/* General Styles */
body {
  background-image: linear-gradient(#fec8d8, #ffdfd3);
  line-height: 1;
  width: 700px;
  margin: 0 auto;
  background-color: #fafafa;
  font-family: 'Source Sans Pro', sans-serif;
  color: #111;
}

html {
  box-sizing: border-box;
  user-select: none;
}

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

/* Reset Styles */
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
  display: block;
}

ol,
ul {
  list-style: none;
}

blockquote,
q {
  quotes: none;
}

blockquote::before,
blockquote::after,
q::before,
q::after {
  content: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* Typography */
b {
  font-weight: bold;
}

/* Container */
.container {
  margin: 2% auto;
  padding: 15px;
  background-color: #fff;
  box-shadow: 0 1px 4px 0 rgba(0, 0, 0, 0.2);
}

/* Headings */
h1 {
  font-size: 3rem;
  font-weight: 900;
  text-align: center;
  margin: 1% 0 3%;
}

/* Textarea */
textarea {
  width: 100%;
  height: 250px;
  padding: 10px;
  border: 1px solid #d9d9d9;
  outline: none;
  font-size: 1rem;
  resize: none;
  line-height: 1.5rem;
  transition: border-color 0.3s;
}

textarea:hover {
  border-color: #c0c0c0;
}

textarea:focus {
  border-color: #4d90fe;
}

/* Output Row */
.output.row {
  width: 100%;
  border: 1px solid #ddd;
  font-size: 1.4rem;
  margin: 1% 0;
  background-color: #f9f9f9;
  display: flex;
  flex-wrap: wrap;
}

.output.row div {
  flex: 1 1 42%;
  padding: 10px 15px;
  margin: 1%;
}

.output.row span {
  font-weight: bold;
  font-size: 1.5rem;
}

/* Readability */
#readability {
  width: 52%;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.3s, color 0.3s;
}

#readability:hover {
  background-color: #4d90fe;
  color: #fff;
  border-radius: 2px;
}

#readability:active {
  background-color: #307af3;
}

/* Keywords */
.keywords {
  display: none;
  margin: 4% 0 0;
  font-size: 2rem;
  font-weight: 900;
}

.keywords ul {
  font-weight: 400;
  border: 1px solid #ddd;
  font-size: 1.4rem;
  background-color: #f9f9f9;
  margin: 2% 0;
}

.keywords li {
  display: inline-block;
  width: 44%;
  padding: 10px;
  margin: 1%;
}

/* Responsive Design */
@media (max-width: 750px) {
  body {
    width: 600px;
  }

  .output.row {
    font-size: 1.2rem;
  }

  .output.row span {
    font-size: 1.3rem;
  }

  .keywords ul {
    font-size: 1.2rem;
  }
}

@media (max-width: 600px) {
  body {
    width: 95%;
  }

  .output.row {
    border: none;
    background-color: #fff;
  }

  .output.row div {
    flex: 1 1 100%;
    padding: 10px 15px;
    margin: 2% auto;
    border: 1px solid #ddd;
    font-size: 1.8rem;
    background-color: #f9f9f9;
  }

  .output.row span {
    font-size: 2rem;
  }

  #readability {
    width: 100%;
    font-size: 1.6rem;
    font-weight: 400;
  }

  .keywords {
    margin: 10% auto;
  }

  .keywords ul {
    font-weight: 400;
    border: none;
    font-size: 1.8rem;
    background-color: #f9f9f9;
    margin: 5% 0;
  }

  .keywords li {
    flex: 1 1 100%;
    padding: 10px;
    margin: 2% auto;
    border: 1px solid #ddd;
  }
}