:root {
    --timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    --animation-duration: 250ms;
  }
  
  html {
    box-sizing: border-box;
  }
  
  *,
  *::before,
  *::after {
    box-sizing: inherit;
  }
  
  body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
      Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    background-color: #fff;
    color: #212121;
  }
  
  .gallery {
    display: grid;
    width: 1200px;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    grid-auto-rows: 240px;
    grid-gap: 12px;
    padding: 0;
    list-style: none;
    margin-left: auto;
    margin-right: auto;
  }
  
  .gallery__item {
    position: relative;
    box-shadow: 0px 1px 3px 0px rgba(0, 0, 0, 0.2),
      0px 1px 1px 0px rgba(0, 0, 0, 0.14), 0px 2px 1px -1px rgba(0, 0, 0, 0.12);
  }
  
  .gallery__image:hover {
    transform: scale(1.03);
  }
  
  .gallery__image {
    height: 100%;
    width: 100%;
    object-fit: cover;
    transition: transform var(--animation-duration) var(--timing-function);
  }
  
  .gallery__link {
    display: block;
    text-decoration: none;
    height: 100%;
  }
  
  .gallery__link:hover {
    cursor: zoom-in;
  }
  
  /* Lightbox */
  .lightbox {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--animation-duration) var(--timing-function);
  }
  
  .lightbox.is-open {
    opacity: 1;
    pointer-events: initial;
  }
  
  .lightbox__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.8);
  }
  
  .lightbox__content {
    transform: scale(0.95);
    transition: transform var(--animation-duration) var(--timing-function);
  }
  
  .lightbox.is-open .lightbox__content {
    transform: scale(1);
  }
  
  .lightbox__image {
    display: block;
    width: auto;
    height: auto;
    max-height: 100vh;
    max-width: 100vw;
  }
  
  .lightbox__button {
    position: absolute;
    top: 8px;
    right: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    padding: 0;
    margin: 0;
    border: none;
    border-radius: 50%;
    background-color: transparent;
    color: #fff;
    cursor: pointer;
    transition: background-color var(--animation-duration) var(--timing-function);
    outline: none;
    background-image: url('../images/icon-close.svg');
    background-position: center;
    background-size: 60%;
    background-repeat: no-repeat;
  }
  
  .lightbox__button:hover,
  .lightbox__button:focus {
    background-color: rgba(0, 0, 0, 0.5);
  }