:root{
  --color-cyan-600: hsla(192, 37%, 48%, 1);
  --color-cyan-300: hsla(192, 90%, 77%, 1);
  --color-purple-600: hsla(268, 34%, 53%, 1);
  --color-purple-300: hsla(268, 100%, 86%, 1);
  --color-slate-900: hsla(240, 21%, 20%, 1);
  --color-slate-600: hsla(240, 10%, 57%, 1);
  --color-slate-300: hsla(240, 18%, 85%, 1);
  --color-white: hsla(0, 0%, 98%, 1);
  
  --font-size-xxxxl: 4rem;      /* 64px */
  --font-size-xxxl: 3rem;      /* 48px */
  --font-size-xxl: 2.5rem;     /* 40px */
  --font-size-xl: 2.25rem;     /* 36px */
  --font-size-lg: 2rem;       /* 32px */
  --font-size-md: 1.125rem;   /* 18px */
  --font-size-sm: 1rem;       /* 16px */
  --font-size-xs: 0.875rem;   /* 14px */
  --font-size-xxs: 0.75rem;   /* 12px */
  
  --spacing-1400: 7rem;       /* 112px */
  --spacing-1000: 5rem;       /* 80px */
  --spacing-900: 4.5rem;      /* 72px */
  --spacing-800: 4rem;        /* 64px */
  --spacing-700: 3.5rem;      /* 56px */
  --spacing-600: 3rem;        /* 48px */
  --spacing-500: 2.5rem;      /* 40px */
  --spacing-400: 2rem;        /* 32px */
  --spacing-300: 1.5rem;      /* 24px */
  --spacing-200: 1rem;        /* 16px */
  --spacing-100: 0.5rem;      /* 8px */
  --spacing-50: 0.25rem;      /* 4px */
}

.landing-page{
  font-family: 'Red Hat Display', sans-serif;
}

/*---------- .nav class---------*/
.nav{
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-1000);
}

/*---------- .landing class---------*/
.landing-hero{
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-600);
  overflow-x: hidden;
}

.landing-hero__left-image{
  display: none;
}

.landing-hero__right-image{
  display: none;
}

.landing-hero__combined-image{
  margin-top: var(--spacing-800);
  /*object-fit: cover;*/
}

.landing-hero__body{
  margin: 0 var(--spacing-400) var(--spacing-400);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-300);
  align-items: center;
  text-align: center;
  max-width: 28rem;
}

.landing-hero__title{
  font-size: var(--font-size-xxl);
  line-height: 1.1;
  font-weight: 900;
}

.landing-hero__description{
  font-size: var(--font-size-sm);
  line-height: 1.5;
  font-weight: 500;
  color: var(--color-slate-600);
}

.landing-hero__buttons{
  display: flex;
  flex-direction: column;
  gap: var(--spacing-200);
}

/*---------- .btn ----------*/
.btn{
  text-decoration: none;
  padding: var(--spacing-200) var(--spacing-500);
  background-color: var(--color-purple-600);
  color: var(--color-white);
  
  /*TODO: change to rem*/
  border-radius: 50px;
  
  
  font-size: var(--font-size-sm);
  line-height: 1.5;
  font-weight: 900;
  white-space: nowrap;
}

.btn:first-child{
  background-color: var(--color-cyan-600);
}

.btn__download-first{
  color: var(--color-cyan-300);
}

.btn:hover .btn__download-first {
  color: var(--color-cyan-600);
}

.btn__download-second{
  color: var(--color-purple-300);
}

.btn:hover .btn__download-second {
  color: var(--color-purple-600);
}

.btn:hover{
  background-color: var(--color-cyan-300);
}

.landing-hero__info-btn:hover{
  background-color: var(--color-purple-300);
}

.page-footer__btn:hover{
  background-color: var(--color-purple-300);
}

.btn__download-first:hover{
  color: var(--color-cyan-600);
}

/*---------- .num ----------*/
.num{
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  z-index: 2;
  
  font-size: var(--font-size-sm);
  line-height: 1.5;
  font-weight: 900;
  color: var(--color-slate-600);
}

.num__line{
  height: 5rem;
  width: 0.063rem;
  background-color: var(--color-slate-300);
}

