/* General */
html {
  font-size: 62.5%;
}
body {
  background: #f2f2f2;
  color: #514d47;
  font: normal 400 15px/25px "Gotham A", "Gotham B", Gotham, Helvetica, Arial, sans-serif;
  letter-spacing: .025rem;
}
a {
  color: #72abbf;
  text-decoration: none;
}
img {
  border: none;
}
hr {
  background: #f2f2f2;
  border: 0;
  height: 1px;
  margin: 30px 0;
}
strong,
h1,
h2,
h3,
th {
  font-weight: 500;
}
h1 {
  font-size: 2rem;
  margin-top: 0;
}
h2 {
  font-size: 1.75rem;
  margin: 3rem 0 1rem;
}
h3 {
  color: #555;
  font-size: 1.5rem;
  margin: 3rem 0 1rem;
}
ol {
  list-style-type: upper-roman;
}
ol ol {
  list-style-type: upper-alpha;
}
nav ul {
  list-style-type: none;
  margin: 0;
  padding-left: 0;
}
nav li {
  display: inline-block;
}
table {
  width: 100%;
}
th,
td {
  padding: 0 2rem 2rem 0;
  text-align: left;
  vertical-align: top;
}
td:last-of-type {
  padding-right: 0;
}
input,
select,
textarea {
  background: #f2f2f2;
  border: 1px solid #ccc;
  border-radius: 0;
  font-family: "Gotham A", "Gotham B";
  font-size: 1.25rem;
  outline: none;
  padding: 0 .5rem;
}
input:focus,
select:focus,
textarea:focus {
  border-color: #72abbf;
}
input[type="checkbox"],
input[type="radio"],
select {
  cursor: pointer;
}

/* Shared */
.left {
  float: left;
}
.right {
  float: right;
}
.clear {
  clear: both;
}
.container {
  margin: 0 auto;
  max-width: 96rem;
}
.button {
  background: #e5e5e5;
  color: inherit;
  display: inline-block;
  padding: .5rem 2rem;
}

/* Header */
.top-nav {
  height: 2rem;
  margin: 3rem 0;
}
.logo {
  background: url("../img/logo.svg") no-repeat;
  background-size: 30px 30px;
  display: block;
  height: 3rem;
  margin-top: -.5rem;
  width: 3rem;
}
.top-nav ul {
  font-size: 1.05rem;
  text-transform: uppercase;
}
.top-nav li{
  padding: 0 1rem;
}
.top-nav li:last-child {
  padding-right: 0;
}
.top-nav a {
  color: #807e7a;
}
.main-nav {
  background: #403f3d;
  height: 5rem;
  font-size: 1.25rem;
}
.main-nav li {
  line-height: 5rem;
}
.main-nav a {
  color: #fff;
  padding: 0 3rem;
}

/* Content */
.main-content {
  background: #fff;
}
.hero-image {
  width: 100%;
}
.video-embed {
  height: 0;
  margin-bottom: 10px;
  overflow: hidden;
  padding-bottom: 53.8%;
  position: relative;
}
.video-embed embed,
.video-embed iframe,
.video-embed object,
.video-embed video {
  height: 100%;
  left: 0;
  position: absolute;
  top: 0;
  width: 100%;
}
.text-content {
  margin: 0 auto;
  max-width: 700px;
  padding: 3rem;
}

/* Mobile */
.mobile-feature-copy {
  box-sizing: border-box;
  color: #fff;
  padding: 3rem 12rem;
  width: 65%;
}
.mobile-feature-copy ul {
  padding-left: 1.75rem;
}
.mobile-feature-image {
  margin-top: 3rem;
  width: 35%;
}
.ios .mobile-feature-copy,
.e-book .mobile-feature-copy {
  padding: 3rem 6rem;
  width: 50%;
}
.ios .mobile-feature-image,
.e-book .mobile-feature-image {
  width: 50%;
}
.ios .mobile-feature-image,
.android .mobile-feature-image,
.e-book .mobile-feature-image {
  margin-bottom: 3rem;
}
.ios .mobile-feature-copy,
.android .mobile-feature-copy,
.e-book .mobile-feature-copy {
  color: #514d47;
}
.elegant-design {
  background: url("../img/elegant-design-hero.png");
}
.study-tools {
  background: url("../img/study-tools-hero.png");
}
.free-resources {
  background: url("../img/free-resources-hero.png");
}

/* About */
.about-sidebar {
  width: 35%;
}
.about-content {
  width: 65%;
}
.about-content-full {
  margin: 0 auto;
  padding: 5rem;
  max-width: 65rem;
}
.about-sidebar,
.about-content {
  box-sizing: border-box;
  padding: 3rem;
}
.about-sidebar h2:first-of-type {
  margin-top: 0;
}
.about-sidebar h2 a {
  color: #514d47;
}
.about-sidebar h3 {
  margin-top: 1rem;
}
.about-sidebar h3 a {
  color: #807e7a;
}
.pt {
  font-size: 13px;
  line-height: 23px;
  margin-top: 3rem;
}
.pt th {
  padding-bottom: 0;
}
.pt td {
  padding-left: 1.5rem
}

/* Footer */
.main-footer {
  font-size: 1.05rem;
  height: 5rem;
  text-align: center;
  text-transform: uppercase;
}

/* Responsive */
@media all and (max-width: 959px) {
  .top-nav {
    margin: 3rem;
  }
}
@media all and (max-width: 850px) {
  .mobile-feature-image {
    display: none;
  }
  .mobile-feature-copy,
  .ios .mobile-feature-copy,
  .e-book .mobile-feature-copy {
    padding: 3rem;
    width: 100%;
  }
}
@media all and (max-width: 767px) {
  .main-nav a {
    padding: 0 .75rem;
  }
  .main-nav ul li:first-of-type {
    margin-left: 2.5rem;
  }
  .about-sidebar,
  .about-content {
    float: none;
    width: 100%;
  }
}