phanpy/src/pages/welcome.css

@keyframes shine2 {
  0% {
    left: -100%;
  }
  20% {
    left: 100%;
  }
  100% {
    left: 100%;
  }
}

#welcome {
  text-align: center;
  background-image: radial-gradient(
      circle at center,
      var(--bg-color),
      transparent 16em
    ),
    radial-gradient(circle at center, var(--bg-color), transparent 8em);
  background-repeat: no-repeat;
  background-attachment: fixed;
  cursor: default;

  @media (prefers-color-scheme: dark) {
    background-image: none;
  }

  .hero-container {
    padding: 16px;
    height: 100vh;
    height: 100svh;
    max-height: 800px;
    display: flex;
    flex-direction: column;
  }

  h1 {
    margin: 0;
    padding: 0;
    font-size: 5em;
    line-height: 1;
    letter-spacing: -1px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    mix-blend-mode: multiply;

    @media (prefers-color-scheme: dark) {
      mix-blend-mode: normal;
    }

    &:before {
      content: '';
      position: absolute;
      z-index: 2;
      width: 100%;
      height: 100%;
      background-image: linear-gradient(
        100deg,
        rgba(255, 255, 255, 0) 30%,
        rgba(255, 255, 255, 0.4),
        rgba(255, 255, 255, 0) 70%
      );
      top: 0;
      left: -100%;
      pointer-events: none;
      animation: shine2 5s ease-in-out 1s infinite;

      @media (prefers-color-scheme: dark) {
        content: none;
      }
    }

    img {
      filter: drop-shadow(-1px -1px var(--bg-blur-color))
        drop-shadow(0 -1px 1px #fff)
        drop-shadow(0 16px 32px var(--drop-shadow-color));

      @media (prefers-color-scheme: dark) {
        filter: none;
      }
    }

    &:hover img {
      transform: scale(1.05);
    }
  }

  img {
    vertical-align: top;
    transition: transform 0.3s ease-out;
  }

  .desc {
    font-size: 1.4em;
    text-wrap: balance;
    opacity: 0.7;
  }

  .hero-container > p {
    margin-top: 0;
  }

  #why-container {
    padding: 0 16px;
  }

  .sections {
    padding-inline: 16px;

    section {
      text-align: start;
      max-width: 480px;
      background-color: var(--bg-color);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 17px 20px 40px var(--drop-shadow-color);
      margin-bottom: 48px;

      h4 {
        margin: 0;
        padding: 30px 30px 0;
        font-size: 1.4em;
        font-weight: 600;
      }

      p {
        margin-inline: 30px;
        margin-bottom: 30px;
        opacity: 0.7;
        text-wrap: balance;
      }

      img {
        width: 100%;
        height: auto;
        border-bottom: 1px solid var(--outline-color);

        @media (prefers-color-scheme: dark) {
          filter: invert(0.85) hue-rotate(180deg);
        }
      }
    }
  }

  @media (width > 40em) {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr auto;
    height: 100vh;
    height: 100svh;

    .hero-container {
      height: auto;
    }

    #why-container {
      padding: 32px;
      overflow: auto;
      mask-image: linear-gradient(to top, transparent 16px, black 64px);
    }

    footer {
      grid-row: 2;
      grid-column: 1 / span 2;
    }
  }

  & ~ :is(#compose-button, #shortcuts) {
    display: none;
  }
}