:root {
  --color-primary: #3f51b5;
  --color-secondary: #c5cae9;
  --color-accent: #f6be15;
}

html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  position: relative;
  font-family: -apple-system, BlinkMacSystemFont, "Roboto", "Segoe UI", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  line-height: 1.15;
  text-align: center;
  background: var(--color-primary);
  color: var(--color-secondary);
}

h1 {
  font-size: 64px;
  margin: 15px 0;
}

h2 {
  font-size: 25px;
  margin: 0;
}

p {
  font-size: 18px;
}

.header a {
  color: inherit;
  text-decoration: none;
  font-weight: 900;
  letter-spacing: 1.2px;
  transition: .2s ease;
  display: inline-block;
  min-width: 0;
  padding: 0 4px;
}

.header a:hover {
  font-size: 1.25em;
  color: var(--color-primary);
  background: var(--color-secondary);
  border-radius: 18px;
  min-width: 85px;
}

.container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 15px;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-flow: row wrap;
  flex-flow: row wrap;
  justify-content: center;
}

.container-block {
  display: block;
  float: left;
  position: relative;
  margin: 15px;
  flex-basis: calc(25% - 30px);
  order: 3;
  border-radius: 4px;
}

.container-block>a {
  display: block;
  width: 100%;
  background:
    linear-gradient(rgba(51, 51, 51, 0.2),
    rgba(51, 51, 51, 0.7));
  transition: .15s ease-in;
  border-radius: 4px;
}

.container-block img {
  display: block;
  width: 100%;
  border-radius: 4px;
  mix-blend-mode: luminosity;
}

.container-block:hover>a {
  background:
    linear-gradient(rgba(0, 0, 0, 0),
    rgba(0, 0, 0, 0.5));
  transform: scale(1.1);
}

.description {
  position: absolute;
  bottom: 10px;
  left: 15px;
  padding: 1px 4px;
  border-radius: 1px;
  background: #000000;
  color: #fff;
  font-size: 12px;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: .5px;
  transition: .15s ease-in;
}

.container-block:hover .description {
  background: var(--color-accent);
  color: #333333;
}

.panel {
  width: 100%;
  height: 100%;
  border-radius: 4px;
  background: #333333;
  color: #ffffff;
}

.panel, .panel-icons, .panel-text {
  display: -webkit-flex;
  display: flex;
  -webkit-flex-flow: row wrap;
  flex-flow: row wrap;
  align-items: center;
  justify-content: center;
}

.panel-icons {
  flex-basis: 35%;
  border-radius: 6px;
}

.panel-icons a {
  display: block;
  flex-basis: calc(50% - 20px);
  margin: 10px;
  fill: #ffffff;
}

.panel:hover {
  background: #ffffff;
  color: #333333;
}

.panel:hover a {
  fill: #333333;
}

.icon:hover {
  fill: var(--color-primary);
}

.panel-text {
  flex-basis: calc(50% - 20px);
  margin: 20px;
  font-size: 18px;
  font-weight: 500;
  line-height: 26px;
}

@media (max-width: 1350px) {
  .container-block {
    flex-basis: calc(33% - 30px);
  }

  .container-special {
    order: 2;
  }

  .container-before {
    order: 1;
  }
}

@media (max-width: 1050px) {
  .container-block {
    flex-basis: calc(50% - 30px);
  }
}

@media (max-width: 650px) {
  h1 {
    font-size: 48px;
  }

  h2 {
    font-size: 18px;
  }

  p {
    font-size: 12px;
  }

  .container-block {
    flex-basis: calc(100% - 30px);
  }

  .container-special {
    order: 1;
  }

  .container-before {
    order: 2;
  }

  .panel {
    min-height: 300px;
  }
}

.header {
  margin: 3em auto;
  padding: 0 30px;
}