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

body {
  margin: 0;
  font-family: 'Noto Sans JP', sans-serif;
  line-height: 1.6; }

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

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

section {
  padding: 7rem 0; }

.container {
  width: 85%;
  max-width: 65rem;
  margin: 0 auto; }

.split {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center; }
  .split > * {
    flex-basis: 30%;
    min-width: 15rem; }

.spacing > * + * {
  margin-top: var(--spacer, 2rem); }

.btn {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  font-weight: 700;
  text-transform: uppercase;
  text-decoration: none;
  font-size: 1.125rem;
  color: var(--clr-text, #fff);
  background: var(--clr-accent, blue);
  border-radius: 0.25rem;
  transition: transform 250ms ease-in-out, opacity 250ms linear; }

.btn:hover,
.btn:focus {
  transform: scale(1.1);
  opacity: 0.9; }

.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 {
  color: white;
  text-align: center;
  padding: 15rem 0;
  background: #222; }
  @supports (background-blend-mode: multiply) {
    .hero {
      background: url(../img/shoe-3.png), radial-gradient(#444, #111);
      background-blend-mode: multiply;
      background-attachment: fixed;
      background-repeat: no-repeat;
      background-position: center center; } }

.featured {
  background: #eee; }
  .featured__item {
    display: block;
    position: relative;
    transform: scale(0.85);
    transition: transform 250ms ease-in-out;
    text-decoration: none;
    color: #333333;
    text-align: center; }
    .featured__item:hover, .featured__item:focus {
      transform: scale(1); }
      .featured__item:hover .featured__details, .featured__item:focus .featured__details {
        opacity: 1;
        text-shadow: 0 0 2rem white; }
    .featured__item::after {
      content: ' ';
      position: absolute;
      top: 10%;
      left: 10%;
      padding: 75% 75% 0 0;
      border-radius: 50%;
      background: #2193b0;
      z-index: -1; }
  .featured__details {
    opacity: 0;
    transition: opacity 250ms linear; }
    .featured__details span {
      display: block;
      font-weight: 700;
      font-size: 2rem;
      line-height: 1.2; }

.product {
  background: radial-gradient(var(--clr-inner, limegreen), var(--clr-outer, purple));
  padding: 3rem;
  border-radius: 3rem;
  margin-bottom: 3rem;
  text-align: center; }
  .product__title {
    font-size: clamp(3rem, calc(5vw + 1rem), 5.5rem);
    text-transform: uppercase;
    line-height: 1;
    line-height: 1.1;
    color: #fff;
    text-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.2); }
  .product__image {
    margin: -5rem 0 0 0; }
  @media (min-width: 45em) {
    .product {
      text-align: left;
      margin-bottom: 9rem; }
      .product__title {
        margin: 0; }
      .product__image {
        float: right;
        width: 65%;
        shape-outside: url(../img/shoe-1.png);
        shape-margin: 1em;
        margin: 0 -5rem 0 0; }
      .product.shoe-left .product__image {
        float: left;
        shape-outside: url(../img/shoe-2.png);
        margin: 0 0 0 -5rem;
        shape-margin: 2rem; } }

.hero {
  --clr-accent: #faa700; }

.shoe-red {
  --clr-inner: #faa700;
  --clr-outer: #e48d00;
  --clr-accent: #a1173c; }

.shoe-white {
  --clr-inner: #fce4b3;
  --clr-outer: #eac886;
  --clr-accent: #2f4858; }

.shoe-blue {
  --clr-inner: #6dd5ed;
  --clr-outer: #2193b0;
  --clr-accent: #008951; }