:root {
  --primary: #001655;
  --secondary: #df2316;
  --bluish-white: #f6f6ff;
  --gray90: #e5e5e5;
  --grey60: #999;
  --xlarge: 10em;
  --large: 6em;
  --medium: 3rem;
  --small: 1rem;
  --tiny: 0.5rem;
  --fast: 0.3s;
  --shadow-spreaded: 0px 0px 20px;
  --shadow-shrinked: 0px 0px 5px;
}

html,
body {
  padding: 0;
  margin: 0;
  height: 100%;
  font-family: "Roboto Mono", monospace;
  font-size: small;
  scroll-behavior: smooth;
  color: var(--primary);
  background-color: #ffffff;
}

header {
  display: flex;
  position: fixed;
  align-items: center;
  padding: 0 5%;
  height: var(--large);
  top: 0;
  left: 0;
  right: 0;
  background-color: #fff;
  box-shadow: var(--shadow-spreaded) var(--gray90);
  z-index: 1;
}

#header-img {
  width: 300px;
  max-width: 100%;
}

header div {
  flex-grow: 1.5;
}

nav {
  flex-grow: 1;
}

ul {
  list-style: none;
  margin-block-start: 0;
  margin-block-end: 0;
  margin-inline-start: 0px;
  margin-inline-end: 0px;
  padding-inline-start: 0;
}

header ul {
  display: flex;
  justify-content: space-between;
}

.nav-link {
  padding: var(--small);
  cursor: pointer;
  color: var(--grey60);
  text-decoration: none;
  transition-duration: var(--fast);
  border-radius: var(--tiny);
}

main {
  margin: auto;
}

section {
  text-align: center;
  padding: var(--large) var(--medium) var(--medium) var(--medium);
  margin-top: var(--small);
}

section:nth-child(even) {
  background-color: var(--bluish-white);
}

.container {
  max-width: 960px;
  margin: auto;
}

.iframe-resizer {
  max-width: 600px;
  margin: auto;
}

.responsive-iframe {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
}

iframe {
  border-radius: var(--small);
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  position: absolute;
}

h1 {
  font-size: var(--medium);
  color: var(--primary);
}

form {
  display: flex;
  flex-flow: row wrap;
}

input,
button {
  font-family: "Roboto Mono", monospace;
  border-radius: var(--tiny);
  border-style: unset;
  margin: var(--tiny);
  padding: var(--small);
  color: var(--primary);
}

input::placeholder {
  color: var(--grey60);
}

#email {
  border: 1px solid #e5e5e5;
}

input {
  background-color: var(--bluish-white);
  flex-grow: 2;
}

#submit,
button {
  flex-grow: 1;
  font-weight: bold;
  text-transform: uppercase;
  text-decoration: none;
  color: #fff;
  cursor: pointer;
  background-color: var(--secondary);
  transition-duration: var(--fast);
}

h2 {
  color: var(--secondary);
  margin-top: var(--tiny);
  margin-bottom: var(--medium);
}

#features {
  color: #fff;
}

.features-wrapper,
.price-wrapper {
  display: flex;
  flex-flow: row;
  justify-content: space-between;
}

h1,
h2,
h3 {
  background: linear-gradient(45deg, var(--primary), var(--secondary));
  background-clip: text;
  font-weight: 700;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.feature-group,
.price-group {
  background-color: #fff;
  color: var(--primary);
  border-radius: var(--small);
  padding: var(--medium);
  width: 30%;
  transition-duration: var(--fast);
  box-sizing: border-box;
}

svg {
  width: var(--large);
  padding: var(--small);
}

.price-group {
  border: 2px solid var(--bluish-white);
  display: flex;
  flex-direction: column;
  padding: var(--small);
  padding-top: 0;
}

.price-group h3 {
  background-clip: text;
  font-weight: 300;
  padding: var(--small);
  border-radius: var(--tiny);
  -webkit-background-clip: unset;
  -webkit-text-fill-color: #fff;
}

.price {
  font-size: large;
  font-weight: 700;
  color: var(--secondary);
  border-radius: var(--small);
}

.price-group li {
  border-top: 1px solid #e5e5e5;
  line-height: var(--medium);
  padding: var(--tiny);
}

footer {
  padding: var(--small) 5%;
  display: flex;
  background: var(--primary);
  justify-content: space-between;
  color: var(--grey60);
}

footer p {
  margin-block-start: 0em;
  margin-block-end: 0em;
  margin-inline-start: 0px;
  margin-inline-end: 0px;
  padding: var(--tiny);
  flex-grow: 1.5;
}

footer ul {
  display: flex;
  flex-flow: row wrap;
  flex-grow: 1;
  justify-content: space-between;
}

footer a {
  color: var(--grey60);
}

@media only screen and (min-width: 1024px) {
  .nav-link:hover {
    background-color: var(--bluish-white);
  }

  .feature-group:hover,
  .price-group:hover {
    color: var(--secondary);
    transform: scale(1.1);
    box-shadow: var(--shadow-spreaded) #e5e5e5;
  }
  #submit:hover,
  #submit:focus,
  button:hover,
  button:focus {
    box-shadow: var(--shadow-spreaded) var(--secondary);
  }
  #submit,
  button {
    outline: none;
  }
  button::-moz-focus-inner,
  #submit::-moz-focus-inner {
    border: none;
  }
  #submit:active,
  button:active {
    box-shadow: var(--shadow-shrinked) var(--secondary);
  }

  footer a:hover {
    color: var(--bluish-white);
  }
}

@media only screen and (max-width: 768px) {
  header {
    display: flex;
    flex-direction: column;
    height: var(--large);
    align-items: stretch;
    justify-content: center;
  }
  header div {
    margin: 0 auto;
    flex-grow: 0;
  }
  #header-img {
    max-width: 100%;
    width: 200px;
  }
  header nav {
    justify-content: space-between;
    margin: 0;
    flex-grow: 0;
  }
  .features-wrapper,
  .price-wrapper {
    display: flex;
    flex-flow: column;
    align-content: space-between;
  }
  .feature-group,
  .price-group {
    padding: var(--small);
    width: 100%;
    margin-bottom: var(--medium);
  }
  .feature-group {
    display: flex;
    flex-direction: row;
    text-align: left;
  }
  .feature-group svg {
    width: var(--xlarge);
    margin-right: var(--small);
  }
  .feature-group h3,
  p {
    margin: var(--tiny);
  }
  .feature-group:last-child,
  .price-group:last-child {
    margin-bottom: 0;
  }
  footer {
    flex-direction: column;
    align-items: center;
  }
}

@media only screen and (max-width: 320px) {
  header {
    display: flex;
    flex-flow: column;
    align-items: center;
    height: var(--xlarge);
  }
  header ul {
    display: flex;
    flex-flow: column;
    text-align: center;
  }
  header nav li {
    padding: var(--tiny);
  }
  section {
    padding: var(--xlarge) var(--small) var(--small) var(--small);
    margin-top: var(--small);
  }
  .feature-group {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .feature-group svg {
    width: var(--large);
  }
  footer p {
    text-align: center;
  }
  footer ul {
    flex-direction: column;
    align-items: center;
  }
}