:root {
  --color-red: hsl(0, 78%, 62%);
  --color-cyan: hsl(180, 62%, 55%);
  --color-orange: hsl(34, 97%, 64%);
  --color-blue: hsl(212, 86%, 64%);
  --color-grey-500: hsl(234, 12%, 34%);
  --color-grey-400: hsl(212, 6%, 44%);
  --color-white: hsl(0, 0%, 100%);
}

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

body {
  font-family: 'Poppins', sans-serif;
  font-size: 15px;
  background-color: #fafafa;
  color: var(--color-grey-500);
  line-height: 1.6;
}

.container {
  max-width: 375px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.header {
  text-align: center;
  margin-bottom: 4rem;
}

.header__title {
  font-weight: 200;
  font-size: 1.5rem;
  color: var(--color-grey-400);
  margin-bottom: 0.5rem;
}

.header__subtitle {
  font-weight: 600;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.header__text {
  color: var(--color-grey-400);
  max-width: 500px;
  margin: 0 auto;
}

.cards {
  display: grid;
  gap: 1.5rem;
}

.card {
  background-color: var(--color-white);
  padding: 1.5rem;
  border-radius: 0.5rem;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
}

.card--supervisor::before {
  background-color: var(--color-cyan);
}

.card--team-builder::before {
  background-color: var(--color-red);
}

.card--karma::before {
  background-color: var(--color-orange);
}

.card--calculator::before {
  background-color: var(--color-blue);
}

.card__title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.card__text {
  color: var(--color-grey-400);
  font-size: 0.875rem;
  margin-bottom: 2rem;
}

.card__icon {
  display: block;
  margin-left: auto;
}

.attribution {
  font-size: 11px;
  text-align: center;
  padding: 1rem;
}

.attribution a {
  color: hsl(228, 45%, 44%);
}

@media screen and (min-width: 1440px) {
  .container {
    max-width: 1440px;
    padding: 5rem 10rem;
  }

  .header__title,
  .header__subtitle {
    font-size: 2.5rem;
  }

  .header__text {
    font-size: 1rem;
  }

  .cards {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
  }

  .card--supervisor {
    grid-column: 1;
    grid-row: 2 / 4;
  }

  .card--team-builder {
    grid-column: 2;
    grid-row: 1 / 3;
  }

  .card--karma {
    grid-column: 2;
    grid-row: 3 / 5;
  }

  .card--calculator {
    grid-column: 3;
    grid-row: 2 / 4;
  }
}