loading',
                  cond: (ctx, event) => event.email && event.password !== '',
                  actions: [
                    XState.assign({ 
                      email: (ctx, event) => event.email,
                      password: (ctx, event) => event.password
                    }),
                  ],
                },
                { target: 'fail' },
              ],
            },
          },
          success: {
            on: {
              SIGNOUT: 'idle'
            }
          },
          hist: {
            type: 'history',
            target: 'idle'
          },
        },
        on: {
          POWER: 'sleep'
        }
      },
      sleep: {
        on: {
          POWER: 'wake.hist'
        }
      }
    }
  },
  {
    actions: {
      clearContext: XState.assign({
        email: null,
        password: null
      })
  },
    guards: {
      validateForm: (ctx, event) => event.email !== '' && event.password !== ''
  }
  }
)

new Vue({
  el: '#app',
  data() {
    return {
      loginService: XState.interpret(machine),
      current: machine.initialState,
      form: {
        email: '',
        password: ''
      }
    }
  },
  created() {
    this.loginService
      .onTransition(state => {
        this.current = state;
      })
      .start();
  },
  destroyed() {
    this.loginService.stop();
  },
  methods: {
    send() {
      this.loginService.send('SUBMIT', this.form);
    },
    signout() {
      this.form.email = '';
      this.form.password = '';
      this.loginService.send('SIGNOUT');
    },
    sleepWake() {
        this.form.email = '';
        this.form.password = '';
        this.loginService.send('POWER');

    }
  }
});

// touch
document.body.insertAdjacentHTML('beforeend', '<div class="mouse-tracker"></div>');

document.addEventListener('mousemove', event => {
  document.documentElement.style.setProperty('--mouse-x', `${event.clientX}px`);
  document.documentElement.style.setProperty('--mouse-y', `${event.clientY}px`);
})

document.addEventListener('mousedown', event => {
  document.documentElement.style.setProperty('--mouse-down', 1);
})

document.addEventListener('mouseup', event => {
  document.documentElement.style.setProperty('--mouse-down', 0);
})
              
            
!
999px

Console