*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Franklin Gothic Medium", "Arial Narrow", Arial, sans-serif;
  line-height: 1.6;
}

img {
  max-width: 100%;
  display: block;
}

h1,
h2,
h3,
p {
  margin: 0;
}

section {
  padding: 2em 0;
}
.container {
  width: 85%;
  margin: 0 auto;
  max-width: 65em;
}

/* use it anywhere */

.split {
  display: flex;
  flex-wrap: wrap;
  gap: 1em;
  justify-content: center;
}

.split > * {
  flex-basis: 30%;
  min-width: 15em;
}
/* till here */

/* direct childern inside of it */
.spacing > * + * {
  margin-top: var(--spacer, 2rem);
}

.btn {
  display: inline-block;
  text-decoration: none;
  padding: 0.5em 1.25em;
  background: var(--clr-accent, blue);
  color: var(--clr-text, white);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 1.125rem;
  border-radius: 0.3em;
  transition: transform 250ms ease-in-out, opacity 250ms linear;
}

.btn:hover,
.btn:focus {
  transform: scale(1.1);
  opacity: 0.5;
}

.primary-title {
  font-size: 4rem;
  font-size: clamp(3rem, calc(5vw + 1rem), 4.5rem);
  line-height: 1;
  text-transform: uppercase;
}

.section-title {
  text-align: center;
  font-size: clamp(2.5rem, calc(5vw + 1rem), 4rem);
  line-height: 1;
  color: #17353d;
  margin-bottom: 5rem;
}

.hero {
  text-align: center;
  padding: 15em 0;
  color: #fff;
}

@supports (background-blend-mode: multiply) {
  .hero {
    background-image: url(img/shoe.jpg), radial-gradient(#444, #111);
    background-blend-mode: multiply;
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-position: center center;
  }
}

.featured {
  background: #fff;
}

.featured_item {
  transform: scale(0.85);
  display: block;
  position: relative;
  transition: transform 250ms ease-in-out;
  text-decoration: none;
  color: #444;
  text-align: center;
  line-height: 1.2;
}

.featured_item:hover,
.featured_item:focus {
  transform: scale(1);
}

.featured_item::after {
  content: " ";
  position: absolute;
  top: 0;
  left: 14%;
  z-index: -1;
  padding: 75% 75% 0 0;
  background: #54cfee;
  border-radius: 50%;
}

.featured_details {
  opacity: 0;
}

.featured_details:hover {
  opacity: 1;
  transition: opacity 250ms linear;
}

.featured_details span {
  display: block;
  font-weight: 700;
  font-size: 2rem;
}

.product {
  background: radial-gradient(
    var(--clr-inner, limegreen),
    var(--clr-outer, purple)
  );
  padding: 3em;
  border-radius: 1em;
  text-align: center;
  margin-bottom: 3em;
}

.product_title {
  font-size: 4rem;
  color: #fff;
  text-shadow: 0 0 0.2rem rgba(#000, 0.2);
  line-height: 1.1;
  font-size: clamp(3rem, calc(5vw +1rem, 5.5em));
}

.hero {
  --clr-accent: #faa700;
}
.shoe-black {
  --clr-inner: #faa700;
  --clr-outer: #e48d00;
  --clr-accent: #a1173c;
}
.shoe-white {
  --clr-inner: #f5e4c3;
  --clr-outer: #ad9462;
  --clr-accent: #1d3d52;
}
.shoe-blue {
  --clr-inner: #85e0f7;
  --clr-outer: #2193b0;
  --clr-accent: #008951;
}