.num__circle{
  height: 3.5rem;
  width: 3.5rem;
  
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--color-white);
  
  border: 0.063rem solid var(--color-slate-300);
  border-radius: 50%;
}

.second-num{
  margin-bottom: -1.75rem;
}

/*---------- main ----------*/
.features{
  display: flex;
  align-items: center;
  flex-direction: column;
  gap: var(--spacing-800);
  
  margin: var(--spacing-400) var(--spacing-400) var(--spacing-800);
}

.features__gallery{
  display: grid;
  gap: var(--spacing-200);
  grid-template-columns: repeat(2, 1fr);
  max-width: 28rem;
}

.features__image{
  border-radius: 0.5rem;
}

.features__info{
  display: flex;
  flex-direction: column;
  text-align: center;
  max-width: 31.5rem;
}

.features__subheading{
  margin-bottom: var(--spacing-200);
  font-size: var(--font-size-xxs);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: 0.25rem;
  text-transform: uppercase;
  color: var(--color-cyan-600);
}

.features__title{
  margin-bottom: var(--spacing-400);
  font-size: var(--font-size-lg);
  line-height: 1.1;
  font-weight: 900;
}

.features__description{
  font-size: var(--font-size-sm);
  line-height: 1.5;
  font-weight: 500;
  color: var(--color-slate-600);
}

/*---------- footer ----------*/
.page-footer{
  
  position: relative;
  isolation: isolate;
  
  background-image: url("../images/mobile/image-footer.jpg");
  background-size: cover;
  background-blend-mode: multiply;
  background-repeat: no-repeat;
}

.page-footer::after{
  content: "";
  position: absolute;
  background-color: var(--color-cyan-600);
  inset: 0;
  z-index: -1;
  opacity: 0.9;
}

.page-footer__content{
  display: flex;
  flex-direction: column;
  gap: var(--spacing-300);
  align-items: center;
  
  
  padding: var(--spacing-800) var(--spacing-400);
  color: var(--color-white);
  text-align: center;
}

.page-footer__title{
  font-size: var(--font-size-lg);
  line-height: 1.1;
  font-weight: 900;
  max-width: 31.5rem;
}

.page-footer__description{
  font-size: var(--font-size-sm);
  line-height: 1.5;
  font-weight: 500;
  max-width: 31.5rem;
}

@media (min-width: 48rem) {
  .landing-hero{
    gap: var(--spacing-900);
  }
  
  .landing-hero__body{
    margin-bottom: var(--spacing-800);
  }
  
  .landing-hero__title{
    font-size: var(--font-size-xxxl);
  }
  
  .landing-hero__buttons{
    flex-direction: row;
  }
  
  .features{
    margin-top: var(--spacing-700);
  }
  
  .features__gallery{
    grid-template-columns: repeat(4, 1fr);
    max-width: none;
  }
  
  .features__subheading{
    font-size: var(--font-size-sm);
  }
  
  .features__title{
    font-size: var(--font-size-xl);
  }
  
  .features__info{
  }
  
  .page-footer__title{
    font-size: var(--font-size-xl);
  }
  
  .page-footer{
    background-image: url("../images/tablet/image-footer.jpg");
  }
}

@media (min-width: 70.25rem) {
  .landing-hero{
    flex-direction: row;
    gap: var(--spacing-400);
    margin: var(--spacing-800) 0;
  }
  
  .landing-hero__left-image {
    display: block;
    right: 5%;
  }
  
  .landing-hero__body{
    margin: 0;
  }
  
  .landing-hero__right-image {
    display: block;
    order: 1;
  }
  
  .landing-hero__combined-image{
    display: none;
  }
  
  .features{
    max-width: 70rem;
    margin: 0 auto;
    padding-top: var(--spacing-700);
    padding-bottom: var(--spacing-700);
  }
  
  .page-footer{
    background-image: url("../images/desktop/image-footer.jpg");
  }
  
  .page-footer__content{
    text-align: left;
    flex-direction: row;
    align-items: flex-start;
    gap: var(--spacing-400);
    max-width: 70rem;
    margin: 0 auto;
    padding: var(--spacing-1400) var(--spacing-1000);
  }
  
  .page-footer__description{
    font-size: var(--font-size-md);
  }
}