@keyframes change-color {
  to {
    color: var(--black-tint-14);
    stroke: var(--black-tint-14);
  }
}

@keyframes change-span-color {
  to {
    background-color: var(--black-tint-14);
  }
}

@keyframes change-bg-color {
  to {
    background-color: var(--white);
  }
}

@keyframes change-margin {
  to {
    margin-inline: var(--sp-16);
  }
}

@keyframes header-shrink {
  to {
    top: var(--sp-12);
    width: var(--sp-950);
    border-radius: var(--sp-4);
    background-color: var(--white);
    box-shadow: 0px 0px 28px 0px rgba(0, 0, 0, 0.1);
  }
}

.floating-hand {
  --header-height: var(--sp-96);
  position: fixed;
  top: var(--header-height);
  left: 50%;
  transform: translateX(-50%);
  max-width: var(--sp-447);
  opacity: 0.2;
  z-index: -2;
}

.page-home header-sticky-wrapper {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: transparent;
}

header-sticky-wrapper {
  display: block;
  position: sticky;
  top: 0;
  z-index: 1;
  background-color: var(--white);
}

.main-header nav {
  a {
    text-decoration: none;
    color: var(--black-tint-14);
    text-wrap: nowrap;

    &:has(svg) {
      width: fit-content;
      display: grid;
      grid-template-columns: 1fr var(--sp-16);
      align-items: center;
      gap: var(--sp-4);

      svg {
        transition: transform var(--anime-time) var(--anime-func);
      }

      @media (hover: hover) {
        &:hover {
          .right-arrow-16 {
            transform: translateX(var(--sp-2));
          }
        }
      }
    }
  }
}

@media only screen and (width > 60.625rem) {
  .mo-show,
  .burger-menu {
    display: none;
  }

  .page-home header-sticky-wrapper {
    left: 50%;
    transform: translateX(-50%);

    nav {
      >ul {
        >li {
          >a {
            color: var(--white);

            svg path {
              stroke: var(--white);

              animation: change-color linear forwards;
              animation-timeline: scroll(root);
              animation-range: 0% 10%;
            }
          }
        }
      }
    }
  }

  header-sticky-wrapper {
    margin-inline: auto;

    animation: header-shrink linear forwards;
    animation-timeline: scroll(root);
    animation-range: 0% 10%;

    header-inner {
      display: flex;
      flex-wrap: wrap;
      flex-direction: row;
      justify-content: space-between;
      align-items: center;
      margin-inline: var(--sp-30-16);
      padding-block: var(--sp-16);

      animation: change-margin linear forwards;
      animation-timeline: scroll(root);
      animation-range: 0% 10%;
    }

    nav {
      >ul {
        display: flex;
        flex-direction: row;
        gap: var(--sp-20);

        >li {
          >a {
            color: var(--black-tint-14);

            animation: change-color linear forwards;
            animation-timeline: scroll(root);
            animation-range: 0% 10%;

            svg {
              path {
                stroke: var(--black-tint-14);
              }
            }
          }

          @media (hover: hover) {
            &:hover {
              .header-down-arrow {
                transform: rotate(180deg);
              }
            }
          }

          &:has(ul) {
            position: relative;

            ul {
              display: none;
              flex-direction: column;
              gap: var(--sp-20);
              position: absolute;
              top: calc(100% + var(--sp-4));
              left: 0;
              padding: var(--sp-20);
              background-color: var(--white);
              border-block-start: var(--sp-1) solid var(--main);
              box-shadow: 0px 2px 4px 0px rgba(0, 0, 0, 0.12);
              transform: translateY(calc(-1 * var(--sp-12)));
              opacity: 0;
              transition: 
                display var(--anime-time) var(--anime-func) allow-discrete,
                transform var(--anime-time) var(--anime-func),
                opacity var(--anime-time) var(--anime-func);

              &::before {
                content: "";
                position: absolute;
                top: calc(-1 * var(--sp-4));
                left: 0;
                width: 100%;
                height: var(--sp-4);
                background-color: transparent;
              }

              li:not(:first-child) {
                margin-inline-start: var(--sp-8);
              }
            }

            @media (hover: hover) {
              &:hover {
                ul {
                  display: flex;
                  transform: translateY(0);
                  opacity: 1;

                  @starting-style {
                    transform: translateY(calc(-1 * var(--sp-12)));
                    opacity: 0;
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

@media only screen and (width <= 60.625rem) {
  .main-header {
    .mo-show {
      display: inline-block;
    }

    .mo-hide {
      display: none;
    }

    nav {
      a:has(svg) {
        display: block;
        text-wrap: wrap;

        svg {
          display: inline-block;
          vertical-align: middle;
          margin-inline-start: var(--sp-4);
        }
      }
    }
  }

  .burger-menu {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: var(--sp-24);
    height: var(--sp-24);
    gap: var(--sp-4);
    background-color: transparent;
    border: none;

    span {
      display: block;
      width: var(--sp-16);
      height: var(--sp-1);
      background-color: var(--black-tint-14);
      transition: 
        transform var(--anime-time) var(--anime-func),
        background-color var(--anime-time) var(--anime-func);
    }
  }

  .page-home header-sticky-wrapper {
    animation: change-bg-color linear forwards;
    animation-timeline: scroll(root);
    animation-range: 0% 10%;

    .burger-menu {
      span {
        background-color: var(--white);

        animation: change-span-color linear forwards;
        animation-timeline: scroll(root);
        animation-range: 0% 10%;
      }
    }

    .menu-open {
      .burger-menu {
        span {
          background-color: var(--black-tint-14);
        }
      }
    }
  }

  .menu-open {
    .burger-menu {
      span {
        background-color: var(--black-tint-14);

        &:nth-of-type(1) {
          transform: translateY(var(--sp-2));
        }

        &:nth-of-type(2) {
          transform: translateY(calc(-1 * var(--sp-2)));
        }
      }
    }
  }

  header-sticky-wrapper {
    position: sticky;
    transition: background-color var(--anime-time) var(--anime-func);
    top: 0;

    &:has(.menu-open) {
      background-color: var(--white);

      nav {
        transform: translateX(0);
        background-color: var(--white);
      }
    }

    header-inner {
      display: flex;
      flex-direction: row;
      justify-content: space-between;
      align-items: center;
      margin-inline: var(--sp-20);
      padding-block: var(--sp-16);
      position: relative;

      >.btn-filled {
        display: none;
      }

      nav {
        position: fixed;
        top: var(--sp-72);
        left: 0;
        background-color: transparent;
        width: 100%;
        height: calc(100dvh - var(--sp-72));
        overflow-y: scroll;
        padding-inline: var(--sp-20);
        padding-block: var(--sp-24);
        transform: translateX(100%);
        transition: 
          transform var(--anime-time) var(--anime-func),
          background-color var(--anime-time) var(--anime-func);

        >ul {
          display: flex;
          flex-direction: column;
          gap: var(--sp-24);

          ul {
            display: flex;
            flex-direction: column;
            gap: var(--sp-24);
            margin-inline-start: var(--sp-8);
          }
        }
      }
    }
  }
}