:root {
    --primary-color: #333;
    --secondary-color: #444;
    --overlay-color: rgba(0, 0, 0, 0.5);
  }

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

body {
    font-family: 'Catamaran', sans-serif;
    line-height: 1.6;
    color: #333;
    font-size: 1.1rem;
  }

h1, h2, h3, h4 {
    line-height: 1.3;
  }

a {
    color: #444;
    text-decoration: none;
  }

ul {
    list-style: none;
  }
  
img {
    width: 100%;
  }
  
.container {
    max-width: 1100px;
    margin: auto;
    overflow: hidden;
    padding: 0 2rem;
  }

.navbar {
    font-size: 1.2rem;
    padding-top: 0.3rem;
    padding-bottom: 0.3rem;
  }

.navbar .container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-gap: 2rem;
  }
  
.navbar .logo {
    font-size: 2rem;
  }

.navbar ul {
    justify-self: flex-end;
    display: flex;
    align-items: center;
    justify-content: center;
  }

.navbar a {
    padding: 0 1rem;
  }
  
.navbar a:hover {
    color: #000;
  }
  
/* showcase Section A */

.section-a {
    margin: 2rem 0;
  }
  
.section-a .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-gap: 3rem;
    align-items: center;
    justify-content: center;
  }
  
.section-a h1 {
    font-size: 4rem;
    color: var(--primary-color);
  }

.section-a p {
    margin: 1rem 0;
  }

  /* showcase Section B */

  .section-b {
    position: relative;
    background: url('https://www.aer.io/img/blog-images/make_book_audiobook_blog.jpg') no-repeat bottom center/cover;
    height: 600px;
  }

  .section-b-inner {
    color: #fff;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    margin: auto;
    max-width: 860px;
    padding: 5rem 0;
  }

  .section-b-inner h3 {
    font-size: 2rem;
  }
  
  .section-b-inner h2 {
    font-size: 5rem;
    margin-top: 1rem;
  }
  
  .section-b-inner p {
    margin-top: 1rem;
    font-size: 1.5rem;
  }

/* footer */

.section-footer {
    background: var(--primary-color);
    color: #fff;
    padding: 4rem 0;
  }
  
  .section-footer .container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 1rem;
  }
  
  .section-footer h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
  }
  
  .section-footer h3 {
    margin-bottom: 0.7rem;
  }
  
  .section-footer a {
    line-height: 1.9;
    color: #ccc;
  }
  
  .section-footer a > i {
    color: #555;
    margin-right: 0.5rem;
  }
  
  .email-form {
    width: 100%;
    display: inline-block;
    background-color: #555;
    position: relative;
    border-radius: 20px;
    line-height: 0;
    margin-top: 1rem;
  }
  
  /* // .form-control-wrap {
  // 	position: relative;
  // 	display: inline-block;
  // 	width: 100%;
  // } */
  
  .email-form .form-control {
    display: inline-block;
    border: 0;
    outline: 0;
    font-size: 1rem;
    color: #ddd;
    background-color: transparent;
    font-family: inherit;
    margin: 0;
    padding: 0 3rem 0 1.5rem;
    width: 100%;
    height: 45px;
    border-radius: 20px;
  }
  
  .email-form .submit {
    display: inline-block;
    position: absolute;
    top: 0;
    right: 0;
    width: 45px;
    height: 45px;
    background-color: #eee;
    font-size: 1rem;
    text-align: center;
    margin: 0;
    padding: 0;
    outline: 0;
    border: 0;
    color: #333;
    cursor: pointer;
    border-radius: 0 20px 20px 0;
  }
  

/* Utilities  */
.btn {
    display: inline-block;
    background: var(--primary-color);
    color: #fff;
    padding: 0.8rem 1.5rem;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    border-radius: 30px;
  }
  
.btn:hover {
    background: var(--secondary-color);
  }

.overlay {
    height: 100%;
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-color: var(--overlay-color);
  }

  @media (max-width: 500px) {

    .navbar .logo{
      font-size: 1.3rem;
    }
    .section-a .container {
      grid-template-columns: 1fr;
      text-align: center;
    }
  
    .section-a .container div:first-child {
      order: 2;
    }
  
    .section-a .container div:nth-child(2) {
      order: -1;
    }
  
    .section-a img {
      width: 80%;
      margin: auto;
    }
    
    .section-b-inner h2 {
      font-size: 3.5rem;
    }
  
    .section-footer {
      padding: 2rem 0;
    }
    .section-footer .container {
      grid-template-columns: 1fr;
      text-align: center;
    }
    
  }